tests/listening/slesTest_playMuteSolo.cpp - platform/frameworks/wilhelm - Git at Google

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <assert.h>
 #include <pthread.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/time.h>

 #include <SLES/OpenSLES.h>


 #define MAX_NUMBER_INTERFACES 3

 #define TEST_MUTE 0
 #define TEST_SOLO 1

 typedef struct {
     int testMode;
     SLPlayItf playItf;
     SLMuteSoloItf muteSoloItf;
 } Context;

 //-----------------------------------------------------------------
 /* Exits the application if an error is encountered */
 #define ExitOnError(x) ExitOnErrorFunc(x,__LINE__)

 void ExitOnErrorFunc( SLresult result , int line)
 {
     if (SL_RESULT_SUCCESS != result) {
         fprintf(stdout, "%u error code encountered at line %d, exiting\n", result, line);
         exit(EXIT_FAILURE);
     }
 }

 // These are extensions to OpenSL ES 1.0.1 values

 #define SL_PREFETCHSTATUS_UNKNOWN 0
 #define SL_PREFETCHSTATUS_ERROR   (-1)

 // Mutex and condition shared with main program to protect prefetch_status

 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
 SLuint32 prefetch_status = SL_PREFETCHSTATUS_UNKNOWN;

 /* used to detect errors likely to have occured when the OpenSL ES framework fails to open
  * a resource, for instance because a file URI is invalid, or an HTTP server doesn't respond.
  */
 #define PREFETCHEVENT_ERROR_CANDIDATE \
         (SL_PREFETCHEVENT_STATUSCHANGE | SL_PREFETCHEVENT_FILLLEVELCHANGE)

 // Prefetch status callback

 void prefetch_callback(SLPrefetchStatusItf caller, void *context, SLuint32 event)
 {
     SLresult result;
     assert(context == NULL);
     SLpermille level;
     result = (*caller)->GetFillLevel(caller, &level);
     assert(SL_RESULT_SUCCESS == result);
     SLuint32 status;
     result = (*caller)->GetPrefetchStatus(caller, &status);
     assert(SL_RESULT_SUCCESS == result);
     SLuint32 new_prefetch_status;
     if ((event & PREFETCHEVENT_ERROR_CANDIDATE) == PREFETCHEVENT_ERROR_CANDIDATE
             && level == 0 && status == SL_PREFETCHSTATUS_UNDERFLOW) {
         new_prefetch_status = SL_PREFETCHSTATUS_ERROR;
     } else if (event == SL_PREFETCHEVENT_STATUSCHANGE &&
             status == SL_PREFETCHSTATUS_SUFFICIENTDATA) {
         new_prefetch_status = status;
     } else {
         return;
     }
     int ok;
     ok = pthread_mutex_lock(&mutex);
     assert(ok == 0);
     prefetch_status = new_prefetch_status;
     ok = pthread_cond_signal(&cond);
     assert(ok == 0);
     ok = pthread_mutex_unlock(&mutex);
     assert(ok == 0);
 }

 //-----------------------------------------------------------------
 /* PlayItf callback for an audio player, will be called for every SL_PLAYEVENT_HEADATNEWPOS event */
 void PlayEventCallback( SLPlayItf caller,  void *pContext, SLuint32 event)
 {
     Context *context = (Context *) pContext;
     SLPlayItf playItf = context->playItf;
     SLMuteSoloItf muteSolo = context->muteSoloItf;
     SLuint8 numChannels = 0;
     SLresult res = (*muteSolo)->GetNumChannels(muteSolo, &numChannels); ExitOnError(res);
     //fprintf(stdout, "Content has %d channel(s)\n", numChannels);
     SLmillisecond position;
     res = (*playItf)->GetPosition(playItf, &position); ExitOnError(res);
     printf("position=%u\n", (unsigned) position);

