AudioTrack.cpp revision 4a4a0959bca78e03e3c3f486ba17829c28314d8c
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 /*sharedBuffer*/, false /*threadCanCallJava*/, sessionId); 108} 109 110// DEPRECATED 111AudioTrack::AudioTrack( 112 int streamType, 113 uint32_t sampleRate, 114 int format, 115 int channelMask, 116 int frameCount, 117 uint32_t flags, 118 callback_t cbf, 119 void* user, 120 int notificationFrames, 121 int sessionId) 122 : mStatus(NO_INIT), 123 mIsTimed(false), 124 mPreviousPriority(ANDROID_PRIORITY_NORMAL), mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT) 125{ 126 mStatus = set((audio_stream_type_t)streamType, sampleRate, (audio_format_t)format, channelMask, 127 frameCount, (audio_policy_output_flags_t)flags, cbf, user, notificationFrames, 128 0 /*sharedBuffer*/, false /*threadCanCallJava*/, sessionId); 129} 130 131AudioTrack::AudioTrack( 132 audio_stream_type_t streamType, 133 uint32_t sampleRate, 134 audio_format_t format, 135 int channelMask, 136 const sp<IMemory>& sharedBuffer, 137 audio_policy_output_flags_t flags, 138 callback_t cbf, 139 void* user, 140 int notificationFrames, 141 int sessionId) 142 : mStatus(NO_INIT), 143 mIsTimed(false), 144 mPreviousPriority(ANDROID_PRIORITY_NORMAL), 145 mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT) 146{ 147 mStatus = set(streamType, sampleRate, format, channelMask, 148 0 /*frameCount*/, flags, cbf, user, notificationFrames, 149 sharedBuffer, false /*threadCanCallJava*/, sessionId); 150} 151 152AudioTrack::~AudioTrack() 153{ 154 ALOGV_IF(mSharedBuffer != 0, "Destructor sharedBuffer: %p", mSharedBuffer->pointer()); 155 156 if (mStatus == NO_ERROR) { 157 // Make sure that callback function exits in the case where 158 // it is looping on buffer full condition in obtainBuffer(). 159 // Otherwise the callback thread will never exit. 160 stop(); 161 if (mAudioTrackThread != 0) { 162 mAudioTrackThread->requestExitAndWait(); 163 mAudioTrackThread.clear(); 164 } 165 mAudioTrack.clear(); 166 IPCThreadState::self()->flushCommands(); 167 AudioSystem::releaseAudioSessionId(mSessionId); 168 } 169} 170 171status_t AudioTrack::set( 172 audio_stream_type_t streamType, 173 uint32_t sampleRate, 174 audio_format_t format, 175 int channelMask, 176 int frameCount, 177 audio_policy_output_flags_t flags, 178 callback_t cbf, 179 void* user, 180 int notificationFrames, 181 const sp<IMemory>& sharedBuffer, 182 bool threadCanCallJava, 183 int sessionId) 184{ 185 186 ALOGV_IF(sharedBuffer != 0, "sharedBuffer: %p, size: %d", sharedBuffer->pointer(), sharedBuffer->size()); 187 188 AutoMutex lock(mLock); 189 if (mAudioTrack != 0) { 190 ALOGE("Track already in use"); 191 return INVALID_OPERATION; 192 } 193 194 int afSampleRate; 195 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 196 return NO_INIT; 197 } 198 199 uint32_t afLatency; 200 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 201 return NO_INIT; 202 } 203 204 // handle default values first. 205 if (streamType == AUDIO_STREAM_DEFAULT) { 206 streamType = AUDIO_STREAM_MUSIC; 207 } 208 209 if (sampleRate == 0) { 210 sampleRate = afSampleRate; 211 } 212 213 // these below should probably come from the audioFlinger too... 214 if (format == AUDIO_FORMAT_DEFAULT) { 215 format = AUDIO_FORMAT_PCM_16_BIT; 216 } 217 if (channelMask == 0) { 218 channelMask = AUDIO_CHANNEL_OUT_STEREO; 219 } 220 221 // validate parameters 222 if (!audio_is_valid_format(format)) { 223 ALOGE("Invalid format"); 224 return BAD_VALUE; 225 } 226 227 // force direct flag if format is not linear PCM 228 if (!audio_is_linear_pcm(format)) { 229 flags = (audio_policy_output_flags_t) 230 ((flags | AUDIO_POLICY_OUTPUT_FLAG_DIRECT) & ~AUDIO_POLICY_OUTPUT_FLAG_FAST); 231 } 232 233 if (!audio_is_output_channel(channelMask)) { 234 ALOGE("Invalid channel mask"); 235 return BAD_VALUE; 236 } 237 uint32_t channelCount = popcount(channelMask); 238 239 audio_io_handle_t output = AudioSystem::getOutput( 240 streamType, 241 sampleRate, format, channelMask, 242 flags); 243 244 if (output == 0) { 245 ALOGE("Could not get audio output for stream type %d", streamType); 246 return BAD_VALUE; 247 } 248 249 mVolume[LEFT] = 1.0f; 250 mVolume[RIGHT] = 1.0f; 251 mSendLevel = 0.0f; 252 mFrameCount = frameCount; 253 mNotificationFramesReq = notificationFrames; 254 mSessionId = sessionId; 255 mAuxEffectId = 0; 256 mCbf = cbf; 257 258 // create the IAudioTrack 259 status_t status = createTrack_l(streamType, 260 sampleRate, 261 format, 262 (uint32_t)channelMask, 263 frameCount, 264 flags, 265 sharedBuffer, 266 output); 267 268 if (status != NO_ERROR) { 269 return status; 270 } 271 272 if (cbf != NULL) { 273 mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava); 274 } 275 276 mStatus = NO_ERROR; 277 278 mStreamType = streamType; 279 mFormat = format; 280 mChannelMask = (uint32_t)channelMask; 281 mChannelCount = channelCount; 282 mSharedBuffer = sharedBuffer; 283 mMuted = false; 284 mActive = false; 285 mUserData = user; 286 mLoopCount = 0; 287 mMarkerPosition = 0; 288 mMarkerReached = false; 289 mNewPosition = 0; 290 mUpdatePeriod = 0; 291 mFlushed = false; 292 mFlags = flags; 293 AudioSystem::acquireAudioSessionId(mSessionId); 