236 lines
9.0 KiB
C++
236 lines
9.0 KiB
C++
#include <assert.h>
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#include <getopt.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <SLES/OpenSLES.h>
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#include <SLES/OpenSLES_Android.h>
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class AudioPlayer {
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public:
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AudioPlayer();
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~AudioPlayer();
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void play(char const* uri);
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/**
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* This allows setting the stream type (default:SL_ANDROID_STREAM_MEDIA):
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* SL_ANDROID_STREAM_ALARM - same as android.media.AudioManager.STREAM_ALARM
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* SL_ANDROID_STREAM_MEDIA - same as android.media.AudioManager.STREAM_MUSIC
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* SL_ANDROID_STREAM_NOTIFICATION - same as android.media.AudioManager.STREAM_NOTIFICATION
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* SL_ANDROID_STREAM_RING - same as android.media.AudioManager.STREAM_RING
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* SL_ANDROID_STREAM_SYSTEM - same as android.media.AudioManager.STREAM_SYSTEM
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* SL_ANDROID_STREAM_VOICE - same as android.media.AudioManager.STREAM_VOICE_CALL
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*/
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void setStreamType(SLint32 streamType) { this->androidStreamType = streamType; }
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private:
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SLObjectItf mSlEngineObject{NULL};
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SLEngineItf mSlEngineInterface{NULL};
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SLObjectItf mSlOutputMixObject{NULL};
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SLint32 androidStreamType{SL_ANDROID_STREAM_MEDIA};
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};
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class MutexWithCondition {
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public:
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MutexWithCondition() {
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pthread_mutex_init(&mutex, NULL);
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pthread_cond_init(&condition, NULL);
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pthread_mutex_lock(&mutex);
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}
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~MutexWithCondition() { pthread_mutex_unlock(&mutex); }
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void waitFor() { while (!occurred) pthread_cond_wait(&condition, &mutex); }
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/** From waking thread. */
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void lockAndSignal() {
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pthread_mutex_lock(&mutex);
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occurred = true;
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pthread_cond_signal(&condition);
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pthread_mutex_unlock(&mutex);
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}
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private:
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volatile bool occurred{false};
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pthread_mutex_t mutex;
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pthread_cond_t condition;
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};
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AudioPlayer::AudioPlayer() {
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// "OpenSL ES for Android is designed for multi-threaded applications, and is thread-safe.
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// OpenSL ES for Android supports a single engine per application, and up to 32 objects.
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// Available device memory and CPU may further restrict the usable number of objects.
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// slCreateEngine recognizes, but ignores, these engine options: SL_ENGINEOPTION_THREADSAFE SL_ENGINEOPTION_LOSSOFCONTROL"
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SLresult result = slCreateEngine(&mSlEngineObject,
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/*numOptions=*/0, /*options=*/NULL,
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/*numWantedInterfaces=*/0, /*wantedInterfaces=*/NULL, /*wantedInterfacesRequired=*/NULL);
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assert(SL_RESULT_SUCCESS == result);
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result = (*mSlEngineObject)->Realize(mSlEngineObject, SL_BOOLEAN_FALSE);
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assert(SL_RESULT_SUCCESS == result);
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result = (*mSlEngineObject)->GetInterface(mSlEngineObject, SL_IID_ENGINE, &mSlEngineInterface);
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assert(SL_RESULT_SUCCESS == result);
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SLuint32 const numWantedInterfaces = 0;
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result = (*mSlEngineInterface)->CreateOutputMix(mSlEngineInterface, &mSlOutputMixObject, numWantedInterfaces, NULL, NULL);
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assert(SL_RESULT_SUCCESS == result);
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result = (*mSlOutputMixObject)->Realize(mSlOutputMixObject, SL_BOOLEAN_FALSE);
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assert(SL_RESULT_SUCCESS == result);
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}
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void opensl_prefetch_callback(SLPrefetchStatusItf caller, void* pContext, SLuint32 event) {
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if (event & SL_PREFETCHEVENT_STATUSCHANGE) {
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SLpermille level = 0;
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(*caller)->GetFillLevel(caller, &level);
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if (level == 0) {
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SLuint32 status;
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(*caller)->GetPrefetchStatus(caller, &status);
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if (status == SL_PREFETCHSTATUS_UNDERFLOW) {
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// Level is 0 but we have SL_PREFETCHSTATUS_UNDERFLOW, implying an error.
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printf("play-audio: underflow when prefetching data\n");
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MutexWithCondition* cond = (MutexWithCondition*) pContext;
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cond->lockAndSignal();
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}
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}
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}
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}
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void opensl_player_callback(SLPlayItf /*caller*/, void* pContext, SLuint32 /*event*/) {
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MutexWithCondition* condition = (MutexWithCondition*) pContext;
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condition->lockAndSignal();
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}
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void AudioPlayer::play(char const* uri)
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{
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SLDataLocator_URI loc_uri = {SL_DATALOCATOR_URI, (SLchar *) uri};
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SLDataFormat_MIME format_mime = {SL_DATAFORMAT_MIME, NULL, SL_CONTAINERTYPE_UNSPECIFIED};
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SLDataSource audioSrc = {&loc_uri, &format_mime};
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SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, mSlOutputMixObject};
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SLDataSink audioSnk = {&loc_outmix, NULL};
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// SL_IID_ANDROIDCONFIGURATION is Android specific interface, SL_IID_PREFETCHSTATUS is general:
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SLuint32 const numWantedInterfaces = 2;
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SLInterfaceID wantedInterfaces[numWantedInterfaces]{ SL_IID_ANDROIDCONFIGURATION, SL_IID_PREFETCHSTATUS };
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SLboolean wantedInterfacesRequired[numWantedInterfaces]{ SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE };
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SLObjectItf uriPlayerObject = NULL;
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SLresult result = (*mSlEngineInterface)->CreateAudioPlayer(mSlEngineInterface, &uriPlayerObject, &audioSrc, &audioSnk,
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numWantedInterfaces, wantedInterfaces, wantedInterfacesRequired);
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assert(SL_RESULT_SUCCESS == result);
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// Android specific interface - usage:
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// SLresult (*GetInterface) (SLObjectItf self, const SLInterfaceID iid, void* pInterface);
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// This function gives different interfaces. One is android-specific, from
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// <SLES/OpenSLES_AndroidConfiguration.h>, done before realization:
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SLAndroidConfigurationItf androidConfig;
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result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_ANDROIDCONFIGURATION, &androidConfig);
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assert(SL_RESULT_SUCCESS == result);
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result = (*androidConfig)->SetConfiguration(androidConfig, SL_ANDROID_KEY_STREAM_TYPE, &this->androidStreamType, sizeof(SLint32));
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assert(SL_RESULT_SUCCESS == result);
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// We now Realize(). Note that the android config needs to be done before, but getting the SLPrefetchStatusItf after.
