AudioRecord.cpp revision 0e265cf36d201a7ccc0238b5c60b50f43d1dc450 
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 <stdint.h>
22#include <sys/types.h>
23
24#include <sched.h>
25#include <sys/resource.h>
26
27#include <private/media/AudioTrackShared.h>
28
29#include <media/AudioSystem.h>
30#include <media/AudioRecord.h>
31#include <media/mediarecorder.h>
32
33#include <binder/IServiceManager.h>
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 <system/audio.h>
41#include <cutils/bitops.h>
42#include <cutils/compiler.h>
43
44namespace android {
45// ---------------------------------------------------------------------------
46
47// static
48status_t AudioRecord::getMinFrameCount(
49        int* frameCount,
50        uint32_t sampleRate,
51        audio_format_t format,
52        int channelCount)
53{
54    size_t size = 0;
55    if (AudioSystem::getInputBufferSize(sampleRate, format, channelCount, &size)
56            != NO_ERROR) {
57        ALOGE("AudioSystem could not query the input buffer size.");
58        return NO_INIT;
59    }
60
61    if (size == 0) {
62        ALOGE("Unsupported configuration: sampleRate %d, format %d, channelCount %d",
63            sampleRate, format, channelCount);
64        return BAD_VALUE;
65    }
66
67    // We double the size of input buffer for ping pong use of record buffer.
68    size <<= 1;
69
70    if (audio_is_linear_pcm(format)) {
71        size /= channelCount * audio_bytes_per_sample(format);
72    }
73
74    *frameCount = size;
75    return NO_ERROR;
76}
77
78// ---------------------------------------------------------------------------
79
80AudioRecord::AudioRecord()
81    : mStatus(NO_INIT), mSessionId(0),
82      mPreviousPriority(ANDROID_PRIORITY_NORMAL), mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT)
83{
84}
85
86AudioRecord::AudioRecord(
87        audio_source_t inputSource,
88        uint32_t sampleRate,
89        audio_format_t format,
90        uint32_t channelMask,
91        int frameCount,
92        uint32_t flags,
93        callback_t cbf,
94        void* user,
95        int notificationFrames,
96        int sessionId)
97    : mStatus(NO_INIT), mSessionId(0),
98      mPreviousPriority(ANDROID_PRIORITY_NORMAL), mPreviousSchedulingGroup(ANDROID_TGROUP_DEFAULT)
99{
100    mStatus = set(inputSource, sampleRate, format, channelMask,
101            frameCount, flags, cbf, user, notificationFrames, sessionId);
102}
103
104AudioRecord::~AudioRecord()
105{
106    if (mStatus == NO_ERROR) {
107        // Make sure that callback function exits in the case where
108        // it is looping on buffer empty condition in obtainBuffer().
109        // Otherwise the callback thread will never exit.
110        stop();
111        if (mClientRecordThread != 0) {
112            mClientRecordThread->requestExitAndWait();
113            mClientRecordThread.clear();
114        }
115        mAudioRecord.clear();
116        IPCThreadState::self()->flushCommands();
117        AudioSystem::releaseAudioSessionId(mSessionId);
118    }
119}
120
121status_t AudioRecord::set(
122        audio_source_t inputSource,
123        uint32_t sampleRate,
124        audio_format_t format,
125        uint32_t channelMask,
126        int frameCount,
127        uint32_t flags,
128        callback_t cbf,
129        void* user,
130        int notificationFrames,
131        bool threadCanCallJava,
132        int sessionId)
133{
134
135    ALOGV("set(): sampleRate %d, channelMask %d, frameCount %d",sampleRate, channelMask, frameCount);
136
137    AutoMutex lock(mLock);
138
139    if (mAudioRecord != 0) {
140        return INVALID_OPERATION;
141    }
142
143    if (inputSource == AUDIO_SOURCE_DEFAULT) {
144        inputSource = AUDIO_SOURCE_MIC;
145    }
146
147    if (sampleRate == 0) {
148        sampleRate = DEFAULT_SAMPLE_RATE;
149    }
150    // these below should probably come from the audioFlinger too...
