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84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cstddef>
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#include "audio_core/dsp_interface.h"
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#include "audio_core/sink.h"
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#include "audio_core/sink_details.h"
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#include "common/assert.h"
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#include "core/settings.h"
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namespace AudioCore {
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DspInterface::DspInterface() = default;
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DspInterface::~DspInterface() {
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if (perform_time_stretching) {
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FlushResidualStretcherAudio();
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}
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}
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void DspInterface::SetSink(const std::string& sink_id, const std::string& audio_device) {
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const SinkDetails& sink_details = GetSinkDetails(sink_id);
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sink = sink_details.factory(audio_device);
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time_stretcher.SetOutputSampleRate(sink->GetNativeSampleRate());
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}
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Sink& DspInterface::GetSink() {
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ASSERT(sink);
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return *sink.get();
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}
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void DspInterface::EnableStretching(bool enable) {
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if (perform_time_stretching == enable)
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return;
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if (!enable) {
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FlushResidualStretcherAudio();
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}
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perform_time_stretching = enable;
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}
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void DspInterface::OutputFrame(StereoFrame16& frame) {
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if (!sink)
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return;
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// Implementation of the hardware volume slider with a dynamic range of 60 dB
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float volume_scale_factor = std::exp(6.90775 * Settings::values.volume) * 0.001;
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for (size_t i = 0; i < frame.size(); i++) {
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frame[i][0] = static_cast<s16>(frame[i][0] * volume_scale_factor);
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frame[i][1] = static_cast<s16>(frame[i][1] * volume_scale_factor);
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}
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if (perform_time_stretching) {
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time_stretcher.AddSamples(&frame[0][0], frame.size());
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std::vector<s16> stretched_samples = time_stretcher.Process(sink->SamplesInQueue());
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sink->EnqueueSamples(stretched_samples.data(), stretched_samples.size() / 2);
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} else {
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constexpr size_t maximum_sample_latency = 2048; // about 64 miliseconds
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if (sink->SamplesInQueue() > maximum_sample_latency) {
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// This can occur if we're running too fast and samples are starting to back up.
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// Just drop the samples.
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return;
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}
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sink->EnqueueSamples(&frame[0][0], frame.size());
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}
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}
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void DspInterface::FlushResidualStretcherAudio() {
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if (!sink)
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return;
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time_stretcher.Flush();
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while (true) {
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std::vector<s16> residual_audio = time_stretcher.Process(sink->SamplesInQueue());
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if (residual_audio.empty())
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break;
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sink->EnqueueSamples(residual_audio.data(), residual_audio.size() / 2);
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}
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}
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} // namespace AudioCore
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