AudioTrack.cpp revision 33797ea64d067dfeaacbfd7ebe7f3383b73961b5
1/* //device/extlibs/pv/android/AudioTrack.cpp 2** 3** Copyright 2007, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18 19//#define LOG_NDEBUG 0 20#define LOG_TAG "AudioTrack" 21 22#include <stdint.h> 23#include <sys/types.h> 24#include <limits.h> 25 26#include <sched.h> 27#include <sys/resource.h> 28 29#include <private/media/AudioTrackShared.h> 30 31#include <media/AudioSystem.h> 32#include <media/AudioTrack.h> 33 34#include <utils/Log.h> 35#include <binder/Parcel.h> 36#include <binder/IPCThreadState.h> 37#include <utils/Timers.h> 38 39#define LIKELY( exp ) (__builtin_expect( (exp) != 0, true )) 40#define UNLIKELY( exp ) (__builtin_expect( (exp) != 0, false )) 41 42namespace android { 43// --------------------------------------------------------------------------- 44 45// static 46status_t AudioTrack::getMinFrameCount( 47 int* frameCount, 48 int streamType, 49 uint32_t sampleRate) 50{ 51 int afSampleRate; 52 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 53 return NO_INIT; 54 } 55 int afFrameCount; 56 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 57 return NO_INIT; 58 } 59 uint32_t afLatency; 60 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 61 return NO_INIT; 62 } 63 64 // Ensure that buffer depth covers at least audio hardware latency 65 uint32_t minBufCount = afLatency / ((1000 * afFrameCount) / afSampleRate); 66 if (minBufCount < 2) minBufCount = 2; 67 68 *frameCount = (sampleRate == 0) ? afFrameCount * minBufCount : 69 afFrameCount * minBufCount * sampleRate / afSampleRate; 70 return NO_ERROR; 71} 72 73// --------------------------------------------------------------------------- 74 75AudioTrack::AudioTrack() 76 : mStatus(NO_INIT) 77{ 78} 79 80AudioTrack::AudioTrack( 81 int streamType, 82 uint32_t sampleRate, 83 int format, 84 int channels, 85 int frameCount, 86 uint32_t flags, 87 callback_t cbf, 88 void* user, 89 int notificationFrames, 90 int sessionId) 91 : mStatus(NO_INIT) 92{ 93 mStatus = set(streamType, sampleRate, format, channels, 94 frameCount, flags, cbf, user, notificationFrames, 95 0, false, sessionId); 96} 97 98AudioTrack::AudioTrack( 99 int streamType, 100 uint32_t sampleRate, 101 int format, 102 int channels, 103 const sp<IMemory>& sharedBuffer, 104 uint32_t flags, 105 callback_t cbf, 106 void* user, 107 int notificationFrames, 108 int sessionId) 109 : mStatus(NO_INIT) 110{ 111 mStatus = set(streamType, sampleRate, format, channels, 112 0, flags, cbf, user, notificationFrames, 113 sharedBuffer, false, sessionId); 114} 115 116AudioTrack::~AudioTrack() 117{ 118 LOGV_IF(mSharedBuffer != 0, "Destructor sharedBuffer: %p", mSharedBuffer->pointer()); 119 120 if (mStatus == NO_ERROR) { 121 // Make sure that callback function exits in the case where 122 // it is looping on buffer full condition in obtainBuffer(). 123 // Otherwise the callback thread will never exit. 124 stop(); 125 if (mAudioTrackThread != 0) { 126 mAudioTrackThread->requestExitAndWait(); 127 mAudioTrackThread.clear(); 128 } 129 mAudioTrack.clear(); 130 IPCThreadState::self()->flushCommands(); 131 } 132} 133 134status_t AudioTrack::set( 135 int streamType, 136 uint32_t sampleRate, 137 int format, 138 int channels, 139 int frameCount, 140 uint32_t flags, 141 callback_t cbf, 142 void* user, 143 int notificationFrames, 144 const sp<IMemory>& sharedBuffer, 145 bool threadCanCallJava, 146 int sessionId) 147{ 148 149 LOGV_IF(sharedBuffer != 0, "sharedBuffer: %p, size: %d", sharedBuffer->pointer(), sharedBuffer->size()); 150 151 AutoMutex lock(mLock); 152 if (mAudioTrack != 0) { 153 LOGE("Track already in use"); 154 return INVALID_OPERATION; 155 } 156 157 int afSampleRate; 158 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 159 return NO_INIT; 160 } 161 uint32_t afLatency; 162 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 163 return NO_INIT; 164 } 165 166 // handle default values first. 167 if (streamType == AudioSystem::DEFAULT) { 168 streamType = AudioSystem::MUSIC; 169 } 170 if (sampleRate == 0) { 171 sampleRate = afSampleRate; 172 } 173 // these below should probably come from the audioFlinger too... 174 if (format == 0) { 175 format = AudioSystem::PCM_16_BIT; 176 } 177 if (channels == 0) { 178 channels = AudioSystem::CHANNEL_OUT_STEREO; 179 } 180 181 // validate parameters 182 if (!AudioSystem::isValidFormat(format)) { 183 LOGE("Invalid format"); 184 return BAD_VALUE; 185 } 186 187 // force direct flag if format is not linear PCM 188 if (!AudioSystem::isLinearPCM(format)) { 189 flags |= AudioSystem::OUTPUT_FLAG_DIRECT; 190 } 191 192 if (!AudioSystem::isOutputChannel(channels)) { 193 LOGE("Invalid channel mask"); 194 