1 // Copyright (c) 2010 The WebM project authors. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the LICENSE file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 9 10 #include "EbmlBufferWriter.h" 11 #include "EbmlIDs.h" 12 #include "WebMElement.h" 13 #include <stdio.h> 14 15 #define kVorbisPrivateMaxSize 4000 16 17 void writeHeader(EbmlGlobal *glob) 18 { 19 EbmlLoc start; 20 Ebml_StartSubElement(glob, &start, EBML); 21 Ebml_SerializeUnsigned(glob, EBMLVersion, 1); 22 Ebml_SerializeUnsigned(glob, EBMLReadVersion, 1); //EBML Read Version 23 Ebml_SerializeUnsigned(glob, EBMLMaxIDLength, 4); //EBML Max ID Length 24 Ebml_SerializeUnsigned(glob, EBMLMaxSizeLength, 8); //EBML Max Size Length 25 Ebml_SerializeString(glob, DocType, "webm"); //Doc Type 26 Ebml_SerializeUnsigned(glob, DocTypeVersion, 2); //Doc Type Version 27 Ebml_SerializeUnsigned(glob, DocTypeReadVersion, 2); //Doc Type Read Version 28 Ebml_EndSubElement(glob, &start); 29 } 30 31 void writeSimpleBlock(EbmlGlobal *glob, unsigned char trackNumber, short timeCode, 32 int isKeyframe, unsigned char lacingFlag, int discardable, 33 unsigned char *data, unsigned long dataLength) 34 { 35 Ebml_WriteID(glob, SimpleBlock); 36 unsigned long blockLength = 4 + dataLength; 37 blockLength |= 0x10000000; //TODO check length < 0x0FFFFFFFF 38 Ebml_Serialize(glob, &blockLength, 4); 39 trackNumber |= 0x80; //TODO check track nubmer < 128 40 Ebml_Write(glob, &trackNumber, 1); 41 //Ebml_WriteSigned16(glob, timeCode,2); //this is 3 bytes 42 Ebml_Serialize(glob, &timeCode, 2); 43 unsigned char flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) | discardable; 44 Ebml_Write(glob, &flags, 1); 45 Ebml_Write(glob, data, dataLength); 46 } 47 48 static UInt64 generateTrackID(unsigned int trackNumber) 49 { 50 UInt64 t = time(NULL) * trackNumber; 51 UInt64 r = rand(); 52 r = r << 32; 53 r += rand(); 54 UInt64 rval = t ^ r; 55 return rval; 56 } 57 58 void writeVideoTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing, 59 char *codecId, unsigned int pixelWidth, unsigned int pixelHeight, 60 double frameRate) 61 { 62 EbmlLoc start; 63 Ebml_StartSubElement(glob, &start, TrackEntry); 64 Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber); 65 UInt64 trackID = generateTrackID(trackNumber); 66 Ebml_SerializeUnsigned(glob, TrackUID, trackID); 67 Ebml_SerializeString(glob, CodecName, "VP8"); //TODO shouldn't be fixed 68 69 Ebml_SerializeUnsigned(glob, TrackType, 1); //video is always 1 70 Ebml_SerializeString(glob, CodecID, codecId); 71 { 72 EbmlLoc videoStart; 73 Ebml_StartSubElement(glob, &videoStart, Video); 74 Ebml_SerializeUnsigned(glob, PixelWidth, pixelWidth); 75 Ebml_SerializeUnsigned(glob, PixelHeight, pixelHeight); 76 Ebml_SerializeFloat(glob, FrameRate, frameRate); 77 Ebml_EndSubElement(glob, &videoStart); //Video 78 } 79 Ebml_EndSubElement(glob, &start); //Track Entry 80 } 81 void writeAudioTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing, 82 char *codecId, double samplingFrequency, unsigned int channels, 83 unsigned char *private, unsigned long privateSize) 84 { 85 EbmlLoc start; 86 