AudioTrack.cpp revision cd07594333cbe8b2c86c6609cce01a74d6cc33f8
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#include <utils/Atomic.h> 39 40#include <cutils/bitops.h> 41 42#include <system/audio.h> 43#include <system/audio_policy.h> 44 45#define LIKELY( exp ) (__builtin_expect( (exp) != 0, true )) 46#define UNLIKELY( exp ) (__builtin_expect( (exp) != 0, false )) 47 48namespace android { 49// --------------------------------------------------------------------------- 50 51// static 52status_t AudioTrack::getMinFrameCount( 53 int* frameCount, 54 int streamType, 55 uint32_t sampleRate) 56{ 57 int afSampleRate; 58 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 59 return NO_INIT; 60 } 61 int afFrameCount; 62 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 63 return NO_INIT; 64 } 65 uint32_t afLatency; 66 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 67 return NO_INIT; 68 } 69 70 // Ensure that buffer depth covers at least audio hardware latency 71 uint32_t minBufCount = afLatency / ((1000 * afFrameCount) / afSampleRate); 72 if (minBufCount < 2) minBufCount = 2; 73 74 *frameCount = (sampleRate == 0) ? afFrameCount * minBufCount : 75 afFrameCount * minBufCount * sampleRate / afSampleRate; 76 return NO_ERROR; 77} 78 79// --------------------------------------------------------------------------- 80 81AudioTrack::AudioTrack() 82 : mStatus(NO_INIT) 83{ 84} 85 86AudioTrack::AudioTrack( 87 int streamType, 88 uint32_t sampleRate, 89 int format, 90 int channelMask, 91 int frameCount, 92 uint32_t flags, 93 callback_t cbf, 94 void* user, 95 int notificationFrames, 96 int sessionId) 97 : mStatus(NO_INIT) 98{ 99 mStatus = set(streamType, sampleRate, format, channelMask, 100 frameCount, flags, cbf, user, notificationFrames, 101 0, false, sessionId); 102} 103 104AudioTrack::AudioTrack( 105 int streamType, 106 uint32_t sampleRate, 107 int format, 108 int channelMask, 109 const sp<IMemory>& sharedBuffer, 110 uint32_t flags, 111 callback_t cbf, 112 void* user, 113 int notificationFrames, 114 int sessionId) 115 : mStatus(NO_INIT) 116{ 117 mStatus = set(streamType, sampleRate, format, channelMask, 118 0, flags, cbf, user, notificationFrames, 119 sharedBuffer, false, sessionId); 120} 121 122AudioTrack::~AudioTrack() 123{ 124 LOGV_IF(mSharedBuffer != 0, "Destructor sharedBuffer: %p", mSharedBuffer->pointer()); 125 126 if (mStatus == NO_ERROR) { 127 // Make sure that callback function exits in the case where 128 // it is looping on buffer full condition in obtainBuffer(). 129 // Otherwise the callback thread will never exit. 130 stop(); 131 if (mAudioTrackThread != 0) { 132 mAudioTrackThread->requestExitAndWait(); 133 mAudioTrackThread.clear(); 134 } 135 mAudioTrack.clear(); 136 IPCThreadState::self()->flushCommands(); 137 AudioSystem::releaseAudioSessionId(mSessionId); 138 } 139} 140 141status_t AudioTrack::set( 142 int streamType, 143 uint32_t sampleRate, 144 int format, 145 int channelMask, 146 int frameCount, 147 uint32_t flags, 148 callback_t cbf, 149 void* user, 150 int notificationFrames, 151 const sp<IMemory>& sharedBuffer, 152 bool threadCanCallJava, 153 int sessionId) 154{ 155 156 LOGV_IF(sharedBuffer != 0, "sharedBuffer: %p, size: %d", sharedBuffer->pointer(), sharedBuffer->size()); 157 158 AutoMutex lock(mLock); 159 if (mAudioTrack != 0) { 160 LOGE("Track already in use"); 161 return INVALID_OPERATION; 162 } 163 164 int afSampleRate; 165 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 166 return NO_INIT; 167 } 168 uint32_t afLatency; 169 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 170 return NO_INIT; 171 } 172 173 // handle default values first. 174 if (streamType == AUDIO_STREAM_DEFAULT) { 175 streamType = AUDIO_STREAM_MUSIC; 176 } 177 if (sampleRate == 0) { 178 sampleRate = afSampleRate; 179 } 180 // these below should probably come from the audioFlinger too... 181 if (format == 0) { 182 format = AUDIO_FORMAT_PCM_16_BIT; 183 } 184 if (channelMask == 0) { 185 channelMask = AUDIO_CHANNEL_OUT_STEREO; 186 } 187 188 // validate parameters 189 if (!audio_is_valid_format(format)) { 190 LOGE("Invalid format"); 191 return BAD_VALUE; 192 } 193 194 // force direct flag if format is not linear PCM 195 if (!audio_is_linear_pcm(format)) { 196 flags |= AUDIO_POLICY_OUTPUT_FLAG_DIRECT; 197 } 198 199 if (!audio_is_output_channel(channelMask)) { 200 LOGE("Invalid channel mask"); 201 return BAD_VALUE; 202 } 203 uint32_t channelCount = popcount(channelMask); 204 205 audio_io_handle_t output = AudioSystem::getOutput( 206 (audio_stream_type_t)streamType, 207 sampleRate,format, channelMask, 208 (audio_policy_output_flags_t)flags); 209 210 if (output == 0) { 211 LOGE("Could not get audio output for stream type %d", streamType); 212 return BAD_VALUE; 213 } 214 215 mVolume[LEFT] = 1.0f; 216 mVolume[RIGHT] = 1.0f; 217 mSendLevel = 0; 218 mFrameCount = frameCount; 219 mNotificationFramesReq = notificationFrames; 220 mSessionId = sessionId; 221 mAuxEffectId = 0; 222 223 // create the IAudioTrack 224 status_t status = createTrack_l(streamType, 225 sampleRate, 226 (uint32_t)format, 227 (uint32_t)channelMask, 228 frameCount, 229 flags, 230 sharedBuffer, 231 output, 232 true); 233 234 if (status != NO_ERROR) { 235 return status; 236 } 237 238 if (cbf != 0) { 239 mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava); 240 if (mAudioTrackThread == 0) { 241 LOGE("Could not create callback thread"); 242 return NO_INIT; 243 } 244 } 245 246 mStatus = NO_ERROR; 247 248 mStreamType = streamType; 249 mFormat = (uint32_t)format; 250 mChannelMask = (uint32_t)channelMask; 251 mChannelCount = channelCount; 252 mSharedBuffer = sharedBuffer; 253 mMuted = false; 254 mActive = 0; 255 mCbf = cbf; 256 mUserData = user; 257 mLoopCount = 0; 258 mMarkerPosition = 0; 259 mMarkerReached = false; 260 mNewPosition = 0; 261 mUpdatePeriod = 0; 262 mFlushed = false; 263 mFlags = flags; 264 AudioSystem::acquireAudioSessionId(mSessionId); 265 266 return NO_ERROR; 267} 268 269status_t AudioTrack::initCheck() const 270{ 271 return mStatus; 272} 273 274// ------------------------------------------------------------------------- 275 276uint32_t AudioTrack::latency() const 277{ 278 return mLatency; 279} 280 281int AudioTrack::streamType() const 282{ 283 return mStreamType; 284} 285 286int AudioTrack::format() const 287{ 288 return mFormat; 289} 290 291int AudioTrack::channelCount() const 292{ 293 return mChannelCount; 294} 295 296uint32_t AudioTrack::frameCount() const 297{ 298 return mCblk->frameCount; 299} 300 301int AudioTrack::frameSize() const 302{ 303 if (audio_is_linear_pcm(mFormat)) { 304 return channelCount()*audio_bytes_per_sample(mFormat); 305 } else { 306 return sizeof(uint8_t); 307 } 308} 309 310sp<IMemory>& AudioTrack::sharedBuffer() 311{ 312 return mSharedBuffer; 313} 314 315// ------------------------------------------------------------------------- 316 317void AudioTrack::start() 318{ 319 sp<AudioTrackThread> t = mAudioTrackThread; 320 status_t status = NO_ERROR; 321 322 LOGV("start %p", this); 323 if (t != 0) { 324 if (t->exitPending()) { 325 if (t->requestExitAndWait() == WOULD_BLOCK) { 326 LOGE("AudioTrack::start called from thread"); 327 return; 328 } 329 } 330 t->mLock.lock(); 331 } 332 333 AutoMutex lock(mLock); 334 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 335 // while we are accessing the cblk 336 sp <IAudioTrack> audioTrack = mAudioTrack; 337 sp <IMemory> iMem = mCblkMemory; 338 audio_track_cblk_t* cblk = mCblk; 339 340 if (mActive == 0) { 341 mFlushed = false; 342 mActive = 1; 343 mNewPosition = cblk->server + mUpdatePeriod; 344 cblk->lock.lock(); 345 cblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 346 cblk->waitTimeMs = 0; 347 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 348 if (t != 0) { 349 t->run("AudioTrackThread", ANDROID_PRIORITY_AUDIO); 350 } else { 351 setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_AUDIO); 352 } 353 354 LOGV("start %p before lock cblk %p", this, mCblk); 355 if (!(cblk->flags & CBLK_INVALID_MSK)) { 356 cblk->lock.unlock(); 357 status = mAudioTrack->start(); 358 cblk->lock.lock(); 359 if (status == DEAD_OBJECT) { 360 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 361 } 362 } 363 if (cblk->flags & CBLK_INVALID_MSK) { 364 status = restoreTrack_l(cblk, true); 365 } 366 cblk->lock.unlock(); 367 if (status != NO_ERROR) { 368 LOGV("start() failed"); 369 mActive = 0; 370 if (t != 0) { 371 t->requestExit(); 372 } else { 373 setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_NORMAL); 374 } 375 } 376 } 377 378 if (t != 0) { 379 t->mLock.unlock(); 380 } 381} 382 383void AudioTrack::stop() 384{ 385 sp<AudioTrackThread> t = mAudioTrackThread; 386 387 LOGV("stop %p", this); 388 if (t != 0) { 389 t->mLock.lock(); 390 } 391 392 AutoMutex lock(mLock); 393 if (mActive == 1) { 394 mActive = 0; 395 mCblk->cv.signal(); 396 mAudioTrack->stop(); 397 // Cancel loops (If we are in the middle of a loop, playback 398 // would not stop until loopCount reaches 0). 399 setLoop_l(0, 0, 0); 400 // the playback head position will reset to 0, so if a marker is set, we need 401 // to activate it again 402 mMarkerReached = false; 403 // Force flush if a shared buffer is used otherwise audioflinger 404 // will not stop before end of buffer is reached. 