AudioTrack.cpp revision f4022f90db5acb680870db8c1150b673cdd211d9
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 // FIXME merge with similar code in createTrack_l(), except we're missing 58 // some information here that is available in createTrack_l(): 59 // audio_io_handle_t output 60 // audio_format_t format 61 // audio_channel_mask_t channelMask 62 // audio_output_flags_t flags 63 int afSampleRate; 64 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 65 return NO_INIT; 66 } 67 int afFrameCount; 68 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 69 return NO_INIT; 70 } 71 uint32_t afLatency; 72 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 73 return NO_INIT; 74 } 75 76 // Ensure that buffer depth covers at least audio hardware latency 77 uint32_t minBufCount = afLatency / ((1000 * afFrameCount) / afSampleRate); 78 if (minBufCount < 2) minBufCount = 2; 79 80 *frameCount = (sampleRate == 0) ? afFrameCount * minBufCount : 81 afFrameCount * minBufCount * sampleRate / afSampleRate; 82 ALOGV("getMinFrameCount=%d: afFrameCount=%d, minBufCount=%d, afSampleRate=%d, afLatency=%d", 83 *frameCount, afFrameCount, minBufCount, afSampleRate, afLatency); 84 return NO_ERROR; 85} 86 87// --------------------------------------------------------------------------- 88 89AudioTrack::AudioTrack() 90 : mStatus(NO_INIT), 91 mIsTimed(false), 92 mPreviousPriority(ANDROID_PRIORITY_NORMAL), 93 mPreviousSchedulingGroup(SP_DEFAULT) 94{ 95} 96 97AudioTrack::AudioTrack( 98 audio_stream_type_t streamType, 99 uint32_t sampleRate, 100 audio_format_t format, 101 int channelMask, 102 int frameCount, 103 audio_output_flags_t flags, 104 callback_t cbf, 105 void* user, 106 int notificationFrames, 107 int sessionId) 108 : mStatus(NO_INIT), 109 mIsTimed(false), 110 mPreviousPriority(ANDROID_PRIORITY_NORMAL), 111 mPreviousSchedulingGroup(SP_DEFAULT) 112{ 113 mStatus = set(streamType, sampleRate, format, channelMask, 114 frameCount, flags, cbf, user, notificationFrames, 115 0 /*sharedBuffer*/, false /*threadCanCallJava*/, sessionId); 116} 117 118// DEPRECATED 119AudioTrack::AudioTrack( 120 int streamType, 121 uint32_t sampleRate, 122 int format, 123 int channelMask, 124 int frameCount, 125 uint32_t flags, 126 callback_t cbf, 127 void* user, 128 int notificationFrames, 129 int sessionId) 130 : mStatus(NO_INIT), 131 mIsTimed(false), 132 mPreviousPriority(ANDROID_PRIORITY_NORMAL), mPreviousSchedulingGroup(SP_DEFAULT) 133{ 134 mStatus = set((audio_stream_type_t)streamType, sampleRate, (audio_format_t)format, channelMask, 135 frameCount, (audio_output_flags_t)flags, cbf, user, notificationFrames, 136 0 /*sharedBuffer*/, false /*threadCanCallJava*/, sessionId); 137} 138 139AudioTrack::AudioTrack( 140 audio_stream_type_t streamType, 141 uint32_t sampleRate, 142 audio_format_t format, 143 int channelMask, 144 const sp<IMemory>& sharedBuffer, 145 audio_output_flags_t flags, 146 callback_t cbf, 147 void* user, 148 int notificationFrames, 149 int sessionId) 150 : mStatus(NO_INIT), 151 mIsTimed(false), 152 mPreviousPriority(ANDROID_PRIORITY_NORMAL), 153 mPreviousSchedulingGroup(SP_DEFAULT) 154{ 155 mStatus = set(streamType, sampleRate, format, channelMask, 156 0 /*frameCount*/, flags, cbf, user, notificationFrames, 157 sharedBuffer, false /*threadCanCallJava*/, sessionId); 158} 159 160AudioTrack::~AudioTrack() 161{ 162 ALOGV_IF(mSharedBuffer != 0, "Destructor sharedBuffer: %p", mSharedBuffer->pointer()); 163 164 if (mStatus == NO_ERROR) { 165 // Make sure that callback function exits in the case where 166 // it is looping on buffer full condition in obtainBuffer(). 167 // Otherwise the callback thread will never exit. 168 stop(); 169 if (mAudioTrackThread != 0) { 170 mAudioTrackThread->requestExit(); // see comment in AudioTrack.h 171 mAudioTrackThread->requestExitAndWait(); 172 mAudioTrackThread.clear(); 173 } 174 mAudioTrack.clear(); 175 IPCThreadState::self()->flushCommands(); 176 AudioSystem::releaseAudioSessionId(mSessionId); 177 } 178} 179 180status_t AudioTrack::set( 181 audio_stream_type_t streamType, 182 uint32_t sampleRate, 183 audio_format_t format, 184 int channelMask, 185 int frameCount, 186 audio_output_flags_t flags, 187 callback_t cbf, 188 void* user, 189 int notificationFrames, 190 const sp<IMemory>& sharedBuffer, 191 bool threadCanCallJava, 192 int sessionId) 193{ 194 195 ALOGV_IF(sharedBuffer != 0, "sharedBuffer: %p, size: %d", sharedBuffer->pointer(), sharedBuffer->size()); 196 197 ALOGV("set() streamType %d frameCount %d flags %04x", streamType, frameCount, flags); 198 199 AutoMutex lock(mLock); 200 if (mAudioTrack != 0) { 201 ALOGE("Track already in use"); 202 return INVALID_OPERATION; 203 } 204 205 // handle default values first. 206 if (streamType == AUDIO_STREAM_DEFAULT) { 207 streamType = AUDIO_STREAM_MUSIC; 208 } 209 210 if (sampleRate == 0) { 211 int afSampleRate; 212 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 213 return NO_INIT; 214 } 215 sampleRate = afSampleRate; 216 } 217 218 // these below should probably come from the audioFlinger too... 219 if (format == AUDIO_FORMAT_DEFAULT) { 220 format = AUDIO_FORMAT_PCM_16_BIT; 221 } 222 if (channelMask == 0) { 223 channelMask = AUDIO_CHANNEL_OUT_STEREO; 224 } 225 226 // validate parameters 227 if (!audio_is_valid_format(format)) { 228 ALOGE("Invalid format"); 229 return BAD_VALUE; 230 } 231 232 // AudioFlinger does not currently support 8-bit data in shared memory 233 if (format == AUDIO_FORMAT_PCM_8_BIT && sharedBuffer != 0) { 234 ALOGE("8-bit data in shared memory is not supported"); 235 return BAD_VALUE; 236 } 237 238 // force direct flag if format is not linear PCM 239 if (!audio_is_linear_pcm(format)) { 240 flags = (audio_output_flags_t) 241 // FIXME why can't we allow direct AND fast? 242 ((flags | AUDIO_OUTPUT_FLAG_DIRECT) & ~AUDIO_OUTPUT_FLAG_FAST); 