//TODO Add ifdef for int16 or float32 type
void SamplerateConverter::resample (SFLDataFormat* dataIn , SFLDataFormat* dataOut , int inputFreq , int outputFreq , int nbSamples)
{
double sampleFactor = (double) outputFreq / inputFreq;
if (sampleFactor == 1.0)
return;
unsigned int outSamples = nbSamples * sampleFactor;
unsigned int maxSamples = outSamples;
if (maxSamples < (unsigned int)nbSamples)
maxSamples = nbSamples;
if (maxSamples > _samples) {
/* grow buffer if needed */
_samples = maxSamples;
delete [] _floatBufferIn;
delete [] _floatBufferOut;
_floatBufferIn = new float32[_samples];
_floatBufferOut = new float32[_samples];
}
SRC_DATA src_data;
src_data.data_in = _floatBufferIn;
src_data.data_out = _floatBufferOut;
src_data.input_frames = nbSamples;
src_data.output_frames = outSamples;
src_data.src_ratio = sampleFactor;
src_data.end_of_input = 0; // More data will come
Short2FloatArray (dataIn , _floatBufferIn, nbSamples);
src_process (_src_state, &src_data);
src_float_to_short_array (_floatBufferOut, dataOut , outSamples);
}
void SamplerateConverter::resample(SFLDataFormat *dataIn,
SFLDataFormat *dataOut,
size_t dataOutSize, int inputFreq,
int outputFreq, size_t nbSamples)
{
double sampleFactor = (double) outputFreq / inputFreq;
if (sampleFactor == 1.0)
return;
size_t outSamples = nbSamples * sampleFactor;
const unsigned int maxSamples = std::max(outSamples, nbSamples);
if (maxSamples > samples_) {
/* grow buffer if needed */
samples_ = maxSamples;
delete [] floatBufferIn_;
delete [] floatBufferOut_;
floatBufferIn_ = new float[samples_];
floatBufferOut_ = new float[samples_];
}
SRC_DATA src_data;
src_data.data_in = floatBufferIn_;
src_data.data_out = floatBufferOut_;
src_data.input_frames = nbSamples;
src_data.output_frames = outSamples;
src_data.src_ratio = sampleFactor;
src_data.end_of_input = 0; // More data will come
Short2FloatArray(dataIn, floatBufferIn_, nbSamples);
src_process(src_state_, &src_data);
if (outSamples > dataOutSize) {
ERROR("Outsamples exceeds output buffer size, clamping to %u", dataOutSize);
outSamples = dataOutSize;
}
src_float_to_short_array(floatBufferOut_, dataOut, outSamples);
}
