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/*
* 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 REPETITIONS 4 // 4 repetitions, but will stop the looping before the end
#define INITIAL_RATE 2000 // 2x normal playback speed
// 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)
//-----------------------------------------------------------------
//* Exits the application if an error is encountered */
#define CheckErr(x) ExitOnErrorFunc(x,__LINE__)
void ExitOnErrorFunc( SLresult result , int line)
{
if (SL_RESULT_SUCCESS != result) {
fprintf(stderr, "%u error code encountered at line %d, exiting\n", result, line);
exit(EXIT_FAILURE);
}
}
//-----------------------------------------------------------------
/* PlayItf callback for an audio player */
void PlayEventCallback( SLPlayItf caller, void *pContext, SLuint32 event)
{
fprintf(stdout, "PlayEventCallback event = ");
if (event & SL_PLAYEVENT_HEADATEND) {
fprintf(stdout, "SL_PLAYEVENT_HEADATEND \n");
/* slow playback down by 2x for next loop, if possible */
SLpermille minRate, maxRate, stepSize, rate = 1000;
SLuint32 capa;
assert(NULL != pContext);
SLPlaybackRateItf pRateItf = (SLPlaybackRateItf)pContext;
SLresult res = (*pRateItf)->GetRate(pRateItf, &rate); CheckErr(res);
res = (*pRateItf)->GetRateRange(pRateItf, 0, &minRate, &maxRate, &stepSize, &capa);
CheckErr(res);
fprintf(stdout, "old rate = %d, minRate=%d, maxRate=%d\n", rate, minRate, maxRate);
rate /= 2;
if (rate < minRate) {
rate = minRate;
}
fprintf(stdout, "new rate = %d\n", rate);
res = (*pRateItf)->SetRate(pRateItf, rate); CheckErr(res);
if (res == SL_RESULT_FEATURE_UNSUPPORTED) {
fprintf(stderr, "new playback rate %d per mille is unsupported\n", rate);
} else {
CheckErr(res);
}
}
if (event & SL_PLAYEVENT_HEADATMARKER) {
fprintf(stdout, "SL_PLAYEVENT_HEADATMARKER ");
}
if (event & SL_PLAYEVENT_HEADATNEWPOS) {
fprintf(stdout, "SL_PLAYEVENT_HEADATNEWPOS ");
}
if (event & SL_PLAYEVENT_HEADMOVING) {
fprintf(stdout, "SL_PLAYEVENT_HEADMOVING ");
}
if (event & SL_PLAYEVENT_HEADSTALLED) {
fprintf(stdout, "SL_PLAYEVENT_HEADSTALLED");
}
fprintf(stdout, "\n");
}
//-----------------------------------------------------------------
/* PrefetchStatusItf callback for an audio player */
void PrefetchEventCallback( SLPrefetchStatusItf caller, void *pContext, SLuint32 event)
{
//fprintf(stdout, "\t\tPrefetchEventCallback: received event %u\n", event);
SLresult result;
assert(pContext == NULL);
SLpermille level = 0;
result = (*caller)->GetFillLevel(caller, &level);
CheckErr(result);
SLuint32 status;
result = (*caller)->GetPrefetchStatus(caller, &status);
CheckErr(result);
if (event & SL_PREFETCHEVENT_FILLLEVELCHANGE) {
fprintf(stdout, "\t\tPrefetchEventCallback: Buffer fill level is = %d\n", level);
}
if (event & SL_PREFETCHEVENT_STATUSCHANGE) {
fprintf(stdout, "\t\tPrefetchEventCallback: Prefetch Status is = %u\n", status);
}
SLuint32 new_prefetch_status;
if ((event & PREFETCHEVENT_ERROR_CANDIDATE) == PREFETCHEVENT_ERROR_CANDIDATE
&& level == 0 && status == SL_PREFETCHSTATUS_UNDERFLOW) {
fprintf(stdout, "\t\tPrefetchEventCallback: Error while prefetching data, exiting\n");
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);
}
// Display rate capabilities in a nicely formatted way
void printCapabilities(SLuint32 capabilities)
{
bool needBar = false;
printf("0x%x (", capabilities);
#define _(x) \
if (capabilities & SL_RATEPROP_##x) { \
if (needBar) \
printf("|"); \
printf("SL_RATEPROP_" #x); \
needBar = true; \
capabilities &= ~SL_RATEPROP_##x; \
}
_(SILENTAUDIO)
_(STAGGEREDAUDIO)
_(NOPITCHCORAUDIO)
_(PITCHCORAUDIO)
if (capabilities != 0) {
if (needBar)
printf("|");
printf("0x%x", capabilities);
needBar = true;
}
if (!needBar)
printf("N/A");
printf(")");
}
//-----------------------------------------------------------------
/* Play some music from a URI */
void TestSlowDownUri( SLObjectItf sl, const char* path)
{
SLEngineItf EngineItf;
SLint32 numOutputs = 0;
SLuint32 deviceID = 0;
SLresult res;
SLDataSource audioSource;
SLDataLocator_URI uri;
SLDataFormat_MIME mime;
SLDataSink audioSink;
SLDataLocator_OutputMix locator_outputmix;
SLObjectItf player;
SLPlayItf playItf;
SLSeekItf seekItf;
SLPrefetchStatusItf prefetchItf;
SLPlaybackRateItf rateItf;
SLObjectItf OutputMix;
SLboolean required[MAX_NUMBER_INTERFACES];
SLInterfaceID iidArray[MAX_NUMBER_INTERFACES];
/* Get the SL Engine Interface which is implicit */
res = (*sl)->GetInterface(sl, SL_IID_ENGINE, (void*)&EngineItf); CheckErr(res);
/* Initialize arrays required[] and iidArray[] */
for (int i=0 ; i < MAX_NUMBER_INTERFACES ; i++) {
required[i] = SL_BOOLEAN_FALSE;
iidArray[i] = SL_IID_NULL;
}
required[0] = SL_BOOLEAN_TRUE;
iidArray[0] = SL_IID_VOLUME;
// Create Output Mix object to be used by player
res = (*EngineItf)->CreateOutputMix(EngineItf, &OutputMix, 0,
iidArray, required); CheckErr(res);
// Realizing the Output Mix object in synchronous mode.
