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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <atomic>
#include <cstring>
#include "audio_core/cubeb_sink.h"
#include "audio_core/stream.h"
#include "audio_core/time_stretch.h"
#include "common/logging/log.h"
#include "common/ring_buffer.h"
#include "core/settings.h"
namespace AudioCore {
class CubebSinkStream final : public SinkStream {
public:
CubebSinkStream(cubeb* ctx, u32 sample_rate, u32 num_channels_, cubeb_devid output_device,
const std::string& name)
: ctx{ctx}, num_channels{std::min(num_channels_, 2u)}, time_stretch{sample_rate,
num_channels} {
cubeb_stream_params params{};
params.rate = sample_rate;
params.channels = num_channels;
params.format = CUBEB_SAMPLE_S16NE;
params.layout = num_channels == 1 ? CUBEB_LAYOUT_MONO : CUBEB_LAYOUT_STEREO;
u32 minimum_latency{};
if (cubeb_get_min_latency(ctx, ¶ms, &minimum_latency) != CUBEB_OK) {
LOG_CRITICAL(Audio_Sink, "Error getting minimum latency");
}
if (cubeb_stream_init(ctx, &stream_backend, name.c_str(), nullptr, nullptr, output_device,
¶ms, std::max(512u, minimum_latency),
&CubebSinkStream::DataCallback, &CubebSinkStream::StateCallback,
this) != CUBEB_OK) {
LOG_CRITICAL(Audio_Sink, "Error initializing cubeb stream");
return;
}
if (cubeb_stream_start(stream_backend) != CUBEB_OK) {
LOG_CRITICAL(Audio_Sink, "Error starting cubeb stream");
return;
}
}
~CubebSinkStream() {
if (!ctx) {
return;
}
if (cubeb_stream_stop(stream_backend) != CUBEB_OK) {
LOG_CRITICAL(Audio_Sink, "Error stopping cubeb stream");
}
cubeb_stream_destroy(stream_backend);
}
void EnqueueSamples(u32 source_num_channels, const std::vector<s16>& samples) override {
if (source_num_channels > num_channels) {
// Downsample 6 channels to 2
std::vector<s16> buf;
buf.reserve(samples.size() * num_channels / source_num_channels);
for (std::size_t i = 0; i < samples.size(); i += source_num_channels) {
for (std::size_t ch = 0; ch < num_channels; ch++) {
buf.push_back(samples[i + ch]);
}
}
queue.Push(buf);
return;
}
queue.Push(samples);
}
std::size_t SamplesInQueue(u32 num_channels) const override {
if (!ctx)
return 0;
return queue.Size() / num_channels;
}
void Flush() override {
should_flush = true;
}
u32 GetNumChannels() const {
return num_channels;
}
private:
std::vector<std::string> device_list;
cubeb* ctx{};
cubeb_stream* stream_backend{};
u32 num_channels{};
Common::RingBuffer<s16, 0x10000> queue;
std::array<s16, 2> last_frame;
std::atomic<bool> should_flush{};
TimeStretcher time_stretch;
static long DataCallback(cubeb_stream* stream, void* user_data, const void* input_buffer,
void* output_buffer, long num_frames);
static void StateCallback(cubeb_stream* stream, void* user_data, cubeb_state state);
};
CubebSink::CubebSink(std::string target_device_name) {
if (cubeb_init(&ctx, "yuzu", nullptr) != CUBEB_OK) {
LOG_CRITICAL(Audio_Sink, "cubeb_init failed");
return;
}
if (target_device_name != auto_device_name && !target_device_name.empty()) {
cubeb_device_collection collection;
if (cubeb_enumerate_devices(ctx, CUBEB_DEVICE_TYPE_OUTPUT, &collection) != CUBEB_OK) {
LOG_WARNING(Audio_Sink, "Audio output device enumeration not supported");
} else {
const auto collection_end{collection.device + collection.count};
const auto device{std::find_if(collection.device, collection_end,
[&](const cubeb_device_info& device) {
return target_device_name == device.friendly_name;
})};
if (device != collection_end) {
output_device = device->devid;
}
cubeb_device_collection_destroy(ctx, &collection);
}
}
}
CubebSink::~CubebSink() {
if (!ctx) {
return;
}
for (auto& sink_stream : sink_streams) {
sink_stream.reset();
}
cubeb_destroy(ctx);
}
SinkStream& CubebSink::AcquireSinkStream(u32 sample_rate, u32 num_channels,
const std::string& name) {
sink_streams.push_back(
std::make_unique<CubebSinkStream>(ctx, sample_rate, num_channels, output_device, name));
return *sink_streams.back();
}
long CubebSinkStream::DataCallback(cubeb_stream* stream, void* user_data, const void* input_buffer,
void* output_buffer, long num_frames) {
CubebSinkStream* impl = static_cast<CubebSinkStream*>(user_data);
u8* buffer = reinterpret_cast<u8*>(output_buffer);
if (!impl) {
return {};
}
const std::size_t num_channels = impl->GetNumChannels();
const std::size_t samples_to_write = num_channels * num_frames;
std::size_t samples_written;
if (Settings::values.enable_audio_stretching) {
const std::vector<s16> in{impl->queue.Pop()};
const std::size_t num_in{in.size() / num_channels};
s16* const out{reinterpret_cast<s16*>(buffer)};
const std::size_t out_frames =
impl->time_stretch.Process(in.data(), num_in, out, num_frames);
samples_written = out_frames * num_channels;
if (impl->should_flush) {
impl->time_stretch.Flush();
impl->should_flush = false;
}
} else {
samples_written = impl->queue.Pop(buffer, samples_to_write);
}
if (samples_written >= num_channels) {
std::memcpy(&impl->last_frame[0], buffer + (samples_written - num_channels) * sizeof(s16),
num_channels * sizeof(s16));
}
// Fill the rest of the frames with last_frame
for (std::size_t i = samples_written; i < samples_to_write; i += num_channels) {
std::memcpy(buffer + i * sizeof(s16), &impl->last_frame[0], num_channels * sizeof(s16));
}
return num_frames;
}
void CubebSinkStream::StateCallback(cubeb_stream* stream, void* user_data, cubeb_state state) {}
std::vector<std::string> ListCubebSinkDevices() {
std::vector<std::string> device_list;
cubeb* ctx;
if (cubeb_init(&ctx, "Citra Device Enumerator", nullptr) != CUBEB_OK) {
LOG_CRITICAL(Audio_Sink, "cubeb_init failed");
return {};
}
cubeb_device_collection collection;
if (cubeb_enumerate_devices(ctx, CUBEB_DEVICE_TYPE_OUTPUT, &collection) != CUBEB_OK) {
LOG_WARNING(Audio_Sink, "Audio output device enumeration not supported");
} else {
for (std::size_t i = 0; i < collection.count; i++) {
const cubeb_device_info& device = collection.device[i];
if (device.friendly_name) {
device_list.emplace_back(device.friendly_name);
}
}
cubeb_device_collection_destroy(ctx, &collection);
}
cubeb_destroy(ctx);
return device_list;
}
} // namespace AudioCore
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