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media/libmkv/WebMElement.c@ac0c01689b40 (annotated)

media/libmkv/WebMElement.c

Thu, 15 Jan 2015 15:59:08 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 15 Jan 2015 15:59:08 +0100
branch
TOR_BUG_9701
changeset 10
ac0c01689b40
permissions
-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0 1 // Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0 2 //
michael@0 3 // Use of this source code is governed by a BSD-style license
michael@0 4 // that can be found in the LICENSE file in the root of the source
michael@0 5 // tree. An additional intellectual property rights grant can be found
michael@0 6 // in the file PATENTS. All contributing project authors may
michael@0 7 // be found in the AUTHORS file in the root of the source tree.
michael@0 8
michael@0 9 #include "EbmlIDs.h"
michael@0 10 #include "WebMElement.h"
michael@0 11 #include <stdio.h>
michael@0 12 #include <stdint.h>
michael@0 13 #include <stdlib.h>
michael@0 14 #include <time.h>
michael@0 15
michael@0 16 #define kVorbisPrivateMaxSize 4000
michael@0 17 #define UInt64 uint64_t
michael@0 18
michael@0 19 void writeHeader(EbmlGlobal *glob) {
michael@0 20 EbmlLoc start;
michael@0 21 Ebml_StartSubElement(glob, &start, EBML);
michael@0 22 Ebml_SerializeUnsigned(glob, EBMLVersion, 1);
michael@0 23 Ebml_SerializeUnsigned(glob, EBMLReadVersion, 1); // EBML Read Version
michael@0 24 Ebml_SerializeUnsigned(glob, EBMLMaxIDLength, 4); // EBML Max ID Length
michael@0 25 Ebml_SerializeUnsigned(glob, EBMLMaxSizeLength, 8); // EBML Max Size Length
michael@0 26 Ebml_SerializeString(glob, DocType, "webm"); // Doc Type
michael@0 27 Ebml_SerializeUnsigned(glob, DocTypeVersion, 2); // Doc Type Version
michael@0 28 Ebml_SerializeUnsigned(glob, DocTypeReadVersion, 2); // Doc Type Read Version
michael@0 29 Ebml_EndSubElement(glob, &start);
michael@0 30 }
michael@0 31
michael@0 32 void writeSimpleBlock(EbmlGlobal *glob, unsigned char trackNumber, short timeCode,
michael@0 33 int isKeyframe, unsigned char lacingFlag, int discardable,
michael@0 34 unsigned char *data, unsigned long dataLength) {
michael@0 35 unsigned long blockLength = 4 + dataLength;
michael@0 36 unsigned char flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) | discardable;
michael@0 37 Ebml_WriteID(glob, SimpleBlock);
michael@0 38 blockLength |= 0x10000000; // TODO check length < 0x0FFFFFFFF
michael@0 39 Ebml_Serialize(glob, &blockLength, sizeof(blockLength), 4);
michael@0 40 trackNumber |= 0x80; // TODO check track nubmer < 128
michael@0 41 Ebml_Write(glob, &trackNumber, 1);
michael@0 42 // Ebml_WriteSigned16(glob, timeCode,2); //this is 3 bytes
michael@0 43 Ebml_Serialize(glob, &timeCode, sizeof(timeCode), 2);
michael@0 44 flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) | discardable;
michael@0 45 Ebml_Write(glob, &flags, 1);
michael@0 46 Ebml_Write(glob, data, dataLength);
michael@0 47 }
michael@0 48
michael@0 49 static UInt64 generateTrackID(unsigned int trackNumber) {
michael@0 50 UInt64 t = time(NULL) * trackNumber;
michael@0 51 UInt64 r = rand();
michael@0 52 r = r << 32;
michael@0 53 r += rand();
michael@0 54 // UInt64 rval = t ^ r;
