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/wp-includes/ID3/ -> module.audio-video.matroska.php (source)

   1  <?php
   2  
   3  /////////////////////////////////////////////////////////////////
   4  /// getID3() by James Heinrich <info@getid3.org>               //
   5  //  available at https://github.com/JamesHeinrich/getID3       //
   6  //            or https://www.getid3.org                        //
   7  //            or http://getid3.sourceforge.net                 //
   8  //  see readme.txt for more details                            //
   9  /////////////////////////////////////////////////////////////////
  10  //                                                             //
  11  // module.audio-video.matriska.php                             //
  12  // module for analyzing Matroska containers                    //
  13  // dependencies: NONE                                          //
  14  //                                                            ///
  15  /////////////////////////////////////////////////////////////////
  16  
  17  
  18  define('EBML_ID_CHAPTERS',                  0x0043A770); // [10][43][A7][70] -- A system to define basic menus and partition data. For more detailed information, look at the Chapters Explanation.
  19  define('EBML_ID_SEEKHEAD',                  0x014D9B74); // [11][4D][9B][74] -- Contains the position of other level 1 elements.
  20  define('EBML_ID_TAGS',                      0x0254C367); // [12][54][C3][67] -- Element containing elements specific to Tracks/Chapters. A list of valid tags can be found <http://www.matroska.org/technical/specs/tagging/index.html>.
  21  define('EBML_ID_INFO',                      0x0549A966); // [15][49][A9][66] -- Contains miscellaneous general information and statistics on the file.
  22  define('EBML_ID_TRACKS',                    0x0654AE6B); // [16][54][AE][6B] -- A top-level block of information with many tracks described.
  23  define('EBML_ID_SEGMENT',                   0x08538067); // [18][53][80][67] -- This element contains all other top-level (level 1) elements. Typically a Matroska file is composed of 1 segment.
  24  define('EBML_ID_ATTACHMENTS',               0x0941A469); // [19][41][A4][69] -- Contain attached files.
  25  define('EBML_ID_EBML',                      0x0A45DFA3); // [1A][45][DF][A3] -- Set the EBML characteristics of the data to follow. Each EBML document has to start with this.
  26  define('EBML_ID_CUES',                      0x0C53BB6B); // [1C][53][BB][6B] -- A top-level element to speed seeking access. All entries are local to the segment.
  27  define('EBML_ID_CLUSTER',                   0x0F43B675); // [1F][43][B6][75] -- The lower level element containing the (monolithic) Block structure.
  28  define('EBML_ID_LANGUAGE',                    0x02B59C); //     [22][B5][9C] -- Specifies the language of the track in the Matroska languages form.
  29  define('EBML_ID_TRACKTIMECODESCALE',          0x03314F); //     [23][31][4F] -- The scale to apply on this track to work at normal speed in relation with other tracks (mostly used to adjust video speed when the audio length differs).
  30  define('EBML_ID_DEFAULTDURATION',             0x03E383); //     [23][E3][83] -- Number of nanoseconds (i.e. not scaled) per frame.
  31  define('EBML_ID_CODECNAME',                   0x058688); //     [25][86][88] -- A human-readable string specifying the codec.
  32  define('EBML_ID_CODECDOWNLOADURL',            0x06B240); //     [26][B2][40] -- A URL to download about the codec used.
  33  define('EBML_ID_TIMECODESCALE',               0x0AD7B1); //     [2A][D7][B1] -- Timecode scale in nanoseconds (1.000.000 means all timecodes in the segment are expressed in milliseconds).
  34  define('EBML_ID_COLOURSPACE',                 0x0EB524); //     [2E][B5][24] -- Same value as in AVI (32 bits).
  35  define('EBML_ID_GAMMAVALUE',                  0x0FB523); //     [2F][B5][23] -- Gamma Value.
  36  define('EBML_ID_CODECSETTINGS',               0x1A9697); //     [3A][96][97] -- A string describing the encoding setting used.
  37  define('EBML_ID_CODECINFOURL',                0x1B4040); //     [3B][40][40] -- A URL to find information about the codec used.
  38  define('EBML_ID_PREVFILENAME',                0x1C83AB); //     [3C][83][AB] -- An escaped filename corresponding to the previous segment.
  39  define('EBML_ID_PREVUID',                     0x1CB923); //     [3C][B9][23] -- A unique ID to identify the previous chained segment (128 bits).
  40  define('EBML_ID_NEXTFILENAME',                0x1E83BB); //     [3E][83][BB] -- An escaped filename corresponding to the next segment.
  41  define('EBML_ID_NEXTUID',                     0x1EB923); //     [3E][B9][23] -- A unique ID to identify the next chained segment (128 bits).
  42  define('EBML_ID_CONTENTCOMPALGO',               0x0254); //         [42][54] -- The compression algorithm used. Algorithms that have been specified so far are:
  43  define('EBML_ID_CONTENTCOMPSETTINGS',           0x0255); //         [42][55] -- Settings that might be needed by the decompressor. For Header Stripping (ContentCompAlgo=3), the bytes that were removed from the beggining of each frames of the track.
  44  define('EBML_ID_DOCTYPE',                       0x0282); //         [42][82] -- A string that describes the type of document that follows this EBML header ('matroska' in our case).
  45  define('EBML_ID_DOCTYPEREADVERSION',            0x0285); //         [42][85] -- The minimum DocType version an interpreter has to support to read this file.
  46  define('EBML_ID_EBMLVERSION',                   0x0286); //         [42][86] -- The version of EBML parser used to create the file.
  47  define('EBML_ID_DOCTYPEVERSION',                0x0287); //         [42][87] -- The version of DocType interpreter used to create the file.
  48  define('EBML_ID_EBMLMAXIDLENGTH',               0x02F2); //         [42][F2] -- The maximum length of the IDs you'll find in this file (4 or less in Matroska).
  49  define('EBML_ID_EBMLMAXSIZELENGTH',             0x02F3); //         [42][F3] -- The maximum length of the sizes you'll find in this file (8 or less in Matroska). This does not override the element size indicated at the beginning of an element. Elements that have an indicated size which is larger than what is allowed by EBMLMaxSizeLength shall be considered invalid.
  50  define('EBML_ID_EBMLREADVERSION',               0x02F7); //         [42][F7] -- The minimum EBML version a parser has to support to read this file.
  51  define('EBML_ID_CHAPLANGUAGE',                  0x037C); //         [43][7C] -- The languages corresponding to the string, in the bibliographic ISO-639-2 form.
  52  define('EBML_ID_CHAPCOUNTRY',                   0x037E); //         [43][7E] -- The countries corresponding to the string, same 2 octets as in Internet domains.
  53  define('EBML_ID_SEGMENTFAMILY',                 0x0444); //         [44][44] -- A randomly generated unique ID that all segments related to each other must use (128 bits).
  54  define('EBML_ID_DATEUTC',                       0x0461); //         [44][61] -- Date of the origin of timecode (value 0), i.e. production date.
  55  define('EBML_ID_TAGLANGUAGE',                   0x047A); //         [44][7A] -- Specifies the language of the tag specified, in the Matroska languages form.
  56  define('EBML_ID_TAGDEFAULT',                    0x0484); //         [44][84] -- Indication to know if this is the default/original language to use for the given tag.
  57  define('EBML_ID_TAGBINARY',                     0x0485); //         [44][85] -- The values of the Tag if it is binary. Note that this cannot be used in the same SimpleTag as TagString.
  58  define('EBML_ID_TAGSTRING',                     0x0487); //         [44][87] -- The value of the Tag.
  59  define('EBML_ID_DURATION',                      0x0489); //         [44][89] -- Duration of the segment (based on TimecodeScale).
  60  define('EBML_ID_CHAPPROCESSPRIVATE',            0x050D); //         [45][0D] -- Some optional data attached to the ChapProcessCodecID information. For ChapProcessCodecID = 1, it is the "DVD level" equivalent.
  61  define('EBML_ID_CHAPTERFLAGENABLED',            0x0598); //         [45][98] -- Specify wether the chapter is enabled. It can be enabled/disabled by a Control Track. When disabled, the movie should skip all the content between the TimeStart and TimeEnd of this chapter.
  62  define('EBML_ID_TAGNAME',                       0x05A3); //         [45][A3] -- The name of the Tag that is going to be stored.
  63  define('EBML_ID_EDITIONENTRY',                  0x05B9); //         [45][B9] -- Contains all information about a segment edition.
  64  define('EBML_ID_EDITIONUID',                    0x05BC); //         [45][BC] -- A unique ID to identify the edition. It's useful for tagging an edition.
  65  define('EBML_ID_EDITIONFLAGHIDDEN',             0x05BD); //         [45][BD] -- If an edition is hidden (1), it should not be available to the user interface (but still to Control Tracks).
  66  define('EBML_ID_EDITIONFLAGDEFAULT',            0x05DB); //         [45][DB] -- If a flag is set (1) the edition should be used as the default one.
  67  define('EBML_ID_EDITIONFLAGORDERED',            0x05DD); //         [45][DD] -- Specify if the chapters can be defined multiple times and the order to play them is enforced.
  68  define('EBML_ID_FILEDATA',                      0x065C); //         [46][5C] -- The data of the file.
  69  define('EBML_ID_FILEMIMETYPE',                  0x0660); //         [46][60] -- MIME type of the file.
  70  define('EBML_ID_FILENAME',                      0x066E); //         [46][6E] -- Filename of the attached file.
  71  define('EBML_ID_FILEREFERRAL',                  0x0675); //         [46][75] -- A binary value that a track/codec can refer to when the attachment is needed.
  72  define('EBML_ID_FILEDESCRIPTION',               0x067E); //         [46][7E] -- A human-friendly name for the attached file.
  73  define('EBML_ID_FILEUID',                       0x06AE); //         [46][AE] -- Unique ID representing the file, as random as possible.
  74  define('EBML_ID_CONTENTENCALGO',                0x07E1); //         [47][E1] -- The encryption algorithm used. The value '0' means that the contents have not been encrypted but only signed. Predefined values:
  75  define('EBML_ID_CONTENTENCKEYID',               0x07E2); //         [47][E2] -- For public key algorithms this is the ID of the public key the data was encrypted with.
  76  define('EBML_ID_CONTENTSIGNATURE',              0x07E3); //         [47][E3] -- A cryptographic signature of the contents.
  77  define('EBML_ID_CONTENTSIGKEYID',               0x07E4); //         [47][E4] -- This is the ID of the private key the data was signed with.
  78  define('EBML_ID_CONTENTSIGALGO',                0x07E5); //         [47][E5] -- The algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values:
  79  define('EBML_ID_CONTENTSIGHASHALGO',            0x07E6); //         [47][E6] -- The hash algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values:
  80  define('EBML_ID_MUXINGAPP',                     0x0D80); //         [4D][80] -- Muxing application or library ("libmatroska-0.4.3").
  81  define('EBML_ID_SEEK',                          0x0DBB); //         [4D][BB] -- Contains a single seek entry to an EBML element.
  82  define('EBML_ID_CONTENTENCODINGORDER',          0x1031); //         [50][31] -- Tells when this modification was used during encoding/muxing starting with 0 and counting upwards. The decoder/demuxer has to start with the highest order number it finds and work its way down. This value has to be unique over all ContentEncodingOrder elements in the segment.
  83  define('EBML_ID_CONTENTENCODINGSCOPE',          0x1032); //         [50][32] -- A bit field that describes which elements have been modified in this way. Values (big endian) can be OR'ed. Possible values:
  84  define('EBML_ID_CONTENTENCODINGTYPE',           0x1033); //         [50][33] -- A value describing what kind of transformation has been done. Possible values:
  85  define('EBML_ID_CONTENTCOMPRESSION',            0x1034); //         [50][34] -- Settings describing the compression used. Must be present if the value of ContentEncodingType is 0 and absent otherwise. Each block must be decompressable even if no previous block is available in order not to prevent seeking.
  86  define('EBML_ID_CONTENTENCRYPTION',             0x1035); //         [50][35] -- Settings describing the encryption used. Must be present if the value of ContentEncodingType is 1 and absent otherwise.
  87  define('EBML_ID_CUEREFNUMBER',                  0x135F); //         [53][5F] -- Number of the referenced Block of Track X in the specified Cluster.
  88  define('EBML_ID_NAME',                          0x136E); //         [53][6E] -- A human-readable track name.
  89  define('EBML_ID_CUEBLOCKNUMBER',                0x1378); //         [53][78] -- Number of the Block in the specified Cluster.
  90  define('EBML_ID_TRACKOFFSET',                   0x137F); //         [53][7F] -- A value to add to the Block's Timecode. This can be used to adjust the playback offset of a track.
  91  define('EBML_ID_SEEKID',                        0x13AB); //         [53][AB] -- The binary ID corresponding to the element name.
  92  define('EBML_ID_SEEKPOSITION',                  0x13AC); //         [53][AC] -- The position of the element in the segment in octets (0 = first level 1 element).
  93  define('EBML_ID_STEREOMODE',                    0x13B8); //         [53][B8] -- Stereo-3D video mode.
  94  define('EBML_ID_OLDSTEREOMODE',                 0x13B9); //         [53][B9] -- Bogus StereoMode value used in old versions of libmatroska. DO NOT USE. (0: mono, 1: right eye, 2: left eye, 3: both eyes).
  95  define('EBML_ID_PIXELCROPBOTTOM',               0x14AA); //         [54][AA] -- The number of video pixels to remove at the bottom of the image (for HDTV content).
  96  define('EBML_ID_DISPLAYWIDTH',                  0x14B0); //         [54][B0] -- Width of the video frames to display.
  97  define('EBML_ID_DISPLAYUNIT',                   0x14B2); //         [54][B2] -- Type of the unit for DisplayWidth/Height (0: pixels, 1: centimeters, 2: inches).
  98  define('EBML_ID_ASPECTRATIOTYPE',               0x14B3); //         [54][B3] -- Specify the possible modifications to the aspect ratio (0: free resizing, 1: keep aspect ratio, 2: fixed).
  99  define('EBML_ID_DISPLAYHEIGHT',                 0x14BA); //         [54][BA] -- Height of the video frames to display.
 100  define('EBML_ID_PIXELCROPTOP',                  0x14BB); //         [54][BB] -- The number of video pixels to remove at the top of the image.
 101  define('EBML_ID_PIXELCROPLEFT',                 0x14CC); //         [54][CC] -- The number of video pixels to remove on the left of the image.
 102  define('EBML_ID_PIXELCROPRIGHT',                0x14DD); //         [54][DD] -- The number of video pixels to remove on the right of the image.
 103  define('EBML_ID_FLAGFORCED',                    0x15AA); //         [55][AA] -- Set if that track MUST be used during playback. There can be many forced track for a kind (audio, video or subs), the player should select the one which language matches the user preference or the default + forced track. Overlay MAY happen between a forced and non-forced track of the same kind.
 104  define('EBML_ID_MAXBLOCKADDITIONID',            0x15EE); //         [55][EE] -- The maximum value of BlockAddID. A value 0 means there is no BlockAdditions for this track.
