├── .gitignore ├── LICENSE.md ├── README.md ├── ebml.go ├── elements.go ├── gomkvinfo └── main.go ├── parser.go └── utils.go /.gitignore: -------------------------------------------------------------------------------- 1 | *.webm 2 | *.swp 3 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # go-mkv 2 | 3 | Matroska/WebM parsing for the Go Programming Language. 4 | 5 | ## Example 6 | 7 | ```go 8 | file, err := os.Open("video.webm") 9 | if err != nil { 10 | fmt.Fprintf(os.Stderr, "%s\n", err) 11 | return 12 | } 13 | 14 | defer file.Close() 15 | 16 | doc := mkv.InitDocument(file) 17 | err = doc.ParseAll(func(el mkv.Element) { 18 | fmt.Printf("Element %s - %d bytes\n", el.Name, el.Size) 19 | }) 20 | 21 | if err != nil { 22 | fmt.Fprintf(os.Stderr, "%s\n", err) 23 | return 24 | } 25 | ``` 26 | -------------------------------------------------------------------------------- /ebml.go: -------------------------------------------------------------------------------- 1 | package mkv 2 | 3 | import ( 4 | "io" 5 | ) 6 | 7 | // Document represents a WebM file 8 | type Document struct { 9 | r io.Reader 10 | } 11 | 12 | // ElementRegister contains the ID, type and name of the 13 | // standard WebM/Matroska elements 14 | type ElementRegister struct { 15 | ID uint32 16 | Type uint8 17 | Name string 18 | } 19 | 20 | // Element is a Matroska/WebM/EBML element 21 | type Element struct { 22 | ElementRegister 23 | 24 | Parent *Element 25 | Level int32 26 | Size uint64 27 | Content []byte // Data contained in the element, nil if it is a master element 28 | Bytes []byte // Whole binary representation of the element (nil if data is missing) 29 | } 30 | -------------------------------------------------------------------------------- /elements.go: -------------------------------------------------------------------------------- 1 | package mkv 2 | 3 | const ( 4 | ElementType uint8 = 0x0 5 | ElementTypeUnknown uint8 = 0x0 6 | ElementTypeMaster uint8 = 0x1 7 | ElementTypeUint uint8 = 0x2 8 | ElementTypeInt uint8 = 0x3 9 | ElementTypeString uint8 = 0x4 10 | ElementTypeUnicode uint8 = 0x5 11 | ElementTypeBinary uint8 = 0x6 12 | ElementTypeFloat uint8 = 0x7 13 | ElementTypeDate uint8 = 0x8 14 | ) 15 | 16 | var ( 17 | ElementUnknown = ElementRegister{0x0, ElementTypeUnknown, "Unknown"} 18 | ElementEBML = ElementRegister{0x1a45dfa3, ElementTypeMaster, "EBML"} 19 | ElementEBMLVersion = ElementRegister{0x4286, ElementTypeUint, "EBMLVersion"} 20 | ElementEBMLReadVersion = ElementRegister{0x42f7, ElementTypeUint, "EBMLReadVersion"} 21 | ElementEBMLMaxIDLength = ElementRegister{0x42f2, ElementTypeUint, "EBMLMaxIDLength"} 22 | ElementEBMLMaxSizeLength = ElementRegister{0x42f3, ElementTypeUint, "EBMLMaxSizeLength"} 23 | ElementDocType = ElementRegister{0x4282, ElementTypeString, "DocType"} 24 | ElementDocTypeVersion = ElementRegister{0x4287, ElementTypeUint, "DocTypeVersion"} 25 | ElementDocTypeReadVersion = ElementRegister{0x4285, ElementTypeUint, "DocTypeReadVersion"} 26 | ElementVoid = ElementRegister{0xec, ElementTypeBinary, "Void"} 27 | ElementCRC32 = ElementRegister{0xbf, ElementTypeBinary, "CRC-32"} 28 | ElementSegment = ElementRegister{0x18538067, ElementTypeMaster, "Segment"} 29 | ElementSeekHead = ElementRegister{0x114d9b74, ElementTypeMaster, "SeekHead"} 30 | ElementSeek = ElementRegister{0x4dbb, ElementTypeMaster, "Seek"} 31 | ElementSeekID = ElementRegister{0x53ab, ElementTypeBinary, "SeekID"} 32 | ElementSeekPosition = ElementRegister{0x53ac, ElementTypeUint, "SeekPosition"} 33 | ElementInfo = ElementRegister{0x1549a966, ElementTypeMaster, "Info"} 34 | ElementSegmentUID = ElementRegister{0x73a4, ElementTypeBinary, "SegmentUID"} 35 | ElementSegmentFilename = ElementRegister{0x7384, ElementTypeUnicode, "SegmentFilename"} 36 | ElementPrevUID = ElementRegister{0x3cb923, ElementTypeBinary, "PrevUID"} 37 | ElementPrevFilename = ElementRegister{0x3c83ab, ElementTypeUnicode, "PrevFilename"} 38 | ElementNextUID = ElementRegister{0x3eb923, ElementTypeBinary, "NextUID"} 39 | ElementNextFilename = ElementRegister{0x3e83bb, ElementTypeUnicode, "NextFilename"} 40 | ElementSegmentFamily = ElementRegister{0x4444, ElementTypeBinary, "SegmentFamily"} 41 | ElementChapterTranslate = ElementRegister{0x6924, ElementTypeMaster, "ChapterTranslate"} 42 | ElementChapterTranslateEditionUID = ElementRegister{0x69fc, ElementTypeUint, "ChapterTranslateEditionUID"} 43 | ElementChapterTranslateCodec = ElementRegister{0x69bf, ElementTypeUint, "ChapterTranslateCodec"} 44 | ElementChapterTranslateID = ElementRegister{0x69a5, ElementTypeBinary, "ChapterTranslateID"} 45 | ElementTimecodeScale = ElementRegister{0x2ad7b1, ElementTypeUint, "TimecodeScale"} 46 | ElementDuration = ElementRegister{0x4489, ElementTypeFloat, "Duration"} 47 | ElementDateUTC = ElementRegister{0x4461, ElementTypeDate, "DateUTC"} 48 | ElementTitle = ElementRegister{0x7ba9, ElementTypeUnicode, "Title"} 49 | ElementMuxingApp = ElementRegister{0x4d80, ElementTypeUnicode, "MuxingApp"} 50 | ElementWritingApp = ElementRegister{0x5741, ElementTypeUnicode, "WritingApp"} 51 | ElementCluster = ElementRegister{0x1f43b675, ElementTypeMaster, "Cluster"} 52 | ElementTimecode = ElementRegister{0xe7, ElementTypeUint, "Timecode"} 53 | ElementSlientTracks = ElementRegister{0x5854, ElementTypeMaster, "SlientTracks"} 54 | ElementSlientTrackNumber = ElementRegister{0x58d7, ElementTypeUint, "SlientTrackNumber"} 55 | ElementPosition = ElementRegister{0xa7, ElementTypeUint, "Position"} 56 | ElementPrevSize = ElementRegister{0xab, ElementTypeUint, "PrevSize"} 57 | ElementSimpleBlock = ElementRegister{0xa3, ElementTypeBinary, "SimpleBlock"} 58 | ElementBlockGroup = ElementRegister{0xa0, ElementTypeMaster, "BlockGroup"} 59 | ElementBlock = ElementRegister{0xa1, ElementTypeBinary, "Block"} 60 | ElementBlockAdditions = ElementRegister{0x75a1, ElementTypeMaster, "BlockAdditions"} 61 | ElementBlockMore = ElementRegister{0xa6, ElementTypeMaster, "BlockMore"} 62 | ElementBlockAddID = ElementRegister{0xee, ElementTypeUint, "BlockAddID"} 63 | ElementBlockAdditional = ElementRegister{0xa5, ElementTypeBinary, "BlockAdditional"} 64 | ElementBlockDuration = ElementRegister{0x9b, ElementTypeUint, "BlockDuration"} 65 | ElementReferencePriority = ElementRegister{0xfa, ElementTypeUint, "ReferencePriority"} 66 | ElementReferenceBlock = ElementRegister{0xfb, ElementTypeInt, "ReferenceBlock"} 67 | ElementCodecState = ElementRegister{0xa4, ElementTypeBinary, "CodecState"} 68 | ElementDiscardPadding = ElementRegister{0x75a2, ElementTypeInt, "DiscardPadding"} 69 | ElementSlices = ElementRegister{0x8e, ElementTypeMaster, "Slices"} 70 | ElementTimeSlice = ElementRegister{0xe8, ElementTypeMaster, "TimeSlice"} 71 | ElementLaceNumber = ElementRegister{0xcc, ElementTypeUint, "LaceNumber"} 72 | ElementTracks = ElementRegister{0x1654ae6b, ElementTypeMaster, "Tracks"} 73 | ElementTrackEntry = ElementRegister{0xae, ElementTypeMaster, "TrackEntry"} 74 | ElementTrackNumber = ElementRegister{0xd7, ElementTypeUint, "TrackNumber"} 75 | ElementTrackUID = ElementRegister{0x73c5, ElementTypeUint, "TrackUID"} 76 | ElementTrackType = ElementRegister{0x83, ElementTypeUint, "TrackType"} 77 | ElementFlagEnabled = ElementRegister{0xb9, ElementTypeUint, "FlagEnabled"} 78 | ElementFlagDefault = ElementRegister{0x88, ElementTypeUint, "FlagDefault"} 79 | ElementFlagForced = ElementRegister{0x55aa, ElementTypeUint, "FlagForced"} 80 | ElementFlagLacing = ElementRegister{0x9c, ElementTypeUint, "FlagLacing"} 81 | ElementMinCache = ElementRegister{0x6de7, ElementTypeUint, "MinCache"} 82 | ElementMaxCache = ElementRegister{0x6df8, ElementTypeUint, "MaxCache"} 83 | ElementDefaultDuration = ElementRegister{0x23e383, ElementTypeUint, "DefaultDuration"} 84 | ElementDefaultDecodedFieldDuration = ElementRegister{0x234e7a, ElementTypeUint, "DefaultDecodedFieldDuration"} 85 | ElementMaxBlockAdditionID = ElementRegister{0x55ee, ElementTypeUint, "MaxBlockAdditionID"} 86 | ElementName = ElementRegister{0x536e, ElementTypeUnicode, "Name"} 87 | ElementLanguage = ElementRegister{0x22b59c, ElementTypeString, "Language"} 88 | ElementCodecID = ElementRegister{0x86, ElementTypeString, "CodecID"} 89 | ElementCodecPrivate = ElementRegister{0x63a2, ElementTypeBinary, "CodecPrivate"} 90 | ElementCodecName = ElementRegister{0x258688, ElementTypeUnicode, "CodecName"} 91 | ElementAttachmentLink = ElementRegister{0x7446, ElementTypeUint, "AttachmentLink"} 92 | ElementCodecDecodeAll = ElementRegister{0xaa, ElementTypeUint, "CodecDecodeAll"} 93 | ElementTrackOverlay = ElementRegister{0x6fab, ElementTypeUint, "TrackOverlay"} 94 | ElementCodecDelay = ElementRegister{0x56aa, ElementTypeUint, "CodecDelay"} 95 | ElementSeekPreRoll = ElementRegister{0x56bb, ElementTypeUint, "SeekPreRoll"} 96 | ElementTrackTranslate = ElementRegister{0x6624, ElementTypeMaster, "TrackTranslate"} 97 | ElementTrackTranslateEditionUID = ElementRegister{0x66fc, ElementTypeUint, "TrackTranslateEditionUID"} 98 | ElementTrackTranslateCodec = ElementRegister{0x66bf, ElementTypeUint, "TrackTranslateCodec"} 99 | ElementTrackTranslateTrackID = ElementRegister{0x66a5, ElementTypeBinary, "TrackTranslateTrackID"} 100 | ElementVideo = ElementRegister{0xe0, ElementTypeMaster, "Video"} 101 | ElementFlagInterlaced = ElementRegister{0x9a, ElementTypeUint, "FlagInterlaced"} 102 | ElementStereoMode = ElementRegister{0x53b8, ElementTypeUint, "StereoMode"} 103 | ElementAlphaMode = ElementRegister{0x53c0, ElementTypeUint, "AlphaMode"} 104 | ElementPixelWidth = ElementRegister{0xb0, ElementTypeUint, "PixelWidth"} 105 | ElementPixelHeight = ElementRegister{0xba, ElementTypeUint, "PixelHeight"} 106 | ElementPixelCropBottom = ElementRegister{0x54aa, ElementTypeUint, "PixelCropBottom"} 107 | ElementPixelCropTop = ElementRegister{0x54bb, ElementTypeUint, "PixelCropTop"} 108 | ElementPixelCropLeft = ElementRegister{0x54cc, ElementTypeUint, "PixelCropLeft"} 109 | ElementPixelCropRight = ElementRegister{0x54dd, ElementTypeUint, "PixelCropRight"} 110 | ElementDisplayWidth = ElementRegister{0x54b0, ElementTypeUint, "DisplayWidth"} 111 | ElementDisplayHeight = ElementRegister{0x54ba, ElementTypeUint, "DisplayHeight"} 112 | ElementDisplayUint = ElementRegister{0x54b2, ElementTypeUint, "DisplayUint"} 113 | ElementAspectRatioType = ElementRegister{0x54b3, ElementTypeUint, "AspectRatioType"} 114 | ElementColourSpace = ElementRegister{0x2eb524, ElementTypeBinary, "ColourSpace"} 115 | ElementAudio = ElementRegister{0xe1, ElementTypeMaster, "Audio"} 116 | ElementSamplingFrequency = ElementRegister{0xb5, ElementTypeFloat, "SamplingFrequency"} 117 | ElementOutputSamplingFrequency = ElementRegister{0x78b5, ElementTypeFloat, "OutputSamplingFrequency"} 118 | ElementChannels = ElementRegister{0x9f, ElementTypeUint, "Channels"} 119 | ElementBitDepth = ElementRegister{0x6264, ElementTypeUint, "BitDepth"} 120 | ElementTrackOperation = ElementRegister{0xe2, ElementTypeMaster, "TrackOperation"} 121 | ElementTrackCombinePlanes = ElementRegister{0xe3, ElementTypeMaster, "TrackCombinePlanes"} 122 | ElementTrackPlane = ElementRegister{0xe4, ElementTypeMaster, "TrackPlane"} 123 | ElementTrackPlaneUID = ElementRegister{0xe5, ElementTypeUint, "TrackPlaneUID"} 124 | ElementTrackPlaneType = ElementRegister{0xe6, ElementTypeUint, "TrackPlaneType"} 125 | ElementTrackJoinBlocks = ElementRegister{0xe9, ElementTypeMaster, "TrackJoinBlocks"} 126 | ElementTrackJoinUID = ElementRegister{0xed, ElementTypeUint, "TrackJoinUID"} 127 | ElementContentEncodings = ElementRegister{0x6d80, ElementTypeMaster, "ContentEncodings"} 128 | ElementContentEncoding = ElementRegister{0x6240, ElementTypeMaster, "ContentEncoding"} 129 | ElementContentEncodingOrder = ElementRegister{0x5031, ElementTypeUint, "ContentEncodingOrder"} 130 | ElementContentEncodingScope = ElementRegister{0x5032, ElementTypeUint, "ContentEncodingScope"} 131 | ElementContentEncodingType = ElementRegister{0x5033, ElementTypeUint, "ContentEncodingType"} 132 | ElementContentCompression = ElementRegister{0x5034, ElementTypeMaster, "ContentCompression"} 133 | ElementContentCompAlgo = ElementRegister{0x4254, ElementTypeUint, "ContentCompAlgo"} 134 | ElementContentCompSettings = ElementRegister{0x4255, ElementTypeBinary, "ContentCompSettings"} 135 | ElementContentEncryption = ElementRegister{0x5035, ElementTypeMaster, "ContentEncryption"} 136 | ElementContentEncAlgo = ElementRegister{0x47e1, ElementTypeUint, "ContentEncAlgo"} 137 | ElementContentEncKeyID = ElementRegister{0x47e2, ElementTypeUint, "ContentEncKeyID"} 138 | ElementContentSignature = ElementRegister{0x47e3, ElementTypeBinary, "ContentSignature"} 139 | ElementContentSigKeyID = ElementRegister{0x47e4, ElementTypeBinary, "ContentSigKeyID"} 140 | ElementContentSigAlgo = ElementRegister{0x47e5, ElementTypeUint, "ContentSigAlgo"} 141 | ElementContentSigHashAlgo = ElementRegister{0x47e6, ElementTypeUint, "ContentSigHashAlgo"} 142 | ElementCues = ElementRegister{0x1c53bb6b, ElementTypeMaster, "Cues"} 143 | ElementCuePoint = ElementRegister{0xbb, ElementTypeMaster, "CuePoint"} 144 | ElementCueTime = ElementRegister{0xb3, ElementTypeUint, "CueTime"} 145 | ElementCueTrackPositions = ElementRegister{0xb7, ElementTypeMaster, "CueTrackPositions"} 146 | ElementCueTrack = ElementRegister{0xf7, ElementTypeUint, "CueTrack"} 147 | ElementCueClusterPosition = ElementRegister{0xf1, ElementTypeUint, "CueClusterPosition"} 148 | ElementCueRelativePosition = ElementRegister{0xf0, ElementTypeUint, "CueRelativePosition"} 149 | ElementCueDuration = ElementRegister{0xb2, ElementTypeUint, "CueDuration"} 150 | ElementCueBlockNumber = ElementRegister{0x5378, ElementTypeUint, "CueBlockNumber"} 151 | ElementCueCodecState = ElementRegister{0xea, ElementTypeUint, "CueCodecState"} 152 | ElementCueReference = ElementRegister{0xdb, ElementTypeMaster, "CueReference"} 153 | ElementCueRefTime = ElementRegister{0x96, ElementTypeUint, "CueRefTime"} 154 | ElementAttachments = ElementRegister{0x1941a469, ElementTypeMaster, "Attachments"} 155 | ElementAttachedFile = ElementRegister{0x61a7, ElementTypeMaster, "AttachedFile"} 156 | ElementFileDescription = ElementRegister{0x467e, ElementTypeUnicode, "FileDescription"} 157 | ElementFileName = ElementRegister{0x466e, ElementTypeUnicode, "FileName"} 158 | ElementFileMimeType = ElementRegister{0x6460, ElementTypeString, "FileMimeType"} 159 | ElementFileData = ElementRegister{0x465c, ElementTypeBinary, "FileData"} 