405 if (mSharedBuffer != 0) { 406 flush_l(); 407 } 408 if (t != 0) { 409 t->requestExit(); 410 } else { 411 setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_NORMAL); 412 } 413 } 414 415 if (t != 0) { 416 t->mLock.unlock(); 417 } 418} 419 420bool AudioTrack::stopped() const 421{ 422 return !mActive; 423} 424 425void AudioTrack::flush() 426{ 427 AutoMutex lock(mLock); 428 flush_l(); 429} 430 431// must be called with mLock held 432void AudioTrack::flush_l() 433{ 434 LOGV("flush"); 435 436 // clear playback marker and periodic update counter 437 mMarkerPosition = 0; 438 mMarkerReached = false; 439 mUpdatePeriod = 0; 440 441 if (!mActive) { 442 mFlushed = true; 443 mAudioTrack->flush(); 444 // Release AudioTrack callback thread in case it was waiting for new buffers 445 // in AudioTrack::obtainBuffer() 446 mCblk->cv.signal(); 447 } 448} 449 450void AudioTrack::pause() 451{ 452 LOGV("pause"); 453 AutoMutex lock(mLock); 454 if (mActive == 1) { 455 mActive = 0; 456 mAudioTrack->pause(); 457 } 458} 459 460void AudioTrack::mute(bool e) 461{ 462 mAudioTrack->mute(e); 463 mMuted = e; 464} 465 466bool AudioTrack::muted() const 467{ 468 return mMuted; 469} 470 471status_t AudioTrack::setVolume(float left, float right) 472{ 473 if (left > 1.0f || right > 1.0f) { 474 return BAD_VALUE; 475 } 476 477 AutoMutex lock(mLock); 478 mVolume[LEFT] = left; 479 mVolume[RIGHT] = right; 480 481 // write must be atomic 482 mCblk->volumeLR = (uint32_t(uint16_t(right * 0x1000)) << 16) | uint16_t(left * 0x1000); 483 484 return NO_ERROR; 485} 486 487void AudioTrack::getVolume(float* left, float* right) 488{ 489 if (left != NULL) { 490 *left = mVolume[LEFT]; 491 } 492 if (right != NULL) { 493 *right = mVolume[RIGHT]; 494 } 495} 496 497status_t AudioTrack::setAuxEffectSendLevel(float level) 498{ 499 LOGV("setAuxEffectSendLevel(%f)", level); 500 if (level > 1.0f) { 501 return BAD_VALUE; 502 } 503 AutoMutex lock(mLock); 504 505 mSendLevel = level; 506 507 mCblk->sendLevel = uint16_t(level * 0x1000); 508 509 return NO_ERROR; 510} 511 512void AudioTrack::getAuxEffectSendLevel(float* level) 513{ 514 if (level != NULL) { 515 *level = mSendLevel; 516 } 517} 518 519status_t AudioTrack::setSampleRate(int rate) 520{ 521 int afSamplingRate; 522 523 if (AudioSystem::getOutputSamplingRate(&afSamplingRate, mStreamType) != NO_ERROR) { 524 return NO_INIT; 525 } 526 // Resampler implementation limits input sampling rate to 2 x output sampling rate. 527 if (rate <= 0 || rate > afSamplingRate*2 ) return BAD_VALUE; 528 529 AutoMutex lock(mLock); 530 mCblk->sampleRate = rate; 531 return NO_ERROR; 532} 533 534uint32_t AudioTrack::getSampleRate() 535{ 536 AutoMutex lock(mLock); 537 return mCblk->sampleRate; 538} 539 540status_t AudioTrack::setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount) 541{ 542 AutoMutex lock(mLock); 543 return setLoop_l(loopStart, loopEnd, loopCount); 544} 545 546// must be called with mLock held 547status_t AudioTrack::setLoop_l(uint32_t loopStart, uint32_t loopEnd, int loopCount) 548{ 549 audio_track_cblk_t* cblk = mCblk; 550 551 Mutex::Autolock _l(cblk->lock); 552 553 if (loopCount == 0) { 554 cblk->loopStart = UINT_MAX; 555 cblk->loopEnd = UINT_MAX; 556 cblk->loopCount = 0; 557 mLoopCount = 0; 558 return NO_ERROR; 559 } 560 561 if (loopStart >= loopEnd || 562 loopEnd - loopStart > cblk->frameCount || 563 cblk->server > loopStart) { 564 LOGE("setLoop invalid value: loopStart %d, loopEnd %d, loopCount %d, framecount %d, user %d", loopStart, loopEnd, loopCount, cblk->frameCount, cblk->user); 565 return BAD_VALUE; 566 } 567 568 if ((mSharedBuffer != 0) && (loopEnd > cblk->frameCount)) { 569 LOGE("setLoop invalid value: loop markers beyond data: loopStart %d, loopEnd %d, framecount %d", 570 loopStart, loopEnd, cblk->frameCount); 571 return BAD_VALUE; 572 } 573 574 cblk->loopStart = loopStart; 575 cblk->loopEnd = loopEnd; 576 cblk->loopCount = loopCount; 577 mLoopCount = loopCount; 578 579 return NO_ERROR; 580} 581 582status_t AudioTrack::getLoop(uint32_t *loopStart, uint32_t *loopEnd, int *loopCount) 583{ 584 AutoMutex lock(mLock); 585 if (loopStart != 0) { 586 *loopStart = mCblk->loopStart; 587 } 588 if (loopEnd != 0) { 589 *loopEnd = mCblk->loopEnd; 590 } 591 if (loopCount != 0) { 592 if (mCblk->loopCount < 0) { 593 *loopCount = -1; 594 } else { 595 *loopCount = mCblk->loopCount; 596 } 597 } 598 599 return NO_ERROR; 600} 601 602status_t AudioTrack::setMarkerPosition(uint32_t marker) 603{ 604 if (mCbf == 0) return INVALID_OPERATION; 605 606 mMarkerPosition = marker; 607 mMarkerReached = false; 608 609 return NO_ERROR; 610} 611 612status_t AudioTrack::getMarkerPosition(uint32_t *marker) 613{ 614 if (marker == 0) return BAD_VALUE; 615 616 *marker = mMarkerPosition; 617 618 return NO_ERROR; 619} 620 621status_t AudioTrack::setPositionUpdatePeriod(uint32_t updatePeriod) 622{ 623 if (mCbf == 0) return INVALID_OPERATION; 624 625 uint32_t curPosition; 626 getPosition(&curPosition); 627 mNewPosition = curPosition + updatePeriod; 