     switch (context->testMode) {
         case TEST_MUTE: {
             //---------------------------------------------------
             if (numChannels > 1) { // SLMuteSoloItf only works if more than one channel
                 SLboolean leftMuted = SL_BOOLEAN_TRUE;
                 res = (*muteSolo)->GetChannelMute(muteSolo, 0, &leftMuted); ExitOnError(res);
                 // swap channel mute
                 res = (*muteSolo)->SetChannelMute(muteSolo, 0,
                        leftMuted == SL_BOOLEAN_TRUE ? SL_BOOLEAN_FALSE : SL_BOOLEAN_TRUE);
                 ExitOnError(res);
                 res = (*muteSolo)->SetChannelMute(muteSolo, 1,
                        leftMuted == SL_BOOLEAN_TRUE ? SL_BOOLEAN_TRUE : SL_BOOLEAN_FALSE);
                 ExitOnError(res);
                 if (leftMuted == SL_BOOLEAN_TRUE) { // we've swapped the channel mute above
                     fprintf(stdout, "channel 0: playing, channel 1: muted\n");
                 } else {
                     fprintf(stdout, "channel 0: muted, channel 1: playing\n");
                 }
             }
             } break;

         case TEST_SOLO: {
             //---------------------------------------------------
             if (numChannels > 1) { // SLMuteSoloItf only works if more than one channel
                 SLboolean leftSoloed = SL_BOOLEAN_TRUE;
                 res = (*muteSolo)->GetChannelSolo(muteSolo, 0, &leftSoloed); ExitOnError(res);
                 // swap channel solo
                 res = (*muteSolo)->SetChannelSolo(muteSolo, 0,
                         leftSoloed == SL_BOOLEAN_TRUE ? SL_BOOLEAN_FALSE : SL_BOOLEAN_TRUE);
                 ExitOnError(res);
                 res = (*muteSolo)->SetChannelSolo(muteSolo, 1,
                         leftSoloed == SL_BOOLEAN_TRUE ? SL_BOOLEAN_TRUE : SL_BOOLEAN_FALSE);
                 ExitOnError(res);
                 if (leftSoloed == SL_BOOLEAN_TRUE) { // we've swapped the channel solo above
                     fprintf(stdout, "channel 0: normal, channel 1: soloed\n");
                 } else {
                     fprintf(stdout, "channel 0: soloed, channel 1: normal\n");
                 }
             }
             } break;

         default:
             break;
     }
 }

 //-----------------------------------------------------------------

 /* Play an audio URIs, mute and solo channels  */
 void TestPlayUri( SLObjectItf sl, const char* path)
 {
     SLresult  result;
     SLEngineItf EngineItf;

     /* Objects this application uses: one player and an output mix */
     SLObjectItf  player, outputMix;

     /* Source of audio data to play */
     SLDataSource      audioSource;
     SLDataLocator_URI uri;
     SLDataFormat_MIME mime;

     /* Data sinks for the audio player */
     SLDataSink               audioSink;
     SLDataLocator_OutputMix  locator_outputmix;

     /* Play, Volume and PrefetchStatus interfaces for the audio player */
     SLPlayItf           playItf;
     SLMuteSoloItf       muteSoloItf;
     SLPrefetchStatusItf prefetchItf;

     SLboolean required[MAX_NUMBER_INTERFACES];
     SLInterfaceID iidArray[MAX_NUMBER_INTERFACES];

     /* Get the SL Engine Interface which is implicit */
     result = (*sl)->GetInterface(sl, SL_IID_ENGINE, (void*)&EngineItf);
     ExitOnError(result);

     /* Initialize arrays required[] and iidArray[] */
     for (int i=0 ; i < MAX_NUMBER_INTERFACES ; i++) {
         required[i] = SL_BOOLEAN_FALSE;
         iidArray[i] = SL_IID_NULL;
     }

     /* ------------------------------------------------------ */
     /* Configuration of the output mix  */

     /* Create Output Mix object to be used by the player */
      result = (*EngineItf)->CreateOutputMix(EngineItf, &outputMix, 0, iidArray, required);
      ExitOnError(result);

     /* Realize the Output Mix object in synchronous mode */
     result = (*outputMix)->Realize(outputMix, SL_BOOLEAN_FALSE);
     ExitOnError(result);

     /* Setup the data sink structure */
     locator_outputmix.locatorType = SL_DATALOCATOR_OUTPUTMIX;
     locator_outputmix.outputMix   = outputMix;
     audioSink.pLocator            = (void*)&locator_outputmix;
     audioSink.pFormat             = NULL;

     /* ------------------------------------------------------ */
     /* Configuration of the player  */

