AudioTrack.cpp revision e53b9ead781c36e96d6b6f012ddffc93a3d80f0d
1/* 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#include <cutils/compiler.h> 42 43#include <system/audio.h> 44#include <system/audio_policy.h> 45 46#include <audio_utils/primitives.h> 47 48namespace android { 49// --------------------------------------------------------------------------- 50 51// static 52status_t AudioTrack::getMinFrameCount( 53 int* frameCount, 54 audio_stream_type_t 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 mIsTimed(false), 84 mPreviousPriority(ANDROID_PRIORITY_NORMAL), 85 mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT) 86{ 87} 88 89AudioTrack::AudioTrack( 90 audio_stream_type_t streamType, 91 uint32_t sampleRate, 92 audio_format_t format, 93 int channelMask, 94 int frameCount, 95 audio_policy_output_flags_t flags, 96 callback_t cbf, 97 void* user, 98 int notificationFrames, 99 int sessionId) 100 : mStatus(NO_INIT), 101 mIsTimed(false), 102 mPreviousPriority(ANDROID_PRIORITY_NORMAL), 103 mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT) 104{ 105 mStatus = set(streamType, sampleRate, format, channelMask, 106 frameCount, flags, cbf, user, notificationFrames, 107 0, false, sessionId); 108} 109 110AudioTrack::AudioTrack( 111 int streamType, 112 uint32_t sampleRate, 113 int format, 114 int channelMask, 115 int frameCount, 116 uint32_t flags, 117 callback_t cbf, 118 void* user, 119 int notificationFrames, 120 int sessionId) 121 : mStatus(NO_INIT), 122 mIsTimed(false), 123 mPreviousPriority(ANDROID_PRIORITY_NORMAL), mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT) 124{ 125 mStatus = set((audio_stream_type_t)streamType, sampleRate, (audio_format_t)format, channelMask, 126 frameCount, (audio_policy_output_flags_t)flags, cbf, user, notificationFrames, 127 0, false, sessionId); 128} 129 130AudioTrack::AudioTrack( 131 audio_stream_type_t streamType, 132 uint32_t sampleRate, 133 audio_format_t format, 134 int channelMask, 135 const sp<IMemory>& sharedBuffer, 136 audio_policy_output_flags_t flags, 137 callback_t cbf, 138 void* user, 139 int notificationFrames, 140 int sessionId) 141 : mStatus(NO_INIT), 142 mIsTimed(false), 143 mPreviousPriority(ANDROID_PRIORITY_NORMAL), 144 mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT) 145{ 146 mStatus = set(streamType, sampleRate, format, channelMask, 147 0, flags, cbf, user, notificationFrames, 148 sharedBuffer, false, sessionId); 149} 150 151AudioTrack::~AudioTrack() 152{ 153 ALOGV_IF(mSharedBuffer != 0, "Destructor sharedBuffer: %p", mSharedBuffer->pointer()); 154 155 if (mStatus == NO_ERROR) { 156 // Make sure that callback function exits in the case where 157 // it is looping on buffer full condition in obtainBuffer(). 158 // Otherwise the callback thread will never exit. 159 stop(); 160 if (mAudioTrackThread != 0) { 161 mAudioTrackThread->requestExitAndWait(); 162 mAudioTrackThread.clear(); 163 } 164 mAudioTrack.clear(); 165 IPCThreadState::self()->flushCommands(); 166 AudioSystem::releaseAudioSessionId(mSessionId); 167 } 168} 169 170status_t AudioTrack::set( 171 audio_stream_type_t streamType, 172 uint32_t sampleRate, 173 audio_format_t format, 174 int channelMask, 175 int frameCount, 176 audio_policy_output_flags_t flags, 177 callback_t cbf, 178 void* user, 179 int notificationFrames, 180 const sp<IMemory>& sharedBuffer, 181 bool threadCanCallJava, 182 int sessionId) 183{ 184 185 ALOGV_IF(sharedBuffer != 0, "sharedBuffer: %p, size: %d", sharedBuffer->pointer(), sharedBuffer->size()); 186 187 AutoMutex lock(mLock); 188 if (mAudioTrack != 0) { 189 ALOGE("Track already in use"); 190 return INVALID_OPERATION; 191 } 192 193 int afSampleRate; 194 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 195 return NO_INIT; 196 } 197 uint32_t afLatency; 198 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 199 return NO_INIT; 200 } 201 202 // handle default values first. 203 if (streamType == AUDIO_STREAM_DEFAULT) { 204 streamType = AUDIO_STREAM_MUSIC; 205 } 206 if (sampleRate == 0) { 207 sampleRate = afSampleRate; 208 } 209 // these below should probably come from the audioFlinger too... 210 if (format == AUDIO_FORMAT_DEFAULT) { 211 format = AUDIO_FORMAT_PCM_16_BIT; 212 } 213 if (channelMask == 0) { 214 channelMask = AUDIO_CHANNEL_OUT_STEREO; 215 } 216 217 // validate parameters 218 if (!audio_is_valid_format(format)) { 219 ALOGE("Invalid format"); 220 return BAD_VALUE; 221 } 222 223 // force direct flag if format is not linear PCM 224 if (!audio_is_linear_pcm(format)) { 225 flags = (audio_policy_output_flags_t) (flags | AUDIO_POLICY_OUTPUT_FLAG_DIRECT); 226 } 227 228 if (!audio_is_output_channel(channelMask)) { 229 ALOGE("Invalid channel mask"); 230 return BAD_VALUE; 231 } 232 uint32_t channelCount = popcount(channelMask); 233 234 audio_io_handle_t output = AudioSystem::getOutput( 235 streamType, 236 sampleRate, format, channelMask, 237 flags); 238 239 if (output == 0) { 240 ALOGE("Could not get audio output for stream type %d", streamType); 241 return BAD_VALUE; 242 } 243 244 mVolume[LEFT] = 1.0f; 245 mVolume[RIGHT] = 1.0f; 246 mSendLevel = 0.0f; 247 mFrameCount = frameCount; 248 mNotificationFramesReq = notificationFrames; 249 mSessionId = sessionId; 250 mAuxEffectId = 0; 251 252 // create the IAudioTrack 253 status_t status = createTrack_l(streamType, 254 sampleRate, 255 format, 256 (uint32_t)channelMask, 257 frameCount, 258 flags, 259 sharedBuffer, 260 output, 261 true); 262 263 if (status != NO_ERROR) { 264 return status; 265 } 266 267 if (cbf != NULL) { 268 mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava); 269 } 270 271 mStatus = NO_ERROR; 272 273 mStreamType = streamType; 274 mFormat = format; 275 mChannelMask = (uint32_t)channelMask; 276 mChannelCount = channelCount; 277 mSharedBuffer = sharedBuffer; 278 mMuted = false; 279 mActive = false; 280 mCbf = cbf; 281 mUserData = user; 282 mLoopCount = 0; 283 mMarkerPosition = 0; 284 mMarkerReached = false; 285 mNewPosition = 0; 286 mUpdatePeriod = 0; 287 mFlushed = false; 288 mFlags = flags; 289 AudioSystem::acquireAudioSessionId(mSessionId); 290 mRestoreStatus = NO_ERROR; 291 return NO_ERROR; 292} 293 294status_t AudioTrack::initCheck() const 295{ 296 return mStatus; 297} 298 299// ------------------------------------------------------------------------- 300 301uint32_t AudioTrack::latency() const 302{ 303 return mLatency; 304} 305 306audio_stream_type_t AudioTrack::streamType() const 307{ 308 return mStreamType; 309} 310 311audio_format_t AudioTrack::format() const 312{ 313 return mFormat; 314} 315 316int AudioTrack::channelCount() const 317{ 318 return mChannelCount; 319} 320 321uint32_t AudioTrack::frameCount() const 322{ 323 return mCblk->frameCount; 324} 325 326size_t AudioTrack::frameSize() const 327{ 328 if (audio_is_linear_pcm(mFormat)) { 329 return channelCount()*audio_bytes_per_sample(mFormat); 330 } else { 331 return sizeof(uint8_t); 332 } 333} 334 335sp<IMemory>& AudioTrack::sharedBuffer() 336{ 337 return mSharedBuffer; 338} 339 340// ------------------------------------------------------------------------- 341 342void AudioTrack::start() 343{ 344 sp<AudioTrackThread> t = mAudioTrackThread; 345 status_t status = NO_ERROR; 346 347 ALOGV("start %p", this); 348 if (t != 0) { 349 if (t->exitPending()) { 350 if (t->requestExitAndWait() == WOULD_BLOCK) { 351 ALOGE("AudioTrack::start called from thread"); 352 return; 353 } 354 } 355 } 356 357 AutoMutex lock(mLock); 358 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 359 // while we are accessing the cblk 360 sp<IAudioTrack> audioTrack = mAudioTrack; 361 sp<IMemory> iMem = mCblkMemory; 362 audio_track_cblk_t* cblk = mCblk; 363 364 if (!mActive) { 365 mFlushed = false; 366 mActive = true; 367 mNewPosition = cblk->server + mUpdatePeriod; 368 cblk->lock.lock(); 369 cblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 370 cblk->waitTimeMs = 0; 371 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 372 pid_t tid; 373 if (t != 0) { 374 t->run("AudioTrack", ANDROID_PRIORITY_AUDIO); 375 tid = t->getTid(); // pid_t is unknown until run() 376 ALOGV("getTid=%d", tid); 377 if (tid == -1) { 378 tid = 0; 379 } 380 } else { 381 mPreviousPriority = getpriority(PRIO_PROCESS, 0); 382 mPreviousSchedulingGroup = androidGetThreadSchedulingGroup(0); 383 androidSetThreadPriority(0, ANDROID_PRIORITY_AUDIO); 384 tid = 0; // not gettid() 385 } 386 387 ALOGV("start %p before lock cblk %p", this, mCblk); 388 if (!(cblk->flags & CBLK_INVALID_MSK)) { 389 cblk->lock.unlock(); 390 ALOGV("mAudioTrack->start(tid=%d)", tid); 391 status = mAudioTrack->start(tid); 392 cblk->lock.lock(); 393 if (status == DEAD_OBJECT) { 394 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 395 } 396 } 397 if (cblk->flags & CBLK_INVALID_MSK) { 398 status = restoreTrack_l(cblk, true); 399 } 400 cblk->lock.unlock(); 401 if (status != NO_ERROR) { 402 ALOGV("start() failed"); 403 mActive = false; 404 if (t != 0) { 405 t->requestExit(); 406 } else { 407 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 408 androidSetThreadSchedulingGroup(0, mPreviousSchedulingGroup); 409 } 410 } 411 } 412 413} 414 415void AudioTrack::stop() 416{ 417 sp<AudioTrackThread> t = mAudioTrackThread; 418 419 ALOGV("stop %p", this); 420 421 AutoMutex lock(mLock); 422 if (mActive) { 423 mActive = false; 424 mCblk->cv.signal(); 425 mAudioTrack->stop(); 426 // Cancel loops (If we are in the middle of a loop, playback 427 // would not stop until loopCount reaches 0). 428 setLoop_l(0, 0, 0); 429 // the playback head position will reset to 0, so if a marker is set, we need 430 // to activate it again 431 mMarkerReached = false; 432 // Force flush if a shared buffer is used otherwise audioflinger 433 // will not stop before end of buffer is reached. 