citra/src/audio_core/cubeb_sink.cpp

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// Copyright 2018 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <vector>
#include <cubeb/cubeb.h>
#include "audio_core/audio_types.h"
#include "audio_core/cubeb_sink.h"
#include "common/logging/log.h"
#include "core/settings.h"
namespace AudioCore {
struct CubebSink::Impl {
unsigned int sample_rate = 0;
cubeb* ctx = nullptr;
cubeb_stream* stream = nullptr;
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() : impl(std::make_unique<Impl>()) {
if (cubeb_init(&impl->ctx, "Citra", nullptr) != CUBEB_OK) {
NGLOG_CRITICAL(Audio_Sink, "cubeb_init failed");
return;
}
const char* target_device_name = nullptr;
cubeb_devid output_device = nullptr;
cubeb_stream_params params;
params.rate = native_sample_rate;
params.channels = 2;
params.format = CUBEB_SAMPLE_S16NE;
params.layout = CUBEB_LAYOUT_STEREO;
impl->sample_rate = native_sample_rate;
u32 minimum_latency = 0;
if (cubeb_get_min_latency(impl->ctx, &params, &minimum_latency) != CUBEB_OK)
NGLOG_CRITICAL(Audio_Sink, "Error getting minimum latency");
cubeb_device_collection collection;
if (cubeb_enumerate_devices(impl->ctx, CUBEB_DEVICE_TYPE_OUTPUT, &collection) != CUBEB_OK) {
NGLOG_WARNING(Audio_Sink, "Audio output device enumeration not supported");
} else {
if (collection.count >= 1 && Settings::values.audio_device_id != "auto" &&
!Settings::values.audio_device_id.empty()) {
target_device_name = Settings::values.audio_device_id.c_str();
}
for (size_t i = 0; i < collection.count; i++) {
const cubeb_device_info& device = collection.device[i];
device_list.emplace_back(device.friendly_name);
if (target_device_name && strcmp(target_device_name, device.friendly_name) == 0) {
output_device = device.devid;
}
}
cubeb_device_collection_destroy(impl->ctx, &collection);
}
if (cubeb_stream_init(impl->ctx, &impl->stream, "Citra Audio Output", nullptr, nullptr,
output_device, &params, std::max(512u, minimum_latency),
&Impl::DataCallback, &Impl::StateCallback, impl.get()) != CUBEB_OK) {
NGLOG_CRITICAL(Audio_Sink, "Error initializing cubeb stream");
return;
}
if (cubeb_stream_start(impl->stream) != CUBEB_OK) {
NGLOG_CRITICAL(Audio_Sink, "Error starting cubeb stream");
return;
}
}
CubebSink::~CubebSink() {
if (!impl->ctx)
return;
if (cubeb_stream_stop(impl->stream) != CUBEB_OK) {
NGLOG_CRITICAL(Audio_Sink, "Error stopping cubeb stream");
}
cubeb_stream_destroy(impl->stream);
cubeb_destroy(impl->ctx);
}
unsigned int CubebSink::GetNativeSampleRate() const {
if (!impl->ctx)
return native_sample_rate;
return impl->sample_rate;
}
std::vector<std::string> CubebSink::GetDeviceList() const {
return device_list;
}
void CubebSink::EnqueueSamples(const s16* samples, size_t sample_count) {
if (!impl->ctx)
return;
impl->queue.reserve(impl->queue.size() + sample_count * 2);
std::copy(samples, samples + sample_count * 2, std::back_inserter(impl->queue));
}
size_t CubebSink::SamplesInQueue() const {
if (!impl->ctx)
return 0;
return impl->queue.size() / 2;
}
void CubebSink::SetDevice(int device_id) {}
long CubebSink::Impl::DataCallback(cubeb_stream* stream, void* user_data, const void* input_buffer,
void* output_buffer, long num_frames) {
Impl* impl = static_cast<Impl*>(user_data);
u8* buffer = reinterpret_cast<u8*>(output_buffer);
if (!impl)
return 0;
size_t frames_to_write = std::min(impl->queue.size() / 2, static_cast<size_t>(num_frames));
memcpy(buffer, impl->queue.data(), frames_to_write * sizeof(s16) * 2);
impl->queue.erase(impl->queue.begin(), impl->queue.begin() + frames_to_write * 2);
if (frames_to_write < num_frames) {
// Fill the rest of the frames with silence
memset(buffer + frames_to_write * sizeof(s16) * 2, 0,
(num_frames - frames_to_write) * sizeof(s16) * 2);
}
return num_frames;
}
void CubebSink::Impl::StateCallback(cubeb_stream* stream, void* user_data, cubeb_state state) {}
} // namespace AudioCore