Hugo Hudson | b83ad73 | 2011-07-14 23:31:17 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <variablespeed.h> |
| 18 | |
| 19 | #include <unistd.h> |
| 20 | #include <stdlib.h> |
| 21 | |
| 22 | #include <sola_time_scaler.h> |
| 23 | #include <ring_buffer.h> |
| 24 | |
| 25 | #include <hlogging.h> |
| 26 | |
| 27 | #include <vector> |
| 28 | |
| 29 | // **************************************************************************** |
| 30 | // Constants, utility methods, structures and other miscellany used throughout |
| 31 | // this file. |
| 32 | |
| 33 | namespace { |
| 34 | |
| 35 | // These variables are used to determine the size of the buffer queue used by |
| 36 | // the decoder. |
| 37 | // This is not the same as the large buffer used to hold the uncompressed data |
| 38 | // - for that see the member variable decodeBuffer_. |
| 39 | // The choice of 1152 corresponds to the number of samples per mp3 frame, so is |
| 40 | // a good choice of size for a decoding buffer in the absence of other |
| 41 | // information (we don't know exactly what formats we will be working with). |
| 42 | const size_t kNumberOfBuffersInQueue = 4; |
| 43 | const size_t kNumberOfSamplesPerBuffer = 1152; |
| 44 | const size_t kBufferSizeInBytes = 2 * kNumberOfSamplesPerBuffer; |
| 45 | const size_t kSampleSizeInBytes = 4; |
| 46 | |
| 47 | // When calculating play buffer size before pushing to audio player. |
| 48 | const size_t kNumberOfBytesPerInt16 = 2; |
| 49 | |
| 50 | // How long to sleep during the main play loop and the decoding callback loop. |
| 51 | // In due course this should be replaced with the better signal and wait on |
| 52 | // condition rather than busy-looping. |
| 53 | const int kSleepTimeMicros = 1000; |
| 54 | |
| 55 | // Used in detecting errors with the OpenSL ES framework. |
| 56 | const SLuint32 kPrefetchErrorCandidate = |
| 57 | SL_PREFETCHEVENT_STATUSCHANGE | SL_PREFETCHEVENT_FILLLEVELCHANGE; |
| 58 | |
| 59 | // Structure used when we perform a decoding callback. |
| 60 | typedef struct CallbackContext_ { |
| 61 | SLPlayItf decoderPlay; |
| 62 | // Pointer to local storage buffers for decoded audio data. |
| 63 | int8_t* pDataBase; |
| 64 | // Pointer to the current buffer within local storage. |
| 65 | int8_t* pData; |
| 66 | } CallbackContext; |
| 67 | |
| 68 | // Local storage for decoded audio data. |
| 69 | int8_t pcmData[kNumberOfBuffersInQueue * kBufferSizeInBytes]; |
| 70 | |
| 71 | #define CheckSLResult(message, result) \ |
| 72 | CheckSLResult_Real(message, result, __LINE__) |
| 73 | |
| 74 | // Helper function for debugging - checks the OpenSL result for success. |
| 75 | void CheckSLResult_Real(const char* message, SLresult result, int line) { |
| 76 | // This can be helpful when debugging. |
| 77 | // LOGD("sl result %d for %s", result, message); |
| 78 | if (SL_RESULT_SUCCESS != result) { |
| 79 | LOGE("slresult was %d at %s file variablespeed line %d", |
| 80 | static_cast<int>(result), message, line); |
| 81 | } |
| 82 | CHECK(SL_RESULT_SUCCESS == result); |
| 83 | } |
| 84 | |
| 85 | } // namespace |
| 86 | |
| 87 | // **************************************************************************** |
| 88 | // Static instance of audio engine, and methods for getting, setting and |
| 89 | // deleting it. |
| 90 | |
| 91 | // The single global audio engine instance. |
| 92 | AudioEngine* AudioEngine::audioEngine_ = NULL; |
| 93 | android::Mutex publishEngineLock_; |
| 94 | |
| 95 | AudioEngine* AudioEngine::GetEngine() { |
| 96 | android::Mutex::Autolock autoLock(publishEngineLock_); |
| 97 | if (audioEngine_ == NULL) { |
| 98 | LOGE("you haven't initialized the audio engine"); |
| 99 | CHECK(false); |
| 100 | return NULL; |
| 101 | } |
| 102 | return audioEngine_; |
| 103 | } |
| 104 | |
| 105 | void AudioEngine::SetEngine(AudioEngine* engine) { |
| 106 | if (audioEngine_ != NULL) { |
| 107 | LOGE("you have already set the audio engine"); |
| 108 | CHECK(false); |
| 109 | return; |
| 110 | } |
| 111 | audioEngine_ = engine; |
| 112 | } |
| 113 | |
| 114 | void AudioEngine::DeleteEngine() { |
| 115 | if (audioEngine_ == NULL) { |
| 116 | LOGE("you haven't initialized the audio engine"); |
| 117 | CHECK(false); |
| 118 | return; |
| 119 | } |