res = (*OutputMix)->Realize(OutputMix, SL_BOOLEAN_FALSE); CheckErr(res);
/* Setup the data source structure for the URI */
uri.locatorType = SL_DATALOCATOR_URI;
uri.URI = (SLchar*) path;
mime.formatType = SL_DATAFORMAT_MIME;
mime.mimeType = (SLchar*)NULL;
mime.containerType = SL_CONTAINERTYPE_UNSPECIFIED;
audioSource.pFormat = (void *)&mime;
audioSource.pLocator = (void *)&uri;
/* Setup the data sink structure */
locator_outputmix.locatorType = SL_DATALOCATOR_OUTPUTMIX;
locator_outputmix.outputMix = OutputMix;
audioSink.pLocator = (void *)&locator_outputmix;
audioSink.pFormat = NULL;
/******************************************************/
/* Create the audio player */
required[0] = SL_BOOLEAN_TRUE;
iidArray[0] = SL_IID_SEEK;
required[1] = SL_BOOLEAN_TRUE;
iidArray[1] = SL_IID_PREFETCHSTATUS;
required[2] = SL_BOOLEAN_TRUE;
iidArray[2] = SL_IID_PLAYBACKRATE;
res = (*EngineItf)->CreateAudioPlayer(EngineItf, &player, &audioSource, &audioSink,
MAX_NUMBER_INTERFACES, iidArray, required); CheckErr(res);
/* Realizing the player in synchronous mode. */
res = (*player)->Realize(player, SL_BOOLEAN_FALSE); CheckErr(res);
fprintf(stdout, "URI example: after Realize\n");
/* Get interfaces */
res = (*player)->GetInterface(player, SL_IID_PLAY, (void*)&playItf); CheckErr(res);
res = (*player)->GetInterface(player, SL_IID_SEEK, (void*)&seekItf); CheckErr(res);
res = (*player)->GetInterface(player, SL_IID_PLAYBACKRATE, (void*)&rateItf); CheckErr(res);
res = (*player)->GetInterface(player, SL_IID_PREFETCHSTATUS, (void*)&prefetchItf);
CheckErr(res);
res = (*prefetchItf)->RegisterCallback(prefetchItf, PrefetchEventCallback, NULL);
CheckErr(res);
res = (*prefetchItf)->SetCallbackEventsMask(prefetchItf,
SL_PREFETCHEVENT_FILLLEVELCHANGE | SL_PREFETCHEVENT_STATUSCHANGE); CheckErr(res);
/* Configure fill level updates every 5 percent */
(*prefetchItf)->SetFillUpdatePeriod(prefetchItf, 50); CheckErr(res);
/* Display duration */
SLmillisecond durationInMsec = SL_TIME_UNKNOWN;
res = (*playItf)->GetDuration(playItf, &durationInMsec); CheckErr(res);
if (durationInMsec == SL_TIME_UNKNOWN) {
fprintf(stdout, "Content duration is unknown (before starting to prefetch)\n");
} else {
fprintf(stdout, "Content duration is %u ms (before starting to prefetch)\n",
durationInMsec);
}
/* Loop on the whole of the content */
res = (*seekItf)->SetLoop(seekItf, SL_BOOLEAN_TRUE, 0, SL_TIME_UNKNOWN); CheckErr(res);
/* Set up marker and position callbacks */
res = (*playItf)->RegisterCallback(playItf, PlayEventCallback, (void *) rateItf);
CheckErr(res);
res = (*playItf)->SetCallbackEventsMask(playItf,
SL_PLAYEVENT_HEADATEND | SL_PLAYEVENT_HEADATMARKER | SL_PLAYEVENT_HEADATNEWPOS);
res = (*playItf)->SetMarkerPosition(playItf, 1500); CheckErr(res);
res = (*playItf)->SetPositionUpdatePeriod(playItf, 500); CheckErr(res);
/* Get the default rate */
SLpermille rate = 1234;
res = (*rateItf)->GetRate(rateItf, &rate); CheckErr(res);
printf("default rate = %d per mille\n", rate);
assert(1000 == rate);
/* Get the default rate properties */
SLuint32 properties = 0;
res = (*rateItf)->GetProperties(rateItf, &properties); CheckErr(res);
printf("default rate properties: ");
printCapabilities(properties);
printf("\n");
assert(SL_RATEPROP_NOPITCHCORAUDIO == properties);
/* Get all supported playback rate ranges */
SLuint8 index;
for (index = 0; ; ++index) {
SLpermille minRate, maxRate, stepSize;
SLuint32 capabilities;