628 mUpdatePeriod = updatePeriod; 629 630 return NO_ERROR; 631} 632 633status_t AudioTrack::getPositionUpdatePeriod(uint32_t *updatePeriod) 634{ 635 if (updatePeriod == 0) return BAD_VALUE; 636 637 *updatePeriod = mUpdatePeriod; 638 639 return NO_ERROR; 640} 641 642status_t AudioTrack::setPosition(uint32_t position) 643{ 644 AutoMutex lock(mLock); 645 Mutex::Autolock _l(mCblk->lock); 646 647 if (!stopped()) return INVALID_OPERATION; 648 649 if (position > mCblk->user) return BAD_VALUE; 650 651 mCblk->server = position; 652 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 653 654 return NO_ERROR; 655} 656 657status_t AudioTrack::getPosition(uint32_t *position) 658{ 659 if (position == 0) return BAD_VALUE; 660 AutoMutex lock(mLock); 661 *position = mFlushed ? 0 : mCblk->server; 662 663 return NO_ERROR; 664} 665 666status_t AudioTrack::reload() 667{ 668 AutoMutex lock(mLock); 669 670 if (!stopped()) return INVALID_OPERATION; 671 672 flush_l(); 673 674 mCblk->stepUser(mCblk->frameCount); 675 676 return NO_ERROR; 677} 678 679audio_io_handle_t AudioTrack::getOutput() 680{ 681 AutoMutex lock(mLock); 682 return getOutput_l(); 683} 684 685// must be called with mLock held 686audio_io_handle_t AudioTrack::getOutput_l() 687{ 688 return AudioSystem::getOutput((audio_stream_type_t)mStreamType, 689 mCblk->sampleRate, mFormat, mChannelMask, (audio_policy_output_flags_t)mFlags); 690} 691 692int AudioTrack::getSessionId() 693{ 694 return mSessionId; 695} 696 697status_t AudioTrack::attachAuxEffect(int effectId) 698{ 699 LOGV("attachAuxEffect(%d)", effectId); 700 status_t status = mAudioTrack->attachAuxEffect(effectId); 701 if (status == NO_ERROR) { 702 mAuxEffectId = effectId; 703 } 704 return status; 705} 706 707// ------------------------------------------------------------------------- 708 709// must be called with mLock held 710status_t AudioTrack::createTrack_l( 711 int streamType, 712 uint32_t sampleRate, 713 uint32_t format, 714 uint32_t channelMask, 715 int frameCount, 716 uint32_t flags, 717 const sp<IMemory>& sharedBuffer, 718 audio_io_handle_t output, 719 bool enforceFrameCount) 720{ 721 status_t status; 722 const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger(); 723 if (audioFlinger == 0) { 724 LOGE("Could not get audioflinger"); 725 return NO_INIT; 726 } 727 728 int afSampleRate; 729 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 730 return NO_INIT; 731 } 732 int afFrameCount; 733 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 734 return NO_INIT; 735 } 736 uint32_t afLatency; 737 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 738 return NO_INIT; 739 } 740 741 mNotificationFramesAct = mNotificationFramesReq; 742 if (!audio_is_linear_pcm(format)) { 743 if (sharedBuffer != 0) { 744 frameCount = sharedBuffer->size(); 745 } 746 } else { 747 // Ensure that buffer depth covers at least audio hardware latency 748 uint32_t minBufCount = afLatency / ((1000 * afFrameCount)/afSampleRate); 749 if (minBufCount < 2) minBufCount = 2; 750 751 int minFrameCount = (afFrameCount*sampleRate*minBufCount)/afSampleRate; 752 753 if (sharedBuffer == 0) { 754 if (frameCount == 0) { 755 frameCount = minFrameCount; 756 } 757 if (mNotificationFramesAct == 0) { 758 mNotificationFramesAct = frameCount/2; 759 } 760 // Make sure that application is notified with sufficient margin 761 // before underrun 762 if (mNotificationFramesAct > (uint32_t)frameCount/2) { 763 mNotificationFramesAct = frameCount/2; 764 } 765 if (frameCount < minFrameCount) { 766 if (enforceFrameCount) { 767 LOGE("Invalid buffer size: minFrameCount %d, frameCount %d", minFrameCount, frameCount); 768 return BAD_VALUE; 769 } else { 770 frameCount = minFrameCount; 771 } 772 } 773 } else { 774 // Ensure that buffer alignment matches channelcount 775 int channelCount = popcount(channelMask); 776 if (((uint32_t)sharedBuffer->pointer() & (channelCount | 1)) != 0) { 777 LOGE("Invalid buffer alignement: address %p, channelCount %d", sharedBuffer->pointer(), channelCount); 778 return BAD_VALUE; 779 } 780 frameCount = sharedBuffer->size()/channelCount/sizeof(int16_t); 781 } 782 } 783 784 sp<IAudioTrack> track = audioFlinger->createTrack(getpid(), 785 streamType, 786 sampleRate, 787 format, 788 channelMask, 789 frameCount, 790 ((uint16_t)flags) << 16, 791 sharedBuffer, 792 output, 793 &mSessionId, 794 &status); 795 796 if (track == 0) { 797 LOGE("AudioFlinger could not create track, status: %d", status); 798 return status; 799 } 800 sp<IMemory> cblk = track->getCblk(); 801 if (cblk == 0) { 802 LOGE("Could not get control block"); 803 return NO_INIT; 804 } 805 mAudioTrack.clear(); 806 mAudioTrack = track; 807 mCblkMemory.clear(); 808 mCblkMemory = cblk; 809 mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer()); 