294 mRestoreStatus = NO_ERROR; 295 return NO_ERROR; 296} 297 298status_t AudioTrack::initCheck() const 299{ 300 return mStatus; 301} 302 303// ------------------------------------------------------------------------- 304 305uint32_t AudioTrack::latency() const 306{ 307 return mLatency; 308} 309 310audio_stream_type_t AudioTrack::streamType() const 311{ 312 return mStreamType; 313} 314 315audio_format_t AudioTrack::format() const 316{ 317 return mFormat; 318} 319 320int AudioTrack::channelCount() const 321{ 322 return mChannelCount; 323} 324 325uint32_t AudioTrack::frameCount() const 326{ 327 return mCblk->frameCount; 328} 329 330size_t AudioTrack::frameSize() const 331{ 332 if (audio_is_linear_pcm(mFormat)) { 333 return channelCount()*audio_bytes_per_sample(mFormat); 334 } else { 335 return sizeof(uint8_t); 336 } 337} 338 339sp<IMemory>& AudioTrack::sharedBuffer() 340{ 341 return mSharedBuffer; 342} 343 344// ------------------------------------------------------------------------- 345 346void AudioTrack::start() 347{ 348 sp<AudioTrackThread> t = mAudioTrackThread; 349 status_t status = NO_ERROR; 350 351 ALOGV("start %p", this); 352 if (t != 0) { 353 if (t->exitPending()) { 354 if (t->requestExitAndWait() == WOULD_BLOCK) { 355 ALOGE("AudioTrack::start called from thread"); 356 return; 357 } 358 } 359 } 360 361 AutoMutex lock(mLock); 362 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 363 // while we are accessing the cblk 364 sp<IAudioTrack> audioTrack = mAudioTrack; 365 sp<IMemory> iMem = mCblkMemory; 366 audio_track_cblk_t* cblk = mCblk; 367 368 if (!mActive) { 369 mFlushed = false; 370 mActive = true; 371 mNewPosition = cblk->server + mUpdatePeriod; 372 cblk->lock.lock(); 373 cblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 374 cblk->waitTimeMs = 0; 375 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 376 pid_t tid; 377 if (t != 0) { 378 t->run("AudioTrack", ANDROID_PRIORITY_AUDIO); 379 tid = t->getTid(); // pid_t is unknown until run() 380 ALOGV("getTid=%d", tid); 381 if (tid == -1) { 382 tid = 0; 383 } 384 } else { 385 mPreviousPriority = getpriority(PRIO_PROCESS, 0); 386 mPreviousSchedulingGroup = androidGetThreadSchedulingGroup(0); 387 androidSetThreadPriority(0, ANDROID_PRIORITY_AUDIO); 388 tid = 0; // not gettid() 389 } 390 391 ALOGV("start %p before lock cblk %p", this, mCblk); 392 if (!(cblk->flags & CBLK_INVALID_MSK)) { 393 cblk->lock.unlock(); 394 ALOGV("mAudioTrack->start(tid=%d)", tid); 395 status = mAudioTrack->start(tid); 396 cblk->lock.lock(); 397 if (status == DEAD_OBJECT) { 398 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 399 } 400 } 401 if (cblk->flags & CBLK_INVALID_MSK) { 402 status = restoreTrack_l(cblk, true); 403 } 404 cblk->lock.unlock(); 405 if (status != NO_ERROR) { 406 ALOGV("start() failed"); 407 mActive = false; 408 if (t != 0) { 409 t->requestExit(); 410 } else { 411 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 412 androidSetThreadSchedulingGroup(0, mPreviousSchedulingGroup); 413 } 414 } 415 } 416 417} 418 419void AudioTrack::stop() 420{ 421 sp<AudioTrackThread> t = mAudioTrackThread; 422 423 ALOGV("stop %p", this); 424 425 AutoMutex lock(mLock); 426 if (mActive) { 427 mActive = false; 428 mCblk->cv.signal(); 429 mAudioTrack->stop(); 430 // Cancel loops (If we are in the middle of a loop, playback 431 // would not stop until loopCount reaches 0). 432 setLoop_l(0, 0, 0); 433 // the playback head position will reset to 0, so if a marker is set, we need 434 // to activate it again 435 mMarkerReached = false; 436 // Force flush if a shared buffer is used otherwise audioflinger 437 // will not stop before end of buffer is reached. 438 if (mSharedBuffer != 0) { 439 flush_l(); 440 } 441 if (t != 0) { 442 t->requestExit(); 443 } else { 444 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 445 androidSetThreadSchedulingGroup(0, mPreviousSchedulingGroup); 446 } 447 } 448 449} 450 451bool AudioTrack::stopped() const 452{ 453 AutoMutex lock(mLock); 454 return stopped_l(); 455} 456 457void AudioTrack::flush() 458{ 459 AutoMutex lock(mLock); 460 flush_l(); 461} 462 463// must be called with mLock held 464void AudioTrack::flush_l() 465{ 466 ALOGV("flush"); 467 468 // clear playback marker and periodic update counter 469 mMarkerPosition = 0; 470 mMarkerReached = false; 471 mUpdatePeriod = 0; 472 473 if (!mActive) { 474 mFlushed = true; 475 mAudioTrack->flush(); 476 // Release AudioTrack callback thread in case it was waiting for new buffers 477 // in AudioTrack::obtainBuffer() 478 mCblk->cv.signal(); 479 } 480} 481 482void AudioTrack::pause() 483{ 484 ALOGV("pause"); 485 AutoMutex lock(mLock); 486 if (mActive) { 487 mActive = false; 488 mAudioTrack->pause(); 489 } 490} 491 492void AudioTrack::mute(bool e) 493{ 494 mAudioTrack->mute(e); 495 mMuted = e; 496} 497 498bool AudioTrack::muted() const 499{ 500 return mMuted; 501} 502 503status_t AudioTrack::setVolume(float left, float right) 504{ 505 if (left < 0.0f || left > 1.0f || right < 0.0f || right > 1.0f) { 506 return BAD_VALUE; 507 } 508 509 AutoMutex lock(mLock); 510 mVolume[LEFT] = left; 511 mVolume[RIGHT] = right; 512 513 mCblk->setVolumeLR((uint32_t(uint16_t(right * 0x1000)) << 16) | uint16_t(left * 0x1000)); 514 515 return NO_ERROR; 516} 517 518void AudioTrack::getVolume(float* left, float* right) const 519{ 520 if (left != NULL) { 521 *left = mVolume[LEFT]; 522 } 523 if (right != NULL) { 524 *right = mVolume[RIGHT]; 525 } 526} 527 528status_t AudioTrack::setAuxEffectSendLevel(float level) 529{ 530 ALOGV("setAuxEffectSendLevel(%f)", level); 531 if (level < 0.0f || level > 1.0f) { 532 return BAD_VALUE; 533 } 534 AutoMutex lock(mLock); 535 536 mSendLevel = level; 537 538 mCblk->setSendLevel(level); 539 540 return NO_ERROR; 541} 542 543void AudioTrack::getAuxEffectSendLevel(float* level) const 544{ 545 if (level != NULL) { 546 *level = mSendLevel; 547 } 548} 549 550status_t AudioTrack::setSampleRate(int rate) 551{ 552 int afSamplingRate; 553 554 if (mIsTimed) { 555 return INVALID_OPERATION; 556 } 557 558 if (AudioSystem::getOutputSamplingRate(&afSamplingRate, mStreamType) != NO_ERROR) { 559 return NO_INIT; 560 } 561 // Resampler implementation limits input sampling rate to 2 x output sampling rate. 562 if (rate <= 0 || rate > afSamplingRate*2 ) return BAD_VALUE; 563 564 AutoMutex lock(mLock); 565 mCblk->sampleRate = rate; 566 return NO_ERROR; 567} 568 569uint32_t AudioTrack::getSampleRate() const 570{ 571 if (mIsTimed) { 572 return INVALID_OPERATION; 573 } 574 575 AutoMutex lock(mLock); 576 return mCblk->sampleRate; 577} 578 579status_t AudioTrack::setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount) 580{ 581 AutoMutex lock(mLock); 582 return setLoop_l(loopStart, loopEnd, loopCount); 583} 584 585// must be called with mLock held 586status_t AudioTrack::setLoop_l(uint32_t loopStart, uint32_t loopEnd, int loopCount) 587{ 588 audio_track_cblk_t* cblk = mCblk; 589 590 Mutex::Autolock _l(cblk->lock); 591 592 if (loopCount == 0) { 593 cblk->loopStart = UINT_MAX; 594 cblk->loopEnd = UINT_MAX; 595 cblk->loopCount = 0; 596 mLoopCount = 0; 597 return NO_ERROR; 598 } 599 600 if (mIsTimed) { 601 return INVALID_OPERATION; 602 } 603 604 if (loopStart >= loopEnd || 605 loopEnd - loopStart > cblk->frameCount || 606 cblk->server > loopStart) { 607 ALOGE("setLoop invalid value: loopStart %d, loopEnd %d, loopCount %d, framecount %d, user %d", loopStart, loopEnd, loopCount, cblk->frameCount, cblk->user); 608 return BAD_VALUE; 609 } 610 611 if ((mSharedBuffer != 0) && (loopEnd > cblk->frameCount)) { 612 ALOGE("setLoop invalid value: loop markers beyond data: loopStart %d, loopEnd %d, framecount %d", 613 loopStart, loopEnd, cblk->frameCount); 614 return BAD_VALUE; 615 } 616 617 cblk->loopStart = loopStart; 618 cblk->loopEnd = loopEnd; 619 cblk->loopCount = loopCount; 620 mLoopCount = loopCount; 621 622 return NO_ERROR; 623} 624 625status_t AudioTrack::setMarkerPosition(uint32_t marker) 626{ 627 if (mCbf == NULL) return INVALID_OPERATION; 628 629 mMarkerPosition = marker; 630 mMarkerReached = false; 631 632 return NO_ERROR; 633} 634 635status_t AudioTrack::getMarkerPosition(uint32_t *marker) const 636{ 637 if (marker == NULL) return BAD_VALUE; 638 639 *marker = mMarkerPosition; 640 641 return NO_ERROR; 642} 643 644status_t AudioTrack::setPositionUpdatePeriod(uint32_t updatePeriod) 645{ 646 if (mCbf == NULL) return INVALID_OPERATION; 647 648 uint32_t curPosition; 649 getPosition(&curPosition); 650 mNewPosition = curPosition + updatePeriod; 651 mUpdatePeriod = updatePeriod; 652 653 return NO_ERROR; 654} 655 656status_t AudioTrack::getPositionUpdatePeriod(uint32_t *updatePeriod) const 657{ 658 if (updatePeriod == NULL) return BAD_VALUE; 659 660 *updatePeriod = mUpdatePeriod; 661 662 return NO_ERROR; 663} 664 665status_t AudioTrack::setPosition(uint32_t position) 666{ 667 if (mIsTimed) return INVALID_OPERATION; 668 669 AutoMutex lock(mLock); 670 671 if (!stopped_l()) return INVALID_OPERATION; 672 673 Mutex::Autolock _l(mCblk->lock); 674 675 if (position > mCblk->user) return BAD_VALUE; 676 677 mCblk->server = position; 678 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 679 680 return NO_ERROR; 681} 682 683status_t AudioTrack::getPosition(uint32_t *position) 684{ 685 if (position == NULL) return BAD_VALUE; 686 AutoMutex lock(mLock); 687 *position = mFlushed ? 0 : mCblk->server; 688 689 return NO_ERROR; 690} 691 692status_t AudioTrack::reload() 693{ 694 AutoMutex lock(mLock); 695 696 if (!stopped_l()) return INVALID_OPERATION; 697 698 flush_l(); 699 700 mCblk->stepUser(mCblk->frameCount); 701 702 return NO_ERROR; 703} 704 705audio_io_handle_t AudioTrack::getOutput() 706{ 707 AutoMutex lock(mLock); 708 return getOutput_l(); 709} 710 711// must be called with mLock held 712audio_io_handle_t AudioTrack::getOutput_l() 713{ 714 return AudioSystem::getOutput(mStreamType, 715 mCblk->sampleRate, mFormat, mChannelMask, mFlags); 716} 717 718int AudioTrack::getSessionId() const 719{ 720 return mSessionId; 721} 722 723status_t AudioTrack::attachAuxEffect(int effectId) 724{ 725 ALOGV("attachAuxEffect(%d)", effectId); 726 status_t status = mAudioTrack->attachAuxEffect(effectId); 727 if (status == NO_ERROR) { 728 mAuxEffectId = effectId; 729 } 730 return status; 731} 732 733// ------------------------------------------------------------------------- 734 735// must be called with mLock held 736status_t AudioTrack::createTrack_l( 737 audio_stream_type_t streamType, 738 uint32_t sampleRate, 739 audio_format_t format, 740 uint32_t channelMask, 741 int frameCount, 742 audio_policy_output_flags_t flags, 743 const sp<IMemory>& sharedBuffer, 744 audio_io_handle_t output) 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 // Client decides whether the track is TIMED (see below), but can only express a preference 767 // for FAST. Server will perform additional tests. 