243 } 244 // only allow deep buffering for music stream type 245 if (streamType != AUDIO_STREAM_MUSIC) { 246 flags = (audio_output_flags_t)(flags &~AUDIO_OUTPUT_FLAG_DEEP_BUFFER); 247 } 248 249 if (!audio_is_output_channel(channelMask)) { 250 ALOGE("Invalid channel mask"); 251 return BAD_VALUE; 252 } 253 uint32_t channelCount = popcount(channelMask); 254 255 audio_io_handle_t output = AudioSystem::getOutput( 256 streamType, 257 sampleRate, format, channelMask, 258 flags); 259 260 if (output == 0) { 261 ALOGE("Could not get audio output for stream type %d", streamType); 262 return BAD_VALUE; 263 } 264 265 mVolume[LEFT] = 1.0f; 266 mVolume[RIGHT] = 1.0f; 267 mSendLevel = 0.0f; 268 mFrameCount = frameCount; 269 mNotificationFramesReq = notificationFrames; 270 mSessionId = sessionId; 271 mAuxEffectId = 0; 272 mCbf = cbf; 273 274 if (cbf != NULL) { 275 mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava); 276 mAudioTrackThread->run("AudioTrack", ANDROID_PRIORITY_AUDIO, 0 /*stack*/); 277 } 278 279 // create the IAudioTrack 280 status_t status = createTrack_l(streamType, 281 sampleRate, 282 format, 283 (uint32_t)channelMask, 284 frameCount, 285 flags, 286 sharedBuffer, 287 output); 288 289 if (status != NO_ERROR) { 290 if (mAudioTrackThread != 0) { 291 mAudioTrackThread->requestExit(); 292 mAudioTrackThread.clear(); 293 } 294 return status; 295 } 296 297 mStatus = NO_ERROR; 298 299 mStreamType = streamType; 300 mFormat = format; 301 mChannelMask = (uint32_t)channelMask; 302 mChannelCount = channelCount; 303 mSharedBuffer = sharedBuffer; 304 mMuted = false; 305 mActive = false; 306 mUserData = user; 307 mLoopCount = 0; 308 mMarkerPosition = 0; 309 mMarkerReached = false; 310 mNewPosition = 0; 311 mUpdatePeriod = 0; 312 mFlushed = false; 313 mFlags = flags; 314 AudioSystem::acquireAudioSessionId(mSessionId); 315 mRestoreStatus = NO_ERROR; 316 return NO_ERROR; 317} 318 319status_t AudioTrack::initCheck() const 320{ 321 return mStatus; 322} 323 324// ------------------------------------------------------------------------- 325 326uint32_t AudioTrack::latency() const 327{ 328 return mLatency; 329} 330 331audio_stream_type_t AudioTrack::streamType() const 332{ 333 return mStreamType; 334} 335 336audio_format_t AudioTrack::format() const 337{ 338 return mFormat; 339} 340 341int AudioTrack::channelCount() const 342{ 343 return mChannelCount; 344} 345 346uint32_t AudioTrack::frameCount() const 347{ 348 return mCblk->frameCount; 349} 350 351size_t AudioTrack::frameSize() const 352{ 353 if (audio_is_linear_pcm(mFormat)) { 354 return channelCount()*audio_bytes_per_sample(mFormat); 355 } else { 356 return sizeof(uint8_t); 357 } 358} 359 360sp<IMemory>& AudioTrack::sharedBuffer() 361{ 362 return mSharedBuffer; 363} 364 365// ------------------------------------------------------------------------- 366 367void AudioTrack::start() 368{ 369 sp<AudioTrackThread> t = mAudioTrackThread; 370 status_t status = NO_ERROR; 371 372 ALOGV("start %p", this); 373 374 AutoMutex lock(mLock); 375 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 376 // while we are accessing the cblk 377 sp<IAudioTrack> audioTrack = mAudioTrack; 378 sp<IMemory> iMem = mCblkMemory; 379 audio_track_cblk_t* cblk = mCblk; 380 381 if (!mActive) { 382 mFlushed = false; 383 mActive = true; 384 mNewPosition = cblk->server + mUpdatePeriod; 385 cblk->lock.lock(); 386 cblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 387 cblk->waitTimeMs = 0; 388 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 389 if (t != 0) { 390 t->resume(); 391 } else { 392 mPreviousPriority = getpriority(PRIO_PROCESS, 0); 393 get_sched_policy(0, &mPreviousSchedulingGroup); 394 androidSetThreadPriority(0, ANDROID_PRIORITY_AUDIO); 395 } 396 397 ALOGV("start %p before lock cblk %p", this, mCblk); 398 if (!(cblk->flags & CBLK_INVALID_MSK)) { 399 cblk->lock.unlock(); 400 ALOGV("mAudioTrack->start()"); 401 status = mAudioTrack->start(); 402 cblk->lock.lock(); 403 if (status == DEAD_OBJECT) { 404 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 405 } 406 } 407 if (cblk->flags & CBLK_INVALID_MSK) { 408 status = restoreTrack_l(cblk, true); 409 } 410 cblk->lock.unlock(); 411 if (status != NO_ERROR) { 412 ALOGV("start() failed"); 413 mActive = false; 414 if (t != 0) { 415 t->pause(); 416 } else { 417 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 418 set_sched_policy(0, mPreviousSchedulingGroup); 419 } 420 } 421 } 422 423} 424 425void AudioTrack::stop() 426{ 427 sp<AudioTrackThread> t = mAudioTrackThread; 428 429 ALOGV("stop %p", this); 430 431 AutoMutex lock(mLock); 432 if (mActive) { 433 mActive = false; 434 mCblk->cv.signal(); 435 mAudioTrack->stop(); 436 // Cancel loops (If we are in the middle of a loop, playback 437 // would not stop until loopCount reaches 0). 438 setLoop_l(0, 0, 0); 439 // the playback head position will reset to 0, so if a marker is set, we need 440 // to activate it again 441 mMarkerReached = false; 442 // Force flush if a shared buffer is used otherwise audioflinger 443 // will not stop before end of buffer is reached. 