 105  define('EBML_ID_WRITINGAPP',                    0x1741); //         [57][41] -- Writing application ("mkvmerge-0.3.3").
 106  define('EBML_ID_CLUSTERSILENTTRACKS',           0x1854); //         [58][54] -- The list of tracks that are not used in that part of the stream. It is useful when using overlay tracks on seeking. Then you should decide what track to use.
 107  define('EBML_ID_CLUSTERSILENTTRACKNUMBER',      0x18D7); //         [58][D7] -- One of the track number that are not used from now on in the stream. It could change later if not specified as silent in a further Cluster.
 108  define('EBML_ID_ATTACHEDFILE',                  0x21A7); //         [61][A7] -- An attached file.
 109  define('EBML_ID_CONTENTENCODING',               0x2240); //         [62][40] -- Settings for one content encoding like compression or encryption.
 110  define('EBML_ID_BITDEPTH',                      0x2264); //         [62][64] -- Bits per sample, mostly used for PCM.
 111  define('EBML_ID_CODECPRIVATE',                  0x23A2); //         [63][A2] -- Private data only known to the codec.
 112  define('EBML_ID_TARGETS',                       0x23C0); //         [63][C0] -- Contain all UIDs where the specified meta data apply. It is void to describe everything in the segment.
 113  define('EBML_ID_CHAPTERPHYSICALEQUIV',          0x23C3); //         [63][C3] -- Specify the physical equivalent of this ChapterAtom like "DVD" (60) or "SIDE" (50), see complete list of values.
 114  define('EBML_ID_TAGCHAPTERUID',                 0x23C4); //         [63][C4] -- A unique ID to identify the Chapter(s) the tags belong to. If the value is 0 at this level, the tags apply to all chapters in the Segment.
 115  define('EBML_ID_TAGTRACKUID',                   0x23C5); //         [63][C5] -- A unique ID to identify the Track(s) the tags belong to. If the value is 0 at this level, the tags apply to all tracks in the Segment.
 116  define('EBML_ID_TAGATTACHMENTUID',              0x23C6); //         [63][C6] -- A unique ID to identify the Attachment(s) the tags belong to. If the value is 0 at this level, the tags apply to all the attachments in the Segment.
 117  define('EBML_ID_TAGEDITIONUID',                 0x23C9); //         [63][C9] -- A unique ID to identify the EditionEntry(s) the tags belong to. If the value is 0 at this level, the tags apply to all editions in the Segment.
 118  define('EBML_ID_TARGETTYPE',                    0x23CA); //         [63][CA] -- An informational string that can be used to display the logical level of the target like "ALBUM", "TRACK", "MOVIE", "CHAPTER", etc (see TargetType).
 119  define('EBML_ID_TRACKTRANSLATE',                0x2624); //         [66][24] -- The track identification for the given Chapter Codec.
 120  define('EBML_ID_TRACKTRANSLATETRACKID',         0x26A5); //         [66][A5] -- The binary value used to represent this track in the chapter codec data. The format depends on the ChapProcessCodecID used.
 121  define('EBML_ID_TRACKTRANSLATECODEC',           0x26BF); //         [66][BF] -- The chapter codec using this ID (0: Matroska Script, 1: DVD-menu).
 122  define('EBML_ID_TRACKTRANSLATEEDITIONUID',      0x26FC); //         [66][FC] -- Specify an edition UID on which this translation applies. When not specified, it means for all editions found in the segment.
 123  define('EBML_ID_SIMPLETAG',                     0x27C8); //         [67][C8] -- Contains general information about the target.
 124  define('EBML_ID_TARGETTYPEVALUE',               0x28CA); //         [68][CA] -- A number to indicate the logical level of the target (see TargetType).
 125  define('EBML_ID_CHAPPROCESSCOMMAND',            0x2911); //         [69][11] -- Contains all the commands associated to the Atom.
 126  define('EBML_ID_CHAPPROCESSTIME',               0x2922); //         [69][22] -- Defines when the process command should be handled (0: during the whole chapter, 1: before starting playback, 2: after playback of the chapter).
 127  define('EBML_ID_CHAPTERTRANSLATE',              0x2924); //         [69][24] -- A tuple of corresponding ID used by chapter codecs to represent this segment.
 128  define('EBML_ID_CHAPPROCESSDATA',               0x2933); //         [69][33] -- Contains the command information. The data should be interpreted depending on the ChapProcessCodecID value. For ChapProcessCodecID = 1, the data correspond to the binary DVD cell pre/post commands.
 129  define('EBML_ID_CHAPPROCESS',                   0x2944); //         [69][44] -- Contains all the commands associated to the Atom.
 130  define('EBML_ID_CHAPPROCESSCODECID',            0x2955); //         [69][55] -- Contains the type of the codec used for the processing. A value of 0 means native Matroska processing (to be defined), a value of 1 means the DVD command set is used. More codec IDs can be added later.
 131  define('EBML_ID_CHAPTERTRANSLATEID',            0x29A5); //         [69][A5] -- The binary value used to represent this segment in the chapter codec data. The format depends on the ChapProcessCodecID used.
 132  define('EBML_ID_CHAPTERTRANSLATECODEC',         0x29BF); //         [69][BF] -- The chapter codec using this ID (0: Matroska Script, 1: DVD-menu).
 133  define('EBML_ID_CHAPTERTRANSLATEEDITIONUID',    0x29FC); //         [69][FC] -- Specify an edition UID on which this correspondance applies. When not specified, it means for all editions found in the segment.
 134  define('EBML_ID_CONTENTENCODINGS',              0x2D80); //         [6D][80] -- Settings for several content encoding mechanisms like compression or encryption.
 135  define('EBML_ID_MINCACHE',                      0x2DE7); //         [6D][E7] -- The minimum number of frames a player should be able to cache during playback. If set to 0, the reference pseudo-cache system is not used.
 136  define('EBML_ID_MAXCACHE',                      0x2DF8); //         [6D][F8] -- The maximum cache size required to store referenced frames in and the current frame. 0 means no cache is needed.
 137  define('EBML_ID_CHAPTERSEGMENTUID',             0x2E67); //         [6E][67] -- A segment to play in place of this chapter. Edition ChapterSegmentEditionUID should be used for this segment, otherwise no edition is used.
 138  define('EBML_ID_CHAPTERSEGMENTEDITIONUID',      0x2EBC); //         [6E][BC] -- The edition to play from the segment linked in ChapterSegmentUID.
 139  define('EBML_ID_TRACKOVERLAY',                  0x2FAB); //         [6F][AB] -- Specify that this track is an overlay track for the Track specified (in the u-integer). That means when this track has a gap (see SilentTracks) the overlay track should be used instead. The order of multiple TrackOverlay matters, the first one is the one that should be used. If not found it should be the second, etc.
 140  define('EBML_ID_TAG',                           0x3373); //         [73][73] -- Element containing elements specific to Tracks/Chapters.
 141  define('EBML_ID_SEGMENTFILENAME',               0x3384); //         [73][84] -- A filename corresponding to this segment.
 142  define('EBML_ID_SEGMENTUID',                    0x33A4); //         [73][A4] -- A randomly generated unique ID to identify the current segment between many others (128 bits).
 143  define('EBML_ID_CHAPTERUID',                    0x33C4); //         [73][C4] -- A unique ID to identify the Chapter.
 144  define('EBML_ID_TRACKUID',                      0x33C5); //         [73][C5] -- A unique ID to identify the Track. This should be kept the same when making a direct stream copy of the Track to another file.
 145  define('EBML_ID_ATTACHMENTLINK',                0x3446); //         [74][46] -- The UID of an attachment that is used by this codec.
 146  define('EBML_ID_CLUSTERBLOCKADDITIONS',         0x35A1); //         [75][A1] -- Contain additional blocks to complete the main one. An EBML parser that has no knowledge of the Block structure could still see and use/skip these data.
 147  define('EBML_ID_CHANNELPOSITIONS',              0x347B); //         [7D][7B] -- Table of horizontal angles for each successive channel, see appendix.
 148  define('EBML_ID_OUTPUTSAMPLINGFREQUENCY',       0x38B5); //         [78][B5] -- Real output sampling frequency in Hz (used for SBR techniques).
 149  define('EBML_ID_TITLE',                         0x3BA9); //         [7B][A9] -- General name of the segment.
 150  define('EBML_ID_CHAPTERDISPLAY',                  0x00); //             [80] -- Contains all possible strings to use for the chapter display.
 151  define('EBML_ID_TRACKTYPE',                       0x03); //             [83] -- A set of track types coded on 8 bits (1: video, 2: audio, 3: complex, 0x10: logo, 0x11: subtitle, 0x12: buttons, 0x20: control).
 152  define('EBML_ID_CHAPSTRING',                      0x05); //             [85] -- Contains the string to use as the chapter atom.
 153  define('EBML_ID_CODECID',                         0x06); //             [86] -- An ID corresponding to the codec, see the codec page for more info.
 154  define('EBML_ID_FLAGDEFAULT',                     0x08); //             [88] -- Set if that track (audio, video or subs) SHOULD be used if no language found matches the user preference.
 155  define('EBML_ID_CHAPTERTRACKNUMBER',              0x09); //             [89] -- UID of the Track to apply this chapter too. In the absense of a control track, choosing this chapter will select the listed Tracks and deselect unlisted tracks. Absense of this element indicates that the Chapter should be applied to any currently used Tracks.
 156  define('EBML_ID_CLUSTERSLICES',                   0x0E); //             [8E] -- Contains slices description.
 157  define('EBML_ID_CHAPTERTRACK',                    0x0F); //             [8F] -- List of tracks on which the chapter applies. If this element is not present, all tracks apply
 158  define('EBML_ID_CHAPTERTIMESTART',                0x11); //             [91] -- Timecode of the start of Chapter (not scaled).
 159  define('EBML_ID_CHAPTERTIMEEND',                  0x12); //             [92] -- Timecode of the end of Chapter (timecode excluded, not scaled).
 160  define('EBML_ID_CUEREFTIME',                      0x16); //             [96] -- Timecode of the referenced Block.
 161  define('EBML_ID_CUEREFCLUSTER',                   0x17); //             [97] -- Position of the Cluster containing the referenced Block.
 162  define('EBML_ID_CHAPTERFLAGHIDDEN',               0x18); //             [98] -- If a chapter is hidden (1), it should not be available to the user interface (but still to Control Tracks).
 163  define('EBML_ID_FLAGINTERLACED',                  0x1A); //             [9A] -- Set if the video is interlaced.
 164  define('EBML_ID_CLUSTERBLOCKDURATION',            0x1B); //             [9B] -- The duration of the Block (based on TimecodeScale). This element is mandatory when DefaultDuration is set for the track. When not written and with no DefaultDuration, the value is assumed to be the difference between the timecode of this Block and the timecode of the next Block in "display" order (not coding order). This element can be useful at the end of a Track (as there is not other Block available), or when there is a break in a track like for subtitle tracks.
 165  define('EBML_ID_FLAGLACING',                      0x1C); //             [9C] -- Set if the track may contain blocks using lacing.
 166  define('EBML_ID_CHANNELS',                        0x1F); //             [9F] -- Numbers of channels in the track.
 167  define('EBML_ID_CLUSTERBLOCKGROUP',               0x20); //             [A0] -- Basic container of information containing a single Block or BlockVirtual, and information specific to that Block/VirtualBlock.
 168  define('EBML_ID_CLUSTERBLOCK',                    0x21); //             [A1] -- Block containing the actual data to be rendered and a timecode relative to the Cluster Timecode.
 169  define('EBML_ID_CLUSTERBLOCKVIRTUAL',             0x22); //             [A2] -- A Block with no data. It must be stored in the stream at the place the real Block should be in display order.
 170  define('EBML_ID_CLUSTERSIMPLEBLOCK',              0x23); //             [A3] -- Similar to Block but without all the extra information, mostly used to reduced overhead when no extra feature is needed.
 171  define('EBML_ID_CLUSTERCODECSTATE',               0x24); //             [A4] -- The new codec state to use. Data interpretation is private to the codec. This information should always be referenced by a seek entry.
 172  define('EBML_ID_CLUSTERBLOCKADDITIONAL',          0x25); //             [A5] -- Interpreted by the codec as it wishes (using the BlockAddID).
 173  define('EBML_ID_CLUSTERBLOCKMORE',                0x26); //             [A6] -- Contain the BlockAdditional and some parameters.
 174  define('EBML_ID_CLUSTERPOSITION',                 0x27); //             [A7] -- Position of the Cluster in the segment (0 in live broadcast streams). It might help to resynchronise offset on damaged streams.
 175  define('EBML_ID_CODECDECODEALL',                  0x2A); //             [AA] -- The codec can decode potentially damaged data.
 176  define('EBML_ID_CLUSTERPREVSIZE',                 0x2B); //             [AB] -- Size of the previous Cluster, in octets. Can be useful for backward playing.
 177  define('EBML_ID_TRACKENTRY',                      0x2E); //             [AE] -- Describes a track with all elements.
 178  define('EBML_ID_CLUSTERENCRYPTEDBLOCK',           0x2F); //             [AF] -- Similar to SimpleBlock but the data inside the Block are Transformed (encrypt and/or signed).
 179  define('EBML_ID_PIXELWIDTH',                      0x30); //             [B0] -- Width of the encoded video frames in pixels.
 180  define('EBML_ID_CUETIME',                         0x33); //             [B3] -- Absolute timecode according to the segment time base.
 181  define('EBML_ID_SAMPLINGFREQUENCY',               0x35); //             [B5] -- Sampling frequency in Hz.
 182  define('EBML_ID_CHAPTERATOM',                     0x36); //             [B6] -- Contains the atom information to use as the chapter atom (apply to all tracks).
 183  define('EBML_ID_CUETRACKPOSITIONS',               0x37); //             [B7] -- Contain positions for different tracks corresponding to the timecode.
 184  define('EBML_ID_FLAGENABLED',                     0x39); //             [B9] -- Set if the track is used.
 185  define('EBML_ID_PIXELHEIGHT',                     0x3A); //             [BA] -- Height of the encoded video frames in pixels.
 186  define('EBML_ID_CUEPOINT',                        0x3B); //             [BB] -- Contains all information relative to a seek point in the segment.
 187  define('EBML_ID_CRC32',                           0x3F); //             [BF] -- The CRC is computed on all the data of the Master element it's in, regardless of its position. It's recommended to put the CRC value at the beggining of the Master element for easier reading. All level 1 elements should include a CRC-32.
 188  define('EBML_ID_CLUSTERBLOCKADDITIONID',          0x4B); //             [CB] -- The ID of the BlockAdditional element (0 is the main Block).
 189  define('EBML_ID_CLUSTERLACENUMBER',               0x4C); //             [CC] -- The reverse number of the frame in the lace (0 is the last frame, 1 is the next to last, etc). While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback.
 190  define('EBML_ID_CLUSTERFRAMENUMBER',              0x4D); //             [CD] -- The number of the frame to generate from this lace with this delay (allow you to generate many frames from the same Block/Frame).
