AudioTrack.cpp revision 349dba337e07e129f6ba49a132999f0b73fedbe3
1/* //device/extlibs/pv/android/AudioTrack.cpp 2** 3** Copyright 2007, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18 19//#define LOG_NDEBUG 0 20#define LOG_TAG "AudioTrack" 21 22#include <stdint.h> 23#include <sys/types.h> 24#include <limits.h> 25 26#include <sched.h> 27#include <sys/resource.h> 28 29#include <private/media/AudioTrackShared.h> 30 31#include <media/AudioSystem.h> 32#include <media/AudioTrack.h> 33 34#include <utils/Log.h> 35#include <binder/MemoryDealer.h> 36#include <binder/Parcel.h> 37#include <binder/IPCThreadState.h> 38#include <utils/Timers.h> 39#include <cutils/atomic.h> 40 41#define LIKELY( exp ) (__builtin_expect( (exp) != 0, true )) 42#define UNLIKELY( exp ) (__builtin_expect( (exp) != 0, false )) 43 44namespace android { 45 46// --------------------------------------------------------------------------- 47 48AudioTrack::AudioTrack() 49 : mStatus(NO_INIT) 50{ 51} 52 53AudioTrack::AudioTrack( 54 int streamType, 55 uint32_t sampleRate, 56 int format, 57 int channelCount, 58 int frameCount, 59 uint32_t flags, 60 callback_t cbf, 61 void* user, 62 int notificationFrames) 63 : mStatus(NO_INIT) 64{ 65 mStatus = set(streamType, sampleRate, format, channelCount, 66 frameCount, flags, cbf, user, notificationFrames, 0); 67} 68 69AudioTrack::AudioTrack( 70 int streamType, 71 uint32_t sampleRate, 72 int format, 73 int channelCount, 74 const sp<IMemory>& sharedBuffer, 75 uint32_t flags, 76 callback_t cbf, 77 void* user, 78 int notificationFrames) 79 : mStatus(NO_INIT) 80{ 81 mStatus = set(streamType, sampleRate, format, channelCount, 82 0, flags, cbf, user, notificationFrames, sharedBuffer); 83} 84 85AudioTrack::~AudioTrack() 86{ 87 LOGV_IF(mSharedBuffer != 0, "Destructor sharedBuffer: %p", mSharedBuffer->pointer()); 88 89 if (mStatus == NO_ERROR) { 90 // Make sure that callback function exits in the case where 91 // it is looping on buffer full condition in obtainBuffer(). 92 // Otherwise the callback thread will never exit. 93 stop(); 94 if (mAudioTrackThread != 0) { 95 mAudioTrackThread->requestExitAndWait(); 96 mAudioTrackThread.clear(); 97 } 98 mAudioTrack.clear(); 99 IPCThreadState::self()->flushCommands(); 100 } 101} 102 103status_t AudioTrack::set( 104 int streamType, 105 uint32_t sampleRate, 106 int format, 107 int channelCount, 108 int frameCount, 109 uint32_t flags, 110 callback_t cbf, 111 void* user, 112 int notificationFrames, 113 const sp<IMemory>& sharedBuffer, 114 bool threadCanCallJava) 115{ 116 117 LOGV_IF(sharedBuffer != 0, "sharedBuffer: %p, size: %d", sharedBuffer->pointer(), sharedBuffer->size()); 118 119 if (mAudioTrack != 0) { 120 LOGE("Track already in use"); 121 return INVALID_OPERATION; 122 } 123 124 const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger(); 125 if (audioFlinger == 0) { 126 LOGE("Could not get audioflinger"); 127 return NO_INIT; 128 } 129 int afSampleRate; 130 if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) { 131 return NO_INIT; 132 } 133 int afFrameCount; 134 if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) { 135 return NO_INIT; 136 } 137 uint32_t afLatency; 138 if (AudioSystem::getOutputLatency(&afLatency, streamType) != NO_ERROR) { 139 return NO_INIT; 140 } 141 142 // handle default values first. 