SoundPool.cpp revision 79cd8ba46b1ac15f75174beebc1411edea32c05b 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "SoundPool"
19#include <utils/Log.h>
20
21//#define USE_SHARED_MEM_BUFFER
22
23// XXX needed for timing latency
24#include <utils/Timers.h>
25
26#include <media/AudioTrack.h>
27#include <media/mediaplayer.h>
28
29#include <system/audio.h>
30
31#include "SoundPool.h"
32#include "SoundPoolThread.h"
33
34namespace android
35{
36
37int kDefaultBufferCount = 4;
38uint32_t kMaxSampleRate = 48000;
39uint32_t kDefaultSampleRate = 44100;
40uint32_t kDefaultFrameCount = 1200;
41
42SoundPool::SoundPool(int maxChannels, int streamType, int srcQuality)
43{
44    LOGV("SoundPool constructor: maxChannels=%d, streamType=%d, srcQuality=%d",
45            maxChannels, streamType, srcQuality);
46
47    // check limits
48    mMaxChannels = maxChannels;
49    if (mMaxChannels < 1) {
50        mMaxChannels = 1;
51    }
52    else if (mMaxChannels > 32) {
53        mMaxChannels = 32;
54    }
55    LOGW_IF(maxChannels != mMaxChannels, "App requested %d channels", maxChannels);
56
57    mQuit = false;
58    mDecodeThread = 0;
59    mStreamType = streamType;
60    mSrcQuality = srcQuality;
61    mAllocated = 0;
62    mNextSampleID = 0;
63    mNextChannelID = 0;
64
65    mCallback = 0;
66    mUserData = 0;
67
68    mChannelPool = new SoundChannel[mMaxChannels];
69    for (int i = 0; i < mMaxChannels; ++i) {
70        mChannelPool[i].init(this);
71        mChannels.push_back(&mChannelPool[i]);
72    }
73
74    // start decode thread
75    startThreads();
76}
77
78SoundPool::~SoundPool()
79{
80    LOGV("SoundPool destructor");
81    mDecodeThread->quit();
82    quit();
83
84    Mutex::Autolock lock(&mLock);
85
86    mChannels.clear();
87    if (mChannelPool)
88        delete [] mChannelPool;
89    // clean up samples
90    LOGV("clear samples");
91    mSamples.clear();
92
93    if (mDecodeThread)
94        delete mDecodeThread;
95}
96
97void SoundPool::addToRestartList(SoundChannel* channel)
98{
99    Mutex::Autolock lock(&mRestartLock);
100    if (!mQuit) {
101        mRestart.push_back(channel);
102        mCondition.signal();
103    }
104}
105
106void SoundPool::addToStopList(SoundChannel* channel)
107{
108    Mutex::Autolock lock(&mRestartLock);
109    if (!mQuit) {
110        mStop.push_back(channel);
111        mCondition.signal();
112    }
113}
114
115int SoundPool::beginThread(void* arg)
116{
117    SoundPool* p = (SoundPool*)arg;
118    return p->run();
119}
120
121int SoundPool::run()
122{
123    mRestartLock.lock();
124    while (!mQuit) {
125        mCondition.wait(mRestartLock);
126        LOGV("awake");
127        if (mQuit) break;
128
129        while (!mStop.empty()) {
130            SoundChannel* channel;
131            LOGV("Getting channel from stop list");
132            List<SoundChannel* >::iterator iter = mStop.begin();
133            channel = *iter;
134            mStop.erase(iter);
135            mRestartLock.unlock();
136            if (channel != 0) {
137                Mutex::Autolock lock(&mLock);
138                channel->stop();
139            }
140            mRestartLock.lock();
141            if (mQuit) break;
142        }
143
144        while (!mRestart.empty()) {
