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/* UltraStar Deluxe - Karaoke Game
*
* UltraStar Deluxe is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*/
#ifndef _FFMPEG_AUDIO_CONVERT_H_
#define _FFMPEG_AUDIO_CONVERT_H_
#include "ffmpeg_core.h"
#include "core/plugin_audio_convert.h"
#include <math.h>
extern const audioConverterInfo_t audioConverterInfo;
// Note: FFmpeg seems to be using "kaiser windowed sinc" for resampling, so
// the quality should be good.
class FFmpegAudioConvertStream : public AudioConvertStream {
private:
ReSampleContext *_resampleContext;
double _ratio;
protected:
FFmpegAudioConvertStream(const AudioFormatInfo &srcFormatInfo, const AudioFormatInfo &dstFormatInfo) :
AudioConvertStream(srcFormatInfo, dstFormatInfo),
_resampleContext(NULL),
_ratio(0) {}
bool init() {
// Note: FFmpeg does not support resampling for more than 2 input channels
if (_srcFormatInfo.getFormat() != AUDIO_SAMPLE_FORMAT_S16) {
logger.error("Unsupported format", "TAudioConverter_FFmpeg.Init");
return false;
}
if (_srcFormatInfo.getFormat() != _dstFormatInfo.getFormat()) {
logger.error("Incompatible formats", "TAudioConverter_FFmpeg.Init");
return false;
}
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52,15,0)
// use same values as the deprecated audio_resample_init()
const int TAPS = 16;
_resampleContext = av_audio_resample_init(
_dstFormatInfo.getChannels(),
_srcFormatInfo.getChannels(),
lround(_dstFormatInfo.getSampleRate()),
lround(_srcFormatInfo.getSampleRate()),
SAMPLE_FMT_S16, SAMPLE_FMT_S16,
TAPS, 10, 0, 0.8);
#else
_resampleContext = audio_resample_init(
_dstFormatInfo.getChannels(),
_srcFormatInfo.getChannels(),
lround(_dstFormatInfo.getSampleRate()),
lround(_srcFormatInfo.getSampleRate()));
#endif
if (!_resampleContext) {
logger.error("audio_resample_init() failed", "TAudioConverter_FFmpeg.Init");
return false;
}
// calculate ratio
_ratio = ((double)_dstFormatInfo.getChannels() / _srcFormatInfo.getChannels()) *
(_dstFormatInfo.getSampleRate() / _srcFormatInfo.getSampleRate());
return true;
}
public:
virtual ~FFmpegAudioConvertStream() {
if (_resampleContext)
audio_resample_close(_resampleContext);
}
static FFmpegAudioConvertStream* open(const AudioFormatInfo &srcFormatInfo, const AudioFormatInfo &dstFormatInfo) {
FFmpegAudioConvertStream *converter = new FFmpegAudioConvertStream(srcFormatInfo, dstFormatInfo);
if (!converter->init()) {
delete converter;
return 0;
}
return converter;
}
virtual int convert(uint8_t *inputBuffer, uint8_t *outputBuffer, int &inputSize) {
if (inputSize <= 0) {
// avoid div-by-zero in audio_resample()
return (inputSize == 0) ? 0 : -1;
}
int inputSampleCount = inputSize / _srcFormatInfo.getFrameSize();
int outputSampleCount = audio_resample(_resampleContext,
(short*)outputBuffer, (short*)inputBuffer, inputSampleCount);
if (outputSampleCount == -1) {
logger.error("audio_resample() failed", "TAudioConverter_FFmpeg.Convert");
return -1;
}
return outputSampleCount * _dstFormatInfo.getFrameSize();
}
/**
* Destination/Source size ratio
*/
virtual double getRatio() {
return _ratio;
}
virtual int getOutputBufferSize(int inputSize) {
return ceil(inputSize * getRatio());
}
};
#endif /* _FFMPEG_AUDIO_CONVERT_H_ */
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