215 строки
9.1 KiB
C
215 строки
9.1 KiB
C
// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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#include "EbmlBufferWriter.h"
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#include "EbmlIDs.h"
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#include "WebMElement.h"
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#include <stdio.h>
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#define kVorbisPrivateMaxSize 4000
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void writeHeader(EbmlGlobal *glob) {
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EbmlLoc start;
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Ebml_StartSubElement(glob, &start, EBML);
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Ebml_SerializeUnsigned(glob, EBMLVersion, 1);
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Ebml_SerializeUnsigned(glob, EBMLReadVersion, 1); // EBML Read Version
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Ebml_SerializeUnsigned(glob, EBMLMaxIDLength, 4); // EBML Max ID Length
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Ebml_SerializeUnsigned(glob, EBMLMaxSizeLength, 8); // EBML Max Size Length
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Ebml_SerializeString(glob, DocType, "webm"); // Doc Type
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Ebml_SerializeUnsigned(glob, DocTypeVersion, 2); // Doc Type Version
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Ebml_SerializeUnsigned(glob, DocTypeReadVersion, 2); // Doc Type Read Version
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Ebml_EndSubElement(glob, &start);
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}
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void writeSimpleBlock(EbmlGlobal *glob, unsigned char trackNumber, short timeCode,
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int isKeyframe, unsigned char lacingFlag, int discardable,
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unsigned char *data, unsigned long dataLength) {
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Ebml_WriteID(glob, SimpleBlock);
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unsigned long blockLength = 4 + dataLength;
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blockLength |= 0x10000000; // TODO check length < 0x0FFFFFFFF
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Ebml_Serialize(glob, &blockLength, sizeof(blockLength), 4);
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trackNumber |= 0x80; // TODO check track nubmer < 128
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Ebml_Write(glob, &trackNumber, 1);
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// Ebml_WriteSigned16(glob, timeCode,2); //this is 3 bytes
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Ebml_Serialize(glob, &timeCode, sizeof(timeCode), 2);
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unsigned char flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) | discardable;
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Ebml_Write(glob, &flags, 1);
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Ebml_Write(glob, data, dataLength);
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}
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static UInt64 generateTrackID(unsigned int trackNumber) {
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UInt64 t = time(NULL) * trackNumber;
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UInt64 r = rand();
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r = r << 32;
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r += rand();
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UInt64 rval = t ^ r;
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return rval;
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}
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void writeVideoTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing,
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char *codecId, unsigned int pixelWidth, unsigned int pixelHeight,
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double frameRate) {
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EbmlLoc start;
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Ebml_StartSubElement(glob, &start, TrackEntry);
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Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
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UInt64 trackID = generateTrackID(trackNumber);
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Ebml_SerializeUnsigned(glob, TrackUID, trackID);
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Ebml_SerializeString(glob, CodecName, "VP8"); // TODO shouldn't be fixed
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Ebml_SerializeUnsigned(glob, TrackType, 1); // video is always 1
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Ebml_SerializeString(glob, CodecID, codecId);
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{
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EbmlLoc videoStart;
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Ebml_StartSubElement(glob, &videoStart, Video);
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Ebml_SerializeUnsigned(glob, PixelWidth, pixelWidth);
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Ebml_SerializeUnsigned(glob, PixelHeight, pixelHeight);
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Ebml_SerializeFloat(glob, FrameRate, frameRate);
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Ebml_EndSubElement(glob, &videoStart); // Video
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}
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Ebml_EndSubElement(glob, &start); // Track Entry
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}
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void writeAudioTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing,
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char *codecId, double samplingFrequency, unsigned int channels,
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unsigned char *private, unsigned long privateSize) {
