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// Copyright 2023 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <vector>
#include <AL/al.h>
#include <AL/alc.h>
#include <AL/alext.h>
#include "audio_core/audio_types.h"
#include "audio_core/openal_sink.h"
#include "common/logging/log.h"
namespace AudioCore {
struct OpenALSink::Impl {
unsigned int sample_rate = 0;
ALCdevice* device = nullptr;
ALCcontext* context = nullptr;
ALuint buffer = 0;
ALuint source = 0;
std::function<void(s16*, std::size_t)> cb;
static ALsizei Callback(void* impl_, void* buffer, ALsizei buffer_size_in_bytes);
};
OpenALSink::OpenALSink(std::string device_name) : impl(std::make_unique<Impl>()) {
impl->device = alcOpenDevice(
device_name != auto_device_name && !device_name.empty() ? device_name.c_str() : nullptr);
if (!impl->device) {
LOG_CRITICAL(Audio_Sink, "alcOpenDevice failed.");
Close();
return;
}
impl->context = alcCreateContext(impl->device, nullptr);
if (impl->context == nullptr) {
LOG_CRITICAL(Audio_Sink, "alcCreateContext failed: {}", alcGetError(impl->device));
Close();
return;
}
if (alcMakeContextCurrent(impl->context) == ALC_FALSE) {
LOG_CRITICAL(Audio_Sink, "alcMakeContextCurrent failed: {}", alcGetError(impl->device));
Close();
return;
}
if (alIsExtensionPresent("AL_SOFT_callback_buffer") == AL_FALSE) {
if (alGetError() != AL_NO_ERROR) {
LOG_CRITICAL(Audio_Sink, "alIsExtensionPresent failed: {}", alGetError());
} else {
LOG_CRITICAL(Audio_Sink, "Missing required extension AL_SOFT_callback_buffer.");
}
Close();
return;
}
alGenBuffers(1, &impl->buffer);
if (alGetError() != AL_NO_ERROR) {
LOG_CRITICAL(Audio_Sink, "alGetError failed: {}", alGetError());
Close();
return;
}
alGenSources(1, &impl->source);
if (alGetError() != AL_NO_ERROR) {
LOG_CRITICAL(Audio_Sink, "alGenSources failed: {}", alGetError());
Close();
return;
}
auto alBufferCallbackSOFT =
reinterpret_cast<LPALBUFFERCALLBACKSOFT>(alGetProcAddress("alBufferCallbackSOFT"));
alBufferCallbackSOFT(impl->buffer, AL_FORMAT_STEREO16, native_sample_rate, &Impl::Callback,
impl.get());
if (alGetError() != AL_NO_ERROR) {
LOG_CRITICAL(Audio_Sink, "alBufferCallbackSOFT failed: {}", alGetError());
Close();
return;
}
alSourcei(impl->source, AL_BUFFER, static_cast<ALint>(impl->buffer));
if (alGetError() != AL_NO_ERROR) {
LOG_CRITICAL(Audio_Sink, "alSourcei(AL_BUFFER) failed: {}", alGetError());
Close();
return;
}
if (alIsExtensionPresent("AL_SOFT_direct_channels") == AL_TRUE) {
// Set up direct channels to bypass processing spatialization and other effects we don't
// need.
alSourcei(impl->source, AL_DIRECT_CHANNELS_SOFT, AL_TRUE);
if (alGetError() != AL_NO_ERROR) {
LOG_CRITICAL(Audio_Sink, "alSourcei(AL_DIRECT_CHANNELS_SOFT) failed: {}", alGetError());
Close();
return;
}
} else {
LOG_WARNING(Audio_Sink,
"AL_SOFT_direct_channels not present, audio latency may be higher.");
}
alSourcePlay(impl->source);
if (alGetError() != AL_NO_ERROR) {
LOG_CRITICAL(Audio_Sink, "alSourcePlay failed: {}", alGetError());
Close();
return;
}
}
OpenALSink::~OpenALSink() {
Close();
}
void OpenALSink::Close() {
if (impl->source) {
alSourceStop(impl->source);
alDeleteSources(1, &impl->source);
impl->source = 0;
}
if (impl->buffer) {
alDeleteBuffers(1, &impl->buffer);
impl->buffer = 0;
}
if (impl->context) {
alcDestroyContext(impl->context);
impl->context = nullptr;
}
if (impl->device) {
alcCloseDevice(impl->device);
impl->device = nullptr;
}
}
unsigned int OpenALSink::GetNativeSampleRate() const {
return native_sample_rate;
}
void OpenALSink::SetCallback(std::function<void(s16*, std::size_t)> cb) {
impl->cb = cb;
}
ALsizei OpenALSink::Impl::Callback(void* impl_, void* buffer, ALsizei buffer_size_in_bytes) {
auto impl = reinterpret_cast<Impl*>(impl_);
if (!impl || !impl->cb) {
return 0;
}
const std::size_t num_frames = buffer_size_in_bytes / (2 * sizeof(s16));
impl->cb(reinterpret_cast<s16*>(buffer), num_frames);
return buffer_size_in_bytes;
}
std::vector<std::string> ListOpenALSinkDevices() {
const char* devices_str;
if (alcIsExtensionPresent(nullptr, "ALC_ENUMERATE_ALL_EXT") != AL_FALSE) {
devices_str = alcGetString(nullptr, ALC_ALL_DEVICES_SPECIFIER);
} else if (alcIsExtensionPresent(nullptr, "ALC_ENUMERATION_EXT") != AL_FALSE) {
devices_str = alcGetString(nullptr, ALC_DEVICE_SPECIFIER);
} else {
LOG_WARNING(Audio_Sink,
"Missing OpenAL device enumeration extensions, cannot list audio devices.");
return {};
}
if (!devices_str || *devices_str == '\0') {
return {};
}
std::vector<std::string> device_list;
while (*devices_str != '\0') {
device_list.emplace_back(devices_str);
devices_str += strlen(devices_str) + 1;
}
return device_list;
}
} // namespace AudioCore
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