 191  define('EBML_ID_CLUSTERDELAY',                    0x4E); //             [CE] -- The (scaled) delay to apply to the element.
 192  define('EBML_ID_CLUSTERDURATION',                 0x4F); //             [CF] -- The (scaled) duration to apply to the element.
 193  define('EBML_ID_TRACKNUMBER',                     0x57); //             [D7] -- The track number as used in the Block Header (using more than 127 tracks is not encouraged, though the design allows an unlimited number).
 194  define('EBML_ID_CUEREFERENCE',                    0x5B); //             [DB] -- The Clusters containing the required referenced Blocks.
 195  define('EBML_ID_VIDEO',                           0x60); //             [E0] -- Video settings.
 196  define('EBML_ID_AUDIO',                           0x61); //             [E1] -- Audio settings.
 197  define('EBML_ID_CLUSTERTIMESLICE',                0x68); //             [E8] -- Contains extra time information about the data contained in the Block. While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback.
 198  define('EBML_ID_CUECODECSTATE',                   0x6A); //             [EA] -- The position of the Codec State corresponding to this Cue element. 0 means that the data is taken from the initial Track Entry.
 199  define('EBML_ID_CUEREFCODECSTATE',                0x6B); //             [EB] -- The position of the Codec State corresponding to this referenced element. 0 means that the data is taken from the initial Track Entry.
 200  define('EBML_ID_VOID',                            0x6C); //             [EC] -- Used to void damaged data, to avoid unexpected behaviors when using damaged data. The content is discarded. Also used to reserve space in a sub-element for later use.
 201  define('EBML_ID_CLUSTERTIMECODE',                 0x67); //             [E7] -- Absolute timecode of the cluster (based on TimecodeScale).
 202  define('EBML_ID_CLUSTERBLOCKADDID',               0x6E); //             [EE] -- An ID to identify the BlockAdditional level.
 203  define('EBML_ID_CUECLUSTERPOSITION',              0x71); //             [F1] -- The position of the Cluster containing the required Block.
 204  define('EBML_ID_CUETRACK',                        0x77); //             [F7] -- The track for which a position is given.
 205  define('EBML_ID_CLUSTERREFERENCEPRIORITY',        0x7A); //             [FA] -- This frame is referenced and has the specified cache priority. In cache only a frame of the same or higher priority can replace this frame. A value of 0 means the frame is not referenced.
 206  define('EBML_ID_CLUSTERREFERENCEBLOCK',           0x7B); //             [FB] -- Timecode of another frame used as a reference (ie: B or P frame). The timecode is relative to the block it's attached to.
 207  define('EBML_ID_CLUSTERREFERENCEVIRTUAL',         0x7D); //             [FD] -- Relative position of the data that should be in position of the virtual block.
 208  
 209  
 210  /**
 211  * @tutorial http://www.matroska.org/technical/specs/index.html
 212  *
 213  * @todo Rewrite EBML parser to reduce it's size and honor default element values
 214  * @todo After rewrite implement stream size calculation, that will provide additional useful info and enable AAC/FLAC audio bitrate detection
 215  */
 216  class getid3_matroska extends getid3_handler
 217  {
 218      /**
 219       * If true, do not return information about CLUSTER chunks, since there's a lot of them
 220       * and they're not usually useful [default: TRUE].
 221       *
 222       * @var bool
 223       */
 224      public static $hide_clusters    = true;
 225  
 226      /**
 227       * True to parse the whole file, not only header [default: FALSE].
 228       *
 229       * @var bool
 230       */
 231      public static $parse_whole_file = false;
 232  
 233      /*
 234       * Private parser settings/placeholders.
 235       */
 236      private $EBMLbuffer        = '';
 237      private $EBMLbuffer_offset = 0;
 238      private $EBMLbuffer_length = 0;
 239      private $current_offset    = 0;
 240      private $unuseful_elements = array(EBML_ID_CRC32, EBML_ID_VOID);
 241  
 242      /**
 243       * @return bool
 244       */
 245  	public function Analyze()
 246      {
 247          $info = &$this->getid3->info;
 248  
 249          // parse container
 250          try {
 251              $this->parseEBML($info);
 252          } catch (Exception $e) {
 253              $this->error('EBML parser: '.$e->getMessage());
 254          }
 255  
 256          // calculate playtime
 257          if (isset($info['matroska']['info']) && is_array($info['matroska']['info'])) {
 258              foreach ($info['matroska']['info'] as $key => $infoarray) {
 259                  if (isset($infoarray['Duration'])) {
 260                      // TimecodeScale is how many nanoseconds each Duration unit is
 261                      $info['playtime_seconds'] = $infoarray['Duration'] * ((isset($infoarray['TimecodeScale']) ? $infoarray['TimecodeScale'] : 1000000) / 1000000000);
 262                      break;
 263                  }
 264              }
 265          }
 266  
 267          // extract tags
 268          if (isset($info['matroska']['tags']) && is_array($info['matroska']['tags'])) {
 269              foreach ($info['matroska']['tags'] as $key => $infoarray) {
 270                  $this->ExtractCommentsSimpleTag($infoarray);
 271              }
 272          }
 273  
 274          // process tracks
 275          if (isset($info['matroska']['tracks']['tracks']) && is_array($info['matroska']['tracks']['tracks'])) {
 276              foreach ($info['matroska']['tracks']['tracks'] as $key => $trackarray) {
 277  
 278                  $track_info = array();
 279                  $track_info['dataformat'] = self::CodecIDtoCommonName($trackarray['CodecID']);
 280                  $track_info['default'] = (isset($trackarray['FlagDefault']) ? $trackarray['FlagDefault'] : true);
 281                  if (isset($trackarray['Name'])) { $track_info['name'] = $trackarray['Name']; }
 282  
 283                  switch ($trackarray['TrackType']) {
 284  
 285                      case 1: // Video
 286                          $track_info['resolution_x'] = $trackarray['PixelWidth'];
 287                          $track_info['resolution_y'] = $trackarray['PixelHeight'];
 288                          $track_info['display_unit'] = self::displayUnit(isset($trackarray['DisplayUnit']) ? $trackarray['DisplayUnit'] : 0);
 289                          $track_info['display_x']    = (isset($trackarray['DisplayWidth']) ? $trackarray['DisplayWidth'] : $trackarray['PixelWidth']);
 290                          $track_info['display_y']    = (isset($trackarray['DisplayHeight']) ? $trackarray['DisplayHeight'] : $trackarray['PixelHeight']);
 291  
 292                          if (isset($trackarray['PixelCropBottom'])) { $track_info['crop_bottom'] = $trackarray['PixelCropBottom']; }
 293                          if (isset($trackarray['PixelCropTop']))    { $track_info['crop_top']    = $trackarray['PixelCropTop']; }
 294                          if (isset($trackarray['PixelCropLeft']))   { $track_info['crop_left']   = $trackarray['PixelCropLeft']; }
 295                          if (isset($trackarray['PixelCropRight']))  { $track_info['crop_right']  = $trackarray['PixelCropRight']; }
 296                          if (isset($trackarray['DefaultDuration'])) { $track_info['frame_rate']  = round(1000000000 / $trackarray['DefaultDuration'], 3); }
 297                          if (isset($trackarray['CodecName']))       { $track_info['codec']       = $trackarray['CodecName']; }
 298  
 299                          switch ($trackarray['CodecID']) {
 300                              case 'V_MS/VFW/FOURCC':
 301                                  getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
 302  
 303                                  $parsed = getid3_riff::ParseBITMAPINFOHEADER($trackarray['CodecPrivate']);
 304                                  $track_info['codec'] = getid3_riff::fourccLookup($parsed['fourcc']);
 305                                  $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $parsed;
 306                                  break;
 307  
 308                              /*case 'V_MPEG4/ISO/AVC':
 309                                  $h264['profile']    = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 1, 1));
 310                                  $h264['level']      = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 3, 1));
 311                                  $rn                 = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 4, 1));
 312                                  $h264['NALUlength'] = ($rn & 3) + 1;
 313                                  $rn                 = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 5, 1));
 314                                  $nsps               = ($rn & 31);
 315                                  $offset             = 6;
 316                                  for ($i = 0; $i < $nsps; $i ++) {
 317                                      $length        = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 2));
 318                                      $h264['SPS'][] = substr($trackarray['CodecPrivate'], $offset + 2, $length);
 319                                      $offset       += 2 + $length;
 320                                  }
 321                                  $npps               = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 1));
 322                                  $offset            += 1;
 323                                  for ($i = 0; $i < $npps; $i ++) {
 324                                      $length        = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 2));
 325                                      $h264['PPS'][] = substr($trackarray['CodecPrivate'], $offset + 2, $length);
 326                                      $offset       += 2 + $length;
 327                                  }
 328                                  $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $h264;
 329                                  break;*/
 330                          }
 331  
 332                          $info['video']['streams'][] = $track_info;
 333                          break;
 334  
 335                      case 2: // Audio
 336                          $track_info['sample_rate'] = (isset($trackarray['SamplingFrequency']) ? $trackarray['SamplingFrequency'] : 8000.0);
 337                          $track_info['channels']    = (isset($trackarray['Channels']) ? $trackarray['Channels'] : 1);
 338                          $track_info['language']    = (isset($trackarray['Language']) ? $trackarray['Language'] : 'eng');
 339                          if (isset($trackarray['BitDepth']))  { $track_info['bits_per_sample'] = $trackarray['BitDepth']; }
 340                          if (isset($trackarray['CodecName'])) { $track_info['codec']           = $trackarray['CodecName']; }
 341  
 342                          switch ($trackarray['CodecID']) {
 343                              case 'A_PCM/INT/LIT':
 344                              case 'A_PCM/INT/BIG':
 345                                  $track_info['bitrate'] = $track_info['sample_rate'] * $track_info['channels'] * $trackarray['BitDepth'];
 346                                  break;
 347  
 348                              case 'A_AC3':
 349                              case 'A_EAC3':
 350                              case 'A_DTS':
 351                              case 'A_MPEG/L3':
 352                              case 'A_MPEG/L2':
 353                              case 'A_FLAC':
 354                                  $module_dataformat = ($track_info['dataformat'] == 'mp2' ? 'mp3' : ($track_info['dataformat'] == 'eac3' ? 'ac3' : $track_info['dataformat']));
 355                                  getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.'.$module_dataformat.'.php', __FILE__, true);
 356  
 357                                  if (!isset($info['matroska']['track_data_offsets'][$trackarray['TrackNumber']])) {
 358                                      $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because $info[matroska][track_data_offsets]['.$trackarray['TrackNumber'].'] not set');
 359                                      break;
 360                                  }
 361  
 362                                  // create temp instance
 363                                  $getid3_temp = new getID3();
 364                                  if ($track_info['dataformat'] != 'flac') {
 365                                      $getid3_temp->openfile($this->getid3->filename);
 366                                  }
 367                                  $getid3_temp->info['avdataoffset'] = $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['offset'];
 368                                  if ($track_info['dataformat'][0] == 'm' || $track_info['dataformat'] == 'flac') {
 369                                      $getid3_temp->info['avdataend'] = $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['offset'] + $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['length'];
 370                                  }
 371  
 372                                  // analyze
 373                                  $class = 'getid3_'.$module_dataformat;
 374                                  $header_data_key = $track_info['dataformat'][0] == 'm' ? 'mpeg' : $track_info['dataformat'];
 375                                  $getid3_audio = new $class($getid3_temp, __CLASS__);
 376                                  if ($track_info['dataformat'] == 'flac') {
 377                                      $getid3_audio->AnalyzeString($trackarray['CodecPrivate']);
 378                                  }
 379                                  else {
 380                                      $getid3_audio->Analyze();
 381                                  }
 382                                  if (!empty($getid3_temp->info[$header_data_key])) {
 383                                      $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $getid3_temp->info[$header_data_key];
 384                                      if (isset($getid3_temp->info['audio']) && is_array($getid3_temp->info['audio'])) {
 385                                          foreach ($getid3_temp->info['audio'] as $sub_key => $value) {
 386                                              $track_info[$sub_key] = $value;
 387                                          }
 388                                      }
 389                                  }
 390                                  else {
 391                                      $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because '.$class.'::Analyze() failed at offset '.$getid3_temp->info['avdataoffset']);
 392                                  }
 393  
 394                                  // copy errors and warnings
 395                                  if (!empty($getid3_temp->info['error'])) {
 396                                      foreach ($getid3_temp->info['error'] as $newerror) {
 397                                          $this->warning($class.'() says: ['.$newerror.']');
 398                                      }
 399                                  }
 400                                  if (!empty($getid3_temp->info['warning'])) {
 401                                      foreach ($getid3_temp->info['warning'] as $newerror) {
 402                                          $this->warning($class.'() says: ['.$newerror.']');
 403                                      }
 404                                  }
 405                                  unset($getid3_temp, $getid3_audio);
 406                                  break;
 407  
 408                              case 'A_AAC':
 409                              case 'A_AAC/MPEG2/LC':
 410                              case 'A_AAC/MPEG2/LC/SBR':
 411                              case 'A_AAC/MPEG4/LC':
 412                              case 'A_AAC/MPEG4/LC/SBR':
 413                                  $this->warning($trackarray['CodecID'].' audio data contains no header, audio/video bitrates can\'t be calculated');
 414                                  break;
 415  
 416                              case 'A_VORBIS':
 417                                  if (!isset($trackarray['CodecPrivate'])) {
 418                                      $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because CodecPrivate data not set');
 419                                      break;
 420                                  }
 421                                  $vorbis_offset = strpos($trackarray['CodecPrivate'], 'vorbis', 1);
 422                                  if ($vorbis_offset === false) {
 423                                      $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because CodecPrivate data does not contain "vorbis" keyword');
 424                                      break;
 425                                  }
 426                                  $vorbis_offset -= 1;
 427  
 428                                  getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
 429  
 430                                  // create temp instance
 431                                  $getid3_temp = new getID3();
 432  
 433                                  // analyze
 434                                  $getid3_ogg = new getid3_ogg($getid3_temp);
 435                                  $oggpageinfo['page_seqno'] = 0;
 436                                  $getid3_ogg->ParseVorbisPageHeader($trackarray['CodecPrivate'], $vorbis_offset, $oggpageinfo);
 437                                  if (!empty($getid3_temp->info['ogg'])) {
 438                                      $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $getid3_temp->info['ogg'];
 439                                      if (isset($getid3_temp->info['audio']) && is_array($getid3_temp->info['audio'])) {
 440                                          foreach ($getid3_temp->info['audio'] as $sub_key => $value) {
 441                                              $track_info[$sub_key] = $value;
 442                                          }
 443                                      }
 444                                  }
 445  
 446                                  // copy errors and warnings
 447                                  if (!empty($getid3_temp->info['error'])) {
 448                                      foreach ($getid3_temp->info['error'] as $newerror) {
 449                                          $this->warning('getid3_ogg() says: ['.$newerror.']');
 450                                      }
 451                                  }
 452                                  if (!empty($getid3_temp->info['warning'])) {
 453                                      foreach ($getid3_temp->info['warning'] as $newerror) {
 454                                          $this->warning('getid3_ogg() says: ['.$newerror.']');
 455                                      }
 456                                  }
 457  
 458                                  if (!empty($getid3_temp->info['ogg']['bitrate_nominal'])) {
 459                                      $track_info['bitrate'] = $getid3_temp->info['ogg']['bitrate_nominal'];
 460                                  }
 461                                  unset($getid3_temp, $getid3_ogg, $oggpageinfo, $vorbis_offset);
 462                                  break;
 463  
 464                              case 'A_MS/ACM':
 465                                  getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
 466  
 467                                  $parsed = getid3_riff::parseWAVEFORMATex($trackarray['CodecPrivate']);
 468                                  foreach ($parsed as $sub_key => $value) {
 469                                      if ($sub_key != 'raw') {
 470                                          $track_info[$sub_key] = $value;
 471                                      }
 472                                  }
 473                                  $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $parsed;
 474                                  break;
 475  
 476                              default:
 477                                  $this->warning('Unhandled audio type "'.(isset($trackarray['CodecID']) ? $trackarray['CodecID'] : '').'"');
 478                                  break;
 479                          }
 480  
 481                          $info['audio']['streams'][] = $track_info;
 482                          break;
 483                  }
 484              }
 485  
 486              if (!empty($info['video']['streams'])) {
 487                  $info['video'] = self::getDefaultStreamInfo($info['video']['streams']);
 488              }
 489              if (!empty($info['audio']['streams'])) {
 490                  $info['audio'] = self::getDefaultStreamInfo($info['audio']['streams']);
 491              }
 492          }
 493  
 494          // process attachments
 495          if (isset($info['matroska']['attachments']) && $this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE) {
 496              foreach ($info['matroska']['attachments'] as $i => $entry) {
 497                  if (strpos($entry['FileMimeType'], 'image/') === 0 && !empty($entry['FileData'])) {
 498                      $info['matroska']['comments']['picture'][] = array('data' => $entry['FileData'], 'image_mime' => $entry['FileMimeType'], 'filename' => $entry['FileName']);
 499                  }
 500              }
 501          }
 502  
 503          // determine mime type
 504          if (!empty($info['video']['streams'])) {
 505              $info['mime_type'] = ($info['matroska']['doctype'] == 'webm' ? 'video/webm' : 'video/x-matroska');
 506          } elseif (!empty($info['audio']['streams'])) {
 507              $info['mime_type'] = ($info['matroska']['doctype'] == 'webm' ? 'audio/webm' : 'audio/x-matroska');
 508          } elseif (isset($info['mime_type'])) {
