Fix no audio on zero latency bug. make Xaudio consistent with other APIs

src/Cafe/HW/Latte/Core/LatteShaderCache.cpp

@@ -833,12 +833,15 @@ void LatteShaderCache_StreamBootSound()
 	try
 	{
 		bootSndAudioDev = IAudioAPI::CreateDeviceFromConfig(true, 48000, 2, samplesPerBlock, 16);
+		if(!bootSndAudioDev)
+			return;
 	}
 	catch (const std::runtime_error& ex)
 	{
 		cemuLog_log(LogType::Force, "Failed to initialise audio device for bootup sound");
 		return;
 	}
+	bootSndAudioDev->SetAudioDelayOverride(4);
 	bootSndAudioDev->Play();
 
 	std::string sndPath = fmt::format("{}/meta/{}", CafeSystem::GetMlcStoragePath(CafeSystem::GetForegroundTitleId()), "bootSound.btsnd");
@@ -853,10 +856,10 @@ void LatteShaderCache_StreamBootSound()
 	{
 		while(audiothread_keeprunning)
 		{
-			if (bootSndAudioDev->NeedAdditionalBlocks())
+			while (bootSndAudioDev->NeedAdditionalBlocks())
 				bootSndAudioDev->FeedBlock(bootSndFileReader->getSamples());
-			// sleep for half the duration of a single block
-			std::this_thread::sleep_for(std::chrono::milliseconds(samplesPerBlock / (48'000/ 1'000) / 2));
+			// sleep for the duration of a single block
+			std::this_thread::sleep_for(std::chrono::milliseconds(samplesPerBlock / (48'000/ 1'000)));
 		}
 	}
 

src/audio/CubebAPI.cpp

@@ -114,7 +114,7 @@ CubebAPI::~CubebAPI()
 bool CubebAPI::NeedAdditionalBlocks() const
 {
 	std::shared_lock lock(m_mutex);
-	return m_buffer.size() < s_audioDelay * m_bytesPerBlock;
+	return m_buffer.size() < GetAudioDelay() * m_bytesPerBlock;
 }
 
 bool CubebAPI::FeedBlock(sint16* data)

src/audio/DirectSoundAPI.cpp

@@ -210,7 +210,7 @@ void DirectSoundAPI::SetVolume(sint32 volume)
 bool DirectSoundAPI::NeedAdditionalBlocks() const
 {
 	std::shared_lock lock(m_mutex);
-	return m_buffer.size() < s_audioDelay;
+	return m_buffer.size() < GetAudioDelay();
 }
 
 std::vector<DirectSoundAPI::DeviceDescriptionPtr> DirectSoundAPI::GetDevices()

src/audio/IAudioAPI.cpp

@@ -200,3 +200,12 @@ std::vector<IAudioAPI::DeviceDescriptionPtr> IAudioAPI::GetDevices(AudioAPI api)
 	}
 }
 
+void IAudioAPI::SetAudioDelayOverride(uint32 delay)
+{
+	m_audioDelayOverride = delay;
+}
+
+uint32 IAudioAPI::GetAudioDelay() const
+{
+	return m_audioDelayOverride > 0 ? m_audioDelayOverride : s_audioDelay;
+}

src/audio/IAudioAPI.h

@@ -55,6 +55,8 @@ class IAudioAPI
 	virtual bool FeedBlock(sint16* data) = 0;
 	virtual bool Play() = 0;
 	virtual bool Stop() = 0;
+	void SetAudioDelayOverride(uint32 delay);
+	uint32 GetAudioDelay() const;
 
 	static void PrintLogging();
 	static void InitializeStatic();
@@ -77,9 +79,10 @@ class IAudioAPI
 	bool m_playing = false;
 
 	static std::array<bool, AudioAPIEnd> s_availableApis;
-	static uint32 s_audioDelay;
+	uint32 m_audioDelayOverride = 0;
 
 private:
+	static uint32 s_audioDelay;
 	void InitWFX(sint32 samplerate, sint32 channels, sint32 bits_per_sample);
 