145            SoundChannel* channel;
146            LOGV("Getting channel from list");
147            List<SoundChannel*>::iterator iter = mRestart.begin();
148            channel = *iter;
149            mRestart.erase(iter);
150            mRestartLock.unlock();
151            if (channel != 0) {
152                Mutex::Autolock lock(&mLock);
153                channel->nextEvent();
154            }
155            mRestartLock.lock();
156            if (mQuit) break;
157        }
158    }
159
160    mStop.clear();
161    mRestart.clear();
162    mCondition.signal();
163    mRestartLock.unlock();
164    LOGV("goodbye");
165    return 0;
166}
167
168void SoundPool::quit()
169{
170    mRestartLock.lock();
171    mQuit = true;
172    mCondition.signal();
173    mCondition.wait(mRestartLock);
174    LOGV("return from quit");
175    mRestartLock.unlock();
176}
177
178bool SoundPool::startThreads()
179{
180    createThreadEtc(beginThread, this, "SoundPool");
181    if (mDecodeThread == NULL)
182        mDecodeThread = new SoundPoolThread(this);
183    return mDecodeThread != NULL;
184}
185
186SoundChannel* SoundPool::findChannel(int channelID)
187{
188    for (int i = 0; i < mMaxChannels; ++i) {
189        if (mChannelPool[i].channelID() == channelID) {
190            return &mChannelPool[i];
191        }
192    }
193    return NULL;
194}
195
196SoundChannel* SoundPool::findNextChannel(int channelID)
197{
198    for (int i = 0; i < mMaxChannels; ++i) {
199        if (mChannelPool[i].nextChannelID() == channelID) {
200            return &mChannelPool[i];
201        }
202    }
203    return NULL;
204}
205
206int SoundPool::load(const char* path, int priority)
207{
208    LOGV("load: path=%s, priority=%d", path, priority);
209    Mutex::Autolock lock(&mLock);
210    sp<Sample> sample = new Sample(++mNextSampleID, path);
211    mSamples.add(sample->sampleID(), sample);
212    doLoad(sample);
213    return sample->sampleID();
214}
215
216int SoundPool::load(int fd, int64_t offset, int64_t length, int priority)
217{
218    LOGV("load: fd=%d, offset=%lld, length=%lld, priority=%d",
219            fd, offset, length, priority);
220    Mutex::Autolock lock(&mLock);
221    sp<Sample> sample = new Sample(++mNextSampleID, fd, offset, length);
222    mSamples.add(sample->sampleID(), sample);
223    doLoad(sample);
224    return sample->sampleID();
225}
226
227void SoundPool::doLoad(sp<Sample>& sample)
228{
229    LOGV("doLoad: loading sample sampleID=%d", sample->sampleID());
230    sample->startLoad();
231    mDecodeThread->loadSample(sample->sampleID());
232}
233
234bool SoundPool::unload(int sampleID)
235{
236    LOGV("unload: sampleID=%d", sampleID);
237    Mutex::Autolock lock(&mLock);
238    return mSamples.removeItem(sampleID);
239}
240
241int SoundPool::play(int sampleID, float leftVolume, float rightVolume,
242        int priority, int loop, float rate)
243{
244    LOGV("play sampleID=%d, leftVolume=%f, rightVolume=%f, priority=%d, loop=%d, rate=%f",
245            sampleID, leftVolume, rightVolume, priority, loop, rate);
246    sp<Sample> sample;
247    SoundChannel* channel;
248    int channelID;
249
250    Mutex::Autolock lock(&mLock);
251
252    if (mQuit) {
253        return 0;
254    }
255    // is sample ready?