return BAD_VALUE; 195 } 196 uint32_t channelCount = AudioSystem::popCount(channels); 197 198 audio_io_handle_t output = AudioSystem::getOutput((AudioSystem::stream_type)streamType, 199 sampleRate, format, channels, (AudioSystem::output_flags)flags); 200 201 if (output == 0) { 202 LOGE("Could not get audio output for stream type %d", streamType); 203 return BAD_VALUE; 204 } 205 206 mVolume[LEFT] = 1.0f; 207 mVolume[RIGHT] = 1.0f; 208 mSendLevel = 0; 209 mFrameCount = frameCount; 210 mNotificationFramesReq = notificationFrames; 211 mSessionId = sessionId; 212 mAuxEffectId = 0; 213 214 // create the IAudioTrack 215 status_t status = createTrack_l(streamType, 216 sampleRate, 217 format, 218 channelCount, 219 frameCount, 220 flags, 221 sharedBuffer, 222 output, 223 true); 224 225 if (status != NO_ERROR) { 226 return status; 227 } 228 229 if (cbf != 0) { 230 mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava); 231 if (mAudioTrackThread == 0) { 232 LOGE("Could not create callback thread"); 233 return NO_INIT; 234 } 235 } 236 237 mStatus = NO_ERROR; 238 239 mStreamType = streamType; 240 mFormat = format; 241 mChannels = channels; 242 mChannelCount = channelCount; 243 mSharedBuffer = sharedBuffer; 244 mMuted = false; 245 mActive = 0; 246 mCbf = cbf; 247 mUserData = user; 248 mLoopCount = 0; 249 mMarkerPosition = 0; 250 mMarkerReached = false; 251 mNewPosition = 0; 252 mUpdatePeriod = 0; 253 mFlags = flags; 254 255 return NO_ERROR; 256} 257 258status_t AudioTrack::initCheck() const 259{ 260 return mStatus; 261} 262 263// ------------------------------------------------------------------------- 264 265uint32_t AudioTrack::latency() const 266{ 267 return mLatency; 268} 269 270int AudioTrack::streamType() const 271{ 272 return mStreamType; 273} 274 275int AudioTrack::format() const 276{ 277 return mFormat; 278} 279 280int AudioTrack::channelCount() const 281{ 282 return mChannelCount; 283} 284 285uint32_t AudioTrack::frameCount() const 286{ 287 return mCblk->frameCount; 288} 289 290int AudioTrack::frameSize() const 291{ 292 if (AudioSystem::isLinearPCM(mFormat)) { 293 return channelCount()*((format() == AudioSystem::PCM_8_BIT) ? sizeof(uint8_t) : sizeof(int16_t)); 294 } else { 295 return sizeof(uint8_t); 296 } 297} 298 299sp<IMemory>& AudioTrack::sharedBuffer() 300{ 301 return mSharedBuffer; 302} 303 304// ------------------------------------------------------------------------- 305 306void AudioTrack::start() 307{ 308 sp<AudioTrackThread> t = mAudioTrackThread; 309 status_t status; 310 311 LOGV("start %p", this); 312 if (t != 0) { 313 if (t->exitPending()) { 314 if (t->requestExitAndWait() == WOULD_BLOCK) { 315 LOGE("AudioTrack::start called from thread"); 316 return; 317 } 318 } 319 t->mLock.lock(); 320 } 321 322 AutoMutex lock(mLock); 323 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 324 // while we are accessing the cblk 325 sp <IAudioTrack> audioTrack = mAudioTrack; 326 sp <IMemory> iMem = mCblkMemory; 327 audio_track_cblk_t* cblk = mCblk; 328 329 if (mActive == 0) { 330 mActive = 1; 331 mNewPosition = cblk->server + mUpdatePeriod; 332 cblk->lock.lock(); 333 cblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 334 cblk->waitTimeMs = 0; 335 cblk->flags &= ~CBLK_DISABLED_ON; 336 if (t != 0) { 337 t->run("AudioTrackThread", THREAD_PRIORITY_AUDIO_CLIENT); 338 } else { 339 setpriority(PRIO_PROCESS, 0, THREAD_PRIORITY_AUDIO_CLIENT); 340 } 341 342 LOGV("start %p before lock cblk %p", this, mCblk); 343 if (!(cblk->flags & CBLK_INVALID_MSK)) { 344 cblk->lock.unlock(); 345 status = mAudioTrack->start(); 346 cblk->lock.lock(); 347 if (status == DEAD_OBJECT) { 348 cblk->flags |= CBLK_INVALID_MSK; 349 } 350 } 351 if (cblk->flags & CBLK_INVALID_MSK) { 352 status = restoreTrack_l(cblk, true); 353 } 354 cblk->lock.unlock(); 355 if (status != NO_ERROR) { 356 LOGV("start() failed"); 357 mActive = 0; 358 if (t != 0) { 359 t->requestExit(); 360 } else { 361 setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_NORMAL); 362 } 363 } 364 } 365 366 if (t != 0) { 367 t->mLock.unlock(); 368 } 369} 370 371void AudioTrack::stop() 372{ 373 sp<AudioTrackThread> t = mAudioTrackThread; 374 375 LOGV("stop %p", this); 376 if (t != 0) { 377 t->mLock.lock(); 378 } 379 380 AutoMutex lock(mLock); 381 if (mActive == 1) { 382 mActive = 0; 383 mCblk->cv.signal(); 384 mAudioTrack->stop(); 385 // Cancel loops (If we are in the middle of a loop, playback 386 // would not stop until loopCount reaches 0). 387 setLoop_l(0, 0, 0); 388 // the playback head position will reset to 0, so if a marker is set, we need 389 // to activate it again 390 mMarkerReached = false; 391 // Force flush if a shared buffer is used otherwise audioflinger 392 // will not stop before end of buffer is reached. 