mirror of https://github.com/bsnes-emu/bsnes.git
88 lines
2.1 KiB
C++
88 lines
2.1 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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setReverbDelay(reverbDelay);
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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::setReverbDelay(uint reverbDelay) -> void {
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this->reverbDelay = reverbDelay;
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reverbLeft.resize(frequency * reverbDelay / 1000.0);
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reverbRight.resize(frequency * reverbDelay / 1000.0);
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memory::fill(reverbLeft.data(), reverbLeft.size() * sizeof(int16));
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memory::fill(reverbRight.data(), reverbRight.size() * sizeof(int16));
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}
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auto Audio::setReverbLevel(double reverbLevel) -> void {
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this->reverbLevel = reverbLevel;
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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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ileft *= volume;
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iright *= volume;
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if(reverbDelay) {
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reverbLeft.append(ileft);
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reverbRight.append(iright);
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ileft += reverbLeft.takeLeft() * reverbLevel;
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iright += reverbRight.takeLeft() * reverbLevel;
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}
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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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