| 120 | delete audioEngine_; |
| 121 | audioEngine_ = NULL; |
| 122 | } |
| 123 | |
| 124 | // **************************************************************************** |
| 125 | // The callbacks from the engine require static callback functions. |
| 126 | // Here are the static functions - they just delegate to instance methods on |
| 127 | // the engine. |
| 128 | |
| 129 | static void PlayingBufferQueueCb(SLAndroidSimpleBufferQueueItf, void*) { |
| 130 | AudioEngine::GetEngine()->PlayingBufferQueueCallback(); |
| 131 | } |
| 132 | |
| 133 | static void PrefetchEventCb(SLPrefetchStatusItf caller, void*, SLuint32 event) { |
| 134 | AudioEngine::GetEngine()->PrefetchEventCallback(caller, event); |
| 135 | } |
| 136 | |
| 137 | static void DecodingBufferQueueCb(SLAndroidSimpleBufferQueueItf queueItf, |
| 138 | void *context) { |
| 139 | AudioEngine::GetEngine()->DecodingBufferQueueCallback(queueItf, context); |
| 140 | } |
| 141 | |
| 142 | static void DecodingEventCb(SLPlayItf caller, void*, SLuint32 event) { |
| 143 | AudioEngine::GetEngine()->DecodingEventCallback(caller, event); |
| 144 | } |
| 145 | |
| 146 | // **************************************************************************** |
| 147 | // Static utility methods. |
| 148 | |
| 149 | static void PausePlaying(SLPlayItf playItf) { |
| 150 | SLresult result = (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_PAUSED); |
| 151 | CheckSLResult("pause playing", result); |
| 152 | } |
| 153 | |
| 154 | static void StartPlaying(SLPlayItf playItf) { |
| 155 | SLresult result = (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_PLAYING); |
| 156 | CheckSLResult("start playing", result); |
| 157 | } |
| 158 | |
| 159 | static void StopPlaying(SLPlayItf playItf) { |
| 160 | SLresult result = (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_STOPPED); |
| 161 | CheckSLResult("stop playing", result); |
| 162 | } |
| 163 | |
| 164 | static void ExtractMetadataFromDecoder(SLObjectItf decoder) { |
| 165 | SLMetadataExtractionItf decoderMetadata; |
| 166 | SLresult result = (*decoder)->GetInterface(decoder, |
| 167 | SL_IID_METADATAEXTRACTION, &decoderMetadata); |
| 168 | CheckSLResult("getting metadata interface", result); |
| 169 | SLuint32 itemCount; |
| 170 | result = (*decoderMetadata)->GetItemCount(decoderMetadata, &itemCount); |
| 171 | CheckSLResult("getting item count", result); |
| 172 | SLuint32 i, keySize, valueSize; |
| 173 | SLMetadataInfo *keyInfo, *value; |
| 174 | for (i = 0; i < itemCount ; ++i) { |
| 175 | keyInfo = NULL; |
| 176 | keySize = 0; |
| 177 | value = NULL; |
| 178 | valueSize = 0; |
| 179 | result = (*decoderMetadata)->GetKeySize(decoderMetadata, i, &keySize); |
| 180 | CheckSLResult("get key size", result); |
| 181 | keyInfo = static_cast<SLMetadataInfo*>(malloc(keySize)); |
| 182 | if (keyInfo) { |
| 183 | result = (*decoderMetadata)->GetKey( |
| 184 | decoderMetadata, i, keySize, keyInfo); |
| 185 | CheckSLResult("get key", result); |
| 186 | if (keyInfo->encoding == SL_CHARACTERENCODING_ASCII |
| 187 | || keyInfo->encoding == SL_CHARACTERENCODING_UTF8) { |
| 188 | result = (*decoderMetadata)->GetValueSize( |
| 189 | decoderMetadata, i, &valueSize); |
| 190 | CheckSLResult("get value size", result); |
| 191 | value = static_cast<SLMetadataInfo*>(malloc(valueSize)); |
| 192 | if (value) { |
| 193 | result = (*decoderMetadata)->GetValue( |
| 194 | decoderMetadata, i, valueSize, value); |
| 195 | CheckSLResult("get value", result); |
| 196 | if (value->encoding == SL_CHARACTERENCODING_BINARY) { |
| 197 | LOGD("key[%d] size=%d, name=%s value size=%d value=%d", |
| 198 | i, keyInfo->size, keyInfo->data, value->size, |
| 199 | *(reinterpret_cast<SLuint32*>(value->data))); |
| 200 | } |
| 201 | free(value); |
| 202 | } |
| 203 | } |
| 204 | free(keyInfo); |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | static void SeekToPosition(SLSeekItf seekItf, size_t startPositionMillis) { |
| 210 | SLresult result = (*seekItf)->SetPosition( |
| 211 | seekItf, startPositionMillis, SL_SEEKMODE_ACCURATE); |
| 212 | CheckSLResult("seek to position", result); |
| 213 | } |
| 214 | |
| 215 | static void RegisterCallbackContextAndAddEnqueueBuffersToDecoder( |
| 216 | SLAndroidSimpleBufferQueueItf decoderQueue, SLPlayItf player, |