393 if (mSharedBuffer != 0) { 394 flush_l(); 395 } 396 if (t != 0) { 397 t->requestExit(); 398 } else { 399 setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_NORMAL); 400 } 401 } 402 403 if (t != 0) { 404 t->mLock.unlock(); 405 } 406} 407 408bool AudioTrack::stopped() const 409{ 410 return !mActive; 411} 412 413void AudioTrack::flush() 414{ 415 AutoMutex lock(mLock); 416 flush_l(); 417} 418 419// must be called with mLock held 420void AudioTrack::flush_l() 421{ 422 LOGV("flush"); 423 424 // clear playback marker and periodic update counter 425 mMarkerPosition = 0; 426 mMarkerReached = false; 427 mUpdatePeriod = 0; 428 429 if (!mActive) { 430 mAudioTrack->flush(); 431 // Release AudioTrack callback thread in case it was waiting for new buffers 432 // in AudioTrack::obtainBuffer() 433 mCblk->cv.signal(); 434 } 435} 436 437void AudioTrack::pause() 438{ 439 LOGV("pause"); 440 AutoMutex lock(mLock); 441 if (mActive == 1) { 442 mActive = 0; 443 mAudioTrack->pause(); 444 } 445} 446 447void AudioTrack::mute(bool e) 448{ 449 mAudioTrack->mute(e); 450 mMuted = e; 451} 452 453bool AudioTrack::muted() const 454{ 455 return mMuted; 456} 457 458status_t AudioTrack::setVolume(float left, float right) 459{ 460 if (left > 1.0f || right > 1.0f) { 461 return BAD_VALUE; 462 } 463 464 AutoMutex lock(mLock); 465 mVolume[LEFT] = left; 466 mVolume[RIGHT] = right; 467 468 // write must be atomic 469 mCblk->volumeLR = (uint32_t(uint16_t(right * 0x1000)) << 16) | uint16_t(left * 0x1000); 470 471 return NO_ERROR; 472} 473 474void AudioTrack::getVolume(float* left, float* right) 475{ 476 if (left != NULL) { 477 *left = mVolume[LEFT]; 478 } 479 if (right != NULL) { 480 *right = mVolume[RIGHT]; 481 } 482} 483 484status_t AudioTrack::setAuxEffectSendLevel(float level) 485{ 486 LOGV("setAuxEffectSendLevel(%f)", level); 487 if (level > 1.0f) { 488 return BAD_VALUE; 489 } 490 AutoMutex lock(mLock); 491 492 mSendLevel = level; 493 494 mCblk->sendLevel = uint16_t(level * 0x1000); 495 496 return NO_ERROR; 497} 498 499void AudioTrack::getAuxEffectSendLevel(float* level) 500{ 501 if (level != NULL) { 502 *level = mSendLevel; 503 } 504} 505 506status_t AudioTrack::setSampleRate(int rate) 507{ 508 int afSamplingRate; 509 510 if (AudioSystem::getOutputSamplingRate(&afSamplingRate, mStreamType) != NO_ERROR) { 511 return NO_INIT; 512 } 513 // Resampler implementation limits input sampling rate to 2 x output sampling rate. 514 if (rate <= 0 || rate > afSamplingRate*2 ) return BAD_VALUE; 515 516 AutoMutex lock(mLock); 517 mCblk->sampleRate = rate; 518 return NO_ERROR; 519} 520 521uint32_t AudioTrack::getSampleRate() 522{ 523 AutoMutex lock(mLock); 524 return mCblk->sampleRate; 525} 526 527status_t AudioTrack::setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount) 528{ 529 AutoMutex lock(mLock); 530 return setLoop_l(loopStart, loopEnd, loopCount); 531} 532 533// must be called with mLock held 534status_t AudioTrack::setLoop_l(uint32_t loopStart, uint32_t loopEnd, int loopCount) 535{ 536 audio_track_cblk_t* cblk = mCblk; 537 538 Mutex::Autolock _l(cblk->lock); 539 540 if (loopCount == 0) { 541 cblk->loopStart = UINT_MAX; 542 cblk->loopEnd = UINT_MAX; 543 cblk->loopCount = 0; 544 mLoopCount = 0; 545 return NO_ERROR; 546 } 547 548 if (loopStart >= loopEnd || 549 loopEnd - loopStart > cblk->frameCount) { 550 LOGE("setLoop invalid value: loopStart %d, loopEnd %d, loopCount %d, framecount %d, user %d", loopStart, loopEnd, loopCount, cblk->frameCount, cblk->user); 551 return BAD_VALUE; 552 } 553 554 if ((mSharedBuffer != 0) && (loopEnd > cblk->frameCount)) { 555 LOGE("setLoop invalid value: loop markers beyond data: loopStart %d, loopEnd %d, framecount %d", 556 loopStart, loopEnd, cblk->frameCount); 557 return BAD_VALUE; 558 } 559 560 cblk->loopStart = loopStart; 561 cblk->loopEnd = loopEnd; 562 cblk->loopCount = loopCount; 563 mLoopCount = loopCount; 564 565 return NO_ERROR; 566} 567 568status_t AudioTrack::getLoop(uint32_t *loopStart, uint32_t *loopEnd, int *loopCount) 569{ 570 AutoMutex lock(mLock); 571 if (loopStart != 0) { 572 *loopStart = mCblk->loopStart; 573 } 574 if (loopEnd != 0) { 575 *loopEnd = mCblk->loopEnd; 576 } 577 if (loopCount != 0) { 578 if (mCblk->loopCount < 0) { 579 *loopCount = -1; 580 } else { 581 *loopCount = mCblk->loopCount; 582 } 583 } 584 585 return NO_ERROR; 586} 587 588status_t AudioTrack::setMarkerPosition(uint32_t marker) 589{ 590 if (mCbf == 0) return INVALID_OPERATION; 591 592 mMarkerPosition = marker; 593 mMarkerReached = false; 594 595 return NO_ERROR; 596} 597 598status_t AudioTrack::getMarkerPosition(uint32_t *marker) 599{ 600 if (marker == 0) return