mirror of https://github.com/bsnes-emu/bsnes.git
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
#ifdef SYSTEM_CPP
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Audio audio;
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void Audio::coprocessor_enable(bool state) {
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coprocessor = state;
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dspaudio.clear();
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dsp_rdoffset = cop_rdoffset = 0;
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dsp_wroffset = cop_wroffset = 0;
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dsp_length = cop_length = 0;
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}
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void Audio::coprocessor_frequency(double input_frequency) {
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dspaudio.setFrequency(input_frequency);
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dspaudio.setResampler(nall::DSP::ResampleEngine::Sinc);
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dspaudio.setResamplerFrequency(system.apu_frequency() / 768.0);
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}
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void Audio::sample(int16 lsample, int16 rsample) {
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if(coprocessor == false) return interface->audioSample(lsample, rsample);
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dsp_buffer[dsp_wroffset] = ((uint16)lsample << 0) + ((uint16)rsample << 16);
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dsp_wroffset = (dsp_wroffset + 1) & buffer_mask;
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dsp_length = (dsp_length + 1) & buffer_mask;
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flush();
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}
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void Audio::coprocessor_sample(int16 lsample, int16 rsample) {
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signed samples[] = {lsample, rsample};
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dspaudio.sample(samples);
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while(dspaudio.pending()) {
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dspaudio.read(samples);
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cop_buffer[cop_wroffset] = ((uint16)samples[0] << 0) + ((uint16)samples[1] << 16);
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cop_wroffset = (cop_wroffset + 1) & buffer_mask;
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cop_length = (cop_length + 1) & buffer_mask;
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flush();
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}
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}
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void Audio::init() {
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}
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void Audio::flush() {
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while(dsp_length > 0 && cop_length > 0) {
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uint32 dsp_sample = dsp_buffer[dsp_rdoffset];
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uint32 cop_sample = cop_buffer[cop_rdoffset];
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dsp_rdoffset = (dsp_rdoffset + 1) & buffer_mask;
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cop_rdoffset = (cop_rdoffset + 1) & buffer_mask;
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dsp_length--;
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cop_length--;
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signed dsp_left = (int16)(dsp_sample >> 0);
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signed dsp_right = (int16)(dsp_sample >> 16);
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signed cop_left = (int16)(cop_sample >> 0);
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signed cop_right = (int16)(cop_sample >> 16);
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interface->audioSample(
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sclamp<16>(dsp_left + cop_left ),
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sclamp<16>(dsp_right + cop_right)
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);
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}
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}
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#endif
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