160 | ElementFileUID = ElementRegister{0x46ae, ElementTypeUint, "FileUID"} 161 | ElementChapters = ElementRegister{0x1043a770, ElementTypeMaster, "Chapters"} 162 | ElementEditionEntry = ElementRegister{0x45b9, ElementTypeMaster, "EditionEntry"} 163 | ElementEditionUID = ElementRegister{0x45bc, ElementTypeUint, "EditionUID"} 164 | ElementEditionFlagHidden = ElementRegister{0x45bd, ElementTypeUint, "EditionFlagHidden"} 165 | ElementEditionFlagDefault = ElementRegister{0x45db, ElementTypeUint, "EditionFlagDefault"} 166 | ElementEditionFlagOrdered = ElementRegister{0x45dd, ElementTypeUint, "EditionFlagOrdered"} 167 | ElementChapterAtom = ElementRegister{0xb6, ElementTypeMaster, "ChapterAtom"} 168 | ElementChapterUID = ElementRegister{0x73c4, ElementTypeUint, "ChapterUID"} 169 | ElementChapterStringUID = ElementRegister{0x5654, ElementTypeUnicode, "ChapterStringUID"} 170 | ElementChapterTimeStart = ElementRegister{0x91, ElementTypeUint, "ChapterTimeStart"} 171 | ElementChapterTimeEnd = ElementRegister{0x92, ElementTypeUint, "ChapterTimeEnd"} 172 | ElementChapterFlagHidden = ElementRegister{0x98, ElementTypeUint, "ChapterFlagHidden"} 173 | ElementChapterFlagEnabled = ElementRegister{0x4598, ElementTypeUint, "ChapterFlagEnabled"} 174 | ElementChapterSegmentUID = ElementRegister{0x6e67, ElementTypeBinary, "ChapterSegmentUID"} 175 | ElementChapterSegmentEditionUID = ElementRegister{0x6ebc, ElementTypeUint, "ChapterSegmentEditionUID"} 176 | ElementChapterPhysicalEquiv = ElementRegister{0x63c3, ElementTypeUint, "ChapterPhysicalEquiv"} 177 | ElementChapterTrack = ElementRegister{0x8f, ElementTypeMaster, "ChapterTrack"} 178 | ElementChapterTrackNumber = ElementRegister{0x89, ElementTypeUint, "ChapterTrackNumber"} 179 | ElementChapterDisplay = ElementRegister{0x80, ElementTypeMaster, "ChapterDisplay"} 180 | ElementChapString = ElementRegister{0x85, ElementTypeUnicode, "ChapString"} 181 | ElementChapLanguage = ElementRegister{0x437c, ElementTypeString, "ChapLanguage"} 182 | ElementChapCountry = ElementRegister{0x437e, ElementTypeString, "ChapCountry"} 183 | ElementChapProcess = ElementRegister{0x6944, ElementTypeMaster, "ChapProcess"} 184 | ElementChapProcessCodecID = ElementRegister{0x6955, ElementTypeUint, "ChapProcessCodecID"} 185 | ElementChapProcessPrivate = ElementRegister{0x450d, ElementTypeBinary, "ChapProcessPrivate"} 186 | ElementChapProcessCommand = ElementRegister{0x6911, ElementTypeMaster, "ChapProcessCommand"} 187 | ElementChapProcessTime = ElementRegister{0x6922, ElementTypeUint, "ChapProcessTime"} 188 | ElementChapProcessData = ElementRegister{0x6933, ElementTypeBinary, "ChapProcessData"} 189 | 190 | // TODO: Add tags 191 | ) 192 | 193 | // GetElementRegister returns the infos concerning the provided element ID 194 | func GetElementRegister(id uint32) ElementRegister { 195 | switch id { 196 | case ElementEBML.ID: 197 | return ElementEBML 198 | case ElementEBMLVersion.ID: 199 | return ElementEBMLVersion 200 | case ElementEBMLReadVersion.ID: 201 | return ElementEBMLReadVersion 202 | case ElementEBMLMaxIDLength.ID: 203 | return ElementEBMLMaxIDLength 204 | case ElementEBMLMaxSizeLength.ID: 205 | return ElementEBMLMaxSizeLength 206 | case ElementDocType.ID: 207 | return ElementDocType 208 | case ElementDocTypeVersion.ID: 209 | return ElementDocTypeVersion 210 | case ElementDocTypeReadVersion.ID: 211 | return ElementDocTypeReadVersion 212 | case ElementVoid.ID: 213 | return ElementVoid 214 | case ElementCRC32.ID: 215 | return ElementCRC32 216 | case ElementSegment.ID: 217 | return ElementSegment 218 | case