SoundPool.cpp revision 8d0fda9660aee7059f802f400875247b01226084 
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#include <media/AudioTrack.h>
24#include <media/mediaplayer.h>
25#include <media/SoundPool.h>
26#include "SoundPoolThread.h"
27
28namespace android
29{
30
31int kDefaultBufferCount = 4;
32uint32_t kMaxSampleRate = 48000;
33uint32_t kDefaultSampleRate = 44100;
34uint32_t kDefaultFrameCount = 1200;
35
36SoundPool::SoundPool(int maxChannels, audio_stream_type_t streamType, int srcQuality)
37{
38    ALOGV("SoundPool constructor: maxChannels=%d, streamType=%d, srcQuality=%d",
39            maxChannels, streamType, srcQuality);
40
41    // check limits
42    mMaxChannels = maxChannels;
43    if (mMaxChannels < 1) {
44        mMaxChannels = 1;
45    }
46    else if (mMaxChannels > 32) {
47        mMaxChannels = 32;
48    }
49    ALOGW_IF(maxChannels != mMaxChannels, "App requested %d channels", maxChannels);
50
51    mQuit = false;
52    mDecodeThread = 0;
53    mStreamType = streamType;
54    mSrcQuality = srcQuality;
55    mAllocated = 0;
56    mNextSampleID = 0;
57    mNextChannelID = 0;
58
59    mCallback = 0;
60    mUserData = 0;
61
62    mChannelPool = new SoundChannel[mMaxChannels];
63    for (int i = 0; i < mMaxChannels; ++i) {
64        mChannelPool[i].init(this);
65        mChannels.push_back(&mChannelPool[i]);
66    }
67
68    // start decode thread
69    startThreads();
70}
71
72SoundPool::~SoundPool()
73{
74    ALOGV("SoundPool destructor");
75    mDecodeThread->quit();
76    quit();
77
78    Mutex::Autolock lock(&mLock);
79
80    mChannels.clear();
81    if (mChannelPool)
82        delete [] mChannelPool;
83    // clean up samples
84    ALOGV("clear samples");
85    mSamples.clear();
86
87    if (mDecodeThread)
88        delete mDecodeThread;
89}
90
91void SoundPool::addToRestartList(SoundChannel* channel)
92{
93    Mutex::Autolock lock(&mRestartLock);
94    if (!mQuit) {
95        mRestart.push_back(channel);
96        mCondition.signal();
97    }
98}
99
100void SoundPool::addToStopList(SoundChannel* channel)
101{
102    Mutex::Autolock lock(&mRestartLock);
103    if (!mQuit) {
104        mStop.push_back(channel);
105        mCondition.signal();
106    }
107}
108
109int SoundPool::beginThread(void* arg)
110{
111    SoundPool* p = (SoundPool*)arg;
112    return p->run();
113}
114
115int SoundPool::run()
116{
117    mRestartLock.lock();
118    while (!mQuit) {
119        mCondition.wait(mRestartLock);
120        ALOGV("awake");
121        if (mQuit) break;
122
123        while (!mStop.empty()) {
124            SoundChannel* channel;
125            ALOGV("Getting channel from stop list");
126            List<SoundChannel* >::iterator iter = mStop.begin();
127            channel = *iter;
128            mStop.erase(iter);
129            mRestartLock.unlock();
130            if (channel != 0) {
131                Mutex::Autolock lock(&mLock);
132                channel->stop();
133            }
134            mRestartLock.lock();
135            if (mQuit) break;
136        }
137
138        while (!mRestart.empty()) {
139            SoundChannel* channel;
140            ALOGV("Getting channel from list");