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EbmlLoc start;
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Ebml_StartSubElement(glob, &start, TrackEntry);
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Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
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UInt64 trackID = generateTrackID(trackNumber);
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Ebml_SerializeUnsigned(glob, TrackUID, trackID);
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Ebml_SerializeUnsigned(glob, TrackType, 2); // audio is always 2
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// I am using defaults for thesed required fields
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/* Ebml_SerializeUnsigned(glob, FlagEnabled, 1);
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Ebml_SerializeUnsigned(glob, FlagDefault, 1);
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Ebml_SerializeUnsigned(glob, FlagForced, 1);
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Ebml_SerializeUnsigned(glob, FlagLacing, flagLacing);*/
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Ebml_SerializeString(glob, CodecID, codecId);
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Ebml_SerializeData(glob, CodecPrivate, private, privateSize);
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Ebml_SerializeString(glob, CodecName, "VORBIS"); // fixed for now
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{
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EbmlLoc AudioStart;
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Ebml_StartSubElement(glob, &AudioStart, Audio);
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Ebml_SerializeFloat(glob, SamplingFrequency, samplingFrequency);
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Ebml_SerializeUnsigned(glob, Channels, channels);
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Ebml_EndSubElement(glob, &AudioStart);
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}
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Ebml_EndSubElement(glob, &start);
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}
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void writeSegmentInformation(EbmlGlobal *ebml, EbmlLoc *startInfo, unsigned long timeCodeScale, double duration) {
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Ebml_StartSubElement(ebml, startInfo, Info);
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Ebml_SerializeUnsigned(ebml, TimecodeScale, timeCodeScale);
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Ebml_SerializeFloat(ebml, Segment_Duration, duration * 1000.0); // Currently fixed to using milliseconds
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Ebml_SerializeString(ebml, 0x4D80, "QTmuxingAppLibWebM-0.0.1");
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Ebml_SerializeString(ebml, 0x5741, "QTwritingAppLibWebM-0.0.1");
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Ebml_EndSubElement(ebml, startInfo);
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}
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/*
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void Mkv_InitializeSegment(Ebml& ebml_out, EbmlLoc& ebmlLoc)
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{
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Ebml_StartSubElement(ebml_out, ebmlLoc, 0x18538067);
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}
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void Mkv_InitializeSeek(Ebml& ebml_out, EbmlLoc& ebmlLoc)
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{
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Ebml_StartSubElement(ebml_out, ebmlLoc, 0x114d9b74);
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}
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void Mkv_WriteSeekInformation(Ebml& ebml_out, SeekStruct& seekInformation)
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{
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EbmlLoc ebmlLoc;
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Ebml_StartSubElement(ebml_out, ebmlLoc, 0x4dbb);
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Ebml_SerializeString(ebml_out, 0x53ab, seekInformation.SeekID);
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Ebml_SerializeUnsigned(ebml_out, 0x53ac, seekInformation.SeekPosition);
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Ebml_EndSubElement(ebml_out, ebmlLoc);
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}
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void Mkv_WriteSegmentInformation(Ebml& ebml_out, SegmentInformationStruct& segmentInformation)
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{
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Ebml_SerializeUnsigned(ebml_out, 0x73a4, segmentInformation.segmentUID);
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if (segmentInformation.filename != 0)
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Ebml_SerializeString(ebml_out, 0x7384, segmentInformation.filename);
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Ebml_SerializeUnsigned(ebml_out, 0x2AD7B1, segmentInformation.TimecodeScale);
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Ebml_SerializeUnsigned(ebml_out, 0x4489, segmentInformation.Duration);
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// TODO date
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Ebml_SerializeWString(ebml_out, 0x4D80, L"MKVMUX");
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Ebml_SerializeWString(ebml_out, 0x5741, segmentInformation.WritingApp);
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}
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void Mkv_InitializeTrack(Ebml& ebml_out, EbmlLoc& ebmlLoc)
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{
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Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1654AE6B);
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}
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static void Mkv_WriteGenericTrackData(Ebml& ebml_out, TrackStruct& track)