768 if ((flags & AUDIO_POLICY_OUTPUT_FLAG_FAST) && !( 769 // either of these use cases: 770 // use case 1: shared buffer 771 (sharedBuffer != 0) || 772 // use case 2: callback handler 773 (mCbf != NULL))) { 774 ALOGW("AUDIO_POLICY_OUTPUT_FLAG_FAST denied"); 775 flags = (audio_policy_output_flags_t) (flags & ~AUDIO_POLICY_OUTPUT_FLAG_FAST); 776 } 777 778 mNotificationFramesAct = mNotificationFramesReq; 779 if (!audio_is_linear_pcm(format)) { 780 if (sharedBuffer != 0) { 781 frameCount = sharedBuffer->size(); 782 } 783 } else { 784 // Ensure that buffer depth covers at least audio hardware latency 785 uint32_t minBufCount = afLatency / ((1000 * afFrameCount)/afSampleRate); 786 if (minBufCount < 2) minBufCount = 2; 787 788 int minFrameCount = (afFrameCount*sampleRate*minBufCount)/afSampleRate; 789 790 if (sharedBuffer == 0) { 791 if (frameCount == 0) { 792 frameCount = minFrameCount; 793 } 794 if (mNotificationFramesAct == 0) { 795 mNotificationFramesAct = frameCount/2; 796 } 797 // Make sure that application is notified with sufficient margin 798 // before underrun 799 if (mNotificationFramesAct > (uint32_t)frameCount/2) { 800 mNotificationFramesAct = frameCount/2; 801 } 802 if (frameCount < minFrameCount && !(flags & AUDIO_POLICY_OUTPUT_FLAG_FAST)) { 803 // not ALOGW because it happens all the time when playing key clicks over A2DP 804 ALOGV("Minimum buffer size corrected from %d to %d", 805 frameCount, minFrameCount); 806 frameCount = minFrameCount; 807 } 808 } else { 809 // Ensure that buffer alignment matches channelCount 810 int channelCount = popcount(channelMask); 811 if (((uint32_t)sharedBuffer->pointer() & (channelCount | 1)) != 0) { 812 ALOGE("Invalid buffer alignement: address %p, channelCount %d", sharedBuffer->pointer(), channelCount); 813 return BAD_VALUE; 814 } 815 frameCount = sharedBuffer->size()/channelCount/sizeof(int16_t); 816 } 817 } 818 819 IAudioFlinger::track_flags_t trackFlags = IAudioFlinger::TRACK_DEFAULT; 820 if (mIsTimed) { 821 trackFlags |= IAudioFlinger::TRACK_TIMED; 822 } 823 if (flags & AUDIO_POLICY_OUTPUT_FLAG_FAST) { 824 trackFlags |= IAudioFlinger::TRACK_FAST; 825 } 826 827 sp<IAudioTrack> track = audioFlinger->createTrack(getpid(), 828 streamType, 829 sampleRate, 830 format, 831 channelMask, 832 frameCount, 833 trackFlags, 834 sharedBuffer, 835 output, 836 &mSessionId, 837 &status); 838 839 if (track == 0) { 840 ALOGE("AudioFlinger could not create track, status: %d", status); 841 return status; 842 } 843 sp<IMemory> cblk = track->getCblk(); 844 if (cblk == 0) { 845 ALOGE("Could not get control block"); 846 return NO_INIT; 847 } 848 mAudioTrack = track; 849 mCblkMemory = cblk; 850 mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer()); 851 android_atomic_or(CBLK_DIRECTION_OUT, &mCblk->flags); 852 if (sharedBuffer == 0) { 853 mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t); 854 } else { 855 mCblk->buffers = sharedBuffer->pointer(); 856 // Force buffer full condition as data is already present in shared memory 857 mCblk->stepUser(mCblk->frameCount); 858 } 859 860 mCblk->setVolumeLR((uint32_t(uint16_t(mVolume[RIGHT] * 0x1000)) << 16) | uint16_t(mVolume[LEFT] * 0x1000)); 861 mCblk->setSendLevel(mSendLevel); 862 mAudioTrack->attachAuxEffect(mAuxEffectId); 863 mCblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 864 mCblk->waitTimeMs = 0; 865 mRemainingFrames = mNotificationFramesAct; 866 mLatency = afLatency + (1000*mCblk->frameCount) / sampleRate; 867 return NO_ERROR; 868} 869 870status_t AudioTrack::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 871{ 872 AutoMutex lock(mLock); 873 bool active; 874 status_t result = NO_ERROR; 875 audio_track_cblk_t* cblk = mCblk; 876 uint32_t framesReq = audioBuffer->frameCount; 877 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 878 879 audioBuffer->frameCount = 0; 880 audioBuffer->size = 0; 881 882 uint32_t framesAvail = cblk->framesAvailable(); 883 884 cblk->lock.lock(); 885 if (cblk->flags & CBLK_INVALID_MSK) { 886 goto create_new_track; 887 } 888 cblk->lock.unlock(); 889 890 if (framesAvail == 0) { 891 cblk->lock.lock(); 892 goto start_loop_here; 893 while (framesAvail == 0) { 894 active = mActive; 895 if (CC_UNLIKELY(!active)) { 896 ALOGV("Not active and NO_MORE_BUFFERS"); 897 cblk->lock.unlock(); 898 return NO_MORE_BUFFERS; 899 } 900 if (CC_UNLIKELY(!waitCount)) { 901 cblk->lock.unlock(); 902 return WOULD_BLOCK; 903 } 904 if (!