media/libmkv/WebMElement.c

   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 #include "EbmlIDs.h"
  10 #include "WebMElement.h"
  11 #include <stdio.h>
  12 #include <stdint.h>
  13 #include <stdlib.h>
  14 #include <time.h>
  15
  16 #define kVorbisPrivateMaxSize  4000
  17 #define UInt64 uint64_t
  18
  19 void writeHeader(EbmlGlobal *glob) {
  20   EbmlLoc start;
  21   Ebml_StartSubElement(glob, &start, EBML);
  22   Ebml_SerializeUnsigned(glob, EBMLVersion, 1);
  23   Ebml_SerializeUnsigned(glob, EBMLReadVersion, 1); // EBML Read Version
  24   Ebml_SerializeUnsigned(glob, EBMLMaxIDLength, 4); // EBML Max ID Length
  25   Ebml_SerializeUnsigned(glob, EBMLMaxSizeLength, 8); // EBML Max Size Length
  26   Ebml_SerializeString(glob, DocType, "webm"); // Doc Type
  27   Ebml_SerializeUnsigned(glob, DocTypeVersion, 2); // Doc Type Version
  28   Ebml_SerializeUnsigned(glob, DocTypeReadVersion, 2); // Doc Type Read Version
  29   Ebml_EndSubElement(glob, &start);
  30 }
  31
  32 void writeSimpleBlock(EbmlGlobal *glob, unsigned char trackNumber, short timeCode,
  33                       int isKeyframe, unsigned char lacingFlag, int discardable,
  34                       unsigned char *data, unsigned long dataLength) {
  35   unsigned long blockLength = 4 + dataLength;
  36   unsigned char flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) | discardable;
  37   Ebml_WriteID(glob, SimpleBlock);
  38   blockLength |= 0x10000000; // TODO check length < 0x0FFFFFFFF
  39   Ebml_Serialize(glob, &blockLength, sizeof(blockLength), 4);
  40   trackNumber |= 0x80;  // TODO check track nubmer < 128
  41   Ebml_Write(glob, &trackNumber, 1);
  42   // Ebml_WriteSigned16(glob, timeCode,2); //this is 3 bytes
  43   Ebml_Serialize(glob, &timeCode, sizeof(timeCode), 2);
  44   flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) | discardable;
  45   Ebml_Write(glob, &flags, 1);
  46   Ebml_Write(glob, data, dataLength);
  47 }
  48
  49 static UInt64 generateTrackID(unsigned int trackNumber) {
  50   UInt64 t = time(NULL) * trackNumber;
  51   UInt64 r = rand();
  52   r = r << 32;
  53   r +=  rand();
  54 //  UInt64 rval = t ^ r;
  55   return t ^ r;
  56 }
  57
  58 void writeVideoTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing,
  59                      const char *codecId, unsigned int pixelWidth, unsigned int pixelHeight,
  60                      unsigned int displayWidth, unsigned int displayHeight) {
  61   EbmlLoc start;
  62   UInt64 trackID;
  63   Ebml_StartSubElement(glob, &start, TrackEntry);
  64   Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
  65   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     if (pixelWidth != displayWidth) {
  77       Ebml_SerializeUnsigned(glob, DisplayWidth, displayWidth);
  78     }
  79     if (pixelHeight != displayHeight) {
  80       Ebml_SerializeUnsigned(glob, DisplayHeight, displayHeight);
  81     }
  82     Ebml_EndSubElement(glob, &videoStart); // Video
  83   }
  84   Ebml_EndSubElement(glob, &start); // Track Entry
  85 }
  86 void writeAudioTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing,
  87                      const char *codecId, double samplingFrequency, unsigned int channels,
  88                      uint64_t codecDelay, uint64_t seekPreRoll,
  89                      unsigned char *private, unsigned long privateSize) {
  90   EbmlLoc start;