151    if (format == AUDIO_FORMAT_DEFAULT) {
152        format = AUDIO_FORMAT_PCM_16_BIT;
153    }
154    // validate parameters
155    if (!audio_is_valid_format(format)) {
156        ALOGE("Invalid format");
157        return BAD_VALUE;
158    }
159
160    if (!audio_is_input_channel(channelMask)) {
161        return BAD_VALUE;
162    }
163
164    int channelCount = popcount(channelMask);
165
166    if (sessionId == 0 ) {
167        mSessionId = AudioSystem::newAudioSessionId();
168    } else {
169        mSessionId = sessionId;
170    }
171    ALOGV("set(): mSessionId %d", mSessionId);
172
173    audio_io_handle_t input = AudioSystem::getInput(inputSource,
174                                                    sampleRate,
175                                                    format,
176                                                    channelMask,
177                                                    (audio_in_acoustics_t)flags,
178                                                    mSessionId);
179    if (input == 0) {
180        ALOGE("Could not get audio input for record source %d", inputSource);
181        return BAD_VALUE;
182    }
183
184    // validate framecount
185    int minFrameCount = 0;
186    status_t status = getMinFrameCount(&minFrameCount, sampleRate, format, channelCount);
187    if (status != NO_ERROR) {
188        return status;
189    }
190    ALOGV("AudioRecord::set() minFrameCount = %d", minFrameCount);
191
192    if (frameCount == 0) {
193        frameCount = minFrameCount;
194    } else if (frameCount < minFrameCount) {
195        return BAD_VALUE;
196    }
197
198    if (notificationFrames == 0) {
199        notificationFrames = frameCount/2;
200    }
201
202    // create the IAudioRecord
203    status = openRecord_l(sampleRate, format, channelMask,
204                        frameCount, flags, input);
205    if (status != NO_ERROR) {
206        return status;
207    }
208
209    if (cbf != 0) {
210        mClientRecordThread = new ClientRecordThread(*this, threadCanCallJava);
211    }
212
213    mStatus = NO_ERROR;
214
215    mFormat = format;
216    // Update buffer size in case it has been limited by AudioFlinger during track creation
217    mFrameCount = mCblk->frameCount;
218    mChannelCount = (uint8_t)channelCount;
219    mChannelMask = channelMask;
220    mActive = 0;
221    mCbf = cbf;
222    mNotificationFrames = notificationFrames;
223    mRemainingFrames = notificationFrames;
224    mUserData = user;
225    // TODO: add audio hardware input latency here
226    mLatency = (1000*mFrameCount) / sampleRate;
227    mMarkerPosition = 0;
228    mMarkerReached = false;
229    mNewPosition = 0;
230    mUpdatePeriod = 0;
231    mInputSource = inputSource;
232    mFlags = flags;
233    mInput = input;
234    AudioSystem::acquireAudioSessionId(mSessionId);
235
236    return NO_ERROR;
237}
238
239status_t AudioRecord::initCheck() const
240{
241    return mStatus;
242}
243
244// -------------------------------------------------------------------------
245
246uint32_t AudioRecord::latency() const
247{
248    return mLatency;
249}
250
251audio_format_t AudioRecord::format() const
252{
253    return mFormat;
254}
255
256int AudioRecord::channelCount() const
257{
258    return mChannelCount;
259}
260
261uint32_t AudioRecord::frameCount() const
262{
263    return mFrameCount;
264}
265
266size_t AudioRecord::frameSize() const
267{
268    if (audio_is_linear_pcm(mFormat)) {
269        return channelCount()*audio_bytes_per_sample(mFormat);
270    } else {
271        return sizeof(uint8_t);
272    }
273}
274
275audio_source_t AudioRecord::inputSource() const
276{
277    return mInputSource;
278}
279
280// -------------------------------------------------------------------------
281
282status_t AudioRecord::start()
283{
284    status_t ret = NO_ERROR;
285    sp<ClientRecordThread> t = mClientRecordThread;
286
287    ALOGV("start");
288
289    if (t != 0) {
290        if (t->exitPending()) {
291            if (t->requestExitAndWait() == WOULD_BLOCK) {
292                ALOGE("AudioRecord::start called from thread");
293                return WOULD_BLOCK;
294            }
295        }
296     }
297
298    AutoMutex lock(mLock);
299    // acquire a strong reference on the IAudioRecord and IMemory so that they cannot be destroyed
300    // while we are accessing the cblk
301    sp <IAudioRecord> audioRecord = mAudioRecord;
302    sp <IMemory> iMem = mCblkMemory;
303    audio_track_cblk_t* cblk = mCblk;
304    if (mActive == 0) {
305        mActive = 1;
306
307        cblk->lock.lock();
308        if (!(cblk->flags & CBLK_INVALID_MSK)) {
309            cblk->lock.unlock();
310            ret = mAudioRecord->start();
311            cblk->lock.lock();
312            if (ret == DEAD_OBJECT) {