michael@0 55 return t ^ r;
michael@0 56 }
michael@0 57
michael@0 58 void writeVideoTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing,
michael@0 59 const char *codecId, unsigned int pixelWidth, unsigned int pixelHeight,
michael@0 60 unsigned int displayWidth, unsigned int displayHeight,
michael@0 61 double frameRate) {
michael@0 62 EbmlLoc start;
michael@0 63 UInt64 trackID;
michael@0 64 Ebml_StartSubElement(glob, &start, TrackEntry);
michael@0 65 Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
michael@0 66 trackID = generateTrackID(trackNumber);
michael@0 67 Ebml_SerializeUnsigned(glob, TrackUID, trackID);
michael@0 68 Ebml_SerializeString(glob, CodecName, "VP8"); // TODO shouldn't be fixed
michael@0 69
michael@0 70 Ebml_SerializeUnsigned(glob, TrackType, 1); // video is always 1
michael@0 71 Ebml_SerializeString(glob, CodecID, codecId);
michael@0 72 {
michael@0 73 EbmlLoc videoStart;
michael@0 74 Ebml_StartSubElement(glob, &videoStart, Video);
michael@0 75 Ebml_SerializeUnsigned(glob, PixelWidth, pixelWidth);
michael@0 76 Ebml_SerializeUnsigned(glob, PixelHeight, pixelHeight);
michael@0 77 if (pixelWidth != displayWidth) {
michael@0 78 Ebml_SerializeUnsigned(glob, DisplayWidth, displayWidth);
michael@0 79 }
michael@0 80 if (pixelHeight != displayHeight) {
michael@0 81 Ebml_SerializeUnsigned(glob, DisplayHeight, displayHeight);
michael@0 82 }
michael@0 83 Ebml_SerializeFloat(glob, FrameRate, frameRate);
michael@0 84 Ebml_EndSubElement(glob, &videoStart); // Video
michael@0 85 }
michael@0 86 Ebml_EndSubElement(glob, &start); // Track Entry
michael@0 87 }
michael@0 88 void writeAudioTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing,
michael@0 89 const char *codecId, double samplingFrequency, unsigned int channels,
michael@0 90 unsigned char *private, unsigned long privateSize) {
michael@0 91 EbmlLoc start;
michael@0 92 UInt64 trackID;
michael@0 93 Ebml_StartSubElement(glob, &start, TrackEntry);
michael@0 94 Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
michael@0 95 trackID = generateTrackID(trackNumber);
michael@0 96 Ebml_SerializeUnsigned(glob, TrackUID, trackID);
michael@0 97 Ebml_SerializeUnsigned(glob, TrackType, 2); // audio is always 2
michael@0 98 // I am using defaults for thesed required fields
michael@0 99 /* Ebml_SerializeUnsigned(glob, FlagEnabled, 1);
michael@0 100 Ebml_SerializeUnsigned(glob, FlagDefault, 1);
michael@0 101 Ebml_SerializeUnsigned(glob, FlagForced, 1);
michael@0 102 Ebml_SerializeUnsigned(glob, FlagLacing, flagLacing);*/
michael@0 103 Ebml_SerializeString(glob, CodecID, codecId);
michael@0 104 Ebml_SerializeData(glob, CodecPrivate, private, privateSize);
michael@0 105
michael@0 106 Ebml_SerializeString(glob, CodecName, "VORBIS"); // fixed for now
michael@0 107 {
michael@0 108 EbmlLoc AudioStart;
michael@0 109 Ebml_StartSubElement(glob, &AudioStart, Audio);
michael@0 110 Ebml_SerializeFloat(glob, SamplingFrequency, samplingFrequency);
michael@0 111 Ebml_SerializeUnsigned(glob, Channels, channels);
michael@0 112 Ebml_EndSubElement(glob, &AudioStart);
michael@0 113 }
michael@0 114 Ebml_EndSubElement(glob, &start);
michael@0 115 }