141            List<SoundChannel*>::iterator iter = mRestart.begin();
142            channel = *iter;
143            mRestart.erase(iter);
144            mRestartLock.unlock();
145            if (channel != 0) {
146                Mutex::Autolock lock(&mLock);
147                channel->nextEvent();
148            }
149            mRestartLock.lock();
150            if (mQuit) break;
151        }
152    }
153
154    mStop.clear();
155    mRestart.clear();
156    mCondition.signal();
157    mRestartLock.unlock();
158    ALOGV("goodbye");
159    return 0;
160}
161
162void SoundPool::quit()
163{
164    mRestartLock.lock();
165    mQuit = true;
166    mCondition.signal();
167    mCondition.wait(mRestartLock);
168    ALOGV("return from quit");
169    mRestartLock.unlock();
170}
171
172bool SoundPool::startThreads()
173{
174    createThreadEtc(beginThread, this, "SoundPool");
175    if (mDecodeThread == NULL)
176        mDecodeThread = new SoundPoolThread(this);
177    return mDecodeThread != NULL;
178}
179
180SoundChannel* SoundPool::findChannel(int channelID)
181{
182    for (int i = 0; i < mMaxChannels; ++i) {
183        if (mChannelPool[i].channelID() == channelID) {
184            return &mChannelPool[i];
185        }
186    }
187    return NULL;
188}
189
190SoundChannel* SoundPool::findNextChannel(int channelID)
191{
192    for (int i = 0; i < mMaxChannels; ++i) {
193        if (mChannelPool[i].nextChannelID() == channelID) {
194            return &mChannelPool[i];
195        }
196    }
197    return NULL;
198}
199
200int SoundPool::load(const char* path, int priority)
201{
202    ALOGV("load: path=%s, priority=%d", path, priority);
203    Mutex::Autolock lock(&mLock);
204    sp<Sample> sample = new Sample(++mNextSampleID, path);
205    mSamples.add(sample->sampleID(), sample);
206    doLoad(sample);
207    return sample->sampleID();
208}
209
210int SoundPool::load(int fd, int64_t offset, int64_t length, int priority)
211{
212    ALOGV("load: fd=%d, offset=%lld, length=%lld, priority=%d",
213            fd, offset, length, priority);
214    Mutex::Autolock lock(&mLock);
215    sp<Sample> sample = new Sample(++mNextSampleID, fd, offset, length);
216    mSamples.add(sample->sampleID(), sample);
217    doLoad(sample);
218    return sample->sampleID();
219}
220
221void SoundPool::doLoad(sp<Sample>& sample)
222{
223    ALOGV("doLoad: loading sample sampleID=%d", sample->sampleID());
224    sample->startLoad();
225    mDecodeThread->loadSample(sample->sampleID());
226}
227
228bool SoundPool::unload(int sampleID)
229{
230    ALOGV("unload: sampleID=%d", sampleID);
231    Mutex::Autolock lock(&mLock);
232    return mSamples.removeItem(sampleID);
233}
234
235int SoundPool::play(int sampleID, float leftVolume, float rightVolume,
236        int priority, int loop, float rate)
237{
238    ALOGV("play sampleID=%d, leftVolume=%f, rightVolume=%f, priority=%d, loop=%d, rate=%f",
239            sampleID, leftVolume, rightVolume, priority, loop, rate);
240    sp<Sample> sample;
241    SoundChannel* channel;
242    int channelID;
243
244    Mutex::Autolock lock(&mLock);
245
246    if (mQuit) {
247        return 0;
248    }
249    // is sample ready?