| 217 | android::Mutex &callbackLock) { |
| 218 | android::Mutex::Autolock autoLock(callbackLock); |
| 219 | // Initialize the callback structure, used during the decoding. |
| 220 | // Then register a callback on the decoder queue, so that we will be called |
| 221 | // throughout the decoding process (and can then extract the decoded audio |
| 222 | // for the next bit of the pipeline). |
| 223 | CallbackContext cntxt; |
| 224 | cntxt.decoderPlay = player; |
| 225 | cntxt.pDataBase = pcmData; |
| 226 | cntxt.pData = pcmData; |
| 227 | { |
| 228 | SLresult result = (*decoderQueue)->RegisterCallback( |
| 229 | decoderQueue, DecodingBufferQueueCb, &cntxt); |
| 230 | CheckSLResult("decode callback", result); |
| 231 | } |
| 232 | |
| 233 | // Enqueue buffers to map the region of memory allocated to store the |
| 234 | // decoded data. |
| 235 | for (size_t i = 0; i < kNumberOfBuffersInQueue; i++) { |
| 236 | SLresult result = (*decoderQueue)->Enqueue( |
| 237 | decoderQueue, cntxt.pData, kBufferSizeInBytes); |
| 238 | CheckSLResult("enqueue something", result); |
| 239 | cntxt.pData += kBufferSizeInBytes; |
| 240 | } |
| 241 | cntxt.pData = cntxt.pDataBase; |
| 242 | } |
| 243 | |
| 244 | // **************************************************************************** |
| 245 | // Constructor and Destructor. |
| 246 | |
| 247 | AudioEngine::AudioEngine(size_t channels, size_t sampleRate, |
| 248 | size_t targetFrames, float windowDuration, float windowOverlapDuration, |
| 249 | size_t maxPlayBufferCount, float initialRate, size_t decodeInitialSize, |
| 250 | size_t decodeMaxSize, size_t startPositionMillis) |
| 251 | : decodeBuffer_(decodeInitialSize, decodeMaxSize), |
| 252 | playingBuffers_(), freeBuffers_(), timeScaler_(NULL), |
| 253 | floatBuffer_(NULL), injectBuffer_(NULL), |
| 254 | channels_(channels), sampleRate_(sampleRate), slSampleRate_(0), |
| 255 | slOutputChannels_(0), |
| 256 | targetFrames_(targetFrames), |
| 257 | windowDuration_(windowDuration), |
| 258 | windowOverlapDuration_(windowOverlapDuration), |
| 259 | maxPlayBufferCount_(maxPlayBufferCount), initialRate_(initialRate), |
| 260 | startPositionMillis_(startPositionMillis), |
| 261 | totalDurationMs_(0), startRequested_(false), |
| 262 | stopRequested_(false), finishedDecoding_(false) { |
| 263 | if (sampleRate_ == 44100) { |
| 264 | slSampleRate_ = SL_SAMPLINGRATE_44_1; |
| 265 | } else if (sampleRate_ == 8000) { |
| 266 | slSampleRate_ = SL_SAMPLINGRATE_8; |
| 267 | } else if (sampleRate_ == 11025) { |
| 268 | slSampleRate_ = SL_SAMPLINGRATE_11_025; |
| 269 | } else { |
| 270 | LOGE("unknown sample rate, not changing"); |
| 271 | CHECK(false); |
| 272 | } |
| 273 | if (channels_ == 2) { |
| 274 | slOutputChannels_ = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT; |
| 275 | } else if (channels_ == 1) { |
| 276 | slOutputChannels_ = SL_SPEAKER_FRONT_LEFT; |
| 277 | } else { |
| 278 | LOGE("unknown channels, not changing"); |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | AudioEngine::~AudioEngine() { |
| 283 | // destroy the time scaler |
| 284 | if (timeScaler_ != NULL) { |
| 285 | delete timeScaler_; |
| 286 | timeScaler_ = NULL; |
| 287 | } |
| 288 | |
| 289 | // delete all outstanding playing and free buffers |
| 290 | android::Mutex::Autolock autoLock(playBufferLock_); |
| 291 | while (playingBuffers_.size() > 0) { |
| 292 | delete[] playingBuffers_.front(); |
| 293 | playingBuffers_.pop(); |
| 294 | } |
| 295 | while (freeBuffers_.size() > 0) { |
| 296 | delete[] freeBuffers_.top(); |
| 297 | freeBuffers_.pop(); |
| 298 | } |
| 299 | |
| 300 | delete[] floatBuffer_; |
| 301 | floatBuffer_ = NULL; |
| 302 | delete[] injectBuffer_; |
| 303 | injectBuffer_ = NULL; |
| 304 | } |
| 305 | |
| 306 | // **************************************************************************** |
| 307 | // Regular AudioEngine class methods. |
| 308 | |
| 309 | void AudioEngine::SetVariableSpeed(float speed) { |
| 310 | GetTimeScaler()->set_speed(speed); |
| 311 | } |
| 312 | |
| 313 | void AudioEngine::RequestStart() { |
| 314 | android::Mutex::Autolock autoLock(lock_); |
| 315 | startRequested_ = true; |
| 316 | } |
| 317 | |
| 318 | void AudioEngine::ClearRequestStart() { |
| 319 | android::Mutex::Autolock autoLock(lock_); |