256    sample = findSample(sampleID);
257    if ((sample == 0) || (sample->state() != Sample::READY)) {
258        LOGW("  sample %d not READY", sampleID);
259        return 0;
260    }
261
262    dump();
263
264    // allocate a channel
265    channel = allocateChannel_l(priority);
266
267    // no channel allocated - return 0
268    if (!channel) {
269        LOGV("No channel allocated");
270        return 0;
271    }
272
273    channelID = ++mNextChannelID;
274
275    LOGV("play channel %p state = %d", channel, channel->state());
276    channel->play(sample, channelID, leftVolume, rightVolume, priority, loop, rate);
277    return channelID;
278}
279
280SoundChannel* SoundPool::allocateChannel_l(int priority)
281{
282    List<SoundChannel*>::iterator iter;
283    SoundChannel* channel = NULL;
284
285    // allocate a channel
286    if (!mChannels.empty()) {
287        iter = mChannels.begin();
288        if (priority >= (*iter)->priority()) {
289            channel = *iter;
290            mChannels.erase(iter);
291            LOGV("Allocated active channel");
292        }
293    }
294
295    // update priority and put it back in the list
296    if (channel) {
297        channel->setPriority(priority);
298        for (iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
299            if (priority < (*iter)->priority()) {
300                break;
301            }
302        }
303        mChannels.insert(iter, channel);
304    }
305    return channel;
306}
307
308// move a channel from its current position to the front of the list
309void SoundPool::moveToFront_l(SoundChannel* channel)
310{
311    for (List<SoundChannel*>::iterator iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
312        if (*iter == channel) {
313            mChannels.erase(iter);
314            mChannels.push_front(channel);
315            break;
316        }
317    }
318}
319
320void SoundPool::pause(int channelID)
321{
322    LOGV("pause(%d)", channelID);
323    Mutex::Autolock lock(&mLock);
324    SoundChannel* channel = findChannel(channelID);
325    if (channel) {
326        channel->pause();
327    }
328}
329
330void SoundPool::autoPause()
331{
332    LOGV("autoPause()");
333    Mutex::Autolock lock(&mLock);
334    for (int i = 0; i < mMaxChannels; ++i) {
335        SoundChannel* channel = &mChannelPool[i];
336        channel->autoPause();
337    }
338}
339
340void SoundPool::resume(int channelID)
341{
342    LOGV("resume(%d)", channelID);
343    Mutex::Autolock lock(&mLock);
344    SoundChannel* channel = findChannel(channelID);
345    if (channel) {
346        channel->resume();
347    }
348}
349
350void SoundPool::autoResume()
351{
352    LOGV("autoResume()");
353    Mutex::Autolock lock(&mLock);
354    for (int i = 0; i < mMaxChannels; ++i) {
355        SoundChannel* channel = &mChannelPool[i];
356        channel->autoResume();
357    }
358}
359
360void SoundPool::stop(int channelID)
361{
362    LOGV("stop(%d)", channelID);
363    Mutex::Autolock lock(&mLock);
364    SoundChannel* channel = findChannel(channelID);
365    if (channel) {
366        channel->stop();
367    } else {
368        channel = findNextChannel(channelID);
369        if (channel)
370            channel->clearNextEvent();
371    }
372}
373
374void SoundPool::setVolume(int channelID, float leftVolume, float rightVolume)
375{
376    Mutex::Autolock lock(&mLock);
377    SoundChannel* channel = findChannel(channelID);
378    if (channel) {
379        channel->setVolume(leftVolume, rightVolume);
380    }
381}
382
383void SoundPool::setPriority(int channelID, int priority)
384{
385    LOGV("setPriority(%d, %d)", channelID, priority);
386    Mutex::Autolock lock(&mLock);
387    SoundChannel* channel = findChannel(channelID);
388    if (channel) {
389        channel->setPriority(priority);
390    }
391}
392