143 if (streamType == AudioSystem::DEFAULT) { 144 streamType = AudioSystem::MUSIC; 145 } 146 if (sampleRate == 0) { 147 sampleRate = afSampleRate; 148 } 149 // these below should probably come from the audioFlinger too... 150 if (format == 0) { 151 format = AudioSystem::PCM_16_BIT; 152 } 153 if (channelCount == 0) { 154 channelCount = 2; 155 } 156 157 // validate parameters 158 if (((format != AudioSystem::PCM_8_BIT) || sharedBuffer != 0) && 159 (format != AudioSystem::PCM_16_BIT)) { 160 LOGE("Invalid format"); 161 return BAD_VALUE; 162 } 163 if (channelCount != 1 && channelCount != 2) { 164 LOGE("Invalid channel number"); 165 return BAD_VALUE; 166 } 167 168 // Ensure that buffer depth covers at least audio hardware latency 169 uint32_t minBufCount = afLatency / ((1000 * afFrameCount)/afSampleRate); 170 if (minBufCount < 2) minBufCount = 2; 171 172 // When playing from shared buffer, playback will start even if last audioflinger 173 // block is partly filled. 174 if (sharedBuffer != 0 && minBufCount > 1) { 175 minBufCount--; 176 } 177 178 int minFrameCount = (afFrameCount*sampleRate*minBufCount)/afSampleRate; 179 180 if (sharedBuffer == 0) { 181 if (frameCount == 0) { 182 frameCount = minFrameCount; 183 } 184 if (notificationFrames == 0) { 185 notificationFrames = frameCount/2; 186 } 187 // Make sure that application is notified with sufficient margin 188 // before underrun 189 if (notificationFrames > frameCount/2) { 190 notificationFrames = frameCount/2; 191 } 192 } else { 193 // Ensure that buffer alignment matches channelcount 194 if (((uint32_t)sharedBuffer->pointer() & (channelCount | 1)) != 0) { 195 LOGE("Invalid buffer alignement: address %p, channelCount %d", sharedBuffer->pointer(), channelCount); 196 return BAD_VALUE; 197 } 198 frameCount = sharedBuffer->size()/channelCount/sizeof(int16_t); 199 } 200 201 if (frameCount < minFrameCount) { 202 LOGE("Invalid buffer size: minFrameCount %d, frameCount %d", minFrameCount, frameCount); 203 return BAD_VALUE; 204 } 205 206 // create the track 207 status_t status; 208 sp<IAudioTrack> track = audioFlinger->createTrack(getpid(), 209 streamType, sampleRate, format, channelCount, frameCount, flags, sharedBuffer, &status); 210 211 if (track == 0) { 212 LOGE("AudioFlinger could not create track, status: %d", status); 213 return status; 214 } 215 sp<IMemory> cblk = track->getCblk(); 216 if (cblk == 0) { 217 LOGE("Could not get control block"); 218 return NO_INIT; 219 } 220 if (cbf != 0) { 221 mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava); 222 if (mAudioTrackThread == 0) { 223 LOGE("Could not create callback thread"); 224 return NO_INIT; 225 } 226 } 227 228 mStatus = NO_ERROR; 229 230 mAudioTrack = track; 231 mCblkMemory = cblk; 232 mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer()); 233 mCblk->out = 1; 234 // Update buffer size in case it has been limited by AudioFlinger during track creation 235 mFrameCount = mCblk->frameCount; 236 if (sharedBuffer == 0) { 237 mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t); 238 } else { 239 mCblk->buffers = sharedBuffer->pointer(); 240 // Force buffer full condition as data is already present in shared memory 241 mCblk->stepUser(mFrameCount); 242 } 243 mCblk->volume[0] = mCblk->volume[1] = 0x1000; 244 mVolume[LEFT] = 1.0f; 245 mVolume[RIGHT] = 1.0f; 246 mStreamType = streamType; 247 mFormat = format; 248 mChannelCount = channelCount; 249 mSharedBuffer = sharedBuffer; 250 mMuted = false; 251 mActive = 0; 252 mCbf = cbf; 253 mNotificationFrames = notificationFrames; 254 mRemainingFrames = notificationFrames; 255 mUserData = user; 256 mLatency = afLatency + (1000*mFrameCount) / sampleRate; 257 mLoopCount = 0; 258 mMarkerPosition = 0; 259 mMarkerReached = false; 260 mNewPosition = 0; 261 mUpdatePeriod = 0; 262 263 return NO_ERROR; 264} 265 266status_t AudioTrack::initCheck() const 267{ 268 return mStatus; 269} 270 271// ------------------------------------------------------------------------- 272 273uint32_t AudioTrack::latency() const 274{ 275 return mLatency; 276} 277 278int AudioTrack::streamType() const 279{ 280 return mStreamType; 281} 282 283int AudioTrack::format() const 284{ 285 return mFormat; 286} 287 288int AudioTrack::channelCount() const 289{ 290 return mChannelCount; 291} 292 293uint32_t AudioTrack::frameCount() const 294{ 295 return mFrameCount; 296} 297 298int AudioTrack::frameSize() const 299{ 300 return channelCount()*((format() == AudioSystem::PCM_8_BIT) ? sizeof(uint8_t) : sizeof(int16_t)); 301} 302 303sp<IMemory>& AudioTrack::sharedBuffer() 304{ 305 return mSharedBuffer; 306} 307 308// ------------------------------------------------------------------------- 309 310void AudioTrack::start() 311{ 312 sp<AudioTrackThread> t = mAudioTrackThread; 313 314 LOGV("start %p", this); 315 if (t != 0) { 316 if (t->exitPending()) { 317 if (t->requestExitAndWait() == WOULD_BLOCK) { 318 LOGE("AudioTrack::start called from thread"); 319 return; 320 } 321 } 322 t->mLock.lock(); 323 } 324 325 if (android_atomic_or(1, &mActive) == 0) { 326 mNewPosition = mCblk->server + mUpdatePeriod; 327 mCblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS; 328 mCblk->waitTimeMs = 0; 329 if (t != 0) { 330 t->run("AudioTrackThread", THREAD_PRIORITY_AUDIO_CLIENT); 331 } else { 332 setpriority(PRIO_PROCESS, 0, THREAD_PRIORITY_AUDIO_CLIENT); 333 } 334 mAudioTrack->start(); 335 } 336 337 if (t != 0) { 338 t->mLock.unlock(); 339 } 340} 341 342void AudioTrack::stop() 343{ 344 sp<AudioTrackThread> t = mAudioTrackThread; 345 346 LOGV("stop %p", this); 347 if (t != 0) { 348 t->mLock.lock(); 349 } 350 351 if (android_atomic_and(~1, &mActive) == 1) { 352 mCblk->cv.signal(); 353 mAudioTrack->stop(); 354 // Cancel loops (If we are in the middle of a loop, playback 355 // would not stop until loopCount reaches 0). 356 setLoop(0, 0, 0); 357 // the playback head position will reset to 0, so if a marker is set, we need 358 // to activate it again 359 mMarkerReached = false; 360 // Force flush if a shared buffer is used otherwise audioflinger 361 // will not stop before end of buffer is reached. 362 if (mSharedBuffer != 0) { 363 flush(); 364 } 365 if (t != 0) { 366 t->requestExit(); 367 } else { 368 setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_NORMAL); 369 } 370 } 371 372 if (t != 0) { 373 t->mLock.unlock(); 374 } 375} 376 377bool AudioTrack::stopped() const 378{ 379 return !mActive; 380} 381 382void AudioTrack::flush() 383{ 384 LOGV("flush"); 385 386 // clear playback marker and periodic update counter 387 mMarkerPosition = 0; 388 mMarkerReached = false; 389 mUpdatePeriod = 0; 390 391 392 if (!mActive) { 393 mAudioTrack->flush(); 394 // Release AudioTrack callback thread in case it was waiting for new buffers 395 // in AudioTrack::obtainBuffer() 396 mCblk->cv.signal(); 397 } 398} 399 400void AudioTrack::pause() 401{ 402 LOGV("pause"); 