250    sample = findSample(sampleID);
251    if ((sample == 0) || (sample->state() != Sample::READY)) {
252        ALOGW("  sample %d not READY", sampleID);
253        return 0;
254    }
255
256    dump();
257
258    // allocate a channel
259    channel = allocateChannel_l(priority);
260
261    // no channel allocated - return 0
262    if (!channel) {
263        ALOGV("No channel allocated");
264        return 0;
265    }
266
267    channelID = ++mNextChannelID;
268
269    ALOGV("play channel %p state = %d", channel, channel->state());
270    channel->play(sample, channelID, leftVolume, rightVolume, priority, loop, rate);
271    return channelID;
272}
273
274SoundChannel* SoundPool::allocateChannel_l(int priority)
275{
276    List<SoundChannel*>::iterator iter;
277    SoundChannel* channel = NULL;
278
279    // allocate a channel
280    if (!mChannels.empty()) {
281        iter = mChannels.begin();
282        if (priority >= (*iter)->priority()) {
283            channel = *iter;
284            mChannels.erase(iter);
285            ALOGV("Allocated active channel");
286        }
287    }
288
289    // update priority and put it back in the list
290    if (channel) {
291        channel->setPriority(priority);
292        for (iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
293            if (priority < (*iter)->priority()) {
294                break;
295            }
296        }
297        mChannels.insert(iter, channel);
298    }
299    return channel;
300}
301
302// move a channel from its current position to the front of the list
303void SoundPool::moveToFront_l(SoundChannel* channel)
304{
305    for (List<SoundChannel*>::iterator iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
306        if (*iter == channel) {
307            mChannels.erase(iter);
308            mChannels.push_front(channel);
309            break;
310        }
311    }
312}
313
314void SoundPool::pause(int channelID)
315{
316    ALOGV("pause(%d)", channelID);
317    Mutex::Autolock lock(&mLock);
318    SoundChannel* channel = findChannel(channelID);
319    if (channel) {
320        channel->pause();
321    }
322}
323
324void SoundPool::autoPause()
325{
326    ALOGV("autoPause()");
327    Mutex::Autolock lock(&mLock);
328    for (int i = 0; i < mMaxChannels; ++i) {
329        SoundChannel* channel = &mChannelPool[i];
330        channel->autoPause();
331    }
332}
333
334void SoundPool::resume(int channelID)
335{
336    ALOGV("resume(%d)", channelID);
337    Mutex::Autolock lock(&mLock);
338    SoundChannel* channel = findChannel(channelID);
339    if (channel) {
340        channel->resume();
341    }
342}
343
344void SoundPool::autoResume()
345{
346    ALOGV("autoResume()");
347    Mutex::Autolock lock(&mLock);
348    for (int i = 0; i < mMaxChannels; ++i) {
349        SoundChannel* channel = &mChannelPool[i];
350        channel->autoResume();
351    }
352}
353
354void SoundPool::stop(int channelID)
355{
356    ALOGV("stop(%d)", channelID);
357    Mutex::Autolock lock(&mLock);
358    SoundChannel* channel = findChannel(channelID);
359    if (channel) {
360        channel->stop();
361    } else {
362        channel = findNextChannel(channelID);
363        if (channel)
364            channel->clearNextEvent();
365    }
366}
367
368void SoundPool::setVolume(int channelID, float leftVolume, float rightVolume)
369{
370    Mutex::Autolock lock(&mLock);
371    SoundChannel* channel = findChannel(channelID);
372    if (channel) {
373        channel->setVolume(leftVolume, rightVolume);
374    }
375}
376
377void SoundPool::setPriority(int channelID, int priority)
378{
379    ALOGV("setPriority(%d, %d)", channelID, priority);
380    Mutex::Autolock lock(&mLock);
381    SoundChannel* channel = findChannel(channelID);
382    if (channel) {
383        channel->setPriority(priority);
384    }
385}
386
387void SoundPool::setLoop(int channelID, int loop)