810 android_atomic_or(CBLK_DIRECTION_OUT, &mCblk->flags); 811 if (sharedBuffer == 0) { 812 mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t); 813 } else { 814 mCblk->buffers = sharedBuffer->pointer(); 815 // Force buffer full condition as data is already present in shared memory 816 mCblk->stepUser(mCblk->frameCount); 817 } 818 819 mCblk->volumeLR = (uint32_t(uint16_t(mVolume[RIGHT] * 0x1000)) << 16) | uint16_t(mVolume[LEFT] * 0x1000); 820 mCblk->sendLevel = uint16_t(mSendLevel * 0x1000); 821 mAudioTrack->attachAuxEffect(mAuxEffectId); 822 mCblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 823 mCblk->waitTimeMs = 0; 824 mRemainingFrames = mNotificationFramesAct; 825 mLatency = afLatency + (1000*mCblk->frameCount) / sampleRate; 826 return NO_ERROR; 827} 828 829status_t AudioTrack::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 830{ 831 AutoMutex lock(mLock); 832 int active; 833 status_t result = NO_ERROR; 834 audio_track_cblk_t* cblk = mCblk; 835 uint32_t framesReq = audioBuffer->frameCount; 836 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 837 838 audioBuffer->frameCount = 0; 839 audioBuffer->size = 0; 840 841 uint32_t framesAvail = cblk->framesAvailable(); 842 843 cblk->lock.lock(); 844 if (cblk->flags & CBLK_INVALID_MSK) { 845 goto create_new_track; 846 } 847 cblk->lock.unlock(); 848 849 if (framesAvail == 0) { 850 cblk->lock.lock(); 851 goto start_loop_here; 852 while (framesAvail == 0) { 853 active = mActive; 854 if (UNLIKELY(!active)) { 855 LOGV("Not active and NO_MORE_BUFFERS"); 856 cblk->lock.unlock(); 857 return NO_MORE_BUFFERS; 858 } 859 if (UNLIKELY(!waitCount)) { 860 cblk->lock.unlock(); 861 return WOULD_BLOCK; 862 } 863 if (!(cblk->flags & CBLK_INVALID_MSK)) { 864 mLock.unlock(); 865 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 866 cblk->lock.unlock(); 867 mLock.lock(); 868 if (mActive == 0) { 869 return status_t(STOPPED); 870 } 871 cblk->lock.lock(); 872 } 873 874 if (cblk->flags & CBLK_INVALID_MSK) { 875 goto create_new_track; 876 } 877 if (__builtin_expect(result!=NO_ERROR, false)) { 878 cblk->waitTimeMs += waitTimeMs; 879 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 880 // timing out when a loop has been set and we have already written upto loop end 881 // is a normal condition: no need to wake AudioFlinger up. 882 if (cblk->user < cblk->loopEnd) { 883 LOGW( "obtainBuffer timed out (is the CPU pegged?) %p " 884 "user=%08x, server=%08x", this, cblk->user, cblk->server); 885 //unlock cblk mutex before calling mAudioTrack->start() (see issue #1617140) 886 cblk->lock.unlock(); 887 result = mAudioTrack->start(); 888 cblk->lock.lock(); 889 if (result == DEAD_OBJECT) { 890 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 891create_new_track: 892 result = restoreTrack_l(cblk, false); 893 } 894 if (result != NO_ERROR) { 895 LOGW("obtainBuffer create Track error %d", result); 896 cblk->lock.unlock(); 897 return result; 898 } 899 } 900 cblk->waitTimeMs = 0; 901 } 902 903 if (--waitCount == 0) { 904 cblk->lock.unlock(); 905 return TIMED_OUT; 906 } 907 } 908 // read the server count again 909 start_loop_here: 910 framesAvail = cblk->framesAvailable_l(); 911 } 912 cblk->lock.unlock(); 913 } 914 915 // restart track if it was disabled by audioflinger due to previous underrun 916 if (mActive && (cblk->flags & CBLK_DISABLED_MSK)) { 917 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 918 LOGW("obtainBuffer() track %p disabled, restarting", this); 919 mAudioTrack->start(); 920 } 921 922 cblk->waitTimeMs = 0; 923 924 if (framesReq > framesAvail) { 925 framesReq = framesAvail; 926 } 927 928 uint32_t u = cblk->user; 929 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 930 931 if (u + framesReq > bufferEnd) { 932 framesReq = bufferEnd - u; 933 } 934 935 audioBuffer->flags = mMuted ? Buffer::MUTE : 0; 936 audioBuffer->channelCount = mChannelCount; 937 audioBuffer->frameCount = framesReq; 938 audioBuffer->size = framesReq * cblk->frameSize; 939 if (audio_is_linear_pcm(mFormat)) { 940 audioBuffer->format = AUDIO_FORMAT_PCM_16_BIT; 941 } else { 942 audioBuffer->format = mFormat; 943 } 944 audioBuffer->raw = (int8_t *)cblk->buffer(u); 945 active = mActive; 946 return active ? status_t(NO_ERROR) : status_t(STOPPED); 947} 948 949void AudioTrack::releaseBuffer(Buffer* audioBuffer) 950{ 951 AutoMutex lock(mLock); 952 mCblk->stepUser(audioBuffer->frameCount); 953} 954 955// ------------------------------------------------------------------------- 956 957ssize_t AudioTrack::write(const void* buffer, size_t userSize) 958{ 959 960 if (mSharedBuffer != 0) return INVALID_OPERATION; 961 962 if (ssize_t(userSize) < 0) { 963 // sanity-check. user is most-likely passing an error code. 964 