403 if (android_atomic_and(~1, &mActive) == 1) { 404 mActive = 0; 405 mAudioTrack->pause(); 406 } 407} 408 409void AudioTrack::mute(bool e) 410{ 411 mAudioTrack->mute(e); 412 mMuted = e; 413} 414 415bool AudioTrack::muted() const 416{ 417 return mMuted; 418} 419 420void AudioTrack::setVolume(float left, float right) 421{ 422 mVolume[LEFT] = left; 423 mVolume[RIGHT] = right; 424 425 // write must be atomic 426 mCblk->volumeLR = (int32_t(int16_t(left * 0x1000)) << 16) | int16_t(right * 0x1000); 427} 428 429void AudioTrack::getVolume(float* left, float* right) 430{ 431 *left = mVolume[LEFT]; 432 *right = mVolume[RIGHT]; 433} 434 435status_t AudioTrack::setSampleRate(int rate) 436{ 437 int afSamplingRate; 438 439 if (AudioSystem::getOutputSamplingRate(&afSamplingRate, mStreamType) != NO_ERROR) { 440 return NO_INIT; 441 } 442 // Resampler implementation limits input sampling rate to 2 x output sampling rate. 443 if (rate <= 0 || rate > afSamplingRate*2 ) return BAD_VALUE; 444 445 mCblk->sampleRate = rate; 446 return NO_ERROR; 447} 448 449uint32_t AudioTrack::getSampleRate() 450{ 451 return mCblk->sampleRate; 452} 453 454status_t AudioTrack::setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount) 455{ 456 audio_track_cblk_t* cblk = mCblk; 457 458 459 Mutex::Autolock _l(cblk->lock); 460 461 if (loopCount == 0) { 462 cblk->loopStart = UINT_MAX; 463 cblk->loopEnd = UINT_MAX; 464 cblk->loopCount = 0; 465 mLoopCount = 0; 466 return NO_ERROR; 467 } 468 469 if (loopStart >= loopEnd || 470 loopEnd - loopStart > mFrameCount) { 471 LOGE("setLoop invalid value: loopStart %d, loopEnd %d, loopCount %d, framecount %d, user %d", loopStart, loopEnd, loopCount, mFrameCount, cblk->user); 472 return BAD_VALUE; 473 } 474 475 if ((mSharedBuffer != 0) && (loopEnd > mFrameCount)) { 476 LOGE("setLoop invalid value: loop markers beyond data: loopStart %d, loopEnd %d, framecount %d", 477 loopStart, loopEnd, mFrameCount); 478 return BAD_VALUE; 479 } 480 481 cblk->loopStart = loopStart; 482 cblk->loopEnd = loopEnd; 483 cblk->loopCount = loopCount; 484 mLoopCount = loopCount; 485 486 return NO_ERROR; 487} 488 489status_t AudioTrack::getLoop(uint32_t *loopStart, uint32_t *loopEnd, int *loopCount) 490{ 491 if (loopStart != 0) { 492 *loopStart = mCblk->loopStart; 493 } 494 if (loopEnd != 0) { 495 *loopEnd = mCblk->loopEnd; 496 } 497 if (loopCount != 0) { 498 if (mCblk->loopCount < 0) { 499 *loopCount = -1; 500 } else { 501 *loopCount = mCblk->loopCount; 502 } 503 } 504 505 return NO_ERROR; 506} 507 508status_t AudioTrack::setMarkerPosition(uint32_t marker) 509{ 510 if (mCbf == 0) return INVALID_OPERATION; 511 512 mMarkerPosition = marker; 513 mMarkerReached = false; 514 515 return NO_ERROR; 516} 517 518status_t AudioTrack::getMarkerPosition(uint32_t *marker) 519{ 520 if (marker == 0) return BAD_VALUE; 521 522 *marker = mMarkerPosition; 523 524 return NO_ERROR; 525} 526 527status_t AudioTrack::setPositionUpdatePeriod(uint32_t updatePeriod) 528{ 529 if (mCbf == 0) return INVALID_OPERATION; 530 531 uint32_t curPosition; 532 getPosition(&curPosition); 533 mNewPosition = curPosition + updatePeriod; 534 mUpdatePeriod = updatePeriod; 535 536 return NO_ERROR; 537} 538 539status_t AudioTrack::getPositionUpdatePeriod(uint32_t *updatePeriod) 540{ 541 if (updatePeriod == 0) return BAD_VALUE; 542 543 *updatePeriod = mUpdatePeriod; 544 545 return NO_ERROR; 546} 547 548status_t