313                android_atomic_or(CBLK_INVALID_ON, &cblk->flags);
314            }
315        }
316        if (cblk->flags & CBLK_INVALID_MSK) {
317            ret = restoreRecord_l(cblk);
318        }
319        cblk->lock.unlock();
320        if (ret == NO_ERROR) {
321            mNewPosition = cblk->user + mUpdatePeriod;
322            cblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS;
323            cblk->waitTimeMs = 0;
324            if (t != 0) {
325                t->run("ClientRecordThread", ANDROID_PRIORITY_AUDIO);
326            } else {
327                mPreviousPriority = getpriority(PRIO_PROCESS, 0);
328                mPreviousSchedulingGroup = androidGetThreadSchedulingGroup(0);
329                androidSetThreadPriority(0, ANDROID_PRIORITY_AUDIO);
330            }
331        } else {
332            mActive = 0;
333        }
334    }
335
336    return ret;
337}
338
339status_t AudioRecord::stop()
340{
341    sp<ClientRecordThread> t = mClientRecordThread;
342
343    ALOGV("stop");
344
345    AutoMutex lock(mLock);
346    if (mActive == 1) {
347        mActive = 0;
348        mCblk->cv.signal();
349        mAudioRecord->stop();
350        // the record head position will reset to 0, so if a marker is set, we need
351        // to activate it again
352        mMarkerReached = false;
353        if (t != 0) {
354            t->requestExit();
355        } else {
356            setpriority(PRIO_PROCESS, 0, mPreviousPriority);
357            androidSetThreadSchedulingGroup(0, mPreviousSchedulingGroup);
358        }
359    }
360
361    return NO_ERROR;
362}
363
364bool AudioRecord::stopped() const
365{
366    return !mActive;
367}
368
369uint32_t AudioRecord::getSampleRate()
370{
371    AutoMutex lock(mLock);
372    return mCblk->sampleRate;
373}
374
375status_t AudioRecord::setMarkerPosition(uint32_t marker)
376{
377    if (mCbf == 0) return INVALID_OPERATION;
378
379    mMarkerPosition = marker;
380    mMarkerReached = false;
381
382    return NO_ERROR;
383}
384
385status_t AudioRecord::getMarkerPosition(uint32_t *marker)
386{
387    if (marker == 0) return BAD_VALUE;
388
389    *marker = mMarkerPosition;
390
391    return NO_ERROR;
392}
393
394status_t AudioRecord::setPositionUpdatePeriod(uint32_t updatePeriod)
395{
396    if (mCbf == 0) return INVALID_OPERATION;
397
398    uint32_t curPosition;
399    getPosition(&curPosition);
400    mNewPosition = curPosition + updatePeriod;
401    mUpdatePeriod = updatePeriod;
402
403    return NO_ERROR;
404}
405
406status_t AudioRecord::getPositionUpdatePeriod(uint32_t *updatePeriod)
407{
408    if (updatePeriod == 0) return BAD_VALUE;
409
410    *updatePeriod = mUpdatePeriod;
411
412    return NO_ERROR;
413}
414
415status_t AudioRecord::getPosition(uint32_t *position)
416{
417    if (position == 0) return BAD_VALUE;
418
419    AutoMutex lock(mLock);
420    *position = mCblk->user;
421
422    return NO_ERROR;
423}
424
425unsigned int AudioRecord::getInputFramesLost()
426{
427    if (mActive)
428        return AudioSystem::getInputFramesLost(mInput);
429    else
430        return 0;
431}
432
433// -------------------------------------------------------------------------
434
435// must be called with mLock held
436status_t AudioRecord::openRecord_l(
437        uint32_t sampleRate,
438        audio_format_t format,
439        uint32_t channelMask,
440        int frameCount,
441        uint32_t flags,
442        audio_io_handle_t input)
443{
444    status_t status;
445    const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger();
446    if (audioFlinger == 0) {
447        return NO_INIT;
448    }
449
450    sp<IAudioRecord> record = audioFlinger->openRecord(getpid(), input,
451                                                       sampleRate, format,
452                                                       channelMask,
453                                                       frameCount,
454                                                       ((uint16_t)flags) << 16,
455                                                       &mSessionId,
456                                                       &status);
457
458    if (record == 0) {
459        ALOGE("AudioFlinger could not create record track, status: %d", status);
460        return status;
461    }
462    sp<IMemory> cblk = record->getCblk();
463    if (cblk == 0) {
464        ALOGE("Could not get control block");
465        return NO_INIT;
466    }
467    mAudioRecord.clear();
468    mAudioRecord = record;
469    mCblkMemory.clear();
470    mCblkMemory = cblk;
471    mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer());
472    mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t);
473    android_atomic_and(~CBLK_DIRECTION_MSK, &mCblk->flags);
