127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
// Copyright 2016 Citra Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <list>
|
|
#include <vector>
|
|
|
|
#include <SDL.h>
|
|
|
|
#include "audio_core/audio_core.h"
|
|
#include "audio_core/sdl2_sink.h"
|
|
|
|
#include "common/assert.h"
|
|
#include "common/logging/log.h"
|
|
#include <numeric>
|
|
|
|
namespace AudioCore {
|
|
|
|
struct SDL2Sink::Impl {
|
|
unsigned int sample_rate = 0;
|
|
|
|
SDL_AudioDeviceID audio_device_id = 0;
|
|
|
|
std::list<std::vector<s16>> queue;
|
|
|
|
static void Callback(void* impl_, u8* buffer, int buffer_size_in_bytes);
|
|
};
|
|
|
|
SDL2Sink::SDL2Sink() : impl(std::make_unique<Impl>()) {
|
|
if (SDL_Init(SDL_INIT_AUDIO) < 0) {
|
|
LOG_CRITICAL(Audio_Sink, "SDL_Init(SDL_INIT_AUDIO) failed");
|
|
impl->audio_device_id = 0;
|
|
return;
|
|
}
|
|
|
|
SDL_AudioSpec desired_audiospec;
|
|
SDL_zero(desired_audiospec);
|
|
desired_audiospec.format = AUDIO_S16;
|
|
desired_audiospec.channels = 2;
|
|
desired_audiospec.freq = native_sample_rate;
|
|
desired_audiospec.samples = 1024;
|
|
desired_audiospec.userdata = impl.get();
|
|
desired_audiospec.callback = &Impl::Callback;
|
|
|
|
SDL_AudioSpec obtained_audiospec;
|
|
SDL_zero(obtained_audiospec);
|
|
|
|
impl->audio_device_id = SDL_OpenAudioDevice(nullptr, false, &desired_audiospec, &obtained_audiospec, 0);
|
|
if (impl->audio_device_id <= 0) {
|
|
LOG_CRITICAL(Audio_Sink, "SDL_OpenAudioDevice failed");
|
|
return;
|
|
}
|
|
|
|
impl->sample_rate = obtained_audiospec.freq;
|
|
|
|
// SDL2 audio devices start out paused, unpause it:
|
|
SDL_PauseAudioDevice(impl->audio_device_id, 0);
|
|
}
|
|
|
|
SDL2Sink::~SDL2Sink() {
|
|
if (impl->audio_device_id <= 0)
|
|
return;
|
|
|
|
SDL_CloseAudioDevice(impl->audio_device_id);
|
|
}
|
|
|
|
unsigned int SDL2Sink::GetNativeSampleRate() const {
|
|
if (impl->audio_device_id <= 0)
|
|
return native_sample_rate;
|
|
|
|
return impl->sample_rate;
|
|
}
|
|
|
|
void SDL2Sink::EnqueueSamples(const std::vector<s16>& samples) {
|
|
if (impl->audio_device_id <= 0)
|
|
return;
|
|
|
|
ASSERT_MSG(samples.size() % 2 == 0, "Samples must be in interleaved stereo PCM16 format (size must be a multiple of two)");
|
|
|
|
SDL_LockAudioDevice(impl->audio_device_id);
|
|
impl->queue.emplace_back(samples);
|
|
SDL_UnlockAudioDevice(impl->audio_device_id);
|
|
}
|
|
|
|
size_t SDL2Sink::SamplesInQueue() const {
|
|
if (impl->audio_device_id <= 0)
|
|
return 0;
|
|
|
|
SDL_LockAudioDevice(impl->audio_device_id);
|
|
|
|
size_t total_size = std::accumulate(impl->queue.begin(), impl->queue.end(), static_cast<size_t>(0),
|
|
[](size_t sum, const auto& buffer) {
|
|
// Division by two because each stereo sample is made of two s16.
|
|
return sum + buffer.size() / 2;
|
|
});
|
|
|
|
SDL_UnlockAudioDevice(impl->audio_device_id);
|
|
|
|
return total_size;
|
|
}
|
|
|
|
void SDL2Sink::Impl::Callback(void* impl_, u8* buffer, int buffer_size_in_bytes) {
|
|
Impl* impl = reinterpret_cast<Impl*>(impl_);
|
|
|
|
size_t remaining_size = static_cast<size_t>(buffer_size_in_bytes) / sizeof(s16); // Keep track of size in 16-bit increments.
|
|
|
|
while (remaining_size > 0 && !impl->queue.empty()) {
|
|
if (impl->queue.front().size() <= remaining_size) {
|
|
memcpy(buffer, impl->queue.front().data(), impl->queue.front().size() * sizeof(s16));
|
|
buffer += impl->queue.front().size() * sizeof(s16);
|
|
remaining_size -= impl->queue.front().size();
|
|
impl->queue.pop_front();
|
|
} else {
|
|
memcpy(buffer, impl->queue.front().data(), remaining_size * sizeof(s16));
|
|
buffer += remaining_size * sizeof(s16);
|
|
impl->queue.front().erase(impl->queue.front().begin(), impl->queue.front().begin() + remaining_size);
|
|
remaining_size = 0;
|
|
}
|
|
}
|
|
|
|
if (remaining_size > 0) {
|
|
memset(buffer, 0, remaining_size * sizeof(s16));
|
|
}
|
|
}
|
|
|
|
} // namespace AudioCore
|