393void SoundPool::setLoop(int channelID, int loop)
394{
395    LOGV("setLoop(%d, %d)", channelID, loop);
396    Mutex::Autolock lock(&mLock);
397    SoundChannel* channel = findChannel(channelID);
398    if (channel) {
399        channel->setLoop(loop);
400    }
401}
402
403void SoundPool::setRate(int channelID, float rate)
404{
405    LOGV("setRate(%d, %f)", channelID, rate);
406    Mutex::Autolock lock(&mLock);
407    SoundChannel* channel = findChannel(channelID);
408    if (channel) {
409        channel->setRate(rate);
410    }
411}
412
413// call with lock held
414void SoundPool::done_l(SoundChannel* channel)
415{
416    LOGV("done_l(%d)", channel->channelID());
417    // if "stolen", play next event
418    if (channel->nextChannelID() != 0) {
419        LOGV("add to restart list");
420        addToRestartList(channel);
421    }
422
423    // return to idle state
424    else {
425        LOGV("move to front");
426        moveToFront_l(channel);
427    }
428}
429
430void SoundPool::setCallback(SoundPoolCallback* callback, void* user)
431{
432    Mutex::Autolock lock(&mCallbackLock);
433    mCallback = callback;
434    mUserData = user;
435}
436
437void SoundPool::notify(SoundPoolEvent event)
438{
439    Mutex::Autolock lock(&mCallbackLock);
440    if (mCallback != NULL) {
441        mCallback(event, this, mUserData);
442    }
443}
444
445void SoundPool::dump()
446{
447    for (int i = 0; i < mMaxChannels; ++i) {
448        mChannelPool[i].dump();
449    }
450}
451
452
453Sample::Sample(int sampleID, const char* url)
454{
455    init();
456    mSampleID = sampleID;
457    mUrl = strdup(url);
458    LOGV("create sampleID=%d, url=%s", mSampleID, mUrl);
459}
460
461Sample::Sample(int sampleID, int fd, int64_t offset, int64_t length)
462{
463    init();
464    mSampleID = sampleID;
465    mFd = dup(fd);
466    mOffset = offset;
467    mLength = length;
468    LOGV("create sampleID=%d, fd=%d, offset=%lld, length=%lld", mSampleID, mFd, mLength, mOffset);
469}
470
471void Sample::init()
472{
473    mData = 0;
474    mSize = 0;
475    mRefCount = 0;
476    mSampleID = 0;
477    mState = UNLOADED;
478    mFd = -1;
479    mOffset = 0;
480    mLength = 0;
481    mUrl = 0;
482}
483
484Sample::~Sample()
485{
486    LOGV("Sample::destructor sampleID=%d, fd=%d", mSampleID, mFd);
487    if (mFd > 0) {
488        LOGV("close(%d)", mFd);
489        ::close(mFd);
490    }
491    mData.clear();
492    delete mUrl;
493}
494
495status_t Sample::doLoad()
496{
497    uint32_t sampleRate;
498    int numChannels;
499    int format;
500    sp<IMemory> p;
501    LOGV("Start decode");
502    if (mUrl) {
503        p = MediaPlayer::decode(mUrl, &sampleRate, &numChannels, &format);
504    } else {
505        p = MediaPlayer::decode(mFd, mOffset, mLength, &sampleRate, &numChannels, &format);
506        LOGV("close(%d)", mFd);
507        ::close(mFd);
508        mFd = -1;
509    }
510    if (p == 0) {
511        LOGE("Unable to load sample: %s", mUrl);
512        return -1;
513    }
514    LOGV("pointer = %p, size = %u, sampleRate = %u, numChannels = %d",
515            p->pointer(), p->size(), sampleRate, numChannels);
516
517    if (sampleRate > kMaxSampleRate) {
518       LOGE("Sample rate (%u) out of range", sampleRate);
519       return - 1;
520    }
521
522    if ((numChannels < 1) || (numChannels > 2)) {
523        LOGE("Sample channel count (%d) out of range", numChannels);
524        return - 1;
525    }
526
527    //_dumpBuffer(p->pointer(), p->size());
528    uint8_t* q = static_cast<uint8_t*>(p->pointer()) + p->size() - 10;
529    //_dumpBuffer(q, 10, 10, false);
530
531    mData = p;
532    mSize = p->size();
533    mSampleRate = sampleRate;
534    mNumChannels = numChannels;
535    mFormat = format;
536    mState = READY;
537    return 0;
538}
539
540
541void SoundChannel::init(SoundPool* soundPool)