BAD_VALUE; 601 602 *marker = mMarkerPosition; 603 604 return NO_ERROR; 605} 606 607status_t AudioTrack::setPositionUpdatePeriod(uint32_t updatePeriod) 608{ 609 if (mCbf == 0) return INVALID_OPERATION; 610 611 uint32_t curPosition; 612 getPosition(&curPosition); 613 mNewPosition = curPosition + updatePeriod; 614 mUpdatePeriod = updatePeriod; 615 616 return NO_ERROR; 617} 618 619status_t AudioTrack::getPositionUpdatePeriod(uint32_t *updatePeriod) 620{ 621 if (updatePeriod == 0) return BAD_VALUE; 622 623 *updatePeriod = mUpdatePeriod; 624 625 return NO_ERROR; 626} 627 628status_t AudioTrack::setPosition(uint32_t position) 629{ 630 AutoMutex lock(mLock); 631 Mutex::Autolock _l(mCblk->lock); 632 633 if (!stopped()) return INVALID_OPERATION; 634 635 if (position > mCblk->user) return BAD_VALUE; 636 637 mCblk->server = position; 638 mCblk->flags |= CBLK_FORCEREADY_ON; 639 640 return NO_ERROR; 641} 642 643status_t AudioTrack::getPosition(uint32_t *position) 644{ 645 if (position == 0) return BAD_VALUE; 646 AutoMutex lock(mLock); 647 *position = mCblk->server; 648 649 return NO_ERROR; 650} 651 652status_t AudioTrack::reload() 653{ 654 AutoMutex lock(mLock); 655 656 if (!stopped()) return INVALID_OPERATION; 657 658 flush_l(); 659 660 mCblk->stepUser(mCblk->frameCount); 661 662 return NO_ERROR; 663} 664 665audio_io_handle_t AudioTrack::getOutput() 666{ 667 AutoMutex lock(mLock); 668 return getOutput_l(); 669} 670 671// must be called with mLock held 672audio_io_handle_t AudioTrack::getOutput_l() 673{ 674 return AudioSystem::getOutput((AudioSystem::stream_type)mStreamType, 675 mCblk->sampleRate, mFormat, mChannels, (AudioSystem::output_flags)mFlags); 676} 677 678int AudioTrack::getSessionId() 679{ 680 return mSessionId; 681} 682 683status_t AudioTrack::attachAuxEffect(int effectId) 684{ 685 LOGV("attachAuxEffect(%d)", effectId); 686 status_t status = mAudioTrack->attachAuxEffect(effectId); 687 if (status == NO_ERROR) { 688 mAuxEffectId = effectId; 689 } 690 return status; 691} 692 693// ------------------------------------------------------------------------- 694 695// must be called with mLock held 696status_t AudioTrack::createTrack_l( 697 int streamType, 698 uint32_t sampleRate, 699 int format, 700 int channelCount, 701 int frameCount, 702 uint32_t flags, 703 const sp<IMemory>& sharedBuffer, 704 audio_io_handle_t output, 705 bool enforceFrameCount) 706{ 707 status_t status; 708 const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger(); 709 if (audioFlinger == 0) { 710 LOGE("Could not get audioflinger"); 711 return NO_INIT; 712 } 713 714 int afSampleRate; 715 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 716 return NO_INIT; 717 } 718 int afFrameCount; 719 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 720 return NO_INIT; 721 } 722 uint32_t afLatency; 723 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 724 return NO_INIT; 725 } 726 727 mNotificationFramesAct = mNotificationFramesReq; 728 if (!AudioSystem::isLinearPCM(format)) { 729 if (sharedBuffer != 0) { 730 frameCount = sharedBuffer->size(); 731 } 732 } else { 733 // Ensure that buffer depth covers at least audio hardware latency 734 uint32_t minBufCount = afLatency / ((1000 * afFrameCount)/afSampleRate); 735 if (minBufCount < 2) minBufCount = 2; 736 737 int minFrameCount = (afFrameCount*sampleRate*minBufCount)/afSampleRate; 738 739 if (sharedBuffer == 0) { 740 if (frameCount == 0) { 741 frameCount = minFrameCount; 742 } 743 if (mNotificationFramesAct == 0) { 744 mNotificationFramesAct = frameCount/2; 745 } 746 // Make sure that application is notified with sufficient margin 747 // before underrun 748 if (mNotificationFramesAct > (uint32_t)frameCount/2) { 749 mNotificationFramesAct = frameCount/2; 750 } 751 if (frameCount < minFrameCount) { 752 if (enforceFrameCount) { 753 LOGE("Invalid buffer size: minFrameCount %d, frameCount %d", minFrameCount, frameCount); 754 return BAD_VALUE; 755 } else { 756 frameCount = minFrameCount; 757 } 758 } 759 } else { 760 // Ensure that buffer alignment matches channelcount 761 if (((uint32_t)sharedBuffer->pointer() & (channelCount | 1)) != 0) { 762 LOGE("Invalid buffer alignement: address %p, channelCount %d", sharedBuffer->pointer(), channelCount); 763 return BAD_VALUE; 764 } 765 frameCount = sharedBuffer->size()/channelCount/sizeof(int16_t); 766 } 767 } 768 769 sp<IAudioTrack> track = audioFlinger->createTrack(getpid(), 770 streamType, 771 sampleRate, 772 format, 773 channelCount, 774 frameCount, 775 ((uint16_t)flags) << 16, 776 sharedBuffer, 777 output, 778 &mSessionId, 779 &status); 780 781 if (track == 0) { 782 LOGE("AudioFlinger could not create track, status: %d", status); 783 return status; 784 } 785 sp<IMemory> cblk = track->getCblk(); 786 if (cblk == 0) { 787 LOGE("Could not get control block"); 788 return NO_INIT; 789 } 790 mAudioTrack.clear(); 791 mAudioTrack = track; 792 mCblkMemory.clear(); 793 mCblkMemory = cblk; 794 mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer()); 795 mCblk->flags |= CBLK_DIRECTION_OUT; 796 if (sharedBuffer == 0) { 797 mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t); 798 } else { 799 mCblk->buffers = sharedBuffer->pointer(); 800 // Force buffer full condition as data is already present in shared memory 801 mCblk->stepUser(mCblk->frameCount); 802 } 803 804 mCblk->volumeLR = (uint32_t(uint16_t(mVolume[RIGHT] * 0x1000)) << 16) | uint16_t(mVolume[LEFT] * 0x1000); 805 mCblk->sendLevel = uint16_t(mSendLevel * 0x1000); 806 mAudioTrack->attachAuxEffect(mAuxEffectId); 807 mCblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 808 mCblk->waitTimeMs = 0; 809 mRemainingFrames = mNotificationFramesAct; 810 mLatency = afLatency + (1000*mCblk->frameCount) / sampleRate; 811 return NO_ERROR; 812} 813 814status_t AudioTrack::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 815{ 816 AutoMutex lock(mLock); 817 int active; 818 status_t result; 819 audio_track_cblk_t* cblk = mCblk; 820 uint32_t framesReq = audioBuffer->frameCount; 821 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 822 823 audioBuffer->frameCount = 0; 824 audioBuffer->size = 0; 825 826 uint32_t framesAvail = cblk->framesAvailable(); 827 828 if (framesAvail == 0) { 829 cblk->lock.lock(); 830 goto start_loop_here; 831 while (framesAvail == 0) { 832 active = mActive; 833 if (UNLIKELY(!active)) { 834 LOGV("Not active and NO_MORE_BUFFERS"); 835 cblk->lock.unlock(); 836 return NO_MORE_BUFFERS; 837 } 838 if (UNLIKELY(!waitCount)) { 839 cblk->lock.unlock(); 840 return WOULD_BLOCK; 841 } 842 if (!(cblk->flags & CBLK_INVALID_MSK)) { 843 mLock.unlock(); 844 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 845 cblk->lock.unlock(); 846 mLock.lock(); 847 if (mActive == 0) { 848 return status_t(STOPPED); 849 } 850 cblk->lock.lock(); 851 } 852 853 if (cblk->flags & CBLK_INVALID_MSK) { 854 goto create_new_track; 855 } 856 if (__builtin_expect(result!=NO_ERROR, false)) { 857 cblk->waitTimeMs += waitTimeMs; 858 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 859 // timing out when a loop has been set and we have already written upto loop end 860 // is a normal condition: no need to wake AudioFlinger up. 861 if (cblk->user < cblk->loopEnd) { 862 LOGW( "obtainBuffer timed out (is the CPU pegged?) %p " 863 "user=%08x, server=%08x", this, cblk->user, cblk->server); 864 //unlock cblk mutex before calling mAudioTrack->start() (see issue #1617140) 865 cblk->lock.unlock(); 866 result = mAudioTrack->start(); 867 cblk->lock.lock(); 868 if (result == DEAD_OBJECT) { 869 cblk->flags |= CBLK_INVALID_MSK; 870create_new_track: 871 result = restoreTrack_l(cblk, false); 872 } 873 if (result != NO_ERROR) { 874 LOGW("obtainBuffer create Track error %d", result); 875 cblk->lock.unlock(); 876 return result; 877 } 878 } 879 cblk->waitTimeMs = 0; 880 } 881 882 if (--waitCount == 0) { 883 cblk->lock.unlock(); 884 return TIMED_OUT; 885 } 886 } 887 // read the server count again 888 start_loop_here: 889 framesAvail = cblk->framesAvailable_l(); 890 } 891 cblk->lock.unlock(); 892 } 893 894 // restart track if it was disabled by audioflinger due to previous underrun 895 if (mActive && (cblk->flags & CBLK_DISABLED_MSK)) { 896 AutoMutex _l(cblk->lock); 897 if (mActive && (cblk->flags & CBLK_DISABLED_MSK)) { 898 cblk->flags &= ~CBLK_DISABLED_ON; 899 cblk->lock.unlock(); 900 LOGW("obtainBuffer() track %p disabled, restarting", this); 901 mAudioTrack->start(); 902 cblk->lock.lock(); 903 } 904 } 905 906 cblk->waitTimeMs = 0; 907 908 if (framesReq > framesAvail) { 909 framesReq = framesAvail; 910 } 911 912 uint32_t u = cblk->user; 913 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 914 915 if (u + framesReq > bufferEnd) { 916 framesReq = bufferEnd - u; 917 } 918 919 audioBuffer->flags = mMuted ? Buffer::MUTE : 0; 920 audioBuffer->channelCount = mChannelCount; 921 audioBuffer->frameCount = framesReq; 922 audioBuffer->size = framesReq * cblk->frameSize; 923 if (AudioSystem::isLinearPCM(mFormat)) { 924 audioBuffer->format = AudioSystem::PCM_16_BIT; 925 } else { 926 audioBuffer->format = mFormat; 927 } 928 audioBuffer->raw = (int8_t *)cblk->buffer(u); 929 active = mActive; 930 return active ? status_t(NO_ERROR) : status_t(STOPPED); 931} 932 933void AudioTrack::releaseBuffer(Buffer* audioBuffer) 934{ 935 AutoMutex lock(mLock); 936 mCblk->stepUser(audioBuffer->frameCount); 937} 938 939// ------------------------------------------------------------------------- 