AudioRecord.cpp revision 3b16c766d1ae2cfd8487e8ffb2b23936fc0a8e17
1/* 2** 3** Copyright 2008, 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//#define LOG_NDEBUG 0 19#define LOG_TAG "AudioRecord" 20 21#include <sys/resource.h> 22#include <sys/types.h> 23 24#include <binder/IPCThreadState.h> 25#include <cutils/atomic.h> 26#include <cutils/compiler.h> 27#include <media/AudioRecord.h> 28#include <media/AudioSystem.h> 29#include <system/audio.h> 30#include <utils/Log.h> 31 32#include <private/media/AudioTrackShared.h> 33 34namespace android { 35// --------------------------------------------------------------------------- 36 37// static 38status_t AudioRecord::getMinFrameCount( 39 int* frameCount, 40 uint32_t sampleRate, 41 audio_format_t format, 42 audio_channel_mask_t channelMask) 43{ 44 if (frameCount == NULL) return BAD_VALUE; 45 46 // default to 0 in case of error 47 *frameCount = 0; 48 49 size_t size = 0; 50 if (AudioSystem::getInputBufferSize(sampleRate, format, channelMask, &size) 51 != NO_ERROR) { 52 ALOGE("AudioSystem could not query the input buffer size."); 53 return NO_INIT; 54 } 55 56 if (size == 0) { 57 ALOGE("Unsupported configuration: sampleRate %u, format %d, channelMask %#x", 58 sampleRate, format, channelMask); 59 return BAD_VALUE; 60 } 61 62 // We double the size of input buffer for ping pong use of record buffer. 63 size <<= 1; 64 65 if (audio_is_linear_pcm(format)) { 66 int channelCount = popcount(channelMask); 67 size /= channelCount * audio_bytes_per_sample(format); 68 } 69 70 *frameCount = size; 71 return NO_ERROR; 72} 73 74// --------------------------------------------------------------------------- 75 76AudioRecord::AudioRecord() 77 : mStatus(NO_INIT), mSessionId(0), 78 mPreviousPriority(ANDROID_PRIORITY_NORMAL), mPreviousSchedulingGroup(SP_DEFAULT) 79{ 80} 81 82AudioRecord::AudioRecord( 83 audio_source_t inputSource, 84 uint32_t sampleRate, 85 audio_format_t format, 86 audio_channel_mask_t channelMask, 87 int frameCount, 88 callback_t cbf, 89 void* user, 90 int notificationFrames, 91 int sessionId) 92 : mStatus(NO_INIT), mSessionId(0), 93 mPreviousPriority(ANDROID_PRIORITY_NORMAL), mPreviousSchedulingGroup(SP_DEFAULT) 94{ 95 mStatus = set(inputSource, sampleRate, format, channelMask, 96 frameCount, cbf, user, notificationFrames, sessionId); 97} 98 99AudioRecord::~AudioRecord() 100{ 101 if (mStatus == NO_ERROR) { 102 // Make sure that callback function exits in the case where 103 // it is looping on buffer empty condition in obtainBuffer(). 104 // Otherwise the callback thread will never exit. 105 stop(); 106 if (mAudioRecordThread != 0) { 107 mAudioRecordThread->requestExit(); // see comment in AudioRecord.h 108 mAudioRecordThread->requestExitAndWait(); 109 mAudioRecordThread.clear(); 110 } 111 mAudioRecord.clear(); 112 IPCThreadState::self()->flushCommands(); 113 AudioSystem::releaseAudioSessionId(mSessionId); 114 } 115} 116 117status_t AudioRecord::set( 118 audio_source_t inputSource, 119 uint32_t sampleRate, 120 audio_format_t format, 121 audio_channel_mask_t channelMask, 122 int frameCount, 123 callback_t cbf, 124 void* user, 125 int notificationFrames, 126 bool threadCanCallJava, 127 int sessionId) 128{ 129 130 ALOGV("set(): sampleRate %u, channelMask %#x, frameCount %d", sampleRate, channelMask, 131 frameCount); 132 133 AutoMutex lock(mLock); 134 135 if (mAudioRecord != 0) { 136 return