444 if (mSharedBuffer != 0) { 445 flush_l(); 446 } 447 if (t != 0) { 448 t->pause(); 449 } else { 450 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 451 set_sched_policy(0, mPreviousSchedulingGroup); 452 } 453 } 454 455} 456 457bool AudioTrack::stopped() const 458{ 459 AutoMutex lock(mLock); 460 return stopped_l(); 461} 462 463void AudioTrack::flush() 464{ 465 AutoMutex lock(mLock); 466 flush_l(); 467} 468 469// must be called with mLock held 470void AudioTrack::flush_l() 471{ 472 ALOGV("flush"); 473 474 // clear playback marker and periodic update counter 475 mMarkerPosition = 0; 476 mMarkerReached = false; 477 mUpdatePeriod = 0; 478 479 if (!mActive) { 480 mFlushed = true; 481 mAudioTrack->flush(); 482 // Release AudioTrack callback thread in case it was waiting for new buffers 483 // in AudioTrack::obtainBuffer() 484 mCblk->cv.signal(); 485 } 486} 487 488void AudioTrack::pause() 489{ 490 ALOGV("pause"); 491 AutoMutex lock(mLock); 492 if (mActive) { 493 mActive = false; 494 mAudioTrack->pause(); 495 } 496} 497 498void AudioTrack::mute(bool e) 499{ 500 mAudioTrack->mute(e); 501 mMuted = e; 502} 503 504bool AudioTrack::muted() const 505{ 506 return mMuted; 507} 508 509status_t AudioTrack::setVolume(float left, float right) 510{ 511 if (left < 0.0f || left > 1.0f || right < 0.0f || right > 1.0f) { 512 return BAD_VALUE; 513 } 514 515 AutoMutex lock(mLock); 516 mVolume[LEFT] = left; 517 mVolume[RIGHT] = right; 518 519 mCblk->setVolumeLR((uint32_t(uint16_t(right * 0x1000)) << 16) | uint16_t(left * 0x1000)); 520 521 return NO_ERROR; 522} 523 524void AudioTrack::getVolume(float* left, float* right) const 525{ 526 if (left != NULL) { 527 *left = mVolume[LEFT]; 528 } 529 if (right != NULL) { 530 *right = mVolume[RIGHT]; 531 } 532} 533 534status_t AudioTrack::setAuxEffectSendLevel(float level) 535{ 536 ALOGV("setAuxEffectSendLevel(%f)", level); 537 if (level < 0.0f || level > 1.0f) { 538 return BAD_VALUE; 539 } 540 AutoMutex lock(mLock); 541 542 mSendLevel = level; 543 544 mCblk->setSendLevel(level); 545 546 return NO_ERROR; 547} 548 549void AudioTrack::getAuxEffectSendLevel(float* level) const 550{ 551 if (level != NULL) { 552 *level = mSendLevel; 553 } 554} 555 556status_t AudioTrack::setSampleRate(int rate) 557{ 558 int afSamplingRate; 559 560 if (mIsTimed) { 561 return INVALID_OPERATION; 562 } 563 564 if (AudioSystem::getOutputSamplingRate(&afSamplingRate, mStreamType) != NO_ERROR) { 565 return NO_INIT; 566 } 567 // Resampler implementation limits input sampling rate to 2 x output sampling rate. 568 if (rate <= 0 || rate > afSamplingRate*2 ) return BAD_VALUE; 569 570 AutoMutex lock(mLock); 571 mCblk->sampleRate = rate; 572 return NO_ERROR; 573} 574 575uint32_t AudioTrack::getSampleRate() const 576{ 577 if (mIsTimed) { 578 return INVALID_OPERATION; 579 } 580 581 AutoMutex lock(mLock); 582 return mCblk->sampleRate; 583} 584 585status_t AudioTrack::setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount) 586{ 587 AutoMutex lock(mLock); 588 return setLoop_l(loopStart, loopEnd, loopCount); 589} 590 591// must be called with mLock held 592status_t AudioTrack::setLoop_l(uint32_t loopStart, uint32_t loopEnd, int loopCount) 593{ 594 audio_track_cblk_t* cblk = mCblk; 595 596 Mutex::Autolock _l(cblk->lock); 597 598 if (loopCount == 0) { 599 cblk->loopStart = UINT_MAX; 600 cblk->loopEnd = UINT_MAX; 601 cblk->loopCount = 0; 602 mLoopCount = 0; 603 return NO_ERROR; 604 } 605 606 if (mIsTimed) { 607 return INVALID_OPERATION; 608 } 609 610 if (loopStart >= loopEnd || 611 loopEnd - loopStart > cblk->frameCount || 612 cblk->server > loopStart) { 613 ALOGE("setLoop invalid value: loopStart %d, loopEnd %d, loopCount %d, framecount %d, user %d", loopStart, loopEnd, loopCount, cblk->frameCount, cblk->user); 614 return BAD_VALUE; 615 } 616 617 if ((mSharedBuffer != 0) && (loopEnd > cblk->frameCount)) { 618 ALOGE("setLoop invalid value: loop markers beyond data: loopStart %d, loopEnd %d, framecount %d", 619 loopStart, loopEnd, cblk->frameCount); 620 return BAD_VALUE; 621 } 622 623 cblk->loopStart = loopStart; 624 cblk->loopEnd = loopEnd; 625 cblk->loopCount = loopCount; 626 mLoopCount = loopCount; 627 628 return NO_ERROR; 629} 630 631status_t AudioTrack::setMarkerPosition(uint32_t marker) 632{ 633 if (mCbf == NULL) return INVALID_OPERATION; 634 635 mMarkerPosition = marker; 636 mMarkerReached = false; 637 638 return NO_ERROR; 639} 640 641status_t AudioTrack::getMarkerPosition(uint32_t *marker) const 642{ 643 if (marker == NULL) return BAD_VALUE; 644 645 *marker = mMarkerPosition; 646 647 return NO_ERROR; 648} 649 650status_t AudioTrack::setPositionUpdatePeriod(uint32_t updatePeriod) 651{ 652 if (mCbf == NULL) return INVALID_OPERATION; 653 654 uint32_t curPosition; 655 getPosition(&curPosition); 656 mNewPosition = curPosition + updatePeriod; 657 mUpdatePeriod = updatePeriod; 658 659 return NO_ERROR; 660} 661 662status_t AudioTrack::getPositionUpdatePeriod(uint32_t *updatePeriod) const 663{ 664 if (updatePeriod == NULL) return BAD_VALUE; 665 666 *updatePeriod = mUpdatePeriod; 667 668 return NO_ERROR; 669} 670 671status_t AudioTrack::setPosition(uint32_t position) 672{ 673 if (mIsTimed) return INVALID_OPERATION; 674 675 AutoMutex lock(mLock); 676 677 if (!stopped_l()) return INVALID_OPERATION; 678 679 Mutex::Autolock _l(mCblk->lock); 680 681 if (position > mCblk->user) return BAD_VALUE; 682 683 mCblk->server = position; 684 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 685 686 return NO_ERROR; 687} 688 689status_t AudioTrack::getPosition(uint32_t *position) 690{ 691 if (position == NULL) return BAD_VALUE; 692 AutoMutex lock(mLock); 693 *position = mFlushed ? 0 : mCblk->server; 694 695 return NO_ERROR; 696} 697 698status_t AudioTrack::reload() 699{ 700 AutoMutex lock(mLock); 701 702 if (!stopped_l()) return INVALID_OPERATION; 703 704 flush_l(); 705 706 mCblk->stepUser(mCblk->frameCount); 707 708 return NO_ERROR; 709} 710 711audio_io_handle_t AudioTrack::getOutput() 712{ 713 AutoMutex lock(mLock); 714 return getOutput_l(); 715} 716 717// must be called with mLock held 718audio_io_handle_t AudioTrack::getOutput_l() 719{ 720 return AudioSystem::getOutput(mStreamType, 721 mCblk->sampleRate, mFormat, mChannelMask, mFlags); 722} 723 724int AudioTrack::getSessionId() const 725{ 726 return mSessionId; 727} 728 729status_t AudioTrack::attachAuxEffect(int effectId) 730{ 731 ALOGV("attachAuxEffect(%d)", effectId); 732 status_t status = mAudioTrack->attachAuxEffect(effectId); 733 if (status == NO_ERROR) { 734 mAuxEffectId = effectId; 735 } 736 return status; 737} 738 739// ------------------------------------------------------------------------- 740 741// must be called with mLock held 742status_t AudioTrack::createTrack_l( 743 audio_stream_type_t streamType, 744 uint32_t sampleRate, 745 audio_format_t format, 746 uint32_t channelMask, 747 int frameCount, 748 audio_output_flags_t flags, 749 const sp<IMemory>& sharedBuffer, 750 audio_io_handle_t output) 751{ 752 status_t status; 753 const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger(); 754 if (audioFlinger == 0) { 755 ALOGE("Could not get audioflinger"); 756 return NO_INIT; 757 } 758 759 uint32_t afLatency; 760 if (AudioSystem::getLatency(output, streamType, &afLatency) != NO_ERROR) { 761 return NO_INIT; 762 } 763 764 // Client decides whether the track is TIMED (see below), but can only express a preference 765 // for FAST. Server will perform additional tests. 766 if ((flags & AUDIO_OUTPUT_FLAG_FAST) && !( 767 // either of these use cases: 768 // use case 1: shared buffer 769 (sharedBuffer != 0) || 770 // use case 2: callback handler 771 (mCbf != NULL))) { 772 ALOGW("AUDIO_OUTPUT_FLAG_FAST denied by client"); 773 flags = (audio_output_flags_t) (flags & ~AUDIO_OUTPUT_FLAG_FAST); 774 } 775 ALOGV("createTrack_l() output %d afLatency %d", output, afLatency); 776 777 mNotificationFramesAct = mNotificationFramesReq; 778 779 if (!audio_is_linear_pcm(format)) { 780 781 if (sharedBuffer != 0) { 782 // Same comment as below about ignoring frameCount parameter for set() 783 frameCount = sharedBuffer->size(); 784 } else if (frameCount == 0) { 785 int afFrameCount; 786 if (AudioSystem::getFrameCount(output, streamType, &afFrameCount) != NO_ERROR) { 787 return NO_INIT; 788 } 789 frameCount = afFrameCount; 790 } 791 792 } else if (sharedBuffer != 0) { 793 794 // Ensure that buffer alignment matches channelCount 795 int channelCount = popcount(channelMask); 796 // 8-bit data in shared memory is not currently supported by AudioFlinger 797 size_t alignment = /* format == AUDIO_FORMAT_PCM_8_BIT ? 1 : */ 2; 798 if (channelCount > 1) { 799 // More than 2 channels does not require stronger alignment than stereo 800 alignment <<= 1; 801 } 802 if (((uint32_t)sharedBuffer->pointer() & (alignment - 1)) != 0) { 803 ALOGE("Invalid buffer alignment: address %p, channelCount %d", 804 sharedBuffer->pointer(), channelCount); 805 return BAD_VALUE; 806 } 807 808 // When initializing a shared buffer AudioTrack via constructors, 809 // there's no frameCount parameter. 810 // But when initializing a shared buffer AudioTrack via set(), 811 // there _is_ a frameCount parameter. We silently ignore it. 812 frameCount = sharedBuffer->size()/channelCount/sizeof(int16_t); 813 814 } else if (!(flags & AUDIO_OUTPUT_FLAG_FAST)) { 815 816 // FIXME move these calculations and associated checks to server 817 int afSampleRate; 818 if (AudioSystem::getSamplingRate(output, streamType, &afSampleRate) != NO_ERROR) { 819 return NO_INIT; 820 } 821 int afFrameCount; 822 if (AudioSystem::getFrameCount(output, streamType, &afFrameCount) != NO_ERROR) { 823 return NO_INIT; 824 } 825 826 // Ensure that buffer depth covers at least audio hardware latency 827 uint32_t minBufCount = afLatency / ((1000 * afFrameCount)/afSampleRate); 828 if (minBufCount < 2) minBufCount = 2; 829 830 int minFrameCount = (afFrameCount*sampleRate*minBufCount)/afSampleRate; 831 ALOGV("minFrameCount: %d, afFrameCount=%d, minBufCount=%d, sampleRate=%d, afSampleRate=%d" 832 ", afLatency=%d", 833 minFrameCount, afFrameCount, minBufCount, sampleRate, afSampleRate, afLatency); 834 835 if (frameCount == 0) { 836 frameCount = minFrameCount; 837 } 838 if (mNotificationFramesAct == 0) { 839 mNotificationFramesAct = frameCount/2; 840 } 841 // Make sure that application is notified with sufficient margin 842 // before underrun 843 if (mNotificationFramesAct > (uint32_t)frameCount/2) { 844 mNotificationFramesAct = frameCount/2; 845 } 846 if (frameCount < minFrameCount) { 847 // not ALOGW because it happens all the time when playing key clicks over A2DP 848 ALOGV("Minimum buffer size corrected from %d to %d", 849 frameCount, minFrameCount); 850 frameCount = minFrameCount; 851 } 852 853 } else { 854 // For fast tracks, the frame count calculations and checks are done by server 855 } 856 857 IAudioFlinger::track_flags_t trackFlags = IAudioFlinger::TRACK_DEFAULT; 858 if (mIsTimed) { 859 trackFlags |= IAudioFlinger::TRACK_TIMED; 860 } 861 862 pid_t tid = -1; 863 if (flags & AUDIO_OUTPUT_FLAG_FAST) { 864 trackFlags |= IAudioFlinger::TRACK_FAST; 865 if (mAudioTrackThread != 0) { 866 tid = mAudioTrackThread->getTid(); 867 } 868 } 869 870 sp<IAudioTrack> track = audioFlinger->createTrack(getpid(), 871 streamType, 872 sampleRate, 873 format, 874 channelMask, 875 frameCount, 876 trackFlags, 877 sharedBuffer, 878 output, 879 tid, 880 &mSessionId, 881 &status); 882 883 if (track == 0) { 884 ALOGE("AudioFlinger could not create track, status: %d", status); 885 return status; 886 } 887 sp<IMemory> cblk = track->getCblk(); 888 if (cblk == 0) { 889 ALOGE("Could not get control block"); 890 return NO_INIT; 891 } 892 mAudioTrack = track; 893 mCblkMemory = cblk; 894 mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer()); 895 // old has the previous value of mCblk->flags before the "or" operation 896 int32_t old = android_atomic_or(CBLK_DIRECTION_OUT, &mCblk->flags); 897 if (flags & AUDIO_OUTPUT_FLAG_FAST) { 898 if (old & CBLK_FAST) { 899 ALOGV("AUDIO_OUTPUT_FLAG_FAST successful; frameCount %u", mCblk->frameCount); 900 } else { 901 ALOGV("AUDIO_OUTPUT_FLAG_FAST denied by server; frameCount %u", mCblk->frameCount); 902 } 903 if (sharedBuffer == 0) { 904 mNotificationFramesAct = mCblk->frameCount/2; 905 } 906 } 907 if (sharedBuffer == 0) { 908 mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t); 