michael@0 116 void writeSegmentInformation(EbmlGlobal *ebml, EbmlLoc *startInfo, unsigned long timeCodeScale, double duration) {
michael@0 117 Ebml_StartSubElement(ebml, startInfo, Info);
michael@0 118 Ebml_SerializeUnsigned(ebml, TimecodeScale, timeCodeScale);
michael@0 119 Ebml_SerializeFloat(ebml, Segment_Duration, duration * 1000.0); // Currently fixed to using milliseconds
michael@0 120 Ebml_SerializeString(ebml, 0x4D80, "QTmuxingAppLibWebM-0.0.1");
michael@0 121 Ebml_SerializeString(ebml, 0x5741, "QTwritingAppLibWebM-0.0.1");
michael@0 122 Ebml_EndSubElement(ebml, startInfo);
michael@0 123 }
michael@0 124
michael@0 125 /*
michael@0 126 void Mkv_InitializeSegment(Ebml& ebml_out, EbmlLoc& ebmlLoc)
michael@0 127 {
michael@0 128 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x18538067);
michael@0 129 }
michael@0 130
michael@0 131 void Mkv_InitializeSeek(Ebml& ebml_out, EbmlLoc& ebmlLoc)
michael@0 132 {
michael@0 133 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x114d9b74);
michael@0 134 }
michael@0 135 void Mkv_WriteSeekInformation(Ebml& ebml_out, SeekStruct& seekInformation)
michael@0 136 {
michael@0 137 EbmlLoc ebmlLoc;
michael@0 138 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x4dbb);
michael@0 139 Ebml_SerializeString(ebml_out, 0x53ab, seekInformation.SeekID);
michael@0 140 Ebml_SerializeUnsigned(ebml_out, 0x53ac, seekInformation.SeekPosition);
michael@0 141 Ebml_EndSubElement(ebml_out, ebmlLoc);
michael@0 142 }
michael@0 143
michael@0 144 void Mkv_WriteSegmentInformation(Ebml& ebml_out, SegmentInformationStruct& segmentInformation)
michael@0 145 {
michael@0 146 Ebml_SerializeUnsigned(ebml_out, 0x73a4, segmentInformation.segmentUID);
michael@0 147 if (segmentInformation.filename != 0)
michael@0 148 Ebml_SerializeString(ebml_out, 0x7384, segmentInformation.filename);
michael@0 149 Ebml_SerializeUnsigned(ebml_out, 0x2AD7B1, segmentInformation.TimecodeScale);
michael@0 150 Ebml_SerializeUnsigned(ebml_out, 0x4489, segmentInformation.Duration);
michael@0 151 // TODO date
michael@0 152 Ebml_SerializeWString(ebml_out, 0x4D80, L"MKVMUX");
michael@0 153 Ebml_SerializeWString(ebml_out, 0x5741, segmentInformation.WritingApp);
michael@0 154 }
michael@0 155
michael@0 156 void Mkv_InitializeTrack(Ebml& ebml_out, EbmlLoc& ebmlLoc)
michael@0 157 {
michael@0 158 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1654AE6B);
michael@0 159 }
michael@0 160
michael@0 161 static void Mkv_WriteGenericTrackData(Ebml& ebml_out, TrackStruct& track)
michael@0 162 {
michael@0 163 Ebml_SerializeUnsigned(ebml_out, 0xD7, track.TrackNumber);
michael@0 164 Ebml_SerializeUnsigned(ebml_out, 0x73C5, track.TrackUID);
michael@0 165 Ebml_SerializeUnsigned(ebml_out, 0x83, track.TrackType);
michael@0 166 Ebml_SerializeUnsigned(ebml_out, 0xB9, track.FlagEnabled ? 1 :0);
michael@0 167 Ebml_SerializeUnsigned(ebml_out, 0x88, track.FlagDefault ? 1 :0);
michael@0 168 Ebml_SerializeUnsigned(ebml_out, 0x55AA, track.FlagForced ? 1 :0);
michael@0 169 if (track.Language != 0)
michael@0 170 Ebml_SerializeString(ebml_out, 0x22B59C, track.Language);
michael@0 171 if (track.CodecID != 0)
michael@0 172 Ebml_SerializeString(ebml_out, 0x86, track.CodecID);
