Adding audio interface part 1

CMakeLists.txt

@@ -402,7 +402,8 @@ set(HEADER_FILES include/emulator.hpp include/helpers.hpp include/termcolor.hpp
                  include/align.hpp include/audio/aac_decoder.hpp include/PICA/pica_simd.hpp include/services/fonts.hpp
                  include/audio/audio_interpolation.hpp include/audio/hle_mixer.hpp include/audio/dsp_simd.hpp
                  include/services/dsp_firmware_db.hpp include/frontend_settings.hpp include/fs/archive_twl_photo.hpp
-                 include/fs/archive_twl_sound.hpp include/fs/archive_card_spi.hpp include/services/ns.hpp
+                 include/fs/archive_twl_sound.hpp include/fs/archive_card_spi.hpp include/services/ns.hpp include/audio/audio_device.hpp
+                 include/audio/libretro_audio_device.hpp
 )
 
 cmrc_add_resource_library(

include/audio/audio_device.hpp

@@ -0,0 +1,31 @@
+#pragma once
+#include <array>
+
+#include "config.hpp"
+#include "helpers.hpp"
+#include "ring_buffer.hpp"
+
+class AudioDeviceInterface {
+  protected:
+	using Samples = Common::RingBuffer<s16, 0x2000 * 2>;
+	Samples* samples = nullptr;
+
+	const AudioDeviceConfig& audioSettings;
+
+  public:
+	AudioDeviceInterface(Samples* samples, const AudioDeviceConfig& audioSettings) : samples(samples), audioSettings(audioSettings) {}
+
+	// Store the last stereo sample we output. We play this when underruning to avoid pops.
+	// TODO: Make this protected again before merging!!!
+	std::array<s16, 2> lastStereoSample{};
+
+	bool running = false;
+	Samples* getSamples() { return samples; }
+
+	// If safe is on, we create a null audio device
+	virtual void init(Samples& samples, bool safe = false) = 0;
+	virtual void close() = 0;
+
+	virtual void start() = 0;
+	virtual void stop() = 0;
+};

include/audio/libretro_audio_device.hpp

@@ -0,0 +1,33 @@
+#pragma once
+#include <atomic>
+#include <string>
+#include <vector>
+
+#include "audio/audio_device.hpp"
+
+class LibretroAudioDevice : public AudioDeviceInterface {
+	bool initialized = false;
+
+  public:
+	LibretroAudioDevice(const AudioDeviceConfig& audioSettings) : AudioDeviceInterface(nullptr, audioSettings), initialized(false) {
+		running = false;
+	}
+
+	void init(Samples& samples, bool safe = false) override {
+		this->samples = &samples;
+
+		initialized = true;
+		running = false;
+	}
+
+	void close() override {
+		initialized = false;
+		running = false;
+	};
+
+	void start() override { running = true; }
+	void stop() override { running = false; };
+
+	bool isInitialized() const { return initialized; }
+	bool isRunning() const { return running; }
+};

include/audio/miniaudio_device.hpp

@@ -3,40 +3,31 @@
 #include <string>
 #include <vector>
 
-#include "config.hpp"
-#include "helpers.hpp"
+#include "audio/audio_device.hpp"
 #include "miniaudio.h"
-#include "ring_buffer.hpp"
 
-class MiniAudioDevice {
-	public:
-	using Samples = Common::RingBuffer<ma_int16, 0x2000 * 2>;
+class MiniAudioDevice : public AudioDeviceInterface {
 	static constexpr ma_uint32 sampleRate = 32768;  // 3DS sample rate
 	static constexpr ma_uint32 channelCount = 2;    // Audio output is stereo
 
+	bool initialized = false;
+
 	ma_device device;
 	ma_context context;
 	ma_device_config deviceConfig;
-	Samples* samples = nullptr;
-
-	const AudioDeviceConfig& audioSettings;
-
-	bool initialized = false;
-	bool running = false;
 
 	// Store the last stereo sample we output. We play this when underruning to avoid pops.
-	std::array<s16, 2> lastStereoSample;
 	std::vector<std::string> audioDevices;
 
   public:
 	MiniAudioDevice(const AudioDeviceConfig& audioSettings);
 
 	// If safe is on, we create a null audio device
-	void init(Samples& samples, bool safe = false);
-	void close();
+	void init(Samples& samples, bool safe = false) override;
+	void close() override;
 