940 941ssize_t AudioTrack::write(const void* buffer, size_t userSize) 942{ 943 944 if (mSharedBuffer != 0) return INVALID_OPERATION; 945 946 if (ssize_t(userSize) < 0) { 947 // sanity-check. user is most-likely passing an error code. 948 LOGE("AudioTrack::write(buffer=%p, size=%u (%d)", 949 buffer, userSize, userSize); 950 return BAD_VALUE; 951 } 952 953 LOGV("write %p: %d bytes, mActive=%d", this, userSize, mActive); 954 955 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 956 // while we are accessing the cblk 957 mLock.lock(); 958 sp <IAudioTrack> audioTrack = mAudioTrack; 959 sp <IMemory> iMem = mCblkMemory; 960 mLock.unlock(); 961 962 ssize_t written = 0; 963 const int8_t *src = (const int8_t *)buffer; 964 Buffer audioBuffer; 965 size_t frameSz = (size_t)frameSize(); 966 967 do { 968 audioBuffer.frameCount = userSize/frameSz; 969 970 // Calling obtainBuffer() with a negative wait count causes 971 // an (almost) infinite wait time. 972 status_t err = obtainBuffer(&audioBuffer, -1); 973 if (err < 0) { 974 // out of buffers, return #bytes written 975 if (err == status_t(NO_MORE_BUFFERS)) 976 break; 977 return ssize_t(err); 978 } 979 980 size_t toWrite; 981 982 if (mFormat == AudioSystem::PCM_8_BIT && !(mFlags & AudioSystem::OUTPUT_FLAG_DIRECT)) { 983 // Divide capacity by 2 to take expansion into account 984 toWrite = audioBuffer.size>>1; 985 // 8 to 16 bit conversion 986 int count = toWrite; 987 int16_t *dst = (int16_t *)(audioBuffer.i8); 988 while(count--) { 989 *dst++ = (int16_t)(*src++^0x80) << 8; 990 } 991 } else { 992 toWrite = audioBuffer.size; 993 memcpy(audioBuffer.i8, src, toWrite); 994 src += toWrite; 995 } 996 userSize -= toWrite; 997 written += toWrite; 998 999 releaseBuffer(&audioBuffer); 1000 } while (userSize >= frameSz); 1001 1002 return written; 1003} 1004 1005// ------------------------------------------------------------------------- 1006 1007bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 1008{ 1009 Buffer audioBuffer; 1010 uint32_t frames; 1011 size_t writtenSize; 1012 1013 mLock.lock(); 1014 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1015 // while we are accessing the cblk 1016 sp <IAudioTrack> audioTrack = mAudioTrack; 1017 sp <IMemory> iMem = mCblkMemory; 1018 audio_track_cblk_t* cblk = mCblk; 1019 mLock.unlock(); 1020 1021 // Manage underrun callback 1022 if (mActive && (cblk->framesReady() == 0)) { 1023 LOGV("Underrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags); 1024 AutoMutex _l(cblk->lock); 1025 if ((cblk->flags & CBLK_UNDERRUN_MSK) == CBLK_UNDERRUN_OFF) { 1026 cblk->flags |= CBLK_UNDERRUN_ON; 1027 cblk->lock.unlock(); 1028 mCbf(EVENT_UNDERRUN, mUserData, 0); 1029 if (cblk->server == cblk->frameCount) { 1030 mCbf(EVENT_BUFFER_END, mUserData, 0); 1031 } 1032 cblk->lock.lock(); 1033 if (mSharedBuffer != 0) return false; 1034 } 1035 } 1036 1037 // Manage loop end callback 1038 while (mLoopCount > cblk->loopCount) { 1039 int loopCount = -1; 1040 mLoopCount--; 1041 if (mLoopCount >= 0) loopCount = mLoopCount; 1042 1043 mCbf(EVENT_LOOP_END, mUserData, (void *)&loopCount); 1044 } 1045 1046 // Manage marker callback 1047 if (!mMarkerReached && (mMarkerPosition > 0)) { 1048 if (cblk->server >= mMarkerPosition) { 1049 mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition); 1050 mMarkerReached = true; 1051 } 1052 } 1053 1054 // Manage new position callback 1055 if (mUpdatePeriod > 0) { 1056 while (cblk->server >= mNewPosition) { 1057 mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition); 1058 mNewPosition += mUpdatePeriod; 1059 } 1060 } 1061 1062 // If Shared buffer is used, no data is requested from client. 1063 if (mSharedBuffer != 0) { 1064 frames = 0; 1065 } else { 1066 frames = mRemainingFrames; 1067 } 1068 1069 do { 1070 1071 audioBuffer.frameCount = frames; 1072 1073 // Calling obtainBuffer() with a wait count of 1 1074 // limits wait time to WAIT_PERIOD_MS. This prevents from being 1075 // stuck here not being able to handle timed events (position, markers, loops). 1076 status_t err = obtainBuffer(&audioBuffer, 1); 1077 if (err < NO_ERROR) { 1078 if (err != TIMED_OUT) { 1079 LOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up."); 1080 return false; 1081 } 1082 break; 1083 } 1084 if (err == status_t(STOPPED)) return false; 1085 1086 // Divide buffer size by 2 to take into account the expansion 1087 // due to 8 to 16 bit conversion: the callback must fill only half 1088 // of the destination buffer 1089 if (mFormat == AudioSystem::PCM_8_BIT && !