388{
389    ALOGV("setLoop(%d, %d)", channelID, loop);
390    Mutex::Autolock lock(&mLock);
391    SoundChannel* channel = findChannel(channelID);
392    if (channel) {
393        channel->setLoop(loop);
394    }
395}
396
397void SoundPool::setRate(int channelID, float rate)
398{
399    ALOGV("setRate(%d, %f)", channelID, rate);
400    Mutex::Autolock lock(&mLock);
401    SoundChannel* channel = findChannel(channelID);
402    if (channel) {
403        channel->setRate(rate);
404    }
405}
406
407// call with lock held
408void SoundPool::done_l(SoundChannel* channel)
409{
410    ALOGV("done_l(%d)", channel->channelID());
411    // if "stolen", play next event
412    if (channel->nextChannelID() != 0) {
413        ALOGV("add to restart list");
414        addToRestartList(channel);
415    }
416
417    // return to idle state
418    else {
419        ALOGV("move to front");
420        moveToFront_l(channel);
421    }
422}
423
424void SoundPool::setCallback(SoundPoolCallback* callback, void* user)
425{
426    Mutex::Autolock lock(&mCallbackLock);
427    mCallback = callback;
428    mUserData = user;
429}
430
431void SoundPool::notify(SoundPoolEvent event)
432{
433    Mutex::Autolock lock(&mCallbackLock);
434    if (mCallback != NULL) {
435        mCallback(event, this, mUserData);
436    }
437}
438
439void SoundPool::dump()
440{
441    for (int i = 0; i < mMaxChannels; ++i) {
442        mChannelPool[i].dump();
443    }
444}
445
446
447Sample::Sample(int sampleID, const char* url)
448{
449    init();
450    mSampleID = sampleID;
451    mUrl = strdup(url);
452    ALOGV("create sampleID=%d, url=%s", mSampleID, mUrl);
453}
454
455Sample::Sample(int sampleID, int fd, int64_t offset, int64_t length)
456{
457    init();
458    mSampleID = sampleID;
459    mFd = dup(fd);
460    mOffset = offset;
461    mLength = length;
462    ALOGV("create sampleID=%d, fd=%d, offset=%lld, length=%lld", mSampleID, mFd, mLength, mOffset);
463}
464
465void Sample::init()
466{
467    mData = 0;
468    mSize = 0;
469    mRefCount = 0;
470    mSampleID = 0;
471    mState = UNLOADED;
472    mFd = -1;
473    mOffset = 0;
474    mLength = 0;
475    mUrl = 0;
476}
477
478Sample::~Sample()
479{
480    ALOGV("Sample::destructor sampleID=%d, fd=%d", mSampleID, mFd);
481    if (mFd > 0) {
482        ALOGV("close(%d)", mFd);
483        ::close(mFd);
484    }
485    mData.clear();
486    free(mUrl);
487}
488
489status_t Sample::doLoad()
490{
491    uint32_t sampleRate;
492    int numChannels;
493    audio_format_t format;
494    sp<IMemory> p;
495    ALOGV("Start decode");
496    if (mUrl) {
497        p = MediaPlayer::decode(mUrl, &sampleRate, &numChannels, &format);
498    } else {
499        p = MediaPlayer::decode(mFd, mOffset, mLength, &sampleRate, &numChannels, &format);
500        ALOGV("close(%d)", mFd);
501        ::close(mFd);
502        mFd = -1;
503    }
504    if (p == 0) {
505        ALOGE("Unable to load sample: %s", mUrl);
506        return -1;
507    }
508    ALOGV("pointer = %p, size = %u, sampleRate = %u, numChannels = %d",
509            p->pointer(), p->size(), sampleRate, numChannels);
510
511    if (sampleRate > kMaxSampleRate) {
512       ALOGE("Sample rate (%u) out of range", sampleRate);
513       return - 1;
514    }
515
516    if ((numChannels < 1) || (numChannels > 2)) {
517        ALOGE("Sample channel count (%d) out of range", numChannels);
518        return - 1;
519    }
520
521    //_dumpBuffer(p->pointer(), p->size());
522    uint8_t* q = static_cast<uint8_t*>(p->pointer()) + p->size() - 10;
523    //_dumpBuffer(q, 10, 10, false);
524
525    mData = p;
526    mSize = p->size();
527    mSampleRate = sampleRate;
528    mNumChannels = numChannels;
529    mFormat = format;
530    mState = READY;
531    return 0;
532}
533
534
535void SoundChannel::init(SoundPool* soundPool)
536{
537    mSoundPool = soundPool;