     /* Set arrays required[] and iidArray[] for SLMuteSoloItf and SLPrefetchStatusItf interfaces */
     /*  (SLPlayItf is implicit) */
     required[0] = SL_BOOLEAN_TRUE;
     iidArray[0] = SL_IID_MUTESOLO;
     required[1] = SL_BOOLEAN_TRUE;
     iidArray[1] = SL_IID_PREFETCHSTATUS;

     /* Setup the data source structure for the URI */
     uri.locatorType = SL_DATALOCATOR_URI;
     uri.URI         =  (SLchar*) path;
     mime.formatType = SL_DATAFORMAT_MIME;
     /*     this is how ignored mime information is specified, according to OpenSL ES spec
      *     in 9.1.6 SLDataFormat_MIME and 8.23 SLMetadataTraversalItf GetChildInfo */
     mime.mimeType      = (SLchar*)NULL;
     mime.containerType = SL_CONTAINERTYPE_UNSPECIFIED;

     audioSource.pFormat  = (void*)&mime;
     audioSource.pLocator = (void*)&uri;

     /* Create the audio player */
     result = (*EngineItf)->CreateAudioPlayer(EngineItf, &player, &audioSource, &audioSink, 2,
             iidArray, required);
     ExitOnError(result);

     /* Realize the player in synchronous mode. */
     result = (*player)->Realize(player, SL_BOOLEAN_FALSE); ExitOnError(result);
     fprintf(stdout, "URI example: after Realize\n");

     /* Get the SLPlayItf, SLPrefetchStatusItf and SLMuteSoloItf interfaces for the player */
     result = (*player)->GetInterface(player, SL_IID_PLAY, (void*)&playItf);
     ExitOnError(result);

     // get the prefetch status interface
     result = (*player)->GetInterface(player, SL_IID_PREFETCHSTATUS, (void*)&prefetchItf);
     ExitOnError(result);

     // enable prefetch status callbacks
     result = (*prefetchItf)->RegisterCallback(prefetchItf, prefetch_callback, NULL);
     assert(SL_RESULT_SUCCESS == result);
     result = (*prefetchItf)->SetCallbackEventsMask(prefetchItf,
             SL_PREFETCHEVENT_STATUSCHANGE | SL_PREFETCHEVENT_FILLLEVELCHANGE);
     assert(SL_RESULT_SUCCESS == result);

     // get the mute solo interface
     result = (*player)->GetInterface(player, SL_IID_MUTESOLO, (void*)&muteSoloItf);
     ExitOnError(result);

     // Attempt to get the duration before it is necessarily known.
     // This should always return successfully.
     // The reported duration may be either
     // a particular duration or SL_TIME_UNKNOWN, depending on the platform.
     SLmillisecond duration;
     result = (*playItf)->GetDuration(playItf, &duration);
     ExitOnError(result);
     printf("GetDuration after Realize but before pre-fetch: result=%u, duration=%u\n",
         result, duration);

     // Attempt to get the channel count before it is necessarily known.
     // This should either return successfully with a specific value (e.g. 1 or 2),
     // or return zero, depending on whether the channel count is known yet.
     SLuint8 numChannels = 123;
     result = (*muteSoloItf)->GetNumChannels(muteSoloItf, &numChannels);
     printf("GetNumChannels after Realize but before pre-fetch: result=%u, numChannels=%u\n",
         result, numChannels);
     if (result != SL_RESULT_PRECONDITIONS_VIOLATED) {
         ExitOnError(result);
     } else {
         printf("Warning: returning SL_RESULT_PRECONDITIONS_VIOLATED for unknown channel count is "
                 "obsolete; now it should return SL_RESULT_SUCCESS and zero count if unknown\n");
     }

     /* Initialize a context for use by the play event callback */
     Context             context;
     context.playItf = playItf;
     context.muteSoloItf = muteSoloItf;
     context.testMode = TEST_MUTE;

     /*  Setup to receive playback events on position updates */
     result = (*playItf)->RegisterCallback(playItf, PlayEventCallback, (void *) &context);
     ExitOnError(result);
     result = (*playItf)->SetCallbackEventsMask(playItf, SL_PLAYEVENT_HEADATNEWPOS);
     ExitOnError(result);
     result = (*playItf)->SetPositionUpdatePeriod(playItf, 1000);
     ExitOnError(result);

     fprintf(stdout, "Player configured\n");