LOGE("AudioTrack::write(buffer=%p, size=%u (%d)", 965 buffer, userSize, userSize); 966 return BAD_VALUE; 967 } 968 969 LOGV("write %p: %d bytes, mActive=%d", this, userSize, mActive); 970 971 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 972 // while we are accessing the cblk 973 mLock.lock(); 974 sp <IAudioTrack> audioTrack = mAudioTrack; 975 sp <IMemory> iMem = mCblkMemory; 976 mLock.unlock(); 977 978 ssize_t written = 0; 979 const int8_t *src = (const int8_t *)buffer; 980 Buffer audioBuffer; 981 size_t frameSz = (size_t)frameSize(); 982 983 do { 984 audioBuffer.frameCount = userSize/frameSz; 985 986 // Calling obtainBuffer() with a negative wait count causes 987 // an (almost) infinite wait time. 988 status_t err = obtainBuffer(&audioBuffer, -1); 989 if (err < 0) { 990 // out of buffers, return #bytes written 991 if (err == status_t(NO_MORE_BUFFERS)) 992 break; 993 return ssize_t(err); 994 } 995 996 size_t toWrite; 997 998 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 999 // Divide capacity by 2 to take expansion into account 1000 toWrite = audioBuffer.size>>1; 1001 // 8 to 16 bit conversion 1002 int count = toWrite; 1003 int16_t *dst = (int16_t *)(audioBuffer.i8); 1004 while(count--) { 1005 *dst++ = (int16_t)(*src++^0x80) << 8; 1006 } 1007 } else { 1008 toWrite = audioBuffer.size; 1009 memcpy(audioBuffer.i8, src, toWrite); 1010 src += toWrite; 1011 } 1012 userSize -= toWrite; 1013 written += toWrite; 1014 1015 releaseBuffer(&audioBuffer); 1016 } while (userSize >= frameSz); 1017 1018 return written; 1019} 1020 1021// ------------------------------------------------------------------------- 1022 1023bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 1024{ 1025 Buffer audioBuffer; 1026 uint32_t frames; 1027 size_t writtenSize; 1028 1029 mLock.lock(); 1030 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1031 // while we are accessing the cblk 1032 sp <IAudioTrack> audioTrack = mAudioTrack; 1033 sp <IMemory> iMem = mCblkMemory; 1034 audio_track_cblk_t* cblk = mCblk; 1035 mLock.unlock(); 1036 1037 // Manage underrun callback 1038 if (mActive && (cblk->framesAvailable() == cblk->frameCount)) { 1039 LOGV("Underrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags); 1040 if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) { 1041 mCbf(EVENT_UNDERRUN, mUserData, 0); 1042 if (cblk->server == cblk->frameCount) { 1043 mCbf(EVENT_BUFFER_END, mUserData, 0); 1044 } 1045 if (mSharedBuffer != 0) return false; 1046 } 1047 } 1048 1049 // Manage loop end callback 1050 while (mLoopCount > cblk->loopCount) { 1051 int loopCount = -1; 1052 mLoopCount--; 1053 if (mLoopCount >= 0) loopCount = mLoopCount; 1054 1055 mCbf(EVENT_LOOP_END, mUserData, (void *)&loopCount); 1056 } 1057 1058 // Manage marker callback 1059 if (!mMarkerReached && (mMarkerPosition > 0)) { 1060 if (cblk->server >= mMarkerPosition) { 1061 mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition); 1062 mMarkerReached = true; 1063 } 1064 } 1065 1066 // Manage new position callback 1067 if (mUpdatePeriod > 0) { 1068 while (cblk->server >= mNewPosition) { 1069 mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition); 1070 mNewPosition += mUpdatePeriod; 1071 } 1072 } 1073 1074 // If Shared buffer is used, no data is requested from client. 1075 if (mSharedBuffer != 0) { 1076 frames = 0; 1077 } else { 1078 frames = mRemainingFrames; 1079 } 1080 1081 do { 1082 1083 audioBuffer.frameCount = frames; 1084 1085 // Calling obtainBuffer() with a wait count of 1 1086 // limits wait time to WAIT_PERIOD_MS. This prevents from being 1087 // stuck here not being able to handle timed events (position, markers, loops). 1088 status_t err = obtainBuffer(&audioBuffer, 1); 1089 if (err < NO_ERROR) { 1090 if (err != TIMED_OUT) { 1091 LOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up."); 1092 return false; 1093 } 1094 break; 1095 } 1096 if (err == status_t(STOPPED)) return false; 1097 1098 // Divide buffer size by 2 to take into account the expansion 1099 // due to 8 to 16 bit conversion: the callback must fill only half 1100 // of the destination buffer 1101 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1102 audioBuffer.size >>= 1; 1103 } 1104 1105 size_t reqSize = audioBuffer.size; 1106 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 1107 writtenSize = audioBuffer.size; 1108 1109 // Sanity check on returned size 1110 if (ssize_t(writtenSize) <= 0) { 1111 // The callback is done filling buffers 1112 // Keep this thread going to handle timed events and 1113 // still try to get more data in intervals of WAIT_PERIOD_MS 1114 // but don't just loop and block the CPU, so wait 1115 usleep(WAIT_PERIOD_MS*1000); 1116 break; 1117 } 1118 if (writtenSize > reqSize) writtenSize = reqSize; 1119 1120 