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Read and write stereo files

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coderkun 2017-03-19 17:52:47 +01:00 committed by Harry van Haaren
parent f36e9b6bd0
commit 6a6431242f
2 changed files with 49 additions and 36 deletions
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74
src/diskreader.cxx
View File

@ -164,48 +164,53 @@ int DiskReader::loadSample( int track, int scene, string path )
{
/// load the sample
SndfileHandle infile( path, SFM_READ );
std::vector<float> buf( infile.frames() * infile.channels() );
infile.read( (float*)&buf[0] , infile.frames() * infile.channels() );
int chnls = infile.channels();
std::vector<float> bufL( infile.frames() / chnls );
std::vector<float> bufR( infile.frames() / chnls );
std::vector<float> bufTmp( infile.frames() * (chnls-2) );
if ( infile.error() ) {
LUPPP_ERROR("File %s, Error %s", path.c_str(), infile.strError() );
return LUPPP_RETURN_ERROR;
}
LUPPP_NOTE("Loading file with %i chnls, frames %i,buffer size %i", infile.channels(), infile.frames(), buf.size() );
LUPPP_NOTE("Loading file with %i chnls, frames %i, bufferL size %i bufferR size %i", infile.channels(), infile.frames(), bufL.size(), bufR.size() );
/// kick stereo channel?
int chnls = infile.channels();
if ( chnls > 1 ) {
// we're gonna kick all samples that are *not* channel 1
std::vector<float> tmp( buf.size() / chnls );
// Read data
for(int f=0; f<infile.frames()/chnls; f++) {
infile.read( (float*)&bufL[f] , 1 );
infile.read( (float*)&bufR[f] , 1 );
LUPPP_NOTE("Non mono file: %i chnls found, old size %i, new size %i ", infile.channels(), buf.size(), tmp.size() );
for(size_t i = 0; i < tmp.size(); i++ ) {
tmp.at(i) = buf.at( i * chnls );
}
// swap the buffers
buf.swap( tmp );
}
// Read (and ignore) remaining channels
for(int c=0; c<chnls-2; c++) {
infile.read( (float*)&bufTmp[f], 1);
}
}
/// resample?
if ( infile.samplerate() != gui->samplerate ) {
LUPPP_NOTE("%s%i%s%i", "Resampling from ", infile.samplerate(), " to ", gui->samplerate);
float resampleRatio = float(gui->samplerate) / infile.samplerate();
std::vector<float> resampled( infile.frames() * resampleRatio );
std::vector<float> resampledL( infile.frames() / chnls * resampleRatio );
std::vector<float> resampledR( infile.frames() / chnls * resampleRatio );
SRC_DATA data;
data.data_in = &buf[0];
data.data_out = &resampled[0];
SRC_DATA dataL;
SRC_DATA dataR;
dataL.data_in = &bufL[0];
dataR.data_in = &bufR[0];
dataL.data_out = &resampledL[0];
dataR.data_out = &resampledR[0];
data.input_frames = infile.frames();
data.output_frames = infile.frames() * resampleRatio;
dataL.input_frames = infile.frames() / chnls;
dataR.input_frames = infile.frames() / chnls;
dataL.output_frames = infile.frames() / chnls * resampleRatio;
dataR.output_frames = infile.frames() / chnls * resampleRatio;
data.end_of_input = 0;
data.src_ratio = resampleRatio;
dataL.end_of_input = 0;
dataR.end_of_input = 0;
dataL.src_ratio = resampleRatio;
dataR.src_ratio = resampleRatio;
int q = SRC_SINC_FASTEST;
@ -223,22 +228,27 @@ int DiskReader::loadSample( int track, int scene, string path )
// resample quality taken from config file,
int ret = src_simple ( &data, q, 1 );
int ret = src_simple ( &dataL, q, 1 );
if ( ret == 0 )
LUPPP_NOTE("%s%i%s%i", "Resampling finished, from ", data.input_frames_used, " to ", data.output_frames_gen );
LUPPP_NOTE("%s%i%s%i", "Resampling L finished, from ", dataL.input_frames_used, " to ", dataL.output_frames_gen );
else
LUPPP_ERROR("%s%i%s%i", "Resampling finished, from ", data.input_frames_used, " to ", data.output_frames_gen );
LUPPP_ERROR("%s%i%s%i", "Resampling L finished, from ", dataL.input_frames_used, " to ", dataL.output_frames_gen );
ret = src_simple ( &dataR, q, 1 );
if ( ret == 0 )
LUPPP_NOTE("%s%i%s%i", "Resampling R finished, from ", dataR.input_frames_used, " to ", dataR.output_frames_gen );
else
LUPPP_ERROR("%s%i%s%i", "Resampling R finished, from ", dataR.input_frames_used, " to ", dataR.output_frames_gen );
/// exchange buffers, so buf contains the resampled audio
buf.swap( resampled );
bufL.swap( resampledL );
bufR.swap( resampledR );
}
/// create buffer, and set the data
AudioBuffer* ab = new AudioBuffer();
ab->setAudioFrames( buf.size() );
// TODO right (stereo)
ab->nonRtSetSample( buf, buf );
ab->setAudioFrames( bufL.size() );
ab->nonRtSetSample( bufL, bufR );
//cout << "DiskReader::loadSample() " << path << endl;

11
src/diskwriter.cxx
View File

@ -316,13 +316,16 @@ int DiskWriter::writeAudioBuffer(int track, int scene, AudioBuffer* ab,
}
SndfileHandle outfile( path.str(), SFM_WRITE, SF_FORMAT_WAV | SF_FORMAT_FLOAT, 1, gui->samplerate );
SndfileHandle outfile( path.str(), SFM_WRITE, SF_FORMAT_WAV | SF_FORMAT_FLOAT, 2, gui->samplerate );
// FIXME: the size of the buffer is bigger than the audio contained in it:
// calculate the length that needs saving using getBeats() * framesPerBeat
if ( ab->getAudioFrames() > 0 )
// TODO right (stereo)
outfile.write( &ab->getDataL()[0], ab->getAudioFrames() );
if ( ab->getAudioFrames() > 0 ) {
for(int i=0; i<ab->getAudioFrames(); i++) {
outfile.writef( &ab->getDataL()[i], 1); //sizeof(ab->getDataL()[i]));
outfile.writef( &ab->getDataR()[i], 1); //sizeof(ab->getDataR()[i]));
}
}
else {
LUPPP_WARN("%s","Sample has zero samples");
}