mirror of https://github.com/bsnes-emu/bsnes.git
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
auto Stream::reset(uint channels_, double inputFrequency, double outputFrequency) -> void {
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this->inputFrequency = inputFrequency;
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this->outputFrequency = outputFrequency;
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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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channel.filters.reset();
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channel.resampler.reset(inputFrequency, outputFrequency);
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}
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}
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auto Stream::setFrequency(double inputFrequency, maybe<double> outputFrequency) -> void {
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this->inputFrequency = inputFrequency;
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if(outputFrequency) this->outputFrequency = outputFrequency();
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for(auto& channel : channels) {
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channel.resampler.reset(this->inputFrequency, this->outputFrequency);
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}
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}
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auto Stream::addFilter(Filter::Order order, Filter::Type type, double cutoffFrequency, uint passes) -> void {
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for(auto& channel : channels) {
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for(auto pass : range(passes)) {
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Filter filter{order};
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if(order == Filter::Order::First) {
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DSP::IIR::OnePole::Type _type;
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if(type == Filter::Type::LowPass) _type = DSP::IIR::OnePole::Type::LowPass;
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if(type == Filter::Type::HighPass) _type = DSP::IIR::OnePole::Type::HighPass;
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filter.onePole.reset(_type, cutoffFrequency, inputFrequency);
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}
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if(order == Filter::Order::Second) {
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DSP::IIR::Biquad::Type _type;
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if(type == Filter::Type::LowPass) _type = DSP::IIR::Biquad::Type::LowPass;
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if(type == Filter::Type::HighPass) _type = DSP::IIR::Biquad::Type::HighPass;
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double q = DSP::IIR::Biquad::butterworth(passes * 2, pass);
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filter.biquad.reset(_type, cutoffFrequency, inputFrequency, q);
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}
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channel.filters.append(filter);
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}
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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& filter : channels[c].filters) {
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switch(filter.order) {
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case Filter::Order::First: sample = filter.onePole.process(sample); break;
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case Filter::Order::Second: sample = filter.biquad.process(sample); break;
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}
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}
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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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