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Aegisub/FFmpegSource/ffmatroskaaudiosource.cpp

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// Copyright (c) 2007-2008 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 "ffmpegsource.h"
int FFMatroskaAudioSource::GetTrackIndex(int Index, unsigned char ATrackType, IScriptEnvironment *Env) {
if (Index == -1)
for (unsigned int i = 0; i < mkv_GetNumTracks(MF); i++)
if (mkv_GetTrackInfo(MF, i)->Type == ATrackType) {
Index = i;
break;
}
if (Index == -1)
Env->ThrowError("FFmpegSource: No %s track found", (ATrackType & TT_VIDEO) ? "video" : "audio");
if (Index <= -2)
return -2;
if (Index >= (int)mkv_GetNumTracks(MF))
Env->ThrowError("FFmpegSource: Invalid %s track number", (ATrackType & TT_VIDEO) ? "video" : "audio");
TrackInfo *TI = mkv_GetTrackInfo(MF, Index);
if (TI->Type != ATrackType)
Env->ThrowError("FFmpegSource: Selected track is not %s", (ATrackType & TT_VIDEO) ? "video" : "audio");
return Index;
}
FFMatroskaAudioSource::FFMatroskaAudioSource(const char *ASource, int AAudioTrack, const char *AAudioCache, IScriptEnvironment *Env) {
int AudioTrack;
AudioCodecContext = NULL;
AVCodec *AudioCodec = NULL;
TrackInfo *VideoTI = NULL;
BufferSize = 0;
Buffer = NULL;
AudioCS = NULL;
memset(&ST,0,sizeof(ST));
ST.base.read = (int (__cdecl *)(InputStream *,ulonglong,void *,int))StdIoRead;
ST.base.scan = (longlong (__cdecl *)(InputStream *,ulonglong,unsigned int))StdIoScan;
ST.base.getcachesize = (unsigned int (__cdecl *)(InputStream *))StdIoGetCacheSize;
ST.base.geterror = (const char *(__cdecl *)(InputStream *))StdIoGetLastError;
ST.base.memalloc = (void *(__cdecl *)(InputStream *,size_t))StdIoMalloc;
ST.base.memrealloc = (void *(__cdecl *)(InputStream *,void *,size_t))StdIoRealloc;
ST.base.memfree = (void (__cdecl *)(InputStream *,void *)) StdIoFree;
ST.base.progress = (int (__cdecl *)(InputStream *,ulonglong,ulonglong))StdIoProgress;
ST.fp = fopen(ASource, "rb");
if (ST.fp == NULL)
Env->ThrowError("FFmpegSource: Can't open '%s': %s", ASource, strerror(errno));
setvbuf(ST.fp, NULL, _IOFBF, CACHESIZE);
MF = mkv_OpenEx(&ST.base, 0, 0, ErrorMessage, sizeof(ErrorMessage));
if (MF == NULL) {
fclose(ST.fp);
Env->ThrowError("FFmpegSource: Can't parse Matroska file: %s", ErrorMessage);
}
AudioTrack = GetTrackIndex(AAudioTrack, TT_AUDIO, Env);
mkv_SetTrackMask(MF, ~(1 << AudioTrack));
TrackInfo *AudioTI = mkv_GetTrackInfo(MF, AudioTrack);
if (AudioTI->CompEnabled) {
AudioCS = cs_Create(MF, AudioTrack, ErrorMessage, sizeof(ErrorMessage));
if (AudioCS == NULL)
Env->ThrowError("FFmpegSource: Can't create decompressor: %s", ErrorMessage);
}
AudioCodecContext = avcodec_alloc_context();
AudioCodecContext->extradata = (uint8_t *)AudioTI->CodecPrivate;
AudioCodecContext->extradata_size = AudioTI->CodecPrivateSize;
AudioCodec = avcodec_find_decoder(MatroskaToFFCodecID(AudioTI));
if (AudioCodec == NULL)
Env->ThrowError("FFmpegSource: Audio codec not found");
if (avcodec_open(AudioCodecContext, AudioCodec) < 0)
