mirror of https://github.com/bsnes-emu/bsnes.git
96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
#include <emulator/emulator.hpp>
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namespace Emulator {
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#include "stream.cpp"
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Audio audio;
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auto Audio::reset() -> void {
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streams.reset();
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reverb.reset();
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reverb.resize(2);
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for(auto c : range(2)) {
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reverb[c].resize(7);
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reverb[c][0].resize(1229);
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reverb[c][1].resize(1559);
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reverb[c][2].resize(1907);
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reverb[c][3].resize(4057);
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reverb[c][4].resize(8117);
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reverb[c][5].resize(8311);
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reverb[c][6].resize(9931);
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}
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}
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auto Audio::setInterface(Interface* interface) -> void {
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this->interface = interface;
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}
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auto Audio::setFrequency(double frequency) -> void {
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this->frequency = frequency;
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for(auto& stream : streams) stream->setFrequency(frequency);
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}
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auto Audio::setVolume(double volume) -> void {
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this->volume = volume;
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}
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auto Audio::setBalance(double balance) -> void {
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this->balance = balance;
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}
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auto Audio::setReverb(bool enabled) -> void {
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this->reverbEnable = enabled;
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}
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auto Audio::createStream(uint channels, double frequency) -> shared_pointer<Stream> {
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shared_pointer<Stream> stream = new Stream{channels, frequency};
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stream->setFrequency(this->frequency);
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streams.append(stream);
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return stream;
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}
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//audio mixer
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auto Audio::poll() -> void {
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while(true) {
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for(auto& stream : streams) {
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if(!stream->pending()) return;
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}
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double left = 0.0, right = 0.0;
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for(auto& stream : streams) {
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double samples[2];
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stream->read(samples);
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left += samples[0];
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right += samples[1];
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}
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left /= streams.size();
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right /= streams.size();
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if(balance < 0.0) right *= 1.0 + balance;
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if(balance > 0.0) left *= 1.0 - balance;
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//todo: apply volume, reverb before denormalization?
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int ileft = (left * 65535.0) - 32768.0;
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int iright = (right * 65535.0) - 32768.0;
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if(reverbEnable) {
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ileft *= 0.125;
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for(auto n : range(7)) ileft += 0.125 * reverb[0][n].last();
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for(auto n : range(7)) reverb[0][n].write(ileft);
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ileft *= 8.000;
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iright *= 0.125;
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for(auto n : range(7)) iright += 0.125 * reverb[1][n].last();
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for(auto n : range(7)) reverb[1][n].write(iright);
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iright *= 8.000;
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}
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ileft *= volume;
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iright *= volume;
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interface->audioSample(sclamp<16>(ileft), sclamp<16>(iright));
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}
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}
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}
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