     /* ------------------------------------------------------ */
     /* Playback and test */

     /* Start the data prefetching by setting the player to the paused state */
     result = (*playItf)->SetPlayState( playItf, SL_PLAYSTATE_PAUSED );
     ExitOnError(result);

     // wait for prefetch status callback to indicate either sufficient data or error
     pthread_mutex_lock(&mutex);
     while (prefetch_status == SL_PREFETCHSTATUS_UNKNOWN) {
         pthread_cond_wait(&cond, &mutex);
     }
     pthread_mutex_unlock(&mutex);
     if (prefetch_status == SL_PREFETCHSTATUS_ERROR) {
         fprintf(stderr, "Error during prefetch, exiting\n");
         goto destroyKillKill;
     }

     /* Query the duration */
     result = (*playItf)->GetDuration(playItf, &duration);
     printf("GetDuration after Realize and after pre-fetch: result=%u, duration=%u\n",
         result, duration);
     ExitOnError(result);

     /* Query the number of channels */
     numChannels = 123;
     result = (*muteSoloItf)->GetNumChannels(muteSoloItf, &numChannels);
     printf("GetNumChannels after Realize and after pre-fetch: result=%u, numChannels=%u\n",
         result, numChannels);
     ExitOnError(result);
     fprintf(stdout, "Content has %d channel(s)\n", numChannels);

     if (numChannels == 1) {
         fprintf(stdout, "SLMuteSolotItf only works one content with more than one channel. Bye\n");
         goto destroyKillKill;
     } else {
         /* Mute left channel */
         result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 0, SL_BOOLEAN_TRUE);
         ExitOnError(result);
         result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 1, SL_BOOLEAN_FALSE);
         ExitOnError(result);
     }

     /* Run the test for 10s */
     /* see PlayEventCallback() for more of the test of the SLMuteSoloItf interface */
     fprintf(stdout, "\nTesting mute functionality:\n");
     context.testMode = TEST_MUTE;
     result = (*playItf)->SetPlayState( playItf, SL_PLAYSTATE_PLAYING ); ExitOnError(result);
     usleep( 5 * 1000 * 1000);
     result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 0, SL_BOOLEAN_FALSE); ExitOnError(result);
     result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 1, SL_BOOLEAN_FALSE); ExitOnError(result);
     fprintf(stdout, "\nTesting solo functionality:\n");
     context.testMode = TEST_SOLO;
     usleep( 5 * 1000 * 1000);

     /* Make sure player is stopped */
     fprintf(stdout, "Stopping playback\n");
     result = (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_STOPPED);
     ExitOnError(result);

 destroyKillKill:

     /* Destroy the players */
     (*player)->Destroy(player);

     /* Destroy Output Mix object */
     (*outputMix)->Destroy(outputMix);
 }

 //-----------------------------------------------------------------
 int main(int argc, char* const argv[])
 {
     SLresult    result;
     SLObjectItf sl;

     fprintf(stdout, "OpenSL ES test %s: exercises SLPlayItf, SLVolumeItf, SLMuteSoloItf\n",
             argv[0]);
     fprintf(stdout, "and AudioPlayer with SLDataLocator_URI source / OutputMix sink\n");
     fprintf(stdout, "Plays a sound and alternates the muting of the channels (for 5s).\n");
     fprintf(stdout, " and then alternates the solo\'ing of the channels (for 5s).\n");
     fprintf(stdout, "Stops after 10s\n");

     if (argc == 1) {
         fprintf(stdout, "Usage: \t%s url\n", argv[0]);
         fprintf(stdout, "Example: \"%s /sdcard/my.mp3\"\n", argv[0]);
         exit(EXIT_FAILURE);
     }

     SLEngineOption EngineOption[] = {
             {(SLuint32) SL_ENGINEOPTION_THREADSAFE, (SLuint32) SL_BOOLEAN_TRUE}
     };

     result = slCreateEngine( &sl, 1, EngineOption, 0, NULL, NULL);
     ExitOnError(result);

     /* Realizing the SL Engine in synchronous mode. */
     result = (*sl)->Realize(sl, SL_BOOLEAN_FALSE);
     ExitOnError(result);

     if (argc > 1) {
         TestPlayUri(sl, argv[1]);
     }

     /* Shutdown OpenSL ES */
     (*sl)->Destroy(sl);

     return EXIT_SUCCESS;
 }
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <assert.h>
	#include <pthread.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/time.h>