 };

src/audio/XAudio27API.cpp

@@ -33,8 +33,8 @@ XAudio27API::XAudio27API(uint32 device_id, uint32 samplerate, uint32 channels, u
 	m_wfx.Format.nChannels = channels;
 	m_wfx.Format.nSamplesPerSec = samplerate;
 	m_wfx.Format.wBitsPerSample = bits_per_sample;
-	m_wfx.Format.nBlockAlign = (m_wfx.Format.nChannels * m_wfx.Format.wBitsPerSample) / 8; // must equal (nChannels × wBitsPerSample) / 8
-	m_wfx.Format.nAvgBytesPerSec = m_wfx.Format.nSamplesPerSec * m_wfx.Format.nBlockAlign; // must equal nSamplesPerSec × nBlockAlign.
+	m_wfx.Format.nBlockAlign = (m_wfx.Format.nChannels * m_wfx.Format.wBitsPerSample) / 8; // must equal (nChannels � wBitsPerSample) / 8
+	m_wfx.Format.nAvgBytesPerSec = m_wfx.Format.nSamplesPerSec * m_wfx.Format.nBlockAlign; // must equal nSamplesPerSec � nBlockAlign.
 	m_wfx.Format.cbSize = sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 
 	m_wfx.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
@@ -199,9 +199,7 @@ bool XAudio27API::FeedBlock(sint16* data)
 	// check if we queued too many blocks
 	if(m_blocks_queued >= kBlockCount)
 	{
-		XAUDIO2_VOICE_STATE state{};
-		m_source_voice->GetState(&state);
-		m_blocks_queued = state.BuffersQueued;
+		m_blocks_queued = GetQueuedBuffers();
 
 		if (m_blocks_queued >= kBlockCount)
 		{
@@ -222,7 +220,14 @@ bool XAudio27API::FeedBlock(sint16* data)
 	return true;
 }
 
+uint32 XAudio27API::GetQueuedBuffers() const
+{
+	XAUDIO2_VOICE_STATE state{};
+	m_source_voice->GetState(&state);
+	return state.BuffersQueued;
+}
+
 bool XAudio27API::NeedAdditionalBlocks() const
 {
-	return m_blocks_queued < s_audioDelay;
+	return GetQueuedBuffers() < GetAudioDelay();
 }

src/audio/XAudio27API.h

@@ -47,6 +47,8 @@ class XAudio27API : public IAudioAPI
 	static std::vector<DeviceDescriptionPtr> GetDevices();
 
 private:
+	uint32 GetQueuedBuffers() const;
+
 	struct XAudioDeleter
 	{
 		void operator()(IXAudio2* ptr) const;

src/audio/XAudio2API.cpp

@@ -270,9 +270,7 @@ bool XAudio2API::FeedBlock(sint16* data)
 	// check if we queued too many blocks
 	if (m_blocks_queued >= kBlockCount)
 	{
-		XAUDIO2_VOICE_STATE state{};
-		m_source_voice->GetState(&state);
-		m_blocks_queued = state.BuffersQueued;
+		m_blocks_queued = GetQueuedBuffers();
 
 		if (m_blocks_queued >= kBlockCount)
 		{
@@ -293,7 +291,14 @@ bool XAudio2API::FeedBlock(sint16* data)
 	return true;
 }
 
+uint32 XAudio2API::GetQueuedBuffers() const
+{
+	XAUDIO2_VOICE_STATE state{};
+	m_source_voice->GetState(&state);
+	return state.BuffersQueued;
+}
+
 bool XAudio2API::NeedAdditionalBlocks() const
 {
-	return m_blocks_queued < s_audioDelay;
+	return GetQueuedBuffers() < GetAudioDelay();
 }

src/audio/XAudio2API.h

@@ -46,6 +46,8 @@ class XAudio2API : public IAudioAPI
 	static const std::vector<DeviceDescriptionPtr>& GetDevices() { return s_devices;	}
 
 private:
+	uint32 GetQueuedBuffers() const;
+
 	static const std::vector<DeviceDescriptionPtr>& RefreshDevices();
 
 	struct XAudioDeleter