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Aegisub/aegisub/FFmpegSource2/ffaudiosource.cpp

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// Copyright (c) 2007-2009 Fredrik Mellbin
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "ffaudiosource.h"
#include <errno.h>
#ifdef __UNIX__
#define _snprintf snprintf
#endif
TAudioBlock::TAudioBlock(int64_t Start, int64_t Samples, uint8_t *SrcData, size_t SrcBytes) {
this->Start = Start;
this->Samples = Samples;
Data = new uint8_t[SrcBytes];
memcpy(Data, SrcData, SrcBytes);
}
TAudioBlock::~TAudioBlock() {
delete[] Data;
}
TAudioCache::TAudioCache() {
MaxCacheBlocks = 0;
BytesPerSample = 0;
}
TAudioCache::~TAudioCache() {
for (TAudioCache::iterator it=begin(); it != end(); it++)
delete *it;
}
void TAudioCache::Initialize(int BytesPerSample, int MaxCacheBlocks) {
this->BytesPerSample = BytesPerSample;
this->MaxCacheBlocks = MaxCacheBlocks;
}
void TAudioCache::CacheBlock(int64_t Start, int64_t Samples, uint8_t *SrcData) {
if (BytesPerSample > 0) {
for (TAudioCache::iterator it=begin(); it != end(); it++) {
if ((*it)->Start == Start) {
delete *it;
erase(it);
break;
}
}
push_front(new TAudioBlock(Start, Samples, SrcData, Samples * BytesPerSample));
if (static_cast<int>(size()) >= MaxCacheBlocks) {
delete back();
pop_back();
}
}
}
bool TAudioCache::AudioBlockComp(TAudioBlock *A, TAudioBlock *B) {
return A->Start < B->Start;
}
int64_t TAudioCache::FillRequest(int64_t Start, int64_t Samples, uint8_t *Dst) {
// May be better to move used blocks to the front
std::list<TAudioBlock *> UsedBlocks;
for (TAudioCache::iterator it=begin(); it != end(); it++) {
int64_t SrcOffset = FFMAX(0, Start - (*it)->Start);
int64_t DstOffset = FFMAX(0, (*it)->Start - Start);
int64_t CopySamples = FFMIN((*it)->Samples - SrcOffset, Samples - DstOffset);
if (CopySamples > 0) {
memcpy(Dst + DstOffset * BytesPerSample, (*it)->Data + SrcOffset * BytesPerSample, CopySamples * BytesPerSample);
UsedBlocks.push_back(*it);
}
}
UsedBlocks.sort(AudioBlockComp);
int64_t Ret = Start;
for (std::list<TAudioBlock *>::iterator it = UsedBlocks.begin(); it != UsedBlocks.end(); it++) {
if (it == UsedBlocks.begin() || Ret == (*it)->Start)
Ret = (*it)->Start + (*it)->Samples;
else
break;
}
return FFMIN(Ret, Start + Samples);
}
FFAudio::FFAudio() {
CurrentSample = 0;
DecodingBuffer = new uint8_t[AVCODEC_MAX_AUDIO_FRAME_SIZE * 10];
}
FFAudio::~FFAudio() {
delete[] DecodingBuffer;
}
void FFLAVFAudio::Free(bool CloseCodec) {
if (CloseCodec)
avcodec_close(CodecContext);
if (FormatContext)
av_close_input_file(FormatContext);
}
FFLAVFAudio::FFLAVFAudio(const char *SourceFile, int Track, FFIndex *Index, char *ErrorMsg, unsigned MsgSize) {
FormatContext = NULL;
AVCodec *Codec = NULL;
AudioTrack = Track;
Frames = (*Index)[AudioTrack];
if (Frames.size() == 0) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Audio track contains no frames, was it indexed properly?");
throw ErrorMsg;
}
if (av_open_input_file(&FormatContext, SourceFile, NULL, 0, NULL) != 0) {