909 } else { 910 mCblk->buffers = sharedBuffer->pointer(); 911 // Force buffer full condition as data is already present in shared memory 912 mCblk->stepUser(mCblk->frameCount); 913 } 914 915 mCblk->setVolumeLR((uint32_t(uint16_t(mVolume[RIGHT] * 0x1000)) << 16) | uint16_t(mVolume[LEFT] * 0x1000)); 916 mCblk->setSendLevel(mSendLevel); 917 mAudioTrack->attachAuxEffect(mAuxEffectId); 918 mCblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 919 mCblk->waitTimeMs = 0; 920 mRemainingFrames = mNotificationFramesAct; 921 // FIXME don't believe this lie 922 mLatency = afLatency + (1000*mCblk->frameCount) / sampleRate; 923 return NO_ERROR; 924} 925 926status_t AudioTrack::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 927{ 928 AutoMutex lock(mLock); 929 bool active; 930 status_t result = NO_ERROR; 931 audio_track_cblk_t* cblk = mCblk; 932 uint32_t framesReq = audioBuffer->frameCount; 933 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 934 935 audioBuffer->frameCount = 0; 936 audioBuffer->size = 0; 937 938 uint32_t framesAvail = cblk->framesAvailable(); 939 940 cblk->lock.lock(); 941 if (cblk->flags & CBLK_INVALID_MSK) { 942 goto create_new_track; 943 } 944 cblk->lock.unlock(); 945 946 if (framesAvail == 0) { 947 cblk->lock.lock(); 948 goto start_loop_here; 949 while (framesAvail == 0) { 950 active = mActive; 951 if (CC_UNLIKELY(!active)) { 952 ALOGV("Not active and NO_MORE_BUFFERS"); 953 cblk->lock.unlock(); 954 return NO_MORE_BUFFERS; 955 } 956 if (CC_UNLIKELY(!waitCount)) { 957 cblk->lock.unlock(); 958 return WOULD_BLOCK; 959 } 960 if (!(cblk->flags & CBLK_INVALID_MSK)) { 961 mLock.unlock(); 962 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 963 cblk->lock.unlock(); 964 mLock.lock(); 965 if (!mActive) { 966 return status_t(STOPPED); 967 } 968 cblk->lock.lock(); 969 } 970 971 if (cblk->flags & CBLK_INVALID_MSK) { 972 goto create_new_track; 973 } 974 if (CC_UNLIKELY(result != NO_ERROR)) { 975 cblk->waitTimeMs += waitTimeMs; 976 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 977 // timing out when a loop has been set and we have already written upto loop end 978 // is a normal condition: no need to wake AudioFlinger up. 979 if (cblk->user < cblk->loopEnd) { 980 ALOGW( "obtainBuffer timed out (is the CPU pegged?) %p " 981 "user=%08x, server=%08x", this, cblk->user, cblk->server); 982 //unlock cblk mutex before calling mAudioTrack->start() (see issue #1617140) 983 cblk->lock.unlock(); 984 result = mAudioTrack->start(); 985 cblk->lock.lock(); 986 if (result == DEAD_OBJECT) { 987 android_atomic_or(CBLK_INVALID_ON, &cblk->flags); 988create_new_track: 989 result = restoreTrack_l(cblk, false); 990 } 991 if (result != NO_ERROR) { 992 ALOGW("obtainBuffer create Track error %d", result); 993 cblk->lock.unlock(); 994 return result; 995 } 996 } 997 cblk->waitTimeMs = 0; 998 } 999 1000 if (--waitCount == 0) { 1001 cblk->lock.unlock(); 1002 return TIMED_OUT; 1003 } 1004 } 1005 // read the server count again 1006 start_loop_here: 1007 framesAvail = cblk->framesAvailable_l(); 1008 } 1009 cblk->lock.unlock(); 1010 } 1011 1012 // restart track if it was disabled by audioflinger due to previous underrun 1013 if (mActive && (cblk->flags & CBLK_DISABLED_MSK)) { 1014 android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags); 1015 ALOGW("obtainBuffer() track %p disabled, restarting", this); 1016 mAudioTrack->start(); 1017 } 1018 1019 cblk->waitTimeMs = 0; 1020 1021 if (framesReq > framesAvail) { 1022 framesReq = framesAvail; 1023 } 1024 1025 uint32_t u = cblk->user; 1026 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 1027 1028 if (framesReq > bufferEnd - u) { 1029 framesReq = bufferEnd - u; 1030 } 1031 1032 audioBuffer->flags = mMuted ? Buffer::MUTE : 0; 1033 audioBuffer->channelCount = mChannelCount; 1034 audioBuffer->frameCount = framesReq; 1035 audioBuffer->size = framesReq * cblk->frameSize; 1036 if (audio_is_linear_pcm(mFormat)) { 1037 audioBuffer->format = AUDIO_FORMAT_PCM_16_BIT; 1038 } else { 1039 audioBuffer->format = mFormat; 1040 } 1041 audioBuffer->raw = (int8_t *)cblk->buffer(u); 1042 active = mActive; 1043 return active ? status_t(NO_ERROR) : status_t(STOPPED); 1044} 1045 1046void AudioTrack::releaseBuffer(Buffer* audioBuffer) 1047{ 1048 AutoMutex lock(mLock); 1049 mCblk->stepUser(audioBuffer->frameCount); 1050} 1051 1052// ------------------------------------------------------------------------- 1053 1054ssize_t AudioTrack::write(const void* buffer, size_t userSize) 1055{ 1056 1057 if (mSharedBuffer != 0) return INVALID_OPERATION; 1058 if (mIsTimed) return INVALID_OPERATION; 1059 1060 if (ssize_t(userSize) < 0) { 1061 // Sanity-check: user is most-likely passing an error code, and it would 1062 // make the return value ambiguous (actualSize vs error). 1063 ALOGE("AudioTrack::write(buffer=%p, size=%u (%d)", 1064 buffer, userSize, userSize); 1065 return BAD_VALUE; 1066 } 1067 1068 ALOGV("write %p: %d bytes, mActive=%d", this, userSize, mActive); 1069 1070 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1071 // while we are accessing the cblk 1072 mLock.lock(); 1073 sp<IAudioTrack> audioTrack = mAudioTrack; 1074 sp<IMemory> iMem = mCblkMemory; 1075 mLock.unlock(); 1076 1077 ssize_t written = 0; 1078 const int8_t *src = (const int8_t *)buffer; 1079 Buffer audioBuffer; 1080 size_t frameSz = frameSize(); 1081 1082 do { 1083 audioBuffer.frameCount = userSize/frameSz; 1084 1085 status_t err = obtainBuffer(&audioBuffer, -1); 1086 if (err < 0) { 1087 // out of buffers, return #bytes written 1088 if (err == status_t(NO_MORE_BUFFERS)) 1089 break; 1090 return ssize_t(err); 1091 } 1092 1093 size_t toWrite; 1094 1095 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_OUTPUT_FLAG_DIRECT)) { 1096 // Divide capacity by 2 to take expansion into account 1097 toWrite = audioBuffer.size>>1; 1098 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) src, toWrite); 1099 } else { 1100 toWrite = audioBuffer.size; 1101 memcpy(audioBuffer.i8, src, toWrite); 1102 src += toWrite; 1103 } 1104 userSize -= toWrite; 1105 written += toWrite; 1106 1107 releaseBuffer(&audioBuffer); 1108 } while (userSize >= frameSz); 1109 1110 return written; 1111} 1112 1113// ------------------------------------------------------------------------- 1114 1115TimedAudioTrack::TimedAudioTrack() { 1116 mIsTimed = true; 1117} 1118 1119status_t TimedAudioTrack::allocateTimedBuffer(size_t size, sp<IMemory>* buffer) 1120{ 1121 status_t result = UNKNOWN_ERROR; 1122 1123 // If the track is not invalid already, try to allocate a buffer. alloc 1124 // fails indicating that the server is dead, flag the track as invalid so 1125 // we can attempt to restore in in just a bit. 1126 if (!(mCblk->flags & CBLK_INVALID_MSK)) { 1127 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1128 if (result == DEAD_OBJECT) { 1129 android_atomic_or(CBLK_INVALID_ON, &mCblk->flags); 1130 } 1131 } 1132 1133 // If the track is invalid at this point, attempt to restore it. and try the 1134 // allocation one more time. 1135 if (mCblk->flags & CBLK_INVALID_MSK) { 1136 mCblk->lock.lock(); 1137 result = restoreTrack_l(mCblk, false); 1138 mCblk->lock.unlock(); 1139 1140 if (result == OK) 1141 result = mAudioTrack->allocateTimedBuffer(size, buffer); 1142 } 1143 1144 return result; 1145} 1146 1147status_t TimedAudioTrack::queueTimedBuffer(const sp<IMemory>& buffer, 1148 int64_t pts) 1149{ 1150 // restart track if it was disabled by audioflinger due to previous underrun 1151 if (mActive && (mCblk->flags & CBLK_DISABLED_MSK)) { 1152 android_atomic_and(~CBLK_DISABLED_ON, &mCblk->flags); 1153 ALOGW("queueTimedBuffer() track %p disabled, restarting", this); 1154 mAudioTrack->start(); 1155 } 1156 1157 return mAudioTrack->queueTimedBuffer(buffer, pts); 1158} 1159 1160status_t TimedAudioTrack::setMediaTimeTransform(const LinearTransform& xform, 1161 TargetTimeline target) 1162{ 1163 return mAudioTrack->setMediaTimeTransform(xform, target); 1164} 1165 1166// ------------------------------------------------------------------------- 1167 1168bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 1169{ 1170 Buffer audioBuffer; 1171 uint32_t frames; 1172 size_t writtenSize; 1173 1174 mLock.lock(); 1175 // acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed 1176 // while we are accessing the cblk 1177 sp<IAudioTrack> audioTrack = mAudioTrack; 1178 sp<IMemory> iMem = mCblkMemory; 1179 audio_track_cblk_t* cblk = mCblk; 1180 bool active = mActive; 1181 mLock.unlock(); 1182 1183 // Manage underrun callback 1184 if (active && (cblk->framesAvailable() == cblk->frameCount)) { 1185 ALOGV("Underrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags); 1186 if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) { 1187 mCbf(EVENT_UNDERRUN, mUserData, 0); 1188 if (cblk->server == cblk->frameCount) { 1189 mCbf(EVENT_BUFFER_END, mUserData, 0); 1190 } 1191 if (mSharedBuffer != 0) return false; 1192 } 1193 } 1194 1195 // Manage loop end callback 1196 while (mLoopCount > cblk->loopCount) { 1197 int loopCount = -1; 1198 mLoopCount--; 1199 if (mLoopCount >= 0) loopCount = mLoopCount; 1200 1201 mCbf(EVENT_LOOP_END, mUserData, (void *)&loopCount); 1202 } 1203 1204 // Manage marker callback 1205 if (!mMarkerReached && (mMarkerPosition > 0)) { 1206 if (cblk->server >= mMarkerPosition) { 1207 mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition); 1208 mMarkerReached = true; 1209 } 1210 } 1211 1212 // Manage new position callback 1213 if (mUpdatePeriod > 0) { 1214 while (cblk->server >= mNewPosition) { 1215 mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition); 1216 mNewPosition += mUpdatePeriod; 1217 } 1218 } 1219 1220 // If Shared buffer is used, no data is requested from client. 1221 if (mSharedBuffer != 0) { 1222 frames = 0; 1223 } else { 1224 frames = mRemainingFrames; 1225 } 1226 1227 // See description of waitCount parameter at declaration of obtainBuffer(). 1228 // The logic below prevents us from being stuck below at obtainBuffer() 1229 // not being able to handle timed events (position, markers, loops). 1230 int32_t waitCount = -1; 1231 if (mUpdatePeriod || (!mMarkerReached && mMarkerPosition) || mLoopCount) { 1232 waitCount = 1; 1233 } 1234 1235 do { 1236 1237 audioBuffer.frameCount = frames; 1238 1239 status_t err = obtainBuffer(&audioBuffer, waitCount); 1240 if (err < NO_ERROR) { 1241 if (err != TIMED_OUT) { 1242 ALOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up."); 1243 return false; 1244 } 1245 break; 1246 } 1247 if (err == status_t(STOPPED)) return false; 1248 1249 // Divide buffer size by 2 to take into account the expansion 1250 // due to 8 to 16 bit conversion: the callback must fill only half 1251 // of the destination buffer 1252 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_OUTPUT_FLAG_DIRECT)) { 1253 audioBuffer.size >>= 1; 1254 } 1255 1256 size_t reqSize = audioBuffer.size; 1257 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 1258 writtenSize = audioBuffer.size; 1259 1260 // Sanity check on returned size 1261 if (ssize_t(writtenSize) <= 0) { 1262 // The callback is done filling buffers 1263 // Keep this thread going to handle timed events and 1264 // still try to get more data in intervals of WAIT_PERIOD_MS 1265 // but don't just loop and block the CPU, so wait 1266 usleep(WAIT_PERIOD_MS*1000); 1267 break; 1268 } 1269 if (writtenSize > reqSize) writtenSize = reqSize; 1270 1271 if (mFormat == AUDIO_FORMAT_PCM_8_BIT && !