AudioTrack.cpp revision ea7939a079b3600cab955760839b021326f8cfc3
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 } 197 198 uint32_t afLatency; 199 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 200 return NO_INIT; 201 } 202 203 // handle default values first. 204 if (streamType == AUDIO_STREAM_DEFAULT) { 205 streamType = AUDIO_STREAM_MUSIC; 206 } 207 208 if (sampleRate == 0) { 209 sampleRate = afSampleRate; 210 } 211 212 // these below should probably come from the audioFlinger too... 213 if (format == AUDIO_FORMAT_DEFAULT) { 214 format = AUDIO_FORMAT_PCM_16_BIT; 215 } 216 if (channelMask == 0) { 217 channelMask = AUDIO_CHANNEL_OUT_STEREO; 218 } 219 220 // validate parameters 221 if (!audio_is_valid_format(format)) { 222 ALOGE("Invalid format"); 223 return BAD_VALUE; 224 } 225 226 // force direct flag if format is not linear PCM 227 if (!audio_is_linear_pcm(format)) { 228 flags = (audio_policy_output_flags_t) (flags | AUDIO_POLICY_OUTPUT_FLAG_DIRECT); 229 } 230 231 if (!audio_is_output_channel(channelMask)) { 232 ALOGE("Invalid channel mask"); 233 return BAD_VALUE; 234 } 235 uint32_t channelCount = popcount(channelMask); 236 237 audio_io_handle_t output = AudioSystem::getOutput( 238 streamType, 239 sampleRate, format, channelMask, 240 flags); 241 242 if (output == 0) { 243 ALOGE("Could not get audio output for stream type %d", streamType); 244 return BAD_VALUE; 245 } 246 247 mVolume[LEFT] = 1.0f; 248 mVolume[RIGHT] = 1.0f; 249 mSendLevel = 0.0f; 250 mFrameCount = frameCount; 251 mNotificationFramesReq = notificationFrames; 252 mSessionId = sessionId; 253 mAuxEffectId = 0; 254 255 // create the IAudioTrack 256 status_t status = createTrack_l(streamType, 257 sampleRate, 258 format, 259 (uint32_t)channelMask, 260 frameCount, 261 flags, 262 sharedBuffer, 263 output, 264 true); 265 266 if (status != NO_ERROR) { 267 return status; 268 } 269 270 if (cbf != NULL) { 271 mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava); 272 } 273 274 mStatus = NO_ERROR; 275 276 mStreamType = streamType; 277 mFormat = format; 278 mChannelMask = (uint32_t)channelMask; 279 mChannelCount = channelCount; 280 mSharedBuffer = sharedBuffer; 281 mMuted = false; 282 mActive = false; 283 mCbf = cbf; 284 mUserData = user; 285 mLoopCount = 0; 286 mMarkerPosition = 0; 287 mMarkerReached = false; 288 mNewPosition = 0; 289 mUpdatePeriod = 0; 290 mFlushed = false; 291 mFlags = flags; 292 AudioSystem::acquireAudioSessionId(mSessionId); 293 mRestoreStatus = NO_ERROR; 294 return NO_ERROR; 295} 296 297status_t AudioTrack::initCheck() const 298{ 299 return mStatus; 300} 301 302// ------------------------------------------------------------------------- 303 304uint32_t AudioTrack::latency() const 305{ 306 return mLatency; 307} 308 309audio_stream_type_t AudioTrack::streamType() const 310{ 311 return mStreamType; 312} 313 314audio_format_t AudioTrack::format() const 315{ 316 return mFormat; 317} 318 319int AudioTrack::channelCount() const 320{ 321 return mChannelCount; 322} 323 324uint32_t AudioTrack::frameCount() const 325{ 326 return mCblk->frameCount; 327} 328 329size_t AudioTrack::frameSize() const 330{ 331 if (audio_is_linear_pcm(mFormat)) { 332 return channelCount()*audio_bytes_per_sample(mFormat); 333 } else { 334 return sizeof(uint8_t); 335 } 336} 337 338sp<IMemory>& AudioTrack::sharedBuffer() 339{ 340 return mSharedBuffer; 341} 342 343// ------------------------------------------------------------------------- 344 345void AudioTrack::start() 346{ 347 sp<AudioTrackThread> t = mAudioTrackThread; 348 status_t status = NO_ERROR; 349 350 ALOGV("start %p", this); 351 if (t != 0) { 352 if (t->exitPending()) { 353 if (t->requestExitAndWait() == WOULD_BLOCK) { 354 ALOGE("AudioTrack::start called from thread"); 355 return; 356 } 357 } 358 } 359 360 AutoMutex lock(mLock); 361 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 362 // while we are accessing the cblk 363 sp<IAudioTrack> audioTrack = mAudioTrack; 364 sp<IMemory> iMem = mCblkMemory; 365 audio_track_cblk_t* cblk = mCblk; 366 367 if (!mActive) { 368 mFlushed = false; 369 mActive = true; 370 mNewPosition = cblk->server + mUpdatePeriod; 371 cblk->lock.lock(); 372 cblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 373 cblk->waitTimeMs = 0; 374 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 375 pid_t tid; 376 if (t != 0) { 377 t->run("AudioTrack", ANDROID_PRIORITY_AUDIO); 378 tid = t->getTid(); // pid_t is unknown until run() 379 ALOGV("getTid=%d", tid); 380 if (tid == -1) { 381 tid = 0; 382 } 383 } else { 384 mPreviousPriority = getpriority(PRIO_PROCESS, 0); 385 mPreviousSchedulingGroup = androidGetThreadSchedulingGroup(0); 386 androidSetThreadPriority(0, ANDROID_PRIORITY_AUDIO); 387 tid = 0; // not gettid() 388 } 389 390 ALOGV("start %p before lock cblk %p", this, mCblk); 391 if (!