542{
543    mSoundPool = soundPool;
544}
545
546// call with sound pool lock held
547void SoundChannel::play(const sp<Sample>& sample, int nextChannelID, float leftVolume,
548        float rightVolume, int priority, int loop, float rate)
549{
550    AudioTrack* oldTrack;
551    AudioTrack* newTrack;
552    status_t status;
553
554    { // scope for the lock
555        Mutex::Autolock lock(&mLock);
556
557        LOGV("SoundChannel::play %p: sampleID=%d, channelID=%d, leftVolume=%f, rightVolume=%f,"
558                " priority=%d, loop=%d, rate=%f",
559                this, sample->sampleID(), nextChannelID, leftVolume, rightVolume,
560                priority, loop, rate);
561
562        // if not idle, this voice is being stolen
563        if (mState != IDLE) {
564            LOGV("channel %d stolen - event queued for channel %d", channelID(), nextChannelID);
565            mNextEvent.set(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
566            stop_l();
567            return;
568        }
569
570        // initialize track
571        int afFrameCount;
572        int afSampleRate;
573        int streamType = mSoundPool->streamType();
574        if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) {
575            afFrameCount = kDefaultFrameCount;
576        }
577        if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) {
578            afSampleRate = kDefaultSampleRate;
579        }
580        int numChannels = sample->numChannels();
581        uint32_t sampleRate = uint32_t(float(sample->sampleRate()) * rate + 0.5);
582        uint32_t totalFrames = (kDefaultBufferCount * afFrameCount * sampleRate) / afSampleRate;
583        uint32_t bufferFrames = (totalFrames + (kDefaultBufferCount - 1)) / kDefaultBufferCount;
584        uint32_t frameCount = 0;
585
586        if (loop) {
587            frameCount = sample->size()/numChannels/
588                ((sample->format() == AUDIO_FORMAT_PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
589        }
590
591#ifndef USE_SHARED_MEM_BUFFER
592        // Ensure minimum audio buffer size in case of short looped sample
593        if(frameCount < totalFrames) {
594            frameCount = totalFrames;
595        }
596#endif
597
598        // mToggle toggles each time a track is started on a given channel.
599        // The toggle is concatenated with the SoundChannel address and passed to AudioTrack
600        // as callback user data. This enables the detection of callbacks received from the old
601        // audio track while the new one is being started and avoids processing them with
602        // wrong audio audio buffer size  (mAudioBufferSize)
603        unsigned long toggle = mToggle ^ 1;
604        void *userData = (void *)((unsigned long)this | toggle);
605        uint32_t channels = (numChannels == 2) ?
606                AUDIO_CHANNEL_OUT_STEREO : AUDIO_CHANNEL_OUT_MONO;
607
608        // do not create a new audio track if current track is compatible with sample parameters
609#ifdef USE_SHARED_MEM_BUFFER
610        newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
611                channels, sample->getIMemory(), 0, callback, userData);
612#else
613        newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
614                channels, frameCount, 0, callback, userData, bufferFrames);
615#endif
616        oldTrack = mAudioTrack;
617        status = newTrack->initCheck();
618        if (status != NO_ERROR) {
619            LOGE("Error creating AudioTrack");
620            goto exit;
621        }
622        LOGV("setVolume %p", newTrack);
623        newTrack->setVolume(leftVolume, rightVolume);
624        newTrack->setLoop(0, frameCount, loop);
625
626        // From now on, AudioTrack callbacks recevieved with previous toggle value will be ignored.