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1121 // 8 to 16 bit conversion 1122 const int8_t *src = audioBuffer.i8 + writtenSize-1; 1123 int count = writtenSize; 1124 int16_t *dst = audioBuffer.i16 + writtenSize-1; 1125 while(count--) { 1126 *dst-- = (int16_t)(*src--^0x80) << 8; 1127 } 1128 writtenSize <<= 1; 1129 } 1130 1131 audioBuffer.size = writtenSize; 1132 // NOTE: mCblk->frameSize is not equal to AudioTrack::frameSize() for 1133 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sampel size of 1134 // 16 bit. 1135 audioBuffer.frameCount = writtenSize/mCblk->frameSize; 1136 1137 frames -= audioBuffer.frameCount; 1138 1139 releaseBuffer(&audioBuffer); 1140 } 1141 while (frames); 1142 1143 if (frames == 0) { 1144 mRemainingFrames = mNotificationFramesAct; 1145 } else { 1146 mRemainingFrames = frames; 1147 } 1148 return true; 1149} 1150 1151// must be called with mLock and cblk.lock held. Callers must also hold strong references on 1152// the IAudioTrack and IMemory in case they are recreated here. 1153// If the IAudioTrack is successfully restored, the cblk pointer is updated 1154status_t AudioTrack::restoreTrack_l(audio_track_cblk_t*& cblk, bool fromStart) 1155{ 1156 status_t result; 1157 1158 if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) { 1159 LOGW("dead IAudioTrack, creating a new one from %s", 1160 fromStart ? "start()" : "obtainBuffer()"); 1161 1162 // signal old cblk condition so that other threads waiting for available buffers stop 1163 // waiting now 1164 cblk->cv.broadcast(); 1165 cblk->lock.unlock(); 1166 1167 // if the new IAudioTrack is created, createTrack_l() will modify the 1168 // following member variables: mAudioTrack, mCblkMemory and mCblk. 1169 // It will also delete the strong references on previous IAudioTrack and IMemory 1170 result = createTrack_l(mStreamType, 1171 cblk->sampleRate, 1172 mFormat, 1173 mChannelMask, 1174 mFrameCount, 1175 mFlags, 1176 mSharedBuffer, 1177 getOutput_l(), 1178 false); 1179 1180 if (result == NO_ERROR) { 1181 // restore write index and set other indexes to reflect empty buffer status 1182 mCblk->user = cblk->user; 1183 mCblk->server = cblk->user; 1184 mCblk->userBase = cblk->user; 1185 mCblk->serverBase = cblk->user; 1186 // restore loop: this is not guaranteed to succeed if new frame count is not 1187 // compatible with loop length 1188 setLoop_l(cblk->loopStart, cblk->loopEnd, cblk->loopCount); 1189 if (!fromStart) { 1190 mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1191 } 1192 if (mActive) { 1193 result = mAudioTrack->start(); 1194 } 1195 if (fromStart && result == NO_ERROR) { 1196 mNewPosition = mCblk->server + mUpdatePeriod; 1197 } 1198 } 1199 if (result != NO_ERROR) { 1200 mActive = false; 1201 } 1202 1203 // signal old cblk condition for other threads waiting for restore completion 1204 android_atomic_or(CBLK_RESTORED_ON, &cblk->flags); 1205 cblk->cv.broadcast(); 1206 } else { 1207 if (!(cblk->flags & CBLK_RESTORED_MSK)) { 1208 LOGW("dead IAudioTrack, waiting for a new one"); 1209 mLock.unlock(); 1210 result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS)); 1211 cblk->lock.unlock(); 1212 mLock.lock(); 1213 } else { 1214 LOGW("dead IAudioTrack, already restored"); 1215 result = NO_ERROR; 1216 cblk->lock.unlock(); 1217 } 1218 if (result != NO_ERROR || mActive == 0) { 1219 result = status_t(STOPPED); 1220 } 1221 } 1222 LOGV("restoreTrack_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x", 1223 result, mActive, mCblk, cblk, mCblk->flags, cblk->flags); 1224 1225 if (result == NO_ERROR) { 1226 // from now on we switch to the newly created cblk 1227 cblk = mCblk; 1228 } 1229 cblk->lock.lock(); 1230 1231 LOGW_IF(result != NO_ERROR, "restoreTrack_l() error %d", result); 1232 1233 return result; 1234} 1235 1236status_t AudioTrack::dump(int fd, const Vector<String16>& args) const 1237{ 1238 1239 const size_t SIZE = 256; 1240 char buffer[SIZE]; 1241 String8 result; 1242 1243 result.append(" AudioTrack::dump\n"); 1244 snprintf(buffer, 255, " stream type(%d), left - right volume(%f, %f)\n", mStreamType, mVolume[0], mVolume[1]); 1245 result.append(buffer); 1246 snprintf(buffer, 255, " format(%d), channel count(%d), frame count(%d)\n", mFormat, mChannelCount, mCblk->frameCount); 1247 result.append(buffer); 1248 snprintf(buffer, 255, " sample rate(%d), status(%d), muted(%d)\n", (mCblk == 0) ? 