AudioTrack::setPosition(uint32_t position) 549{ 550 Mutex::Autolock _l(mCblk->lock); 551 552 if (!stopped()) return INVALID_OPERATION; 553 554 if (position > mCblk->user) return BAD_VALUE; 555 556 mCblk->server = position; 557 mCblk->forceReady = 1; 558 559 return NO_ERROR; 560} 561 562status_t AudioTrack::getPosition(uint32_t *position) 563{ 564 if (position == 0) return BAD_VALUE; 565 566 *position = mCblk->server; 567 568 return NO_ERROR; 569} 570 571status_t AudioTrack::reload() 572{ 573 if (!stopped()) return INVALID_OPERATION; 574 575 flush(); 576 577 mCblk->stepUser(mFrameCount); 578 579 return NO_ERROR; 580} 581 582// ------------------------------------------------------------------------- 583 584status_t AudioTrack::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 585{ 586 int active; 587 int timeout = 0; 588 status_t result; 589 audio_track_cblk_t* cblk = mCblk; 590 uint32_t framesReq = audioBuffer->frameCount; 591 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 592 593 audioBuffer->frameCount = 0; 594 audioBuffer->size = 0; 595 596 uint32_t framesAvail = cblk->framesAvailable(); 597 598 if (framesAvail == 0) { 599 Mutex::Autolock _l(cblk->lock); 600 goto start_loop_here; 601 while (framesAvail == 0) { 602 active = mActive; 603 if (UNLIKELY(!active)) { 604 LOGV("Not active and NO_MORE_BUFFERS"); 605 return NO_MORE_BUFFERS; 606 } 607 if (UNLIKELY(!waitCount)) 608 return WOULD_BLOCK; 609 timeout = 0; 610 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 611 if (__builtin_expect(result!=NO_ERROR, false)) { 612 cblk->waitTimeMs += waitTimeMs; 613 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 614 // timing out when a loop has been set and we have already written upto loop end 615 // is a normal condition: no need to wake AudioFlinger up. 616 if (cblk->user < cblk->loopEnd) { 617 LOGW( "obtainBuffer timed out (is the CPU pegged?) %p " 618 "user=%08x, server=%08x", this, cblk->user, cblk->server); 619 //unlock cblk mutex before calling mAudioTrack->start() (see issue #1617140) 620 cblk->lock.unlock(); 621 mAudioTrack->start(); 622 cblk->lock.lock(); 623 timeout = 1; 624 } 625 cblk->waitTimeMs = 0; 626 } 627 628 if (--waitCount == 0) { 629 return TIMED_OUT; 630 } 631 } 632 // read the server count again 633 start_loop_here: 634 framesAvail = cblk->framesAvailable_l(); 635 } 636 } 637 638 cblk->waitTimeMs = 0; 639 640 if (framesReq > framesAvail) { 641 framesReq = framesAvail; 642 } 643 644 uint32_t u = cblk->user; 645 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 646 647 if (u + framesReq > bufferEnd) { 648 framesReq = bufferEnd - u; 649 } 650 651 LOGW_IF(timeout, 652 "*** SERIOUS WARNING *** obtainBuffer() timed out " 653 "but didn't need to be locked. We recovered, but " 654 "this shouldn't happen (user=%08x, server=%08x)", cblk->user, cblk->server); 655 656 audioBuffer->flags = mMuted ? Buffer::MUTE : 0; 657 audioBuffer->channelCount= mChannelCount; 658 audioBuffer->format = AudioSystem::PCM_16_BIT; 659 audioBuffer->frameCount = framesReq; 660 audioBuffer->size = framesReq*mChannelCount*sizeof(int16_t); 661 audioBuffer->raw = (int8_t *)cblk->buffer(u); 662 active = mActive; 663 return active ? status_t(NO_ERROR) : status_t(STOPPED); 664} 665 666void AudioTrack::releaseBuffer(Buffer* audioBuffer) 667{ 668 audio_track_cblk_t* cblk = mCblk; 669 cblk->stepUser(audioBuffer->frameCount); 670} 