538}
539
540// call with sound pool lock held
541void SoundChannel::play(const sp<Sample>& sample, int nextChannelID, float leftVolume,
542        float rightVolume, int priority, int loop, float rate)
543{
544    sp<AudioTrack> oldTrack;
545    sp<AudioTrack> newTrack;
546    status_t status;
547
548    { // scope for the lock
549        Mutex::Autolock lock(&mLock);
550
551        ALOGV("SoundChannel::play %p: sampleID=%d, channelID=%d, leftVolume=%f, rightVolume=%f,"
552                " priority=%d, loop=%d, rate=%f",
553                this, sample->sampleID(), nextChannelID, leftVolume, rightVolume,
554                priority, loop, rate);
555
556        // if not idle, this voice is being stolen
557        if (mState != IDLE) {
558            ALOGV("channel %d stolen - event queued for channel %d", channelID(), nextChannelID);
559            mNextEvent.set(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
560            stop_l();
561            return;
562        }
563
564        // initialize track
565        size_t afFrameCount;
566        uint32_t afSampleRate;
567        audio_stream_type_t streamType = mSoundPool->streamType();
568        if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) {
569            afFrameCount = kDefaultFrameCount;
570        }
571        if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) {
572            afSampleRate = kDefaultSampleRate;
573        }
574        int numChannels = sample->numChannels();
575        uint32_t sampleRate = uint32_t(float(sample->sampleRate()) * rate + 0.5);
576        uint32_t totalFrames = (kDefaultBufferCount * afFrameCount * sampleRate) / afSampleRate;
577        uint32_t bufferFrames = (totalFrames + (kDefaultBufferCount - 1)) / kDefaultBufferCount;
578        uint32_t frameCount = 0;
579
580        if (loop) {
581            frameCount = sample->size()/numChannels/
582                ((sample->format() == AUDIO_FORMAT_PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
583        }
584
585#ifndef USE_SHARED_MEM_BUFFER
586        // Ensure minimum audio buffer size in case of short looped sample
587        if(frameCount < totalFrames) {
588            frameCount = totalFrames;
589        }
590#endif
591
592        // mToggle toggles each time a track is started on a given channel.
593        // The toggle is concatenated with the SoundChannel address and passed to AudioTrack
594        // as callback user data. This enables the detection of callbacks received from the old
595        // audio track while the new one is being started and avoids processing them with
596        // wrong audio audio buffer size  (mAudioBufferSize)
597        unsigned long toggle = mToggle ^ 1;
598        void *userData = (void *)((unsigned long)this | toggle);
599        uint32_t channels = (numChannels == 2) ?
600                AUDIO_CHANNEL_OUT_STEREO : AUDIO_CHANNEL_OUT_MONO;
601
602        // do not create a new audio track if current track is compatible with sample parameters
603#ifdef USE_SHARED_MEM_BUFFER
604        newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
605                channels, sample->getIMemory(), AUDIO_OUTPUT_FLAG_FAST, callback, userData);
606#else
607        newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
608                channels, frameCount, AUDIO_OUTPUT_FLAG_FAST, callback, userData,
609                bufferFrames);
610#endif
611        oldTrack = mAudioTrack;
612        status = newTrack->initCheck();
613        if (status != NO_ERROR) {
614            ALOGE("Error creating AudioTrack");
615            goto exit;
616        }
617        ALOGV("setVolume %p", newTrack.get());
618        newTrack->setVolume(leftVolume, rightVolume);
619        newTrack->setLoop(0, frameCount, loop);
620
621        // From now on, AudioTrack callbacks received with previous toggle value will be ignored.
