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// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include <memory>
#include "audio_core/hle/dsp.h"
#include "audio_core/hle/mixers.h"
#include "audio_core/hle/pipe.h"
#include "audio_core/hle/source.h"
#include "audio_core/sink.h"
#include "audio_core/time_stretch.h"
namespace DSP {
namespace HLE {
// Region management
std::array<SharedMemory, 2> g_regions;
static size_t CurrentRegionIndex() {
// The region with the higher frame counter is chosen unless there is wraparound.
// This function only returns a 0 or 1.
if (g_regions[0].frame_counter == 0xFFFFu && g_regions[1].frame_counter != 0xFFFEu) {
// Wraparound has occurred.
return 1;
}
if (g_regions[1].frame_counter == 0xFFFFu && g_regions[0].frame_counter != 0xFFFEu) {
// Wraparound has occurred.
return 0;
}
return (g_regions[0].frame_counter > g_regions[1].frame_counter) ? 0 : 1;
}
static SharedMemory& ReadRegion() {
return g_regions[CurrentRegionIndex()];
}
static SharedMemory& WriteRegion() {
return g_regions[1 - CurrentRegionIndex()];
}
// Audio processing and mixing
static std::array<Source, num_sources> sources = {
Source(0), Source(1), Source(2), Source(3), Source(4), Source(5), Source(6), Source(7),
Source(8), Source(9), Source(10), Source(11), Source(12), Source(13), Source(14), Source(15),
Source(16), Source(17), Source(18), Source(19), Source(20), Source(21), Source(22), Source(23),
};
static Mixers mixers;
static StereoFrame16 GenerateCurrentFrame() {
SharedMemory& read = ReadRegion();
SharedMemory& write = WriteRegion();
std::array<QuadFrame32, 3> intermediate_mixes = {};
// Generate intermediate mixes
for (size_t i = 0; i < num_sources; i++) {
write.source_statuses.status[i] =
sources[i].Tick(read.source_configurations.config[i], read.adpcm_coefficients.coeff[i]);
for (size_t mix = 0; mix < 3; mix++) {
sources[i].MixInto(intermediate_mixes[mix], mix);
}
}
// Generate final mix
write.dsp_status = mixers.Tick(read.dsp_configuration, read.intermediate_mix_samples,
write.intermediate_mix_samples, intermediate_mixes);
StereoFrame16 output_frame = mixers.GetOutput();
// Write current output frame to the shared memory region
for (size_t samplei = 0; samplei < output_frame.size(); samplei++) {
for (size_t channeli = 0; channeli < output_frame[0].size(); channeli++) {
write.final_samples.pcm16[samplei][channeli] = s16_le(output_frame[samplei][channeli]);
}
}
return output_frame;
}
// Audio output
static bool perform_time_stretching = true;
static std::unique_ptr<AudioCore::Sink> sink;
static AudioCore::TimeStretcher time_stretcher;
static void FlushResidualStretcherAudio() {
time_stretcher.Flush();
while (true) {
std::vector<s16> residual_audio = time_stretcher.Process(sink->SamplesInQueue());
if (residual_audio.empty())
break;
sink->EnqueueSamples(residual_audio.data(), residual_audio.size() / 2);
}
}
static void OutputCurrentFrame(const StereoFrame16& frame) {
if (perform_time_stretching) {
time_stretcher.AddSamples(&frame[0][0], frame.size());
std::vector<s16> stretched_samples = time_stretcher.Process(sink->SamplesInQueue());
sink->EnqueueSamples(stretched_samples.data(), stretched_samples.size() / 2);
} else {
constexpr size_t maximum_sample_latency = 2048; // about 64 miliseconds
if (sink->SamplesInQueue() > maximum_sample_latency) {
// This can occur if we're running too fast and samples are starting to back up.
// Just drop the samples.
return;
}
sink->EnqueueSamples(&frame[0][0], frame.size());
}
}
void EnableStretching(bool enable) {
if (perform_time_stretching == enable)
return;
if (!enable) {
FlushResidualStretcherAudio();
}
perform_time_stretching = enable;
}
// Public Interface
void Init() {
DSP::HLE::ResetPipes();
for (auto& source : sources) {
source.Reset();
}
mixers.Reset();
time_stretcher.Reset();
if (sink) {
time_stretcher.SetOutputSampleRate(sink->GetNativeSampleRate());
}
}
void Shutdown() {
if (perform_time_stretching) {
FlushResidualStretcherAudio();
}
}
bool Tick() {
StereoFrame16 current_frame = {};
// TODO: Check dsp::DSP semaphore (which indicates emulated application has finished writing to
// shared memory region)
current_frame = GenerateCurrentFrame();
OutputCurrentFrame(current_frame);
return true;
}
void SetSink(std::unique_ptr<AudioCore::Sink> sink_) {
sink = std::move(sink_);
time_stretcher.SetOutputSampleRate(sink->GetNativeSampleRate());
}
} // namespace HLE
} // namespace DSP
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