_snprintf(ErrorMsg, MsgSize, "Couldn't open '%s'", SourceFile);
throw ErrorMsg;
}
if (av_find_stream_info(FormatContext) < 0) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Couldn't find stream information");
throw ErrorMsg;
}
CodecContext = FormatContext->streams[AudioTrack]->codec;
Codec = avcodec_find_decoder(CodecContext->codec_id);
if (Codec == NULL) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Audio codec not found");
throw ErrorMsg;
}
if (avcodec_open(CodecContext, Codec) < 0) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Could not open audio codec");
throw ErrorMsg;
}
// Always try to decode a frame to make sure all required parameters are known
int64_t Dummy;
if (DecodeNextAudioBlock(&Dummy, ErrorMsg, MsgSize) < 0) {
Free(true);
throw ErrorMsg;
}
if (av_seek_frame(FormatContext, AudioTrack, Frames[0].DTS, AVSEEK_FLAG_BACKWARD) < 0)
av_seek_frame(FormatContext, AudioTrack, Frames[0].DTS, AVSEEK_FLAG_BACKWARD | AVSEEK_FLAG_ANY);
avcodec_flush_buffers(CodecContext);
FillAP(AP, CodecContext, Frames);
if (AP.SampleRate <= 0 || AP.BitsPerSample <= 0) {
Free(true);
_snprintf(ErrorMsg, MsgSize, "Codec returned zero size audio");
throw ErrorMsg;
}
AudioCache.Initialize((AP.Channels * AP.BitsPerSample) / 8, 50);
}
int FFLAVFAudio::DecodeNextAudioBlock(int64_t *Count, char *ErrorMsg, unsigned MsgSize) {
const size_t SizeConst = (av_get_bits_per_sample_format(CodecContext->sample_fmt) * CodecContext->channels) / 8;
int Ret = -1;
*Count = 0;
uint8_t *Buf = DecodingBuffer;
AVPacket Packet, TempPacket;
InitNullPacket(&Packet);
InitNullPacket(&TempPacket);
while (av_read_frame(FormatContext, &Packet) >= 0) {
if (Packet.stream_index == AudioTrack) {
TempPacket.data = Packet.data;
TempPacket.size = Packet.size;
while (TempPacket.size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE * 10;
Ret = avcodec_decode_audio3(CodecContext, (int16_t *)Buf, &TempOutputBufSize, &TempPacket);
if (Ret < 0) {// throw error or something?
av_free_packet(&Packet);
goto Done;
}
if (Ret > 0) {
TempPacket.size -= Ret;
TempPacket.data += Ret;
Buf += TempOutputBufSize;
if (SizeConst)
*Count += TempOutputBufSize / SizeConst;
}
}
av_free_packet(&Packet);
goto Done;
}
av_free_packet(&Packet);
}
Done:
return Ret;
}
int FFLAVFAudio::GetAudio(void *Buf, int64_t Start, int64_t Count, char *ErrorMsg, unsigned MsgSize) {
const int64_t SizeConst = (av_get_bits_per_sample_format(CodecContext->sample_fmt) * CodecContext->channels) / 8;
memset(Buf, 0, SizeConst * Count);
int PreDecBlocks = 0;
uint8_t *DstBuf = static_cast<uint8_t *>(Buf);
// Fill with everything in the cache
int64_t CacheEnd = AudioCache.FillRequest(Start, Count, DstBuf);
// Was everything in the cache?
if (CacheEnd == Start + Count)
return 0;
size_t CurrentAudioBlock;
// Is seeking required to decode the requested samples?
// if (!(CurrentSample >= Start && CurrentSample <= CacheEnd)) {
if (CurrentSample != CacheEnd) {
PreDecBlocks = 15;
CurrentAudioBlock = FFMAX((int64_t)Frames.FindClosestAudioKeyFrame(CacheEnd) - PreDecBlocks - 20, (int64_t)0);
// Did the seeking fail?