	#include <SLES/OpenSLES.h>


	#define MAX_NUMBER_INTERFACES 3

	#define TEST_MUTE 0
	#define TEST_SOLO 1

	typedef struct {
	int testMode;
	SLPlayItf playItf;
	SLMuteSoloItf muteSoloItf;
	} Context;

	//-----------------------------------------------------------------
	/* Exits the application if an error is encountered */
	#define ExitOnError(x) ExitOnErrorFunc(x,__LINE__)

	void ExitOnErrorFunc( SLresult result , int line)
	{
	if (SL_RESULT_SUCCESS != result) {
	fprintf(stdout, "%u error code encountered at line %d, exiting\n", result, line);
	exit(EXIT_FAILURE);
	}
	}

	// These are extensions to OpenSL ES 1.0.1 values

	#define SL_PREFETCHSTATUS_UNKNOWN 0
	#define SL_PREFETCHSTATUS_ERROR (-1)

	// Mutex and condition shared with main program to protect prefetch_status

	static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
	static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
	SLuint32 prefetch_status = SL_PREFETCHSTATUS_UNKNOWN;

	/* used to detect errors likely to have occured when the OpenSL ES framework fails to open
	* a resource, for instance because a file URI is invalid, or an HTTP server doesn't respond.
	*/
	#define PREFETCHEVENT_ERROR_CANDIDATE \
	(SL_PREFETCHEVENT_STATUSCHANGE \| SL_PREFETCHEVENT_FILLLEVELCHANGE)

	// Prefetch status callback

	void prefetch_callback(SLPrefetchStatusItf caller, void *context, SLuint32 event)
	{
	SLresult result;
	assert(context == NULL);
	SLpermille level;
	result = (*caller)->GetFillLevel(caller, &level);
	assert(SL_RESULT_SUCCESS == result);
	SLuint32 status;
	result = (*caller)->GetPrefetchStatus(caller, &status);
	assert(SL_RESULT_SUCCESS == result);
	SLuint32 new_prefetch_status;
	if ((event & PREFETCHEVENT_ERROR_CANDIDATE) == PREFETCHEVENT_ERROR_CANDIDATE
	&& level == 0 && status == SL_PREFETCHSTATUS_UNDERFLOW) {
	new_prefetch_status = SL_PREFETCHSTATUS_ERROR;
	} else if (event == SL_PREFETCHEVENT_STATUSCHANGE &&
	status == SL_PREFETCHSTATUS_SUFFICIENTDATA) {
	new_prefetch_status = status;
	} else {
	return;
	}
	int ok;
	ok = pthread_mutex_lock(&mutex);
	assert(ok == 0);
	prefetch_status = new_prefetch_status;
	ok = pthread_cond_signal(&cond);
	assert(ok == 0);
	ok = pthread_mutex_unlock(&mutex);
	assert(ok == 0);
	}

	//-----------------------------------------------------------------
	/* PlayItf callback for an audio player, will be called for every SL_PLAYEVENT_HEADATNEWPOS event */
	void PlayEventCallback( SLPlayItf caller, void *pContext, SLuint32 event)
	{
	Context context = (Context ) pContext;
	SLPlayItf playItf = context->playItf;
	SLMuteSoloItf muteSolo = context->muteSoloItf;
	SLuint8 numChannels = 0;
	SLresult res = (*muteSolo)->GetNumChannels(muteSolo, &numChannels); ExitOnError(res);
	//fprintf(stdout, "Content has %d channel(s)\n", numChannels);
	SLmillisecond position;
	res = (*playItf)->GetPosition(playItf, &position); ExitOnError(res);
	printf("position=%u\n", (unsigned) position);