434 if (mSharedBuffer != 0) { 435 flush_l(); 436 } 437 if (t != 0) { 438 t->requestExit(); 439 } else { 440 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 441 androidSetThreadSchedulingGroup(0, mPreviousSchedulingGroup); 442 } 443 } 444 445} 446 447bool AudioTrack::stopped() const 448{ 449 AutoMutex lock(mLock); 450 return stopped_l(); 451} 452 453void AudioTrack::flush() 454{ 455 AutoMutex lock(mLock); 456 flush_l(); 457} 458 459// must be called with mLock held 460void AudioTrack::flush_l() 461{ 462 ALOGV("flush"); 463 464 // clear playback marker and periodic update counter 465 mMarkerPosition = 0; 466 mMarkerReached = false; 467 mUpdatePeriod = 0; 468 469 if (!mActive) { 470 mFlushed = true; 471 mAudioTrack->flush(); 472 // Release AudioTrack callback thread in case it was waiting for new buffers 473 // in AudioTrack::obtainBuffer() 474 mCblk->cv.signal(); 475 } 476} 477 478void AudioTrack::pause() 479{ 480 ALOGV("pause"); 481 AutoMutex lock(mLock); 482 if (mActive) { 483 mActive = false; 484 mAudioTrack->pause(); 485 } 486} 487 488void AudioTrack::mute(bool e) 489{ 490 mAudioTrack->mute(e); 491 mMuted = e; 492} 493 494bool AudioTrack::muted() const 495{ 496 return mMuted; 497} 498 499status_t AudioTrack::setVolume(float left, float right) 500{ 501 if (left < 0.0f || left > 1.0f || right < 0.0f || right > 1.0f) { 502 return BAD_VALUE; 503 } 504 505 AutoMutex lock(mLock); 506 mVolume[LEFT] = left; 507 mVolume[RIGHT] = right; 508 509 mCblk->setVolumeLR((uint32_t(uint16_t(right * 0x1000)) << 16) | uint16_t(left * 0x1000)); 510 511 return NO_ERROR; 512} 513 514void AudioTrack::getVolume(float* left, float* right) const 515{ 516 if (left != NULL) { 517 *left = mVolume[LEFT]; 518 } 519 if (right != NULL) { 520 *right = mVolume[RIGHT]; 521 } 522} 523 524status_t AudioTrack::setAuxEffectSendLevel(float level) 525{ 526 ALOGV("setAuxEffectSendLevel(%f)", level); 527 if (level < 0.0f || level > 1.0f) { 528 return BAD_VALUE; 529 } 530 AutoMutex lock(mLock); 531 532 mSendLevel = level; 533 534 mCblk->setSendLevel(level); 535 536 return NO_ERROR; 537} 538 539void AudioTrack::getAuxEffectSendLevel(float* level) const 540{ 541 if (level != NULL) { 542 *level = mSendLevel; 543 } 544} 545 546status_t AudioTrack::setSampleRate(int rate) 547{ 548 int afSamplingRate; 549 550 if (mIsTimed) { 551 return INVALID_OPERATION; 552 } 553 554 if (AudioSystem::getOutputSamplingRate(&afSamplingRate, mStreamType) != NO_ERROR) { 555 return NO_INIT; 556 } 557 // Resampler implementation limits input sampling rate to 2 x output sampling rate. 558 if (rate <= 0 || rate > afSamplingRate*2 ) return BAD_VALUE; 559 560 AutoMutex lock(mLock); 561 mCblk->sampleRate = rate; 562 return NO_ERROR; 563} 564 565uint32_t AudioTrack::getSampleRate() const 566{ 567 if (mIsTimed) { 568 return INVALID_OPERATION; 569 } 570 571 AutoMutex lock(mLock); 572 return mCblk->sampleRate; 573} 574 575status_t AudioTrack::setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount) 576{ 577 AutoMutex lock(mLock); 578 return setLoop_l(loopStart, loopEnd, loopCount); 579} 580 581// must be called with mLock held 582status_t AudioTrack::setLoop_l(uint32_t loopStart, uint32_t loopEnd, int loopCount) 583{ 584 audio_track_cblk_t* cblk = mCblk; 585 586 Mutex::Autolock _l(cblk->lock); 587 588 if (loopCount == 0) { 589 cblk->loopStart = UINT_MAX; 590 cblk->loopEnd = UINT_MAX; 591 cblk->loopCount = 0; 592 mLoopCount = 0; 593 return NO_ERROR; 594 } 595 596 if (mIsTimed) { 597 return INVALID_OPERATION; 598 } 599 600 if (loopStart >= loopEnd || 601 loopEnd - loopStart > cblk->frameCount || 602 cblk->server > loopStart) { 603 ALOGE("setLoop invalid value: loopStart %d, loopEnd %d, loopCount %d, framecount %d, user %d", loopStart, loopEnd, loopCount, cblk->frameCount, cblk->user); 604 return BAD_VALUE; 605 } 606 607 if ((mSharedBuffer != 0) && (loopEnd > cblk->frameCount)) { 608 ALOGE("setLoop invalid value: loop markers beyond data: loopStart %d, loopEnd %d, framecount %d", 609 loopStart, loopEnd, cblk->frameCount); 610 return BAD_VALUE; 611 } 612 613 cblk->loopStart = loopStart; 614 cblk->loopEnd = loopEnd; 615 cblk->loopCount = loopCount; 616 mLoopCount = loopCount; 617 618 return NO_ERROR; 619} 620 621status_t AudioTrack::setMarkerPosition(uint32_t marker) 622{ 623 if (mCbf == NULL) return INVALID_OPERATION; 624 625 mMarkerPosition = marker; 626 mMarkerReached = false; 627 628 return NO_ERROR; 629} 630 631status_t AudioTrack::getMarkerPosition(uint32_t *marker) const 632{ 633 if (marker == NULL) return BAD_VALUE; 634 635 *marker = mMarkerPosition; 636 637 return NO_ERROR; 638} 639 640status_t AudioTrack::setPositionUpdatePeriod(uint32_t updatePeriod) 641{ 642 if (mCbf == NULL) return INVALID_OPERATION; 643 644 uint32_t curPosition; 645 getPosition(&curPosition); 646 mNewPosition = curPosition + updatePeriod; 647 mUpdatePeriod = updatePeriod; 648 649 return NO_ERROR; 650} 651 652status_t AudioTrack::getPositionUpdatePeriod(uint32_t *updatePeriod) const 653{ 654 if (updatePeriod == NULL) return BAD_VALUE; 655 656 *updatePeriod = mUpdatePeriod; 657 658 return NO_ERROR; 659} 660 661status_t AudioTrack::setPosition(uint32_t position) 662{ 663 if (mIsTimed) return INVALID_OPERATION; 664 665 AutoMutex lock(mLock); 666 667 if (!stopped_l()) return INVALID_OPERATION; 668 669 Mutex::Autolock _l(mCblk->lock); 670 671 if (position > mCblk->user) return BAD_VALUE; 672 673 mCblk->server = position; 674 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 675 676 return NO_ERROR; 677} 678 679status_t AudioTrack::getPosition(uint32_t *position) 680{ 681 if (position == NULL) return BAD_VALUE; 682 AutoMutex lock(mLock); 683 *position = mFlushed ? 