| 1 | #include <assert.h> |
| 2 | #include <getopt.h> |
| 3 | #include <pthread.h> |
| 4 | #include <stdbool.h> |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <unistd.h> |
| 8 | #include <SLES/OpenSLES.h> |
| 9 | #include <SLES/OpenSLES_Android.h> |
| 10 | |
| 11 | class AudioPlayer { |
| 12 | public: |
| 13 | AudioPlayer(); |
| 14 | ~AudioPlayer(); |
| 15 | void play(char const* uri); |
| 16 | private: |
| 17 | SLObjectItf mSlEngineObject{NULL}; |
| 18 | SLEngineItf mSlEngineInterface{NULL}; |
| 19 | SLObjectItf mSlOutputMixObject{NULL}; |
| 20 | }; |
| 21 | |
| 22 | class MutexWithCondition { |
| 23 | public: |
| 24 | MutexWithCondition() { pthread_mutex_lock(&mutex); } |
| 25 | ~MutexWithCondition() { pthread_mutex_unlock(&mutex); } |
| 26 | void waitFor() { while (!occurred) pthread_cond_wait(&condition, &mutex); } |
| 27 | /** From waking thread. */ |
| 28 | void lockAndSignal() { |
| 29 | pthread_mutex_lock(&mutex); |
| 30 | occurred = true; |
| 31 | pthread_cond_signal(&condition); |
| 32 | pthread_mutex_unlock(&mutex); |
| 33 | } |
| 34 | private: |
| 35 | volatile bool occurred{false}; |
| 36 | pthread_mutex_t mutex{PTHREAD_MUTEX_INITIALIZER}; |
| 37 | pthread_cond_t condition{PTHREAD_COND_INITIALIZER}; |
| 38 | }; |
| 39 | |
| 40 | AudioPlayer::AudioPlayer() { |
| 41 | // "OpenSL ES for Android is designed for multi-threaded applications, and is thread-safe. |
| 42 | // OpenSL ES for Android supports a single engine per application, and up to 32 objects. |
| 43 | // Available device memory and CPU may further restrict the usable number of objects. |
| 44 | // slCreateEngine recognizes, but ignores, these engine options: SL_ENGINEOPTION_THREADSAFE SL_ENGINEOPTION_LOSSOFCONTROL" |
| 45 | SLresult result = slCreateEngine(&mSlEngineObject, |
| 46 | /*numOptions=*/0, /*options=*/NULL, |
| 47 | /*numWantedInterfaces=*/0, /*wantedInterfaces=*/NULL, /*wantedInterfacesRequired=*/NULL); |
| 48 | assert(SL_RESULT_SUCCESS == result); |
| 49 | |
| 50 | result = (*mSlEngineObject)->Realize(mSlEngineObject, SL_BOOLEAN_FALSE); |
| 51 | assert(SL_RESULT_SUCCESS == result); |
| 52 | |
| 53 | result = (*mSlEngineObject)->GetInterface(mSlEngineObject, SL_IID_ENGINE, &mSlEngineInterface); |
| 54 | assert(SL_RESULT_SUCCESS == result); |
| 55 | |
| 56 | SLuint32 const numWantedInterfaces = 1; |
| 57 | SLInterfaceID wantedInterfaces[numWantedInterfaces]{ SL_IID_ENVIRONMENTALREVERB }; |
| 58 | SLboolean wantedInterfacesRequired[numWantedInterfaces]{ SL_BOOLEAN_TRUE }; |
| 59 | result = (*mSlEngineInterface)->CreateOutputMix(mSlEngineInterface, &mSlOutputMixObject, numWantedInterfaces, wantedInterfaces, wantedInterfacesRequired); |
| 60 | assert(SL_RESULT_SUCCESS == result); |
| 61 | |
| 62 | result = (*mSlOutputMixObject)->Realize(mSlOutputMixObject, SL_BOOLEAN_FALSE); |
| 63 | assert(SL_RESULT_SUCCESS == result); |
| 64 | |
| 65 | } |
| 66 | |
| 67 | void opensl_prefetch_callback(SLPrefetchStatusItf caller, void* pContext, SLuint32 event) { |
| 68 | if (event & SL_PREFETCHEVENT_STATUSCHANGE) { |
| 69 | SLpermille level = 0; |
| 70 | (*caller)->GetFillLevel(caller, &level); |
| 71 | if (level == 0) { |
| 72 | SLuint32 status; |
| 73 | (*caller)->GetPrefetchStatus(caller, &status); |
| 74 | if (status == SL_PREFETCHSTATUS_UNDERFLOW) { |
| 75 | // Level is 0 but we have SL_PREFETCHSTATUS_UNDERFLOW, implying an error. |
| 76 | printf("- ERROR: Underflow when prefetching data and fill level zero\n"); |
