mirror of https://github.com/bsnes-emu/bsnes.git
86 lines
2.0 KiB
C++
Executable File
86 lines
2.0 KiB
C++
Executable File
#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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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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r_sum_l = r_sum_r = 0;
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}
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void Audio::coprocessor_frequency(double input_frequency) {
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double output_frequency;
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output_frequency = system.apu_frequency() / 768.0;
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r_step = input_frequency / output_frequency;
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r_frac = 0;
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}
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void Audio::sample(int16 left, int16 right) {
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if(coprocessor == false) {
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system.interface->audio_sample(left, right);
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} else {
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dsp_buffer[dsp_wroffset] = ((uint16)left << 0) + ((uint16)right << 16);
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dsp_wroffset = (dsp_wroffset + 1) & 32767;
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dsp_length = (dsp_length + 1) & 32767;
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flush();
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}
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}
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void Audio::coprocessor_sample(int16 left, int16 right) {
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if(r_frac >= 1.0) {
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r_frac -= 1.0;
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r_sum_l += left;
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r_sum_r += right;
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return;
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}
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r_sum_l += left * r_frac;
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r_sum_r += right * r_frac;
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uint16 output_left = sclamp<16>(int(r_sum_l / r_step));
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uint16 output_right = sclamp<16>(int(r_sum_r / r_step));
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double first = 1.0 - r_frac;
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r_sum_l = left * first;
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r_sum_r = right * first;
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r_frac = r_step - first;
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cop_buffer[cop_wroffset] = (output_left << 0) + (output_right << 16);
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cop_wroffset = (cop_wroffset + 1) & 32767;
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cop_length = (cop_length + 1) & 32767;
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flush();
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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) & 32767;
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cop_rdoffset = (cop_rdoffset + 1) & 32767;
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dsp_length--;
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cop_length--;
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int dsp_left = (int16)(dsp_sample >> 0);
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int dsp_right = (int16)(dsp_sample >> 16);
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int cop_left = (int16)(cop_sample >> 0);
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int cop_right = (int16)(cop_sample >> 16);
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system.interface->audio_sample(
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sclamp<16>((dsp_left + cop_left ) / 2),
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sclamp<16>((dsp_right + cop_right) / 2)
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);
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}
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}
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#endif
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