	switch (context->testMode) {
	case TEST_MUTE: {
	//---------------------------------------------------
	if (numChannels > 1) { // SLMuteSoloItf only works if more than one channel
	SLboolean leftMuted = SL_BOOLEAN_TRUE;
	res = (*muteSolo)->GetChannelMute(muteSolo, 0, &leftMuted); ExitOnError(res);
	// swap channel mute
	res = (*muteSolo)->SetChannelMute(muteSolo, 0,
	leftMuted == SL_BOOLEAN_TRUE ? SL_BOOLEAN_FALSE : SL_BOOLEAN_TRUE);
	ExitOnError(res);
	res = (*muteSolo)->SetChannelMute(muteSolo, 1,
	leftMuted == SL_BOOLEAN_TRUE ? SL_BOOLEAN_TRUE : SL_BOOLEAN_FALSE);
	ExitOnError(res);
	if (leftMuted == SL_BOOLEAN_TRUE) { // we've swapped the channel mute above
	fprintf(stdout, "channel 0: playing, channel 1: muted\n");
	} else {
	fprintf(stdout, "channel 0: muted, channel 1: playing\n");
	}
	}
	} break;

	case TEST_SOLO: {
	//---------------------------------------------------
	if (numChannels > 1) { // SLMuteSoloItf only works if more than one channel
	SLboolean leftSoloed = SL_BOOLEAN_TRUE;
	res = (*muteSolo)->GetChannelSolo(muteSolo, 0, &leftSoloed); ExitOnError(res);
	// swap channel solo
	res = (*muteSolo)->SetChannelSolo(muteSolo, 0,
	leftSoloed == SL_BOOLEAN_TRUE ? SL_BOOLEAN_FALSE : SL_BOOLEAN_TRUE);
	ExitOnError(res);
	res = (*muteSolo)->SetChannelSolo(muteSolo, 1,
	leftSoloed == SL_BOOLEAN_TRUE ? SL_BOOLEAN_TRUE : SL_BOOLEAN_FALSE);
	ExitOnError(res);
	if (leftSoloed == SL_BOOLEAN_TRUE) { // we've swapped the channel solo above
	fprintf(stdout, "channel 0: normal, channel 1: soloed\n");
	} else {
	fprintf(stdout, "channel 0: soloed, channel 1: normal\n");
	}
	}
	} break;

	default:
	break;
	}
	}

	//-----------------------------------------------------------------

	/* Play an audio URIs, mute and solo channels */
	void TestPlayUri( SLObjectItf sl, const char* path)
	{
	SLresult result;
	SLEngineItf EngineItf;

	/* Objects this application uses: one player and an output mix */
	SLObjectItf player, outputMix;

	/* Source of audio data to play */
	SLDataSource audioSource;
	SLDataLocator_URI uri;
	SLDataFormat_MIME mime;

	/* Data sinks for the audio player */
	SLDataSink audioSink;
	SLDataLocator_OutputMix locator_outputmix;

	/* Play, Volume and PrefetchStatus interfaces for the audio player */
	SLPlayItf playItf;
	SLMuteSoloItf muteSoloItf;
	SLPrefetchStatusItf prefetchItf;

	SLboolean required[MAX_NUMBER_INTERFACES];
	SLInterfaceID iidArray[MAX_NUMBER_INTERFACES];

	/* Get the SL Engine Interface which is implicit */
	result = (sl)->GetInterface(sl, SL_IID_ENGINE, (void)&EngineItf);
	ExitOnError(result);

	/* Initialize arrays required[] and iidArray[] */
	for (int i=0 ; i < MAX_NUMBER_INTERFACES ; i++) {
	required[i] = SL_BOOLEAN_FALSE;
	iidArray[i] = SL_IID_NULL;
	}

	/* ------------------------------------------------------ */
	/* Configuration of the output mix */

	/* Create Output Mix object to be used by the player */
	result = (*EngineItf)->CreateOutputMix(EngineItf, &outputMix, 0, iidArray, required);
	ExitOnError(result);

	/* Realize the Output Mix object in synchronous mode */
	result = (*outputMix)->Realize(outputMix, SL_BOOLEAN_FALSE);
	ExitOnError(result);

	/* Setup the data sink structure */
	locator_outputmix.locatorType = SL_DATALOCATOR_OUTPUTMIX;
	locator_outputmix.outputMix = outputMix;
	audioSink.pLocator = (void*)&locator_outputmix;
	audioSink.pFormat = NULL;

	/* ------------------------------------------------------ */
	/* Configuration of the player */

	/* Set arrays required[] and iidArray[] for SLMuteSoloItf and SLPrefetchStatusItf interfaces */
	/* (SLPlayItf is implicit) */
	required[0] = SL_BOOLEAN_TRUE;
	iidArray[0] = SL_IID_MUTESOLO;
	required[1] = SL_BOOLEAN_TRUE;
	iidArray[1] = SL_IID_PREFETCHSTATUS;

