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-rw-r--r--src/audio_core/CMakeLists.txt11
-rw-r--r--src/audio_core/sdl2_sink.cpp126
-rw-r--r--src/audio_core/sdl2_sink.h30
-rw-r--r--src/audio_core/sink.h2
-rw-r--r--src/audio_core/sink_details.cpp7
5 files changed, 175 insertions, 1 deletions
diff --git a/src/audio_core/CMakeLists.txt b/src/audio_core/CMakeLists.txt
index 5a2747e78..899155a30 100644
--- a/src/audio_core/CMakeLists.txt
+++ b/src/audio_core/CMakeLists.txt
@@ -23,7 +23,18 @@ set(HEADERS
include_directories(../../externals/soundtouch/include)
+if(SDL2_FOUND)
+ set(SRCS ${SRCS} sdl2_sink.cpp)
+ set(HEADERS ${HEADERS} sdl2_sink.h)
+ include_directories(${SDL2_INCLUDE_DIR})
+endif()
+
create_directory_groups(${SRCS} ${HEADERS})
add_library(audio_core STATIC ${SRCS} ${HEADERS})
target_link_libraries(audio_core SoundTouch)
+
+if(SDL2_FOUND)
+ target_link_libraries(audio_core ${SDL2_LIBRARY})
+ set_property(TARGET audio_core APPEND PROPERTY COMPILE_DEFINITIONS HAVE_SDL2)
+endif()
diff --git a/src/audio_core/sdl2_sink.cpp b/src/audio_core/sdl2_sink.cpp
new file mode 100644
index 000000000..dc75c04ee
--- /dev/null
+++ b/src/audio_core/sdl2_sink.cpp
@@ -0,0 +1,126 @@
+// 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
diff --git a/src/audio_core/sdl2_sink.h b/src/audio_core/sdl2_sink.h
new file mode 100644
index 000000000..0f296b673
--- /dev/null
+++ b/src/audio_core/sdl2_sink.h
@@ -0,0 +1,30 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstddef>
+#include <memory>
+
+#include "audio_core/sink.h"
+
+namespace AudioCore {
+
+class SDL2Sink final : public Sink {
+public:
+ SDL2Sink();
+ ~SDL2Sink() override;
+
+ unsigned int GetNativeSampleRate() const override;
+
+ void EnqueueSamples(const std::vector<s16>& samples) override;
+
+ size_t SamplesInQueue() const override;
+
+private:
+ struct Impl;
+ std::unique_ptr<Impl> impl;
+};
+
+} // namespace AudioCore
diff --git a/src/audio_core/sink.h b/src/audio_core/sink.h
index cad21a85e..1c881c3d2 100644
--- a/src/audio_core/sink.h
+++ b/src/audio_core/sink.h
@@ -19,7 +19,7 @@ public:
virtual ~Sink() = default;
/// The native rate of this sink. The sink expects to be fed samples that respect this. (Units: samples/sec)
- virtual unsigned GetNativeSampleRate() const = 0;
+ virtual unsigned int GetNativeSampleRate() const = 0;
/**
* Feed stereo samples to sink.
diff --git a/src/audio_core/sink_details.cpp b/src/audio_core/sink_details.cpp
index d2cc74103..ba5e83d17 100644
--- a/src/audio_core/sink_details.cpp
+++ b/src/audio_core/sink_details.cpp
@@ -8,10 +8,17 @@
#include "audio_core/null_sink.h"
#include "audio_core/sink_details.h"
+#ifdef HAVE_SDL2
+#include "audio_core/sdl2_sink.h"
+#endif
+
namespace AudioCore {
// g_sink_details is ordered in terms of desirability, with the best choice at the top.
const std::vector<SinkDetails> g_sink_details = {
+#ifdef HAVE_SDL2
+ { "sdl2", []() { return std::make_unique<SDL2Sink>(); } },
+#endif
{ "null", []() { return std::make_unique<NullSink>(); } },
};
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