Implement audio output

src/core/audio/miniaudio_device.cpp

@@ -0,0 +1,119 @@
+#include "audio/miniaudio_device.hpp"
+
+#include "helpers.hpp"
+
+MiniAudioDevice::MiniAudioDevice() : initialized(false), running(false), samples(nullptr) {}
+
+void MiniAudioDevice::init(Samples& samples, bool safe) {
+	this->samples = &samples;
+
+	// Probe for device and available backends and initialize audio
+	ma_backend backends[ma_backend_null + 1];
+	unsigned count = 0;
+
+	if (safe) {
+		backends[0] = ma_backend_null;
+		count = 1;
+	} else {
+		bool found = false;
+		for (uint i = 0; i <= ma_backend_null; i++) {
+			ma_backend backend = ma_backend(i);
+			if (!ma_is_backend_enabled(backend)) {
+				continue;
+			}
+
+			backends[count++] = backend;
+			printf("Found audio backend: %s\n", ma_get_backend_name(backend));
+
+			// TODO: Make backend selectable here
+			found = true;
+			//count = 1;
+			//backends[0] = backend;
+		}
+
+		if (!found) {
+			initialized = false;
+
+			Helpers::warn("No valid audio backend found\n");
+			return;
+		}
+	}
+
+	if (ma_context_init(backends, count, nullptr, &context) != MA_SUCCESS) {
+		initialized = false;
+
+		Helpers::warn("Unable to initialize audio context");
+		return;
+	}
+	audioDevices.clear();
+
+	struct UserContext {
+		MiniAudioDevice* miniAudio;
+		ma_device_config& config;
+		bool found = false;
+	};
+	UserContext userContext = {.miniAudio = this, .config = deviceConfig};
+
+	ma_context_enumerate_devices(
+		&context,
+		[](ma_context* pContext, ma_device_type deviceType, const ma_device_info* pInfo, void* pUserData) -> ma_bool32 {
+			if (deviceType != ma_device_type_playback) {
+				return true;
+			}
+
+			UserContext* userContext = reinterpret_cast<UserContext*>(pUserData);
+			userContext->miniAudio->audioDevices.push_back(pInfo->name);
+
+			// TODO: Check if this is the device we want here
+			userContext->config.playback.pDeviceID = &pInfo->id;
+			userContext->found = true;
+			return true;
+		},
+		&userContext
+	);
+
+	if (!userContext.found) {
+		Helpers::warn("MiniAudio: Device not found");
+	}
+
+	deviceConfig = ma_device_config_init(ma_device_type_playback);
+	// The 3DS outputs s16 stereo audio @ 32768 Hz
+	deviceConfig.playback.format = ma_format_s16;
+	deviceConfig.playback.channels = 2;
+	deviceConfig.sampleRate = 32768;
+	//deviceConfig.periodSizeInFrames = 64;
+	//deviceConfig.periods = 2;
+	deviceConfig.pUserData = this;
+	deviceConfig.aaudio.usage = ma_aaudio_usage_game;
+	deviceConfig.wasapi.noAutoConvertSRC = true;
+
+	deviceConfig.dataCallback = [](ma_device* device, void* out, const void* input, ma_uint32 frameCount) {
+		auto self = reinterpret_cast<MiniAudioDevice*>(device->pUserData);
+		s16* output = reinterpret_cast<ma_int16*>(out);
+
+		self->samples->pop(output, frameCount);
+	};
+
+	if (ma_device_init(&context, &deviceConfig, &device) != MA_SUCCESS) {
+		Helpers::warn("Unable to initialize audio device");
+		initialized = false;
+		return;
+	}
+
+	initialized = true;
+	start();
+}
+
+void MiniAudioDevice::start() {
+	if (!initialized) {
+		Helpers::warn("MiniAudio device not initialize, won't start");
+		return;
+	}
+
+	if (ma_device_start(&device) == MA_SUCCESS) {
+		running = true;
+	} else {
+		running = false;
+		Helpers::warn("Failed to start audio device");
+	}
+}

src/core/audio/teakra_core.cpp

@@ -6,6 +6,10 @@
 #include "services/dsp.hpp"
 
 using namespace Audio;
+static constexpr u32 sampleRate = 32768;
+static constexpr u32 duration = 30;
+static s16 samples[sampleRate * duration * 2];
+static uint sampleIndex = 0;
 
 struct Dsp1 {
 	// All sizes are in bytes unless otherwise specified
@@ -51,10 +55,7 @@ TeakraDSP::TeakraDSP(Memory& mem, Scheduler& scheduler, DSPService& dspService)
 	ahbm.write32 = [&](u32 addr, u32 value) { *(u32*)&mem.getFCRAM()[addr - PhysicalAddrs::FCRAM] = value; };
 
 	teakra.SetAHBMCallback(ahbm);
-	teakra.SetAudioCallback([=](std::array<s16, 2> sample) {
-		//printf("%d %d\n", sample[0], sample[1]);
-		// NOP for now
-	});
+	teakra.SetAudioCallback([=](std::array<s16, 2> sample) { sampleBuffer.push(sample.data(), 2); });
 
 	// Set up event handlers. These handlers forward a hardware interrupt to the DSP service, which is responsible
 	// For triggering the appropriate DSP kernel events

src/emulator.cpp

@@ -25,10 +25,11 @@ Emulator::Emulator()
 #endif
 {
 	DSPService& dspService = kernel.getServiceManager().getDSP();
-
 	dsp = Audio::makeDSPCore(config.dspType, memory, scheduler, dspService);
 	dspService.setDSPCore(dsp.get());
 
+	audioDevice.init(dsp->getSamples());
+
 #ifdef PANDA3DS_ENABLE_DISCORD_RPC
 	if (config.discordRpcEnabled) {
 		discordRpc.init();

src/miniaudio.cpp

@@ -0,0 +1,7 @@
+// We do not need the ability to be able to encode or decode audio files for the time being
+// So we disable said functionality to make the executable smaller
+#define MA_NO_DECODING
+#define MA_NO_ENCODING
+#define MINIAUDIO_IMPLEMENTATION
+
+#include "miniaudio.h"