 509              unset($info['mime_type']);
 510          }
 511  
 512          return true;
 513      }
 514  
 515      /**
 516       * @param array $info
 517       */
 518  	private function parseEBML(&$info) {
 519          // http://www.matroska.org/technical/specs/index.html#EBMLBasics
 520          $this->current_offset = $info['avdataoffset'];
 521  
 522          while ($this->getEBMLelement($top_element, $info['avdataend'])) {
 523              switch ($top_element['id']) {
 524  
 525                  case EBML_ID_EBML:
 526                      $info['matroska']['header']['offset'] = $top_element['offset'];
 527                      $info['matroska']['header']['length'] = $top_element['length'];
 528  
 529                      while ($this->getEBMLelement($element_data, $top_element['end'], true)) {
 530                          switch ($element_data['id']) {
 531  
 532                              case EBML_ID_EBMLVERSION:
 533                              case EBML_ID_EBMLREADVERSION:
 534                              case EBML_ID_EBMLMAXIDLENGTH:
 535                              case EBML_ID_EBMLMAXSIZELENGTH:
 536                              case EBML_ID_DOCTYPEVERSION:
 537                              case EBML_ID_DOCTYPEREADVERSION:
 538                                  $element_data['data'] = getid3_lib::BigEndian2Int($element_data['data']);
 539                                  break;
 540  
 541                              case EBML_ID_DOCTYPE:
 542                                  $element_data['data'] = getid3_lib::trimNullByte($element_data['data']);
 543                                  $info['matroska']['doctype'] = $element_data['data'];
 544                                  $info['fileformat'] = $element_data['data'];
 545                                  break;
 546  
 547                              default:
 548                                  $this->unhandledElement('header', __LINE__, $element_data);
 549                                  break;
 550                          }
 551  
 552                          unset($element_data['offset'], $element_data['end']);
 553                          $info['matroska']['header']['elements'][] = $element_data;
 554                      }
 555                      break;
 556  
 557                  case EBML_ID_SEGMENT:
 558                      $info['matroska']['segment'][0]['offset'] = $top_element['offset'];
 559                      $info['matroska']['segment'][0]['length'] = $top_element['length'];
 560  
 561                      while ($this->getEBMLelement($element_data, $top_element['end'])) {
 562                          if ($element_data['id'] != EBML_ID_CLUSTER || !self::$hide_clusters) { // collect clusters only if required
 563                              $info['matroska']['segments'][] = $element_data;
 564                          }
 565                          switch ($element_data['id']) {
 566  
 567                              case EBML_ID_SEEKHEAD: // Contains the position of other level 1 elements.
 568  
 569                                  while ($this->getEBMLelement($seek_entry, $element_data['end'])) {
 570                                      switch ($seek_entry['id']) {
 571  
 572                                          case EBML_ID_SEEK: // Contains a single seek entry to an EBML element
 573                                              while ($this->getEBMLelement($sub_seek_entry, $seek_entry['end'], true)) {
 574  
 575                                                  switch ($sub_seek_entry['id']) {
 576  
 577                                                      case EBML_ID_SEEKID:
 578                                                          $seek_entry['target_id']   = self::EBML2Int($sub_seek_entry['data']);
 579                                                          $seek_entry['target_name'] = self::EBMLidName($seek_entry['target_id']);
 580                                                          break;
 581  
 582                                                      case EBML_ID_SEEKPOSITION:
 583                                                          $seek_entry['target_offset'] = $element_data['offset'] + getid3_lib::BigEndian2Int($sub_seek_entry['data']);
 584                                                          break;
 585  
 586                                                      default:
 587                                                          $this->unhandledElement('seekhead.seek', __LINE__, $sub_seek_entry);                                                }
 588                                                          break;
 589                                              }
 590                                              if (!isset($seek_entry['target_id'])) {
 591                                                  $this->warning('seek_entry[target_id] unexpectedly not set at '.$seek_entry['offset']);
 592                                                  break;
 593                                              }
 594                                              if (($seek_entry['target_id'] != EBML_ID_CLUSTER) || !self::$hide_clusters) { // collect clusters only if required
 595                                                  $info['matroska']['seek'][] = $seek_entry;
 596                                              }
 597                                              break;
 598  
 599                                          default:
 600                                              $this->unhandledElement('seekhead', __LINE__, $seek_entry);
 601                                              break;
 602                                      }
 603                                  }
 604                                  break;
 605  
 606                              case EBML_ID_TRACKS: // A top-level block of information with many tracks described.
 607                                  $info['matroska']['tracks'] = $element_data;
 608  
 609                                  while ($this->getEBMLelement($track_entry, $element_data['end'])) {
 610                                      switch ($track_entry['id']) {
 611  
 612                                          case EBML_ID_TRACKENTRY: //subelements: Describes a track with all elements.
 613  
 614                                              while ($this->getEBMLelement($subelement, $track_entry['end'], array(EBML_ID_VIDEO, EBML_ID_AUDIO, EBML_ID_CONTENTENCODINGS, EBML_ID_CODECPRIVATE))) {
 615                                                  switch ($subelement['id']) {
 616  
 617                                                      case EBML_ID_TRACKNUMBER:
 618                                                      case EBML_ID_TRACKUID:
 619                                                      case EBML_ID_TRACKTYPE:
 620                                                      case EBML_ID_MINCACHE:
 621                                                      case EBML_ID_MAXCACHE:
 622                                                      case EBML_ID_MAXBLOCKADDITIONID:
 623                                                      case EBML_ID_DEFAULTDURATION: // nanoseconds per frame
 624                                                          $track_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
 625                                                          break;
 626  
 627                                                      case EBML_ID_TRACKTIMECODESCALE:
 628                                                          $track_entry[$subelement['id_name']] = getid3_lib::BigEndian2Float($subelement['data']);
 629                                                          break;
 630  
 631                                                      case EBML_ID_CODECID:
 632                                                      case EBML_ID_LANGUAGE:
 633                                                      case EBML_ID_NAME:
 634                                                      case EBML_ID_CODECNAME:
 635                                                          $track_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
 636                                                          break;
 637  
 638                                                      case EBML_ID_CODECPRIVATE:
 639                                                          $track_entry[$subelement['id_name']] = $this->readEBMLelementData($subelement['length'], true);
 640                                                          break;
 641  
 642                                                      case EBML_ID_FLAGENABLED:
 643                                                      case EBML_ID_FLAGDEFAULT:
 644                                                      case EBML_ID_FLAGFORCED:
 645                                                      case EBML_ID_FLAGLACING:
 646                                                      case EBML_ID_CODECDECODEALL:
 647                                                          $track_entry[$subelement['id_name']] = (bool) getid3_lib::BigEndian2Int($subelement['data']);
 648                                                          break;
 649  
 650                                                      case EBML_ID_VIDEO:
 651  
 652                                                          while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
 653                                                              switch ($sub_subelement['id']) {
 654  
 655                                                                  case EBML_ID_PIXELWIDTH:
 656                                                                  case EBML_ID_PIXELHEIGHT:
 657                                                                  case EBML_ID_PIXELCROPBOTTOM:
 658                                                                  case EBML_ID_PIXELCROPTOP:
 659                                                                  case EBML_ID_PIXELCROPLEFT:
 660                                                                  case EBML_ID_PIXELCROPRIGHT:
 661                                                                  case EBML_ID_DISPLAYWIDTH:
 662                                                                  case EBML_ID_DISPLAYHEIGHT:
 663                                                                  case EBML_ID_DISPLAYUNIT:
 664                                                                  case EBML_ID_ASPECTRATIOTYPE:
 665                                                                  case EBML_ID_STEREOMODE:
 666                                                                  case EBML_ID_OLDSTEREOMODE:
 667                                                                      $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 668                                                                      break;
 669  
 670                                                                  case EBML_ID_FLAGINTERLACED:
 671                                                                      $track_entry[$sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_subelement['data']);
 672                                                                      break;
 673  
 674                                                                  case EBML_ID_GAMMAVALUE:
 675                                                                      $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Float($sub_subelement['data']);
 676                                                                      break;
 677  
 678                                                                  case EBML_ID_COLOURSPACE:
 679                                                                      $track_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
 680                                                                      break;
 681  
 682                                                                  default:
 683                                                                      $this->unhandledElement('track.video', __LINE__, $sub_subelement);
 684                                                                      break;
 685                                                              }
 686                                                          }
 687                                                          break;
 688  
 689                                                      case EBML_ID_AUDIO:
 690  
 691                                                          while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
 692                                                              switch ($sub_subelement['id']) {
 693  
 694                                                                  case EBML_ID_CHANNELS:
 695                                                                  case EBML_ID_BITDEPTH:
 696                                                                      $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 697                                                                      break;
 698  
 699                                                                  case EBML_ID_SAMPLINGFREQUENCY:
 700                                                                  case EBML_ID_OUTPUTSAMPLINGFREQUENCY:
 701                                                                      $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Float($sub_subelement['data']);
 702                                                                      break;
 703  
 704                                                                  case EBML_ID_CHANNELPOSITIONS:
 705                                                                      $track_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
 706                                                                      break;
 707  
 708                                                                  default:
 709                                                                      $this->unhandledElement('track.audio', __LINE__, $sub_subelement);
 710                                                                      break;
 711                                                              }
 712                                                          }
 713                                                          break;
 714  
 715                                                      case EBML_ID_CONTENTENCODINGS:
 716  
 717                                                          while ($this->getEBMLelement($sub_subelement, $subelement['end'])) {
 718                                                              switch ($sub_subelement['id']) {
 719  
 720                                                                  case EBML_ID_CONTENTENCODING:
 721  
 722                                                                      while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], array(EBML_ID_CONTENTCOMPRESSION, EBML_ID_CONTENTENCRYPTION))) {
 723                                                                          switch ($sub_sub_subelement['id']) {
 724  
 725                                                                              case EBML_ID_CONTENTENCODINGORDER:
 726                                                                              case EBML_ID_CONTENTENCODINGSCOPE:
 727                                                                              case EBML_ID_CONTENTENCODINGTYPE:
 728                                                                                  $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 729                                                                                  break;
 730  
 731                                                                              case EBML_ID_CONTENTCOMPRESSION:
 732  
 733                                                                                  while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
 734                                                                                      switch ($sub_sub_sub_subelement['id']) {
 735  
 736                                                                                          case EBML_ID_CONTENTCOMPALGO:
 737                                                                                              $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
 738                                                                                              break;
 739  
 740                                                                                          case EBML_ID_CONTENTCOMPSETTINGS:
 741                                                                                              $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
 742                                                                                              break;
 743  
 744                                                                                          default:
 745                                                                                              $this->unhandledElement('track.contentencodings.contentencoding.contentcompression', __LINE__, $sub_sub_sub_subelement);
 746                                                                                              break;
 747                                                                                      }
 748                                                                                  }
 749                                                                                  break;
 750  
 751                                                                              case EBML_ID_CONTENTENCRYPTION:
 752  
 753                                                                                  while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
 754                                                                                      switch ($sub_sub_sub_subelement['id']) {
 755  
 756                                                                                          case EBML_ID_CONTENTENCALGO:
 757                                                                                          case EBML_ID_CONTENTSIGALGO:
 758                                                                                          case EBML_ID_CONTENTSIGHASHALGO:
 759                                                                                              $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
 760                                                                                              break;
 761  
 762                                                                                          case EBML_ID_CONTENTENCKEYID:
 763                                                                                          case EBML_ID_CONTENTSIGNATURE:
 764                                                                                          case EBML_ID_CONTENTSIGKEYID:
 765                                                                                              $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
 766                                                                                              break;
 767  
 768                                                                                          default:
 769                                                                                              $this->unhandledElement('track.contentencodings.contentencoding.contentcompression', __LINE__, $sub_sub_sub_subelement);
 770                                                                                              break;
 771                                                                                      }
 772                                                                                  }
 773                                                                                  break;
 774  
 775                                                                              default:
 776                                                                                  $this->unhandledElement('track.contentencodings.contentencoding', __LINE__, $sub_sub_subelement);
 777                                                                                  break;
 778                                                                          }
 779                                                                      }
 780                                                                      break;
 781  
 782                                                                  default:
 783                                                                      $this->unhandledElement('track.contentencodings', __LINE__, $sub_subelement);
 784                                                                      break;
 785                                                              }
 786                                                          }
 787                                                          break;
 788  
 789                                                      default:
 790                                                          $this->unhandledElement('track', __LINE__, $subelement);
 791                                                          break;
 792                                                  }
 793                                              }
 794  
 795                                              $info['matroska']['tracks']['tracks'][] = $track_entry;
 796                                              break;
 797  
 798                                          default:
 799                                              $this->unhandledElement('tracks', __LINE__, $track_entry);
 800                                              break;
 801                                      }
 802                                  }
 803                                  break;
 804  
 805                              case EBML_ID_INFO: // Contains miscellaneous general information and statistics on the file.