if (av_seek_frame(FormatContext, AudioTrack, Frames[CurrentAudioBlock].DTS, AVSEEK_FLAG_BACKWARD) < 0)
av_seek_frame(FormatContext, AudioTrack, Frames[CurrentAudioBlock].DTS, AVSEEK_FLAG_BACKWARD | AVSEEK_FLAG_ANY);
avcodec_flush_buffers(CodecContext);
AVPacket Packet;
InitNullPacket(&Packet);
// Establish where we actually are
// Trigger on packet dts difference since groups can otherwise be indistinguishable
int64_t LastDTS = - 1;
while (av_read_frame(FormatContext, &Packet) >= 0) {
if (Packet.stream_index == AudioTrack) {
if (LastDTS < 0) {
LastDTS = Packet.dts;
} else if (LastDTS != Packet.dts) {
for (size_t i = 0; i < Frames.size(); i++)
if (Frames[i].DTS == Packet.dts) {
// The current match was consumed
CurrentAudioBlock = i + 1;
break;
}
av_free_packet(&Packet);
break;
}
}
av_free_packet(&Packet);
}
} else {
CurrentAudioBlock = Frames.FindClosestAudioKeyFrame(CurrentSample);
}
int64_t DecodeCount;
do {
int Ret = DecodeNextAudioBlock(&DecodeCount, ErrorMsg, MsgSize);
if (Ret < 0) {
// FIXME
//Env->ThrowError("Bleh, bad audio decoding");
}
// Cache the block if enough blocks before it have been decoded to avoid garbage
if (PreDecBlocks == 0) {
AudioCache.CacheBlock(Frames[CurrentAudioBlock].SampleStart, DecodeCount, DecodingBuffer);
CacheEnd = AudioCache.FillRequest(CacheEnd, Start + Count - CacheEnd, DstBuf + (CacheEnd - Start) * SizeConst);
} else {
PreDecBlocks--;
}
CurrentAudioBlock++;
if (CurrentAudioBlock < Frames.size())
CurrentSample = Frames[CurrentAudioBlock].SampleStart;
} while (Start + Count - CacheEnd > 0 && CurrentAudioBlock < Frames.size());
return 0;
}
FFLAVFAudio::~FFLAVFAudio() {
Free(true);
}
void FFMatroskaAudio::Free(bool CloseCodec) {
if (CS)
cs_Destroy(CS);
if (MC.ST.fp) {
mkv_Close(MF);
fclose(MC.ST.fp);
}
if (CloseCodec)
avcodec_close(CodecContext);
av_free(CodecContext);
}
FFMatroskaAudio::FFMatroskaAudio(const char *SourceFile, int Track, FFIndex *Index, char *ErrorMsg, unsigned MsgSize) {
CodecContext = NULL;
AVCodec *Codec = NULL;
TrackInfo *TI = NULL;
CS = NULL;
Frames = (*Index)[Track];
if (Frames.size() == 0) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Audio track contains no frames, was it indexed properly?");
throw ErrorMsg;
}
MC.ST.fp = fopen(SourceFile, "rb");
if (MC.ST.fp == NULL) {
_snprintf(ErrorMsg, MsgSize, "Can't open '%s': %s", SourceFile, strerror(errno));
throw ErrorMsg;
}
setvbuf(MC.ST.fp, NULL, _IOFBF, CACHESIZE);
MF = mkv_OpenEx(&MC.ST.base, 0, 0, ErrorMessage, sizeof(ErrorMessage));
if (MF == NULL) {
fclose(MC.ST.fp);
_snprintf(ErrorMsg, MsgSize, "Can't parse Matroska file: %s", ErrorMessage);
throw ErrorMsg;
}
mkv_SetTrackMask(MF, ~(1 << Track));
TI = mkv_GetTrackInfo(MF, Track);
if (TI->CompEnabled) {
CS = cs_Create(MF, Track, ErrorMessage, sizeof(ErrorMessage));
if (CS == NULL) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Can't create decompressor: %s", ErrorMessage);
throw ErrorMsg;
}
}
CodecContext = avcodec_alloc_context();
CodecContext->extradata = (uint8_t *)TI->CodecPrivate;
CodecContext->extradata_size = TI->CodecPrivateSize;
Codec = avcodec_find_decoder(MatroskaToFFCodecID(TI->CodecID, TI->CodecPrivate));
if (Codec == NULL) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Video codec not found");
throw ErrorMsg;
}
if (avcodec_open(CodecContext, Codec) < 0) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Could not open video codec");
throw ErrorMsg;
}
// Always try to decode a frame to make sure all required parameters are known
int64_t Dummy;
if (DecodeNextAudioBlock(&Dummy, 0, ErrorMsg, MsgSize) < 0) {
Free(true);
throw ErrorMsg;
}
avcodec_flush_buffers(CodecContext);
FillAP(AP, CodecContext, Frames);
if (AP.SampleRate <= 0 || AP.BitsPerSample <= 0) {
Free(true);
_snprintf(ErrorMsg, MsgSize, "Codec returned zero size audio");
throw ErrorMsg;
}
AudioCache.Initialize((AP.Channels * AP.BitsPerSample) / 8, 50);
}
FFMatroskaAudio::~FFMatroskaAudio() {
Free(true);
}
int FFMatroskaAudio::GetAudio(void *Buf, int64_t Start, int64_t Count, char *ErrorMsg, unsigned MsgSize) {
const int64_t SizeConst = (av_get_bits_per_sample_format(CodecContext->sample_fmt) * CodecContext->channels) / 8;
memset(Buf, 0, SizeConst * Count);
int PreDecBlocks = 0;
uint8_t *DstBuf = static_cast<uint8_t *>(Buf);
// Fill with everything in the cache
int64_t CacheEnd = AudioCache.FillRequest(Start, Count, DstBuf);
// Was everything in the cache?