627        mToggle = toggle;
628        mAudioTrack = newTrack;
629        mPos = 0;
630        mSample = sample;
631        mChannelID = nextChannelID;
632        mPriority = priority;
633        mLoop = loop;
634        mLeftVolume = leftVolume;
635        mRightVolume = rightVolume;
636        mNumChannels = numChannels;
637        mRate = rate;
638        clearNextEvent();
639        mState = PLAYING;
640        mAudioTrack->start();
641        mAudioBufferSize = newTrack->frameCount()*newTrack->frameSize();
642    }
643
644exit:
645    LOGV("delete oldTrack %p", oldTrack);
646    delete oldTrack;
647    if (status != NO_ERROR) {
648        delete newTrack;
649        mAudioTrack = NULL;
650    }
651}
652
653void SoundChannel::nextEvent()
654{
655    sp<Sample> sample;
656    int nextChannelID;
657    float leftVolume;
658    float rightVolume;
659    int priority;
660    int loop;
661    float rate;
662
663    // check for valid event
664    {
665        Mutex::Autolock lock(&mLock);
666        nextChannelID = mNextEvent.channelID();
667        if (nextChannelID  == 0) {
668            LOGV("stolen channel has no event");
669            return;
670        }
671
672        sample = mNextEvent.sample();
673        leftVolume = mNextEvent.leftVolume();
674        rightVolume = mNextEvent.rightVolume();
675        priority = mNextEvent.priority();
676        loop = mNextEvent.loop();
677        rate = mNextEvent.rate();
678    }
679
680    LOGV("Starting stolen channel %d -> %d", channelID(), nextChannelID);
681    play(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
682}
683
684void SoundChannel::callback(int event, void* user, void *info)
685{
686    SoundChannel* channel = static_cast<SoundChannel*>((void *)((unsigned long)user & ~1));
687
688    channel->process(event, info, (unsigned long)user & 1);
689}
690
691void SoundChannel::process(int event, void *info, unsigned long toggle)
692{
693    //LOGV("process(%d)", mChannelID);
694
695    Mutex::Autolock lock(&mLock);
696
697    AudioTrack::Buffer* b = NULL;
698    if (event == AudioTrack::EVENT_MORE_DATA) {
699       b = static_cast<AudioTrack::Buffer *>(info);
700    }
701
702    if (mToggle != toggle) {
703        LOGV("process wrong toggle %p channel %d", this, mChannelID);
704        if (b != NULL) {
705            b->size = 0;
706        }
707        return;
708    }
709
710    sp<Sample> sample = mSample;
711
712//    LOGV("SoundChannel::process event %d", event);
713
714    if (event == AudioTrack::EVENT_MORE_DATA) {
715
716        // check for stop state
717        if (b->size == 0) return;
718
719        if (mState == IDLE) {
720            b->size = 0;
721            return;
722        }
723
724        if (sample != 0) {
725            // fill buffer
726            uint8_t* q = (uint8_t*) b->i8;
727            size_t count = 0;
728
729            if (mPos < (int)sample->size()) {
730                uint8_t* p = sample->data() + mPos;
731                count = sample->size() - mPos;
732                if (count > b->size) {
733                    count = b->size;
734                }
735                memcpy(q, p, count);
736//              LOGV("fill: q=%p, p=%p, mPos=%u, b->size=%u, count=%d", q, p, mPos, b->size, count);
737            } else if (mPos < mAudioBufferSize) {
738                count = mAudioBufferSize - mPos;
739                if (count > b->size) {
740                    count = b->size;
741                }
742                memset(q, 0, count);
743//              LOGV("fill extra: q=%p, mPos=%u, b->size=%u, count=%d", q, mPos, b->size, count);
744            }
745
746            mPos += count;
747            b->size = count;
748            //LOGV("buffer=%p, [0]=%d", b->i16, b->i16[0]);
749        }
750    } else if (event == AudioTrack::EVENT_UNDERRUN) {
751        LOGV("process %p channel %d EVENT_UNDERRUN", this, mChannelID);
752        mSoundPool->addToStopList(this);
753    } else if (event == AudioTrack::EVENT_LOOP_END) {