0 : mCblk->server; 684 685 return NO_ERROR; 686} 687 688status_t AudioTrack::reload() 689{ 690 AutoMutex lock(mLock); 691 692 if (!stopped_l()) return INVALID_OPERATION; 693 694 flush_l(); 695 696 mCblk->stepUser(mCblk->frameCount); 697 698 return NO_ERROR; 699} 700 701audio_io_handle_t AudioTrack::getOutput() 702{ 703 AutoMutex lock(mLock); 704 return getOutput_l(); 705} 706 707// must be called with mLock held 708audio_io_handle_t AudioTrack::getOutput_l() 709{ 710 return AudioSystem::getOutput(mStreamType, 711 mCblk->sampleRate, mFormat, mChannelMask, mFlags); 712} 713 714int AudioTrack::getSessionId() const 715{ 716 return mSessionId; 717} 718 719status_t AudioTrack::attachAuxEffect(int effectId) 720{ 721 ALOGV("attachAuxEffect(%d)", effectId); 722 status_t status = mAudioTrack->attachAuxEffect(effectId); 723 if (status == NO_ERROR) { 724 mAuxEffectId = effectId; 725 } 726 return status; 727} 728 729// ------------------------------------------------------------------------- 730 731// must be called with mLock held 732status_t AudioTrack::createTrack_l( 733 audio_stream_type_t streamType, 734 uint32_t sampleRate, 735 audio_format_t format, 736 uint32_t channelMask, 737 int frameCount, 738 audio_policy_output_flags_t flags, 739 const sp<IMemory>& sharedBuffer, 740 audio_io_handle_t output, 741 bool enforceFrameCount) 742{ 743 status_t status; 744 const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger(); 745 if (audioFlinger == 0) { 746 ALOGE("Could not get audioflinger"); 747 return NO_INIT; 748 } 749 750 int afSampleRate; 751 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 752 return NO_INIT; 753 } 754 int afFrameCount; 755 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 756 return NO_INIT; 757 } 758 uint32_t afLatency; 759 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 760 return NO_INIT; 761 } 762 763 mNotificationFramesAct = mNotificationFramesReq; 764 if (!audio_is_linear_pcm(format)) { 765 if (sharedBuffer != 0) { 766 frameCount = sharedBuffer->size(); 767 } 768 } else { 769 // Ensure that buffer depth covers at least audio hardware latency 770 uint32_t minBufCount = afLatency / ((1000 * afFrameCount)/afSampleRate); 771 if (minBufCount < 2) minBufCount = 2; 772 773 int minFrameCount = (afFrameCount*sampleRate*minBufCount)/afSampleRate; 774 775 if (sharedBuffer == 0) { 776 if (frameCount == 0) { 777 frameCount = minFrameCount; 778 } 779 if (mNotificationFramesAct == 0) { 780 mNotificationFramesAct = frameCount/2; 781 } 782 // Make sure that application is notified with sufficient margin 783 // before underrun 784 if (mNotificationFramesAct > (uint32_t)frameCount/2) { 785 mNotificationFramesAct = frameCount/2; 786 } 787 if (frameCount < minFrameCount) { 788 ALOGW_IF(enforceFrameCount, "Minimum buffer size corrected from %d to %d", 789 frameCount, minFrameCount); 790 frameCount = minFrameCount; 791 } 792 } else { 793 // Ensure that buffer alignment matches channelCount 794 int channelCount = popcount(channelMask); 795 if (((uint32_t)sharedBuffer->pointer() & (channelCount | 1)) != 0) { 796 ALOGE("Invalid buffer alignement: address %p, channelCount %d", sharedBuffer->pointer(), channelCount); 797 return BAD_VALUE; 798 } 799 frameCount = sharedBuffer->size()/channelCount/sizeof(int16_t); 800 } 801 } 802 803 sp<IAudioTrack> track = audioFlinger->createTrack(getpid(), 804 streamType, 805 sampleRate, 806 format, 807 channelMask, 808 frameCount, 809 ((uint16_t)flags) << 16, 810 sharedBuffer, 811 output, 812 mIsTimed, 813 &mSessionId, 814 &status); 815 816 if (track == 0) { 817 ALOGE("AudioFlinger could not create track, status: %d", status); 818 return status; 819 } 820 sp<IMemory> cblk = track->getCblk(); 821 if (cblk == 0) { 822 ALOGE("Could not get control block"); 823 return NO_INIT; 824 } 825 mAudioTrack = track; 826 mCblkMemory = cblk; 827 mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer()); 828 android_atomic_or(CBLK_DIRECTION_OUT, &mCblk->flags); 829 if (sharedBuffer == 0) { 830 mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t); 831 } else { 832 mCblk->buffers = sharedBuffer->pointer(); 833 // Force buffer full condition as data is already present in shared memory 834 mCblk->stepUser(mCblk->frameCount); 835 } 836 837 mCblk->setVolumeLR((uint32_t(uint16_t(mVolume[RIGHT] * 0x1000)) << 16) | uint16_t(mVolume[LEFT] * 0x1000)); 838 mCblk->setSendLevel(mSendLevel); 839 mAudioTrack->attachAuxEffect(mAuxEffectId); 840 mCblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 841 mCblk->waitTimeMs = 0; 842 mRemainingFrames = mNotificationFramesAct; 843 mLatency = afLatency + (1000*mCblk->frameCount) / sampleRate; 844 return NO_ERROR; 845} 846 847status_t AudioTrack::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 848{ 849 AutoMutex lock(mLock); 850 bool active; 851 status_t result = NO_ERROR; 852 audio_track_cblk_t* cblk = mCblk; 853 uint32_t framesReq = audioBuffer->frameCount; 854 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 855 856 audioBuffer->frameCount = 0; 857 audioBuffer->size = 0; 858 859 uint32_t framesAvail = cblk->framesAvailable(); 860 861 cblk->lock.lock(); 862 if (cblk->flags & CBLK_INVALID_MSK) { 863 goto create_new_track; 864 } 865 cblk->lock.unlock(); 866 867 if (framesAvail == 0) { 868 cblk->lock.lock(); 869 goto start_loop_here; 870 while (framesAvail == 0) { 871 active = mActive; 872 if (CC_UNLIKELY(!active)) { 873 ALOGV("Not active and NO_MORE_BUFFERS"); 874 cblk->lock.unlock(); 875 return NO_MORE_BUFFERS; 876 } 877 if (CC_UNLIKELY(!waitCount)) { 878 cblk->lock.unlock(); 879 return WOULD_BLOCK; 880 } 881 if (!