	/* Setup the data source structure for the URI */
	uri.locatorType = SL_DATALOCATOR_URI;
	uri.URI = (SLchar*) path;
	mime.formatType = SL_DATAFORMAT_MIME;
	/* this is how ignored mime information is specified, according to OpenSL ES spec
	* in 9.1.6 SLDataFormat_MIME and 8.23 SLMetadataTraversalItf GetChildInfo */
	mime.mimeType = (SLchar*)NULL;
	mime.containerType = SL_CONTAINERTYPE_UNSPECIFIED;

	audioSource.pFormat = (void*)&mime;
	audioSource.pLocator = (void*)&uri;

	/* Create the audio player */
	result = (*EngineItf)->CreateAudioPlayer(EngineItf, &player, &audioSource, &audioSink, 2,
	iidArray, required);
	ExitOnError(result);

	/* Realize the player in synchronous mode. */
	result = (*player)->Realize(player, SL_BOOLEAN_FALSE); ExitOnError(result);
	fprintf(stdout, "URI example: after Realize\n");

	/* Get the SLPlayItf, SLPrefetchStatusItf and SLMuteSoloItf interfaces for the player */
	result = (player)->GetInterface(player, SL_IID_PLAY, (void)&playItf);
	ExitOnError(result);

	// get the prefetch status interface
	result = (player)->GetInterface(player, SL_IID_PREFETCHSTATUS, (void)&prefetchItf);
	ExitOnError(result);

	// enable prefetch status callbacks
	result = (*prefetchItf)->RegisterCallback(prefetchItf, prefetch_callback, NULL);
	assert(SL_RESULT_SUCCESS == result);
	result = (*prefetchItf)->SetCallbackEventsMask(prefetchItf,
	SL_PREFETCHEVENT_STATUSCHANGE \| SL_PREFETCHEVENT_FILLLEVELCHANGE);
	assert(SL_RESULT_SUCCESS == result);

	// get the mute solo interface
	result = (player)->GetInterface(player, SL_IID_MUTESOLO, (void)&muteSoloItf);
	ExitOnError(result);

	// Attempt to get the duration before it is necessarily known.
	// This should always return successfully.
	// The reported duration may be either
	// a particular duration or SL_TIME_UNKNOWN, depending on the platform.
	SLmillisecond duration;
	result = (*playItf)->GetDuration(playItf, &duration);
	ExitOnError(result);
	printf("GetDuration after Realize but before pre-fetch: result=%u, duration=%u\n",
	result, duration);

	// Attempt to get the channel count before it is necessarily known.
	// This should either return successfully with a specific value (e.g. 1 or 2),
	// or return zero, depending on whether the channel count is known yet.
	SLuint8 numChannels = 123;
	result = (*muteSoloItf)->GetNumChannels(muteSoloItf, &numChannels);
	printf("GetNumChannels after Realize but before pre-fetch: result=%u, numChannels=%u\n",
	result, numChannels);
	if (result != SL_RESULT_PRECONDITIONS_VIOLATED) {
	ExitOnError(result);
	} else {
	printf("Warning: returning SL_RESULT_PRECONDITIONS_VIOLATED for unknown channel count is "
	"obsolete; now it should return SL_RESULT_SUCCESS and zero count if unknown\n");
	}

	/* Initialize a context for use by the play event callback */
	Context context;
	context.playItf = playItf;
	context.muteSoloItf = muteSoloItf;
	context.testMode = TEST_MUTE;

	/* Setup to receive playback events on position updates */
	result = (playItf)->RegisterCallback(playItf, PlayEventCallback, (void ) &context);
	ExitOnError(result);
	result = (*playItf)->SetCallbackEventsMask(playItf, SL_PLAYEVENT_HEADATNEWPOS);
	ExitOnError(result);
	result = (*playItf)->SetPositionUpdatePeriod(playItf, 1000);
	ExitOnError(result);

	fprintf(stdout, "Player configured\n");

	/* ------------------------------------------------------ */
	/* Playback and test */