| 320 | startRequested_ = false; |
| 321 | } |
| 322 | |
| 323 | bool AudioEngine::GetWasStartRequested() { |
| 324 | android::Mutex::Autolock autoLock(lock_); |
| 325 | return startRequested_; |
| 326 | } |
| 327 | |
| 328 | void AudioEngine::RequestStop() { |
| 329 | android::Mutex::Autolock autoLock(lock_); |
| 330 | stopRequested_ = true; |
| 331 | } |
| 332 | |
| 333 | int AudioEngine::GetCurrentPosition() { |
| 334 | android::Mutex::Autolock autoLock(decodeBufferLock_); |
| 335 | double result = decodeBuffer_.GetTotalAdvancedCount(); |
| 336 | return static_cast<int>( |
| 337 | (result * 1000) / sampleRate_ / channels_ + startPositionMillis_); |
| 338 | } |
| 339 | |
| 340 | int AudioEngine::GetTotalDuration() { |
| 341 | android::Mutex::Autolock autoLock(lock_); |
| 342 | return static_cast<int>(totalDurationMs_); |
| 343 | } |
| 344 | |
| 345 | video_editing::SolaTimeScaler* AudioEngine::GetTimeScaler() { |
| 346 | if (timeScaler_ == NULL) { |
| 347 | timeScaler_ = new video_editing::SolaTimeScaler(); |
| 348 | timeScaler_->Init(sampleRate_, channels_, initialRate_, windowDuration_, |
| 349 | windowOverlapDuration_); |
| 350 | } |
| 351 | return timeScaler_; |
| 352 | } |
| 353 | |
| 354 | void AudioEngine::PrefetchDurationSampleRateAndChannels( |
| 355 | SLPlayItf playItf, SLPrefetchStatusItf prefetchItf) { |
| 356 | // Set play state to pause, to begin the prefetching. |
| 357 | PausePlaying(playItf); |
| 358 | |
| 359 | // Wait until the data has been prefetched. |
| 360 | // TODO(hugohudson): 0. Not dealing with error just yet. |
| 361 | { |
| 362 | SLuint32 prefetchStatus = SL_PREFETCHSTATUS_UNDERFLOW; |
| 363 | android::Mutex::Autolock autoLock(prefetchLock_); |
| 364 | while (prefetchStatus != SL_PREFETCHSTATUS_SUFFICIENTDATA) { |
| 365 | LOGI("waiting for condition"); |
| 366 | // prefetchCondition_.waitRelative(prefetchLock, 1000 * 1000 * 10); |
| 367 | usleep(10 * 1000); |
| 368 | LOGI("getting the value"); |
| 369 | (*prefetchItf)->GetPrefetchStatus(prefetchItf, &prefetchStatus); |
| 370 | } |
| 371 | LOGI("done with wait"); |
| 372 | } |
| 373 | |
| 374 | SLmillisecond durationInMsec = SL_TIME_UNKNOWN; |
| 375 | SLresult result = (*playItf)->GetDuration(playItf, &durationInMsec); |
| 376 | CheckSLResult("getting duration", result); |
| 377 | CHECK(durationInMsec != SL_TIME_UNKNOWN); |
| 378 | LOGD("duration: %d", static_cast<int>(durationInMsec)); |
| 379 | android::Mutex::Autolock autoLock(lock_); |
| 380 | totalDurationMs_ = durationInMsec; |
| 381 | } |
| 382 | |
| 383 | bool AudioEngine::EnqueueNextBufferOfAudio( |
| 384 | SLAndroidSimpleBufferQueueItf audioPlayerQueue) { |
| 385 | size_t frameSizeInBytes = kSampleSizeInBytes * channels_; |
| 386 | size_t frameCount = 0; |
| 387 | while (frameCount < targetFrames_) { |
| 388 | size_t framesLeft = targetFrames_ - frameCount; |
| 389 | // If there is data already in the time scaler, retrieve it. |
| 390 | if (GetTimeScaler()->available() > 0) { |
| 391 | size_t retrieveCount = min(GetTimeScaler()->available(), framesLeft); |
| 392 | int count = GetTimeScaler()->RetrieveSamples( |
| 393 | floatBuffer_ + frameCount * channels_, retrieveCount); |
| 394 | if (count <= 0) { |
| 395 | LOGD("ERROR: Count was %d", count); |
| 396 | break; |
| 397 | } |
| 398 | frameCount += count; |
| 399 | continue; |
| 400 | } |
| 401 | // If there is no data in the time scaler, then feed some into it. |
| 402 | android::Mutex::Autolock autoLock(decodeBufferLock_); |
| 403 | size_t framesInDecodeBuffer = |
| 404 | decodeBuffer_.GetSizeInBytes() / frameSizeInBytes; |
| 405 | size_t framesScalerCanHandle = GetTimeScaler()->input_limit(); |
| 406 | size_t framesToInject = min(framesInDecodeBuffer, |
| 407 | min(targetFrames_, framesScalerCanHandle)); |
| 408 | if (framesToInject <= 0) { |
| 409 | // No more frames left to inject. |
| 410 | break; |
| 411 | } |
| 412 | for (size_t i = 0; i < framesToInject * channels_ ; ++i) { |
| 413 | injectBuffer_[i] = decodeBuffer_.GetAtIndex(i); |
| 414 | } |
| 415 | int count = GetTimeScaler()->InjectSamples(injectBuffer_, framesToInject); |
| 416 | if (count <= 0) { |
| 417 | LOGD("ERROR: Count was %d", count); |
| 418 | break; |
| 419 | } |
| 420 | decodeBuffer_.AdvanceHeadPointerShorts(count * channels_); |