474    mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS;
475    mCblk->waitTimeMs = 0;
476    return NO_ERROR;
477}
478
479status_t AudioRecord::obtainBuffer(Buffer* audioBuffer, int32_t waitCount)
480{
481    AutoMutex lock(mLock);
482    int active;
483    status_t result = NO_ERROR;
484    audio_track_cblk_t* cblk = mCblk;
485    uint32_t framesReq = audioBuffer->frameCount;
486    uint32_t waitTimeMs = (waitCount < 0) ? cblk->bufferTimeoutMs : WAIT_PERIOD_MS;
487
488    audioBuffer->frameCount  = 0;
489    audioBuffer->size        = 0;
490
491    uint32_t framesReady = cblk->framesReady();
492
493    if (framesReady == 0) {
494        cblk->lock.lock();
495        goto start_loop_here;
496        while (framesReady == 0) {
497            active = mActive;
498            if (CC_UNLIKELY(!active)) {
499                cblk->lock.unlock();
500                return NO_MORE_BUFFERS;
501            }
502            if (CC_UNLIKELY(!waitCount)) {
503                cblk->lock.unlock();
504                return WOULD_BLOCK;
505            }
506            if (!(cblk->flags & CBLK_INVALID_MSK)) {
507                mLock.unlock();
508                result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs));
509                cblk->lock.unlock();
510                mLock.lock();
511                if (mActive == 0) {
512                    return status_t(STOPPED);
513                }
514                cblk->lock.lock();
515            }
516            if (cblk->flags & CBLK_INVALID_MSK) {
517                goto create_new_record;
518            }
519            if (CC_UNLIKELY(result != NO_ERROR)) {
520                cblk->waitTimeMs += waitTimeMs;
521                if (cblk->waitTimeMs >= cblk->bufferTimeoutMs) {
522                    ALOGW(   "obtainBuffer timed out (is the CPU pegged?) "
523                            "user=%08x, server=%08x", cblk->user, cblk->server);
524                    cblk->lock.unlock();
525                    result = mAudioRecord->start();
526                    cblk->lock.lock();
527                    if (result == DEAD_OBJECT) {
528                        android_atomic_or(CBLK_INVALID_ON, &cblk->flags);
529create_new_record:
530                        result = AudioRecord::restoreRecord_l(cblk);
531                    }
532                    if (result != NO_ERROR) {
533                        ALOGW("obtainBuffer create Track error %d", result);
534                        cblk->lock.unlock();
535                        return result;
536                    }
537                    cblk->waitTimeMs = 0;
538                }
539                if (--waitCount == 0) {
540                    cblk->lock.unlock();
541                    return TIMED_OUT;
542                }
543            }
544            // read the server count again
545        start_loop_here:
546            framesReady = cblk->framesReady();
547        }
548        cblk->lock.unlock();
549    }
550
551    cblk->waitTimeMs = 0;
552
553    if (framesReq > framesReady) {
554        framesReq = framesReady;
555    }
556
557    uint32_t u = cblk->user;
558    uint32_t bufferEnd = cblk->userBase + cblk->frameCount;
559
560    if (u + framesReq > bufferEnd) {
561        framesReq = bufferEnd - u;
562    }
563
564    audioBuffer->flags       = 0;
565    audioBuffer->channelCount= mChannelCount;
566    audioBuffer->format      = mFormat;
567    audioBuffer->frameCount  = framesReq;
568    audioBuffer->size        = framesReq*cblk->frameSize;
569    audioBuffer->raw         = (int8_t*)cblk->buffer(u);
570    active = mActive;
571    return active ? status_t(NO_ERROR) : status_t(STOPPED);
572}
573
574void AudioRecord::releaseBuffer(Buffer* audioBuffer)
575{
576    AutoMutex lock(mLock);
577    mCblk->stepUser(audioBuffer->frameCount);
578}
579
580audio_io_handle_t AudioRecord::getInput()
581{
582    AutoMutex lock(mLock);
583    return mInput;
584}
585
586// must be called with mLock held
587audio_io_handle_t AudioRecord::getInput_l()
588{
589    mInput = AudioSystem::getInput(mInputSource,
590                                mCblk->sampleRate,
591                                mFormat,
592                                mChannelMask,
593                                (audio_in_acoustics_t)mFlags,
594                                mSessionId);
595    return mInput;
596}
597
598int AudioRecord::getSessionId()
599{
600    return mSessionId;
601}
602
603// -------------------------------------------------------------------------
604
605ssize_t AudioRecord::read(void* buffer, size_t userSize)
606{
607    ssize_t read = 0;
608    Buffer audioBuffer;
609    int8_t *dst = static_cast<int8_t*>(buffer);
610
611    if (ssize_t(userSize) < 0) {
612        // sanity-check. user is most-likely passing an error code.