 806                                  $info_entry = array();
 807  
 808                                  while ($this->getEBMLelement($subelement, $element_data['end'], true)) {
 809                                      switch ($subelement['id']) {
 810  
 811                                          case EBML_ID_TIMECODESCALE:
 812                                              $info_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
 813                                              break;
 814  
 815                                          case EBML_ID_DURATION:
 816                                              $info_entry[$subelement['id_name']] = getid3_lib::BigEndian2Float($subelement['data']);
 817                                              break;
 818  
 819                                          case EBML_ID_DATEUTC:
 820                                              $info_entry[$subelement['id_name']]         = getid3_lib::BigEndian2Int($subelement['data']);
 821                                              $info_entry[$subelement['id_name'].'_unix'] = self::EBMLdate2unix($info_entry[$subelement['id_name']]);
 822                                              break;
 823  
 824                                          case EBML_ID_SEGMENTUID:
 825                                          case EBML_ID_PREVUID:
 826                                          case EBML_ID_NEXTUID:
 827                                              $info_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
 828                                              break;
 829  
 830                                          case EBML_ID_SEGMENTFAMILY:
 831                                              $info_entry[$subelement['id_name']][] = getid3_lib::trimNullByte($subelement['data']);
 832                                              break;
 833  
 834                                          case EBML_ID_SEGMENTFILENAME:
 835                                          case EBML_ID_PREVFILENAME:
 836                                          case EBML_ID_NEXTFILENAME:
 837                                          case EBML_ID_TITLE:
 838                                          case EBML_ID_MUXINGAPP:
 839                                          case EBML_ID_WRITINGAPP:
 840                                              $info_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
 841                                              $info['matroska']['comments'][strtolower($subelement['id_name'])][] = $info_entry[$subelement['id_name']];
 842                                              break;
 843  
 844                                          case EBML_ID_CHAPTERTRANSLATE:
 845                                              $chaptertranslate_entry = array();
 846  
 847                                              while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
 848                                                  switch ($sub_subelement['id']) {
 849  
 850                                                      case EBML_ID_CHAPTERTRANSLATEEDITIONUID:
 851                                                          $chaptertranslate_entry[$sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 852                                                          break;
 853  
 854                                                      case EBML_ID_CHAPTERTRANSLATECODEC:
 855                                                          $chaptertranslate_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 856                                                          break;
 857  
 858                                                      case EBML_ID_CHAPTERTRANSLATEID:
 859                                                          $chaptertranslate_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
 860                                                          break;
 861  
 862                                                      default:
 863                                                          $this->unhandledElement('info.chaptertranslate', __LINE__, $sub_subelement);
 864                                                          break;
 865                                                  }
 866                                              }
 867                                              $info_entry[$subelement['id_name']] = $chaptertranslate_entry;
 868                                              break;
 869  
 870                                          default:
 871                                              $this->unhandledElement('info', __LINE__, $subelement);
 872                                              break;
 873                                      }
 874                                  }
 875                                  $info['matroska']['info'][] = $info_entry;
 876                                  break;
 877  
 878                              case EBML_ID_CUES: // A top-level element to speed seeking access. All entries are local to the segment. Should be mandatory for non "live" streams.
 879                                  if (self::$hide_clusters) { // do not parse cues if hide clusters is "ON" till they point to clusters anyway
 880                                      $this->current_offset = $element_data['end'];
 881                                      break;
 882                                  }
 883                                  $cues_entry = array();
 884  
 885                                  while ($this->getEBMLelement($subelement, $element_data['end'])) {
 886                                      switch ($subelement['id']) {
 887  
 888                                          case EBML_ID_CUEPOINT:
 889                                              $cuepoint_entry = array();
 890  
 891                                              while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CUETRACKPOSITIONS))) {
 892                                                  switch ($sub_subelement['id']) {
 893  
 894                                                      case EBML_ID_CUETRACKPOSITIONS:
 895                                                          $cuetrackpositions_entry = array();
 896  
 897                                                          while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], true)) {
 898                                                              switch ($sub_sub_subelement['id']) {
 899  
 900                                                                  case EBML_ID_CUETRACK:
 901                                                                  case EBML_ID_CUECLUSTERPOSITION:
 902                                                                  case EBML_ID_CUEBLOCKNUMBER:
 903                                                                  case EBML_ID_CUECODECSTATE:
 904                                                                      $cuetrackpositions_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 905                                                                      break;
 906  
 907                                                                  default:
 908                                                                      $this->unhandledElement('cues.cuepoint.cuetrackpositions', __LINE__, $sub_sub_subelement);
 909                                                                      break;
 910                                                              }
 911                                                          }
 912                                                          $cuepoint_entry[$sub_subelement['id_name']][] = $cuetrackpositions_entry;
 913                                                          break;
 914  
 915                                                      case EBML_ID_CUETIME:
 916                                                          $cuepoint_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 917                                                          break;
 918  
 919                                                      default:
 920                                                          $this->unhandledElement('cues.cuepoint', __LINE__, $sub_subelement);
 921                                                          break;
 922                                                  }
 923                                              }
 924                                              $cues_entry[] = $cuepoint_entry;
 925                                              break;
 926  
 927                                          default:
 928                                              $this->unhandledElement('cues', __LINE__, $subelement);
 929                                              break;
 930                                      }
 931                                  }
 932                                  $info['matroska']['cues'] = $cues_entry;
 933                                  break;
 934  
 935                              case EBML_ID_TAGS: // Element containing elements specific to Tracks/Chapters.
 936                                  $tags_entry = array();
 937  
 938                                  while ($this->getEBMLelement($subelement, $element_data['end'], false)) {
 939                                      switch ($subelement['id']) {
 940  
 941                                          case EBML_ID_TAG:
 942                                              $tag_entry = array();
 943  
 944                                              while ($this->getEBMLelement($sub_subelement, $subelement['end'], false)) {
 945                                                  switch ($sub_subelement['id']) {
 946  
 947                                                      case EBML_ID_TARGETS:
 948                                                          $targets_entry = array();
 949  
 950                                                          while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], true)) {
 951                                                              switch ($sub_sub_subelement['id']) {
 952  
 953                                                                  case EBML_ID_TARGETTYPEVALUE:
 954                                                                      $targets_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 955                                                                      $targets_entry[strtolower($sub_sub_subelement['id_name']).'_long'] = self::TargetTypeValue($targets_entry[$sub_sub_subelement['id_name']]);
 956                                                                      break;
 957  
 958                                                                  case EBML_ID_TARGETTYPE:
 959                                                                      $targets_entry[$sub_sub_subelement['id_name']] = $sub_sub_subelement['data'];
 960                                                                      break;
 961  
 962                                                                  case EBML_ID_TAGTRACKUID:
 963                                                                  case EBML_ID_TAGEDITIONUID:
 964                                                                  case EBML_ID_TAGCHAPTERUID:
 965                                                                  case EBML_ID_TAGATTACHMENTUID:
 966                                                                      $targets_entry[$sub_sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 967                                                                      break;
 968  
 969                                                                  default:
 970                                                                      $this->unhandledElement('tags.tag.targets', __LINE__, $sub_sub_subelement);
 971                                                                      break;
 972                                                              }
 973                                                          }
 974                                                          $tag_entry[$sub_subelement['id_name']] = $targets_entry;
 975                                                          break;
 976  
 977                                                      case EBML_ID_SIMPLETAG:
 978                                                          $tag_entry[$sub_subelement['id_name']][] = $this->HandleEMBLSimpleTag($sub_subelement['end']);
 979                                                          break;
 980  
 981                                                      default:
 982                                                          $this->unhandledElement('tags.tag', __LINE__, $sub_subelement);
 983                                                          break;
 984                                                  }
 985                                              }
 986                                              $tags_entry[] = $tag_entry;
 987                                              break;
 988  
 989                                          default:
 990                                              $this->unhandledElement('tags', __LINE__, $subelement);
 991                                              break;
 992                                      }
 993                                  }
 994                                  $info['matroska']['tags'] = $tags_entry;
 995                                  break;
 996  
 997                              case EBML_ID_ATTACHMENTS: // Contain attached files.
 998  
 999                                  while ($this->getEBMLelement($subelement, $element_data['end'])) {
1000                                      switch ($subelement['id']) {
1001  
1002                                          case EBML_ID_ATTACHEDFILE:
1003                                              $attachedfile_entry = array();
1004  
1005                                              while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_FILEDATA))) {
1006                                                  switch ($sub_subelement['id']) {
1007  
1008                                                      case EBML_ID_FILEDESCRIPTION:
1009                                                      case EBML_ID_FILENAME:
1010                                                      case EBML_ID_FILEMIMETYPE:
1011                                                          $attachedfile_entry[$sub_subelement['id_name']] = $sub_subelement['data'];
1012                                                          break;
1013  
1014                                                      case EBML_ID_FILEDATA:
1015                                                          $attachedfile_entry['data_offset'] = $this->current_offset;
1016                                                          $attachedfile_entry['data_length'] = $sub_subelement['length'];
1017  
1018                                                          $attachedfile_entry[$sub_subelement['id_name']] = $this->saveAttachment(
1019                                                              $attachedfile_entry['FileName'],
1020                                                              $attachedfile_entry['data_offset'],
1021                                                              $attachedfile_entry['data_length']);
1022  
1023                                                          $this->current_offset = $sub_subelement['end'];
1024                                                          break;
1025  
1026                                                      case EBML_ID_FILEUID:
1027                                                          $attachedfile_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1028                                                          break;
1029  
1030                                                      default:
1031                                                          $this->unhandledElement('attachments.attachedfile', __LINE__, $sub_subelement);
1032                                                          break;
1033                                                  }
1034                                              }
1035                                              $info['matroska']['attachments'][] = $attachedfile_entry;
1036                                              break;
1037  
1038                                          default:
1039                                              $this->unhandledElement('attachments', __LINE__, $subelement);
1040                                              break;
1041                                      }
1042                                  }
1043                                  break;
1044  
1045                              case EBML_ID_CHAPTERS:
1046  
1047                                  while ($this->getEBMLelement($subelement, $element_data['end'])) {
1048                                      switch ($subelement['id']) {
1049  
1050                                          case EBML_ID_EDITIONENTRY:
1051                                              $editionentry_entry = array();
1052  
1053                                              while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CHAPTERATOM))) {
1054                                                  switch ($sub_subelement['id']) {
1055  
1056                                                      case EBML_ID_EDITIONUID:
1057                                                          $editionentry_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1058                                                          break;
1059  
1060                                                      case EBML_ID_EDITIONFLAGHIDDEN:
1061                                                      case EBML_ID_EDITIONFLAGDEFAULT:
1062                                                      case EBML_ID_EDITIONFLAGORDERED:
1063                                                          $editionentry_entry[$sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_subelement['data']);
1064                                                          break;
1065  
1066                                                      case EBML_ID_CHAPTERATOM:
1067                                                          $chapteratom_entry = array();
1068  
1069                                                          while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], array(EBML_ID_CHAPTERTRACK, EBML_ID_CHAPTERDISPLAY))) {
1070                                                              switch ($sub_sub_subelement['id']) {
1071  
1072                                                                  case EBML_ID_CHAPTERSEGMENTUID:
1073                                                                  case EBML_ID_CHAPTERSEGMENTEDITIONUID:
1074                                                                      $chapteratom_entry[$sub_sub_subelement['id_name']] = $sub_sub_subelement['data'];
1075                                                                      break;
1076  
1077                                                                  case EBML_ID_CHAPTERFLAGENABLED:
1078                                                                  case EBML_ID_CHAPTERFLAGHIDDEN:
1079                                                                      $chapteratom_entry[$sub_sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
1080                                                                      break;
1081  
1082                                                                  case EBML_ID_CHAPTERUID:
1083                                                                  case EBML_ID_CHAPTERTIMESTART:
1084                                                                  case EBML_ID_CHAPTERTIMEEND:
1085                                                                      $chapteratom_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
1086                                                                      break;
1087  
1088                                                                  case EBML_ID_CHAPTERTRACK:
1089                                                                      $chaptertrack_entry = array();
1090  
1091                                                                      while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
1092                                                                          switch ($sub_sub_sub_subelement['id']) {
1093  
1094                                                                              case EBML_ID_CHAPTERTRACKNUMBER:
1095                                                                                  $chaptertrack_entry[$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
1096                                                                                  break;
1097  
1098                                                                              default:
1099                                                                                  $this->unhandledElement('chapters.editionentry.chapteratom.chaptertrack', __LINE__, $sub_sub_sub_subelement);
1100                                                                                  break;
1101                                                                          }
1102                                                                      }
1103                                                                      $chapteratom_entry[$sub_sub_subelement['id_name']][] = $chaptertrack_entry;
1104                                                                      break;
1105  
1106                                                                  case EBML_ID_CHAPTERDISPLAY:
1107                                                                      $chapterdisplay_entry = array();
1108  
1109                                                                      while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
1110                                                                          switch ($sub_sub_sub_subelement['id']) {
1111  
1112                                                                              case EBML_ID_CHAPSTRING:
1113                                                                              case EBML_ID_CHAPLANGUAGE:
1114                                                                              case EBML_ID_CHAPCOUNTRY:
1115                                                                                  $chapterdisplay_entry[$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
1116                                                                                  break;
1117  
1118                                                                              default:
1119                                                                                  $this->unhandledElement('chapters.editionentry.chapteratom.chapterdisplay', __LINE__, $sub_sub_sub_subelement);
1120                                                                                  break;
1121                                                                          }
1122                                                                      }
1123                                                                      $chapteratom_entry[$sub_sub_subelement['id_name']][] = $chapterdisplay_entry;
1124                                                                      break;
1125  
1126                                                                  default:
1127                                                                      $this->unhandledElement('chapters.editionentry.chapteratom', __LINE__, $sub_sub_subelement);
1128                                                                      break;
1129                                                              }
1130                                                          }
1131                                                          $editionentry_entry[$sub_subelement['id_name']][] = $chapteratom_entry;
1132                                                          break;
1133  
1134                                                      default:
1135                                                          $this->unhandledElement('chapters.editionentry', __LINE__, $sub_subelement);
1136                                                          break;
1137                                                  }
1138                                              }
1139                                              $info['matroska']['chapters'][] = $editionentry_entry;
1140                                              break;
1141  
1142                                          default:
1143                                              $this->unhandledElement('chapters', __LINE__, $subelement);
1144                                              break;
1145                                      }
1146                                  }
1147                                  break;
1148  
1149                              case EBML_ID_CLUSTER: // The lower level element containing the (monolithic) Block structure.