| 421 | } |
| 422 | if (frameCount <= 0) { |
| 423 | // We must have finished playback. |
| 424 | if (GetEndOfDecoderReached()) { |
| 425 | // If we've finished decoding, clear the buffer - so we will terminate. |
| 426 | ClearDecodeBuffer(); |
| 427 | } |
| 428 | return false; |
| 429 | } |
| 430 | |
| 431 | // Get a free playing buffer. |
| 432 | int16* playBuffer; |
| 433 | { |
| 434 | android::Mutex::Autolock autoLock(playBufferLock_); |
| 435 | if (freeBuffers_.size() > 0) { |
| 436 | // If we have a free buffer, recycle it. |
| 437 | playBuffer = freeBuffers_.top(); |
| 438 | freeBuffers_.pop(); |
| 439 | } else { |
| 440 | // Otherwise allocate a new one. |
| 441 | playBuffer = new int16[targetFrames_ * channels_]; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | // Try to play the buffer. |
| 446 | for (size_t i = 0; i < frameCount * channels_ ; ++i) { |
| 447 | playBuffer[i] = floatBuffer_[i]; |
| 448 | } |
| 449 | size_t sizeOfPlayBufferInBytes = |
| 450 | frameCount * channels_ * kNumberOfBytesPerInt16; |
| 451 | SLresult result = (*audioPlayerQueue)->Enqueue(audioPlayerQueue, playBuffer, |
| 452 | sizeOfPlayBufferInBytes); |
| 453 | CheckSLResult("enqueue prebuilt audio", result); |
| 454 | if (result == SL_RESULT_SUCCESS) { |
| 455 | android::Mutex::Autolock autoLock(playBufferLock_); |
| 456 | playingBuffers_.push(playBuffer); |
| 457 | } else { |
| 458 | LOGE("could not enqueue audio buffer"); |
| 459 | delete[] playBuffer; |
| 460 | } |
| 461 | |
| 462 | return (result == SL_RESULT_SUCCESS); |
| 463 | } |
| 464 | |
| 465 | bool AudioEngine::GetEndOfDecoderReached() { |
| 466 | android::Mutex::Autolock autoLock(lock_); |
| 467 | return finishedDecoding_; |
| 468 | } |
| 469 | |
| 470 | void AudioEngine::SetEndOfDecoderReached() { |
| 471 | android::Mutex::Autolock autoLock(lock_); |
| 472 | finishedDecoding_ = true; |
| 473 | } |
| 474 | |
| 475 | bool AudioEngine::PlayFileDescriptor(int fd, int64 offset, int64 length) { |
| 476 | SLDataLocator_AndroidFD loc_fd = { |
| 477 | SL_DATALOCATOR_ANDROIDFD, fd, offset, length }; |
| 478 | SLDataFormat_MIME format_mime = { |
| 479 | SL_DATAFORMAT_MIME, NULL, SL_CONTAINERTYPE_UNSPECIFIED }; |
| 480 | SLDataSource audioSrc = { &loc_fd, &format_mime }; |
| 481 | return PlayFromThisSource(audioSrc); |
| 482 | } |
| 483 | |
| 484 | bool AudioEngine::PlayUri(const char* uri) { |
| 485 | // Source of audio data for the decoding |
| 486 | SLDataLocator_URI decUri = { SL_DATALOCATOR_URI, |
| 487 | const_cast<SLchar*>(reinterpret_cast<const SLchar*>(uri)) }; |
| 488 | SLDataFormat_MIME decMime = { |
| 489 | SL_DATAFORMAT_MIME, NULL, SL_CONTAINERTYPE_UNSPECIFIED }; |
| 490 | SLDataSource decSource = { &decUri, &decMime }; |
| 491 | return PlayFromThisSource(decSource); |
| 492 | } |
| 493 | |
| 494 | bool AudioEngine::IsDecodeBufferEmpty() { |
| 495 | android::Mutex::Autolock autoLock(decodeBufferLock_); |
| 496 | return decodeBuffer_.GetSizeInBytes() <= 0; |
| 497 | } |
| 498 | |
| 499 | void AudioEngine::ClearDecodeBuffer() { |
| 500 | android::Mutex::Autolock autoLock(decodeBufferLock_); |
| 501 | decodeBuffer_.Clear(); |
| 502 | } |
| 503 | |
| 504 | bool AudioEngine::PlayFromThisSource(const SLDataSource& audioSrc) { |
| 505 | ClearDecodeBuffer(); |
| 506 | floatBuffer_ = new float[targetFrames_ * channels_]; |
| 507 | injectBuffer_ = new float[targetFrames_ * channels_]; |
| 508 | |
| 509 | // Create the engine. |
| 510 | SLEngineOption EngineOption[] = { { |
| 511 | SL_ENGINEOPTION_THREADSAFE, SL_BOOLEAN_TRUE } }; |
| 512 | SLObjectItf engine; |
| 513 | SLresult result = slCreateEngine(&engine, 1, EngineOption, 0, NULL, NULL); |
| 514 | CheckSLResult("create engine", result); |
| 515 | result = (*engine)->Realize(engine, SL_BOOLEAN_FALSE); |
| 516 | CheckSLResult("realise engine", result); |
| 517 | SLEngineItf engineInterface; |
| 518 | result = (*engine)->GetInterface(engine, SL_IID_ENGINE, &engineInterface); |
| 519 | CheckSLResult("get interface", result); |
| 520 | |
| 521 | // Create the output mix for playing. |
| 522 | SLObjectItf outputMix; |
| 523 | result = (*engineInterface)->CreateOutputMix( |
| 524 | engineInterface, &outputMix, 0, NULL, NULL); |
| 525 | CheckSLResult("create output mix", result); |