671 672// ------------------------------------------------------------------------- 673 674ssize_t AudioTrack::write(const void* buffer, size_t userSize) 675{ 676 677 if (mSharedBuffer != 0) return INVALID_OPERATION; 678 679 if (ssize_t(userSize) < 0) { 680 // sanity-check. user is most-likely passing an error code. 681 LOGE("AudioTrack::write(buffer=%p, size=%u (%d)", 682 buffer, userSize, userSize); 683 return BAD_VALUE; 684 } 685 686 LOGV("write %p: %d bytes, mActive=%d", this, userSize, mActive); 687 688 ssize_t written = 0; 689 const int8_t *src = (const int8_t *)buffer; 690 Buffer audioBuffer; 691 692 do { 693 audioBuffer.frameCount = userSize/mChannelCount; 694 if (mFormat == AudioSystem::PCM_16_BIT) { 695 audioBuffer.frameCount >>= 1; 696 } 697 // Calling obtainBuffer() with a negative wait count causes 698 // an (almost) infinite wait time. 699 status_t err = obtainBuffer(&audioBuffer, -1); 700 if (err < 0) { 701 // out of buffers, return #bytes written 702 if (err == status_t(NO_MORE_BUFFERS)) 703 break; 704 return ssize_t(err); 705 } 706 707 size_t toWrite; 708 if (mFormat == AudioSystem::PCM_8_BIT) { 709 // Divide capacity by 2 to take expansion into account 710 toWrite = audioBuffer.size>>1; 711 // 8 to 16 bit conversion 712 int count = toWrite; 713 int16_t *dst = (int16_t *)(audioBuffer.i8); 714 while(count--) { 715 *dst++ = (int16_t)(*src++^0x80) << 8; 716 } 717 }else { 718 toWrite = audioBuffer.size; 719 memcpy(audioBuffer.i8, src, toWrite); 720 src += toWrite; 721 } 722 userSize -= toWrite; 723 written += toWrite; 724 725 releaseBuffer(&audioBuffer); 726 } while (userSize); 727 728 return written; 729} 730 731// ------------------------------------------------------------------------- 732 733bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread) 734{ 735 Buffer audioBuffer; 736 uint32_t frames; 737 size_t writtenSize; 738 739 // Manage underrun callback 740 if (mActive && (mCblk->framesReady() == 0)) { 741 LOGV("Underrun user: %x, server: %x, flowControlFlag %d", mCblk->user, mCblk->server, mCblk->flowControlFlag); 742 if (mCblk->flowControlFlag == 0) { 743 mCbf(EVENT_UNDERRUN, mUserData, 0); 744 if (mCblk->server == mCblk->frameCount) { 745 mCbf(EVENT_BUFFER_END, mUserData, 0); 746 } 747 mCblk->flowControlFlag = 1; 748 if (mSharedBuffer != 0) return false; 749 } 750 } 751 752 // Manage loop end callback 753 while (mLoopCount > mCblk->loopCount) { 754 int loopCount = -1; 755 mLoopCount--; 756 if (mLoopCount >= 0) loopCount = mLoopCount; 757 758 mCbf(EVENT_LOOP_END, mUserData, (void *)&loopCount); 759 } 760 761 // Manage marker callback 762 if (!mMarkerReached && (mMarkerPosition > 0)) { 763 if (mCblk->server >= mMarkerPosition) { 764 mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition); 765 mMarkerReached = true; 766 } 767 } 768 769 // Manage new position callback 770 if(mUpdatePeriod > 0) { 771 while (mCblk->server >= mNewPosition) { 772 mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition); 773 mNewPosition += mUpdatePeriod; 774 } 775 } 776 777 // If Shared buffer is used, no data is requested from client. 778 if (mSharedBuffer != 0) { 779 frames = 0; 780 } else { 781 frames = mRemainingFrames; 782 } 783 784 do { 785 786 audioBuffer.frameCount = frames; 787 788 // Calling obtainBuffer() with a wait count of 1 789 // limits wait time to WAIT_PERIOD_MS. This prevents from being 790 // stuck here not being able to handle timed events (position, markers, loops). 