Ebml_StartSubElement(glob, &start, TrackEntry); 87 Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber); 88 UInt64 trackID = generateTrackID(trackNumber); 89 Ebml_SerializeUnsigned(glob, TrackUID, trackID); 90 Ebml_SerializeUnsigned(glob, TrackType, 2); //audio is always 2 91 //I am using defaults for thesed required fields 92 /* Ebml_SerializeUnsigned(glob, FlagEnabled, 1); 93 Ebml_SerializeUnsigned(glob, FlagDefault, 1); 94 Ebml_SerializeUnsigned(glob, FlagForced, 1); 95 Ebml_SerializeUnsigned(glob, FlagLacing, flagLacing);*/ 96 Ebml_SerializeString(glob, CodecID, codecId); 97 Ebml_SerializeData(glob, CodecPrivate, private, privateSize); 98 99 Ebml_SerializeString(glob, CodecName, "VORBIS"); //fixed for now 100 { 101 EbmlLoc AudioStart; 102 Ebml_StartSubElement(glob, &AudioStart, Audio); 103 Ebml_SerializeFloat(glob, SamplingFrequency, samplingFrequency); 104 Ebml_SerializeUnsigned(glob, Channels, channels); 105 Ebml_EndSubElement(glob, &AudioStart); 106 } 107 Ebml_EndSubElement(glob, &start); 108 } 109 void writeSegmentInformation(EbmlGlobal *ebml, EbmlLoc* startInfo, unsigned long timeCodeScale, double duration) 110 { 111 Ebml_StartSubElement(ebml, startInfo, Info); 112 Ebml_SerializeUnsigned(ebml, TimecodeScale, timeCodeScale); 113 Ebml_SerializeFloat(ebml, Segment_Duration, duration * 1000.0); //Currently fixed to using milliseconds 114 Ebml_SerializeString(ebml, 0x4D80, "QTmuxingAppLibWebM-0.0.1"); 115 Ebml_SerializeString(ebml, 0x5741, "QTwritingAppLibWebM-0.0.1"); 116 Ebml_EndSubElement(ebml, startInfo); 117 } 118 119 /* 120 void Mkv_InitializeSegment(Ebml& ebml_out, EbmlLoc& ebmlLoc) 121 { 122 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x18538067); 123 } 124 125 void Mkv_InitializeSeek(Ebml& ebml_out, EbmlLoc& ebmlLoc) 126 { 127 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x114d9b74); 128 } 129 void Mkv_WriteSeekInformation(Ebml& ebml_out, SeekStruct& seekInformation) 130 { 131 EbmlLoc ebmlLoc; 132 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x4dbb); 133 Ebml_SerializeString(ebml_out, 0x53ab, seekInformation.SeekID); 134 Ebml_SerializeUnsigned(ebml_out, 0x53ac, seekInformation.SeekPosition); 135 Ebml_EndSubElement(ebml_out, ebmlLoc); 136 } 137 138 void Mkv_WriteSegmentInformation(Ebml& ebml_out, SegmentInformationStruct& segmentInformation) 139 { 140 Ebml_SerializeUnsigned(ebml_out, 0x73a4, segmentInformation.segmentUID); 141 if (segmentInformation.filename != 0) 142 Ebml_SerializeString(ebml_out, 0x7384, segmentInformation.filename); 143 Ebml_SerializeUnsigned(ebml_out, 0x2AD7B1, segmentInformation.TimecodeScale); 144 Ebml_SerializeUnsigned(ebml_out, 0x4489, segmentInformation.Duration); 145 //TODO date 146 Ebml_SerializeWString(ebml_out, 0x4D80, L"MKVMUX"); 147 Ebml_SerializeWString(ebml_out, 0x5741, segmentInformation.WritingApp); 148 } 149 150 void Mkv_InitializeTrack(Ebml& ebml_out, EbmlLoc& ebmlLoc) 151 { 152 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1654AE6B); 153 } 154 155 static void Mkv_WriteGenericTrackData(Ebml& ebml_out, TrackStruct& track) 156 { 157 Ebml_SerializeUnsigned(ebml_out, 0xD7, track.TrackNumber); 158 Ebml_SerializeUnsigned(ebml_out, 0x73C5, track.TrackUID); 159 Ebml_SerializeUnsigned(ebml_out, 0x83, track.TrackType); 160 Ebml_SerializeUnsigned(ebml_out, 0xB9, track.FlagEnabled ? 