(cblk->flags & CBLK_INVALID_MSK)) { 882 mLock.unlock(); 883 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 884 cblk->lock.unlock(); 885 mLock.lock(); 886 if (!mActive) { 887 return status_t(STOPPED); 888 } 889 cblk->lock.lock(); 890 } 891 892 if (cblk->flags & CBLK_INVALID_MSK) { 893 goto create_new_track; 894 } 895 if (CC_UNLIKELY(result != NO_ERROR)) { 896 cblk->waitTimeMs += waitTimeMs; 897 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 898 // timing out when a loop has been set and we have already written upto loop end 899 // is a normal condition: no need to wake AudioFlinger up. 900 if (cblk->user < cblk->loopEnd) { 901 ALOGW( "obtainBuffer timed out (is the CPU pegged?) %p " 902 "user=%08x, server=%08x", this, cblk->user, cblk->server); 903 //unlock cblk mutex before calling mAudioTrack->start() (see issue #1617140) 904 cblk->lock.unlock(); 905 result = mAudioTrack->start(0); // callback thread hasn't changed 906 cblk->lock.lock(); 907 if (result == DEAD_OBJECT) { 908 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 909create_new_track: 910 result = restoreTrack_l(cblk, false); 911 } 912 if (result != NO_ERROR) { 913 ALOGW("obtainBuffer create Track error %d", result); 914 cblk->lock.unlock(); 915 return result; 916 } 917 } 918 cblk->waitTimeMs = 0; 919 } 920 921 if (--waitCount == 0) { 922 cblk->lock.unlock(); 923 return TIMED_OUT; 924 } 925 } 926 // read the server count again 927 start_loop_here: 928 framesAvail = cblk->framesAvailable_l(); 929 } 930 cblk->lock.unlock(); 931 } 932 933 // restart track if it was disabled by audioflinger due to previous underrun 934 if (mActive && (cblk->flags & CBLK_DISABLED_MSK)) { 935 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 936 ALOGW("obtainBuffer() track %p disabled, restarting", this); 937 mAudioTrack->start(0); // callback thread hasn't changed 938 } 939 940 cblk->waitTimeMs = 0; 941 942 if (framesReq > framesAvail) { 943 framesReq = framesAvail; 944 } 945 946 uint32_t u = cblk->user; 947 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 948 949 if (u + framesReq > bufferEnd) { 950 framesReq = bufferEnd - u; 951 } 952 953 audioBuffer->flags = mMuted ? Buffer::MUTE : 0; 954 audioBuffer->channelCount = mChannelCount; 955 audioBuffer->frameCount = framesReq; 956 audioBuffer->size = framesReq * cblk->frameSize; 957 if (audio_is_linear_pcm(mFormat)) { 958 audioBuffer->format = AUDIO_FORMAT_PCM_16_BIT; 959 } else { 960 audioBuffer->format = mFormat; 961 } 962 audioBuffer->raw = (int8_t *)cblk->buffer(u); 963 active = mActive; 964 return active ? status_t(NO_ERROR) : status_t(STOPPED); 965} 966 967void AudioTrack::releaseBuffer(Buffer* audioBuffer) 968{ 969 AutoMutex lock(mLock); 970 mCblk->stepUser(audioBuffer->frameCount); 971} 972 973// ------------------------------------------------------------------------- 974 975ssize_t AudioTrack::write(const void* buffer, size_t userSize) 976{ 977 978 if (mSharedBuffer != 0) return INVALID_OPERATION; 979 if (mIsTimed) return INVALID_OPERATION; 980 981 if (ssize_t(userSize) < 0) { 982 // Sanity-check: user is most-likely passing an error code, and it would 983 // make the return value ambiguous (actualSize vs error). 984 ALOGE("AudioTrack::write(buffer=%p, size=%u (%d)", 985 buffer, userSize, userSize); 986 return BAD_VALUE; 987 } 988 989 ALOGV("write %p: %d bytes, mActive=%d", this, userSize, mActive); 990 991 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 992 // while we are accessing the cblk 993 mLock.lock(); 994 sp<IAudioTrack> audioTrack = mAudioTrack; 995 sp<IMemory> iMem = mCblkMemory; 996 mLock.unlock(); 997 998 ssize_t written = 0; 999 const int8_t *src = (const int8_t *)buffer; 1000 Buffer audioBuffer; 1001 size_t frameSz = frameSize(); 1002 1003 do { 1004 audioBuffer.frameCount = userSize/frameSz; 1005 1006 status_t err = obtainBuffer(&audioBuffer, -1); 1007 if (err < 0) { 1008 // out of buffers, return #bytes written 1009 if (err == status_t(NO_MORE_BUFFERS)) 1010 break; 1011 return ssize_t(err); 1012 } 1013 1014 size_t toWrite; 1015 1016 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1017 // Divide capacity by 2 to take expansion into account 1018 toWrite = audioBuffer.size>>1; 1019 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) src, toWrite); 1020 } else { 1021 toWrite = audioBuffer.size; 1022 memcpy(audioBuffer.i8, src, toWrite); 1023 src += toWrite; 1024 } 1025 userSize -= toWrite; 1026 written += toWrite; 1027 1028 releaseBuffer(&audioBuffer); 1029 } while (userSize >= frameSz); 1030 1031 return written; 1032} 1033 1034// ------------------------------------------------------------------------- 1035 1036TimedAudioTrack::TimedAudioTrack() { 1037 mIsTimed = true; 1038} 1039 1040status_t TimedAudioTrack::allocateTimedBuffer(size_t size, sp<IMemory>* buffer) 1041{ 1042 status_t result = UNKNOWN_ERROR; 1043 1044 // If the track is not invalid already, try to allocate a buffer. alloc 1045 // fails indicating that the server is dead, flag the track as invalid so 1046 // we can attempt to restore in in just a bit. 1047 if (!