INVALID_OPERATION; 137 } 138 139 if (inputSource == AUDIO_SOURCE_DEFAULT) { 140 inputSource = AUDIO_SOURCE_MIC; 141 } 142 143 if (sampleRate == 0) { 144 sampleRate = DEFAULT_SAMPLE_RATE; 145 } 146 // these below should probably come from the audioFlinger too... 147 if (format == AUDIO_FORMAT_DEFAULT) { 148 format = AUDIO_FORMAT_PCM_16_BIT; 149 } 150 // validate parameters 151 if (!audio_is_valid_format(format)) { 152 ALOGE("Invalid format"); 153 return BAD_VALUE; 154 } 155 156 if (!audio_is_input_channel(channelMask)) { 157 return BAD_VALUE; 158 } 159 160 int channelCount = popcount(channelMask); 161 162 if (sessionId == 0 ) { 163 mSessionId = AudioSystem::newAudioSessionId(); 164 } else { 165 mSessionId = sessionId; 166 } 167 ALOGV("set(): mSessionId %d", mSessionId); 168 169 audio_io_handle_t input = AudioSystem::getInput(inputSource, 170 sampleRate, 171 format, 172 channelMask, 173 mSessionId); 174 if (input == 0) { 175 ALOGE("Could not get audio input for record source %d", inputSource); 176 return BAD_VALUE; 177 } 178 179 // validate framecount 180 int minFrameCount = 0; 181 status_t status = getMinFrameCount(&minFrameCount, sampleRate, format, channelMask); 182 if (status != NO_ERROR) { 183 return status; 184 } 185 ALOGV("AudioRecord::set() minFrameCount = %d", minFrameCount); 186 187 if (frameCount == 0) { 188 frameCount = minFrameCount; 189 } else if (frameCount < minFrameCount) { 190 return BAD_VALUE; 191 } 192 193 if (notificationFrames == 0) { 194 notificationFrames = frameCount/2; 195 } 196 197 // create the IAudioRecord 198 status = openRecord_l(sampleRate, format, channelMask, 199 frameCount, input); 200 if (status != NO_ERROR) { 201 return status; 202 } 203 204 if (cbf != NULL) { 205 mAudioRecordThread = new AudioRecordThread(*this, threadCanCallJava); 206 mAudioRecordThread->run("AudioRecord", ANDROID_PRIORITY_AUDIO); 207 } 208 209 mStatus = NO_ERROR; 210 211 mFormat = format; 212 // Update buffer size in case it has been limited by AudioFlinger during track creation 213 mFrameCount = mCblk->frameCount; 214 mChannelCount = (uint8_t)channelCount; 215 mChannelMask = channelMask; 216 217 if (audio_is_linear_pcm(mFormat)) { 218 mFrameSize = channelCount * audio_bytes_per_sample(format); 219 } else { 220 mFrameSize = sizeof(uint8_t); 221 } 222 223 mActive = false; 224 mCbf = cbf; 225 mNotificationFrames = notificationFrames; 226 mRemainingFrames = notificationFrames; 227 mUserData = user; 228 // TODO: add audio hardware input latency here 229 mLatency = (1000*mFrameCount) / sampleRate; 230 mMarkerPosition = 0; 231 mMarkerReached = false; 232 mNewPosition = 0; 233 mUpdatePeriod = 0; 234 mInputSource = inputSource; 235 mInput = input; 236 AudioSystem::acquireAudioSessionId(mSessionId); 237 238 return NO_ERROR; 239} 240 241status_t AudioRecord::initCheck() const 242{ 243 return mStatus; 244} 245 246// ------------------------------------------------------------------------- 247 248uint32_t AudioRecord::latency() const 249{ 250 return mLatency; 251} 252 253audio_format_t AudioRecord::format() const 254{ 255 return mFormat; 256} 257 258int AudioRecord::channelCount() const 259{ 260 return mChannelCount; 261} 262 263uint32_t AudioRecord::frameCount() const 264{ 265 return mFrameCount; 266} 267 268audio_source_t AudioRecord::inputSource() const 269{ 270 return mInputSource; 271} 272 