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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 <cstring>
#include <mutex>
#include "audio_core/cubeb_sink.h"
#include "audio_core/stream.h"
#include "common/logging/log.h"
namespace AudioCore {
class SinkStreamImpl final : public SinkStream {
public:
SinkStreamImpl(cubeb* ctx, u32 sample_rate, u32 num_channels_, cubeb_devid output_device,
const std::string& name)
: ctx{ctx}, num_channels{num_channels_} {
if (num_channels == 6) {
// 6-channel audio does not seem to work with cubeb + SDL, so we downsample this to 2
// channel for now
is_6_channel = true;
num_channels = 2;
}
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),
&SinkStreamImpl::DataCallback, &SinkStreamImpl::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;
}
}
~SinkStreamImpl() {
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 num_channels, const std::vector<s16>& samples) override {
if (!ctx) {
return;
}
std::lock_guard lock{queue_mutex};
queue.reserve(queue.size() + samples.size() * GetNumChannels());
if (is_6_channel) {
// Downsample 6 channels to 2
const size_t sample_count_copy_size = samples.size() * 2;
queue.reserve(sample_count_copy_size);
for (size_t i = 0; i < samples.size(); i += num_channels) {
queue.push_back(samples[i]);
queue.push_back(samples[i + 1]);
}
} else {
// Copy as-is
std::copy(samples.begin(), samples.end(), std::back_inserter(queue));
}
}
size_t SamplesInQueue(u32 num_channels) const {
if (!ctx)
return 0;
return queue.size() / num_channels;
}
u32 GetNumChannels() const {
return num_channels;
}
private:
std::vector<std::string> device_list;
cubeb* ctx{};
cubeb_stream* stream_backend{};
u32 num_channels{};
bool is_6_channel{};
std::mutex queue_mutex;
std::vector<s16> queue;
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<SinkStreamImpl>(ctx, sample_rate, num_channels, output_device, name));
return *sink_streams.back();
}
long SinkStreamImpl::DataCallback(cubeb_stream* stream, void* user_data, const void* input_buffer,
void* output_buffer, long num_frames) {
SinkStreamImpl* impl = static_cast<SinkStreamImpl*>(user_data);
u8* buffer = reinterpret_cast<u8*>(output_buffer);
if (!impl) {
return {};
}
std::lock_guard lock{impl->queue_mutex};
const size_t frames_to_write{
std::min(impl->queue.size() / impl->GetNumChannels(), static_cast<size_t>(num_frames))};
memcpy(buffer, impl->queue.data(), frames_to_write * sizeof(s16) * impl->GetNumChannels());
impl->queue.erase(impl->queue.begin(),
impl->queue.begin() + frames_to_write * impl->GetNumChannels());
if (frames_to_write < num_frames) {
// Fill the rest of the frames with silence
memset(buffer + frames_to_write * sizeof(s16) * impl->GetNumChannels(), 0,
(num_frames - frames_to_write) * sizeof(s16) * impl->GetNumChannels());
}
return num_frames;
}
void SinkStreamImpl::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 (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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