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/* Copyright (C) 2015-2017 Sergey V. Mikayev
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "SoxrAdapter.h"
#include "../Synth.h"
using namespace MT32Emu;
static const unsigned int CHANNEL_COUNT = 2;
size_t SoxrAdapter::getInputSamples(void *input_fn_state, soxr_in_t *data, size_t requested_len) {
unsigned int length = requested_len < 1 ? 1 : (MAX_SAMPLES_PER_RUN < requested_len ? MAX_SAMPLES_PER_RUN : static_cast<unsigned int>(requested_len));
SoxrAdapter *instance = static_cast<SoxrAdapter *>(input_fn_state);
instance->synth.render(instance->inBuffer, length);
*data = instance->inBuffer;
return length;
}
SoxrAdapter::SoxrAdapter(Synth &useSynth, double targetSampleRate, SamplerateConversionQuality quality) :
synth(useSynth),
inBuffer(new float[CHANNEL_COUNT * MAX_SAMPLES_PER_RUN])
{
soxr_io_spec_t ioSpec = soxr_io_spec(SOXR_FLOAT32_I, SOXR_FLOAT32_I);
unsigned long qualityRecipe;
switch (quality) {
case SamplerateConversionQuality_FASTEST:
qualityRecipe = SOXR_QQ;
break;
case SamplerateConversionQuality_FAST:
qualityRecipe = SOXR_LQ;
break;
case SamplerateConversionQuality_GOOD:
qualityRecipe = SOXR_MQ;
break;
case SamplerateConversionQuality_BEST:
default:
qualityRecipe = SOXR_16_BITQ;
break;
};
soxr_quality_spec_t qSpec = soxr_quality_spec(qualityRecipe, 0);
soxr_runtime_spec_t rtSpec = soxr_runtime_spec(1);
soxr_error_t error;
resampler = soxr_create(synth.getStereoOutputSampleRate(), targetSampleRate, CHANNEL_COUNT, &error, &ioSpec, &qSpec, &rtSpec);
if (error != NULL) {
synth.printDebug("SoxrAdapter: Creation of SOXR instance failed: %s\n", soxr_strerror(error));
soxr_delete(resampler);
resampler = NULL;
return;
}
error = soxr_set_input_fn(resampler, getInputSamples, this, MAX_SAMPLES_PER_RUN);
if (error != NULL) {
synth.printDebug("SoxrAdapter: Installing sample feed for SOXR failed: %s\n", soxr_strerror(error));
soxr_delete(resampler);
resampler = NULL;
}
}
SoxrAdapter::~SoxrAdapter() {
delete[] inBuffer;
if (resampler != NULL) {
soxr_delete(resampler);
}
}
void SoxrAdapter::getOutputSamples(float *buffer, unsigned int length) {
if (resampler == NULL) {
Synth::muteSampleBuffer(buffer, CHANNEL_COUNT * length);
return;
}
while (length > 0) {
size_t gotFrames = soxr_output(resampler, buffer, size_t(length));
soxr_error_t error = soxr_error(resampler);
if (error != NULL) {
synth.printDebug("SoxrAdapter: SOXR error during processing: %s > resetting\n", soxr_strerror(error));
error = soxr_clear(resampler);
if (error != NULL) {
synth.printDebug("SoxrAdapter: SOXR failed to reset: %s\n", soxr_strerror(error));
soxr_delete(resampler);
resampler = NULL;
Synth::muteSampleBuffer(buffer, CHANNEL_COUNT * length);
synth.printDebug("SoxrAdapter: SOXR disabled\n");
return;
}
continue;
}
if (gotFrames == 0) {
synth.printDebug("SoxrAdapter: got 0 frames from SOXR, weird\n");
}
buffer += CHANNEL_COUNT * gotFrames;
length -= static_cast<unsigned int>(gotFrames);
}
}
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