| 77 | MutexWithCondition* cond = (MutexWithCondition*) pContext; |
| 78 | cond->lockAndSignal(); |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | void opensl_player_callback(SLPlayItf /*caller*/, void* pContext, SLuint32 /*event*/) { |
| 85 | MutexWithCondition* condition = (MutexWithCondition*) pContext; |
| 86 | condition->lockAndSignal(); |
| 87 | } |
| 88 | |
| 89 | void AudioPlayer::play(char const* uri) |
| 90 | { |
| 91 | SLDataLocator_URI loc_uri = {SL_DATALOCATOR_URI, (SLchar *) uri}; |
| 92 | SLDataFormat_MIME format_mime = {SL_DATAFORMAT_MIME, NULL, SL_CONTAINERTYPE_UNSPECIFIED}; |
| 93 | SLDataSource audioSrc = {&loc_uri, &format_mime}; |
| 94 | |
| 95 | SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, mSlOutputMixObject}; |
| 96 | SLDataSink audioSnk = {&loc_outmix, NULL}; |
| 97 | |
| 98 | // SL_IID_ANDROIDCONFIGURATION is Android specific interface, SL_IID_VOLUME is general: |
| 99 | SLuint32 const numWantedInterfaces = 5; |
| 100 | SLInterfaceID wantedInterfaces[numWantedInterfaces]{ |
| 101 | SL_IID_ANDROIDCONFIGURATION, |
| 102 | SL_IID_VOLUME, |
| 103 | SL_IID_PREFETCHSTATUS, |
| 104 | SL_IID_PLAYBACKRATE, |
| 105 | SL_IID_EFFECTSEND |
| 106 | }; |
| 107 | SLboolean wantedInterfacesRequired[numWantedInterfaces]{ SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE }; |
| 108 | |
| 109 | SLObjectItf uriPlayerObject = NULL; |
| 110 | SLresult result = (*mSlEngineInterface)->CreateAudioPlayer(mSlEngineInterface, &uriPlayerObject, &audioSrc, &audioSnk, |
| 111 | numWantedInterfaces, wantedInterfaces, wantedInterfacesRequired); |
| 112 | assert(SL_RESULT_SUCCESS == result); |
| 113 | |
| 114 | // Android specific interface - usage: |
| 115 | // SLresult (*GetInterface) (SLObjectItf self, const SLInterfaceID iid, void* pInterface); |
| 116 | // This function gives different interfaces. One is android-specific, from |
| 117 | // <SLES/OpenSLES_AndroidConfiguration.h>, done before realization: |
| 118 | SLAndroidConfigurationItf androidConfig; |
| 119 | result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_ANDROIDCONFIGURATION, &androidConfig); |
| 120 | assert(SL_RESULT_SUCCESS == result); |
| 121 | |
| 122 | // This allows setting the stream type (default:SL_ANDROID_STREAM_MEDIA): |
| 123 | /* same as android.media.AudioManager.STREAM_VOICE_CALL */ |
| 124 | // #define SL_ANDROID_STREAM_VOICE ((SLint32) 0x00000000) |
| 125 | /* same as android.media.AudioManager.STREAM_SYSTEM */ |
| 126 | // #define SL_ANDROID_STREAM_SYSTEM ((SLint32) 0x00000001) |
| 127 | /* same as android.media.AudioManager.STREAM_RING */ |
| 128 | // #define SL_ANDROID_STREAM_RING ((SLint32) 0x00000002) |
| 129 | /* same as android.media.AudioManager.STREAM_MUSIC */ |
| 130 | // #define SL_ANDROID_STREAM_MEDIA ((SLint32) 0x00000003) |
| 131 | /* same as android.media.AudioManager.STREAM_ALARM */ |
| 132 | // #define SL_ANDROID_STREAM_ALARM ((SLint32) 0x00000004) |
| 133 | /* same as android.media.AudioManager.STREAM_NOTIFICATION */ |
| 134 | // #define SL_ANDROID_STREAM_NOTIFICATION ((SLint32) 0x00000005) |
| 135 | SLint32 androidStreamType = SL_ANDROID_STREAM_ALARM; |
| 136 | result = (*androidConfig)->SetConfiguration(androidConfig, SL_ANDROID_KEY_STREAM_TYPE, &androidStreamType, sizeof(SLint32)); |
| 137 | assert(SL_RESULT_SUCCESS == result); |
| 138 | |
| 139 | // We now Realize(). Note that the android config needs to be done before, but getting the SLPrefetchStatusItf after. |
