Aegisub/aegisub/audio_provider_lavc.cpp
Niels Martin Hansen c6722b0587 Fixed some building on Linux, at least on Ubuntu Feisty amd64. Also
updated configure.ac to check for wxSTC instead of wxScintilla.

Originally committed to SVN as r1106.
2007-04-22 00:23:21 +00:00

224 lines
6.2 KiB
C++

// 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
#ifdef WIN32
#define EMULATE_INTTYPES
#endif
#include <wx/wxprec.h>
/* avcodec.h uses INT64_C in a *single* place. This prolly breaks on Win32,
* but, well. Let's at least fix it for Linux.
*
#define __STDC_CONSTANT_MACROS 1
#include <stdint.h>
* - done in posix/defines.h
*/
#include <ffmpeg/avcodec.h>
#include <ffmpeg/avformat.h>
#include "mkv_wrap.h"
#include "lavc_file.h"
#include "audio_provider.h"
#include "lavc_file.h"
#include "utils.h"
#include "options.h"
///////////////////////
// LAVC Audio Provider
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);
virtual ~LAVCAudioProvider();
virtual void GetAudio(void *buf, __int64 start, __int64 count);
};
///////////
// Factory
class LAVCAudioProviderFactory : public AudioProviderFactory {
public:
AudioProvider *CreateProvider(wxString file) { return new LAVCAudioProvider(file); }
LAVCAudioProviderFactory() : AudioProviderFactory(_T("lavc")) {}
} registerLAVCaudio;
///////////////
// Constructor
LAVCAudioProvider::LAVCAudioProvider(wxString _filename)
: lavcfile(NULL), codecContext(NULL), rsct(NULL), buffer(NULL)
{
try {
#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) {
codecContext = NULL;
throw _T("Could not find an audio stream");
}
AVCodec *codec = avcodec_find_decoder(codecContext->codec_id);
if (!codec) {
codecContext = NULL;
throw _T("Could not find a suitable audio decoder");
}
if (avcodec_open(codecContext, codec) < 0)
throw _T("Failed to open audio decoder");
/* aegisub currently supports mono only, so always resample */
sample_rate = Options.AsInt(_T("Audio Sample Rate"));
if (!sample_rate)
sample_rate = codecContext->sample_rate;
channels = 1;
bytes_per_sample = 2;
rsct = audio_resample_init(1, codecContext->channels, sample_rate, codecContext->sample_rate);
if (!rsct)
throw _T("Failed to initialize resampling");
resample_ratio = (float)sample_rate / (float)codecContext->sample_rate;
double length = (double)stream->duration * av_q2d(stream->time_base);
num_samples = (__int64)(length * sample_rate);
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) {
while (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");
if (bytesout == 0)
break;
samples = bytesout >> 1;
if (rsct) {
if ((__int64)(samples * resample_ratio / codecContext->channels) > _count)
samples = (__int64)(_count / resample_ratio * codecContext->channels);
samples = audio_resample(rsct, _buf, buffer, samples / codecContext->channels);
assert(samples <= _count);
} else {
/* currently dead code, rsct != NULL because we're resampling for mono */
if (samples > _count)
samples = _count;
memcpy(_buf, buffer, samples << 1);
}
_buf += samples;
_count -= samples;
break;
}
av_free_packet(&packet);
}
}