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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 #include "vpx/vpx_integer.h" | |
15 | |
16 #define kVorbisPrivateMaxSize 4000 | |
17 | |
18 void writeHeader(EbmlGlobal *glob) { | |
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 timeCod
e, | |
32 int isKeyframe, unsigned char lacingFlag, int discardable, | |
33 unsigned char *data, unsigned long dataLength) { | |
34 Ebml_WriteID(glob, SimpleBlock); | |
35 unsigned long blockLength = 4 + dataLength; | |
36 blockLength |= 0x10000000; // TODO check length < 0x0FFFFFFFF | |
37 Ebml_Serialize(glob, &blockLength, sizeof(blockLength), 4); | |
38 trackNumber |= 0x80; // TODO check track nubmer < 128 | |
39 Ebml_Write(glob, &trackNumber, 1); | |
40 // Ebml_WriteSigned16(glob, timeCode,2); //this is 3 bytes | |
41 Ebml_Serialize(glob, &timeCode, sizeof(timeCode), 2); | |
42 unsigned char flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) |
discardable; | |
43 Ebml_Write(glob, &flags, 1); | |
44 Ebml_Write(glob, data, dataLength); | |
45 } | |
46 | |
47 static uint64_t generateTrackID(unsigned int trackNumber) { | |
48 uint64_t t = time(NULL) * trackNumber; | |
49 uint64_t r = rand(); | |
50 r = r << 32; | |
51 r += rand(); | |
52 uint64_t rval = t ^ r; | |
53 return rval; | |
54 } | |
55 | |
56 void writeVideoTrack(EbmlGlobal *glob, unsigned int trackNumber, | |
57 int flagLacing, const char *codecId, | |
58 unsigned int pixelWidth, unsigned int pixelHeight, | |
59 double frameRate) { | |
60 EbmlLoc start; | |
61 Ebml_StartSubElement(glob, &start, TrackEntry); | |
62 Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber); | |
63 uint64_t trackID = generateTrackID(trackNumber); | |
64 Ebml_SerializeUnsigned(glob, TrackUID, trackID); | |
65 Ebml_SerializeString(glob, CodecName, "VP8"); // TODO shouldn't be fixed | |
66 | |
67 Ebml_SerializeUnsigned(glob, TrackType, 1); // video is always 1 | |
68 Ebml_SerializeString(glob, CodecID, codecId); | |
69 { | |
70 EbmlLoc videoStart; | |
71 Ebml_StartSubElement(glob, &videoStart, Video); | |
72 Ebml_SerializeUnsigned(glob, PixelWidth, pixelWidth); | |
73 Ebml_SerializeUnsigned(glob, PixelHeight, pixelHeight); | |
74 Ebml_SerializeFloat(glob, FrameRate, frameRate); | |
75 Ebml_EndSubElement(glob, &videoStart); // Video | |
76 } | |
77 Ebml_EndSubElement(glob, &start); // Track Entry | |
78 } | |
79 void writeAudioTrack(EbmlGlobal *glob, unsigned int trackNumber, | |
80 int flagLacing, const char *codecId, | |
81 double samplingFrequency, unsigned int channels, | |
82 unsigned char *private, unsigned long privateSize) { | |
83 EbmlLoc start; | |
84 Ebml_StartSubElement(glob, &start, TrackEntry); | |
85 Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber); | |
86 uint64_t trackID = generateTrackID(trackNumber); | |
87 Ebml_SerializeUnsigned(glob, TrackUID, trackID); | |
88 Ebml_SerializeUnsigned(glob, TrackType, 2); // audio is always 2 | |
89 // I am using defaults for thesed required fields | |
90 /* Ebml_SerializeUnsigned(glob, FlagEnabled, 1); | |
91 Ebml_SerializeUnsigned(glob, FlagDefault, 1); | |
92 Ebml_SerializeUnsigned(glob, FlagForced, 1); | |