(cblk->flags & CBLK_INVALID_MSK)) { 905 mLock.unlock(); 906 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 907 cblk->lock.unlock(); 908 mLock.lock(); 909 if (!mActive) { 910 return status_t(STOPPED); 911 } 912 cblk->lock.lock(); 913 } 914 915 if (cblk->flags & CBLK_INVALID_MSK) { 916 goto create_new_track; 917 } 918 if (CC_UNLIKELY(result != NO_ERROR)) { 919 cblk->waitTimeMs += waitTimeMs; 920 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 921 // timing out when a loop has been set and we have already written upto loop end 922 // is a normal condition: no need to wake AudioFlinger up. 923 if (cblk->user < cblk->loopEnd) { 924 ALOGW( "obtainBuffer timed out (is the CPU pegged?) %p " 925 "user=%08x, server=%08x", this, cblk->user, cblk->server); 926 //unlock cblk mutex before calling mAudioTrack->start() (see issue #1617140) 927 cblk->lock.unlock(); 928 result = mAudioTrack->start(0); // callback thread hasn't changed 929 cblk->lock.lock(); 930 if (result == DEAD_OBJECT) { 931 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 932create_new_track: 933 result = restoreTrack_l(cblk, false); 934 } 935 if (result != NO_ERROR) { 936 ALOGW("obtainBuffer create Track error %d", result); 937 cblk->lock.unlock(); 938 return result; 939 } 940 } 941 cblk->waitTimeMs = 0; 942 } 943 944 if (--waitCount == 0) { 945 cblk->lock.unlock(); 946 return TIMED_OUT; 947 } 948 } 949 // read the server count again 950 start_loop_here: 951 framesAvail = cblk->framesAvailable_l(); 952 } 953 cblk->lock.unlock(); 954 } 955 956 // restart track if it was disabled by audioflinger due to previous underrun 957 if (mActive && (cblk->flags & CBLK_DISABLED_MSK)) { 958 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 959 ALOGW("obtainBuffer() track %p disabled, restarting", this); 960 mAudioTrack->start(0); // callback thread hasn't changed 961 } 962 963 cblk->waitTimeMs = 0; 964 965 if (framesReq > framesAvail) { 966 framesReq = framesAvail; 967 } 968 969 uint32_t u = cblk->user; 970 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 971 972 if (framesReq > bufferEnd - u) { 973 framesReq = bufferEnd - u; 974 } 975 976 audioBuffer->flags = mMuted ? Buffer::MUTE : 0; 977 audioBuffer->channelCount = mChannelCount; 978 audioBuffer->frameCount = framesReq; 979 audioBuffer->size = framesReq * cblk->frameSize; 980 if (audio_is_linear_pcm(mFormat)) { 981 audioBuffer->format = AUDIO_FORMAT_PCM_16_BIT; 982 } else { 983 audioBuffer->format = mFormat; 984 } 985 audioBuffer->raw = (int8_t *)cblk->buffer(u); 986 active = mActive; 987 return active ? status_t(NO_ERROR) : status_t(STOPPED); 988} 989 990void AudioTrack::releaseBuffer(Buffer* audioBuffer) 991{ 992 AutoMutex lock(mLock); 993 mCblk->stepUser(audioBuffer->frameCount); 994} 995 996// ------------------------------------------------------------------------- 997 998ssize_t AudioTrack::write(const void* buffer, size_t userSize) 999{ 1000 1001 if (mSharedBuffer != 0) return INVALID_OPERATION; 1002 if (mIsTimed) return INVALID_OPERATION; 1003 1004 if (ssize_t(userSize) < 0) { 1005 // Sanity-check: user is most-likely passing an error code, and it would 1006 // make the return value ambiguous (actualSize vs error). 1007 ALOGE("AudioTrack::write(buffer=%p, size=%u (%d)", 1008 buffer, userSize, userSize); 1009 return BAD_VALUE; 1010 } 1011 1012 ALOGV("write %p: %d bytes, mActive=%d", this, userSize, mActive); 1013 1014 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1015 // while we are accessing the cblk 1016 mLock.lock(); 1017 sp<IAudioTrack> audioTrack = mAudioTrack; 1018 sp<IMemory> iMem = mCblkMemory; 1019 mLock.unlock(); 1020 1021 ssize_t written = 0; 1022 const int8_t *src = (const int8_t *)buffer; 1023 Buffer audioBuffer; 1024 size_t frameSz = frameSize(); 1025 1026 do { 1027 audioBuffer.frameCount = userSize/frameSz; 1028 1029 status_t err = obtainBuffer(&audioBuffer, -1); 1030 if (err < 0) { 1031 // out of buffers, return #bytes written 1032 if (err == status_t(NO_MORE_BUFFERS)) 1033 break; 1034 return ssize_t(err); 1035 } 1036 1037 size_t toWrite; 1038 1039 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1040 // Divide capacity by 2 to take expansion into account 1041 toWrite = audioBuffer.size>>1; 1042 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) src, toWrite); 1043 } else { 1044 toWrite = audioBuffer.size; 1045 memcpy(audioBuffer.i8, src, toWrite); 1046 src += toWrite; 1047 } 1048 userSize -= toWrite; 1049 written += toWrite; 1050 1051 releaseBuffer(&audioBuffer); 1052 } while (userSize >= frameSz); 1053 1054 return written; 1055} 1056 1057// ------------------------------------------------------------------------- 1058 1059TimedAudioTrack::TimedAudioTrack() { 1060 mIsTimed = true; 1061} 1062 1063status_t TimedAudioTrack::allocateTimedBuffer(size_t size, sp<IMemory>* buffer) 1064{ 1065 status_t result = UNKNOWN_ERROR; 1066 1067 // If the track is not invalid already, try to allocate a buffer. alloc 1068 // fails indicating that the server is dead, flag the track as invalid so 1069 // we can attempt to restore in in just a bit. 1070 if (!