michael@0 173 if (track.CodecPrivate != 0)
michael@0 174 Ebml_SerializeData(ebml_out, 0x63A2, track.CodecPrivate, track.CodecPrivateLength);
michael@0 175 if (track.CodecName != 0)
michael@0 176 Ebml_SerializeWString(ebml_out, 0x258688, track.CodecName);
michael@0 177 }
michael@0 178
michael@0 179 void Mkv_WriteVideoTrack(Ebml& ebml_out, TrackStruct & track, VideoTrackStruct& video)
michael@0 180 {
michael@0 181 EbmlLoc trackHeadLoc, videoHeadLoc;
michael@0 182 Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); // start Track
michael@0 183 Mkv_WriteGenericTrackData(ebml_out, track);
michael@0 184 Ebml_StartSubElement(ebml_out, videoHeadLoc, 0xE0); // start Video
michael@0 185 Ebml_SerializeUnsigned(ebml_out, 0x9A, video.FlagInterlaced ? 1 :0);
michael@0 186 Ebml_SerializeUnsigned(ebml_out, 0xB0, video.PixelWidth);
michael@0 187 Ebml_SerializeUnsigned(ebml_out, 0xBA, video.PixelHeight);
michael@0 188 Ebml_SerializeUnsigned(ebml_out, 0x54B0, video.PixelDisplayWidth);
michael@0 189 Ebml_SerializeUnsigned(ebml_out, 0x54BA, video.PixelDisplayHeight);
michael@0 190 Ebml_SerializeUnsigned(ebml_out, 0x54B2, video.displayUnit);
michael@0 191 Ebml_SerializeFloat(ebml_out, 0x2383E3, video.FrameRate);
michael@0 192 Ebml_EndSubElement(ebml_out, videoHeadLoc);
michael@0 193 Ebml_EndSubElement(ebml_out, trackHeadLoc);
michael@0 194
michael@0 195 }
michael@0 196
michael@0 197 void Mkv_WriteAudioTrack(Ebml& ebml_out, TrackStruct & track, AudioTrackStruct& video)
michael@0 198 {
michael@0 199 EbmlLoc trackHeadLoc, audioHeadLoc;
michael@0 200 Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE);
michael@0 201 Mkv_WriteGenericTrackData(ebml_out, track);
michael@0 202 Ebml_StartSubElement(ebml_out, audioHeadLoc, 0xE0); // start Audio
michael@0 203 Ebml_SerializeFloat(ebml_out, 0xB5, video.SamplingFrequency);
michael@0 204 Ebml_SerializeUnsigned(ebml_out, 0x9F, video.Channels);
michael@0 205 Ebml_SerializeUnsigned(ebml_out, 0x6264, video.BitDepth);
michael@0 206 Ebml_EndSubElement(ebml_out, audioHeadLoc); // end audio
michael@0 207 Ebml_EndSubElement(ebml_out, trackHeadLoc);
michael@0 208 }
michael@0 209
michael@0 210 void Mkv_WriteEbmlClusterHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, ClusterHeadStruct & clusterHead)
michael@0 211 {
michael@0 212 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1F43B675);
michael@0 213 Ebml_SerializeUnsigned(ebml_out, 0x6264, clusterHead.TimeCode);
michael@0 214 }
michael@0 215
michael@0 216 void Mkv_WriteSimpleBlockHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, SimpleBlockStruct& block)
michael@0 217 {
michael@0 218 Ebml_StartSubElement(ebml_out, ebmlLoc, 0xA3);
michael@0 219 Ebml_Write1UInt(ebml_out, block.TrackNumber);
michael@0 220 Ebml_WriteSigned16(ebml_out,block.TimeCode);
michael@0 221 unsigned char flags = 0x00 | (block.iskey ? 0x80:0x00) | (block.lacing << 1) | block.discardable;
michael@0 222 Ebml_Write1UInt(ebml_out, flags); // TODO this may be the wrong function
michael@0 223 Ebml_Serialize(ebml_out, block.data, block.dataLength);
michael@0 224 Ebml_EndSubElement(ebml_out,ebmlLoc);
michael@0 225 }
michael@0 226 */

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