(mFlags & AUDIO_OUTPUT_FLAG_DIRECT)) { 1272 // 8 to 16 bit conversion, note that source and destination are the same address 1273 memcpy_to_i16_from_u8(audioBuffer.i16, (const uint8_t *) audioBuffer.i8, writtenSize); 1274 writtenSize <<= 1; 1275 } 1276 1277 audioBuffer.size = writtenSize; 1278 // NOTE: mCblk->frameSize is not equal to AudioTrack::frameSize() for 1279 // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of 1280 // 16 bit. 1281 audioBuffer.frameCount = writtenSize/mCblk->frameSize; 1282 1283 frames -= audioBuffer.frameCount; 1284 1285 releaseBuffer(&audioBuffer); 1286 } 1287 while (frames); 1288 1289 if (frames == 0) { 1290 mRemainingFrames = mNotificationFramesAct; 1291 } else { 1292 mRemainingFrames = frames; 1293 } 1294 return true; 1295} 1296 1297// must be called with mLock and cblk.lock held. Callers must also hold strong references on 1298// the IAudioTrack and IMemory in case they are recreated here. 1299// If the IAudioTrack is successfully restored, the cblk pointer is updated 1300status_t AudioTrack::restoreTrack_l(audio_track_cblk_t*& cblk, bool fromStart) 1301{ 1302 status_t result; 1303 1304 if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) { 1305 ALOGW("dead IAudioTrack, creating a new one from %s TID %d", 1306 fromStart ? "start()" : "obtainBuffer()", gettid()); 1307 1308 // signal old cblk condition so that other threads waiting for available buffers stop 1309 // waiting now 1310 cblk->cv.broadcast(); 1311 cblk->lock.unlock(); 1312 1313 // refresh the audio configuration cache in this process to make sure we get new 1314 // output parameters in getOutput_l() and createTrack_l() 1315 AudioSystem::clearAudioConfigCache(); 1316 1317 // if the new IAudioTrack is created, createTrack_l() will modify the 1318 // following member variables: mAudioTrack, mCblkMemory and mCblk. 1319 // It will also delete the strong references on previous IAudioTrack and IMemory 1320 result = createTrack_l(mStreamType, 1321 cblk->sampleRate, 1322 mFormat, 1323 mChannelMask, 1324 mFrameCount, 1325 mFlags, 1326 mSharedBuffer, 1327 getOutput_l()); 1328 1329 if (result == NO_ERROR) { 1330 uint32_t user = cblk->user; 1331 uint32_t server = cblk->server; 1332 // restore write index and set other indexes to reflect empty buffer status 1333 mCblk->user = user; 1334 mCblk->server = user; 1335 mCblk->userBase = user; 1336 mCblk->serverBase = user; 1337 // restore loop: this is not guaranteed to succeed if new frame count is not 1338 // compatible with loop length 1339 setLoop_l(cblk->loopStart, cblk->loopEnd, cblk->loopCount); 1340 if (!fromStart) { 1341 mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1342 // Make sure that a client relying on callback events indicating underrun or 1343 // the actual amount of audio frames played (e.g SoundPool) receives them. 1344 if (mSharedBuffer == 0) { 1345 uint32_t frames = 0; 1346 if (user > server) { 1347 frames = ((user - server) > mCblk->frameCount) ? 1348 mCblk->frameCount : (user - server); 1349 memset(mCblk->buffers, 0, frames * mCblk->frameSize); 1350 } 1351 // restart playback even if buffer is not completely filled. 1352 android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags); 1353 // stepUser() clears CBLK_UNDERRUN_ON flag enabling underrun callbacks to 1354 // the client 1355 mCblk->stepUser(frames); 1356 } 1357 } 1358 if (mActive) { 1359 result = mAudioTrack->start(); 1360 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() start() failed status %d", result); 1361 } 1362 if (fromStart && result == NO_ERROR) { 1363 mNewPosition = mCblk->server + mUpdatePeriod; 1364 } 1365 } 1366 if (result != NO_ERROR) { 1367 android_atomic_and(~CBLK_RESTORING_ON, &cblk->flags); 1368 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() failed status %d", result); 1369 } 1370 mRestoreStatus = result; 1371 // signal old cblk condition for other threads waiting for restore completion 1372 android_atomic_or(CBLK_RESTORED_ON, &cblk->flags); 1373 cblk->cv.broadcast(); 1374 } else { 1375 if (!(cblk->flags & CBLK_RESTORED_MSK)) { 1376 ALOGW("dead IAudioTrack, waiting for a new one TID %d", gettid()); 1377 mLock.unlock(); 1378 result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS)); 1379 if (result == NO_ERROR) { 1380 result = mRestoreStatus; 1381 } 1382 cblk->lock.unlock(); 1383 mLock.lock(); 1384 } else { 1385 ALOGW("dead IAudioTrack, already restored TID %d", gettid()); 1386 result = mRestoreStatus; 1387 cblk->lock.unlock(); 1388 } 1389 } 1390 ALOGV("restoreTrack_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x", 1391 result, mActive, mCblk, cblk, mCblk->flags, cblk->flags); 1392 1393 if (result == NO_ERROR) { 1394 // from now on we switch to the newly created cblk 1395 cblk = mCblk; 1396 } 1397 cblk->lock.lock(); 1398 1399 ALOGW_IF(result != NO_ERROR, "restoreTrack_l() error %d TID %d", result, gettid()); 1400 1401 return result; 1402} 1403 1404status_t AudioTrack::dump(int fd, const Vector<String16>& args) const 1405{ 1406 1407 const size_t SIZE = 256; 1408 char buffer[SIZE]; 1409 String8 result; 1410 1411 result.append(" AudioTrack::dump\n"); 1412 snprintf(buffer, 255, " stream type(%d), left - right volume(%f, %f)\n", mStreamType, mVolume[0], mVolume[1]); 1413 result.append(buffer); 1414 snprintf(buffer, 255, " format(%d), channel count(%d), frame count(%d)\n", mFormat, mChannelCount, mCblk->frameCount); 1415 result.append(buffer); 1416 snprintf(buffer, 255, " sample rate(%d), status(%d), muted(%d)\n", (mCblk == 0) ? 