(mCblk->flags & CBLK_INVALID_MSK)) { 1071 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1072 if (result == DEAD_OBJECT) { 1073 android_atomic_or(CBLK_INVALID_ON, &mCblk->flags); 1074 } 1075 } 1076 1077 // If the track is invalid at this point, attempt to restore it. and try the 1078 // allocation one more time. 1079 if (mCblk->flags & CBLK_INVALID_MSK) { 1080 mCblk->lock.lock(); 1081 result = restoreTrack_l(mCblk, false); 1082 mCblk->lock.unlock(); 1083 1084 if (result == OK) 1085 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1086 } 1087 1088 return result; 1089} 1090 1091status_t TimedAudioTrack::queueTimedBuffer(const sp<IMemory>& buffer, 1092 int64_t pts) 1093{ 1094 // restart track if it was disabled by audioflinger due to previous underrun 1095 if (mActive && (mCblk->flags & CBLK_DISABLED_MSK)) { 1096 android_atomic_and(~CBLK_DISABLED_ON, &mCblk->flags); 1097 ALOGW("queueTimedBuffer() track %p disabled, restarting", this); 1098 mAudioTrack->start(0); 1099 } 1100 1101 return mAudioTrack->queueTimedBuffer(buffer, pts); 1102} 1103 1104status_t TimedAudioTrack::setMediaTimeTransform(const LinearTransform& xform, 1105 TargetTimeline target) 1106{ 1107 return mAudioTrack->setMediaTimeTransform(xform, target); 1108} 1109 1110// ------------------------------------------------------------------------- 1111 1112bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 1113{ 1114 Buffer audioBuffer; 1115 uint32_t frames; 1116 size_t writtenSize; 1117 1118 mLock.lock(); 1119 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1120 // while we are accessing the cblk 1121 sp<IAudioTrack> audioTrack = mAudioTrack; 1122 sp<IMemory> iMem = mCblkMemory; 1123 audio_track_cblk_t* cblk = mCblk; 1124 bool active = mActive; 1125 mLock.unlock(); 1126 1127 // Manage underrun callback 1128 if (active && (cblk->framesAvailable() == cblk->frameCount)) { 1129 ALOGV("Underrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags); 1130 if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) { 1131 mCbf(EVENT_UNDERRUN, mUserData, 0); 1132 if (cblk->server == cblk->frameCount) { 1133 mCbf(EVENT_BUFFER_END, mUserData, 0); 1134 } 1135 if (mSharedBuffer != 0) return false; 1136 } 1137 } 1138 1139 // Manage loop end callback 1140 while (mLoopCount > cblk->loopCount) { 1141 int loopCount = -1; 1142 mLoopCount--; 1143 if (mLoopCount >= 0) loopCount = mLoopCount; 1144 1145 mCbf(EVENT_LOOP_END, mUserData, (void *)&loopCount); 1146 } 1147 1148 // Manage marker callback 1149 if (!mMarkerReached && (mMarkerPosition > 0)) { 1150 if (cblk->server >= mMarkerPosition) { 1151 mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition); 1152 mMarkerReached = true; 1153 } 1154 } 1155 1156 // Manage new position callback 1157 if (mUpdatePeriod > 0) { 1158 while (cblk->server >= mNewPosition) { 1159 mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition); 1160 mNewPosition += mUpdatePeriod; 1161 } 1162 } 1163 1164 // If Shared buffer is used, no data is requested from client. 1165 if (mSharedBuffer != 0) { 1166 frames = 0; 1167 } else { 1168 frames = mRemainingFrames; 1169 } 1170 1171 // See description of waitCount parameter at declaration of obtainBuffer(). 1172 // The logic below prevents us from being stuck below at obtainBuffer() 1173 // not being able to handle timed events (position, markers, loops). 1174 int32_t waitCount = -1; 1175 if (mUpdatePeriod || (!mMarkerReached && mMarkerPosition) || mLoopCount) { 1176 waitCount = 1; 1177 } 1178 1179 do { 1180 1181 audioBuffer.frameCount = frames; 1182 1183 status_t err = obtainBuffer(&audioBuffer, waitCount); 1184 if (err < NO_ERROR) { 1185 if (err != TIMED_OUT) { 1186 ALOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up."); 1187 return false; 1188 } 1189 break; 1190 } 1191 if (err == status_t(STOPPED)) return false; 1192 1193 // Divide buffer size by 2 to take into account the expansion 1194 // due to 8 to 16 bit conversion: the callback must fill only half 1195 // of the destination buffer 1196 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1197 audioBuffer.size >>= 1; 1198 } 1199 1200 size_t reqSize = audioBuffer.size; 1201 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 1202 writtenSize = audioBuffer.size; 1203 1204 // Sanity check on returned size 1205 if (ssize_t(writtenSize) <= 0) { 1206 // The callback is done filling buffers 1207 // Keep this thread going to handle timed events and 1208 // still try to get more data in intervals of WAIT_PERIOD_MS 1209 // but don't just loop and block the CPU, so wait 1210 usleep(WAIT_PERIOD_MS*1000); 1211 break; 1212 } 1213 if (writtenSize > reqSize) writtenSize = reqSize; 1214 1215 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT)) { 1216 // 8 to 16 bit conversion, note that source and destination are the same address 1217 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) audioBuffer.i8, writtenSize); 1218 writtenSize <<= 1; 1219 } 1220 1221 audioBuffer.size = writtenSize; 1222 // NOTE: mCblk->frameSize is not equal to AudioTrack::frameSize() for 1223 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of 1224 // 16 bit. 1225 audioBuffer.frameCount = writtenSize/mCblk->frameSize; 1226 1227 frames -= audioBuffer.frameCount; 1228 1229 releaseBuffer(&audioBuffer); 1230 } 1231 while (frames); 1232 1233 if (frames == 0) { 1234 mRemainingFrames = mNotificationFramesAct; 1235 } else { 1236 mRemainingFrames = frames; 1237 } 1238 return true; 1239} 1240 1241// must be