273// ------------------------------------------------------------------------- 274 275status_t AudioRecord::start(AudioSystem::sync_event_t event, int triggerSession) 276{ 277 status_t ret = NO_ERROR; 278 sp<AudioRecordThread> t = mAudioRecordThread; 279 280 ALOGV("start, sync event %d trigger session %d", event, triggerSession); 281 282 AutoMutex lock(mLock); 283 // acquire a strong reference on the IAudioRecord and IMemory so that they cannot be destroyed 284 // while we are accessing the cblk 285 sp<IAudioRecord> audioRecord = mAudioRecord; 286 sp<IMemory> iMem = mCblkMemory; 287 audio_track_cblk_t* cblk = mCblk; 288 289 if (!mActive) { 290 mActive = true; 291 292 cblk->lock.lock(); 293 if (!(cblk->flags & CBLK_INVALID)) { 294 cblk->lock.unlock(); 295 ALOGV("mAudioRecord->start()"); 296 ret = mAudioRecord->start(event, triggerSession); 297 cblk->lock.lock(); 298 if (ret == DEAD_OBJECT) { 299 android_atomic_or(CBLK_INVALID, &cblk->flags); 300 } 301 } 302 if (cblk->flags & CBLK_INVALID) { 303 audio_track_cblk_t* temp = cblk; 304 ret = restoreRecord_l(temp); 305 cblk = temp; 306 } 307 cblk->lock.unlock(); 308 if (ret == NO_ERROR) { 309 mNewPosition = cblk->user + mUpdatePeriod; 310 cblk->bufferTimeoutMs = (event == AudioSystem::SYNC_EVENT_NONE) ? MAX_RUN_TIMEOUT_MS : 311 AudioSystem::kSyncRecordStartTimeOutMs; 312 cblk->waitTimeMs = 0; 313 if (t != 0) { 314 t->resume(); 315 } else { 316 mPreviousPriority = getpriority(PRIO_PROCESS, 0); 317 get_sched_policy(0, &mPreviousSchedulingGroup); 318 androidSetThreadPriority(0, ANDROID_PRIORITY_AUDIO); 319 } 320 } else { 321 mActive = false; 322 } 323 } 324 325 return ret; 326} 327 328void AudioRecord::stop() 329{ 330 sp<AudioRecordThread> t = mAudioRecordThread; 331 332 ALOGV("stop"); 333 334 AutoMutex lock(mLock); 335 if (mActive) { 336 mActive = false; 337 mCblk->cv.signal(); 338 mAudioRecord->stop(); 339 // the record head position will reset to 0, so if a marker is set, we need 340 // to activate it again 341 mMarkerReached = false; 342 if (t != 0) { 343 t->pause(); 344 } else { 345 setpriority(PRIO_PROCESS, 0, mPreviousPriority); 346 set_sched_policy(0, mPreviousSchedulingGroup); 347 } 348 } 349} 350 351bool AudioRecord::stopped() const 352{ 353 AutoMutex lock(mLock); 354 return !mActive; 355} 356 357uint32_t AudioRecord::getSampleRate() const 358{ 359 return mCblk->sampleRate; 360} 361 362status_t AudioRecord::setMarkerPosition(uint32_t marker) 363{ 364 if (mCbf == NULL) return INVALID_OPERATION; 365 366 AutoMutex lock(mLock); 367 mMarkerPosition = marker; 368 mMarkerReached = false; 369 370 return NO_ERROR; 371} 372 373status_t AudioRecord::getMarkerPosition(uint32_t *marker) const 374{ 375 if (marker == NULL) return BAD_VALUE; 376 377 AutoMutex lock(mLock); 378 *marker = mMarkerPosition; 379 380 return NO_ERROR; 381} 382 383status_t AudioRecord::setPositionUpdatePeriod(uint32_t updatePeriod) 384{ 385 if (mCbf == NULL) return INVALID_OPERATION; 386 387 uint32_t curPosition; 388 getPosition(&curPosition); 389 390 AutoMutex lock(mLock); 391 mNewPosition = curPosition + updatePeriod; 392 mUpdatePeriod = updatePeriod; 393 394 return NO_ERROR; 395} 396 397status_t AudioRecord::getPositionUpdatePeriod(uint32_t *updatePeriod) const 398{ 399 if (updatePeriod == NULL) return BAD_VALUE; 400 401 AutoMutex lock(mLock); 402 *updatePeriod = mUpdatePeriod; 403 404 return NO_ERROR; 405} 406 407status_t AudioRecord::getPosition(uint32_t *position) const 408{ 409 if (position == NULL) return BAD_VALUE; 410 411 AutoMutex lock(mLock); 412 *position = mCblk->user; 413 414 return NO_ERROR; 415} 416 417unsigned int AudioRecord::getInputFramesLost() const 418{ 419 // no need to check mActive, because if inactive this will return 0, which is what we want 420 return AudioSystem::getInputFramesLost(mInput); 421} 422 423// ------------------------------------------------------------------------- 424 425// must be called with mLock held 426status_t AudioRecord::openRecord_l( 427 uint32_t sampleRate, 428 audio_format_t format, 429 audio_channel_mask_t channelMask, 430 int frameCount, 431 audio_io_handle_t input) 432{ 433 status_t status; 434 const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger(); 435 if (audioFlinger == 0) { 436 ALOGE("Could not get audioflinger"); 437 return NO_INIT; 438 } 439 440 pid_t tid = -1; 441 // FIXME see similar logic at AudioTrack 442 443 int originalSessionId = mSessionId; 444 sp<IAudioRecord> record = audioFlinger->openRecord(getpid(), input, 445 sampleRate, format, 446 channelMask, 447 frameCount, 448 IAudioFlinger::TRACK_DEFAULT, 449 tid, 450 &mSessionId, 451 &status); 452 ALOGE_IF(originalSessionId != 0 && mSessionId != originalSessionId, 453 "session ID changed from %d to %d", originalSessionId, mSessionId); 454 455 if (record == 0) { 456 ALOGE("AudioFlinger could not create record track, status: %d", status); 457 return status; 458 } 459 sp<IMemory> iMem = record->getCblk(); 460 if (iMem == 0) { 461 ALOGE("Could not get control block"); 462 return NO_INIT; 463 } 464 mAudioRecord.clear(); 465 mAudioRecord = record; 466 mCblkMemory.clear(); 467 mCblkMemory = iMem; 468 audio_track_cblk_t* cblk = static_cast<audio_track_cblk_t*>(iMem->pointer()); 469 mCblk = cblk; 470 mBuffers = (char*)cblk + sizeof(audio_track_cblk_t); 471 cblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 472 cblk->waitTimeMs = 0; 473 return NO_ERROR; 474} 475 476status_t AudioRecord::obtainBuffer(Buffer* audioBuffer, int32_t waitCount) 477{ 478 AutoMutex lock(mLock); 479 bool active; 480 status_t result = NO_ERROR; 481 audio_track_cblk_t* cblk = mCblk; 482 uint32_t framesReq = audioBuffer->frameCount; 483 uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS; 484 485 audioBuffer->frameCount = 0; 486 audioBuffer->size = 0; 487 488 uint32_t framesReady = cblk->framesReadyIn(); 489 490 if (framesReady == 0) { 491 cblk->lock.lock(); 492 goto start_loop_here; 493 while (framesReady == 0) { 494 active = mActive; 495 if (CC_UNLIKELY(!active)) { 496 cblk->lock.unlock(); 497 return NO_MORE_BUFFERS; 498 } 499 if (CC_UNLIKELY(!waitCount)) { 500 cblk->lock.unlock(); 501 return WOULD_BLOCK; 502 } 503 if (!(cblk->flags & CBLK_INVALID)) { 504 mLock.unlock(); 505 // this condition is in shared memory, so if IAudioRecord and control block 506 // are replaced due to mediaserver death or IAudioRecord invalidation then 507 // cv won't be signalled, but fortunately the timeout will limit the wait 508 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs)); 509 cblk->lock.unlock(); 510 mLock.lock(); 511 if (!mActive) { 512 return status_t(STOPPED); 513 } 514 // IAudioRecord may have been re-created while mLock was unlocked 515 cblk = mCblk; 516 cblk->lock.lock(); 517 } 518 if (cblk->flags & CBLK_INVALID) { 519 goto create_new_record; 520 } 521 if (CC_UNLIKELY(result != NO_ERROR)) { 522 cblk->waitTimeMs += waitTimeMs; 523 if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) { 524 ALOGW( "obtainBuffer timed out (is the CPU pegged?) " 525 "user=%08x, server=%08x", cblk->user, cblk->server); 526 cblk->lock.unlock(); 527 // callback thread or sync event hasn't changed 528 result = mAudioRecord->start(AudioSystem::SYNC_EVENT_SAME, 0); 529 cblk->lock.lock(); 530 if (result == DEAD_OBJECT) { 531 android_atomic_or(CBLK_INVALID, &cblk->flags); 532create_new_record: 533 audio_track_cblk_t* temp = cblk; 534 result = AudioRecord::restoreRecord_l(temp); 535 cblk = temp; 536 } 537 if (result != NO_ERROR) { 538 ALOGW("obtainBuffer create Track error %d", result); 539 cblk->lock.unlock(); 540 return result; 541 } 542 cblk->waitTimeMs = 0; 543 } 544 if (--waitCount == 0) { 545 cblk->lock.unlock(); 546 return TIMED_OUT; 547 } 548 } 549 // read the server count again 550 start_loop_here: 551 framesReady = cblk->framesReadyIn(); 552 } 553 cblk->lock.unlock(); 554 } 555 556 cblk->waitTimeMs = 0; 557 // reset time out to running value after obtaining a buffer 558 cblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS; 559 560 if (framesReq > framesReady) { 561 framesReq = framesReady; 562 } 563 564 uint32_t u = cblk->user; 565 uint32_t bufferEnd = cblk->userBase + cblk->frameCount; 566 567 if (framesReq > bufferEnd - u) { 568 framesReq = bufferEnd - u; 569 } 570 571 audioBuffer->frameCount = framesReq; 572 audioBuffer->size = framesReq * mFrameSize; 573 audioBuffer->raw = cblk->buffer(mBuffers, mFrameSize, u); 574 active = mActive; 575 return active ? status_t(NO_ERROR) : status_t(STOPPED); 576} 577 578void AudioRecord::releaseBuffer(Buffer* audioBuffer) 579{ 580 AutoMutex lock(mLock); 581 mCblk->stepUserIn(audioBuffer->frameCount); 582} 583 584audio_io_handle_t AudioRecord::getInput() const 585{ 586 AutoMutex lock(mLock); 587 return mInput; 588} 589 590// must be called with mLock held 591audio_io_handle_t AudioRecord::getInput_l() 592{ 593 mInput = AudioSystem::getInput(mInputSource, 594 mCblk->sampleRate, 595 mFormat, 596 mChannelMask, 597 mSessionId); 598 return mInput; 599} 600 601int AudioRecord::getSessionId() const 602{ 603 // no lock needed because session ID doesn't change after first set() 604 return mSessionId; 605} 606 607// ------------------------------------------------------------------------- 608 609ssize_t AudioRecord::read(void* buffer, size_t userSize) 610{ 611 ssize_t read = 0; 612 Buffer audioBuffer; 613 int8_t *dst = static_cast<int8_t*>(buffer); 614 615 if (ssize_t(userSize) < 0) { 616 // sanity-check. user is most-likely passing an error code. 617 ALOGE("AudioRecord::read(buffer=%p, size=%u (%d)", 618 buffer, userSize, userSize); 619 return BAD_VALUE; 620 } 621 622 mLock.lock(); 623 // acquire a strong reference on the IAudioRecord and IMemory so that they cannot be destroyed 624 // while we are accessing the cblk 625 sp<IAudioRecord> audioRecord = mAudioRecord; 626 sp<IMemory> iMem = mCblkMemory; 627 mLock.unlock(); 628 629 do { 630 631 audioBuffer.frameCount = userSize/frameSize(); 632 633 // By using a wait count corresponding to twice the timeout period in 634 // obtainBuffer() we give a chance to recover once for a read timeout 635 // (if media_server crashed for instance) before returning a length of 636 // 0 bytes read to the client 637 status_t err = obtainBuffer(&audioBuffer, ((2 * MAX_RUN_TIMEOUT_MS) / WAIT_PERIOD_MS)); 638 if (err < 0) { 639 // out of buffers, return #bytes written 640 if (err == status_t(NO_MORE_BUFFERS)) 641 break; 642 if (err == status_t(TIMED_OUT)) 643 err = 0; 644 return ssize_t(err); 645 } 646 647 size_t bytesRead = audioBuffer.size; 648 memcpy(dst, audioBuffer.i8, bytesRead); 649 650 dst += bytesRead; 651 userSize -= bytesRead; 652 read += bytesRead; 653 654 releaseBuffer(&audioBuffer); 655 } while (userSize); 656 657 return read; 658} 659 660// ------------------------------------------------------------------------- 661 662bool AudioRecord::processAudioBuffer(const sp<AudioRecordThread>& thread) 663{ 664 Buffer audioBuffer; 665 uint32_t frames = mRemainingFrames; 666 size_t readSize; 667 668 mLock.lock(); 669 // acquire a strong reference on the IAudioRecord and IMemory so that they cannot be destroyed 670 // while we are accessing the cblk 671 sp<IAudioRecord> audioRecord = mAudioRecord; 672 sp<IMemory> iMem = mCblkMemory; 673 audio_track_cblk_t* cblk = mCblk; 674 bool active = mActive; 675 uint32_t markerPosition = mMarkerPosition; 676 uint32_t newPosition = mNewPosition; 677 uint32_t user = cblk->user; 678 // determine whether a marker callback will be needed, while locked 679 bool needMarker = !mMarkerReached && (mMarkerPosition > 0) && (user >= mMarkerPosition); 680 if (needMarker) { 681 mMarkerReached = true; 682 } 683 // determine the number of new position callback(s) that will be needed, while locked 684 uint32_t updatePeriod = mUpdatePeriod; 685 uint32_t needNewPos = updatePeriod > 0 && user >= newPosition ? 686 ((user - newPosition) / updatePeriod) + 1 : 0; 687 mNewPosition = newPosition + updatePeriod * needNewPos; 688 mLock.unlock(); 689 690 // perform marker callback, while unlocked 691 if (needMarker) { 692 mCbf(EVENT_MARKER, mUserData, &markerPosition); 693 } 694 695 // perform new position callback(s), while unlocked 696 for (; needNewPos > 0; --needNewPos) { 697 uint32_t temp = newPosition; 698 mCbf(EVENT_NEW_POS, mUserData, &temp); 699 newPosition += updatePeriod; 700 } 701 702 do { 703 audioBuffer.frameCount = frames; 704 // Calling obtainBuffer() with a wait count of 1 705 // limits wait time to WAIT_PERIOD_MS. This prevents from being 706 // stuck here not being able to handle timed events (position, markers). 707 status_t err = obtainBuffer(&audioBuffer, 1); 708 if (err < NO_ERROR) { 709 if (err != TIMED_OUT) { 710 ALOGE_IF(err != status_t(NO_MORE_BUFFERS), 711 "Error obtaining an audio buffer, giving up."); 712 return false; 713 } 714 break; 715 } 716 if (err == status_t(STOPPED)) return false; 717 718 size_t reqSize = audioBuffer.size; 719 mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer); 720 readSize = audioBuffer.size; 721 722 // Sanity check on returned size 723 if (ssize_t(readSize) <= 0) { 724 // The callback is done filling buffers 725 // Keep this thread going to handle timed events and 726 // still try to get more data in intervals of WAIT_PERIOD_MS 727 // but don't just loop and block the CPU, so wait 728 usleep(WAIT_PERIOD_MS*1000); 729 break; 730 } 731 if (readSize > reqSize) readSize = reqSize; 732 733 audioBuffer.size = readSize; 734 audioBuffer.frameCount = readSize/frameSize(); 735 frames -= audioBuffer.frameCount; 736 737 releaseBuffer(&audioBuffer); 738 739 } while (frames); 740 741 742 // Manage overrun callback 743 if (active && (cblk->framesAvailableIn() == 0)) { 744 // The value of active is stale, but we are almost sure to be active here because 745 // otherwise we would have exited when obtainBuffer returned STOPPED earlier. 