Merge pull request #12333 from hrydgard/android-opensl-init-fix

Android OpenSL initial queue fix

android/jni/app-android.cpp

@@ -506,7 +506,7 @@ extern "C" void Java_org_ppsspp_ppsspp_NativeApp_audioInit(JNIEnv *, jclass) {
 
 	ILOG("NativeApp.audioInit() -- Using OpenSL audio! frames/buffer: %i	 optimal sr: %i	 actual sr: %i", optimalFramesPerBuffer, optimalSampleRate, sampleRate);
 	if (!g_audioState) {
-		g_audioState = AndroidAudio_Init(&NativeMix, library_path, framesPerBuffer, sampleRate);
+		g_audioState = AndroidAudio_Init(&NativeMix, framesPerBuffer, sampleRate);
 	} else {
 		ELOG("Audio state already initialized");
 	}

android/jni/native-audio-so.cpp

@@ -56,7 +56,9 @@ void OpenSLContext::BqPlayerCallback(SLAndroidSimpleBufferQueueItf bq) {
 		ELOG("OpenSL ES: Failed to enqueue! %i %i", renderedFrames, sizeInBytes);
 	}
 
-	curBuffer ^= 1;	// Switch buffer
+	curBuffer += 1; // Switch buffer
+	if (curBuffer == NUM_BUFFERS)
+		curBuffer = 0;
 }
 
 // create the engine and output mix objects
@@ -83,7 +85,7 @@ bool OpenSLContext::Init() {
 	// The constants, such as SL_SAMPLINGRATE_44_1, are just 44100000.
 	SLuint32 sr = (SLuint32)sampleRate * 1000;
 
-	SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2};
+	SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, NUM_BUFFERS};
 	SLDataFormat_PCM format_pcm = {
 		SL_DATAFORMAT_PCM,
 		2,
@@ -124,18 +126,20 @@ bool OpenSLContext::Init() {
 	result = (*bqPlayerPlay)->SetPlayState(bqPlayerPlay, SL_PLAYSTATE_PLAYING);
 	assert(SL_RESULT_SUCCESS == result);
 
-	// Render and enqueue a first buffer. (or should we just play the buffer empty?)
-	buffer[0] = new short[framesPerBuffer * 2];
-	buffer[1] = new short[framesPerBuffer * 2];
-
-	curBuffer = 0;
-	audioCallback(buffer[curBuffer], framesPerBuffer);
+	// Allocate and enqueue N empty buffers.
+	for (int i = 0; i < NUM_BUFFERS; i++) {
+		buffer[i] = new short[framesPerBuffer * 2]{};
+	}
 
-	result = (*bqPlayerBufferQueue)->Enqueue(bqPlayerBufferQueue, buffer[curBuffer], sizeof(buffer[curBuffer]));
-	if (SL_RESULT_SUCCESS != result) {
-		return false;
+	int sizeInBytes = framesPerBuffer * 2 * sizeof(short);
+	for (int i = 0; i < NUM_BUFFERS; i++) {
+		result = (*bqPlayerBufferQueue)->Enqueue(bqPlayerBufferQueue, buffer[i], sizeInBytes);
+		if (SL_RESULT_SUCCESS != result) {
+			return false;
+		}
 	}
-	curBuffer ^= 1;
+
+	curBuffer = 0;
 	return true;
 }
 
@@ -174,10 +178,11 @@ OpenSLContext::~OpenSLContext() {
 		engineObject = nullptr;
 		engineEngine = nullptr;
 	}
-	delete [] buffer[0];
-	delete [] buffer[1];
-	buffer[0] = nullptr;
-	buffer[1] = nullptr;
+
+	for (int i = 0; i < NUM_BUFFERS; i++) {
+		delete[] buffer[i];
+		buffer[i] = nullptr;
+	}
 	ILOG("OpenSLWrap_Shutdown - finished");
 }	
 

android/jni/native-audio-so.h

@@ -37,10 +37,15 @@ class OpenSLContext : public AudioContext {
 	SLAndroidSimpleBufferQueueItf bqPlayerBufferQueue = nullptr;
 	SLVolumeItf bqPlayerVolume = nullptr;
 
+	// Should be no reason to need more than two buffers, but make it clear in the code.
+	enum {
+		NUM_BUFFERS = 2,
+	};
+
 	// Double buffering.
-	short *buffer[2]{};
+	short *buffer[NUM_BUFFERS]{};
 	int curBuffer = 0;
 
 	static void bqPlayerCallbackWrap(SLAndroidSimpleBufferQueueItf bq, void *context);
 	void BqPlayerCallback(SLAndroidSimpleBufferQueueItf bq);
-};
+};

android/jni/native_audio.cpp

@@ -9,7 +9,7 @@ struct AndroidAudioState {
 	int sample_rate = 0;
 };
 
-AndroidAudioState *AndroidAudio_Init(AndroidAudioCallback callback, std::string libraryDir, int optimalFramesPerBuffer, int optimalSampleRate) {
+AndroidAudioState *AndroidAudio_Init(AndroidAudioCallback callback, int optimalFramesPerBuffer, int optimalSampleRate) {
 	AndroidAudioState *state = new AndroidAudioState();
 	state->callback = callback;
 	state->frames_per_buffer = optimalFramesPerBuffer ? optimalFramesPerBuffer : 256;

android/jni/native_audio.h

@@ -5,14 +5,8 @@
 
 struct AndroidAudioState;
 
-// This is the file you should include from your program. It dynamically loads
-// the native_audio.so shared object and sets up the function pointers.
-
-// Do not call this if you have detected that the android version is below
-// 2.2, as it will fail miserably.
-
 // It's okay for optimalFramesPerBuffer and optimalSampleRate to be 0. Defaults will be used.
-AndroidAudioState *AndroidAudio_Init(AndroidAudioCallback cb, std::string libraryDir, int optimalFramesPerBuffer, int optimalSampleRate);
+AndroidAudioState *AndroidAudio_Init(AndroidAudioCallback cb, int optimalFramesPerBuffer, int optimalSampleRate);
 bool AndroidAudio_Pause(AndroidAudioState *state);
 bool AndroidAudio_Resume(AndroidAudioState *state);
 bool AndroidAudio_Shutdown(AndroidAudioState *state);