0 : mCblk->sampleRate, mStatus, mMuted); 1417 result.append(buffer); 1418 snprintf(buffer, 255, " active(%d), latency (%d)\n", mActive, mLatency); 1419 result.append(buffer); 1420 ::write(fd, result.string(), result.size()); 1421 return NO_ERROR; 1422} 1423 1424// ========================================================================= 1425 1426AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava) 1427 : Thread(bCanCallJava), mReceiver(receiver), mPaused(true) 1428{ 1429} 1430 1431AudioTrack::AudioTrackThread::~AudioTrackThread() 1432{ 1433} 1434 1435bool AudioTrack::AudioTrackThread::threadLoop() 1436{ 1437 { 1438 AutoMutex _l(mMyLock); 1439 if (mPaused) { 1440 mMyCond.wait(mMyLock); 1441 // caller will check for exitPending() 1442 return true; 1443 } 1444 } 1445 if (!mReceiver.processAudioBuffer(this)) { 1446 pause(); 1447 } 1448 return true; 1449} 1450 1451status_t AudioTrack::AudioTrackThread::readyToRun() 1452{ 1453 return NO_ERROR; 1454} 1455 1456void AudioTrack::AudioTrackThread::onFirstRef() 1457{ 1458} 1459 1460void AudioTrack::AudioTrackThread::requestExit() 1461{ 1462 // must be in this order to avoid a race condition 1463 Thread::requestExit(); 1464 resume(); 1465} 1466 1467void AudioTrack::AudioTrackThread::pause() 1468{ 1469 AutoMutex _l(mMyLock); 1470 mPaused = true; 1471} 1472 1473void AudioTrack::AudioTrackThread::resume() 1474{ 1475 AutoMutex _l(mMyLock); 1476 if (mPaused) { 1477 mPaused = false; 1478 mMyCond.signal(); 1479 } 1480} 1481 1482// ========================================================================= 1483 1484 1485audio_track_cblk_t::audio_track_cblk_t() 1486 : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0), 1487 userBase(0), serverBase(0), buffers(NULL), frameCount(0), 1488 loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), mVolumeLR(0x10001000), 1489 mSendLevel(0), flags(0) 1490{ 1491} 1492 1493uint32_t audio_track_cblk_t::stepUser(uint32_t frameCount) 1494{ 1495 ALOGV("stepuser %08x %08x %d", user, server, frameCount); 1496 1497 uint32_t u = user; 1498 u += frameCount; 1499 // Ensure that user is never ahead of server for AudioRecord 1500 if (flags & CBLK_DIRECTION_MSK) { 1501 // If stepServer() has been called once, switch to normal obtainBuffer() timeout period 1502 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) { 1503 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 1504 } 1505 } else if (u > server) { 1506 ALOGW("stepUser occurred after track reset"); 1507 u = server; 1508 } 1509 1510 uint32_t fc = this->frameCount; 1511 if (u >= fc) { 1512 // common case, user didn't just wrap 1513 if (u - fc >= userBase ) { 1514 userBase += fc; 1515 } 1516 } else if (u >= userBase + fc) { 1517 // user just wrapped 1518 userBase += fc; 1519 } 1520 1521 user = u; 1522 1523 // Clear flow control error condition as new data has been written/read to/from buffer. 1524 if (flags & CBLK_UNDERRUN_MSK) { 1525 android_atomic_and(~CBLK_UNDERRUN_MSK, &flags); 1526 } 1527 1528 return u; 1529} 1530 1531bool audio_track_cblk_t::stepServer(uint32_t frameCount) 1532{ 1533 ALOGV("stepserver %08x %08x %d", user, server, frameCount); 1534 1535 if (!tryLock()) { 1536 ALOGW("stepServer() could not lock cblk"); 1537 return false; 1538 } 1539 1540 uint32_t s = server; 1541 bool flushed = (s == user); 1542 1543 s += frameCount; 1544 if (flags & CBLK_DIRECTION_MSK) { 1545 // Mark that we have read the first buffer so that next time stepUser() is called 1546 // we switch to normal obtainBuffer() timeout period 1547 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) { 1548 bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1; 1549 } 1550 // It is possible that we receive a flush() 1551 // while the mixer is processing a block: in this case, 1552 // stepServer() is called After the flush() has reset u & s and 1553 // we have s > u 1554 if (flushed) { 1555 ALOGW("stepServer occurred after track reset"); 1556 s = user; 1557 } 1558 } 1559 1560 if (s >= loopEnd) { 1561 ALOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd); 1562 s = loopStart; 1563 if (--loopCount == 0) { 1564 loopEnd = UINT_MAX; 1565 loopStart = UINT_MAX; 1566 } 1567 } 1568 1569 uint32_t fc = this->frameCount; 1570 if (s >= fc) { 1571 // common case, server didn't just wrap 1572 if (s - fc >= serverBase ) { 1573 serverBase += fc; 1574 } 1575 } else if (s >= serverBase + fc) { 1576 // server just wrapped 1577 serverBase += fc; 1578 } 1579 1580 server = s; 1581 1582 if (!(flags & CBLK_INVALID_MSK)) { 1583 cv.signal(); 1584 } 1585 lock.unlock(); 1586 return true; 1587} 1588 1589void* audio_track_cblk_t::buffer(uint32_t offset) const 1590{ 1591 return (int8_t *)buffers + (offset - userBase) * frameSize; 1592} 1593 1594uint32_t audio_track_cblk_t::framesAvailable() 1595{ 1596 Mutex::Autolock _l(lock); 1597 return framesAvailable_l(); 1598} 1599 1600uint32_t audio_track_cblk_t::framesAvailable_l() 1601{ 1602 uint32_t u = user; 1603 uint32_t s = server; 1604 1605 if (flags & CBLK_DIRECTION_MSK) { 1606 uint32_t limit = (s < loopStart) ? s : loopStart; 1607 return limit + frameCount - u; 1608 } else { 1609 return frameCount + u - s; 1610 } 1611} 1612 1613uint32_t audio_track_cblk_t::framesReady() 1614{ 1615 uint32_t u = user; 1616 uint32_t s = server; 1617 1618 if (flags & CBLK_DIRECTION_MSK) { 1619 if (u < loopEnd) { 1620 return u - s; 1621 } else { 1622 // do not block on mutex shared with client on AudioFlinger side 1623 if (!tryLock()) { 1624 ALOGW("framesReady() could not lock cblk"); 1625 return 0; 1626 } 1627 uint32_t frames = UINT_MAX; 1628 if (loopCount >= 0) { 1629 frames = (loopEnd - loopStart)*loopCount + u - s; 1630 } 1631 lock.unlock(); 1632 return frames; 1633 } 1634 } else { 1635 return s - u; 1636 } 1637} 1638 1639bool audio_track_cblk_t::tryLock() 1640{ 1641 // the code below simulates lock-with-timeout 1642 // we MUST do this to protect the AudioFlinger server 1643 // as this lock is shared with the client. 1644 status_t err; 1645 1646 err = lock.tryLock(); 1647 if (err == -EBUSY) { // just wait a bit 1648 usleep(1000); 1649 err = lock.tryLock(); 1650 } 1651 if (err != NO_ERROR) { 1652 // probably, the client just died. 1653 return false; 1654 } 1655 return true; 1656} 1657 1658// ------------------------------------------------------------------------- 1659 1660}; // namespace android 1661