called with mLock and cblk.lock held. Callers must also hold strong references on 1242// the IAudioTrack and IMemory in case they are recreated here. 1243// If the IAudioTrack is successfully restored, the cblk pointer is updated 1244status_t AudioTrack::restoreTrack_l(audio_track_cblk_t*& cblk, bool fromStart) 1245{ 1246 status_t result; 1247 1248 if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) { 1249 ALOGW("dead IAudioTrack, creating a new one from %s TID %d", 1250 fromStart ? "start()" : "obtainBuffer()", gettid()); 1251 1252 // signal old cblk condition so that other threads waiting for available buffers stop 1253 // waiting now 1254 cblk->cv.broadcast(); 1255 cblk->lock.unlock(); 1256 1257 // refresh the audio configuration cache in this process to make sure we get new 1258 // output parameters in getOutput_l() and createTrack_l() 1259 AudioSystem::clearAudioConfigCache(); 1260 1261 // if the new IAudioTrack is created, createTrack_l() will modify the 1262 // following member variables: mAudioTrack, mCblkMemory and mCblk. 1263 // It will also delete the strong references on previous IAudioTrack and IMemory 1264 result = createTrack_l(mStreamType, 1265 cblk->sampleRate, 1266 mFormat, 1267 mChannelMask, 1268 mFrameCount, 1269 mFlags, 1270 mSharedBuffer, 1271 getOutput_l()); 1272 1273 if (result == NO_ERROR) { 1274 uint32_t user = cblk->user; 1275 uint32_t server = cblk->server; 1276 // restore write index and set other indexes to reflect empty buffer status 1277 mCblk->user = user; 1278 mCblk->server = user; 1279 mCblk->userBase = user; 1280 mCblk->serverBase = user; 1281 // restore loop: this is not guaranteed to succeed if new frame count is not 1282 // compatible with loop length 1283 setLoop_l(cblk->loopStart, cblk->loopEnd, cblk->loopCount); 1284 if (!fromStart) { 1285 mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1286 // Make sure that a client relying on callback events indicating underrun or 1287 // the actual amount of audio frames played (e.g SoundPool) receives them. 1288 if (mSharedBuffer == 0) { 1289 uint32_t frames = 0; 1290 if (user > server) { 1291 frames = ((user - server) > mCblk->frameCount) ? 1292 mCblk->frameCount : (user - server); 1293 memset(mCblk->buffers, 0, frames * mCblk->frameSize); 1294 } 1295 // restart playback even if buffer is not completely filled. 1296 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 1297 // stepUser() clears CBLK_UNDERRUN_ON flag enabling underrun callbacks to 1298 // the client 1299 mCblk->stepUser(frames); 1300 } 1301 } 1302 if (mActive) { 1303 result = mAudioTrack->start(0); // callback thread hasn't changed 1304 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() start() failed status %d", result); 1305 } 1306 if (fromStart && result == NO_ERROR) { 1307 mNewPosition = mCblk->server + mUpdatePeriod; 1308 } 1309 } 1310 if (result != NO_ERROR) { 1311 android_atomic_and(~CBLK_RESTORING_ON, &cblk->flags); 1312 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() failed status %d", result); 1313 } 1314 mRestoreStatus = result; 1315 // signal old cblk condition for other threads waiting for restore completion 1316 android_atomic_or(CBLK_RESTORED_ON, &cblk->flags); 1317 cblk->cv.broadcast(); 1318 } else { 1319 if (!(cblk->flags & CBLK_RESTORED_MSK)) { 1320 ALOGW("dead IAudioTrack, waiting for a new one TID %d", gettid()); 1321 mLock.unlock(); 1322 result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS)); 1323 if (result == NO_ERROR) { 1324 result = mRestoreStatus; 1325 } 1326 cblk->lock.unlock(); 1327 mLock.lock(); 1328 } else { 1329 ALOGW("dead IAudioTrack, already restored TID %d", gettid()); 1330 result = mRestoreStatus; 1331 cblk->lock.unlock(); 1332 } 1333 } 1334 ALOGV("restoreTrack_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x", 1335 result, mActive, mCblk, cblk, mCblk->flags, cblk->flags); 1336 1337 if (result == NO_ERROR) { 1338 // from now on we switch to the newly created cblk 1339 cblk = mCblk; 1340 } 1341 cblk->lock.lock(); 1342 1343 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() error %d TID %d", result, gettid()); 1344 1345 return result; 1346} 1347 1348status_t AudioTrack::dump(int fd, const Vector<String16>& args) const 1349{ 1350 1351 const size_t SIZE = 256; 1352 char buffer[SIZE]; 1353 String8 result; 1354 1355 result.append(" AudioTrack::dump\n"); 1356 snprintf(buffer, 255, " stream type(%d), left - right volume(%f, %f)\n", mStreamType, mVolume[0], mVolume[1]); 1357 result.append(buffer); 1358 snprintf(buffer, 255, " format(%d), channel count(%d), frame count(%d)\n", mFormat, mChannelCount, mCblk->frameCount); 1359 result.append(buffer); 1360 snprintf(buffer, 255, " sample rate(%d), status(%d), muted(%d)\n", (mCblk == 0) ? 