  91   UInt64 trackID;
  92   Ebml_StartSubElement(glob, &start, TrackEntry);
  93   Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
  94   trackID = generateTrackID(trackNumber);
  95   Ebml_SerializeUnsigned(glob, TrackUID, trackID);
  96   Ebml_SerializeUnsigned(glob, TrackType, 2); // audio is always 2
  97   Ebml_SerializeUnsigned(glob, CodecDelay, codecDelay);
  98   Ebml_SerializeUnsigned(glob, SeekPreRoll, seekPreRoll);
  99   // I am using defaults for thesed required fields
 100   /*  Ebml_SerializeUnsigned(glob, FlagEnabled, 1);
 101       Ebml_SerializeUnsigned(glob, FlagDefault, 1);
 102       Ebml_SerializeUnsigned(glob, FlagForced, 1);
 103       Ebml_SerializeUnsigned(glob, FlagLacing, flagLacing);*/
 104   Ebml_SerializeString(glob, CodecID, codecId);
 105   Ebml_SerializeData(glob, CodecPrivate, private, privateSize);
 106
 107   Ebml_SerializeString(glob, CodecName, "OPUS");  // fixed for now
 108   {
 109     EbmlLoc AudioStart;
 110     Ebml_StartSubElement(glob, &AudioStart, Audio);
 111     Ebml_SerializeFloat(glob, SamplingFrequency, samplingFrequency);
 112     Ebml_SerializeUnsigned(glob, Channels, channels);
 113     Ebml_EndSubElement(glob, &AudioStart);
 114   }
 115   Ebml_EndSubElement(glob, &start);
 116 }
 117 void writeSegmentInformation(EbmlGlobal *ebml, EbmlLoc *startInfo, unsigned long timeCodeScale, double duration) {
 118   Ebml_StartSubElement(ebml, startInfo, Info);
 119   Ebml_SerializeUnsigned(ebml, TimecodeScale, timeCodeScale);
 120   Ebml_SerializeFloat(ebml, Segment_Duration, duration * 1000.0); // Currently fixed to using milliseconds
 121   Ebml_SerializeString(ebml, 0x4D80, "QTmuxingAppLibWebM-0.0.1");
 122   Ebml_SerializeString(ebml, 0x5741, "QTwritingAppLibWebM-0.0.1");
 123   Ebml_EndSubElement(ebml, startInfo);
 124 }
 125
 126 /*
 127 void Mkv_InitializeSegment(Ebml& ebml_out, EbmlLoc& ebmlLoc)
 128 {
 129     Ebml_StartSubElement(ebml_out, ebmlLoc, 0x18538067);
 130 }
 131
 132 void Mkv_InitializeSeek(Ebml& ebml_out, EbmlLoc& ebmlLoc)
 133 {
 134     Ebml_StartSubElement(ebml_out, ebmlLoc, 0x114d9b74);
 135 }
 136 void Mkv_WriteSeekInformation(Ebml& ebml_out, SeekStruct& seekInformation)
 137 {
 138     EbmlLoc ebmlLoc;
 139     Ebml_StartSubElement(ebml_out, ebmlLoc, 0x4dbb);
 140     Ebml_SerializeString(ebml_out, 0x53ab, seekInformation.SeekID);
 141     Ebml_SerializeUnsigned(ebml_out, 0x53ac, seekInformation.SeekPosition);
 142     Ebml_EndSubElement(ebml_out, ebmlLoc);
 143 }
 144
 145 void Mkv_WriteSegmentInformation(Ebml& ebml_out, SegmentInformationStruct& segmentInformation)
 146 {
 147     Ebml_SerializeUnsigned(ebml_out, 0x73a4, segmentInformation.segmentUID);
 148     if (segmentInformation.filename != 0)
 149         Ebml_SerializeString(ebml_out, 0x7384, segmentInformation.filename);
 150     Ebml_SerializeUnsigned(ebml_out, 0x2AD7B1, segmentInformation.TimecodeScale);
 151     Ebml_SerializeUnsigned(ebml_out, 0x4489, segmentInformation.Duration);
 152     // TODO date
 153     Ebml_SerializeWString(ebml_out, 0x4D80, L"MKVMUX");
 154     Ebml_SerializeWString(ebml_out, 0x5741, segmentInformation.WritingApp);
 155 }
 156
 157 void Mkv_InitializeTrack(Ebml& ebml_out, EbmlLoc& ebmlLoc)
 158 {
 159     Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1654AE6B);
 160 }
 161
 162 static void Mkv_WriteGenericTrackData(Ebml& ebml_out, TrackStruct& track)