res = (*rateItf)->GetRateRange(rateItf, index, &minRate, &maxRate, &stepSize,
&capabilities);
if (res == SL_RESULT_PARAMETER_INVALID) {
if (index == 0) {
fprintf(stderr, "implementation supports no rate ranges\n");
}
break;
}
CheckErr(res);
if (index == 255) {
fprintf(stderr, "implementation supports way too many rate ranges, I'm giving up\n");
break;
}
printf("range[%u]: min=%d, max=%d, capabilities=", index, minRate, maxRate);
printCapabilities(capabilities);
printf("\n");
}
/* Change the playback rate before playback */
res = (*rateItf)->SetRate(rateItf, INITIAL_RATE);
if (res == SL_RESULT_FEATURE_UNSUPPORTED || res == SL_RESULT_PARAMETER_INVALID) {
fprintf(stderr, "initial playback rate %d per mille is unsupported\n", INITIAL_RATE);
} else {
CheckErr(res);
}
/******************************************************/
/* Play the URI */
/* first cause the player to prefetch the data */
res = (*playItf)->SetPlayState( playItf, SL_PLAYSTATE_PAUSED ); CheckErr(res);
// 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 destroyRes;
}
/* Display duration again, */
res = (*playItf)->GetDuration(playItf, &durationInMsec); CheckErr(res);
if (durationInMsec == SL_TIME_UNKNOWN) {
fprintf(stdout, "Content duration is unknown (after prefetch completed)\n");
} else {
fprintf(stdout, "Content duration is %u ms (after prefetch completed)\n", durationInMsec);
}
/* Start playing */
fprintf(stdout, "starting to play\n");
res = (*playItf)->SetPlayState( playItf, SL_PLAYSTATE_PLAYING ); CheckErr(res);
/* Wait as long as the duration of the content, times the repetitions,
* before stopping the loop */
#if 1
usleep( (REPETITIONS-1) * durationInMsec * 1100);
#else
int ii;
for (ii = 0; ii < REPETITIONS; ++ii) {
usleep(durationInMsec * 1100);
PlayEventCallback(playItf, (void *) rateItf, SL_PLAYEVENT_HEADATEND);
}
#endif
res = (*seekItf)->SetLoop(seekItf, SL_BOOLEAN_FALSE, 0, SL_TIME_UNKNOWN); CheckErr(res);
fprintf(stdout, "As of now, stopped looping (sound shouldn't repeat from now on)\n");
/* wait some more to make sure it doesn't repeat */
usleep(durationInMsec * 1000);
/* Stop playback */
fprintf(stdout, "stopping playback\n");
res = (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_STOPPED); CheckErr(res);
destroyRes:
/* Destroy the player */
(*player)->Destroy(player);
/* Destroy Output Mix object */
(*OutputMix)->Destroy(OutputMix);
}
//-----------------------------------------------------------------
int main(int argc, char* const argv[])
{
SLresult res;
SLObjectItf sl;
fprintf(stdout, "OpenSL ES test %s: exercises SLPlayItf, SLSeekItf, SLPlaybackRateItf\n",
argv[0]);
fprintf(stdout, "and AudioPlayer with SLDataLocator_URI source / OutputMix sink\n");
fprintf(stdout, "Plays a sound and loops it %d times while changing the \n", REPETITIONS);
fprintf(stdout, "playback rate each time.\n\n");
if (argc == 1) {
fprintf(stdout, "Usage: \n\t%s path \n\t%s url\n", argv[0], argv[0]);
fprintf(stdout, "Example: \"%s /sdcard/my.mp3\" or \"%s file:///sdcard/my.mp3\"\n",
argv[0], argv[0]);
return EXIT_FAILURE;
}
SLEngineOption EngineOption[] = {
{(SLuint32) SL_ENGINEOPTION_THREADSAFE,
(SLuint32) SL_BOOLEAN_TRUE}};
res = slCreateEngine( &sl, 1, EngineOption, 0, NULL, NULL);
CheckErr(res);
/* Realizing the SL Engine in synchronous mode. */
res = (*sl)->Realize(sl, SL_BOOLEAN_FALSE);
CheckErr(res);
TestSlowDownUri(sl, argv[1]);
/* Shutdown OpenSL ES */
(*sl)->Destroy(sl);
return EXIT_SUCCESS;
}