613        ALOGE("AudioRecord::read(buffer=%p, size=%u (%d)",
614                buffer, userSize, userSize);
615        return BAD_VALUE;
616    }
617
618    mLock.lock();
619    // acquire a strong reference on the IAudioRecord and IMemory so that they cannot be destroyed
620    // while we are accessing the cblk
621    sp <IAudioRecord> audioRecord = mAudioRecord;
622    sp <IMemory> iMem = mCblkMemory;
623    mLock.unlock();
624
625    do {
626
627        audioBuffer.frameCount = userSize/frameSize();
628
629        // By using a wait count corresponding to twice the timeout period in
630        // obtainBuffer() we give a chance to recover once for a read timeout
631        // (if media_server crashed for instance) before returning a length of
632        // 0 bytes read to the client
633        status_t err = obtainBuffer(&audioBuffer, ((2 * MAX_RUN_TIMEOUT_MS) / WAIT_PERIOD_MS));
634        if (err < 0) {
635            // out of buffers, return #bytes written
636            if (err == status_t(NO_MORE_BUFFERS))
637                break;
638            if (err == status_t(TIMED_OUT))
639                err = 0;
640            return ssize_t(err);
641        }
642
643        size_t bytesRead = audioBuffer.size;
644        memcpy(dst, audioBuffer.i8, bytesRead);
645
646        dst += bytesRead;
647        userSize -= bytesRead;
648        read += bytesRead;
649
650        releaseBuffer(&audioBuffer);
651    } while (userSize);
652
653    return read;
654}
655
656// -------------------------------------------------------------------------
657
658bool AudioRecord::processAudioBuffer(const sp<ClientRecordThread>& thread)
659{
660    Buffer audioBuffer;
661    uint32_t frames = mRemainingFrames;
662    size_t readSize;
663
664    mLock.lock();
665    // acquire a strong reference on the IAudioRecord and IMemory so that they cannot be destroyed
666    // while we are accessing the cblk
667    sp <IAudioRecord> audioRecord = mAudioRecord;
668    sp <IMemory> iMem = mCblkMemory;
669    audio_track_cblk_t* cblk = mCblk;
670    mLock.unlock();
671
672    // Manage marker callback
673    if (!mMarkerReached && (mMarkerPosition > 0)) {
674        if (cblk->user >= mMarkerPosition) {
675            mCbf(EVENT_MARKER, mUserData, (void *)&mMarkerPosition);
676            mMarkerReached = true;
677        }
678    }
679
680    // Manage new position callback
681    if (mUpdatePeriod > 0) {
682        while (cblk->user >= mNewPosition) {
683            mCbf(EVENT_NEW_POS, mUserData, (void *)&mNewPosition);
684            mNewPosition += mUpdatePeriod;
685        }
686    }
687
688    do {
689        audioBuffer.frameCount = frames;
690        // Calling obtainBuffer() with a wait count of 1
691        // limits wait time to WAIT_PERIOD_MS. This prevents from being
692        // stuck here not being able to handle timed events (position, markers).