(mFlags & AudioSystem::OUTPUT_FLAG_DIRECT)) { 1090 audioBuffer.size >>= 1; 1091 } 1092 1093 size_t reqSize = audioBuffer.size; 1094 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 1095 writtenSize = audioBuffer.size; 1096 1097 // Sanity check on returned size 1098 if (ssize_t(writtenSize) <= 0) { 1099 // The callback is done filling buffers 1100 // Keep this thread going to handle timed events and 1101 // still try to get more data in intervals of WAIT_PERIOD_MS 1102 // but don't just loop and block the CPU, so wait 1103 usleep(WAIT_PERIOD_MS*1000); 1104 break; 1105 } 1106 if (writtenSize > reqSize) writtenSize = reqSize; 1107 1108 if (mFormat == AudioSystem::PCM_8_BIT && !(mFlags & AudioSystem::OUTPUT_FLAG_DIRECT)) { 1109 // 8 to 16 bit conversion 1110 const int8_t *src = audioBuffer.i8 + writtenSize-1; 1111 int count = writtenSize; 1112 int16_t *dst = audioBuffer.i16 + writtenSize-1; 1113 while(count--) { 1114 *dst-- = (int16_t)(*src--^0x80) << 8; 1115 } 1116 writtenSize <<= 1; 1117 } 1118 1119 audioBuffer.size = writtenSize; 1120 // NOTE: mCblk->frameSize is not equal to AudioTrack::frameSize() for 1121 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sampel size of 1122 // 16 bit. 1123 audioBuffer.frameCount = writtenSize/mCblk->frameSize; 1124 1125 frames -= audioBuffer.frameCount; 1126 1127 releaseBuffer(&audioBuffer); 1128 } 1129 while (frames); 1130 1131 if (frames == 0) { 1132 mRemainingFrames = mNotificationFramesAct; 1133 } else { 1134 mRemainingFrames = frames; 1135 } 1136 return true; 1137} 1138 1139// must be called with mLock and cblk.lock held. Callers must also hold strong references on 1140// the IAudioTrack and IMemory in case they are recreated here. 1141// If the IAudioTrack is successfully restored, the cblk pointer is updated 1142status_t AudioTrack::restoreTrack_l(audio_track_cblk_t*& cblk, bool fromStart) 1143{ 1144 status_t result; 1145 1146 if (!(cblk->flags & CBLK_RESTORING_MSK)) { 1147 LOGW("dead IAudioTrack, creating a new one from %s", 1148 fromStart ? "start()" : "obtainBuffer()"); 1149 1150 cblk->flags |= CBLK_RESTORING_ON; 1151 // signal old cblk condition so that other threads waiting for available buffers stop 1152 // waiting now 1153 cblk->cv.broadcast(); 1154 cblk->lock.unlock(); 1155 1156 // if the new IAudioTrack is created, createTrack_l() will modify the 1157 // following member variables: mAudioTrack, mCblkMemory and mCblk. 1158 // It will also delete the strong references on previous IAudioTrack and IMemory 1159 result = createTrack_l(mStreamType, 1160 cblk->sampleRate, 1161 mFormat, 1162 mChannelCount, 1163 mFrameCount, 1164 mFlags, 1165 mSharedBuffer, 1166 getOutput_l(), 1167 false); 1168 1169 if (result == NO_ERROR) { 1170 if (!fromStart) { 1171 mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1172 } 1173 result = mAudioTrack->start(); 1174 if (fromStart && result == NO_ERROR) { 1175 mNewPosition = mCblk->server + mUpdatePeriod; 1176 } 1177 } 1178 if (result != NO_ERROR) { 1179 mActive = false; 1180 } 1181 1182 // signal old cblk condition for other threads waiting for restore completion 1183 cblk->lock.lock(); 1184 cblk->flags |= CBLK_RESTORED_MSK; 1185 cblk->cv.broadcast(); 1186 cblk->lock.unlock(); 1187 } else { 1188 if (!(cblk->flags & CBLK_RESTORED_MSK)) { 1189 LOGW("dead IAudioTrack, waiting for a new one"); 1190 mLock.unlock(); 1191 result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS)); 1192 cblk->lock.unlock(); 1193 mLock.lock(); 1194 } else { 1195 LOGW("dead IAudioTrack, already restored"); 1196 result = NO_ERROR; 1197 cblk->lock.unlock(); 1198 } 1199 if (result != NO_ERROR || mActive == 0) { 1200 result = status_t(STOPPED); 1201 } 1202 } 1203 LOGV("restoreTrack_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x", 1204 result, mActive, mCblk, cblk, mCblk->flags, cblk->flags); 1205 1206 if (result == NO_ERROR) { 1207 // from now on we switch to the newly created cblk 1208 cblk = mCblk; 1209 } 1210 cblk->lock.lock(); 1211 1212 LOGW_IF(result != NO_ERROR, "restoreTrack_l() error %d", result); 1213 1214 return result; 1215} 1216 1217status_t AudioTrack::dump(int fd, const Vector<String16>& args) const 1218{ 1219 1220 const size_t SIZE = 256; 1221 char buffer[SIZE]; 1222 String8 result; 1223 1224 result.append(" AudioTrack::dump\n"); 1225 snprintf(buffer, 255, " stream type(%d), left - right volume(%f, %f)\n", mStreamType, mVolume[0], mVolume[1]); 1226 result.append(buffer); 1227 snprintf(buffer, 255, " format(%d), channel count(%d), frame count(%d)\n", mFormat, mChannelCount, mCblk->frameCount); 1228 result.append(buffer); 1229 snprintf(buffer, 255, " sample rate(%d), status(%d), muted(%d)\n", (mCblk == 0) ? 