1150                                  $cluster_entry = array();
1151  
1152                                  while ($this->getEBMLelement($subelement, $element_data['end'], array(EBML_ID_CLUSTERSILENTTRACKS, EBML_ID_CLUSTERBLOCKGROUP, EBML_ID_CLUSTERSIMPLEBLOCK))) {
1153                                      switch ($subelement['id']) {
1154  
1155                                          case EBML_ID_CLUSTERTIMECODE:
1156                                          case EBML_ID_CLUSTERPOSITION:
1157                                          case EBML_ID_CLUSTERPREVSIZE:
1158                                              $cluster_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
1159                                              break;
1160  
1161                                          case EBML_ID_CLUSTERSILENTTRACKS:
1162                                              $cluster_silent_tracks = array();
1163  
1164                                              while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
1165                                                  switch ($sub_subelement['id']) {
1166  
1167                                                      case EBML_ID_CLUSTERSILENTTRACKNUMBER:
1168                                                          $cluster_silent_tracks[] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1169                                                          break;
1170  
1171                                                      default:
1172                                                          $this->unhandledElement('cluster.silenttracks', __LINE__, $sub_subelement);
1173                                                          break;
1174                                                  }
1175                                              }
1176                                              $cluster_entry[$subelement['id_name']][] = $cluster_silent_tracks;
1177                                              break;
1178  
1179                                          case EBML_ID_CLUSTERBLOCKGROUP:
1180                                              $cluster_block_group = array('offset' => $this->current_offset);
1181  
1182                                              while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CLUSTERBLOCK))) {
1183                                                  switch ($sub_subelement['id']) {
1184  
1185                                                      case EBML_ID_CLUSTERBLOCK:
1186                                                          $cluster_block_group[$sub_subelement['id_name']] = $this->HandleEMBLClusterBlock($sub_subelement, EBML_ID_CLUSTERBLOCK, $info);
1187                                                          break;
1188  
1189                                                      case EBML_ID_CLUSTERREFERENCEPRIORITY: // unsigned-int
1190                                                      case EBML_ID_CLUSTERBLOCKDURATION:     // unsigned-int
1191                                                          $cluster_block_group[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1192                                                          break;
1193  
1194                                                      case EBML_ID_CLUSTERREFERENCEBLOCK:    // signed-int
1195                                                          $cluster_block_group[$sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_subelement['data'], false, true);
1196                                                          break;
1197  
1198                                                      case EBML_ID_CLUSTERCODECSTATE:
1199                                                          $cluster_block_group[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
1200                                                          break;
1201  
1202                                                      default:
1203                                                          $this->unhandledElement('clusters.blockgroup', __LINE__, $sub_subelement);
1204                                                          break;
1205                                                  }
1206                                              }
1207                                              $cluster_entry[$subelement['id_name']][] = $cluster_block_group;
1208                                              break;
1209  
1210                                          case EBML_ID_CLUSTERSIMPLEBLOCK:
1211                                              $cluster_entry[$subelement['id_name']][] = $this->HandleEMBLClusterBlock($subelement, EBML_ID_CLUSTERSIMPLEBLOCK, $info);
1212                                              break;
1213  
1214                                          default:
1215                                              $this->unhandledElement('cluster', __LINE__, $subelement);
1216                                              break;
1217                                      }
1218                                      $this->current_offset = $subelement['end'];
1219                                  }
1220                                  if (!self::$hide_clusters) {
1221                                      $info['matroska']['cluster'][] = $cluster_entry;
1222                                  }
1223  
1224                                  // check to see if all the data we need exists already, if so, break out of the loop
1225                                  if (!self::$parse_whole_file) {
1226                                      if (isset($info['matroska']['info']) && is_array($info['matroska']['info'])) {
1227                                          if (isset($info['matroska']['tracks']['tracks']) && is_array($info['matroska']['tracks']['tracks'])) {
1228                                              if (count($info['matroska']['track_data_offsets']) == count($info['matroska']['tracks']['tracks'])) {
1229                                                  return;
1230                                              }
1231                                          }
1232                                      }
1233                                  }
1234                                  break;
1235  
1236                              default:
1237                                  $this->unhandledElement('segment', __LINE__, $element_data);
1238                                  break;
1239                          }
1240                      }
1241                      break;
1242  
1243                  default:
1244                      $this->unhandledElement('root', __LINE__, $top_element);
1245                      break;
1246              }
1247          }
1248      }
1249  
1250      /**
1251       * @param int $min_data
1252       *
1253       * @return bool
1254       */
1255  	private function EnsureBufferHasEnoughData($min_data=1024) {
1256          if (($this->current_offset - $this->EBMLbuffer_offset) >= ($this->EBMLbuffer_length - $min_data)) {
1257              $read_bytes = max($min_data, $this->getid3->fread_buffer_size());
1258  
1259              try {
1260                  $this->fseek($this->current_offset);
1261                  $this->EBMLbuffer_offset = $this->current_offset;
1262                  $this->EBMLbuffer        = $this->fread($read_bytes);
1263                  $this->EBMLbuffer_length = strlen($this->EBMLbuffer);
1264              } catch (getid3_exception $e) {
1265                  $this->warning('EBML parser: '.$e->getMessage());
1266                  return false;
1267              }
1268  
1269              if ($this->EBMLbuffer_length == 0 && $this->feof()) {
1270                  return $this->error('EBML parser: ran out of file at offset '.$this->current_offset);
1271              }
1272          }
1273          return true;
1274      }
1275  
1276      /**
1277       * @return int|float|false
1278       */
1279  	private function readEBMLint() {
1280          $actual_offset = $this->current_offset - $this->EBMLbuffer_offset;
1281  
1282          // get length of integer
1283          $first_byte_int = ord($this->EBMLbuffer[$actual_offset]);
1284          if       (0x80 & $first_byte_int) {
1285              $length = 1;
1286          } elseif (0x40 & $first_byte_int) {
1287              $length = 2;
1288          } elseif (0x20 & $first_byte_int) {
1289              $length = 3;
1290          } elseif (0x10 & $first_byte_int) {
1291              $length = 4;
1292          } elseif (0x08 & $first_byte_int) {
1293              $length = 5;
1294          } elseif (0x04 & $first_byte_int) {
1295              $length = 6;
1296          } elseif (0x02 & $first_byte_int) {
1297              $length = 7;
1298          } elseif (0x01 & $first_byte_int) {
1299              $length = 8;
1300          } else {
1301              throw new Exception('invalid EBML integer (leading 0x00) at '.$this->current_offset);
1302          }
1303  
1304          // read
1305          $int_value = self::EBML2Int(substr($this->EBMLbuffer, $actual_offset, $length));
1306          $this->current_offset += $length;
1307  
1308          return $int_value;
1309      }
1310  
1311      /**
1312       * @param int  $length
1313       * @param bool $check_buffer
1314       *
1315       * @return string|false
1316       */
1317  	private function readEBMLelementData($length, $check_buffer=false) {
1318          if ($check_buffer && !$this->EnsureBufferHasEnoughData($length)) {
1319              return false;
1320          }
1321          $data = substr($this->EBMLbuffer, $this->current_offset - $this->EBMLbuffer_offset, $length);
1322          $this->current_offset += $length;
1323          return $data;
1324      }
1325  
1326      /**
1327       * @param array      $element
1328       * @param int        $parent_end
1329       * @param array|bool $get_data
1330       *
1331       * @return bool
1332       */
1333  	private function getEBMLelement(&$element, $parent_end, $get_data=false) {
1334          if ($this->current_offset >= $parent_end) {
1335              return false;
1336          }
1337  
1338          if (!$this->EnsureBufferHasEnoughData()) {
1339              $this->current_offset = PHP_INT_MAX; // do not exit parser right now, allow to finish current loop to gather maximum information
1340              return false;
1341          }
1342  
1343          $element = array();
1344  
1345          // set offset
1346          $element['offset'] = $this->current_offset;
1347  
1348          // get ID
1349          $element['id'] = $this->readEBMLint();
1350  
1351          // get name
1352          $element['id_name'] = self::EBMLidName($element['id']);
1353  
1354          // get length
1355          $element['length'] = $this->readEBMLint();
1356  
1357          // get end offset
1358          $element['end'] = $this->current_offset + $element['length'];
1359  
1360          // get raw data
1361          $dont_parse = (in_array($element['id'], $this->unuseful_elements) || $element['id_name'] == dechex($element['id']));
1362          if (($get_data === true || (is_array($get_data) && !in_array($element['id'], $get_data))) && !$dont_parse) {
1363              $element['data'] = $this->readEBMLelementData($element['length'], $element);
1364          }
1365  
1366          return true;
1367      }
1368  
1369      /**
1370       * @param string $type
1371       * @param int    $line
1372       * @param array  $element
1373       */
1374  	private function unhandledElement($type, $line, $element) {
1375          // warn only about unknown and missed elements, not about unuseful
1376          if (!in_array($element['id'], $this->unuseful_elements)) {
1377              $this->warning('Unhandled '.$type.' element ['.basename(__FILE__).':'.$line.'] ('.$element['id'].'::'.$element['id_name'].' ['.$element['length'].' bytes]) at '.$element['offset']);
1378          }
1379  
1380          // increase offset for unparsed elements
1381          if (!isset($element['data'])) {
1382              $this->current_offset = $element['end'];
1383          }
1384      }
1385  
1386      /**
1387       * @param array $SimpleTagArray
1388       *
1389       * @return bool
1390       */
1391  	private function ExtractCommentsSimpleTag($SimpleTagArray) {
1392          if (!empty($SimpleTagArray['SimpleTag'])) {
1393              foreach ($SimpleTagArray['SimpleTag'] as $SimpleTagKey => $SimpleTagData) {
1394                  if (!empty($SimpleTagData['TagName']) && !empty($SimpleTagData['TagString'])) {
1395                      $this->getid3->info['matroska']['comments'][strtolower($SimpleTagData['TagName'])][] = $SimpleTagData['TagString'];
1396                  }
1397                  if (!empty($SimpleTagData['SimpleTag'])) {
1398                      $this->ExtractCommentsSimpleTag($SimpleTagData);
1399                  }
1400              }
1401          }
1402  
1403          return true;
1404      }
1405  
1406      /**
1407       * @param int $parent_end
1408       *
1409       * @return array
1410       */
1411  	private function HandleEMBLSimpleTag($parent_end) {
1412          $simpletag_entry = array();
1413  
1414          while ($this->getEBMLelement($element, $parent_end, array(EBML_ID_SIMPLETAG))) {
1415              switch ($element['id']) {
1416  
1417                  case EBML_ID_TAGNAME:
1418                  case EBML_ID_TAGLANGUAGE:
1419                  case EBML_ID_TAGSTRING:
1420                  case EBML_ID_TAGBINARY:
1421                      $simpletag_entry[$element['id_name']] = $element['data'];
1422                      break;
1423  
1424                  case EBML_ID_SIMPLETAG:
1425                      $simpletag_entry[$element['id_name']][] = $this->HandleEMBLSimpleTag($element['end']);
1426                      break;
1427  
1428                  case EBML_ID_TAGDEFAULT:
1429                      $simpletag_entry[$element['id_name']] = (bool)getid3_lib::BigEndian2Int($element['data']);
1430                      break;
1431  
1432                  default:
1433                      $this->unhandledElement('tag.simpletag', __LINE__, $element);
1434                      break;
1435              }
1436          }
1437  
1438          return $simpletag_entry;
1439      }
1440  
1441      /**
1442       * @param array $element
1443       * @param int   $block_type
1444       * @param array $info
1445       *
1446       * @return array
1447       */
1448  	private function HandleEMBLClusterBlock($element, $block_type, &$info) {
1449          // http://www.matroska.org/technical/specs/index.html#block_structure
1450          // http://www.matroska.org/technical/specs/index.html#simpleblock_structure
1451  
1452          $block_data = array();
1453          $block_data['tracknumber'] = $this->readEBMLint();
1454          $block_data['timecode']    = getid3_lib::BigEndian2Int($this->readEBMLelementData(2), false, true);
1455          $block_data['flags_raw']   = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));
1456  
1457          if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {
1458              $block_data['flags']['keyframe']  = (($block_data['flags_raw'] & 0x80) >> 7);
1459              //$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0x70) >> 4);
1460          }
1461          else {
1462              //$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0xF0) >> 4);
1463          }
1464          $block_data['flags']['invisible'] = (bool)(($block_data['flags_raw'] & 0x08) >> 3);
1465          $block_data['flags']['lacing']    =       (($block_data['flags_raw'] & 0x06) >> 1);  // 00=no lacing; 01=Xiph lacing; 11=EBML lacing; 10=fixed-size lacing
1466          if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {
1467              $block_data['flags']['discardable'] = (($block_data['flags_raw'] & 0x01));
1468          }
1469          else {
1470              //$block_data['flags']['reserved2'] = (($block_data['flags_raw'] & 0x01) >> 0);
1471          }
1472          $block_data['flags']['lacing_type'] = self::BlockLacingType($block_data['flags']['lacing']);
1473  
1474          // Lace (when lacing bit is set)
1475          if ($block_data['flags']['lacing'] > 0) {
1476              $block_data['lace_frames'] = getid3_lib::BigEndian2Int($this->readEBMLelementData(1)) + 1; // Number of frames in the lace-1 (uint8)
1477              if ($block_data['flags']['lacing'] != 0x02) {
1478                  for ($i = 1; $i < $block_data['lace_frames']; $i ++) { // Lace-coded size of each frame of the lace, except for the last one (multiple uint8). *This is not used with Fixed-size lacing as it is calculated automatically from (total size of lace) / (number of frames in lace).
1479                      if ($block_data['flags']['lacing'] == 0x03) { // EBML lacing
1480                          $block_data['lace_frames_size'][$i] = $this->readEBMLint(); // TODO: read size correctly, calc size for the last frame. For now offsets are deteminded OK with readEBMLint() and that's the most important thing.