ElementSeekHead.ID: 219 | return ElementSeekHead 220 | case ElementSeek.ID: 221 | return ElementSeek 222 | case ElementSeekID.ID: 223 | return ElementSeekID 224 | case ElementSeekPosition.ID: 225 | return ElementSeekPosition 226 | case ElementInfo.ID: 227 | return ElementInfo 228 | case ElementTimecodeScale.ID: 229 | return ElementTimecodeScale 230 | case ElementDuration.ID: 231 | return ElementDuration 232 | case ElementDateUTC.ID: 233 | return ElementDateUTC 234 | case ElementTitle.ID: 235 | return ElementTitle 236 | case ElementMuxingApp.ID: 237 | return ElementMuxingApp 238 | case ElementWritingApp.ID: 239 | return ElementWritingApp 240 | case ElementCluster.ID: 241 | return ElementCluster 242 | case ElementTimecode.ID: 243 | return ElementTimecode 244 | case ElementPrevSize.ID: 245 | return ElementPrevSize 246 | case ElementSimpleBlock.ID: 247 | return ElementSimpleBlock 248 | case ElementBlockGroup.ID: 249 | return ElementBlockGroup 250 | case ElementBlock.ID: 251 | return ElementBlock 252 | case ElementBlockAdditions.ID: 253 | return ElementBlockAdditions 254 | case ElementBlockMore.ID: 255 | return ElementBlockMore 256 | case ElementBlockAddID.ID: 257 | return ElementBlockAddID 258 | case ElementBlockAdditional.ID: 259 | return ElementBlockAdditional 260 | case ElementBlockDuration.ID: 261 | return ElementBlockDuration 262 | case ElementReferenceBlock.ID: 263 | return ElementReferenceBlock 264 | case ElementDiscardPadding.ID: 265 | return ElementDiscardPadding 266 | case ElementTracks.ID: 267 | return ElementTracks 268 | case ElementTrackEntry.ID: 269 | return ElementTrackEntry 270 | case ElementTrackNumber.ID: 271 | return ElementTrackNumber 272 | case ElementTrackUID.ID: 273 | return ElementTrackUID 274 | case ElementTrackType.ID: 275 | return ElementTrackType 276 | case ElementFlagEnabled.ID: 277 | return ElementFlagEnabled 278 | case ElementFlagDefault.ID: 279 | return ElementFlagDefault 280 | case ElementFlagForced.ID: 281 | return ElementFlagForced 282 | case ElementFlagLacing.ID: 283 | return ElementFlagLacing 284 | case ElementDefaultDuration.ID: 285 | return ElementDefaultDuration 286 | case ElementName.ID: 287 | return ElementName 288 | case ElementLanguage.ID: 289 | return ElementLanguage 290 | case ElementCodecID.ID: 291 | return ElementCodecID 292 | case ElementCodecPrivate.ID: 293 | return ElementCodecPrivate 294 | case ElementCodecName.ID: 295 | return ElementCodecName 296 | case ElementCodecDelay.ID: 297 | return ElementCodecDelay 298 | case ElementSeekPreRoll.ID: 299 | return ElementSeekPreRoll 300 | case ElementVideo.ID: 301 | return ElementVideo 302 | case ElementFlagInterlaced.ID: 303 | return ElementFlagInterlaced 304 | case ElementStereoMode.ID: 305 | return ElementStereoMode 306 | case ElementAlphaMode.ID: 307 | return ElementAlphaMode 308 | case ElementPixelWidth.ID: 309 | return ElementPixelWidth 310 | case ElementPixelHeight.ID: 311 | return ElementPixelHeight 312 | case ElementPixelCropBottom.ID: 313 | return ElementPixelCropBottom 314 | case ElementPixelCropTop.ID: 315 | return ElementPixelCropTop 316 | case ElementPixelCropLeft.ID: 317 | return ElementPixelCropLeft 318 | case ElementPixelCropRight.ID: 319 | return ElementPixelCropRight 320 | case ElementDisplayWidth.ID: 321 | return ElementDisplayWidth 322 | case ElementDisplayHeight.ID: 323 | return ElementDisplayHeight 324 | case ElementDisplayUint.ID: 325 | return ElementDisplayUint 326 | case ElementAspectRatioType.ID: 327 | return ElementAspectRatioType 328 | case ElementAudio.ID: 329 | return ElementAudio 330 | case ElementSamplingFrequency.ID: 