| 526 | result = (*outputMix)->Realize(outputMix, SL_BOOLEAN_FALSE); |
| 527 | CheckSLResult("realize", result); |
| 528 | |
| 529 | // Define the source and sink for the audio player: comes from a buffer queue |
| 530 | // and goes to the output mix. |
| 531 | SLDataLocator_AndroidSimpleBufferQueue loc_bufq = { |
| 532 | SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2 }; |
| 533 | SLDataFormat_PCM format_pcm = {SL_DATAFORMAT_PCM, channels_, slSampleRate_, |
| 534 | SL_PCMSAMPLEFORMAT_FIXED_16, SL_PCMSAMPLEFORMAT_FIXED_16, |
| 535 | slOutputChannels_, SL_BYTEORDER_LITTLEENDIAN}; |
| 536 | SLDataSource playingSrc = {&loc_bufq, &format_pcm}; |
| 537 | SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, outputMix}; |
| 538 | SLDataSink audioSnk = {&loc_outmix, NULL}; |
| 539 | |
| 540 | // Create the audio player, which will play from the buffer queue and send to |
| 541 | // the output mix. |
| 542 | const size_t playerInterfaceCount = 1; |
| 543 | const SLInterfaceID iids[playerInterfaceCount] = { |
| 544 | SL_IID_ANDROIDSIMPLEBUFFERQUEUE }; |
| 545 | const SLboolean reqs[playerInterfaceCount] = { SL_BOOLEAN_TRUE }; |
| 546 | SLObjectItf audioPlayer; |
| 547 | result = (*engineInterface)->CreateAudioPlayer(engineInterface, &audioPlayer, |
| 548 | &playingSrc, &audioSnk, playerInterfaceCount, iids, reqs); |
| 549 | CheckSLResult("create audio player", result); |
| 550 | result = (*audioPlayer)->Realize(audioPlayer, SL_BOOLEAN_FALSE); |
| 551 | CheckSLResult("realize buffer queue", result); |
| 552 | |
| 553 | // Get the play interface from the player, as well as the buffer queue |
| 554 | // interface from its source. |
| 555 | // Register for callbacks during play. |
| 556 | SLPlayItf audioPlayerPlay; |
| 557 | result = (*audioPlayer)->GetInterface( |
| 558 | audioPlayer, SL_IID_PLAY, &audioPlayerPlay); |
| 559 | CheckSLResult("get interface", result); |
| 560 | SLAndroidSimpleBufferQueueItf audioPlayerQueue; |
| 561 | result = (*audioPlayer)->GetInterface(audioPlayer, |
| 562 | SL_IID_ANDROIDSIMPLEBUFFERQUEUE, &audioPlayerQueue); |
| 563 | CheckSLResult("get interface again", result); |
| 564 | result = (*audioPlayerQueue)->RegisterCallback( |
| 565 | audioPlayerQueue, PlayingBufferQueueCb, NULL); |
| 566 | CheckSLResult("register callback", result); |
| 567 | |
| 568 | // Define the source and sink for the decoding player: comes from the source |
| 569 | // this method was called with, is sent to another buffer queue. |
| 570 | SLDataLocator_AndroidSimpleBufferQueue decBuffQueue; |
| 571 | decBuffQueue.locatorType = SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE; |
| 572 | decBuffQueue.numBuffers = kNumberOfBuffersInQueue; |
| 573 | // A valid value seems required here but is currently ignored. |
| 574 | SLDataFormat_PCM pcm = {SL_DATAFORMAT_PCM, 1, slSampleRate_, |
| 575 | SL_PCMSAMPLEFORMAT_FIXED_16, 16, |
| 576 | SL_SPEAKER_FRONT_LEFT, SL_BYTEORDER_LITTLEENDIAN}; |
| 577 | SLDataSink decDest = { &decBuffQueue, &pcm }; |
| 578 | |
| 579 | // Create the decoder with the given source and sink. |
| 580 | const size_t decoderInterfaceCount = 4; |
| 581 | SLObjectItf decoder; |
| 582 | const SLInterfaceID decodePlayerInterfaces[decoderInterfaceCount] = { |
| 583 | SL_IID_ANDROIDSIMPLEBUFFERQUEUE, SL_IID_PREFETCHSTATUS, SL_IID_SEEK, |
| 584 | SL_IID_METADATAEXTRACTION }; |
| 585 | const SLboolean decodePlayerRequired[decoderInterfaceCount] = { |
| 586 | SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE }; |
| 587 | SLDataSource sourceCopy(audioSrc); |
| 588 | result = (*engineInterface)->CreateAudioPlayer(engineInterface, &decoder, |
| 589 | &sourceCopy, &decDest, decoderInterfaceCount, decodePlayerInterfaces, |
| 590 | decodePlayerRequired); |
| 591 | CheckSLResult("create audio player", result); |
| 592 | result = (*decoder)->Realize(decoder, SL_BOOLEAN_FALSE); |
| 593 | CheckSLResult("realize in sync mode", result); |
| 594 | |
| 595 | // Get the play interface from the decoder, and register event callbacks. |
| 596 | // Get the buffer queue, prefetch and seek interfaces. |
| 597 | SLPlayItf decoderPlay; |
| 598 | result = (*decoder)->GetInterface(decoder, SL_IID_PLAY, &decoderPlay); |
| 599 | CheckSLResult("get play interface, implicit", result); |