0 : mCblk->sampleRate, mStatus, mMuted); 1230 result.append(buffer); 1231 snprintf(buffer, 255, " active(%d), latency (%d)\n", mActive, mLatency); 1232 result.append(buffer); 1233 ::write(fd, result.string(), result.size()); 1234 return NO_ERROR; 1235} 1236 1237// ========================================================================= 1238 1239AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava) 1240 : Thread(bCanCallJava), mReceiver(receiver) 1241{ 1242} 1243 1244bool AudioTrack::AudioTrackThread::threadLoop() 1245{ 1246 return mReceiver.processAudioBuffer(this); 1247} 1248 1249status_t AudioTrack::AudioTrackThread::readyToRun() 1250{ 1251 return NO_ERROR; 1252} 1253 1254void AudioTrack::AudioTrackThread::onFirstRef() 1255{ 1256} 1257 1258// ========================================================================= 1259 1260audio_track_cblk_t::audio_track_cblk_t() 1261 : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0), 1262 userBase(0), serverBase(0), buffers(0), frameCount(0), 1263 loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), volumeLR(0), 1264 flags(0), sendLevel(0) 1265{ 1266} 1267 1268uint32_t audio_track_cblk_t::stepUser(uint32_t frameCount) 1269{ 1270 uint32_t u = this->user; 1271 1272 u += frameCount; 1273 // Ensure that user is never ahead of server for AudioRecord 1274 if (flags & CBLK_DIRECTION_MSK) { 1275 // If stepServer() has been called once, switch to normal obtainBuffer() timeout period 1276 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) { 1277 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1278 } 1279 } else if (u > this->server) { 1280 LOGW("stepServer occured after track reset"); 1281 u = this->server; 1282 } 1283 1284 if (u >= userBase + this->frameCount) { 1285 userBase += this->frameCount; 1286 } 1287 1288 this->user = u; 1289 1290 // Clear flow control error condition as new data has been written/read to/from buffer. 1291 if (flags & CBLK_UNDERRUN_MSK) { 1292 AutoMutex _l(lock); 1293 if (flags & CBLK_UNDERRUN_MSK) { 1294 flags &= ~CBLK_UNDERRUN_MSK; 1295 } 1296 } 1297 1298 return u; 1299} 1300 1301bool audio_track_cblk_t::stepServer(uint32_t frameCount) 1302{ 1303 // the code below simulates lock-with-timeout 1304 // we MUST do this to protect the AudioFlinger server 1305 // as this lock is shared with the client. 1306 status_t err; 1307 1308 err = lock.tryLock(); 1309 if (err == -EBUSY) { // just wait a bit 1310 usleep(1000); 1311 err = lock.tryLock(); 1312 } 1313 if (err != NO_ERROR) { 1314 // probably, the client just died. 1315 return false; 1316 } 1317 1318 uint32_t s = this->server; 1319 1320 s += frameCount; 1321 if (flags & CBLK_DIRECTION_MSK) { 1322 // Mark that we have read the first buffer so that next time stepUser() is called 1323 // we switch to normal obtainBuffer() timeout period 1324 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) { 1325 bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1; 1326 } 1327 // It is possible that we receive a flush() 1328 // while the mixer is processing a block: in this case, 1329 // stepServer() is called After the flush() has reset u & s and 1330 // we have s > u 1331 if (s > this->user) { 1332 LOGW("stepServer occured after track reset"); 1333 s = this->user; 1334 } 1335 } 1336 1337 if (s >= loopEnd) { 1338 LOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd); 1339 s = loopStart; 1340 if (--loopCount == 0) { 1341 loopEnd = UINT_MAX; 1342 loopStart = UINT_MAX; 1343 } 1344 } 1345 if (s >= serverBase + this->frameCount) { 1346 serverBase += this->frameCount; 1347 } 1348 1349 this->server = s; 1350 1351 if (!(flags & CBLK_INVALID_MSK)) { 1352 cv.signal(); 1353 } 1354 lock.unlock(); 1355 return true; 1356} 1357 1358void* audio_track_cblk_t::buffer(uint32_t offset) const 1359{ 1360 return (int8_t *)this->buffers + (offset - userBase) * this->frameSize; 1361} 1362 1363uint32_t audio_track_cblk_t::framesAvailable() 1364{ 1365 Mutex::Autolock _l(lock); 1366 return framesAvailable_l(); 1367} 1368 1369uint32_t audio_track_cblk_t::framesAvailable_l() 1370{ 1371 uint32_t u = this->user; 1372 uint32_t s = this->server; 1373 1374 if (flags & CBLK_DIRECTION_MSK) { 1375 uint32_t limit = (s < loopStart) ? s : loopStart; 1376 return limit + frameCount - u; 1377 } else { 1378 return frameCount + u - s; 1379 } 1380} 1381 1382uint32_t audio_track_cblk_t::framesReady() 1383{ 1384 uint32_t u = this->user; 1385 uint32_t s = this->server; 1386 1387 if (flags & CBLK_DIRECTION_MSK) { 1388 if (u < loopEnd) { 1389 return u - s; 1390 } else { 1391 Mutex::Autolock _l(lock); 1392 if (loopCount >= 0) { 1393 return (loopEnd - loopStart)*loopCount + u - s; 1394 } else { 1395 return UINT_MAX; 1396 } 1397 } 1398 } else { 1399 return s - u; 1400 } 1401} 1402 1403// ------------------------------------------------------------------------- 1404 1405}; // namespace android 1406 1407