	/* Start the data prefetching by setting the player to the paused state */
	result = (*playItf)->SetPlayState( playItf, SL_PLAYSTATE_PAUSED );
	ExitOnError(result);

	// wait for prefetch status callback to indicate either sufficient data or error
	pthread_mutex_lock(&mutex);
	while (prefetch_status == SL_PREFETCHSTATUS_UNKNOWN) {
	pthread_cond_wait(&cond, &mutex);
	}
	pthread_mutex_unlock(&mutex);
	if (prefetch_status == SL_PREFETCHSTATUS_ERROR) {
	fprintf(stderr, "Error during prefetch, exiting\n");
	goto destroyKillKill;
	}

	/* Query the duration */
	result = (*playItf)->GetDuration(playItf, &duration);
	printf("GetDuration after Realize and after pre-fetch: result=%u, duration=%u\n",
	result, duration);
	ExitOnError(result);

	/* Query the number of channels */
	numChannels = 123;
	result = (*muteSoloItf)->GetNumChannels(muteSoloItf, &numChannels);
	printf("GetNumChannels after Realize and after pre-fetch: result=%u, numChannels=%u\n",
	result, numChannels);
	ExitOnError(result);
	fprintf(stdout, "Content has %d channel(s)\n", numChannels);

	if (numChannels == 1) {
	fprintf(stdout, "SLMuteSolotItf only works one content with more than one channel. Bye\n");
	goto destroyKillKill;
	} else {
	/* Mute left channel */
	result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 0, SL_BOOLEAN_TRUE);
	ExitOnError(result);
	result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 1, SL_BOOLEAN_FALSE);
	ExitOnError(result);
	}

	/* Run the test for 10s */
	/* see PlayEventCallback() for more of the test of the SLMuteSoloItf interface */
	fprintf(stdout, "\nTesting mute functionality:\n");
	context.testMode = TEST_MUTE;
	result = (*playItf)->SetPlayState( playItf, SL_PLAYSTATE_PLAYING ); ExitOnError(result);
	usleep( 5 * 1000 * 1000);
	result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 0, SL_BOOLEAN_FALSE); ExitOnError(result);
	result = (*muteSoloItf)->SetChannelMute(muteSoloItf, 1, SL_BOOLEAN_FALSE); ExitOnError(result);
	fprintf(stdout, "\nTesting solo functionality:\n");
	context.testMode = TEST_SOLO;
	usleep( 5 * 1000 * 1000);

	/* Make sure player is stopped */
	fprintf(stdout, "Stopping playback\n");
	result = (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_STOPPED);
	ExitOnError(result);

	destroyKillKill:

	/* Destroy the players */
	(*player)->Destroy(player);

	/* Destroy Output Mix object */
	(*outputMix)->Destroy(outputMix);
	}

	//-----------------------------------------------------------------
	int main(int argc, char* const argv[])
	{
	SLresult result;
	SLObjectItf sl;

	fprintf(stdout, "OpenSL ES test %s: exercises SLPlayItf, SLVolumeItf, SLMuteSoloItf\n",
	argv[0]);
	fprintf(stdout, "and AudioPlayer with SLDataLocator_URI source / OutputMix sink\n");
	fprintf(stdout, "Plays a sound and alternates the muting of the channels (for 5s).\n");
	fprintf(stdout, " and then alternates the solo\'ing of the channels (for 5s).\n");
	fprintf(stdout, "Stops after 10s\n");

	if (argc == 1) {
	fprintf(stdout, "Usage: \t%s url\n", argv[0]);
	fprintf(stdout, "Example: \"%s /sdcard/my.mp3\"\n", argv[0]);
	exit(EXIT_FAILURE);
	}

	SLEngineOption EngineOption[] = {
	{(SLuint32) SL_ENGINEOPTION_THREADSAFE, (SLuint32) SL_BOOLEAN_TRUE}
	};

	result = slCreateEngine( &sl, 1, EngineOption, 0, NULL, NULL);
	ExitOnError(result);

	/* Realizing the SL Engine in synchronous mode. */
	result = (*sl)->Realize(sl, SL_BOOLEAN_FALSE);
	ExitOnError(result);

	if (argc > 1) {
	TestPlayUri(sl, argv[1]);
	}

	/* Shutdown OpenSL ES */
	(*sl)->Destroy(sl);

	return EXIT_SUCCESS;
	}