mirror of https://github.com/bsnes-emu/bsnes.git
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
auto Stream::reset(uint channels_, double inputFrequency, double outputFrequency) -> void {
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channels.reset();
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channels.resize(channels_);
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for(auto& channel : channels) {
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if(outputFrequency / inputFrequency <= 0.5) {
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channel.iir.resize(order / 2);
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for(auto phase : range(order / 2)) {
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double q = DSP::IIR::Biquad::butterworth(order, phase);
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channel.iir[phase].reset(DSP::IIR::Biquad::Type::LowPass, 20000.0 / inputFrequency, q);
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}
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}
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channel.resampler.reset(inputFrequency, outputFrequency);
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}
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}
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auto Stream::pending() const -> bool {
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return channels && channels[0].resampler.pending();
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}
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auto Stream::read(double* samples) -> uint {
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for(auto c : range(channels)) samples[c] = channels[c].resampler.read();
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return channels.size();
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}
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auto Stream::write(const double* samples) -> void {
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for(auto c : range(channels)) {
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double sample = samples[c] + 1e-25; //constant offset used to suppress denormals
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for(auto& iir : channels[c].iir) sample = iir.process(sample);
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channels[c].resampler.write(sample);
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}
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audio.process();
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}
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