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