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