(cblk->flags & CBLK_INVALID_MSK)) { 392 cblk->lock.unlock(); 393 ALOGV("mAudioTrack->start(tid=%d)", tid); 394 status = mAudioTrack->start(tid); 395 cblk->lock.lock(); 396 if (status == DEAD_OBJECT) { 397 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 398 } 399 } 400 if (cblk->flags & CBLK_INVALID_MSK) { 401 status = restoreTrack_l(cblk, true); 402 } 403 cblk->lock.unlock(); 404 if (status != NO_ERROR) { 405 ALOGV("start() failed"); 406 mActive = false; 407 if (t != 0) { 408 t->requestExit(); 409 } else { 410 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 411 androidSetThreadSchedulingGroup(0, mPreviousSchedulingGroup); 412 } 413 } 414 } 415 416} 417 418void AudioTrack::stop() 419{ 420 sp<AudioTrackThread> t = mAudioTrackThread; 421 422 ALOGV("stop %p", this); 423 424 AutoMutex lock(mLock); 425 if (mActive) { 426 mActive = false; 427 mCblk->cv.signal(); 428 mAudioTrack->stop(); 429 // Cancel loops (If we are in the middle of a loop, playback 430 // would not stop until loopCount reaches 0). 431 setLoop_l(0, 0, 0); 432 // the playback head position will reset to 0, so if a marker is set, we need 433 // to activate it again 434 mMarkerReached = false; 435 // Force flush if a shared buffer is used otherwise audioflinger 436 // will not stop before end of buffer is reached. 437 if (mSharedBuffer != 0) { 438 flush_l(); 439 } 440 if (t != 0) { 441 t->requestExit(); 442 } else { 443 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 444 androidSetThreadSchedulingGroup(0, mPreviousSchedulingGroup); 445 } 446 } 447 448} 449 450bool AudioTrack::stopped() const 451{ 452 AutoMutex lock(mLock); 453 return stopped_l(); 454} 455 456void AudioTrack::flush() 457{ 458 AutoMutex lock(mLock); 459 flush_l(); 460} 461 462// must be called with mLock held 463void AudioTrack::flush_l() 464{ 465 ALOGV("flush"); 466 467 // clear playback marker and periodic update counter 468 mMarkerPosition = 0; 469 mMarkerReached = false; 470 mUpdatePeriod = 0; 471 472 if (!mActive) { 473 mFlushed = true; 474 mAudioTrack->flush(); 475 // Release AudioTrack callback thread in case it was waiting for new buffers 476 // in AudioTrack::obtainBuffer() 477 mCblk->cv.signal(); 478 } 479} 480 481void AudioTrack::pause() 482{ 483 ALOGV("pause"); 484 AutoMutex lock(mLock); 485 if (mActive) { 486 mActive = false; 487 mAudioTrack->pause(); 488 } 489} 490 491void AudioTrack::mute(bool e) 492{ 493 mAudioTrack->mute(e); 494 mMuted = e; 495} 496 497bool AudioTrack::muted() const 498{ 499 return mMuted; 500} 501 502status_t AudioTrack::setVolume(float left, float right) 503{ 504 if (left < 0.0f || left > 1.0f || right < 0.0f || right > 1.0f) { 505 return BAD_VALUE; 506 } 507 508 AutoMutex lock(mLock); 509 mVolume[LEFT] = left; 510 mVolume[RIGHT] = right; 511 512 mCblk->setVolumeLR((uint32_t(uint16_t(right * 0x1000)) << 16) | uint16_t(left * 0x1000)); 513 514 return NO_ERROR; 515} 516 517void AudioTrack::getVolume(float* left, float* right) const 518{ 519 if (left != NULL) { 520 *left = mVolume[LEFT]; 521 } 522 if (right != NULL) { 523 *right = mVolume[RIGHT]; 524 } 525} 526 527status_t AudioTrack::setAuxEffectSendLevel(float level) 528{ 529 ALOGV("setAuxEffectSendLevel(%f)", level); 530 if (level < 0.0f || level > 1.0f) { 531 return BAD_VALUE; 532 } 533 AutoMutex lock(mLock); 534 535 mSendLevel = level; 536 537 mCblk->setSendLevel(level); 538 539 return NO_ERROR; 540} 541 542void AudioTrack::getAuxEffectSendLevel(float* level) const 543{ 544 if (level != NULL) { 545 *level = mSendLevel; 546 } 547} 548 549status_t AudioTrack::setSampleRate(int rate) 550{ 551 int afSamplingRate; 552 553 if (mIsTimed) { 554 return INVALID_OPERATION; 555 } 556 557 if (AudioSystem::getOutputSamplingRate(&afSamplingRate, mStreamType) != NO_ERROR) { 558 return NO_INIT; 559 } 560 // Resampler implementation limits input sampling rate to 2 x output sampling rate. 561 if (rate <= 0 || rate > afSamplingRate*2 ) return BAD_VALUE; 562 563 AutoMutex lock(mLock); 564 mCblk->sampleRate = rate; 565 return NO_ERROR; 566} 567 568uint32_t AudioTrack::getSampleRate() const 569{ 570 if (mIsTimed) { 571 return INVALID_OPERATION; 572 } 573 574 AutoMutex lock(mLock); 575 return mCblk->sampleRate; 576} 577 578status_t AudioTrack::setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount) 579{ 580 AutoMutex lock(mLock); 581 return setLoop_l(loopStart, loopEnd, loopCount); 582} 583 584// must be called with mLock held 585status_t AudioTrack::setLoop_l(uint32_t loopStart, uint32_t loopEnd, int loopCount) 586{ 587 audio_track_cblk_t* cblk = mCblk; 588 589 Mutex::Autolock _l(cblk->lock); 590 591 if (loopCount == 0) { 