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// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <span>
#include <vector>
#include <SDL.h>
#include "audio_core/common/common.h"
#include "audio_core/sink/sdl2_sink.h"
#include "audio_core/sink/sink_stream.h"
#include "common/logging/log.h"
#include "core/core.h"
namespace AudioCore::Sink {
/**
* SDL sink stream, responsible for sinking samples to hardware.
*/
class SDLSinkStream final : public SinkStream {
public:
/**
* Create a new sink stream.
*
* @param device_channels_ - Number of channels supported by the hardware.
* @param system_channels_ - Number of channels the audio systems expect.
* @param output_device - Name of the output device to use for this stream.
* @param input_device - Name of the input device to use for this stream.
* @param type_ - Type of this stream.
* @param system_ - Core system.
* @param event - Event used only for audio renderer, signalled on buffer consume.
*/
SDLSinkStream(u32 device_channels_, u32 system_channels_, const std::string& output_device,
const std::string& input_device, StreamType type_, Core::System& system_)
: SinkStream{system_, type_} {
system_channels = system_channels_;
device_channels = device_channels_;
SDL_AudioSpec spec;
spec.freq = TargetSampleRate;
spec.channels = static_cast<u8>(device_channels);
spec.format = AUDIO_S16SYS;
spec.samples = TargetSampleCount * 2;
spec.callback = &SDLSinkStream::DataCallback;
spec.userdata = this;
std::string device_name{output_device};
bool capture{false};
if (type == StreamType::In) {
device_name = input_device;
capture = true;
}
SDL_AudioSpec obtained;
if (device_name.empty()) {
device = SDL_OpenAudioDevice(nullptr, capture, &spec, &obtained, false);
} else {
device = SDL_OpenAudioDevice(device_name.c_str(), capture, &spec, &obtained, false);
}
if (device == 0) {
LOG_CRITICAL(Audio_Sink, "Error opening SDL audio device: {}", SDL_GetError());
return;
}
LOG_INFO(Service_Audio,
"Opening SDL stream {} with: rate {} channels {} (system channels {}) "
" samples {}",
device, obtained.freq, obtained.channels, system_channels, obtained.samples);
}
/**
* Destroy the sink stream.
*/
~SDLSinkStream() override {
LOG_DEBUG(Service_Audio, "Destructing SDL stream {}", name);
Finalize();
}
/**
* Finalize the sink stream.
*/
void Finalize() override {
if (device == 0) {
return;
}
Stop();
SDL_CloseAudioDevice(device);
}
/**
* Start the sink stream.
*
* @param resume - Set to true if this is resuming the stream a previously-active stream.
* Default false.
*/
void Start(bool resume = false) override {
if (device == 0 || !paused) {
return;
}
paused = false;
SDL_PauseAudioDevice(device, 0);
}
/**
* Stop the sink stream.
*/
void Stop() override {
if (device == 0 || paused) {
return;
}
paused = true;
SDL_PauseAudioDevice(device, 1);
}
private:
/**
* Main callback from SDL. Either expects samples from us (audio render/audio out), or will
* provide samples to be copied (audio in).
*
* @param userdata - Custom data pointer passed along, points to a SDLSinkStream.
* @param stream - Buffer of samples to be filled or read.
* @param len - Length of the stream in bytes.
*/
static void DataCallback(void* userdata, Uint8* stream, int len) {
auto* impl = static_cast<SDLSinkStream*>(userdata);
if (!impl) {
return;
}
const std::size_t num_channels = impl->GetDeviceChannels();
const std::size_t frame_size = num_channels;
const std::size_t num_frames{len / num_channels / sizeof(s16)};
if (impl->type == StreamType::In) {
std::span<const s16> input_buffer{reinterpret_cast<const s16*>(stream),
num_frames * frame_size};
impl->ProcessAudioIn(input_buffer, num_frames);
} else {
std::span<s16> output_buffer{reinterpret_cast<s16*>(stream), num_frames * frame_size};
impl->ProcessAudioOutAndRender(output_buffer, num_frames);
}
}
/// SDL device id of the opened input/output device
SDL_AudioDeviceID device{};
};
SDLSink::SDLSink(std::string_view target_device_name) {
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
LOG_CRITICAL(Audio_Sink, "SDL_InitSubSystem audio failed: {}", SDL_GetError());
return;
}
}
if (target_device_name != auto_device_name && !target_device_name.empty()) {
output_device = target_device_name;
} else {
output_device.clear();
}
device_channels = 2;
}
SDLSink::~SDLSink() = default;
SinkStream* SDLSink::AcquireSinkStream(Core::System& system, u32 system_channels,
const std::string&, StreamType type) {
SinkStreamPtr& stream = sink_streams.emplace_back(std::make_unique<SDLSinkStream>(
device_channels, system_channels, output_device, input_device, type, system));
return stream.get();
}
void SDLSink::CloseStream(SinkStream* stream) {
for (size_t i = 0; i < sink_streams.size(); i++) {
if (sink_streams[i].get() == stream) {
sink_streams[i].reset();
sink_streams.erase(sink_streams.begin() + i);
break;
}
}
}
void SDLSink::CloseStreams() {
sink_streams.clear();
}
f32 SDLSink::GetDeviceVolume() const {
if (sink_streams.empty()) {
return 1.0f;
}
return sink_streams[0]->GetDeviceVolume();
}
void SDLSink::SetDeviceVolume(f32 volume) {
for (auto& stream : sink_streams) {
stream->SetDeviceVolume(volume);
}
}
void SDLSink::SetSystemVolume(f32 volume) {
for (auto& stream : sink_streams) {
stream->SetSystemVolume(volume);
}
}
std::vector<std::string> ListSDLSinkDevices(bool capture) {
std::vector<std::string> device_list;
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
LOG_CRITICAL(Audio_Sink, "SDL_InitSubSystem audio failed: {}", SDL_GetError());
return {};
}
}
const int device_count = SDL_GetNumAudioDevices(capture);
for (int i = 0; i < device_count; ++i) {
if (const char* name = SDL_GetAudioDeviceName(i, capture)) {
device_list.emplace_back(name);
}
}
return device_list;
}
u32 GetSDLLatency() {
return TargetSampleCount * 2;
}
} // namespace AudioCore::Sink
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