| 600 | result = (*decoderPlay)->SetCallbackEventsMask( |
| 601 | decoderPlay, SL_PLAYEVENT_HEADATEND); |
| 602 | CheckSLResult("set the event mask", result); |
| 603 | result = (*decoderPlay)->RegisterCallback( |
| 604 | decoderPlay, DecodingEventCb, NULL); |
| 605 | CheckSLResult("register decoding event callback", result); |
| 606 | SLAndroidSimpleBufferQueueItf decoderQueue; |
| 607 | result = (*decoder)->GetInterface( |
| 608 | decoder, SL_IID_ANDROIDSIMPLEBUFFERQUEUE, &decoderQueue); |
| 609 | CheckSLResult("get decoder buffer queue", result); |
| 610 | SLPrefetchStatusItf decoderPrefetch; |
| 611 | result = (*decoder)->GetInterface( |
| 612 | decoder, SL_IID_PREFETCHSTATUS, &decoderPrefetch); |
| 613 | CheckSLResult("get prefetch status interface", result); |
| 614 | SLSeekItf decoderSeek; |
| 615 | result = (*decoder)->GetInterface(decoder, SL_IID_SEEK, &decoderSeek); |
| 616 | CheckSLResult("get seek interface", result); |
| 617 | |
| 618 | RegisterCallbackContextAndAddEnqueueBuffersToDecoder( |
| 619 | decoderQueue, decoderPlay, callbackLock_); |
| 620 | |
| 621 | // Initialize the callback for prefetch errors, if we can't open the |
| 622 | // resource to decode. |
| 623 | result = (*decoderPrefetch)->SetCallbackEventsMask( |
| 624 | decoderPrefetch, kPrefetchErrorCandidate); |
| 625 | CheckSLResult("set prefetch callback mask", result); |
| 626 | result = (*decoderPrefetch)->RegisterCallback( |
| 627 | decoderPrefetch, PrefetchEventCb, &decoderPrefetch); |
| 628 | CheckSLResult("set prefetch callback", result); |
| 629 | |
| 630 | SeekToPosition(decoderSeek, startPositionMillis_); |
| 631 | |
| 632 | PrefetchDurationSampleRateAndChannels(decoderPlay, decoderPrefetch); |
| 633 | |
| 634 | ExtractMetadataFromDecoder(decoder); |
| 635 | |
| 636 | StartPlaying(decoderPlay); |
| 637 | |
| 638 | // The main loop - until we're told to stop: if there is audio data coming |
| 639 | // out of the decoder, feed it through the time scaler. |
| 640 | // As it comes out of the time scaler, feed it into the audio player. |
| 641 | while (!Finished()) { |
| 642 | if (GetWasStartRequested()) { |
| 643 | ClearRequestStart(); |
| 644 | StartPlaying(audioPlayerPlay); |
| 645 | } |
| 646 | EnqueueMoreAudioIfNecessary(audioPlayerQueue); |
| 647 | usleep(kSleepTimeMicros); |
| 648 | } |
| 649 | |
| 650 | StopPlaying(audioPlayerPlay); |
| 651 | StopPlaying(decoderPlay); |
| 652 | |
| 653 | // Delete the audio player. |
| 654 | result = (*audioPlayerQueue)->Clear(audioPlayerQueue); |
| 655 | CheckSLResult("clear audio player queue", result); |
| 656 | result = (*audioPlayerQueue)->RegisterCallback(audioPlayerQueue, NULL, NULL); |
| 657 | CheckSLResult("clear callback", result); |
| 658 | (*audioPlayer)->AbortAsyncOperation(audioPlayer); |
| 659 | audioPlayerPlay = NULL; |
| 660 | audioPlayerQueue = NULL; |
| 661 | (*audioPlayer)->Destroy(audioPlayer); |
| 662 | |
| 663 | // Delete the decoder. |
| 664 | result = (*decoderPrefetch)->RegisterCallback(decoderPrefetch, NULL, NULL); |
| 665 | CheckSLResult("clearing prefetch error callback", result); |
| 666 | // TODO(hugohudson): 0. This is returning slresult 13 if I do no playback. |
| 667 | // Repro is to comment out all before this line, and all after enqueueing |
| 668 | // my buffers. |
| 669 | // result = (*decoderQueue)->Clear(decoderQueue); |
| 670 | // CheckSLResult("clearing decode buffer queue", result); |
| 671 | result = (*decoderQueue)->RegisterCallback(decoderQueue, NULL, NULL); |
| 672 | CheckSLResult("clearing decode callback", result); |
| 673 | decoderSeek = NULL; |
| 674 | decoderPrefetch = NULL; |
| 675 | decoderQueue = NULL; |
| 676 | result = (*decoderPlay)->RegisterCallback(decoderPlay, NULL, NULL); |
| 677 | CheckSLResult("clear decoding event callback", result); |
| 678 | (*decoder)->AbortAsyncOperation(decoder); |
| 679 | decoderPlay = NULL; |
| 680 | (*decoder)->Destroy(decoder); |
| 681 | |
| 682 | // Delete the output mix, then the engine. |
| 683 | (*outputMix)->Destroy(outputMix); |
| 684 | engineInterface = NULL; |
| 685 | (*engine)->Destroy(engine); |
| 686 | |
| 687 | return true; |
| 688 | } |
| 689 | |
| 690 | bool AudioEngine::Finished() { |
| 691 | if (GetWasStopRequested()) { |
| 692 | return true; |