592 cblk->loopStart = UINT_MAX; 593 cblk->loopEnd = UINT_MAX; 594 cblk->loopCount = 0; 595 mLoopCount = 0; 596 return NO_ERROR; 597 } 598 599 if (mIsTimed) { 600 return INVALID_OPERATION; 601 } 602 603 if (loopStart >= loopEnd || 604 loopEnd - loopStart > cblk->frameCount || 605 cblk->server > loopStart) { 606 ALOGE("setLoop invalid value: loopStart %d, loopEnd %d, loopCount %d, framecount %d, user %d", loopStart, loopEnd, loopCount, cblk->frameCount, cblk->user); 607 return BAD_VALUE; 608 } 609 610 if ((mSharedBuffer != 0) && (loopEnd > cblk->frameCount)) { 611 ALOGE("setLoop invalid value: loop markers beyond data: loopStart %d, loopEnd %d, framecount %d", 612 loopStart, loopEnd, cblk->frameCount); 613 return BAD_VALUE; 614 } 615 616 cblk->loopStart = loopStart; 617 cblk->loopEnd = loopEnd; 618 cblk->loopCount = loopCount; 619 mLoopCount = loopCount; 620 621 return NO_ERROR; 622} 623 624status_t AudioTrack::setMarkerPosition(uint32_t marker) 625{ 626 if (mCbf == NULL) return INVALID_OPERATION; 627 628 mMarkerPosition = marker; 629 mMarkerReached = false; 630 631 return NO_ERROR; 632} 633 634status_t AudioTrack::getMarkerPosition(uint32_t *marker) const 635{ 636 if (marker == NULL) return BAD_VALUE; 637 638 *marker = mMarkerPosition; 639 640 return NO_ERROR; 641} 642 643status_t AudioTrack::setPositionUpdatePeriod(uint32_t updatePeriod) 644{ 645 if (mCbf == NULL) return INVALID_OPERATION; 646 647 uint32_t curPosition; 648 getPosition(&curPosition); 649 mNewPosition = curPosition + updatePeriod; 650 mUpdatePeriod = updatePeriod; 651 652 return NO_ERROR; 653} 654 655status_t AudioTrack::getPositionUpdatePeriod(uint32_t *updatePeriod) const 656{ 657 if (updatePeriod == NULL) return BAD_VALUE; 658 659 *updatePeriod = mUpdatePeriod; 660 661 return NO_ERROR; 662} 663 664status_t AudioTrack::setPosition(uint32_t position) 665{ 666 if (mIsTimed) return INVALID_OPERATION; 667 668 AutoMutex lock(mLock); 669 670 if (!stopped_l()) return INVALID_OPERATION; 671 672 Mutex::Autolock _l(mCblk->lock); 673 674 if (position > mCblk->user) return BAD_VALUE; 675 676 mCblk->server = position; 677 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 678 679 return NO_ERROR; 680} 681 682status_t AudioTrack::getPosition(uint32_t *position) 683{ 684 if (position == NULL) return BAD_VALUE; 685 AutoMutex lock(mLock); 686 *position = mFlushed ? 0 : mCblk->server; 687 688 return NO_ERROR; 689} 690 691status_t AudioTrack::reload() 692{ 693 AutoMutex lock(mLock); 694 695 if (!stopped_l()) return INVALID_OPERATION; 696 697 flush_l(); 698 699 mCblk->stepUser(mCblk->frameCount); 700 701 return NO_ERROR; 702} 703 704audio_io_handle_t AudioTrack::getOutput() 705{ 706 AutoMutex lock(mLock); 707 return getOutput_l(); 708} 709 710// must be called with mLock held 711audio_io_handle_t AudioTrack::getOutput_l() 712{ 713 return AudioSystem::getOutput(mStreamType, 714 mCblk->sampleRate, mFormat, mChannelMask, mFlags); 715} 716 717int AudioTrack::getSessionId() const 718{ 719 return mSessionId; 720} 721 722status_t AudioTrack::attachAuxEffect(int effectId) 723{ 724 ALOGV("attachAuxEffect(%d)", effectId); 725 status_t status = mAudioTrack->attachAuxEffect(effectId); 726 if (status == NO_ERROR) { 727 mAuxEffectId = effectId; 728 } 729 return status; 730} 731 732// ------------------------------------------------------------------------- 733 734// must be called with mLock held 735status_t AudioTrack::createTrack_l( 736 audio_stream_type_t streamType, 737 uint32_t sampleRate, 738 audio_format_t format, 739 uint32_t channelMask, 740 int frameCount, 741 audio_policy_output_flags_t flags, 742 const sp<IMemory>& sharedBuffer, 743 audio_io_handle_t output, 744 bool enforceFrameCount) 745{ 746 status_t status; 747 const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger(); 748 if (audioFlinger == 0) { 749 ALOGE("Could not get audioflinger"); 750 return NO_INIT; 751 } 752 753 int afSampleRate; 754 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 755 return NO_INIT; 756 } 757 int afFrameCount; 758 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 759 return NO_INIT; 760 } 761 uint32_t afLatency; 762 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 763 return NO_INIT; 764 } 765 766 mNotificationFramesAct = mNotificationFramesReq; 767 if (!audio_is_linear_pcm(format)) { 768 if (sharedBuffer != 0) { 769 frameCount = sharedBuffer->size(); 770 } 771 } else { 772 // Ensure that buffer depth covers at least audio hardware latency 773 uint32_t minBufCount = afLatency / ((1000 * afFrameCount)/afSampleRate); 774 if (minBufCount < 2) minBufCount = 2; 775 776 int minFrameCount = (afFrameCount*sampleRate*minBufCount)/afSampleRate; 777 778 if (sharedBuffer == 0) { 779 if (frameCount == 0) { 780 frameCount = minFrameCount; 781 } 782 if (mNotificationFramesAct == 0) { 783 mNotificationFramesAct = frameCount/2; 784 } 785 // Make sure that application is notified with sufficient margin 786 // before underrun 787 if (mNotificationFramesAct > (uint32_t)frameCount/2) { 788 mNotificationFramesAct = frameCount/2; 789 } 790 if (frameCount < minFrameCount) { 791 ALOGW_IF(enforceFrameCount, "Minimum buffer size corrected from %d to %d", 792 frameCount, minFrameCount); 793 frameCount = minFrameCount; 794 } 795 } else { 796 // Ensure that buffer alignment matches channelCount 797 int channelCount = popcount(channelMask); 798 if (((uint32_t)sharedBuffer->pointer() & (channelCount | 1)) != 0) { 799 ALOGE("Invalid buffer alignement: address %p, channelCount %d", sharedBuffer->pointer(), channelCount); 800 return BAD_VALUE; 801 } 802 frameCount = sharedBuffer->size()/channelCount/sizeof(int16_t); 803 } 804 } 805 806 sp<IAudioTrack> track = audioFlinger->createTrack(getpid(), 807 streamType, 808 sampleRate, 809 format, 810 channelMask, 811 frameCount, 812 ((uint16_t)flags) << 16, 813 sharedBuffer, 814 output, 815 mIsTimed, 816 &mSessionId, 817 &status); 818 819 if (track == 0) { 820 ALOGE("AudioFlinger could not create track, status: %d", status); 821 return status; 822 } 823 sp<IMemory> cblk = track->getCblk(); 824 if (cblk == 0) { 825 ALOGE("Could not get control block"); 826 return NO_INIT; 827 } 828 mAudioTrack = track; 829 mCblkMemory = cblk; 830 mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer()); 831 android_atomic_or(CBLK_DIRECTION_OUT, &mCblk->flags); 832 if (sharedBuffer == 0) { 833 mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t); 834 } else { 835 mCblk->buffers = sharedBuffer->pointer(); 836 // Force buffer full condition as data is already present in shared memory 837 mCblk->stepUser(mCblk->frameCount); 838 } 839 840 mCblk->setVolumeLR((uint32_t(uint16_t(mVolume[RIGHT] * 0x1000)) << 16) | uint16_t(mVolume[LEFT] * 0x1000)); 841 mCblk->setSendLevel(mSendLevel); 842 mAudioTrack->attachAuxEffect(mAuxEffectId); 843 mCblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 844 mCblk->waitTimeMs = 0; 845 mRemainingFrames = mNotificationFramesAct; 846 mLatency = afLatency + (1000*mCblk->frameCount) / sampleRate; 847 return NO_ERROR; 848} 849 850status_t AudioTrack::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 851{ 852 AutoMutex lock(mLock); 853 bool active; 854 status_t result = NO_ERROR; 855 audio_track_cblk_t* cblk = mCblk; 856 uint32_t framesReq = audioBuffer->frameCount; 857 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 858 859 audioBuffer->frameCount = 0; 860 audioBuffer->size = 0; 861 862 uint32_t framesAvail = cblk->framesAvailable(); 863 864 cblk->lock.lock(); 865 if (cblk->flags & CBLK_INVALID_MSK) { 866 goto create_new_track; 867 } 868 cblk->lock.unlock(); 869 870 if (framesAvail == 0) { 871 cblk->lock.lock(); 872 goto start_loop_here; 873 while (framesAvail == 0) { 874 active = mActive; 875 if (CC_UNLIKELY(!active)) { 876 ALOGV("Not active and NO_MORE_BUFFERS"); 877 cblk->lock.unlock(); 878 return NO_MORE_BUFFERS; 879 } 880 if (CC_UNLIKELY(!waitCount)) { 881 cblk->lock.unlock(); 882 return WOULD_BLOCK; 883 } 884 if (!(cblk->flags & CBLK_INVALID_MSK)) { 885 mLock.unlock(); 886 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 887 cblk->lock.unlock(); 888 mLock.lock(); 889 if (!mActive) { 890 return status_t(STOPPED); 891 } 892 cblk->lock.lock(); 893 } 894 895 if (cblk->flags & CBLK_INVALID_MSK) { 896 goto create_new_track; 897 } 898 if (CC_UNLIKELY(result != NO_ERROR)) { 899 cblk->waitTimeMs += waitTimeMs; 900 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 901 // timing out when a loop has been set and we have already written upto loop end 902 // is a normal condition: no need to wake AudioFlinger up. 903 if (cblk->user < cblk->loopEnd) { 904 ALOGW( "obtainBuffer timed out (is the CPU pegged?) %p " 905 "user=%08x, server=%08x", this, cblk->user, cblk->server); 906 //unlock cblk mutex before calling mAudioTrack->start() (see issue #1617140) 907 cblk->lock.unlock(); 908 result = mAudioTrack->start(0); // callback thread hasn't changed 909 cblk->lock.lock(); 910 if (result == DEAD_OBJECT) { 911 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 912create_new_track: 913 result = restoreTrack_l(cblk, false); 914 } 915 if (result != NO_ERROR) { 916 ALOGW("obtainBuffer create Track error %d", result); 917 cblk->lock.unlock(); 918 return result; 919 } 920 } 921 cblk->waitTimeMs = 0; 922 } 923 924 if (--waitCount == 0) { 925 cblk->lock.unlock(); 926 return TIMED_OUT; 927 } 928 } 929 // read the server count again 930 start_loop_here: 931 framesAvail = cblk->framesAvailable_l(); 