693        status_t err = obtainBuffer(&audioBuffer, 1);
694        if (err < NO_ERROR) {
695            if (err != TIMED_OUT) {
696                ALOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up.");
697                return false;
698            }
699            break;
700        }
701        if (err == status_t(STOPPED)) return false;
702
703        size_t reqSize = audioBuffer.size;
704        mCbf(EVENT_MORE_DATA, mUserData, &audioBuffer);
705        readSize = audioBuffer.size;
706
707        // Sanity check on returned size
708        if (ssize_t(readSize) <= 0) {
709            // The callback is done filling buffers
710            // Keep this thread going to handle timed events and
711            // still try to get more data in intervals of WAIT_PERIOD_MS
712            // but don't just loop and block the CPU, so wait
713            usleep(WAIT_PERIOD_MS*1000);
714            break;
715        }
716        if (readSize > reqSize) readSize = reqSize;
717
718        audioBuffer.size = readSize;
719        audioBuffer.frameCount = readSize/frameSize();
720        frames -= audioBuffer.frameCount;
721
722        releaseBuffer(&audioBuffer);
723
724    } while (frames);
725
726
727    // Manage overrun callback
728    if (mActive && (cblk->framesAvailable() == 0)) {
729        ALOGV("Overrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags);
730        if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) {
731            mCbf(EVENT_OVERRUN, mUserData, 0);
732        }
733    }
734
735    if (frames == 0) {
736        mRemainingFrames = mNotificationFrames;
737    } else {
738        mRemainingFrames = frames;
739    }
740    return true;
741}
742
743// must be called with mLock and cblk.lock held. Callers must also hold strong references on
744// the IAudioRecord and IMemory in case they are recreated here.
745// If the IAudioRecord is successfully restored, the cblk pointer is updated
746status_t AudioRecord::restoreRecord_l(audio_track_cblk_t*& cblk)
747{
748    status_t result;
749
750    if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) {
751        ALOGW("dead IAudioRecord, creating a new one");
752        // signal old cblk condition so that other threads waiting for available buffers stop
753        // waiting now
754        cblk->cv.broadcast();
755        cblk->lock.unlock();
756
757        // if the new IAudioRecord is created, openRecord_l() will modify the
758        // following member variables: mAudioRecord, mCblkMemory and mCblk.
759        // It will also delete the strong references on previous IAudioRecord and IMemory
760        result = openRecord_l(cblk->sampleRate, mFormat, mChannelMask,
761                mFrameCount, mFlags, getInput_l());
762        if (result == NO_ERROR) {
763            result = mAudioRecord->start();
764        }
765        if (result != NO_ERROR) {
766            mActive = false;
767        }
768
769        // signal old cblk condition for other threads waiting for restore completion
770        android_atomic_or(CBLK_RESTORED_ON, &cblk->flags);
771        cblk->cv.broadcast();
772    } else {
773        if (!(cblk->flags & CBLK_RESTORED_MSK)) {
774            ALOGW("dead IAudioRecord, waiting for a new one to be created");
775            mLock.unlock();
776            result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS));
777            cblk->lock.unlock();
778            mLock.lock();
779        } else {
780            ALOGW("dead IAudioRecord, already restored");
781            result = NO_ERROR;
782            cblk->lock.unlock();
783        }
784        if (result != NO_ERROR || mActive == 0) {
785            result = status_t(STOPPED);
786        }
787    }
788    ALOGV("restoreRecord_l() status %d mActive %d cblk %p, old cblk %p flags %08x old flags %08x",
789         result, mActive, mCblk, cblk, mCblk->flags, cblk->flags);
790
791    if (result == NO_ERROR) {
792        // from now on we switch to the newly created cblk
793        cblk = mCblk;
794    }
795    cblk->lock.lock();
796
797    ALOGW_IF(result != NO_ERROR, "restoreRecord_l() error %d", result);
798
799    return result;
800}
801
802// =========================================================================
803
804AudioRecord::ClientRecordThread::ClientRecordThread(AudioRecord& receiver, bool bCanCallJava)
805    : Thread(bCanCallJava), mReceiver(receiver)
806{
807}
808
809bool AudioRecord::ClientRecordThread::threadLoop()
810{
811    return mReceiver.processAudioBuffer(this);
812}
813
814// -------------------------------------------------------------------------
815
816}; // namespace android
817
818