if (CacheEnd == Start + Count)
return 0;
int CurrentAudioBlock;
// Is seeking required to decode the requested samples?
// if (!(CurrentSample >= Start && CurrentSample <= CacheEnd)) {
if (CurrentSample != CacheEnd) {
PreDecBlocks = 15;
CurrentAudioBlock = FFMAX((int64_t)Frames.FindClosestAudioKeyFrame(CacheEnd) - PreDecBlocks, (int64_t)0);
avcodec_flush_buffers(CodecContext);
} else {
CurrentAudioBlock = Frames.FindClosestAudioKeyFrame(CurrentSample);
}
int64_t DecodeCount;
do {
int Ret = DecodeNextAudioBlock(&DecodeCount, CurrentAudioBlock, ErrorMsg, MsgSize);
if (Ret < 0) {
// FIXME
//Env->ThrowError("Bleh, bad audio decoding");
}
// Cache the block if enough blocks before it have been decoded to avoid garbage
if (PreDecBlocks == 0) {
AudioCache.CacheBlock(Frames[CurrentAudioBlock].SampleStart, DecodeCount, DecodingBuffer);
CacheEnd = AudioCache.FillRequest(CacheEnd, Start + Count - CacheEnd, DstBuf + (CacheEnd - Start) * SizeConst);
} else {
PreDecBlocks--;
}
CurrentAudioBlock++;
if (CurrentAudioBlock < static_cast<int>(Frames.size()))
CurrentSample = Frames[CurrentAudioBlock].SampleStart;
} while (Start + Count - CacheEnd > 0 && CurrentAudioBlock < static_cast<int>(Frames.size()));
return 0;
}
int FFMatroskaAudio::DecodeNextAudioBlock(int64_t *Count, int AudioBlock, char *ErrorMsg, unsigned MsgSize) {
const size_t SizeConst = (av_get_bits_per_sample_format(CodecContext->sample_fmt) * CodecContext->channels) / 8;
int Ret = -1;
*Count = 0;
uint8_t *Buf = DecodingBuffer;
AVPacket TempPacket;
InitNullPacket(&TempPacket);
unsigned int FrameSize = Frames[AudioBlock].FrameSize;
if (ReadFrame(Frames[AudioBlock].FilePos, FrameSize, CS, MC, ErrorMsg, MsgSize))
return 1;
TempPacket.data = MC.Buffer;
TempPacket.size = FrameSize;
if (Frames[AudioBlock].KeyFrame)
TempPacket.flags = PKT_FLAG_KEY;
else
TempPacket.flags = 0;
while (TempPacket.size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
Ret = avcodec_decode_audio3(CodecContext, (int16_t *)Buf, &TempOutputBufSize, &TempPacket);
if (Ret < 0) // throw error or something?