932 } 933 cblk->lock.unlock(); 934 } 935 936 // restart track if it was disabled by audioflinger due to previous underrun 937 if (mActive && (cblk->flags & CBLK_DISABLED_MSK)) { 938 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 939 ALOGW("obtainBuffer() track %p disabled, restarting", this); 940 mAudioTrack->start(0); // callback thread hasn't changed 941 } 942 943 cblk->waitTimeMs = 0; 944 945 if (framesReq > framesAvail) { 946 framesReq = framesAvail; 947 } 948 949 uint32_t u = cblk->user; 950 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 951 952 if (u + framesReq > bufferEnd) { 953 framesReq = bufferEnd - u; 954 } 955 956 audioBuffer->flags = mMuted ? Buffer::MUTE : 0; 957 audioBuffer->channelCount = mChannelCount; 958 audioBuffer->frameCount = framesReq; 959 audioBuffer->size = framesReq * cblk->frameSize; 960 if (audio_is_linear_pcm(mFormat)) { 961 audioBuffer->format = AUDIO_FORMAT_PCM_16_BIT; 962 } else { 963 audioBuffer->format = mFormat; 964 } 965 audioBuffer->raw = (int8_t *)cblk->buffer(u); 966 active = mActive; 967 return active ? status_t(NO_ERROR) : status_t(STOPPED); 968} 969 970void AudioTrack::releaseBuffer(Buffer* audioBuffer) 971{ 972 AutoMutex lock(mLock); 973 mCblk->stepUser(audioBuffer->frameCount); 974} 975 976// ------------------------------------------------------------------------- 977 978ssize_t AudioTrack::write(const void* buffer, size_t userSize) 979{ 980 981 if (mSharedBuffer != 0) return INVALID_OPERATION; 982 if (mIsTimed) return INVALID_OPERATION; 983 984 if (ssize_t(userSize) < 0) { 985 // Sanity-check: user is most-likely passing an error code, and it would 986 // make the return value ambiguous (actualSize vs error). 987 ALOGE("AudioTrack::write(buffer=%p, size=%u (%d)", 988 buffer, userSize, userSize); 989 return BAD_VALUE; 990 } 991 992 ALOGV("write %p: %d bytes, mActive=%d", this, userSize, mActive); 993 994 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 995 // while we are accessing the cblk 996 mLock.lock(); 997 sp<IAudioTrack> audioTrack = mAudioTrack; 998 sp<IMemory> iMem = mCblkMemory; 999 mLock.unlock(); 1000 1001 ssize_t written = 0; 1002 const int8_t *src = (const int8_t *)buffer; 1003 Buffer audioBuffer; 1004 size_t frameSz = frameSize(); 1005 1006 do { 1007 audioBuffer.frameCount = userSize/frameSz; 1008 1009 status_t err = obtainBuffer(&audioBuffer, -1); 1010 if (err < 0) { 1011 // out of buffers, return #bytes written 1012 if (err == status_t(NO_MORE_BUFFERS)) 1013 break; 1014 return ssize_t(err); 1015 } 1016 1017 size_t toWrite; 1018 1019 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1020 // Divide capacity by 2 to take expansion into account 1021 toWrite = audioBuffer.size>>1; 1022 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) src, toWrite); 1023 } else { 1024 toWrite = audioBuffer.size; 1025 memcpy(audioBuffer.i8, src, toWrite); 1026 src += toWrite; 1027 } 1028 userSize -= toWrite; 1029 written += toWrite; 1030 1031 releaseBuffer(&audioBuffer); 1032 } while (userSize >= frameSz); 1033 1034 return written; 1035} 1036 1037// ------------------------------------------------------------------------- 1038 1039TimedAudioTrack::TimedAudioTrack() { 1040 mIsTimed = true; 1041} 1042 1043status_t TimedAudioTrack::allocateTimedBuffer(size_t size, sp<IMemory>* buffer) 1044{ 1045 status_t result = UNKNOWN_ERROR; 1046 1047 // If the track is not invalid already, try to allocate a buffer. alloc 1048 // fails indicating that the server is dead, flag the track as invalid so 1049 // we can attempt to restore in in just a bit. 1050 if (!(mCblk->flags & CBLK_INVALID_MSK)) { 1051 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1052 if (result == DEAD_OBJECT) { 1053 android_atomic_or(CBLK_INVALID_ON, &mCblk->flags); 1054 } 1055 } 1056 1057 // If the track is invalid at this point, attempt to restore it. and try the 1058 // allocation one more time. 1059 if (mCblk->flags & CBLK_INVALID_MSK) { 1060 mCblk->lock.lock(); 1061 result = restoreTrack_l(mCblk, false); 1062 mCblk->lock.unlock(); 1063 1064 if (result == OK) 1065 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1066 } 1067 1068 return result; 1069} 1070 1071status_t TimedAudioTrack::queueTimedBuffer(const sp<IMemory>& buffer, 1072 int64_t pts) 1073{ 1074 // restart track if it was disabled by audioflinger due to previous underrun 1075 if (mActive && (mCblk->flags & CBLK_DISABLED_MSK)) { 1076 android_atomic_and(~CBLK_DISABLED_ON, &mCblk->flags); 1077 ALOGW("queueTimedBuffer() track %p disabled, restarting", this); 1078 mAudioTrack->start(0); 1079 } 1080 1081 return mAudioTrack->queueTimedBuffer(buffer, pts); 1082} 1083 1084status_t TimedAudioTrack::setMediaTimeTransform(const