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result = (*uriPlayerObject)->Realize(uriPlayerObject, /*async=*/SL_BOOLEAN_FALSE);
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assert(SL_RESULT_SUCCESS == result);
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SLPrefetchStatusItf prefetchInterface;
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result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PREFETCHSTATUS, &prefetchInterface);
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assert(SL_RESULT_SUCCESS == result);
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SLPlayItf uriPlayerPlay = NULL;
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result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PLAY, &uriPlayerPlay);
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assert(SL_RESULT_SUCCESS == result);
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if (NULL == uriPlayerPlay) {
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fprintf(stderr, "Cannot play '%s'\n", uri);
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} else {
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result = (*uriPlayerPlay)->SetCallbackEventsMask(uriPlayerPlay, SL_PLAYEVENT_HEADSTALLED | SL_PLAYEVENT_HEADATEND);
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assert(SL_RESULT_SUCCESS == result);
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MutexWithCondition condition;
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result = (*uriPlayerPlay)->RegisterCallback(uriPlayerPlay, opensl_player_callback, &condition);
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assert(SL_RESULT_SUCCESS == result);
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result = (*prefetchInterface)->RegisterCallback(prefetchInterface, opensl_prefetch_callback, &condition);
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assert(SL_RESULT_SUCCESS == result);
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result = (*prefetchInterface)->SetCallbackEventsMask(prefetchInterface, SL_PREFETCHEVENT_FILLLEVELCHANGE | SL_PREFETCHEVENT_STATUSCHANGE);
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// "For an audio player with URI data source, Object::Realize allocates resources but does not
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// connect to the data source (i.e. "prepare") or begin pre-fetching data. These occur once the
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// player state is set to either SL_PLAYSTATE_PAUSED or SL_PLAYSTATE_PLAYING."
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// - http://mobilepearls.com/labs/native-android-api/ndk/docs/opensles/index.html
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result = (*uriPlayerPlay)->SetPlayState(uriPlayerPlay, SL_PLAYSTATE_PLAYING);
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assert(SL_RESULT_SUCCESS == result);
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condition.waitFor();
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}
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if (uriPlayerObject != NULL) (*uriPlayerObject)->Destroy(uriPlayerObject);
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}
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AudioPlayer::~AudioPlayer()
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{
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// "Be sure to destroy all objects on exit from your application. Objects should be destroyed in reverse order of their creation,
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// as it is not safe to destroy an object that has any dependent objects. For example, destroy in this order: audio players
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// and recorders, output mix, then finally the engine."
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if (mSlOutputMixObject != NULL) { (*mSlOutputMixObject)->Destroy(mSlOutputMixObject); mSlOutputMixObject = NULL; }
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if (mSlEngineObject != NULL) { (*mSlEngineObject)->Destroy(mSlEngineObject); mSlEngineObject = NULL; }
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}
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int main(int argc, char** argv)
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{
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bool help = false;
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int c;
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char* streamType = NULL;
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while ((c = getopt(argc, argv, "hs:")) != -1) {
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switch (c) {
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case 'h':
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case '?': help = true; break;
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case 's': streamType = optarg; break;
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}
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}
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if (help || optind == argc) {
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printf("usage: play-audio [-s streamtype] [files]\n");
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return 1;
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}
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AudioPlayer player;
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if (streamType != NULL) {
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SLint32 streamTypeEnum;
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if (strcmp("alarm", streamType) == 0) {
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streamTypeEnum = SL_ANDROID_STREAM_ALARM;
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} else if (strcmp("media", streamType) == 0) {
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streamTypeEnum = SL_ANDROID_STREAM_MEDIA;
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} else if (strcmp("notification", streamType) == 0) {
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streamTypeEnum = SL_ANDROID_STREAM_NOTIFICATION;
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} else if (strcmp("ring", streamType) == 0) {
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streamTypeEnum = SL_ANDROID_STREAM_RING;
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} else if (strcmp("system", streamType) == 0) {
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streamTypeEnum = SL_ANDROID_STREAM_SYSTEM;
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} else if (strcmp("voice", streamType) == 0) {
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streamTypeEnum = SL_ANDROID_STREAM_VOICE;
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} else {
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fprintf(stderr, "play-audio: invalid streamtype '%s'\n", streamType);
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return 1;
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}
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player.setStreamType(streamTypeEnum);
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}
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for (int i = optind; i < argc; i++) {
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if (access(argv[i], R_OK) != 0) {
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fprintf(stderr, "play-audio: '%s' is not a readable file\n", argv[i]);
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return 1;
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}
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}
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for (int i = optind; i < argc; i++) {
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player.play(argv[i]);
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}
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return 0;
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}
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