Env->ThrowError("FFmpegSource: Could not open audio codec");
// Fix for ac3 and other codecs where decoding a block of audio is required to get information about it
if (AudioCodecContext->channels == 0 || AudioCodecContext->sample_rate == 0) {
uint64_t StartTime, EndTime, FilePos;
unsigned int Track, FrameFlags, FrameSize;
mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags);
int Size = ReadFrame(FilePos, FrameSize, AudioCS, Env);
uint8_t *Data = Buffer;
while (Size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
int Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)DecodingBuffer, &TempOutputBufSize, Data, Size);
if (Ret < 0)
Env->ThrowError("FFmpegSource: Audio decoding error");
Size -= Ret;
Data += Ret;
}
mkv_Seek(MF, 0, MKVF_SEEK_TO_PREV_KEYFRAME);
avcodec_flush_buffers(AudioCodecContext);
}
VI.nchannels = AudioCodecContext->channels;
VI.audio_samples_per_second = AudioCodecContext->sample_rate;
switch (AudioCodecContext->sample_fmt) {
case SAMPLE_FMT_U8: VI.sample_type = SAMPLE_INT8; break;
case SAMPLE_FMT_S16: VI.sample_type = SAMPLE_INT16; break;
case SAMPLE_FMT_S24: VI.sample_type = SAMPLE_INT24; break;
case SAMPLE_FMT_S32: VI.sample_type = SAMPLE_INT32; break;
case SAMPLE_FMT_FLT: VI.sample_type = SAMPLE_FLOAT; break;
default:
Env->ThrowError("FFmpegSource: Unsupported/unknown sample format");
}
//load audio cache
bool ACacheIsValid = LoadSampleInfoFromFile(AAudioCache, ASource, AudioTrack);
// Needs to be indexed?
if (!ACacheIsValid) {
uint64_t StartTime, EndTime, FilePos;
unsigned int Track, FrameFlags, FrameSize;
while (mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags) == 0) {
SI.push_back(SampleInfo(VI.num_audio_samples, FilePos, FrameSize, (FrameFlags & FRAME_KF) != 0));
if (AudioCodecContext->frame_size > 0) {
VI.num_audio_samples += AudioCodecContext->frame_size;
} else {
int Size = ReadFrame(FilePos, FrameSize, AudioCS, Env);
uint8_t *Data = Buffer;
while (Size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
int Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)DecodingBuffer, &TempOutputBufSize, Data, Size);
if (Ret < 0)
Env->ThrowError("FFmpegSource: Audio decoding error");
if (Ret > 0) {
int DecodedSamples = (int)VI.AudioSamplesFromBytes(TempOutputBufSize);
Size -= Ret;
Data += Ret;
VI.num_audio_samples += DecodedSamples;
}
}
}
}
mkv_Seek(MF, 0, MKVF_SEEK_TO_PREV_KEYFRAME);
avcodec_flush_buffers(AudioCodecContext);
if (!SaveSampleInfoToFile(AAudioCache, ASource, AudioTrack))
Env->ThrowError("FFmpegSource: Failed to save audio cache index");
}
if (VI.num_audio_samples == 0)
Env->ThrowError("FFmpegSource: Audio track contains no samples");
}
FFMatroskaAudioSource::~FFMatroskaAudioSource() {
free(Buffer);
mkv_Close(MF);
fclose(ST.fp);
if (AudioCodecContext)
avcodec_close(AudioCodecContext);
av_free(AudioCodecContext);
}
int FFMatroskaAudioSource::ReadFrame(uint64_t AFilePos, unsigned int AFrameSize, CompressedStream *ACS, IScriptEnvironment *Env) {
if (ACS) {
char CSBuffer[4096];
unsigned int DecompressedFrameSize = 0;