791 status_t err = obtainBuffer(&audioBuffer, 1); 792 if (err < NO_ERROR) { 793 if (err != TIMED_OUT) { 794 LOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up."); 795 return false; 796 } 797 break; 798 } 799 if (err == status_t(STOPPED)) return false; 800 801 // Divide buffer size by 2 to take into account the expansion 802 // due to 8 to 16 bit conversion: the callback must fill only half 803 // of the destination buffer 804 if (mFormat == AudioSystem::PCM_8_BIT) { 805 audioBuffer.size >>= 1; 806 } 807 808 size_t reqSize = audioBuffer.size; 809 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 810 writtenSize = audioBuffer.size; 811 812 // Sanity check on returned size 813 if (ssize_t(writtenSize) <= 0) { 814 // The callback is done filling buffers 815 // Keep this thread going to handle timed events and 816 // still try to get more data in intervals of WAIT_PERIOD_MS 817 // but don't just loop and block the CPU, so wait 818 usleep(WAIT_PERIOD_MS*1000); 819 break; 820 } 821 if (writtenSize > reqSize) writtenSize = reqSize; 822 823 if (mFormat == AudioSystem::PCM_8_BIT) { 824 // 8 to 16 bit conversion 825 const int8_t *src = audioBuffer.i8 + writtenSize-1; 826 int count = writtenSize; 827 int16_t *dst = audioBuffer.i16 + writtenSize-1; 828 while(count--) { 829 *dst-- = (int16_t)(*src--^0x80) << 8; 830 } 831 writtenSize <<= 1; 832 } 833 834 audioBuffer.size = writtenSize; 835 audioBuffer.frameCount = writtenSize/mChannelCount/sizeof(int16_t); 836 frames -= audioBuffer.frameCount; 837 838 releaseBuffer(&audioBuffer); 839 } 840 while (frames); 841 842 if (frames == 0) { 843 mRemainingFrames = mNotificationFrames; 844 } else { 845 mRemainingFrames = frames; 846 } 847 return true; 848} 849 850status_t AudioTrack::dump(int fd, const Vector<String16>& args) const 851{ 852 853 const size_t SIZE = 256; 854 char buffer[SIZE]; 855 String8 result; 856 857 result.append(" AudioTrack::dump\n"); 858 snprintf(buffer, 255, " stream type(%d), left - right volume(%f, %f)\n", mStreamType, mVolume[0], mVolume[1]); 859 result.append(buffer); 860 snprintf(buffer, 255, " format(%d), channel count(%d), frame count(%d)\n", mFormat, mChannelCount, mFrameCount); 861 result.append(buffer); 862 snprintf(buffer, 255, " sample rate(%d), status(%d), muted(%d)\n", (mCblk == 0) ? 0 : mCblk->sampleRate, mStatus, mMuted); 863 result.append(buffer); 864 snprintf(buffer, 255, " active(%d), latency (%d)\n", mActive, mLatency); 865 result.append(buffer); 866 ::write(fd, result.string(), result.size()); 867 return NO_ERROR; 868} 869 870// ========================================================================= 871 872AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava) 873 : Thread(bCanCallJava), mReceiver(receiver) 874{ 875} 876 877bool AudioTrack::AudioTrackThread::threadLoop() 878{ 879 return mReceiver.processAudioBuffer(this); 880} 881 882status_t AudioTrack::AudioTrackThread::readyToRun() 883{ 884 return NO_ERROR; 885} 886 887void AudioTrack::AudioTrackThread::onFirstRef() 888{ 889} 890 891// ========================================================================= 892 893audio_track_cblk_t::audio_track_cblk_t() 894 : user(0), server(0), userBase(0), serverBase(0), buffers(0), frameCount(0), 895 loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), volumeLR(0), flowControlFlag(1), forceReady(0) 