746 ALOGV("Overrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags); 747 if (!(android_atomic_or(CBLK_UNDERRUN, &cblk->flags) & CBLK_UNDERRUN)) { 748 mCbf(EVENT_OVERRUN, mUserData, NULL); 749 } 750 } 751 752 if (frames == 0) { 753 mRemainingFrames = mNotificationFrames; 754 } else { 755 mRemainingFrames = frames; 756 } 757 return true; 758} 759 760// must be called with mLock and cblk.lock held. Callers must also hold strong references on 761// the IAudioRecord and IMemory in case they are recreated here. 762// If the IAudioRecord is successfully restored, the cblk pointer is updated 763status_t AudioRecord::restoreRecord_l(audio_track_cblk_t*& refCblk) 764{ 765 status_t result; 766 767 audio_track_cblk_t* cblk = refCblk; 768 audio_track_cblk_t* newCblk = cblk; 769 ALOGW("dead IAudioRecord, creating a new one"); 770 771 // signal old cblk condition so that other threads waiting for available buffers stop 772 // waiting now 773 cblk->cv.broadcast(); 774 cblk->lock.unlock(); 775 776 // if the new IAudioRecord is created, openRecord_l() will modify the 777 // following member variables: mAudioRecord, mCblkMemory and mCblk. 778 // It will also delete the strong references on previous IAudioRecord and IMemory 779 result = openRecord_l(cblk->sampleRate, mFormat, mChannelMask, 780 mFrameCount, getInput_l()); 781 if (result == NO_ERROR) { 782 newCblk = mCblk; 783 // callback thread or sync event hasn't changed 784 result = mAudioRecord->start(AudioSystem::SYNC_EVENT_SAME, 0); 785 } 786 if (result != NO_ERROR) { 787 mActive = false; 788 } 789 790 ALOGV("restoreRecord_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x", 791 result, mActive, newCblk, cblk, newCblk->flags, cblk->flags); 792 793 if (result == NO_ERROR) { 794 // from now on we switch to the newly created cblk 795 refCblk = newCblk; 796 } 797 newCblk->lock.lock(); 798 799 ALOGW_IF(result != NO_ERROR, "restoreRecord_l() error %d", result); 800 801 return result; 802} 803 804// ========================================================================= 805 806AudioRecord::AudioRecordThread::AudioRecordThread(AudioRecord& receiver, bool bCanCallJava) 807 : Thread(bCanCallJava), mReceiver(receiver), mPaused(true) 808{ 809} 810 811AudioRecord::AudioRecordThread::~AudioRecordThread() 812{ 813} 814 815bool AudioRecord::AudioRecordThread::threadLoop() 816{ 817 { 818 AutoMutex _l(mMyLock); 819 if (mPaused) { 820 mMyCond.wait(mMyLock); 821 // caller will check for exitPending() 822 return true; 823 } 824 } 825 if (!mReceiver.processAudioBuffer(this)) { 826 pause(); 827 } 828 return true; 829} 830 831void AudioRecord::AudioRecordThread::requestExit() 832{ 833 // must be in this order to avoid a race condition 834 Thread::requestExit(); 835 resume(); 836} 837 838void AudioRecord::AudioRecordThread::pause() 839{ 840 AutoMutex _l(mMyLock); 841 mPaused = true; 842} 843 844void AudioRecord::AudioRecordThread::resume() 845{ 846 AutoMutex _l(mMyLock); 847 if (mPaused) { 848 mPaused = false; 849 mMyCond.signal(); 850 } 851} 852 853// ------------------------------------------------------------------------- 854 855}; // namespace android 856