Merge remote repo native into ext/native/.

ext/native/android/native-audio-so.cpp

@@ -0,0 +1,190 @@
+// Minimal audio streaming using OpenSL.
+//
+// Loosely based on the Android NDK sample code.
+
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+
+// for native audio
+#include <SLES/OpenSLES.h>
+#include <SLES/OpenSLES_Android.h>
+
+#include "../base/logging.h"
+#include "native-audio-so.h"
+
+// This is kinda ugly, but for simplicity I've left these as globals just like in the sample,
+// as there's not really any use case for this where we have multiple audio devices yet.
+
+// engine interfaces
+static SLObjectItf engineObject;
+static SLEngineItf engineEngine;
+static SLObjectItf outputMixObject;
+
+// buffer queue player interfaces
+static SLObjectItf bqPlayerObject = NULL;
+static SLPlayItf bqPlayerPlay;
+static SLAndroidSimpleBufferQueueItf bqPlayerBufferQueue;
+static SLMuteSoloItf bqPlayerMuteSolo;
+static SLVolumeItf bqPlayerVolume;
+
+// Double buffering.
+static short *buffer[2];
+static int curBuffer = 0;
+static int framesPerBuffer;
+int sampleRate;
+
+static AndroidAudioCallback audioCallback;
+
+// This callback handler is called every time a buffer finishes playing.
+// The documentation available is very unclear about how to best manage buffers.
+// I've chosen to this approach: Instantly enqueue a buffer that was rendered to the last time,
+// and then render the next. Hopefully it's okay to spend time in this callback after having enqueued. 
+static void bqPlayerCallback(SLAndroidSimpleBufferQueueItf bq, void *context) {
+	if (bq != bqPlayerBufferQueue) {
+		ELOG("Wrong bq!");
+		return;
+	}
+
+	int renderedFrames = audioCallback(buffer[curBuffer], framesPerBuffer);
+
+	int sizeInBytes = framesPerBuffer * 2 * sizeof(short);
+	int byteCount = (framesPerBuffer - renderedFrames) * 4;
+	if (byteCount > 0) {
+		memset(buffer[curBuffer] + renderedFrames * 2, 0, byteCount);
+	}
+	SLresult result = (*bqPlayerBufferQueue)->Enqueue(bqPlayerBufferQueue, buffer[curBuffer], sizeInBytes);
+
+	// Comment from sample code:
+	// the most likely other result is SL_RESULT_BUFFER_INSUFFICIENT,
+	// which for this code example would indicate a programming error
+	if (result != SL_RESULT_SUCCESS) {
+		ELOG("OpenSL ES: Failed to enqueue! %i %i", renderedFrames, sizeInBytes);
+	}
+
+	curBuffer ^= 1;	// Switch buffer
+}
+
+// create the engine and output mix objects
+bool OpenSLWrap_Init(AndroidAudioCallback cb, int _FramesPerBuffer, int _SampleRate) {
+	audioCallback = cb;
+	framesPerBuffer = _FramesPerBuffer;
+	if (framesPerBuffer == 0)
+		framesPerBuffer = 256;
+	if (framesPerBuffer < 32)
+		framesPerBuffer = 32;
+	sampleRate = _SampleRate;
+	if (sampleRate != 44100 && sampleRate != 48000) {
+		ELOG("Invalid sample rate %i - choosing 44100", sampleRate);
+		sampleRate = 44100;
+	}
+
+	buffer[0] = new short[framesPerBuffer * 2];
+	buffer[1] = new short[framesPerBuffer * 2];
+
+	SLresult result;
+	// create engine
+	result = slCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineEngine);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*engineEngine)->CreateOutputMix(engineEngine, &outputMixObject, 0, 0, 0);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*outputMixObject)->Realize(outputMixObject, SL_BOOLEAN_FALSE);
+	assert(SL_RESULT_SUCCESS == result);
+
+	SLuint32 sr = SL_SAMPLINGRATE_44_1;
+	if (sampleRate == 48000) {
+		sr = SL_SAMPLINGRATE_48;
+	}
+
+	SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2};
+	SLDataFormat_PCM format_pcm = {
+		SL_DATAFORMAT_PCM,
+		2,
+		sr,
+		SL_PCMSAMPLEFORMAT_FIXED_16,
+		SL_PCMSAMPLEFORMAT_FIXED_16,
+		SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT,
+		SL_BYTEORDER_LITTLEENDIAN
+	};
+
+	SLDataSource audioSrc = {&loc_bufq, &format_pcm};
+
+	// configure audio sink
+	SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, outputMixObject};
+	SLDataSink audioSnk = {&loc_outmix, NULL};
+
+	// create audio player
+	const SLInterfaceID ids[2] = {SL_IID_BUFFERQUEUE, SL_IID_VOLUME};
+	const SLboolean req[2] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
+	result = (*engineEngine)->CreateAudioPlayer(engineEngine, &bqPlayerObject, &audioSrc, &audioSnk, 2, ids, req);
+	assert(SL_RESULT_SUCCESS == result);
+
+	result = (*bqPlayerObject)->Realize(bqPlayerObject, SL_BOOLEAN_FALSE);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_PLAY, &bqPlayerPlay);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_BUFFERQUEUE,
+		&bqPlayerBufferQueue);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*bqPlayerBufferQueue)->RegisterCallback(bqPlayerBufferQueue, bqPlayerCallback, NULL);
+	assert(SL_RESULT_SUCCESS == result);
+	result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_VOLUME, &bqPlayerVolume);
+	assert(SL_RESULT_SUCCESS == result);
+	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?)
+	curBuffer = 0;
+	audioCallback(buffer[curBuffer], framesPerBuffer);
+
+	result = (*bqPlayerBufferQueue)->Enqueue(bqPlayerBufferQueue, buffer[curBuffer], sizeof(buffer[curBuffer]));
+	if (SL_RESULT_SUCCESS != result) {
+		return false;
+	}
+	curBuffer ^= 1;
+	return true;
+}
+
+// shut down the native audio system
+void OpenSLWrap_Shutdown() {
+	SLresult result;
+	ILOG("OpenSLWrap_Shutdown - stopping playback");
+	result = (*bqPlayerPlay)->SetPlayState(bqPlayerPlay, SL_PLAYSTATE_STOPPED);
+	if (SL_RESULT_SUCCESS != result) {
+		ELOG("SetPlayState failed");
+	}
+
+	ILOG("OpenSLWrap_Shutdown - deleting player object");
+
+	if (bqPlayerObject != NULL) {
+		(*bqPlayerObject)->Destroy(bqPlayerObject);
+		bqPlayerObject = NULL;
+		bqPlayerPlay = NULL;
+		bqPlayerBufferQueue = NULL;
+		bqPlayerMuteSolo = NULL;
+		bqPlayerVolume = NULL;
+	}
+
+	ILOG("OpenSLWrap_Shutdown - deleting mix object");
+
+	if (outputMixObject != NULL) {
+		(*outputMixObject)->Destroy(outputMixObject);
+		outputMixObject = NULL;
+	}
+
+	ILOG("OpenSLWrap_Shutdown - deleting engine object");
+
+	if (engineObject != NULL) {
+		(*engineObject)->Destroy(engineObject);
+		engineObject = NULL;
+		engineEngine = NULL;
+	}
+	delete [] buffer[0];
+	delete [] buffer[1];
+	ILOG("OpenSLWrap_Shutdown - finished");
+}	
+