93 Ebml_SerializeUnsigned(glob, FlagLacing, flagLacing);*/ | |
94 Ebml_SerializeString(glob, CodecID, codecId); | |
95 Ebml_SerializeData(glob, CodecPrivate, private, privateSize); | |
96 | |
97 Ebml_SerializeString(glob, CodecName, "VORBIS"); // fixed for now | |
98 { | |
99 EbmlLoc AudioStart; | |
100 Ebml_StartSubElement(glob, &AudioStart, Audio); | |
101 Ebml_SerializeFloat(glob, SamplingFrequency, samplingFrequency); | |
102 Ebml_SerializeUnsigned(glob, Channels, channels); | |
103 Ebml_EndSubElement(glob, &AudioStart); | |
104 } | |
105 Ebml_EndSubElement(glob, &start); | |
106 } | |
107 void writeSegmentInformation(EbmlGlobal *ebml, EbmlLoc *startInfo, unsigned long
timeCodeScale, double duration) { | |
108 Ebml_StartSubElement(ebml, startInfo, Info); | |
109 Ebml_SerializeUnsigned(ebml, TimecodeScale, timeCodeScale); | |
110 Ebml_SerializeFloat(ebml, Segment_Duration, duration * 1000.0); // Currently f
ixed to using milliseconds | |
111 Ebml_SerializeString(ebml, 0x4D80, "QTmuxingAppLibWebM-0.0.1"); | |
112 Ebml_SerializeString(ebml, 0x5741, "QTwritingAppLibWebM-0.0.1"); | |
113 Ebml_EndSubElement(ebml, startInfo); | |
114 } | |
115 | |
116 /* | |
117 void Mkv_InitializeSegment(Ebml& ebml_out, EbmlLoc& ebmlLoc) | |
118 { | |
119 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x18538067); | |
120 } | |
121 | |
122 void Mkv_InitializeSeek(Ebml& ebml_out, EbmlLoc& ebmlLoc) | |
123 { | |
124 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x114d9b74); | |
125 } | |
126 void Mkv_WriteSeekInformation(Ebml& ebml_out, SeekStruct& seekInformation) | |
127 { | |
128 EbmlLoc ebmlLoc; | |
129 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x4dbb); | |
130 Ebml_SerializeString(ebml_out, 0x53ab, seekInformation.SeekID); | |
131 Ebml_SerializeUnsigned(ebml_out, 0x53ac, seekInformation.SeekPosition); | |
132 Ebml_EndSubElement(ebml_out, ebmlLoc); | |
133 } | |
134 | |
135 void Mkv_WriteSegmentInformation(Ebml& ebml_out, SegmentInformationStruct& segme
ntInformation) | |
136 { | |
137 Ebml_SerializeUnsigned(ebml_out, 0x73a4, segmentInformation.segmentUID); | |
138 if (segmentInformation.filename != 0) | |
139 Ebml_SerializeString(ebml_out, 0x7384, segmentInformation.filename); | |
140 Ebml_SerializeUnsigned(ebml_out, 0x2AD7B1, segmentInformation.TimecodeScale)
; | |
141 Ebml_SerializeUnsigned(ebml_out, 0x4489, segmentInformation.Duration); | |
142 // TODO date | |
143 Ebml_SerializeWString(ebml_out, 0x4D80, L"MKVMUX"); | |
144 Ebml_SerializeWString(ebml_out, 0x5741, segmentInformation.WritingApp); | |
145 } | |
146 | |
147 void Mkv_InitializeTrack(Ebml& ebml_out, EbmlLoc& ebmlLoc) | |
148 { | |
149 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1654AE6B); | |
150 } | |
151 | |
152 static void Mkv_WriteGenericTrackData(Ebml& ebml_out, TrackStruct& track) | |
153 { | |
154 Ebml_SerializeUnsigned(ebml_out, 0xD7, track.TrackNumber); | |
155 Ebml_SerializeUnsigned(ebml_out, 0x73C5, track.TrackUID); | |
156 Ebml_SerializeUnsigned(ebml_out, 0x83, track.TrackType); | |
157 Ebml_SerializeUnsigned(ebml_out, 0xB9, track.FlagEnabled ? 1 :0); | |
158 Ebml_SerializeUnsigned(ebml_out, 0x88, track.FlagDefault ? 1 :0); | |