LinearTransform& xform, 1085 TargetTimeline target) 1086{ 1087 return mAudioTrack->setMediaTimeTransform(xform, target); 1088} 1089 1090// ------------------------------------------------------------------------- 1091 1092bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 1093{ 1094 Buffer audioBuffer; 1095 uint32_t frames; 1096 size_t writtenSize; 1097 1098 mLock.lock(); 1099 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1100 // while we are accessing the cblk 1101 sp<IAudioTrack> audioTrack = mAudioTrack; 1102 sp<IMemory> iMem = mCblkMemory; 1103 audio_track_cblk_t* cblk = mCblk; 1104 bool active = mActive; 1105 mLock.unlock(); 1106 1107 // Manage underrun callback 1108 if (active && (cblk->framesAvailable() == cblk->frameCount)) { 1109 ALOGV("Underrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags); 1110 if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) { 1111 mCbf(EVENT_UNDERRUN, mUserData, 0); 1112 if (cblk->server == cblk->frameCount) { 1113 mCbf(EVENT_BUFFER_END, mUserData, 0); 1114 } 1115 if (mSharedBuffer != 0) return false; 1116 } 1117 } 1118 1119 // Manage loop end callback 1120 while (mLoopCount > cblk->loopCount) { 1121 int loopCount = -1; 1122 mLoopCount--; 1123 if (mLoopCount >= 0) loopCount = mLoopCount; 1124 1125 mCbf(EVENT_LOOP_END, mUserData, (void *)&loopCount); 1126 } 1127 1128 // Manage marker callback 1129 if (!mMarkerReached && (mMarkerPosition > 0)) { 1130 if (cblk->server >= mMarkerPosition) { 1131 mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition); 1132 mMarkerReached = true; 1133 } 1134 } 1135 1136 // Manage new position callback 1137 if (mUpdatePeriod > 0) { 1138 while (cblk->server >= mNewPosition) { 1139 mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition); 1140 mNewPosition += mUpdatePeriod; 1141 } 1142 } 1143 1144 // If Shared buffer is used, no data is requested from client. 1145 if (mSharedBuffer != 0) { 1146 frames = 0; 1147 } else { 1148 frames = mRemainingFrames; 1149 } 1150 1151 // See description of waitCount parameter at declaration of obtainBuffer(). 1152 // The logic below prevents us from being stuck below at obtainBuffer() 1153 // not being able to handle timed events (position, markers, loops). 1154 int32_t waitCount = -1; 1155 if (mUpdatePeriod || (!mMarkerReached && mMarkerPosition) || mLoopCount) { 1156 waitCount = 1; 1157 } 1158 1159 do { 1160 1161 audioBuffer.frameCount = frames; 1162 1163 status_t err = obtainBuffer(&audioBuffer, waitCount); 1164 if (err < NO_ERROR) { 1165 if (err != TIMED_OUT) { 1166 ALOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up."); 1167 return false; 1168 } 1169 break; 1170 } 1171 if (err == status_t(STOPPED)) return false; 1172 1173 // Divide buffer size by 2 to take into account the expansion 1174 // due to 8 to 16 bit conversion: the callback must fill only half 1175 // of the destination buffer 1176 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1177 audioBuffer.size >>= 1; 1178 } 1179 1180 size_t reqSize = audioBuffer.size; 1181 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 1182 writtenSize = audioBuffer.size; 1183 1184 // Sanity check on returned size 1185 if (ssize_t(writtenSize) <= 0) { 1186 // The callback is done filling buffers 1187 // Keep this thread going to handle timed events and 1188 // still try to get more data in intervals of WAIT_PERIOD_MS 1189 // but don't just loop and block the CPU, so wait 1190 usleep(WAIT_PERIOD_MS*1000); 1191 break; 1192 } 1193 if (writtenSize > reqSize) writtenSize = reqSize; 1194 1195 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1196 // 8 to 16 bit conversion, note that source and destination are the same address 1197 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) audioBuffer.i8, writtenSize); 1198 writtenSize <<= 1; 1199 } 1200 1201 audioBuffer.size = writtenSize; 1202 // NOTE: mCblk->frameSize is not equal to AudioTrack::frameSize() for 1203 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of 1204 // 16 bit. 1205 audioBuffer.frameCount = writtenSize/mCblk->frameSize; 1206 1207 frames -= audioBuffer.frameCount; 1208 1209 releaseBuffer(&audioBuffer); 1210 } 1211 while (frames); 1212 1213 if (frames == 0) { 1214 mRemainingFrames = mNotificationFramesAct; 1215 } else { 1216 mRemainingFrames = frames; 1217 } 1218 return true; 1219} 1220 1221// must be called with mLock and cblk.lock held. Callers must also hold strong references on 1222// the IAudioTrack and IMemory in case they are recreated here. 1223// If the IAudioTrack is successfully restored, the cblk pointer is updated 1224status_t AudioTrack::restoreTrack_l(audio_track_cblk_t*& cblk, bool fromStart) 1225{ 1226 status_t result; 1227 1228 if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) { 1229 ALOGW("dead IAudioTrack, creating a new one from %s TID %d", 1230 fromStart ? "start()" : "obtainBuffer()", gettid()); 1231 1232 // signal old cblk condition so that other threads waiting for available buffers stop 1233 // waiting now 1234 cblk->cv.broadcast(); 1235 cblk->lock.unlock(); 1236 1237 // refresh the audio configuration cache in this process to make sure we get new 1238 // output parameters in getOutput_l() and createTrack_l() 1239 AudioSystem::clearAudioConfigCache(); 1240 1241 // if the new IAudioTrack is created, createTrack_l() will modify the 1242 // following member variables: mAudioTrack, mCblkMemory and mCblk. 