cs_NextFrame(ACS, AFilePos, AFrameSize);
for (;;) {
int ReadBytes = cs_ReadData(ACS, CSBuffer, sizeof(CSBuffer));
if (ReadBytes < 0)
Env->ThrowError("FFmpegSource: Error decompressing data: %s", cs_GetLastError(ACS));
if (ReadBytes == 0) {
return DecompressedFrameSize;
}
if (BufferSize < DecompressedFrameSize + ReadBytes) {
BufferSize = AFrameSize;
Buffer = (uint8_t *)realloc(Buffer, BufferSize);
if (Buffer == NULL)
Env->ThrowError("FFmpegSource: Out of memory");
}
memcpy(Buffer + DecompressedFrameSize, CSBuffer, ReadBytes);
DecompressedFrameSize += ReadBytes;
}
} else {
if (_fseeki64(ST.fp, AFilePos, SEEK_SET))
Env->ThrowError("FFmpegSource: fseek(): %s", strerror(errno));
if (BufferSize < AFrameSize) {
BufferSize = AFrameSize;
Buffer = (uint8_t *)realloc(Buffer, BufferSize);
if (Buffer == NULL)
Env->ThrowError("FFmpegSource: Out of memory");
}
size_t ReadBytes = fread(Buffer, 1, AFrameSize, ST.fp);
if (ReadBytes != AFrameSize) {
if (ReadBytes == 0) {
if (feof(ST.fp))
Env->ThrowError("FFmpegSource: Unexpected EOF while reading frame");
else
Env->ThrowError("FFmpegSource: Error reading frame: %s", strerror(errno));
} else
Env->ThrowError("FFmpegSource: Short read while reading frame");
Env->ThrowError("FFmpegSource: Unknown read error");
}
return AFrameSize;
}
return 0;
}
void __stdcall FFMatroskaAudioSource::GetAudio(void* Buf, __int64 Start, __int64 Count, IScriptEnvironment *Env) {
size_t CurrentAudioBlock = FFMAX((int64_t)FindClosestAudioKeyFrame(Start) - 10, (int64_t)0);
avcodec_flush_buffers(AudioCodecContext);
memset(Buf, 0, VI.BytesFromAudioSamples(Count));
uint8_t *DstBuf = (uint8_t *)Buf;
int64_t RemainingSamples = Count;
int64_t DecodeCount;
do {
int64_t DecodeStart = SI[CurrentAudioBlock].SampleStart;
int Ret = DecodeNextAudioBlock(DecodingBuffer, &DecodeCount, SI[CurrentAudioBlock].FilePos, SI[CurrentAudioBlock].FrameSize, Env);
if (Ret < 0)
Env->ThrowError("Bleh, bad audio decoding");
CurrentAudioBlock++;
int64_t OffsetBytes = VI.BytesFromAudioSamples(FFMAX(0, Start - DecodeStart));
int64_t CopyBytes = FFMAX(0, VI.BytesFromAudioSamples(FFMIN(RemainingSamples, DecodeCount - FFMAX(0, Start - DecodeStart))));
memcpy(DstBuf, DecodingBuffer + OffsetBytes, CopyBytes);
DstBuf += CopyBytes;
RemainingSamples -= VI.AudioSamplesFromBytes(CopyBytes);
} while (RemainingSamples > 0 && CurrentAudioBlock < SI.size());
}
int FFMatroskaAudioSource::DecodeNextAudioBlock(uint8_t *ABuf, int64_t *ACount, uint64_t AFilePos, unsigned int AFrameSize, IScriptEnvironment *Env) {
int Ret = -1;
*ACount = 0;
int FrameSize = ReadFrame(AFilePos, AFrameSize, AudioCS, Env);
uint8_t *Data = Buffer;
int Size = FrameSize;
while (Size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)ABuf, &TempOutputBufSize, Data, Size);
if (Ret < 0) // throw error or something?
goto Done;
if (Ret > 0) {
Size -= Ret;
Data += Ret;
ABuf += TempOutputBufSize;
*ACount += VI.AudioSamplesFromBytes(TempOutputBufSize);
}
}
Done:
return Ret;
}
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