 163 {
 164     Ebml_SerializeUnsigned(ebml_out, 0xD7, track.TrackNumber);
 165     Ebml_SerializeUnsigned(ebml_out, 0x73C5, track.TrackUID);
 166     Ebml_SerializeUnsigned(ebml_out, 0x83, track.TrackType);
 167     Ebml_SerializeUnsigned(ebml_out, 0xB9, track.FlagEnabled ? 1 :0);
 168     Ebml_SerializeUnsigned(ebml_out, 0x88, track.FlagDefault ? 1 :0);
 169     Ebml_SerializeUnsigned(ebml_out, 0x55AA, track.FlagForced ? 1 :0);
 170     if (track.Language != 0)
 171         Ebml_SerializeString(ebml_out, 0x22B59C, track.Language);
 172     if (track.CodecID != 0)
 173         Ebml_SerializeString(ebml_out, 0x86, track.CodecID);
 174     if (track.CodecPrivate != 0)
 175         Ebml_SerializeData(ebml_out, 0x63A2, track.CodecPrivate, track.CodecPrivateLength);
 176     if (track.CodecName != 0)
 177         Ebml_SerializeWString(ebml_out, 0x258688, track.CodecName);
 178 }
 179
 180 void Mkv_WriteVideoTrack(Ebml& ebml_out, TrackStruct & track, VideoTrackStruct& video)
 181 {
 182     EbmlLoc trackHeadLoc, videoHeadLoc;
 183     Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE);  // start Track
 184     Mkv_WriteGenericTrackData(ebml_out, track);
 185     Ebml_StartSubElement(ebml_out, videoHeadLoc, 0xE0);  // start Video
 186     Ebml_SerializeUnsigned(ebml_out, 0x9A, video.FlagInterlaced ? 1 :0);
 187     Ebml_SerializeUnsigned(ebml_out, 0xB0, video.PixelWidth);
 188     Ebml_SerializeUnsigned(ebml_out, 0xBA, video.PixelHeight);
 189     Ebml_SerializeUnsigned(ebml_out, 0x54B0, video.PixelDisplayWidth);
 190     Ebml_SerializeUnsigned(ebml_out, 0x54BA, video.PixelDisplayHeight);
 191     Ebml_SerializeUnsigned(ebml_out, 0x54B2, video.displayUnit);
 192     Ebml_SerializeFloat(ebml_out, 0x2383E3, video.FrameRate);
 193     Ebml_EndSubElement(ebml_out, videoHeadLoc);
 194     Ebml_EndSubElement(ebml_out, trackHeadLoc);
 195
 196 }
 197
 198 void Mkv_WriteAudioTrack(Ebml& ebml_out, TrackStruct & track, AudioTrackStruct& video)
 199 {
 200     EbmlLoc trackHeadLoc, audioHeadLoc;
 201     Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE);
 202     Mkv_WriteGenericTrackData(ebml_out, track);
 203     Ebml_StartSubElement(ebml_out, audioHeadLoc, 0xE0);  // start Audio
 204     Ebml_SerializeFloat(ebml_out, 0xB5, video.SamplingFrequency);
 205     Ebml_SerializeUnsigned(ebml_out, 0x9F, video.Channels);
 206     Ebml_SerializeUnsigned(ebml_out, 0x6264, video.BitDepth);
 207     Ebml_EndSubElement(ebml_out, audioHeadLoc); // end audio
 208     Ebml_EndSubElement(ebml_out, trackHeadLoc);
 209 }
 210
 211 void Mkv_WriteEbmlClusterHead(Ebml& ebml_out,  EbmlLoc& ebmlLoc, ClusterHeadStruct & clusterHead)
 212 {
 213     Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1F43B675);
 214     Ebml_SerializeUnsigned(ebml_out, 0x6264, clusterHead.TimeCode);
 215 }
 216
 217 void Mkv_WriteSimpleBlockHead(Ebml& ebml_out,  EbmlLoc& ebmlLoc, SimpleBlockStruct& block)
 218 {
 219     Ebml_StartSubElement(ebml_out, ebmlLoc, 0xA3);
 220     Ebml_Write1UInt(ebml_out, block.TrackNumber);
 221     Ebml_WriteSigned16(ebml_out,block.TimeCode);
 222     unsigned char flags = 0x00 | (block.iskey ? 0x80:0x00) | (block.lacing << 1) | block.discardable;
 223     Ebml_Write1UInt(ebml_out, flags);  // TODO this may be the wrong function
 224     Ebml_Serialize(ebml_out, block.data, block.dataLength);
 225     Ebml_EndSubElement(ebml_out,ebmlLoc);
 226 }
 227 */