1243 // It will also delete the strong references on previous IAudioTrack and IMemory 1244 result = createTrack_l(mStreamType, 1245 cblk->sampleRate, 1246 mFormat, 1247 mChannelMask, 1248 mFrameCount, 1249 mFlags, 1250 mSharedBuffer, 1251 getOutput_l(), 1252 false); 1253 1254 if (result == NO_ERROR) { 1255 uint32_t user = cblk->user; 1256 uint32_t server = cblk->server; 1257 // restore write index and set other indexes to reflect empty buffer status 1258 mCblk->user = user; 1259 mCblk->server = user; 1260 mCblk->userBase = user; 1261 mCblk->serverBase = user; 1262 // restore loop: this is not guaranteed to succeed if new frame count is not 1263 // compatible with loop length 1264 setLoop_l(cblk->loopStart, cblk->loopEnd, cblk->loopCount); 1265 if (!fromStart) { 1266 mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1267 // Make sure that a client relying on callback events indicating underrun or 1268 // the actual amount of audio frames played (e.g SoundPool) receives them. 1269 if (mSharedBuffer == 0) { 1270 uint32_t frames = 0; 1271 if (user > server) { 1272 frames = ((user - server) > mCblk->frameCount) ? 1273 mCblk->frameCount : (user - server); 1274 memset(mCblk->buffers, 0, frames * mCblk->frameSize); 1275 } 1276 // restart playback even if buffer is not completely filled. 1277 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 1278 // stepUser() clears CBLK_UNDERRUN_ON flag enabling underrun callbacks to 1279 // the client 1280 mCblk->stepUser(frames); 1281 } 1282 } 1283 if (mActive) { 1284 result = mAudioTrack->start(0); // callback thread hasn't changed 1285 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() start() failed status %d", result); 1286 } 1287 if (fromStart && result == NO_ERROR) { 1288 mNewPosition = mCblk->server + mUpdatePeriod; 1289 } 1290 } 1291 if (result != NO_ERROR) { 1292 android_atomic_and(~CBLK_RESTORING_ON, &cblk->flags); 1293 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() failed status %d", result); 1294 } 1295 mRestoreStatus = result; 1296 // signal old cblk condition for other threads waiting for restore completion 1297 android_atomic_or(CBLK_RESTORED_ON, &cblk->flags); 1298 cblk->cv.broadcast(); 1299 } else { 1300 if (!(cblk->flags & CBLK_RESTORED_MSK)) { 1301 ALOGW("dead IAudioTrack, waiting for a new one TID %d", gettid()); 1302 mLock.unlock(); 1303 result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS)); 1304 if (result == NO_ERROR) { 1305 result = mRestoreStatus; 1306 } 1307 cblk->lock.unlock(); 1308 mLock.lock(); 1309 } else { 1310 ALOGW("dead IAudioTrack, already restored TID %d", gettid()); 1311 result = mRestoreStatus; 1312 cblk->lock.unlock(); 1313 } 1314 } 1315 ALOGV("restoreTrack_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x", 1316 result, mActive, mCblk, cblk, mCblk->flags, cblk->flags); 1317 1318 if (result == NO_ERROR) { 1319 // from now on we switch to the newly created cblk 1320 cblk = mCblk; 1321 } 1322 cblk->lock.lock(); 1323 1324 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() error %d TID %d", result, gettid()); 1325 1326 return result; 1327} 1328 1329status_t AudioTrack::dump(int fd, const Vector<String16>& args) const 1330{ 1331 1332 const size_t SIZE = 256; 1333 char buffer[SIZE]; 1334 String8 result; 1335 1336 result.append(" AudioTrack::dump\n"); 1337 snprintf(buffer, 255, " stream type(%d), left - right volume(%f, %f)\n", mStreamType, mVolume[0], mVolume[1]); 1338 result.append(buffer); 1339 snprintf(buffer, 255, " format(%d), channel count(%d), frame count(%d)\n", mFormat, mChannelCount, mCblk->frameCount); 1340 result.append(buffer); 1341 snprintf(buffer, 255, " sample rate(%d), status(%d), muted(%d)\n", (mCblk == 0) ? 