896{ 897} 898 899uint32_t audio_track_cblk_t::stepUser(uint32_t frameCount) 900{ 901 uint32_t u = this->user; 902 903 u += frameCount; 904 // Ensure that user is never ahead of server for AudioRecord 905 if (out) { 906 // If stepServer() has been called once, switch to normal obtainBuffer() timeout period 907 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) { 908 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 909 } 910 } else if (u > this->server) { 911 LOGW("stepServer occured after track reset"); 912 u = this->server; 913 } 914 915 if (u >= userBase + this->frameCount) { 916 userBase += this->frameCount; 917 } 918 919 this->user = u; 920 921 // Clear flow control error condition as new data has been written/read to/from buffer. 922 flowControlFlag = 0; 923 924 return u; 925} 926 927bool audio_track_cblk_t::stepServer(uint32_t frameCount) 928{ 929 // the code below simulates lock-with-timeout 930 // we MUST do this to protect the AudioFlinger server 931 // as this lock is shared with the client. 932 status_t err; 933 934 err = lock.tryLock(); 935 if (err == -EBUSY) { // just wait a bit 936 usleep(1000); 937 err = lock.tryLock(); 938 } 939 if (err != NO_ERROR) { 940 // probably, the client just died. 941 return false; 942 } 943 944 uint32_t s = this->server; 945 946 s += frameCount; 947 if (out) { 948 // Mark that we have read the first buffer so that next time stepUser() is called 949 // we switch to normal obtainBuffer() timeout period 950 if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) { 951 bufferTimeoutMs = MAX_RUN_TIMEOUT_MS - 1; 952 } 953 // It is possible that we receive a flush() 954 // while the mixer is processing a block: in this case, 955 // stepServer() is called After the flush() has reset u & s and 956 // we have s > u 957 if (s > this->user) { 958 LOGW("stepServer occured after track reset"); 959 s = this->user; 960 } 961 } 962 963 if (s >= loopEnd) { 964 LOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd); 965 s = loopStart; 966 if (--loopCount == 0) { 967 loopEnd = UINT_MAX; 968 loopStart = UINT_MAX; 969 } 970 } 971 if (s >= serverBase + this->frameCount) { 972 serverBase += this->frameCount; 973 } 974 975 this->server = s; 976 977 cv.signal(); 978 lock.unlock(); 979 return true; 980} 981 982void* audio_track_cblk_t::buffer(uint32_t offset) const 983{ 984 return (int16_t *)this->buffers + (offset-userBase)*this->channels; 985} 986 987uint32_t audio_track_cblk_t::framesAvailable() 988{ 989 Mutex::Autolock _l(lock); 990 return framesAvailable_l(); 991} 992 993uint32_t audio_track_cblk_t::framesAvailable_l() 994{ 995 uint32_t u = this->user; 996 uint32_t s = this->server; 997 998 if (out) { 999 uint32_t limit = (s < loopStart) ? s : loopStart; 1000 return limit + frameCount - u; 1001 } else { 1002 return frameCount + u - s; 1003 } 1004} 1005 1006uint32_t audio_track_cblk_t::framesReady() 1007{ 1008 uint32_t u = this->user; 1009 uint32_t s = this->server; 1010 1011 if (out) { 1012 if (u < loopEnd) { 1013 return u - s; 1014 } else { 1015 Mutex::Autolock _l(lock); 1016 if (loopCount >= 0) { 1017 return (loopEnd - loopStart)*loopCount + u - s; 1018 } else { 1019 return UINT_MAX; 1020 } 1021 } 1022 } else { 1023 return s - u; 1024 } 1025} 1026 1027// ------------------------------------------------------------------------- 1028 1029}; // namespace android 1030 1031