-	void start();
-	void stop();
+	void start() override;
+	void stop() override;
 
 	bool isInitialized() const { return initialized; }
 };

include/emulator.hpp

@@ -8,6 +8,7 @@
 
 #include "PICA/gpu.hpp"
 #include "audio/dsp_core.hpp"
+#include "audio/libretro_audio_device.hpp"
 #include "audio/miniaudio_device.hpp"
 #include "cheats.hpp"
 #include "config.hpp"
@@ -48,7 +49,11 @@ class Emulator {
 	Scheduler scheduler;
 
 	Crypto::AESEngine aesEngine;
+#ifndef __LIBRETRO__
 	MiniAudioDevice audioDevice;
+#else
+	LibretroAudioDevice audioDevice;
+#endif
 	Cheats cheats;
 
   public:
@@ -126,6 +131,7 @@ class Emulator {
 	LuaManager& getLua() { return lua; }
 	Scheduler& getScheduler() { return scheduler; }
 	Memory& getMemory() { return memory; }
+	AudioDeviceInterface& getAudioDevice() { return audioDevice; }
 
 	RendererType getRendererType() const { return config.rendererType; }
 	Renderer* getRenderer() { return gpu.getRenderer(); }

src/core/audio/miniaudio_device.cpp

@@ -7,10 +7,10 @@
 
 #include "helpers.hpp"
 
-MiniAudioDevice::MiniAudioDevice(const AudioDeviceConfig& audioSettings)
-	: initialized(false), running(false), samples(nullptr), audioSettings(audioSettings) {}
+MiniAudioDevice::MiniAudioDevice(const AudioDeviceConfig& audioSettings) : AudioDeviceInterface(nullptr, audioSettings), initialized(false) {
+	running = false;
+}
 
-#ifndef __LIBRETRO__
 void MiniAudioDevice::init(Samples& samples, bool safe) {
 	this->samples = &samples;
 	running = false;
@@ -213,5 +213,4 @@ void MiniAudioDevice::close() {
 		ma_device_uninit(&device);
 		ma_context_uninit(&context);
 	}
-}
-#endif
+}

src/libretro_core.cpp

@@ -22,7 +22,6 @@ static bool usingGLES = false;
 
 std::unique_ptr<Emulator> emulator;
 RendererGL* renderer;
-MiniAudioDevice* audioDevice;
 
 std::filesystem::path Emulator::getConfigPath() {
 	return std::filesystem::path(savePath / "config.toml");
@@ -32,27 +31,6 @@ std::filesystem::path Emulator::getAppDataRoot() {
 	return std::filesystem::path(savePath / "Emulator Files");
 }
 
-void MiniAudioDevice::init(Samples& samples, bool safe) {
-	this->samples = &samples;
-	initialized = true;
-	running = false;
-
-	audioDevice = this;
-}
-
-void MiniAudioDevice::start() {
-	running = true;
-}
-
-void MiniAudioDevice::stop() {
-	running = false;
-}
-
-void MiniAudioDevice::close() {
-	running = false;
-	initialized = false;
-}
-
 static void* getGLProcAddress(const char* name) {
 	return (void*)hwRender.get_proc_address(name);
 }
@@ -411,29 +389,30 @@ void retro_run() {
 	emulator->runFrame();
 
 	videoCallback(RETRO_HW_FRAME_BUFFER_VALID, emulator->width, emulator->height, 0);
+	auto& audioDevice = emulator->getAudioDevice();
 
-	if (audioDevice->running) {
+	if (audioDevice.running) {
 		static constexpr int frameCount = 547;
 		static constexpr int channelCount = 2;
 		static int16_t audioBuffer[frameCount * channelCount];
 
 		usize samplesWritten = 0;
-		samplesWritten += audioDevice->samples->pop(audioBuffer, frameCount * channelCount);
+		samplesWritten += audioDevice.getSamples()->pop(audioBuffer, frameCount * channelCount);
 
 		// Get the last sample for underrun handling
 		if (samplesWritten != 0) {
 			std::memcpy(
-				&audioDevice->lastStereoSample[0],
+				&audioDevice.lastStereoSample[0],
 				&audioBuffer[(samplesWritten - 1) * 2],
-				sizeof(audioDevice->lastStereoSample)
+				sizeof(audioDevice.lastStereoSample)
 			);
 		}
 
 		// If underruning, copy the last output sample
 		{
 			s16* pointer = &audioBuffer[samplesWritten * 2];
-			s16 l = audioDevice->lastStereoSample[0];
-			s16 r = audioDevice->lastStereoSample[1];
+			s16 l = audioDevice.lastStereoSample[0];
+			s16 r = audioDevice.lastStereoSample[1];
 
 			for (usize i = samplesWritten; i < frameCount; i++) {
 				*pointer++ = l;