0 : mCblk->sampleRate, mStatus, mMuted); 1361 result.append(buffer); 1362 snprintf(buffer, 255, " active(%d), latency (%d)\n", mActive, mLatency); 1363 result.append(buffer); 1364 ::write(fd, result.string(), result.size()); 1365 return NO_ERROR; 1366} 1367 1368// ========================================================================= 1369 1370AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava) 1371 : Thread(bCanCallJava), mReceiver(receiver) 1372{ 1373} 1374 1375bool AudioTrack::AudioTrackThread::threadLoop() 1376{ 1377 return mReceiver.processAudioBuffer(this); 1378} 1379 1380status_t AudioTrack::AudioTrackThread::readyToRun() 1381{ 1382 return NO_ERROR; 1383} 1384 1385void AudioTrack::AudioTrackThread::onFirstRef() 1386{ 1387} 1388 1389// ========================================================================= 1390 1391 1392audio_track_cblk_t::audio_track_cblk_t() 1393 : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0), 1394 userBase(0), serverBase(0), buffers(NULL), frameCount(0), 1395 loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), mVolumeLR(0x10001000), 1396 mSendLevel(0), flags(0) 1397{ 1398} 1399 1400uint32_t audio_track_cblk_t::stepUser(uint32_t frameCount) 1401{ 1402 ALOGV("stepuser %08x %08x %d", user, server, frameCount); 1403 1404 uint32_t u = user; 1405 u += frameCount; 1406 // Ensure that user is never ahead of server for AudioRecord 1407 if (flags & CBLK_DIRECTION_MSK) { 1408 // If stepServer() has been called once, switch to normal obtainBuffer() timeout period 1409 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) { 1410 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1411 } 1412 } else if (u > server) { 1413 ALOGW("stepUser occurred after track reset"); 1414 u = server; 1415 } 1416 1417 uint32_t fc = this->frameCount; 1418 if (u >= fc) { 1419 // common case, user didn't just wrap 1420 if (u - fc >= userBase ) { 1421 userBase += fc; 1422 } 1423 } else if (u >= userBase + fc) { 1424 // user just wrapped 1425 userBase += fc; 1426 } 1427 1428 user = u; 1429 1430 // Clear flow control error condition as new data has been written/read to/from buffer. 1431 if (flags & CBLK_UNDERRUN_MSK) { 1432 android_atomic_and(~CBLK_UNDERRUN_MSK, &flags); 1433 } 1434 1435 return u; 1436} 1437 1438bool audio_track_cblk_t::stepServer(uint32_t frameCount) 1439{ 1440 ALOGV("stepserver %08x %08x %d", user, server, frameCount); 1441 1442 if (!tryLock()) { 1443 ALOGW("stepServer() could not lock cblk"); 1444 return false; 1445 } 1446 1447 uint32_t s = server; 1448 bool flushed = (s == user); 1449 1450 s += frameCount; 1451 if (flags & CBLK_DIRECTION_MSK) { 1452 // Mark that we have read the first buffer so that next time stepUser() is called 1453 // we switch to normal obtainBuffer() timeout period 1454 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) { 1455 bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1; 1456 } 1457 // It is possible that we receive a flush() 1458 // while the mixer is processing a block: in this case, 1459 // stepServer() is called After the flush() has reset u & s and 1460 // we have s > u 1461 if (flushed) { 1462 ALOGW("stepServer occurred after track reset"); 1463 s = user; 1464 } 1465 } 1466 1467 if (s >= loopEnd) { 1468 ALOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd); 1469 s = loopStart; 1470 if (--loopCount == 0) { 1471 loopEnd = UINT_MAX; 1472 loopStart = UINT_MAX; 1473 } 1474 } 1475 1476 uint32_t fc = this->frameCount; 1477 if (s >= fc) { 1478 // common case, server didn't just wrap 1479 if (s - fc >= serverBase ) { 1480 serverBase += fc; 1481 } 1482 } else if (s >= serverBase + fc) { 1483 // server just wrapped 1484 serverBase += fc; 1485 } 1486 1487 server = s; 1488 1489 if (!(flags & CBLK_INVALID_MSK)) { 1490 cv.signal(); 1491 } 1492 lock.unlock(); 1493 return true; 1494} 1495 1496void* audio_track_cblk_t::buffer(uint32_t offset) const 1497{ 1498 return (int8_t *)buffers + (offset - userBase) * frameSize; 1499} 1500 1501uint32_t audio_track_cblk_t::framesAvailable() 1502{ 1503 Mutex::Autolock _l(lock); 1504 return framesAvailable_l(); 1505} 1506 1507uint32_t audio_track_cblk_t::framesAvailable_l() 1508{ 1509 uint32_t u = user; 1510 uint32_t s = server; 1511 1512 if (flags & CBLK_DIRECTION_MSK) { 1513 uint32_t limit = (s < loopStart) ? s : loopStart; 1514 return limit + frameCount - u; 1515 } else { 1516 return frameCount + u - s; 1517 } 1518} 1519 1520uint32_t audio_track_cblk_t::framesReady() 1521{ 1522 uint32_t u = user; 1523 uint32_t s = server; 1524 1525 if (flags & CBLK_DIRECTION_MSK) { 1526 if (u < loopEnd) { 1527 return u - s; 1528 } else { 1529 // do not block on mutex shared with client on AudioFlinger side 1530 if (!tryLock()) { 1531 ALOGW("framesReady() could not lock cblk"); 1532 return 0; 1533 } 1534 uint32_t frames = UINT_MAX; 1535 if (loopCount >= 0) { 1536 frames = (loopEnd - loopStart)*loopCount + u - s; 1537 } 1538 lock.unlock(); 1539 return frames; 1540 } 1541 } else { 1542 return s - u; 1543 } 1544} 1545 1546bool audio_track_cblk_t::tryLock() 1547{ 1548 // the code below simulates lock-with-timeout 1549 // we MUST do this to protect the AudioFlinger server 1550 // as this lock is shared with the client. 1551 status_t err; 1552 1553 err = lock.tryLock(); 1554 if (err == -EBUSY) { // just wait a bit 1555 usleep(1000); 1556 err = lock.tryLock(); 1557 } 1558 if (err != NO_ERROR) { 1559 // probably, the client just died. 1560 return false; 1561 } 1562 return true; 1563} 1564 1565// ------------------------------------------------------------------------- 1566 1567}; // namespace android 1568