goto Done;
if (Ret > 0) {
TempPacket.size -= Ret;
TempPacket.data += Ret;
Buf += TempOutputBufSize;
if (SizeConst)
*Count += TempOutputBufSize / SizeConst;
}
}
Done:
return 0;
}
#ifdef HAALISOURCE
void FFHaaliAudio::Free(bool CloseCodec) {
if (CloseCodec)
avcodec_close(CodecContext);
av_free(CodecContext);
delete[] CodecPrivate;
}
int FFHaaliAudio::DecodeNextAudioBlock(int64_t *AFirstStartTime, int64_t *Count, char *ErrorMsg, unsigned MsgSize) {
const size_t SizeConst = (av_get_bits_per_sample_format(CodecContext->sample_fmt) * CodecContext->channels) / 8;
int Ret = -1;
*AFirstStartTime = -1;
*Count = 0;
uint8_t *Buf = DecodingBuffer;
AVPacket Packet;
InitNullPacket(&Packet);
for (;;) {
CComPtr<IMMFrame> pMMF;
if (pMMC->ReadFrame(NULL, &pMMF) != S_OK)
break;
REFERENCE_TIME Ts, Te;
if (*AFirstStartTime < 0 && SUCCEEDED(pMMF->GetTime(&Ts, &Te)))
*AFirstStartTime = Ts;
if (pMMF->GetTrack() == AudioTrack) {
BYTE *Data = NULL;
if (FAILED(pMMF->GetPointer(&Data)))
goto Done;
Packet.data = Data;
Packet.size = pMMF->GetActualDataLength();
if (pMMF->IsSyncPoint() == S_OK)
Packet.flags = PKT_FLAG_KEY;
else
Packet.flags = 0;
while (Packet.size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE * 10;
Ret = avcodec_decode_audio3(CodecContext, (int16_t *)Buf, &TempOutputBufSize, &Packet);
if (Ret < 0) {// throw error or something?
goto Done;
}
if (Ret > 0) {
Packet.size -= Ret;
Packet.data += Ret;
Buf += TempOutputBufSize;
if (SizeConst)
*Count += TempOutputBufSize / SizeConst;
}
}
goto Done;
}
}
Done:
return Ret;
}
FFHaaliAudio::FFHaaliAudio(const char *SourceFile, int Track, FFIndex *Index, int SourceMode, char *ErrorMsg, unsigned MsgSize) {
CodecPrivate = NULL;
AVCodec *Codec = NULL;
CodecContext = NULL;
AudioTrack = Track;
Frames = (*Index)[AudioTrack];
if (Frames.size() == 0) {
_snprintf(ErrorMsg, MsgSize, "Audio track contains no frames, was it indexed properly?");
throw ErrorMsg;
}
CLSID clsid = HAALI_TS_Parser;
if (SourceMode == 1)
clsid = HAALI_OGM_Parser;
if (FAILED(pMMC.CoCreateInstance(clsid))) {
_snprintf(ErrorMsg, MsgSize, "Can't create parser");
throw ErrorMsg;
}
CComPtr<IMemAlloc> pMA;
if (FAILED(pMA.CoCreateInstance(CLSID_MemAlloc))) {
_snprintf(ErrorMsg, MsgSize, "Can't create memory allocator");
throw ErrorMsg;
}
CComPtr<IMMStream> pMS;
if (FAILED(pMS.CoCreateInstance(CLSID_DiskFile))) {
_snprintf(ErrorMsg, MsgSize, "Can't create disk file reader");
throw ErrorMsg;
}
WCHAR WSourceFile[2048];
mbstowcs(WSourceFile, SourceFile, 2000);
CComQIPtr<IMMStreamOpen> pMSO(pMS);
if (FAILED(pMSO->Open(WSourceFile))) {
_snprintf(ErrorMsg, MsgSize, "Can't open file");
throw ErrorMsg;
}
if (FAILED(pMMC->Open(pMS, 0, NULL, pMA))) {
_snprintf(ErrorMsg, MsgSize, "Can't parse file");
throw ErrorMsg;
}
int CodecPrivateSize = 0;
int CurrentTrack = 0;
CComPtr<IEnumUnknown> pEU;
CComQIPtr<IPropertyBag> pBag;
if (SUCCEEDED(pMMC->EnumTracks(&pEU))) {
CComPtr<IUnknown> pU;
while (pEU->Next(1, &pU, NULL) == S_OK) {
if (CurrentTrack++ == Track) {
pBag = pU;
if (pBag) {
CComVariant pV;
pV.Clear();
if (SUCCEEDED(pBag->Read(L"CodecPrivate", &pV, NULL))) {
CodecPrivateSize = vtSize(pV);
CodecPrivate = new uint8_t[CodecPrivateSize];
vtCopy(pV, CodecPrivate);
}
