Aegisub/FFmpegSource/ffmpegaudiosource.cpp

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// Copyright (c) 2007 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 FFmpegAudioSource::GetTrackIndex(int Index, CodecType ATrackType, IScriptEnvironment *Env) {
if (Index == -1)
for (unsigned int i = 0; i < FormatContext->nb_streams; i++)
if (FormatContext->streams[i]->codec->codec_type == ATrackType) {
Index = i;
break;
}
if (Index == -1)
Env->ThrowError("FFmpegSource: No %s track found", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
if (Index <= -2)
return -2;
if (Index >= (int)FormatContext->nb_streams)
Env->ThrowError("FFmpegSource: Invalid %s track number", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
if (FormatContext->streams[Index]->codec->codec_type != ATrackType)
Env->ThrowError("FFmpegSource: Selected track is not %s", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
return Index;
}
bool FFmpegAudioSource::LoadSampleInfoFromFile(const char *AAudioCacheFile, const char *ADemuxedAudioFile, const char *ASource, int AAudioTrack) {
if (!FFAudioBase::LoadSampleInfoFromFile(AAudioCacheFile, ASource, AAudioTrack))
return false;
char DefaultCacheFilename[1024];
sprintf(DefaultCacheFilename, "%s.ffasd%dcache", ASource, AAudioTrack);
if (!strcmp(ADemuxedAudioFile, ""))
ADemuxedAudioFile = DefaultCacheFilename;
RawCache = fopen(ADemuxedAudioFile, "rb");
if (!RawCache)
return false;
return true;
}
FFmpegAudioSource::FFmpegAudioSource(const char *ASource, int AAudioTrack, const char *AAudioCache, const char *ADemuxedAudioFile, IScriptEnvironment *Env) {
BufferSize = 0;
Buffer = NULL;
RawCache = NULL;
FormatContext = NULL;
AudioCodecContext = NULL;
AVCodec *AudioCodec = NULL;
if (av_open_input_file(&FormatContext, ASource, NULL, 0, NULL) != 0)
Env->ThrowError("FFmpegSource: Couldn't open '%s'", ASource);
if (av_find_stream_info(FormatContext) < 0)
Env->ThrowError("FFmpegSource: Couldn't find stream information");
AudioTrack = GetTrackIndex(AAudioTrack, CODEC_TYPE_AUDIO, Env);
AudioCodecContext = FormatContext->streams[AudioTrack]->codec;
AudioCodec = avcodec_find_decoder(AudioCodecContext->codec_id);
if (AudioCodec == NULL)
Env->ThrowError("FFmpegSource: Audio codec not found");
if (avcodec_open(AudioCodecContext, AudioCodec) < 0)
Env->ThrowError("FFmpegSource: Could not open audio codec");
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 cache
bool ACacheIsValid = LoadSampleInfoFromFile(AAudioCache, ADemuxedAudioFile, ASource, AudioTrack);
char DefaultCacheFilename[1024];
sprintf(DefaultCacheFilename, "%s.ffasd%dcache", ASource, AudioTrack);
if (!strcmp(ADemuxedAudioFile, ""))
ADemuxedAudioFile = DefaultCacheFilename;
if (!RawCache)
RawCache = fopen(ADemuxedAudioFile, "wb+");
// Needs to be indexed?
if (!ACacheIsValid) {
AVPacket Packet;
while (av_read_frame(FormatContext, &Packet) >= 0) {
if (Packet.stream_index == AudioTrack) {
SI.push_back(SampleInfo(VI.num_audio_samples, _ftelli64(RawCache), Packet.size, (Packet.flags & PKT_FLAG_KEY) ? 1 : 0));
fwrite(Packet.data, 1, Packet.size, RawCache);
if (AudioCodecContext->frame_size > 0) {
VI.num_audio_samples += AudioCodecContext->frame_size;
} else {
int Size = Packet.size;
uint8_t *Data = Packet.data;
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;
}
}
}
}
av_free_packet(&Packet);
}
av_seek_frame(FormatContext, AudioTrack, 0, AVSEEK_FLAG_BACKWARD);
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");
}
int FFmpegAudioSource::DecodeNextAudioBlock(uint8_t *ABuf, int64_t *ACount, uint64_t AFilePos, unsigned int AFrameSize, IScriptEnvironment *Env) {
int Ret = -1;
*ACount = 0;
_fseeki64(RawCache, AFilePos, SEEK_SET);
if (AFrameSize > BufferSize) {
Buffer = (uint8_t *)realloc(Buffer, AFrameSize);
BufferSize = AFrameSize;
}
fread(Buffer, 1, AFrameSize, RawCache);
uint8_t *Data = Buffer;
int Size = AFrameSize;
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;
}
void FFmpegAudioSource::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 && DecodeCount > 0);
}
FFmpegAudioSource::~FFmpegAudioSource() {
if (RawCache)
fclose(RawCache);
if (AudioCodecContext)
avcodec_close(AudioCodecContext);
av_close_input_file(FormatContext);
}