1481                      }
1482                      else { // Xiph lacing
1483                          $block_data['lace_frames_size'][$i] = 0;
1484                          do {
1485                              $size = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));
1486                              $block_data['lace_frames_size'][$i] += $size;
1487                          }
1488                          while ($size == 255);
1489                      }
1490                  }
1491                  if ($block_data['flags']['lacing'] == 0x01) { // calc size of the last frame only for Xiph lacing, till EBML sizes are now anyway determined incorrectly
1492                      $block_data['lace_frames_size'][] = $element['end'] - $this->current_offset - array_sum($block_data['lace_frames_size']);
1493                  }
1494              }
1495          }
1496  
1497          if (!isset($info['matroska']['track_data_offsets'][$block_data['tracknumber']])) {
1498              $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['offset'] = $this->current_offset;
1499              $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'] = $element['end'] - $this->current_offset;
1500              //$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] = 0;
1501          }
1502          //$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] += $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'];
1503          //$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['duration']      = $block_data['timecode'] * ((isset($info['matroska']['info'][0]['TimecodeScale']) ? $info['matroska']['info'][0]['TimecodeScale'] : 1000000) / 1000000000);
1504  
1505          // set offset manually
1506          $this->current_offset = $element['end'];
1507  
1508          return $block_data;
1509      }
1510  
1511      /**
1512       * @param string $EBMLstring
1513       *
1514       * @return int|float|false
1515       */
1516  	private static function EBML2Int($EBMLstring) {
1517          // http://matroska.org/specs/
1518  
1519          // Element ID coded with an UTF-8 like system:
1520          // 1xxx xxxx                                  - Class A IDs (2^7 -2 possible values) (base 0x8X)
1521          // 01xx xxxx  xxxx xxxx                       - Class B IDs (2^14-2 possible values) (base 0x4X 0xXX)
1522          // 001x xxxx  xxxx xxxx  xxxx xxxx            - Class C IDs (2^21-2 possible values) (base 0x2X 0xXX 0xXX)
1523          // 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - Class D IDs (2^28-2 possible values) (base 0x1X 0xXX 0xXX 0xXX)
1524          // Values with all x at 0 and 1 are reserved (hence the -2).
1525  
1526          // Data size, in octets, is also coded with an UTF-8 like system :
1527          // 1xxx xxxx                                                                              - value 0 to  2^7-2
1528          // 01xx xxxx  xxxx xxxx                                                                   - value 0 to 2^14-2
1529          // 001x xxxx  xxxx xxxx  xxxx xxxx                                                        - value 0 to 2^21-2
1530          // 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                             - value 0 to 2^28-2
1531          // 0000 1xxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                  - value 0 to 2^35-2
1532          // 0000 01xx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                       - value 0 to 2^42-2
1533          // 0000 001x  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx            - value 0 to 2^49-2
1534          // 0000 0001  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - value 0 to 2^56-2
1535  
1536          $first_byte_int = ord($EBMLstring[0]);
1537          if (0x80 & $first_byte_int) {
1538              $EBMLstring[0] = chr($first_byte_int & 0x7F);
1539          } elseif (0x40 & $first_byte_int) {
1540              $EBMLstring[0] = chr($first_byte_int & 0x3F);
1541          } elseif (0x20 & $first_byte_int) {
1542              $EBMLstring[0] = chr($first_byte_int & 0x1F);
1543          } elseif (0x10 & $first_byte_int) {
1544              $EBMLstring[0] = chr($first_byte_int & 0x0F);
1545          } elseif (0x08 & $first_byte_int) {
1546              $EBMLstring[0] = chr($first_byte_int & 0x07);
1547          } elseif (0x04 & $first_byte_int) {
1548              $EBMLstring[0] = chr($first_byte_int & 0x03);
1549          } elseif (0x02 & $first_byte_int) {
1550              $EBMLstring[0] = chr($first_byte_int & 0x01);
1551          } elseif (0x01 & $first_byte_int) {
1552              $EBMLstring[0] = chr($first_byte_int & 0x00);
1553          }
1554  
1555          return getid3_lib::BigEndian2Int($EBMLstring);
1556      }
1557  
1558      /**
1559       * @param int $EBMLdatestamp
1560       *
1561       * @return float
1562       */
1563  	private static function EBMLdate2unix($EBMLdatestamp) {
1564          // Date - signed 8 octets integer in nanoseconds with 0 indicating the precise beginning of the millennium (at 2001-01-01T00:00:00,000000000 UTC)
1565          // 978307200 == mktime(0, 0, 0, 1, 1, 2001) == January 1, 2001 12:00:00am UTC
1566          return round(($EBMLdatestamp / 1000000000) + 978307200);
1567      }
1568  
1569      /**
1570       * @param int $target_type
1571       *
1572       * @return string|int
1573       */
1574  	public static function TargetTypeValue($target_type) {
1575          // http://www.matroska.org/technical/specs/tagging/index.html
1576          static $TargetTypeValue = array();
1577          if (empty($TargetTypeValue)) {
1578              $TargetTypeValue[10] = 'A: ~ V:shot';                                           // the lowest hierarchy found in music or movies
1579              $TargetTypeValue[20] = 'A:subtrack/part/movement ~ V:scene';                    // corresponds to parts of a track for audio (like a movement)
1580              $TargetTypeValue[30] = 'A:track/song ~ V:chapter';                              // the common parts of an album or a movie
1581              $TargetTypeValue[40] = 'A:part/session ~ V:part/session';                       // when an album or episode has different logical parts
1582              $TargetTypeValue[50] = 'A:album/opera/concert ~ V:movie/episode/concert';       // the most common grouping level of music and video (equals to an episode for TV series)
1583              $TargetTypeValue[60] = 'A:edition/issue/volume/opus ~ V:season/sequel/volume';  // a list of lower levels grouped together
1584              $TargetTypeValue[70] = 'A:collection ~ V:collection';                           // the high hierarchy consisting of many different lower items
1585          }
1586          return (isset($TargetTypeValue[$target_type]) ? $TargetTypeValue[$target_type] : $target_type);
1587      }
1588  
1589      /**
1590       * @param int $lacingtype
1591       *
1592       * @return string|int
1593       */
1594  	public static function BlockLacingType($lacingtype) {
1595          // http://matroska.org/technical/specs/index.html#block_structure
1596          static $BlockLacingType = array();
1597          if (empty($BlockLacingType)) {
1598              $BlockLacingType[0x00] = 'no lacing';
1599              $BlockLacingType[0x01] = 'Xiph lacing';
1600              $BlockLacingType[0x02] = 'fixed-size lacing';
1601              $BlockLacingType[0x03] = 'EBML lacing';
1602          }
1603          return (isset($BlockLacingType[$lacingtype]) ? $BlockLacingType[$lacingtype] : $lacingtype);
1604      }
1605  
1606      /**
1607       * @param string $codecid
1608       *
1609       * @return string
1610       */
1611  	public static function CodecIDtoCommonName($codecid) {
1612          // http://www.matroska.org/technical/specs/codecid/index.html
1613          static $CodecIDlist = array();
1614          if (empty($CodecIDlist)) {
1615              $CodecIDlist['A_AAC']            = 'aac';
1616              $CodecIDlist['A_AAC/MPEG2/LC']   = 'aac';
1617              $CodecIDlist['A_AC3']            = 'ac3';
1618              $CodecIDlist['A_EAC3']           = 'eac3';
1619              $CodecIDlist['A_DTS']            = 'dts';
1620              $CodecIDlist['A_FLAC']           = 'flac';
1621              $CodecIDlist['A_MPEG/L1']        = 'mp1';
1622              $CodecIDlist['A_MPEG/L2']        = 'mp2';
1623              $CodecIDlist['A_MPEG/L3']        = 'mp3';
1624              $CodecIDlist['A_PCM/INT/LIT']    = 'pcm';       // PCM Integer Little Endian
1625              $CodecIDlist['A_PCM/INT/BIG']    = 'pcm';       // PCM Integer Big Endian
1626              $CodecIDlist['A_QUICKTIME/QDMC'] = 'quicktime'; // Quicktime: QDesign Music
1627              $CodecIDlist['A_QUICKTIME/QDM2'] = 'quicktime'; // Quicktime: QDesign Music v2
1628              $CodecIDlist['A_VORBIS']         = 'vorbis';
1629              $CodecIDlist['V_MPEG1']          = 'mpeg';
1630              $CodecIDlist['V_THEORA']         = 'theora';
1631              $CodecIDlist['V_REAL/RV40']      = 'real';
1632              $CodecIDlist['V_REAL/RV10']      = 'real';
1633              $CodecIDlist['V_REAL/RV20']      = 'real';
1634              $CodecIDlist['V_REAL/RV30']      = 'real';
1635              $CodecIDlist['V_QUICKTIME']      = 'quicktime'; // Quicktime
1636              $CodecIDlist['V_MPEG4/ISO/AP']   = 'mpeg4';
1637              $CodecIDlist['V_MPEG4/ISO/ASP']  = 'mpeg4';
1638              $CodecIDlist['V_MPEG4/ISO/AVC']  = 'h264';
1639              $CodecIDlist['V_MPEG4/ISO/SP']   = 'mpeg4';
1640              $CodecIDlist['V_VP8']            = 'vp8';
1641              $CodecIDlist['V_MS/VFW/FOURCC']  = 'vcm'; // Microsoft (TM) Video Codec Manager (VCM)
1642              $CodecIDlist['A_MS/ACM']         = 'acm'; // Microsoft (TM) Audio Codec Manager (ACM)
1643          }
1644          return (isset($CodecIDlist[$codecid]) ? $CodecIDlist[$codecid] : $codecid);
1645      }
1646  
1647      /**
1648       * @param int $value
1649       *
1650       * @return string
1651       */
1652  	private static function EBMLidName($value) {
1653          static $EBMLidList = array();
1654          if (empty($EBMLidList)) {
1655              $EBMLidList[EBML_ID_ASPECTRATIOTYPE]            = 'AspectRatioType';
1656              $EBMLidList[EBML_ID_ATTACHEDFILE]               = 'AttachedFile';
1657              $EBMLidList[EBML_ID_ATTACHMENTLINK]             = 'AttachmentLink';
1658              $EBMLidList[EBML_ID_ATTACHMENTS]                = 'Attachments';
1659              $EBMLidList[EBML_ID_AUDIO]                      = 'Audio';
1660              $EBMLidList[EBML_ID_BITDEPTH]                   = 'BitDepth';
1661              $EBMLidList[EBML_ID_CHANNELPOSITIONS]           = 'ChannelPositions';
1662              $EBMLidList[EBML_ID_CHANNELS]                   = 'Channels';
1663              $EBMLidList[EBML_ID_CHAPCOUNTRY]                = 'ChapCountry';
1664              $EBMLidList[EBML_ID_CHAPLANGUAGE]               = 'ChapLanguage';
1665              $EBMLidList[EBML_ID_CHAPPROCESS]                = 'ChapProcess';
1666              $EBMLidList[EBML_ID_CHAPPROCESSCODECID]         = 'ChapProcessCodecID';
1667              $EBMLidList[EBML_ID_CHAPPROCESSCOMMAND]         = 'ChapProcessCommand';
1668              $EBMLidList[EBML_ID_CHAPPROCESSDATA]            = 'ChapProcessData';
1669              $EBMLidList[EBML_ID_CHAPPROCESSPRIVATE]         = 'ChapProcessPrivate';
1670              $EBMLidList[EBML_ID_CHAPPROCESSTIME]            = 'ChapProcessTime';
1671              $EBMLidList[EBML_ID_CHAPSTRING]                 = 'ChapString';
1672              $EBMLidList[EBML_ID_CHAPTERATOM]                = 'ChapterAtom';
1673              $EBMLidList[EBML_ID_CHAPTERDISPLAY]             = 'ChapterDisplay';
1674              $EBMLidList[EBML_ID_CHAPTERFLAGENABLED]         = 'ChapterFlagEnabled';
1675              $EBMLidList[EBML_ID_CHAPTERFLAGHIDDEN]          = 'ChapterFlagHidden';
1676              $EBMLidList[EBML_ID_CHAPTERPHYSICALEQUIV]       = 'ChapterPhysicalEquiv';
1677              $EBMLidList[EBML_ID_CHAPTERS]                   = 'Chapters';
1678              $EBMLidList[EBML_ID_CHAPTERSEGMENTEDITIONUID]   = 'ChapterSegmentEditionUID';
1679              $EBMLidList[EBML_ID_CHAPTERSEGMENTUID]          = 'ChapterSegmentUID';
1680              $EBMLidList[EBML_ID_CHAPTERTIMEEND]             = 'ChapterTimeEnd';
1681              $EBMLidList[EBML_ID_CHAPTERTIMESTART]           = 'ChapterTimeStart';
1682              $EBMLidList[EBML_ID_CHAPTERTRACK]               = 'ChapterTrack';
1683              $EBMLidList[EBML_ID_CHAPTERTRACKNUMBER]         = 'ChapterTrackNumber';
1684              $EBMLidList[EBML_ID_CHAPTERTRANSLATE]           = 'ChapterTranslate';
1685              $EBMLidList[EBML_ID_CHAPTERTRANSLATECODEC]      = 'ChapterTranslateCodec';
1686              $EBMLidList[EBML_ID_CHAPTERTRANSLATEEDITIONUID] = 'ChapterTranslateEditionUID';
1687              $EBMLidList[EBML_ID_CHAPTERTRANSLATEID]         = 'ChapterTranslateID';
1688              $EBMLidList[EBML_ID_CHAPTERUID]                 = 'ChapterUID';
1689              $EBMLidList[EBML_ID_CLUSTER]                    = 'Cluster';
1690              $EBMLidList[EBML_ID_CLUSTERBLOCK]               = 'ClusterBlock';
1691              $EBMLidList[EBML_ID_CLUSTERBLOCKADDID]          = 'ClusterBlockAddID';
1692              $EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONAL]     = 'ClusterBlockAdditional';
1693              $EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONID]     = 'ClusterBlockAdditionID';
1694              $EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONS]      = 'ClusterBlockAdditions';
1695              $EBMLidList[EBML_ID_CLUSTERBLOCKDURATION]       = 'ClusterBlockDuration';
1696              $EBMLidList[EBML_ID_CLUSTERBLOCKGROUP]          = 'ClusterBlockGroup';