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{
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Ebml_SerializeUnsigned(ebml_out, 0xD7, track.TrackNumber);
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Ebml_SerializeUnsigned(ebml_out, 0x73C5, track.TrackUID);
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Ebml_SerializeUnsigned(ebml_out, 0x83, track.TrackType);
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Ebml_SerializeUnsigned(ebml_out, 0xB9, track.FlagEnabled ? 1 :0);
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Ebml_SerializeUnsigned(ebml_out, 0x88, track.FlagDefault ? 1 :0);
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Ebml_SerializeUnsigned(ebml_out, 0x55AA, track.FlagForced ? 1 :0);
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if (track.Language != 0)
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Ebml_SerializeString(ebml_out, 0x22B59C, track.Language);
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if (track.CodecID != 0)
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Ebml_SerializeString(ebml_out, 0x86, track.CodecID);
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if (track.CodecPrivate != 0)
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Ebml_SerializeData(ebml_out, 0x63A2, track.CodecPrivate, track.CodecPrivateLength);
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if (track.CodecName != 0)
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Ebml_SerializeWString(ebml_out, 0x258688, track.CodecName);
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}
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void Mkv_WriteVideoTrack(Ebml& ebml_out, TrackStruct & track, VideoTrackStruct& video)
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{
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EbmlLoc trackHeadLoc, videoHeadLoc;
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Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); // start Track
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Mkv_WriteGenericTrackData(ebml_out, track);
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Ebml_StartSubElement(ebml_out, videoHeadLoc, 0xE0); // start Video
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Ebml_SerializeUnsigned(ebml_out, 0x9A, video.FlagInterlaced ? 1 :0);
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Ebml_SerializeUnsigned(ebml_out, 0xB0, video.PixelWidth);
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Ebml_SerializeUnsigned(ebml_out, 0xBA, video.PixelHeight);
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Ebml_SerializeUnsigned(ebml_out, 0x54B0, video.PixelDisplayWidth);
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Ebml_SerializeUnsigned(ebml_out, 0x54BA, video.PixelDisplayHeight);
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Ebml_SerializeUnsigned(ebml_out, 0x54B2, video.displayUnit);
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Ebml_SerializeFloat(ebml_out, 0x2383E3, video.FrameRate);
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Ebml_EndSubElement(ebml_out, videoHeadLoc);
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Ebml_EndSubElement(ebml_out, trackHeadLoc);
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}
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void Mkv_WriteAudioTrack(Ebml& ebml_out, TrackStruct & track, AudioTrackStruct& video)
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{
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EbmlLoc trackHeadLoc, audioHeadLoc;
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Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE);
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Mkv_WriteGenericTrackData(ebml_out, track);
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Ebml_StartSubElement(ebml_out, audioHeadLoc, 0xE0); // start Audio
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Ebml_SerializeFloat(ebml_out, 0xB5, video.SamplingFrequency);
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Ebml_SerializeUnsigned(ebml_out, 0x9F, video.Channels);
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Ebml_SerializeUnsigned(ebml_out, 0x6264, video.BitDepth);
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Ebml_EndSubElement(ebml_out, audioHeadLoc); // end audio
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Ebml_EndSubElement(ebml_out, trackHeadLoc);
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}
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void Mkv_WriteEbmlClusterHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, ClusterHeadStruct & clusterHead)
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{
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Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1F43B675);
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Ebml_SerializeUnsigned(ebml_out, 0x6264, clusterHead.TimeCode);
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}
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void Mkv_WriteSimpleBlockHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, SimpleBlockStruct& block)
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{
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Ebml_StartSubElement(ebml_out, ebmlLoc, 0xA3);
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Ebml_Write1UInt(ebml_out, block.TrackNumber);
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Ebml_WriteSigned16(ebml_out,block.TimeCode);
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unsigned char flags = 0x00 | (block.iskey ? 0x80:0x00) | (block.lacing << 1) | block.discardable;
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Ebml_Write1UInt(ebml_out, flags); // TODO this may be the wrong function
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Ebml_Serialize(ebml_out, block.data, block.dataLength);
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Ebml_EndSubElement(ebml_out,ebmlLoc);
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}
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*/
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