350c9c8d7d
this is necessary for sdl audio to work properly in sdl as of current dev version (2.0.15)
109 lines
3 KiB
C++
109 lines
3 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 <string>
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#include <vector>
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#include <SDL.h>
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#include "audio_core/audio_types.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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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::function<void(s16*, std::size_t)> cb;
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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(std::string device_name) : 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 with: {}", SDL_GetError());
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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 = 512;
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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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const char* device = nullptr;
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if (device_name != auto_device_name && !device_name.empty()) {
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device = device_name.c_str();
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}
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impl->audio_device_id =
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SDL_OpenAudioDevice(device, 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 with code {} for device \"{}\"",
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impl->audio_device_id, device_name);
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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::SetCallback(std::function<void(s16*, std::size_t)> cb) {
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impl->cb = cb;
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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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if (!impl || !impl->cb)
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return;
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const size_t num_frames = buffer_size_in_bytes / (2 * sizeof(s16));
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impl->cb(reinterpret_cast<s16*>(buffer), num_frames);
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}
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std::vector<std::string> ListSDL2SinkDevices() {
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if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
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LOG_CRITICAL(Audio_Sink, "SDL_InitSubSystem failed with: {}", SDL_GetError());
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return {};
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}
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std::vector<std::string> device_list;
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const int device_count = SDL_GetNumAudioDevices(0);
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for (int i = 0; i < device_count; ++i) {
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device_list.push_back(SDL_GetAudioDeviceName(i, 0));
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}
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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return device_list;
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}
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} // namespace AudioCore
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