(mCblk->flags & CBLK_INVALID_MSK)) { 1048 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1049 if (result == DEAD_OBJECT) { 1050 android_atomic_or(CBLK_INVALID_ON, &mCblk->flags); 1051 } 1052 } 1053 1054 // If the track is invalid at this point, attempt to restore it. and try the 1055 // allocation one more time. 1056 if (mCblk->flags & CBLK_INVALID_MSK) { 1057 mCblk->lock.lock(); 1058 result = restoreTrack_l(mCblk, false); 1059 mCblk->lock.unlock(); 1060 1061 if (result == OK) 1062 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1063 } 1064 1065 return result; 1066} 1067 1068status_t TimedAudioTrack::queueTimedBuffer(const sp<IMemory>& buffer, 1069 int64_t pts) 1070{ 1071 // restart track if it was disabled by audioflinger due to previous underrun 1072 if (mActive && (mCblk->flags & CBLK_DISABLED_MSK)) { 1073 android_atomic_and(~CBLK_DISABLED_ON, &mCblk->flags); 1074 ALOGW("queueTimedBuffer() track %p disabled, restarting", this); 1075 mAudioTrack->start(0); 1076 } 1077 1078 return mAudioTrack->queueTimedBuffer(buffer, pts); 1079} 1080 1081status_t TimedAudioTrack::setMediaTimeTransform(const LinearTransform& xform, 1082 TargetTimeline target) 1083{ 1084 return mAudioTrack->setMediaTimeTransform(xform, target); 1085} 1086 1087// ------------------------------------------------------------------------- 1088 1089bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 1090{ 1091 Buffer audioBuffer; 1092 uint32_t frames; 1093 size_t writtenSize; 1094 1095 mLock.lock(); 1096 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1097 // while we are accessing the cblk 1098 sp<IAudioTrack> audioTrack = mAudioTrack; 1099 sp<IMemory> iMem = mCblkMemory; 1100 audio_track_cblk_t* cblk = mCblk; 1101 bool active = mActive; 1102 mLock.unlock(); 1103 1104 // Manage underrun callback 1105 if (active && (cblk->framesAvailable() == cblk->frameCount)) { 1106 ALOGV("Underrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags); 1107 if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) { 1108 mCbf(EVENT_UNDERRUN, mUserData, 0); 1109 if (cblk->server == cblk->frameCount) { 1110 mCbf(EVENT_BUFFER_END, mUserData, 0); 1111 } 1112 if (mSharedBuffer != 0) return false; 1113 } 1114 } 1115 1116 // Manage loop end callback 1117 while (mLoopCount > cblk->loopCount) { 1118 int loopCount = -1; 1119 mLoopCount--; 1120 if (mLoopCount >= 0) loopCount = mLoopCount; 1121 1122 mCbf(EVENT_LOOP_END, mUserData, (void *)&loopCount); 1123 } 1124 1125 // Manage marker callback 1126 if (!mMarkerReached && (mMarkerPosition > 0)) { 1127 if (cblk->server >= mMarkerPosition) { 1128 mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition); 1129 mMarkerReached = true; 1130 } 1131 } 1132 1133 // Manage new position callback 1134 if (mUpdatePeriod > 0) { 1135 while (cblk->server >= mNewPosition) { 1136 mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition); 1137 mNewPosition += mUpdatePeriod; 1138 } 1139 } 1140 1141 // If Shared buffer is used, no data is requested from client. 1142 if (mSharedBuffer != 0) { 1143 frames = 0; 1144 } else { 1145 frames = mRemainingFrames; 1146 } 1147 1148 // See description of waitCount parameter at declaration of obtainBuffer(). 1149 // The logic below prevents us from being stuck below at obtainBuffer() 1150 // not being able to handle timed events (position, markers, loops). 1151 int32_t waitCount = -1; 1152 if (mUpdatePeriod || (!mMarkerReached && mMarkerPosition) || mLoopCount) { 1153 waitCount = 1; 1154 } 1155 1156 do { 1157 1158 audioBuffer.frameCount = frames; 1159 1160 status_t err = obtainBuffer(&audioBuffer, waitCount); 1161 if (err < NO_ERROR) { 1162 if (err != TIMED_OUT) { 1163 ALOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up."); 1164 return false; 1165 } 1166 break; 1167 } 1168 if (err == status_t(STOPPED)) return false; 1169 1170 // Divide buffer size by 2 to take into account the expansion 1171 // due to 8 to 16 bit conversion: the callback must fill only half 1172 // of the destination buffer 1173 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1174 audioBuffer.size >>= 1; 1175 } 1176 1177 size_t reqSize = audioBuffer.size; 1178 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 1179 writtenSize = audioBuffer.size; 1180 1181 // Sanity check on returned size 1182 if (ssize_t(writtenSize) <= 0) { 1183 // The callback is done filling buffers 1184 // Keep this thread going to handle timed events and 1185 // still try to get more data in intervals of WAIT_PERIOD_MS 1186 // but don't just loop and block the CPU, so wait 1187 usleep(WAIT_PERIOD_MS*1000); 1188 break; 1189 } 1190 if (writtenSize > reqSize) writtenSize = reqSize; 1191 1192 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1193 // 8 to 16 bit conversion, note that source and destination are the same address 1194 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) audioBuffer.i8, writtenSize); 1195 writtenSize <<= 1; 1196 } 1197 1198 audioBuffer.size = writtenSize; 1199 // NOTE: mCblk->frameSize is not equal to AudioTrack::frameSize() for 1200 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of 1201 // 16 bit. 1202 audioBuffer.frameCount = writtenSize/mCblk->frameSize; 1203 1204 frames -= audioBuffer.frameCount; 1205 1206 releaseBuffer(&audioBuffer); 1207 } 1208 while (frames); 1209 1210 if (frames == 0) { 1211 mRemainingFrames = mNotificationFramesAct; 1212 } else { 1213 mRemainingFrames = frames; 1214 } 1215 return true; 1216} 1217 1218// must be called with mLock and cblk.lock held. Callers must also hold strong references on 1219// the IAudioTrack and IMemory in case they are recreated here. 1220// If the IAudioTrack is successfully restored, the cblk pointer is updated 1221status_t AudioTrack::restoreTrack_l(audio_track_cblk_t*& cblk, bool fromStart) 1222{ 1223 status_t result; 1224 1225 if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) { 1226 ALOGW("dead IAudioTrack, creating a new one from %s TID %d", 1227 fromStart ? "start()" : "obtainBuffer()", gettid()); 1228 1229 // signal old cblk condition so that other threads waiting for available buffers stop 1230 // waiting now 1231 cblk->cv.broadcast(); 1232 cblk->lock.unlock(); 1233 1234 // refresh the audio configuration cache in this process to make sure we get new 1235 // output parameters in getOutput_l() and createTrack_l() 1236 AudioSystem::clearAudioConfigCache(); 1237 1238 // if the new IAudioTrack is created, createTrack_l() will modify the 1239 // following member variables: mAudioTrack, mCblkMemory and mCblk. 1240 // It will also delete the strong references on previous IAudioTrack and IMemory 1241 result = createTrack_l(mStreamType, 1242 cblk->sampleRate, 1243 mFormat, 1244 mChannelMask, 1245 mFrameCount, 1246 mFlags, 1247 mSharedBuffer, 1248 getOutput_l(), 1249 false); 1250 1251 if (result == NO_ERROR) { 1252 uint32_t user = cblk->user; 1253 uint32_t server = cblk->server; 1254 // restore write index and set other indexes to reflect empty buffer status 1255 mCblk->user = user; 1256 mCblk->server = user; 1257 mCblk->userBase = user; 1258 mCblk->serverBase = user; 1259 // restore loop: this is not guaranteed to succeed if new frame count is not 1260 // compatible with loop length 1261 setLoop_l(cblk->loopStart, cblk->loopEnd, cblk->loopCount); 1262 if (!fromStart) { 1263 mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1264 // Make sure that a client relying on callback events indicating underrun or 1265 // the actual amount of audio frames played (e.g SoundPool) receives them. 1266 if (mSharedBuffer == 0) { 1267 uint32_t frames = 0; 1268 if (user > server) { 1269 frames = ((user - server) > mCblk->frameCount) ? 1270 mCblk->frameCount : (user - server); 1271 memset(mCblk->buffers, 0, frames * mCblk->frameSize); 1272 } 1273 // restart playback even if buffer is not completely filled. 1274 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 1275 // stepUser() clears CBLK_UNDERRUN_ON flag enabling underrun callbacks to 1276 // the client 1277 mCblk->stepUser(frames); 1278 } 1279 } 1280 if (mActive) { 1281 result = mAudioTrack->start(0); // callback thread hasn't changed 1282 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() start() failed status %d", result); 1283 } 1284 if (fromStart && result == NO_ERROR) { 1285 mNewPosition = mCblk->server + mUpdatePeriod; 1286 } 1287 } 1288 if (result != NO_ERROR) { 1289 android_atomic_and(~CBLK_RESTORING_ON, &cblk->flags); 1290 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() failed status %d", result); 1291 } 1292 mRestoreStatus = result; 1293 // signal old cblk condition for other threads waiting for restore completion 1294 android_atomic_or(CBLK_RESTORED_ON, &cblk->flags); 1295 cblk->cv.broadcast(); 1296 } else { 1297 if (!(cblk->flags & CBLK_RESTORED_MSK)) { 1298 ALOGW("dead IAudioTrack, waiting for a new one TID %d", gettid()); 1299 mLock.unlock(); 1300 result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS)); 1301 if (result == NO_ERROR) { 1302 result = mRestoreStatus; 1303 } 1304 cblk->lock.unlock(); 1305 mLock.lock(); 1306 } else { 1307 ALOGW("dead IAudioTrack, already restored TID %d", gettid()); 1308 result = mRestoreStatus; 1309 cblk->lock.unlock(); 1310 } 1311 } 1312 ALOGV("restoreTrack_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x", 1313 result, mActive, mCblk, cblk, mCblk->flags, cblk->flags); 1314 1315 if (result == NO_ERROR) { 1316 // from now on we switch to the newly created cblk 1317 cblk = mCblk; 1318 } 1319 cblk->lock.lock(); 1320 1321 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() error %d TID %d", result, gettid()); 1322 1323 return result; 1324} 1325 1326status_t AudioTrack::dump(int fd, const Vector<String16>& args) const 1327{ 1328 1329 const size_t SIZE = 256; 1330 char buffer[SIZE]; 1331 String8 result; 1332 1333 result.append(" AudioTrack::dump\n"); 1334 snprintf(buffer, 255, " stream type(%d), left - right volume(%f, %f)\n", mStreamType, mVolume[0], mVolume[1]); 1335 result.append(buffer); 1336 snprintf(buffer, 255, " format(%d), channel count(%d), frame count(%d)\n", mFormat, mChannelCount, mCblk->frameCount); 1337 result.append(buffer); 1338 snprintf(buffer, 255, " sample rate(%d), status(%d), muted(%d)\n", (mCblk == 0) ? 