1697              $EBMLidList[EBML_ID_CLUSTERBLOCKMORE]           = 'ClusterBlockMore';
1698              $EBMLidList[EBML_ID_CLUSTERBLOCKVIRTUAL]        = 'ClusterBlockVirtual';
1699              $EBMLidList[EBML_ID_CLUSTERCODECSTATE]          = 'ClusterCodecState';
1700              $EBMLidList[EBML_ID_CLUSTERDELAY]               = 'ClusterDelay';
1701              $EBMLidList[EBML_ID_CLUSTERDURATION]            = 'ClusterDuration';
1702              $EBMLidList[EBML_ID_CLUSTERENCRYPTEDBLOCK]      = 'ClusterEncryptedBlock';
1703              $EBMLidList[EBML_ID_CLUSTERFRAMENUMBER]         = 'ClusterFrameNumber';
1704              $EBMLidList[EBML_ID_CLUSTERLACENUMBER]          = 'ClusterLaceNumber';
1705              $EBMLidList[EBML_ID_CLUSTERPOSITION]            = 'ClusterPosition';
1706              $EBMLidList[EBML_ID_CLUSTERPREVSIZE]            = 'ClusterPrevSize';
1707              $EBMLidList[EBML_ID_CLUSTERREFERENCEBLOCK]      = 'ClusterReferenceBlock';
1708              $EBMLidList[EBML_ID_CLUSTERREFERENCEPRIORITY]   = 'ClusterReferencePriority';
1709              $EBMLidList[EBML_ID_CLUSTERREFERENCEVIRTUAL]    = 'ClusterReferenceVirtual';
1710              $EBMLidList[EBML_ID_CLUSTERSILENTTRACKNUMBER]   = 'ClusterSilentTrackNumber';
1711              $EBMLidList[EBML_ID_CLUSTERSILENTTRACKS]        = 'ClusterSilentTracks';
1712              $EBMLidList[EBML_ID_CLUSTERSIMPLEBLOCK]         = 'ClusterSimpleBlock';
1713              $EBMLidList[EBML_ID_CLUSTERTIMECODE]            = 'ClusterTimecode';
1714              $EBMLidList[EBML_ID_CLUSTERTIMESLICE]           = 'ClusterTimeSlice';
1715              $EBMLidList[EBML_ID_CODECDECODEALL]             = 'CodecDecodeAll';
1716              $EBMLidList[EBML_ID_CODECDOWNLOADURL]           = 'CodecDownloadURL';
1717              $EBMLidList[EBML_ID_CODECID]                    = 'CodecID';
1718              $EBMLidList[EBML_ID_CODECINFOURL]               = 'CodecInfoURL';
1719              $EBMLidList[EBML_ID_CODECNAME]                  = 'CodecName';
1720              $EBMLidList[EBML_ID_CODECPRIVATE]               = 'CodecPrivate';
1721              $EBMLidList[EBML_ID_CODECSETTINGS]              = 'CodecSettings';
1722              $EBMLidList[EBML_ID_COLOURSPACE]                = 'ColourSpace';
1723              $EBMLidList[EBML_ID_CONTENTCOMPALGO]            = 'ContentCompAlgo';
1724              $EBMLidList[EBML_ID_CONTENTCOMPRESSION]         = 'ContentCompression';
1725              $EBMLidList[EBML_ID_CONTENTCOMPSETTINGS]        = 'ContentCompSettings';
1726              $EBMLidList[EBML_ID_CONTENTENCALGO]             = 'ContentEncAlgo';
1727              $EBMLidList[EBML_ID_CONTENTENCKEYID]            = 'ContentEncKeyID';
1728              $EBMLidList[EBML_ID_CONTENTENCODING]            = 'ContentEncoding';
1729              $EBMLidList[EBML_ID_CONTENTENCODINGORDER]       = 'ContentEncodingOrder';
1730              $EBMLidList[EBML_ID_CONTENTENCODINGS]           = 'ContentEncodings';
1731              $EBMLidList[EBML_ID_CONTENTENCODINGSCOPE]       = 'ContentEncodingScope';
1732              $EBMLidList[EBML_ID_CONTENTENCODINGTYPE]        = 'ContentEncodingType';
1733              $EBMLidList[EBML_ID_CONTENTENCRYPTION]          = 'ContentEncryption';
1734              $EBMLidList[EBML_ID_CONTENTSIGALGO]             = 'ContentSigAlgo';
1735              $EBMLidList[EBML_ID_CONTENTSIGHASHALGO]         = 'ContentSigHashAlgo';
1736              $EBMLidList[EBML_ID_CONTENTSIGKEYID]            = 'ContentSigKeyID';
1737              $EBMLidList[EBML_ID_CONTENTSIGNATURE]           = 'ContentSignature';
1738              $EBMLidList[EBML_ID_CRC32]                      = 'CRC32';
1739              $EBMLidList[EBML_ID_CUEBLOCKNUMBER]             = 'CueBlockNumber';
1740              $EBMLidList[EBML_ID_CUECLUSTERPOSITION]         = 'CueClusterPosition';
1741              $EBMLidList[EBML_ID_CUECODECSTATE]              = 'CueCodecState';
1742              $EBMLidList[EBML_ID_CUEPOINT]                   = 'CuePoint';
1743              $EBMLidList[EBML_ID_CUEREFCLUSTER]              = 'CueRefCluster';
1744              $EBMLidList[EBML_ID_CUEREFCODECSTATE]           = 'CueRefCodecState';
1745              $EBMLidList[EBML_ID_CUEREFERENCE]               = 'CueReference';
1746              $EBMLidList[EBML_ID_CUEREFNUMBER]               = 'CueRefNumber';
1747              $EBMLidList[EBML_ID_CUEREFTIME]                 = 'CueRefTime';
1748              $EBMLidList[EBML_ID_CUES]                       = 'Cues';
1749              $EBMLidList[EBML_ID_CUETIME]                    = 'CueTime';
1750              $EBMLidList[EBML_ID_CUETRACK]                   = 'CueTrack';
1751              $EBMLidList[EBML_ID_CUETRACKPOSITIONS]          = 'CueTrackPositions';
1752              $EBMLidList[EBML_ID_DATEUTC]                    = 'DateUTC';
1753              $EBMLidList[EBML_ID_DEFAULTDURATION]            = 'DefaultDuration';
1754              $EBMLidList[EBML_ID_DISPLAYHEIGHT]              = 'DisplayHeight';
1755              $EBMLidList[EBML_ID_DISPLAYUNIT]                = 'DisplayUnit';
1756              $EBMLidList[EBML_ID_DISPLAYWIDTH]               = 'DisplayWidth';
1757              $EBMLidList[EBML_ID_DOCTYPE]                    = 'DocType';
1758              $EBMLidList[EBML_ID_DOCTYPEREADVERSION]         = 'DocTypeReadVersion';
1759              $EBMLidList[EBML_ID_DOCTYPEVERSION]             = 'DocTypeVersion';
1760              $EBMLidList[EBML_ID_DURATION]                   = 'Duration';
1761              $EBMLidList[EBML_ID_EBML]                       = 'EBML';
1762              $EBMLidList[EBML_ID_EBMLMAXIDLENGTH]            = 'EBMLMaxIDLength';
1763              $EBMLidList[EBML_ID_EBMLMAXSIZELENGTH]          = 'EBMLMaxSizeLength';
1764              $EBMLidList[EBML_ID_EBMLREADVERSION]            = 'EBMLReadVersion';
1765              $EBMLidList[EBML_ID_EBMLVERSION]                = 'EBMLVersion';
1766              $EBMLidList[EBML_ID_EDITIONENTRY]               = 'EditionEntry';
1767              $EBMLidList[EBML_ID_EDITIONFLAGDEFAULT]         = 'EditionFlagDefault';
1768              $EBMLidList[EBML_ID_EDITIONFLAGHIDDEN]          = 'EditionFlagHidden';
1769              $EBMLidList[EBML_ID_EDITIONFLAGORDERED]         = 'EditionFlagOrdered';
1770              $EBMLidList[EBML_ID_EDITIONUID]                 = 'EditionUID';
1771              $EBMLidList[EBML_ID_FILEDATA]                   = 'FileData';
1772              $EBMLidList[EBML_ID_FILEDESCRIPTION]            = 'FileDescription';
1773              $EBMLidList[EBML_ID_FILEMIMETYPE]               = 'FileMimeType';
1774              $EBMLidList[EBML_ID_FILENAME]                   = 'FileName';
1775              $EBMLidList[EBML_ID_FILEREFERRAL]               = 'FileReferral';
1776              $EBMLidList[EBML_ID_FILEUID]                    = 'FileUID';
1777              $EBMLidList[EBML_ID_FLAGDEFAULT]                = 'FlagDefault';
1778              $EBMLidList[EBML_ID_FLAGENABLED]                = 'FlagEnabled';
1779              $EBMLidList[EBML_ID_FLAGFORCED]                 = 'FlagForced';
1780              $EBMLidList[EBML_ID_FLAGINTERLACED]             = 'FlagInterlaced';
1781              $EBMLidList[EBML_ID_FLAGLACING]                 = 'FlagLacing';
1782              $EBMLidList[EBML_ID_GAMMAVALUE]                 = 'GammaValue';
1783              $EBMLidList[EBML_ID_INFO]                       = 'Info';
1784              $EBMLidList[EBML_ID_LANGUAGE]                   = 'Language';
1785              $EBMLidList[EBML_ID_MAXBLOCKADDITIONID]         = 'MaxBlockAdditionID';
1786              $EBMLidList[EBML_ID_MAXCACHE]                   = 'MaxCache';
1787              $EBMLidList[EBML_ID_MINCACHE]                   = 'MinCache';
1788              $EBMLidList[EBML_ID_MUXINGAPP]                  = 'MuxingApp';
1789              $EBMLidList[EBML_ID_NAME]                       = 'Name';
1790              $EBMLidList[EBML_ID_NEXTFILENAME]               = 'NextFilename';
1791              $EBMLidList[EBML_ID_NEXTUID]                    = 'NextUID';
1792              $EBMLidList[EBML_ID_OUTPUTSAMPLINGFREQUENCY]    = 'OutputSamplingFrequency';
1793              $EBMLidList[EBML_ID_PIXELCROPBOTTOM]            = 'PixelCropBottom';
1794              $EBMLidList[EBML_ID_PIXELCROPLEFT]              = 'PixelCropLeft';
1795              $EBMLidList[EBML_ID_PIXELCROPRIGHT]             = 'PixelCropRight';
1796              $EBMLidList[EBML_ID_PIXELCROPTOP]               = 'PixelCropTop';
1797              $EBMLidList[EBML_ID_PIXELHEIGHT]                = 'PixelHeight';
1798              $EBMLidList[EBML_ID_PIXELWIDTH]                 = 'PixelWidth';
1799              $EBMLidList[EBML_ID_PREVFILENAME]               = 'PrevFilename';
1800              $EBMLidList[EBML_ID_PREVUID]                    = 'PrevUID';
1801              $EBMLidList[EBML_ID_SAMPLINGFREQUENCY]          = 'SamplingFrequency';
1802              $EBMLidList[EBML_ID_SEEK]                       = 'Seek';
1803              $EBMLidList[EBML_ID_SEEKHEAD]                   = 'SeekHead';
1804              $EBMLidList[EBML_ID_SEEKID]                     = 'SeekID';
1805              $EBMLidList[EBML_ID_SEEKPOSITION]               = 'SeekPosition';
1806              $EBMLidList[EBML_ID_SEGMENT]                    = 'Segment';
1807              $EBMLidList[EBML_ID_SEGMENTFAMILY]              = 'SegmentFamily';
1808              $EBMLidList[EBML_ID_SEGMENTFILENAME]            = 'SegmentFilename';
1809              $EBMLidList[EBML_ID_SEGMENTUID]                 = 'SegmentUID';
1810              $EBMLidList[EBML_ID_SIMPLETAG]                  = 'SimpleTag';
1811              $EBMLidList[EBML_ID_CLUSTERSLICES]              = 'ClusterSlices';
1812              $EBMLidList[EBML_ID_STEREOMODE]                 = 'StereoMode';
1813              $EBMLidList[EBML_ID_OLDSTEREOMODE]              = 'OldStereoMode';
1814              $EBMLidList[EBML_ID_TAG]                        = 'Tag';
1815              $EBMLidList[EBML_ID_TAGATTACHMENTUID]           = 'TagAttachmentUID';
1816              $EBMLidList[EBML_ID_TAGBINARY]                  = 'TagBinary';
1817              $EBMLidList[EBML_ID_TAGCHAPTERUID]              = 'TagChapterUID';
1818              $EBMLidList[EBML_ID_TAGDEFAULT]                 = 'TagDefault';
1819              $EBMLidList[EBML_ID_TAGEDITIONUID]              = 'TagEditionUID';
1820              $EBMLidList[EBML_ID_TAGLANGUAGE]                = 'TagLanguage';
1821              $EBMLidList[EBML_ID_TAGNAME]                    = 'TagName';
1822              $EBMLidList[EBML_ID_TAGTRACKUID]                = 'TagTrackUID';
1823              $EBMLidList[EBML_ID_TAGS]                       = 'Tags';
1824              $EBMLidList[EBML_ID_TAGSTRING]                  = 'TagString';
1825              $EBMLidList[EBML_ID_TARGETS]                    = 'Targets';
1826              $EBMLidList[EBML_ID_TARGETTYPE]                 = 'TargetType';
1827              $EBMLidList[EBML_ID_TARGETTYPEVALUE]            = 'TargetTypeValue';
1828              $EBMLidList[EBML_ID_TIMECODESCALE]              = 'TimecodeScale';
1829              $EBMLidList[EBML_ID_TITLE]                      = 'Title';
1830              $EBMLidList[EBML_ID_TRACKENTRY]                 = 'TrackEntry';
1831              $EBMLidList[EBML_ID_TRACKNUMBER]                = 'TrackNumber';
1832              $EBMLidList[EBML_ID_TRACKOFFSET]                = 'TrackOffset';
1833              $EBMLidList[EBML_ID_TRACKOVERLAY]               = 'TrackOverlay';
1834              $EBMLidList[EBML_ID_TRACKS]                     = 'Tracks';
1835              $EBMLidList[EBML_ID_TRACKTIMECODESCALE]         = 'TrackTimecodeScale';
1836              $EBMLidList[EBML_ID_TRACKTRANSLATE]             = 'TrackTranslate';
1837              $EBMLidList[EBML_ID_TRACKTRANSLATECODEC]        = 'TrackTranslateCodec';
1838              $EBMLidList[EBML_ID_TRACKTRANSLATEEDITIONUID]   = 'TrackTranslateEditionUID';
1839              $EBMLidList[EBML_ID_TRACKTRANSLATETRACKID]      = 'TrackTranslateTrackID';
1840              $EBMLidList[EBML_ID_TRACKTYPE]                  = 'TrackType';
1841              $EBMLidList[EBML_ID_TRACKUID]                   = 'TrackUID';
1842              $EBMLidList[EBML_ID_VIDEO]                      = 'Video';
1843              $EBMLidList[EBML_ID_VOID]                       = 'Void';
1844              $EBMLidList[EBML_ID_WRITINGAPP]                 = 'WritingApp';
1845          }
1846  
1847          return (isset($EBMLidList[$value]) ? $EBMLidList[$value] : dechex($value));
1848      }
1849  
1850      /**
1851       * @param int $value
1852       *
1853       * @return string
1854       */
1855  	public static function displayUnit($value) {
1856          // http://www.matroska.org/technical/specs/index.html#DisplayUnit
1857          static $units = array(
1858              0 => 'pixels',
1859              1 => 'centimeters',
1860              2 => 'inches',
1861              3 => 'Display Aspect Ratio');
1862  
1863          return (isset($units[$value]) ? $units[$value] : 'unknown');
1864      }
1865  
1866      /**
1867       * @param array $streams
1868       *
1869       * @return array
1870       */
1871  	private static function getDefaultStreamInfo($streams)
1872      {
1873          $stream = array();
1874          foreach (array_reverse($streams) as $stream) {
1875              if ($stream['default']) {
1876                  break;
1877              }
1878          }
1879  
1880          $unset = array('default', 'name');
1881          foreach ($unset as $u) {
1882              if (isset($stream[$u])) {
1883                  unset($stream[$u]);
1884              }
1885          }
1886  
1887          $info = $stream;
1888          $info['streams'] = $streams;
1889  
1890          return $info;
1891      }
1892  
1893  }


Generated: Thu Sep 19 01:00:03 2019 Cross-referenced by PHPXref 0.7.1