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Code Issues Releases Wiki Activity

LAVCAudioProvider 

Originally committed to SVN as r328.
This commit is contained in:
David Lamparter 2006-04-14 22:37:05 +00:00
parent 1519ee5ce6
commit d12496a442
5 changed files with 227 additions and 1 deletions
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1
core/Makefile.am
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@ -26,6 +26,7 @@ aegisub_SOURCES = about.cpp \
audio_player_portaudio.cpp \
audio_provider.cpp \
audio_provider_hd.cpp \
audio_provider_lavc.cpp \
audio_provider_ram.cpp \
automation.cpp \
automation_filter.cpp \

2
core/audio_provider.cpp
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@ -168,7 +168,7 @@ AudioProvider *AudioProvider::GetAudioProvider(wxString filename, AudioDisplay *
// Select provider
#ifdef USE_LAVC
if (!provider) provider = new LAVCAudioProvider(filename);
if (!provider) provider = new LAVCAudioProvider(filename, vprovider);
#endif
#ifdef __WINDOWS__

157
core/audio_provider_lavc.cpp Normal file
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@ -0,0 +1,157 @@
// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
///////////
// Headers
#include <wx/wxprec.h>
#ifdef USE_LAVC
#include "utils.h"
#include "audio_provider_lavc.h"
#include "video_provider_lavc.h"
#include "options.h"
LAVCAudioProvider::LAVCAudioProvider(wxString _filename, VideoProvider *vpro)
try
: lavcfile(NULL), codecContext(NULL), rsct(NULL), buffer(NULL)
{
#if 0
/* since seeking currently is likely to be horribly broken with two
* providers accessing the same stream, this is disabled for now.
*/
LAVCVideoProvider *vpro_lavc = dynamic_cast<LAVCVideoProvider *>(vpro);
if (vpro_lavc) {
lavcfile = vpro->lavcfile->AddRef();
filename = vpro_lavc->GetFilename();
} else {
#endif
lavcfile = LAVCFile::Create(_filename);
filename = _filename;
#if 0
}
#endif
audStream = -1;
for (int i = 0; i < lavcfile->fctx->nb_streams; i++) {
codecContext = lavcfile->fctx->streams[i]->codec;
if (codecContext->codec_type == CODEC_TYPE_AUDIO) {
stream = lavcfile->fctx->streams[i];
audStream = i;
break;
}
}
if (audStream == -1)
throw _T("Could not find an audio stream");
AVCodec *codec = avcodec_find_decoder(codecContext->codec_id);
if (!codec)
throw _T("Could not find a suitable audio decoder");
if (avcodec_open(codecContext, codec) < 0)
throw _T("Failed to open audio decoder");
int setsample = Options.AsInt(_T("Audio Sample Rate"));
num_samples = stream->duration / bytes_per_sample;
if (setsample) {
rsct = audio_resample_init(1, codecContext->channels, setsample, codecContext->sample_rate);
sample_rate = setsample;
channels = 1;
resample_ratio = (float)setsample / (float)codecContext->sample_rate;
num_samples = (__int64)(num_samples * resample_ratio);
} else {
sample_rate = codecContext->sample_rate;
channels = codecContext->channels;
}
bytes_per_sample = 2;
buffer = (int16_t *)malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
if (!buffer)
throw _T("Out of memory");
} catch (...) {
Destroy();
throw;
}
LAVCAudioProvider::~LAVCAudioProvider()
{
Destroy();
}
void LAVCAudioProvider::Destroy()
{
if (buffer)
free(buffer);
if (rsct)
audio_resample_close(rsct);
if (codecContext)
avcodec_close(codecContext);
if (lavcfile)
lavcfile->Release();
}
void LAVCAudioProvider::GetAudio(void *buf, __int64 start, __int64 count)
{
int16_t *_buf = (int16_t *)buf;
__int64 _count = num_samples - start;
if (count < _count)
_count = count;
if (_count < 0)
_count = 0;
memset(_buf + _count, 0, (count - _count) << 1);
AVPacket packet;
while (_count > 0 && av_read_frame(lavcfile->fctx, &packet) >= 0) {
if(packet.stream_index == audStream) {
int bytesout = 0, samples;
if (avcodec_decode_audio(codecContext, buffer, &bytesout, packet.data, packet.size) < 0)
throw _T("Failed to decode audio");
samples = bytesout >> 1;
if (rsct) {
if ((__int64)(samples * resample_ratio) > _count)
samples = (__int64)(_count * resample_ratio);
samples = audio_resample(rsct, _buf, buffer, samples);
assert(samples <= _count);
} else
memcpy(_buf, buffer, samples << 1);
_buf += samples;
_count -= samples;
}
av_free_packet(&packet);
}
}
#endif

67
core/audio_provider_lavc.h Normal file
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@ -0,0 +1,67 @@
// Copyright (c) 2005, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
#pragma once
#ifndef AUDIO_PROVIDER_LAVC_H
#define AUDIO_PROVIDER_LAVC_H
#include "audio_provider.h"
#include "lavc_file.h"
class LAVCAudioProvider : public AudioProvider {
private:
LAVCFile *lavcfile;
AVCodecContext *codecContext;
ReSampleContext *rsct;
float resample_ratio;
AVStream *stream;
int audStream;
int16_t *buffer;
void Destroy();
public:
LAVCAudioProvider(wxString _filename, VideoProvider *vpro);
virtual ~LAVCAudioProvider();
virtual void GetAudio(void *buf, __int64 start, __int64 count);
};
#endif /* AUDIO_PROVIDER_LAVC_H */

1
core/video_provider_lavc.h
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@ -59,6 +59,7 @@
///////////////////////
// LibAVCodec provider
class LAVCVideoProvider : public VideoProvider {
friend class LAVCAudioProvider;
private:
MatroskaWrapper mkv;