754        LOGV("End loop %p channel %d count %d", this, mChannelID, *(int *)info);
755    }
756}
757
758
759// call with lock held
760bool SoundChannel::doStop_l()
761{
762    if (mState != IDLE) {
763        setVolume_l(0, 0);
764        LOGV("stop");
765        mAudioTrack->stop();
766        mSample.clear();
767        mState = IDLE;
768        mPriority = IDLE_PRIORITY;
769        return true;
770    }
771    return false;
772}
773
774// call with lock held and sound pool lock held
775void SoundChannel::stop_l()
776{
777    if (doStop_l()) {
778        mSoundPool->done_l(this);
779    }
780}
781
782// call with sound pool lock held
783void SoundChannel::stop()
784{
785    bool stopped;
786    {
787        Mutex::Autolock lock(&mLock);
788        stopped = doStop_l();
789    }
790
791    if (stopped) {
792        mSoundPool->done_l(this);
793    }
794}
795
796//FIXME: Pause is a little broken right now
797void SoundChannel::pause()
798{
799    Mutex::Autolock lock(&mLock);
800    if (mState == PLAYING) {
801        LOGV("pause track");
802        mState = PAUSED;
803        mAudioTrack->pause();
804    }
805}
806
807void SoundChannel::autoPause()
808{
809    Mutex::Autolock lock(&mLock);
810    if (mState == PLAYING) {
811        LOGV("pause track");
812        mState = PAUSED;
813        mAutoPaused = true;
814        mAudioTrack->pause();
815    }
816}
817
818void SoundChannel::resume()
819{
820    Mutex::Autolock lock(&mLock);
821    if (mState == PAUSED) {
822        LOGV("resume track");
823        mState = PLAYING;
824        mAutoPaused = false;
825        mAudioTrack->start();
826    }
827}
828
829void SoundChannel::autoResume()
830{
831    Mutex::Autolock lock(&mLock);
832    if (mAutoPaused && (mState == PAUSED)) {
833        LOGV("resume track");
834        mState = PLAYING;
835        mAutoPaused = false;
836        mAudioTrack->start();
837    }
838}
839
840void SoundChannel::setRate(float rate)
841{
842    Mutex::Autolock lock(&mLock);
843    if (mAudioTrack != 0 && mSample.get() != 0) {
844        uint32_t sampleRate = uint32_t(float(mSample->sampleRate()) * rate + 0.5);
845        mAudioTrack->setSampleRate(sampleRate);
846        mRate = rate;
847    }
848}
849
850// call with lock held
851void SoundChannel::setVolume_l(float leftVolume, float rightVolume)
852{
853    mLeftVolume = leftVolume;
854    mRightVolume = rightVolume;
855    if (mAudioTrack != 0) mAudioTrack->setVolume(leftVolume, rightVolume);
856}
857
858void SoundChannel::setVolume(float leftVolume, float rightVolume)
859{
860    Mutex::Autolock lock(&mLock);
861    setVolume_l(leftVolume, rightVolume);
862}
863
864void SoundChannel::setLoop(int loop)
865{
866    Mutex::Autolock lock(&mLock);
867    if (mAudioTrack != 0 && mSample.get() != 0) {
868        uint32_t loopEnd = mSample->size()/mNumChannels/
869            ((mSample->format() == AUDIO_FORMAT_PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
870        mAudioTrack->setLoop(0, loopEnd, loop);
871        mLoop = loop;
872    }
873}
874
875SoundChannel::~SoundChannel()
876{
877    LOGV("SoundChannel destructor %p", this);
878    {
879        Mutex::Autolock lock(&mLock);
880        clearNextEvent();
881        doStop_l();
882    }
883    // do not call AudioTrack destructor with mLock held as it will wait for the AudioTrack
884    // callback thread to exit which may need to execute process() and acquire the mLock.
885    delete mAudioTrack;
886}
887
888void SoundChannel::dump()
889{
890    LOGV("mState = %d mChannelID=%d, mNumChannels=%d, mPos = %d, mPriority=%d, mLoop=%d",
891            mState, mChannelID, mNumChannels, mPos, mPriority, mLoop);
892}
893
894void SoundEvent::set(const sp<Sample>& sample, int channelID, float leftVolume,
895            float rightVolume, int priority, int loop, float rate)
896{
897    mSample = sample;
898    mChannelID = channelID;
899    mLeftVolume = leftVolume;
900    mRightVolume = rightVolume;
901    mPriority = priority;
902    mLoop = loop;
903    mRate =rate;
904}
905
906} // end namespace android
907