331 | return ElementSamplingFrequency 332 | case ElementOutputSamplingFrequency.ID: 333 | return ElementOutputSamplingFrequency 334 | case ElementChannels.ID: 335 | return ElementChannels 336 | case ElementBitDepth.ID: 337 | return ElementBitDepth 338 | case ElementContentEncodings.ID: 339 | return ElementContentEncodings 340 | case ElementContentEncoding.ID: 341 | return ElementContentEncoding 342 | case ElementContentEncodingOrder.ID: 343 | return ElementContentEncodingOrder 344 | case ElementContentEncodingScope.ID: 345 | return ElementContentEncodingScope 346 | case ElementContentEncodingType.ID: 347 | return ElementContentEncodingType 348 | case ElementContentEncryption.ID: 349 | return ElementContentEncryption 350 | case ElementContentEncAlgo.ID: 351 | return ElementContentEncAlgo 352 | case ElementContentEncKeyID.ID: 353 | return ElementContentEncKeyID 354 | case ElementUnknown.ID: 355 | return ElementUnknown 356 | default: 357 | return ElementUnknown 358 | } 359 | } 360 | -------------------------------------------------------------------------------- /gomkvinfo/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "os" 6 | 7 | "github.com/quadrifoglio/go-mkv" 8 | ) 9 | 10 | func main() { 11 | fmt.Println("go-mkv") 12 | 13 | if len(os.Args) <= 1 { 14 | fmt.Fprintf(os.Stderr, "Usage: gomkvinfo [options] \n") 15 | os.Exit(1) 16 | } 17 | 18 | file, err := os.Open(os.Args[1]) 19 | if err != nil { 20 | fmt.Fprintf(os.Stderr, "%s\n", err) 21 | os.Exit(1) 22 | } 23 | 24 | defer file.Close() 25 | 26 | doc := mkv.InitDocument(file) 27 | err = doc.ParseAll(func(el mkv.Element) { 28 | fmt.Printf("Element %s - %d bytes\n", el.Name, el.Size) 29 | }) 30 | 31 | if err != nil { 32 | fmt.Fprintf(os.Stderr, "%s\n", err) 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /parser.go: -------------------------------------------------------------------------------- 1 | package mkv 2 | 3 | import ( 4 | "errors" 5 | "io" 6 | ) 7 | 8 | var ( 9 | ErrParse = errors.New("Parse error") 10 | ErrUnexpectedEOF = errors.New("Unexpected EOF") 11 | ) 12 | 13 | // InitDocument creates a MKV/WebM document containing the file data 14 | // It does not do any parsing 15 | func InitDocument(r io.Reader) *Document { 16 | doc := new(Document) 17 | doc.r = r 18 | 19 | return doc 20 | } 21 | 22 | // ParseAll parses the entire MKV/WebM document 23 | // When an EBML/WebM element is encountered, it calls the provided function 24 | // and passes the newly parsed element 25 | func (doc *Document) ParseAll(c func(Element)) error { 26 | for { 27 | el, err := doc.ParseElement() 28 | if err != nil { 29 | return err 30 | } 31 | 32 | c(el) 33 | } 34 | 35 | return nil 36 | } 37 | 38 | // ParseElement parses an EBML element starting at the document's current cursor position. 39 | // Because of its nature, it does not set the elements's parent or level. 40 | func (doc *Document) ParseElement() (Element, error) { 41 | var el Element 42 | 43 | id, err := doc.GetElementID(&el) 44 | if err != nil { 45 | return el, err 46 | } 47 | 48 | size, err := doc.GetElementSize(&el) 49 | if err != nil { 50 | return el, err 51 | } 52 | 53 | reg := GetElementRegister(id) 54 | el.ID = reg.ID 55 | el.Type = reg.Type 56 | el.Name = reg.Name 57 | el.Size = size 58 | 59 | if el.Type != ElementTypeMaster { 60 | d, err := doc.GetElementContent(&el) 61 | if err != nil { 62 | return el, err 63 | } 64 | 65 | el.Content = d 66 | } 67 | 68 | return el, nil 69 | } 70 | 71 | // GetElementID tries to parse the next element's id, 72 | // starting from the document's current cursor position. 