0 : mCblk->sampleRate, mStatus, mMuted); 1249 result.append(buffer); 1250 snprintf(buffer, 255, " active(%d), latency (%d)\n", mActive, mLatency); 1251 result.append(buffer); 1252 ::write(fd, result.string(), result.size()); 1253 return NO_ERROR; 1254} 1255 1256// ========================================================================= 1257 1258AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava) 1259 : Thread(bCanCallJava), mReceiver(receiver) 1260{ 1261} 1262 1263bool AudioTrack::AudioTrackThread::threadLoop() 1264{ 1265 return mReceiver.processAudioBuffer(this); 1266} 1267 1268status_t AudioTrack::AudioTrackThread::readyToRun() 1269{ 1270 return NO_ERROR; 1271} 1272 1273void AudioTrack::AudioTrackThread::onFirstRef() 1274{ 1275} 1276 1277// ========================================================================= 1278 1279 1280audio_track_cblk_t::audio_track_cblk_t() 1281 : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0), 1282 userBase(0), serverBase(0), buffers(0), frameCount(0), 1283 loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), volumeLR(0), 1284 sendLevel(0), flags(0) 1285{ 1286} 1287 1288uint32_t audio_track_cblk_t::stepUser(uint32_t frameCount) 1289{ 1290 uint32_t u = this->user; 1291 1292 u += frameCount; 1293 // Ensure that user is never ahead of server for AudioRecord 1294 if (flags & CBLK_DIRECTION_MSK) { 1295 // If stepServer() has been called once, switch to normal obtainBuffer() timeout period 1296 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) { 1297 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1298 } 1299 } else if (u > this->server) { 1300 LOGW("stepServer occured after track reset"); 1301 u = this->server; 1302 } 1303 1304 if (u >= userBase + this->frameCount) { 1305 userBase += this->frameCount; 1306 } 1307 1308 this->user = u; 1309 1310 // Clear flow control error condition as new data has been written/read to/from buffer. 1311 if (flags & CBLK_UNDERRUN_MSK) { 1312 android_atomic_and(~CBLK_UNDERRUN_MSK, &flags); 1313 } 1314 1315 return u; 1316} 1317 1318bool audio_track_cblk_t::stepServer(uint32_t frameCount) 1319{ 1320 if (!tryLock()) { 1321 LOGW("stepServer() could not lock cblk"); 1322 return false; 1323 } 1324 1325 uint32_t s = this->server; 1326 1327 s += frameCount; 1328 if (flags & CBLK_DIRECTION_MSK) { 1329 // Mark that we have read the first buffer so that next time stepUser() is called 1330 // we switch to normal obtainBuffer() timeout period 1331 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) { 1332 bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1; 1333 } 1334 // It is possible that we receive a flush() 1335 // while the mixer is processing a block: in this case, 1336 // stepServer() is called After the flush() has reset u & s and 1337 // we have s > u 1338 if (s > this->user) { 1339 LOGW("stepServer occured after track reset"); 1340 s = this->user; 1341 } 1342 } 1343 1344 if (s >= loopEnd) { 1345 LOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd); 1346 s = loopStart; 1347 if (--loopCount == 0) { 1348 loopEnd = UINT_MAX; 1349 loopStart = UINT_MAX; 1350 } 1351 } 1352 if (s >= serverBase + this->frameCount) { 1353 serverBase += this->frameCount; 1354 } 1355 1356 this->server = s; 1357 1358 if (!(flags & CBLK_INVALID_MSK)) { 1359 cv.signal(); 1360 } 1361 lock.unlock(); 1362 return true; 1363} 1364 1365void* audio_track_cblk_t::buffer(uint32_t offset) const 1366{ 1367 return (int8_t *)this->buffers + (offset - userBase) * this->frameSize; 1368} 1369 1370uint32_t audio_track_cblk_t::framesAvailable() 1371{ 1372 Mutex::Autolock _l(lock); 1373 return framesAvailable_l(); 1374} 1375 1376uint32_t audio_track_cblk_t::framesAvailable_l() 1377{ 1378 uint32_t u = this->user; 1379 uint32_t s = this->server; 1380 1381 if (flags & CBLK_DIRECTION_MSK) { 1382 uint32_t limit = (s < loopStart) ? s : loopStart; 1383 return limit + frameCount - u; 1384 } else { 1385 return frameCount + u - s; 1386 } 1387} 1388 1389uint32_t audio_track_cblk_t::framesReady() 1390{ 1391 uint32_t u = this->user; 1392 uint32_t s = this->server; 1393 1394 if (flags & CBLK_DIRECTION_MSK) { 1395 if (u < loopEnd) { 1396 return u - s; 1397 } else { 1398 // do not block on mutex shared with client on AudioFlinger side 1399 if (!tryLock()) { 1400 LOGW("framesReady() could not lock cblk"); 1401 return 0; 1402 } 1403 uint32_t frames = UINT_MAX; 1404 if (loopCount >= 0) { 1405 frames = (loopEnd - loopStart)*loopCount + u - s; 1406 } 1407 lock.unlock(); 1408 return frames; 1409 } 1410 } else { 1411 return s - u; 1412 } 1413} 1414 1415bool audio_track_cblk_t::tryLock() 1416{ 1417 // the code below simulates lock-with-timeout 1418 // we MUST do this to protect the AudioFlinger server 1419 // as this lock is shared with the client. 1420 status_t err; 1421 1422 err = lock.tryLock(); 1423 if (err == -EBUSY) { // just wait a bit 1424 usleep(1000); 1425 err = lock.tryLock(); 1426 } 1427 if (err != NO_ERROR) { 1428 // probably, the client just died. 1429 return false; 1430 } 1431 return true; 1432} 1433 1434// ------------------------------------------------------------------------- 1435 1436}; // namespace android 1437 1438