1 :0); 161 Ebml_SerializeUnsigned(ebml_out, 0x88, track.FlagDefault ? 1 :0); 162 Ebml_SerializeUnsigned(ebml_out, 0x55AA, track.FlagForced ? 1 :0); 163 if (track.Language != 0) 164 Ebml_SerializeString(ebml_out, 0x22B59C, track.Language); 165 if (track.CodecID != 0) 166 Ebml_SerializeString(ebml_out, 0x86, track.CodecID); 167 if (track.CodecPrivate != 0) 168 Ebml_SerializeData(ebml_out, 0x63A2, track.CodecPrivate, track.CodecPrivateLength); 169 if (track.CodecName != 0) 170 Ebml_SerializeWString(ebml_out, 0x258688, track.CodecName); 171 } 172 173 void Mkv_WriteVideoTrack(Ebml& ebml_out, TrackStruct & track, VideoTrackStruct& video) 174 { 175 EbmlLoc trackHeadLoc, videoHeadLoc; 176 Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); //start Track 177 Mkv_WriteGenericTrackData(ebml_out, track); 178 Ebml_StartSubElement(ebml_out, videoHeadLoc, 0xE0); //start Video 179 Ebml_SerializeUnsigned(ebml_out, 0x9A, video.FlagInterlaced ? 1 :0); 180 Ebml_SerializeUnsigned(ebml_out, 0xB0, video.PixelWidth); 181 Ebml_SerializeUnsigned(ebml_out, 0xBA, video.PixelHeight); 182 Ebml_SerializeUnsigned(ebml_out, 0x54B0, video.PixelDisplayWidth); 183 Ebml_SerializeUnsigned(ebml_out, 0x54BA, video.PixelDisplayHeight); 184 Ebml_SerializeUnsigned(ebml_out, 0x54B2, video.displayUnit); 185 Ebml_SerializeFloat(ebml_out, 0x2383E3, video.FrameRate); 186 Ebml_EndSubElement(ebml_out, videoHeadLoc); 187 Ebml_EndSubElement(ebml_out, trackHeadLoc); 188 189 } 190 191 void Mkv_WriteAudioTrack(Ebml& ebml_out, TrackStruct & track, AudioTrackStruct& video) 192 { 193 EbmlLoc trackHeadLoc, audioHeadLoc; 194 Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); 195 Mkv_WriteGenericTrackData(ebml_out, track); 196 Ebml_StartSubElement(ebml_out, audioHeadLoc, 0xE0); //start Audio 197 Ebml_SerializeFloat(ebml_out, 0xB5, video.SamplingFrequency); 198 Ebml_SerializeUnsigned(ebml_out, 0x9F, video.Channels); 199 Ebml_SerializeUnsigned(ebml_out, 0x6264, video.BitDepth); 200 Ebml_EndSubElement(ebml_out, audioHeadLoc); // end audio 201 Ebml_EndSubElement(ebml_out, trackHeadLoc); 202 } 203 204 void Mkv_WriteEbmlClusterHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, ClusterHeadStruct & clusterHead) 205 { 206 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1F43B675); 207 Ebml_SerializeUnsigned(ebml_out, 0x6264, clusterHead.TimeCode); 208 } 209 210 void Mkv_WriteSimpleBlockHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, SimpleBlockStruct& block) 211 { 212 Ebml_StartSubElement(ebml_out, ebmlLoc, 0xA3); 213 Ebml_Write1UInt(ebml_out, block.TrackNumber); 214 Ebml_WriteSigned16(ebml_out,block.TimeCode); 215 unsigned char flags = 0x00 | (block.iskey ? 0x80:0x00) | (block.lacing << 1) | block.discardable; 216 Ebml_Write1UInt(ebml_out, flags); //TODO this may be the wrong function 217 Ebml_Serialize(ebml_out, block.data, block.dataLength); 218 Ebml_EndSubElement(ebml_out,ebmlLoc); 219 } 220 */ 221