0 : mCblk->sampleRate, mStatus, mMuted); 1339 result.append(buffer); 1340 snprintf(buffer, 255, " active(%d), latency (%d)\n", mActive, mLatency); 1341 result.append(buffer); 1342 ::write(fd, result.string(), result.size()); 1343 return NO_ERROR; 1344} 1345 1346// ========================================================================= 1347 1348AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava) 1349 : Thread(bCanCallJava), mReceiver(receiver) 1350{ 1351} 1352 1353bool AudioTrack::AudioTrackThread::threadLoop() 1354{ 1355 return mReceiver.processAudioBuffer(this); 1356} 1357 1358status_t AudioTrack::AudioTrackThread::readyToRun() 1359{ 1360 return NO_ERROR; 1361} 1362 1363void AudioTrack::AudioTrackThread::onFirstRef() 1364{ 1365} 1366 1367// ========================================================================= 1368 1369 1370audio_track_cblk_t::audio_track_cblk_t() 1371 : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0), 1372 userBase(0), serverBase(0), buffers(NULL), frameCount(0), 1373 loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), mVolumeLR(0x10001000), 1374 mSendLevel(0), flags(0) 1375{ 1376} 1377 1378uint32_t audio_track_cblk_t::stepUser(uint32_t frameCount) 1379{ 1380 uint32_t u = user; 1381 1382 u += frameCount; 1383 // Ensure that user is never ahead of server for AudioRecord 1384 if (flags & CBLK_DIRECTION_MSK) { 1385 // If stepServer() has been called once, switch to normal obtainBuffer() timeout period 1386 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) { 1387 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1388 } 1389 } else if (u > server) { 1390 ALOGW("stepServer occurred after track reset"); 1391 u = server; 1392 } 1393 1394 if (u >= userBase + this->frameCount) { 1395 userBase += this->frameCount; 1396 } 1397 1398 user = u; 1399 1400 // Clear flow control error condition as new data has been written/read to/from buffer. 1401 if (flags & CBLK_UNDERRUN_MSK) { 1402 android_atomic_and(~CBLK_UNDERRUN_MSK, &flags); 1403 } 1404 1405 return u; 1406} 1407 1408bool audio_track_cblk_t::stepServer(uint32_t frameCount) 1409{ 1410 if (!tryLock()) { 1411 ALOGW("stepServer() could not lock cblk"); 1412 return false; 1413 } 1414 1415 uint32_t s = server; 1416 1417 s += frameCount; 1418 if (flags & CBLK_DIRECTION_MSK) { 1419 // Mark that we have read the first buffer so that next time stepUser() is called 1420 // we switch to normal obtainBuffer() timeout period 1421 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) { 1422 bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1; 1423 } 1424 // It is possible that we receive a flush() 1425 // while the mixer is processing a block: in this case, 1426 // stepServer() is called After the flush() has reset u & s and 1427 // we have s > u 1428 if (s > user) { 1429 ALOGW("stepServer occurred after track reset"); 1430 s = user; 1431 } 1432 } 1433 1434 if (s >= loopEnd) { 1435 ALOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd); 1436 s = loopStart; 1437 if (--loopCount == 0) { 1438 loopEnd = UINT_MAX; 1439 loopStart = UINT_MAX; 1440 } 1441 } 1442 if (s >= serverBase + this->frameCount) { 1443 serverBase += this->frameCount; 1444 } 1445 1446 server = s; 1447 1448 if (!(flags & CBLK_INVALID_MSK)) { 1449 cv.signal(); 1450 } 1451 lock.unlock(); 1452 return true; 1453} 1454 1455void* audio_track_cblk_t::buffer(uint32_t offset) const 1456{ 1457 return (int8_t *)buffers + (offset - userBase) * frameSize; 1458} 1459 1460uint32_t audio_track_cblk_t::framesAvailable() 1461{ 1462 Mutex::Autolock _l(lock); 1463 return framesAvailable_l(); 1464} 1465 1466uint32_t audio_track_cblk_t::framesAvailable_l() 1467{ 1468 uint32_t u = user; 1469 uint32_t s = server; 1470 1471 if (flags & CBLK_DIRECTION_MSK) { 1472 uint32_t limit = (s < loopStart) ? s : loopStart; 1473 return limit + frameCount - u; 1474 } else { 1475 return frameCount + u - s; 1476 } 1477} 1478 1479uint32_t audio_track_cblk_t::framesReady() 1480{ 1481 uint32_t u = user; 1482 uint32_t s = server; 1483 1484 if (flags & CBLK_DIRECTION_MSK) { 1485 if (u < loopEnd) { 1486 return u - s; 1487 } else { 1488 // do not block on mutex shared with client on AudioFlinger side 1489 if (!tryLock()) { 1490 ALOGW("framesReady() could not lock cblk"); 1491 return 0; 1492 } 1493 uint32_t frames = UINT_MAX; 1494 if (loopCount >= 0) { 1495 frames = (loopEnd - loopStart)*loopCount + u - s; 1496 } 1497 lock.unlock(); 1498 return frames; 1499 } 1500 } else { 1501 return s - u; 1502 } 1503} 1504 1505bool audio_track_cblk_t::tryLock() 1506{ 1507 // the code below simulates lock-with-timeout 1508 // we MUST do this to protect the AudioFlinger server 1509 // as this lock is shared with the client. 1510 status_t err; 1511 1512 err = lock.tryLock(); 1513 if (err == -EBUSY) { // just wait a bit 1514 usleep(1000); 1515 err = lock.tryLock(); 1516 } 1517 if (err != NO_ERROR) { 1518 // probably, the client just died. 1519 return false; 1520 } 1521 return true; 1522} 1523 1524// ------------------------------------------------------------------------- 1525 1526}; // namespace android 1527