0 : mCblk->sampleRate, mStatus, mMuted); 1342 result.append(buffer); 1343 snprintf(buffer, 255, " active(%d), latency (%d)\n", mActive, mLatency); 1344 result.append(buffer); 1345 ::write(fd, result.string(), result.size()); 1346 return NO_ERROR; 1347} 1348 1349// ========================================================================= 1350 1351AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava) 1352 : Thread(bCanCallJava), mReceiver(receiver) 1353{ 1354} 1355 1356bool AudioTrack::AudioTrackThread::threadLoop() 1357{ 1358 return mReceiver.processAudioBuffer(this); 1359} 1360 1361status_t AudioTrack::AudioTrackThread::readyToRun() 1362{ 1363 return NO_ERROR; 1364} 1365 1366void AudioTrack::AudioTrackThread::onFirstRef() 1367{ 1368} 1369 1370// ========================================================================= 1371 1372 1373audio_track_cblk_t::audio_track_cblk_t() 1374 : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0), 1375 userBase(0), serverBase(0), buffers(NULL), frameCount(0), 1376 loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), mVolumeLR(0x10001000), 1377 mSendLevel(0), flags(0) 1378{ 1379} 1380 1381uint32_t audio_track_cblk_t::stepUser(uint32_t frameCount) 1382{ 1383 uint32_t u = user; 1384 1385 u += frameCount; 1386 // Ensure that user is never ahead of server for AudioRecord 1387 if (flags & CBLK_DIRECTION_MSK) { 1388 // If stepServer() has been called once, switch to normal obtainBuffer() timeout period 1389 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) { 1390 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1391 } 1392 } else if (u > server) { 1393 ALOGW("stepServer occurred after track reset"); 1394 u = server; 1395 } 1396 1397 if (u >= userBase + this->frameCount) { 1398 userBase += this->frameCount; 1399 } 1400 1401 user = u; 1402 1403 // Clear flow control error condition as new data has been written/read to/from buffer. 1404 if (flags & CBLK_UNDERRUN_MSK) { 1405 android_atomic_and(~CBLK_UNDERRUN_MSK, &flags); 1406 } 1407 1408 return u; 1409} 1410 1411bool audio_track_cblk_t::stepServer(uint32_t frameCount) 1412{ 1413 if (!tryLock()) { 1414 ALOGW("stepServer() could not lock cblk"); 1415 return false; 1416 } 1417 1418 uint32_t s = server; 1419 1420 s += frameCount; 1421 if (flags & CBLK_DIRECTION_MSK) { 1422 // Mark that we have read the first buffer so that next time stepUser() is called 1423 // we switch to normal obtainBuffer() timeout period 1424 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) { 1425 bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1; 1426 } 1427 // It is possible that we receive a flush() 1428 // while the mixer is processing a block: in this case, 1429 // stepServer() is called After the flush() has reset u & s and 1430 // we have s > u 1431 if (s > user) { 1432 ALOGW("stepServer occurred after track reset"); 1433 s = user; 1434 } 1435 } 1436 1437 if (s >= loopEnd) { 1438 ALOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd); 1439 s = loopStart; 1440 if (--loopCount == 0) { 1441 loopEnd = UINT_MAX; 1442 loopStart = UINT_MAX; 1443 } 1444 } 1445 if (s >= serverBase + this->frameCount) { 1446 serverBase += this->frameCount; 1447 } 1448 1449 server = s; 1450 1451 if (!(flags & CBLK_INVALID_MSK)) { 1452 cv.signal(); 1453 } 1454 lock.unlock(); 1455 return true; 1456} 1457 1458void* audio_track_cblk_t::buffer(uint32_t offset) const 1459{ 1460 return (int8_t *)buffers + (offset - userBase) * frameSize; 1461} 1462 1463uint32_t audio_track_cblk_t::framesAvailable() 1464{ 1465 Mutex::Autolock _l(lock); 1466 return framesAvailable_l(); 1467} 1468 1469uint32_t audio_track_cblk_t::framesAvailable_l() 1470{ 1471 uint32_t u = user; 1472 uint32_t s = server; 1473 1474 if (flags & CBLK_DIRECTION_MSK) { 1475 uint32_t limit = (s < loopStart) ? s : loopStart; 1476 return limit + frameCount - u; 1477 } else { 1478 return frameCount + u - s; 1479 } 1480} 1481 1482uint32_t audio_track_cblk_t::framesReady() 1483{ 1484 uint32_t u = user; 1485 uint32_t s = server; 1486 1487 if (flags & CBLK_DIRECTION_MSK) { 1488 if (u < loopEnd) { 1489 return u - s; 1490 } else { 1491 // do not block on mutex shared with client on AudioFlinger side 1492 if (!tryLock()) { 1493 ALOGW("framesReady() could not lock cblk"); 1494 return 0; 1495 } 1496 uint32_t frames = UINT_MAX; 1497 if (loopCount >= 0) { 1498 frames = (loopEnd - loopStart)*loopCount + u - s; 1499 } 1500 lock.unlock(); 1501 return frames; 1502 } 1503 } else { 1504 return s - u; 1505 } 1506} 1507 1508bool audio_track_cblk_t::tryLock() 1509{ 1510 // the code below simulates lock-with-timeout 1511 // we MUST do this to protect the AudioFlinger server 1512 // as this lock is shared with the client. 1513 status_t err; 1514 1515 err = lock.tryLock(); 1516 if (err == -EBUSY) { // just wait a bit 1517 usleep(1000); 1518 err = lock.tryLock(); 1519 } 1520 if (err != NO_ERROR) { 1521 // probably, the client just died. 1522 return false; 1523 } 1524 return true; 1525} 1526 1527// ------------------------------------------------------------------------- 1528 1529}; // namespace android 1530