| 693 | } |
| 694 | android::Mutex::Autolock autoLock(playBufferLock_); |
| 695 | return playingBuffers_.size() <= 0 && |
| 696 | IsDecodeBufferEmpty() && |
| 697 | GetEndOfDecoderReached(); |
| 698 | } |
| 699 | |
| 700 | bool AudioEngine::GetWasStopRequested() { |
| 701 | android::Mutex::Autolock autoLock(lock_); |
| 702 | return stopRequested_; |
| 703 | } |
| 704 | |
| 705 | bool AudioEngine::GetHasReachedPlayingBuffersLimit() { |
| 706 | android::Mutex::Autolock autoLock(playBufferLock_); |
| 707 | return playingBuffers_.size() >= maxPlayBufferCount_; |
| 708 | } |
| 709 | |
| 710 | void AudioEngine::EnqueueMoreAudioIfNecessary( |
| 711 | SLAndroidSimpleBufferQueueItf audioPlayerQueue) { |
| 712 | bool keepEnqueueing = true; |
| 713 | while (!GetWasStopRequested() && |
| 714 | !IsDecodeBufferEmpty() && |
| 715 | !GetHasReachedPlayingBuffersLimit() && |
| 716 | keepEnqueueing) { |
| 717 | keepEnqueueing = EnqueueNextBufferOfAudio(audioPlayerQueue); |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | bool AudioEngine::DecodeBufferTooFull() { |
| 722 | android::Mutex::Autolock autoLock(decodeBufferLock_); |
| 723 | return decodeBuffer_.IsTooLarge(); |
| 724 | } |
| 725 | |
| 726 | // **************************************************************************** |
| 727 | // Code for handling the static callbacks. |
| 728 | |
| 729 | void AudioEngine::PlayingBufferQueueCallback() { |
| 730 | // The head playing buffer is done, move it to the free list. |
| 731 | android::Mutex::Autolock autoLock(playBufferLock_); |
| 732 | if (playingBuffers_.size() > 0) { |
| 733 | freeBuffers_.push(playingBuffers_.front()); |
| 734 | playingBuffers_.pop(); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | void AudioEngine::PrefetchEventCallback( |
| 739 | SLPrefetchStatusItf caller, SLuint32 event) { |
| 740 | // If there was a problem during decoding, then signal the end. |
| 741 | LOGI("in the prefetch callback"); |
| 742 | SLpermille level = 0; |
| 743 | SLresult result = (*caller)->GetFillLevel(caller, &level); |
| 744 | CheckSLResult("get fill level", result); |
| 745 | SLuint32 status; |
| 746 | result = (*caller)->GetPrefetchStatus(caller, &status); |
| 747 | CheckSLResult("get prefetch status", result); |
| 748 | if ((kPrefetchErrorCandidate == (event & kPrefetchErrorCandidate)) && |
| 749 | (level == 0) && |
| 750 | (status == SL_PREFETCHSTATUS_UNDERFLOW)) { |
| 751 | LOGI("PrefetchEventCallback error while prefetching data"); |
| 752 | SetEndOfDecoderReached(); |
| 753 | } |
| 754 | if (SL_PREFETCHSTATUS_SUFFICIENTDATA == event) { |
| 755 | LOGI("looks like our event..."); |
| 756 | // android::Mutex::Autolock autoLock(prefetchLock_); |
| 757 | // prefetchCondition_.broadcast(); |
| 758 | LOGI("just sent a broadcast"); |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | void AudioEngine::DecodingBufferQueueCallback( |
| 763 | SLAndroidSimpleBufferQueueItf queueItf, void *context) { |
| 764 | if (GetWasStopRequested()) { |
| 765 | return; |
| 766 | } |
| 767 | |
| 768 | CallbackContext *pCntxt; |
| 769 | { |
| 770 | android::Mutex::Autolock autoLock(callbackLock_); |
| 771 | pCntxt = reinterpret_cast<CallbackContext*>(context); |
| 772 | } |
| 773 | { |
| 774 | android::Mutex::Autolock autoLock(decodeBufferLock_); |
| 775 | decodeBuffer_.AddData(pCntxt->pDataBase, kBufferSizeInBytes); |
| 776 | } |
| 777 | |
| 778 | // Increase data pointer by buffer size |
| 779 | pCntxt->pData += kBufferSizeInBytes; |
| 780 | if (pCntxt->pData >= pCntxt->pDataBase + |
| 781 | (kNumberOfBuffersInQueue * kBufferSizeInBytes)) { |
| 782 | pCntxt->pData = pCntxt->pDataBase; |
| 783 | } |
| 784 | |
| 785 | SLresult result = (*queueItf)->Enqueue( |
| 786 | queueItf, pCntxt->pDataBase, kBufferSizeInBytes); |
| 787 | CheckSLResult("enqueue something else", result); |
| 788 | |
| 789 | // If we get too much data into the decoder, |
| 790 | // sleep until the playback catches up. |
| 791 | while (!GetWasStopRequested() && DecodeBufferTooFull()) { |
| 792 | usleep(kSleepTimeMicros); |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | void AudioEngine::DecodingEventCallback(SLPlayItf, SLuint32 event) { |
| 797 | if (SL_PLAYEVENT_HEADATEND & event) { |
| 798 | SetEndOfDecoderReached(); |
| 799 | } |
| 800 | } |