pV.Clear();
if (SUCCEEDED(pBag->Read(L"CodecID", &pV, NULL)) && SUCCEEDED(pV.ChangeType(VT_BSTR))) {
char ACodecID[2048];
wcstombs(ACodecID, pV.bstrVal, 2000);
Codec = avcodec_find_decoder(MatroskaToFFCodecID(ACodecID, CodecPrivate));
}
}
}
pU = NULL;
}
}
CodecContext = avcodec_alloc_context();
CodecContext->extradata = CodecPrivate;
CodecContext->extradata_size = CodecPrivateSize;
if (Codec == NULL) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Audio codec not found");
throw ErrorMsg;
}
if (avcodec_open(CodecContext, Codec) < 0) {
Free(false);
_snprintf(ErrorMsg, MsgSize, "Could not open audio codec");
throw ErrorMsg;
}
// Always try to decode a frame to make sure all required parameters are known
int64_t Dummy1, Dummy2;
if (DecodeNextAudioBlock(&Dummy1, &Dummy2, ErrorMsg, MsgSize) < 0) {
Free(true);
throw ErrorMsg;
}
pMMC->Seek(Frames[0].DTS, MKVF_SEEK_TO_PREV_KEYFRAME_STRICT);
avcodec_flush_buffers(CodecContext);
FillAP(AP, CodecContext, Frames);
if (AP.SampleRate <= 0 || AP.BitsPerSample <= 0) {
Free(true);
_snprintf(ErrorMsg, MsgSize, "Codec returned zero size audio");
throw ErrorMsg;
}
AudioCache.Initialize((AP.Channels * AP.BitsPerSample) / 8, 50);
}
FFHaaliAudio::~FFHaaliAudio() {
Free(true);
}
int FFHaaliAudio::GetAudio(void *Buf, int64_t Start, int64_t Count, char *ErrorMsg, unsigned MsgSize) {
const int64_t SizeConst = (av_get_bits_per_sample_format(CodecContext->sample_fmt) * CodecContext->channels) / 8;
memset(Buf, 0, SizeConst * Count);
bool HasSeeked = false;
int PreDecBlocks = 0;
uint8_t *DstBuf = static_cast<uint8_t *>(Buf);
// Fill with everything in the cache
int64_t CacheEnd = AudioCache.FillRequest(Start, Count, DstBuf);
// Was everything in the cache?
if (CacheEnd == Start + Count)
return 0;
int CurrentAudioBlock;
// Is seeking required to decode the requested samples?
// if (!(CurrentSample >= Start && CurrentSample <= CacheEnd)) {
if (CurrentSample != CacheEnd) {
PreDecBlocks = 15;
CurrentAudioBlock = FFMAX((int64_t)Frames.FindClosestAudioKeyFrame(CacheEnd) - PreDecBlocks - 20, (int64_t)0);
pMMC->Seek(Frames[CurrentAudioBlock].DTS, MKVF_SEEK_TO_PREV_KEYFRAME_STRICT);
avcodec_flush_buffers(CodecContext);
HasSeeked = true;
} else {
CurrentAudioBlock = Frames.FindClosestAudioKeyFrame(CurrentSample);
}
int64_t FirstTime, DecodeCount;
do {
int Ret = DecodeNextAudioBlock(&FirstTime, &DecodeCount, ErrorMsg, MsgSize);
if (Ret < 0) {
// FIXME
//Env->ThrowError("Bleh, bad audio decoding");
}
if (HasSeeked) {
CurrentAudioBlock = Frames.ClosestFrameFromDTS(FirstTime);
HasSeeked = false;
}
// Cache the block if enough blocks before it have been decoded to avoid garbage
if (PreDecBlocks == 0) {
AudioCache.CacheBlock(Frames[CurrentAudioBlock].SampleStart, DecodeCount, DecodingBuffer);
CacheEnd = AudioCache.FillRequest(CacheEnd, Start + Count - CacheEnd, DstBuf + (CacheEnd - Start) * SizeConst);
} else {
PreDecBlocks--;
}
CurrentAudioBlock++;
if (CurrentAudioBlock < static_cast<int>(Frames.size()))
CurrentSample = Frames[CurrentAudioBlock].SampleStart;
} while (Start + Count - CacheEnd > 0 && CurrentAudioBlock < static_cast<int>(Frames.size()));
return 0;
}
#endif // HAALISOURCE
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