159 Ebml_SerializeUnsigned(ebml_out, 0x55AA, track.FlagForced ? 1 :0); | |
160 if (track.Language != 0) | |
161 Ebml_SerializeString(ebml_out, 0x22B59C, track.Language); | |
162 if (track.CodecID != 0) | |
163 Ebml_SerializeString(ebml_out, 0x86, track.CodecID); | |
164 if (track.CodecPrivate != 0) | |
165 Ebml_SerializeData(ebml_out, 0x63A2, track.CodecPrivate, track.CodecPriv
ateLength); | |
166 if (track.CodecName != 0) | |
167 Ebml_SerializeWString(ebml_out, 0x258688, track.CodecName); | |
168 } | |
169 | |
170 void Mkv_WriteVideoTrack(Ebml& ebml_out, TrackStruct & track, VideoTrackStruct&
video) | |
171 { | |
172 EbmlLoc trackHeadLoc, videoHeadLoc; | |
173 Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); // start Track | |
174 Mkv_WriteGenericTrackData(ebml_out, track); | |
175 Ebml_StartSubElement(ebml_out, videoHeadLoc, 0xE0); // start Video | |
176 Ebml_SerializeUnsigned(ebml_out, 0x9A, video.FlagInterlaced ? 1 :0); | |
177 Ebml_SerializeUnsigned(ebml_out, 0xB0, video.PixelWidth); | |
178 Ebml_SerializeUnsigned(ebml_out, 0xBA, video.PixelHeight); | |
179 Ebml_SerializeUnsigned(ebml_out, 0x54B0, video.PixelDisplayWidth); | |
180 Ebml_SerializeUnsigned(ebml_out, 0x54BA, video.PixelDisplayHeight); | |
181 Ebml_SerializeUnsigned(ebml_out, 0x54B2, video.displayUnit); | |
182 Ebml_SerializeFloat(ebml_out, 0x2383E3, video.FrameRate); | |
183 Ebml_EndSubElement(ebml_out, videoHeadLoc); | |
184 Ebml_EndSubElement(ebml_out, trackHeadLoc); | |
185 | |
186 } | |
187 | |
188 void Mkv_WriteAudioTrack(Ebml& ebml_out, TrackStruct & track, AudioTrackStruct&
video) | |
189 { | |
190 EbmlLoc trackHeadLoc, audioHeadLoc; | |
191 Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); | |
192 Mkv_WriteGenericTrackData(ebml_out, track); | |
193 Ebml_StartSubElement(ebml_out, audioHeadLoc, 0xE0); // start Audio | |
194 Ebml_SerializeFloat(ebml_out, 0xB5, video.SamplingFrequency); | |
195 Ebml_SerializeUnsigned(ebml_out, 0x9F, video.Channels); | |
196 Ebml_SerializeUnsigned(ebml_out, 0x6264, video.BitDepth); | |
197 Ebml_EndSubElement(ebml_out, audioHeadLoc); // end audio | |
198 Ebml_EndSubElement(ebml_out, trackHeadLoc); | |
199 } | |
200 | |
201 void Mkv_WriteEbmlClusterHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, ClusterHeadStru
ct & clusterHead) | |
202 { | |
203 Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1F43B675); | |
204 Ebml_SerializeUnsigned(ebml_out, 0x6264, clusterHead.TimeCode); | |
205 } | |
206 | |
207 void Mkv_WriteSimpleBlockHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, SimpleBlockStru
ct& block) | |
208 { | |
209 Ebml_StartSubElement(ebml_out, ebmlLoc, 0xA3); | |
210 Ebml_Write1UInt(ebml_out, block.TrackNumber); | |
211 Ebml_WriteSigned16(ebml_out,block.TimeCode); | |
212 unsigned char flags = 0x00 | (block.iskey ? 0x80:0x00) | (block.lacing << 1)
| block.discardable; | |
213 Ebml_Write1UInt(ebml_out, flags); // TODO this may be the wrong function | |
214 Ebml_Serialize(ebml_out, block.data, block.dataLength); | |
215 Ebml_EndSubElement(ebml_out,ebmlLoc); | |
216 } | |
217 */ | |
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