24f966481f
According to documentation, if the argument of std::exp is zero, one is returned. However we want the return value to be also zero in this case so no audio is played.
90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
// Copyright 2017 Citra Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <cstddef>
|
|
#include "audio_core/dsp_interface.h"
|
|
#include "audio_core/sink.h"
|
|
#include "audio_core/sink_details.h"
|
|
#include "common/assert.h"
|
|
#include "core/settings.h"
|
|
|
|
namespace AudioCore {
|
|
|
|
DspInterface::DspInterface() = default;
|
|
DspInterface::~DspInterface() = default;
|
|
|
|
void DspInterface::SetSink(const std::string& sink_id, const std::string& audio_device) {
|
|
sink = CreateSinkFromID(Settings::values.sink_id, Settings::values.audio_device_id);
|
|
sink->SetCallback(
|
|
[this](s16* buffer, std::size_t num_frames) { OutputCallback(buffer, num_frames); });
|
|
time_stretcher.SetOutputSampleRate(sink->GetNativeSampleRate());
|
|
}
|
|
|
|
Sink& DspInterface::GetSink() {
|
|
ASSERT(sink);
|
|
return *sink.get();
|
|
}
|
|
|
|
void DspInterface::EnableStretching(bool enable) {
|
|
if (perform_time_stretching == enable)
|
|
return;
|
|
|
|
if (!enable) {
|
|
flushing_time_stretcher = true;
|
|
}
|
|
perform_time_stretching = enable;
|
|
}
|
|
|
|
void DspInterface::OutputFrame(StereoFrame16& frame) {
|
|
if (!sink)
|
|
return;
|
|
|
|
fifo.Push(frame.data(), frame.size());
|
|
}
|
|
|
|
void DspInterface::OutputSample(std::array<s16, 2> sample) {
|
|
if (!sink)
|
|
return;
|
|
|
|
fifo.Push(&sample, 1);
|
|
}
|
|
|
|
void DspInterface::OutputCallback(s16* buffer, std::size_t num_frames) {
|
|
std::size_t frames_written;
|
|
if (perform_time_stretching) {
|
|
const std::vector<s16> in{fifo.Pop()};
|
|
const std::size_t num_in{in.size() / 2};
|
|
frames_written = time_stretcher.Process(in.data(), num_in, buffer, num_frames);
|
|
} else if (flushing_time_stretcher) {
|
|
time_stretcher.Flush();
|
|
frames_written = time_stretcher.Process(nullptr, 0, buffer, num_frames);
|
|
frames_written += fifo.Pop(buffer, num_frames - frames_written);
|
|
flushing_time_stretcher = false;
|
|
} else {
|
|
frames_written = fifo.Pop(buffer, num_frames);
|
|
}
|
|
|
|
if (frames_written > 0) {
|
|
std::memcpy(&last_frame[0], buffer + 2 * (frames_written - 1), 2 * sizeof(s16));
|
|
}
|
|
|
|
// Hold last emitted frame; this prevents popping.
|
|
for (std::size_t i = frames_written; i < num_frames; i++) {
|
|
std::memcpy(buffer + 2 * i, &last_frame[0], 2 * sizeof(s16));
|
|
}
|
|
|
|
// Implementation of the hardware volume slider with a dynamic range of 60 dB
|
|
const float linear_volume = std::clamp(Settings::values.volume, 0.0f, 1.0f);
|
|
if (linear_volume != 1.0) {
|
|
const float volume_scale_factor =
|
|
linear_volume == 0 ? 0 : std::exp(6.90775f * linear_volume) * 0.001f;
|
|
for (std::size_t i = 0; i < num_frames; i++) {
|
|
buffer[i * 2 + 0] = static_cast<s16>(buffer[i * 2 + 0] * volume_scale_factor);
|
|
buffer[i * 2 + 1] = static_cast<s16>(buffer[i * 2 + 1] * volume_scale_factor);
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace AudioCore
|