73 | func (doc *Document) GetElementID(el *Element) (uint32, error) { 74 | b := make([]byte, 1) 75 | 76 | _, err := io.ReadFull(doc.r, b) 77 | if err != nil { 78 | return 0, err 79 | } 80 | 81 | if ((b[0] & 0x80) >> 7) == 1 { // Class A ID (on 1 byte) 82 | el.Bytes = append(el.Bytes, b[0]) 83 | return uint32(b[0]), nil 84 | } 85 | if ((b[0] & 0x40) >> 6) == 1 { // Class B ID (on 2 byte) 86 | bb := make([]byte, 2) 87 | copy(bb, b) 88 | 89 | _, err = io.ReadFull(doc.r, bb[1:]) 90 | if err != nil { 91 | return 0, err 92 | } 93 | 94 | el.Bytes = append(el.Bytes, bb...) 95 | return uint32(pack(2, bb)), nil 96 | } 97 | if ((b[0] & 0x20) >> 5) == 1 { // Class C ID (on 3 bytes) 98 | bb := make([]byte, 3) 99 | copy(bb, b) 100 | 101 | _, err = io.ReadFull(doc.r, bb[1:]) 102 | if err != nil { 103 | return 0, err 104 | } 105 | 106 | el.Bytes = append(el.Bytes, bb...) 107 | return uint32(pack(3, bb)), nil 108 | } 109 | if ((b[0] & 0x10) >> 4) == 1 { // Class D ID (on 4 bytes) 110 | bb := make([]byte, 4) 111 | copy(bb, b) 112 | 113 | _, err = io.ReadFull(doc.r, bb[1:]) 114 | if err != nil { 115 | return 0, err 116 | } 117 | 118 | el.Bytes = append(el.Bytes, bb...) 119 | return uint32(pack(4, bb)), nil 120 | } 121 | 122 | return 0, ErrParse 123 | } 124 | 125 | // GetElementSize tries to parse the next element's size, 126 | // starting from the document's current cursor position. 127 | func (doc *Document) GetElementSize(el *Element) (uint64, error) { 128 | b := make([]byte, 1) 129 | 130 | _, err := io.ReadFull(doc.r, b) 131 | if err != nil { 132 | return 0, err 133 | } 134 | 135 | var mask byte 136 | var length uint64 137 | 138 | if b[0] >= 0x80 { 139 | length = 1 140 | mask = 0x7f 141 | } else if b[0] >= 0x40 { 142 | length = 2 143 | mask = 0x3f 144 | } else if b[0] >= 0x20 { 145 | length = 3 146 | mask = 0x1f 147 | } else if b[0] >= 0x10 { 148 | length = 4 149 | mask = 0x0f 150 | } else if b[0] >= 0x08 { 151 | length = 5 152 | mask = 0x07 153 | } else if b[0] >= 0x04 { 154 | length = 6 155 | mask = 0x03 156 | } else if b[0] >= 0x02 { 157 | length = 7 158 | mask = 0x01 159 | } else if b[0] >= 0x01 { 160 | length = 8 161 | mask = 0x00 162 | } else { 163 | return 0, ErrParse 164 | } 165 | 166 | bb := make([]byte, length) 167 | bb[0] = b[0] 168 | 169 | if length > 1 { 170 | _, err = io.ReadFull(doc.r, bb[1:]) 171 | if err != nil { 172 | return 0, err 173 | } 174 | } 175 | 176 | el.Bytes = append(el.Bytes, bb...) 177 | 178 | bb[0] &= mask 179 | v := pack(int(length), bb) 180 | 181 | return v, nil 182 | } 183 | 184 | // GetElementContent returns the element's data (if any) 185 | // Data is present if the element's type is not Master 186 | func (doc *Document) GetElementContent(el *Element) ([]byte, error) { 187 | buf := make([]byte, el.Size) 188 | 189 | _, err := io.ReadFull(doc.r, buf) 190 | if err != nil { 191 | return nil, err 192 | } 193 | 194 | el.Bytes = append(el.Bytes, buf...) 195 | return buf, nil 196 | } 197 | -------------------------------------------------------------------------------- /utils.go: -------------------------------------------------------------------------------- 1 | package mkv 2 | 3 | func pack(n int, b []byte) uint64 { 4 | var v uint64 5 | var k uint64 = (uint64(n) - 1) * 8 6 | 7 | for i := 0; i < n; i++ { 8 | v |= uint64(b[i]) << k 9 | k -= 8 10 | } 11 | 12 | return v 13 | } 14 | 15 | func unpack(n int, v uint64) []byte { 16 | var b []byte 17 | 18 | for i := uint(n); i > 0; i-- { 19 | b = append(b, byte(v>>(8*i))&0xff) 20 | } 21 | 22 | return b 23 | } 24 | --------------------------------------------------------------------------------