| 140 | result = (*uriPlayerObject)->Realize(uriPlayerObject, /*async=*/SL_BOOLEAN_FALSE); |
| 141 | assert(SL_RESULT_SUCCESS == result); |
| 142 | |
| 143 | SLPrefetchStatusItf prefetchInterface; |
| 144 | result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PREFETCHSTATUS, &prefetchInterface); |
| 145 | assert(SL_RESULT_SUCCESS == result); |
| 146 | |
| 147 | SLPlayItf uriPlayerPlay = NULL; |
| 148 | result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PLAY, &uriPlayerPlay); |
| 149 | assert(SL_RESULT_SUCCESS == result); |
| 150 | |
| 151 | SLPlaybackRateItf playbackRateInterface; |
| 152 | result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PLAYBACKRATE, &playbackRateInterface); |
| 153 | assert(SL_RESULT_SUCCESS == result); |
| 154 | |
| 155 | if (NULL == uriPlayerPlay) { |
| 156 | fprintf(stderr, "Cannot play '%s'\n", uri); |
| 157 | } else { |
| 158 | result = (*uriPlayerPlay)->SetCallbackEventsMask(uriPlayerPlay, SL_PLAYEVENT_HEADSTALLED | SL_PLAYEVENT_HEADATEND); |
| 159 | assert(SL_RESULT_SUCCESS == result); |
| 160 | |
| 161 | MutexWithCondition condition; |
| 162 | result = (*uriPlayerPlay)->RegisterCallback(uriPlayerPlay, opensl_player_callback, &condition); |
| 163 | assert(SL_RESULT_SUCCESS == result); |
| 164 | |
| 165 | result = (*prefetchInterface)->RegisterCallback(prefetchInterface, opensl_prefetch_callback, &condition); |
| 166 | assert(SL_RESULT_SUCCESS == result); |
| 167 | result = (*prefetchInterface)->SetCallbackEventsMask(prefetchInterface, SL_PREFETCHEVENT_FILLLEVELCHANGE | SL_PREFETCHEVENT_STATUSCHANGE); |
| 168 | |
| 169 | // "For an audio player with URI data source, Object::Realize allocates resources but does not |
| 170 | // connect to the data source (i.e. "prepare") or begin pre-fetching data. These occur once the |
| 171 | // player state is set to either SL_PLAYSTATE_PAUSED or SL_PLAYSTATE_PLAYING." |
| 172 | // - http://mobilepearls.com/labs/native-android-api/ndk/docs/opensles/index.html |
| 173 | result = (*uriPlayerPlay)->SetPlayState(uriPlayerPlay, SL_PLAYSTATE_PLAYING); |
| 174 | assert(SL_RESULT_SUCCESS == result); |
| 175 | |
| 176 | condition.waitFor(); |
| 177 | } |
| 178 | |
| 179 | if (uriPlayerObject != NULL) (*uriPlayerObject)->Destroy(uriPlayerObject); |
| 180 | } |
| 181 | |
| 182 | |
| 183 | AudioPlayer::~AudioPlayer() |
| 184 | { |
| 185 | // "Be sure to destroy all objects on exit from your application. Objects should be destroyed in reverse order of their creation, |
| 186 | // as it is not safe to destroy an object that has any dependent objects. For example, destroy in this order: audio players |
| 187 | // and recorders, output mix, then finally the engine." |
| 188 | if (mSlOutputMixObject != NULL) { (*mSlOutputMixObject)->Destroy(mSlOutputMixObject); mSlOutputMixObject = NULL; } |
| 189 | if (mSlEngineObject != NULL) { (*mSlEngineObject)->Destroy(mSlEngineObject); mSlEngineObject = NULL; } |
| 190 | } |
| 191 | |
| 192 | |
| 193 | int main(int argc, char** argv) |
| 194 | { |
| 195 | bool help = false; |
| 196 | int c; |
| 197 | while ((c = getopt(argc, argv, "h")) != -1) { |
| 198 | switch (c) { |
| 199 | case 'h': help = true; break; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | if (help || optind == argc) { |
| 204 | printf("usage: %s [files]\n", argv[0]); |
| 205 | exit(0); |
| 206 | } |
| 207 | |
| 208 | AudioPlayer player; |
| 209 | for (int i = optind; i < argc; i++) player.play(argv[i]); |
| 210 | |
| 211 | return 0; |
| 212 | } |