622        mToggle = toggle;
623        mAudioTrack = newTrack;
624        mPos = 0;
625        mSample = sample;
626        mChannelID = nextChannelID;
627        mPriority = priority;
628        mLoop = loop;
629        mLeftVolume = leftVolume;
630        mRightVolume = rightVolume;
631        mNumChannels = numChannels;
632        mRate = rate;
633        clearNextEvent();
634        mState = PLAYING;
635        mAudioTrack->start();
636        mAudioBufferSize = newTrack->frameCount()*newTrack->frameSize();
637    }
638
639exit:
640    ALOGV("delete oldTrack %p", oldTrack.get());
641    if (status != NO_ERROR) {
642        mAudioTrack.clear();
643    }
644}
645
646void SoundChannel::nextEvent()
647{
648    sp<Sample> sample;
649    int nextChannelID;
650    float leftVolume;
651    float rightVolume;
652    int priority;
653    int loop;
654    float rate;
655
656    // check for valid event
657    {
658        Mutex::Autolock lock(&mLock);
659        nextChannelID = mNextEvent.channelID();
660        if (nextChannelID  == 0) {
661            ALOGV("stolen channel has no event");
662            return;
663        }
664
665        sample = mNextEvent.sample();
666        leftVolume = mNextEvent.leftVolume();
667        rightVolume = mNextEvent.rightVolume();
668        priority = mNextEvent.priority();
669        loop = mNextEvent.loop();
670        rate = mNextEvent.rate();
671    }
672
673    ALOGV("Starting stolen channel %d -> %d", channelID(), nextChannelID);
674    play(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
675}
676
677void SoundChannel::callback(int event, void* user, void *info)
678{
679    SoundChannel* channel = static_cast<SoundChannel*>((void *)((unsigned long)user & ~1));
680
681    channel->process(event, info, (unsigned long)user & 1);
682}
683
684void SoundChannel::process(int event, void *info, unsigned long toggle)
685{
686    //ALOGV("process(%d)", mChannelID);
687
688    Mutex::Autolock lock(&mLock);
689
690    AudioTrack::Buffer* b = NULL;
691    if (event == AudioTrack::EVENT_MORE_DATA) {
692       b = static_cast<AudioTrack::Buffer *>(info);
693    }
694
695    if (mToggle != toggle) {
696        ALOGV("process wrong toggle %p channel %d", this, mChannelID);
697        if (b != NULL) {
698            b->size = 0;
699        }
700        return;
701    }
702
703    sp<Sample> sample = mSample;
704
705//    ALOGV("SoundChannel::process event %d", event);
706
707    if (event == AudioTrack::EVENT_MORE_DATA) {
708
709        // check for stop state
710        if (b->size == 0) return;
711
712        if (mState == IDLE) {
713            b->size = 0;
714            return;
715        }
716
717        if (sample != 0) {
718            // fill buffer
719            uint8_t* q = (uint8_t*) b->i8;
720            size_t count = 0;
721
722            if (mPos < (int)sample->size()) {
723                uint8_t* p = sample->data() + mPos;
724                count = sample->size() - mPos;
725                if (count > b->size) {
726                    count = b->size;
727                }
728                memcpy(q, p, count);
729//              ALOGV("fill: q=%p, p=%p, mPos=%u, b->size=%u, count=%d", q, p, mPos, b->size, count);
730            } else if (mPos < mAudioBufferSize) {
731                count = mAudioBufferSize - mPos;
732                if (count > b->size) {
733                    count = b->size;
734                }
735                memset(q, 0, count);
736//              ALOGV("fill extra: q=%p, mPos=%u, b->size=%u, count=%d", q, mPos, b->size, count);
737            }
738
739            mPos += count;
740            b->size = count;
741            //ALOGV("buffer=%p, [0]=%d", b->i16, b->i16[0]);
742        }
743    } else if (event == AudioTrack::EVENT_UNDERRUN || event == AudioTrack::EVENT_BUFFER_END) {
744        ALOGV("process %p channel %d EVENT_UNDERRUN or EVENT_BUFFER_END", this, mChannelID);
745        mSoundPool->addToStopList(this);
746    } else if (event == AudioTrack::EVENT_LOOP_END) {
747        ALOGV("End loop %p channel %d count %d", this, mChannelID, *(int *)info);
748    }
749}
750
751
752// call with lock held
753bool SoundChannel::doStop_l()
754{
755    if (mState != IDLE) {
756        setVolume_l(0, 0);
757        ALOGV("stop");
758        mAudioTrack->stop();
759        mSample.clear();
760        mState = IDLE;
761        mPriority = IDLE_PRIORITY;
762        return true;
763    }
764    return false;
765}
766
767// call with lock held and sound pool lock held
768void SoundChannel::stop_l()
769{
770    if (doStop_l()) {
771        mSoundPool->done_l(this);
772    }
773}
774
775// call with sound pool lock held
776void SoundChannel::stop()
777{
778    bool stopped;
779    {
780        Mutex::Autolock lock(&mLock);
781        stopped = doStop_l();
782    }
783
784    if (stopped) {
785        mSoundPool->done_l(this);
786    }
787}
788
789//FIXME: Pause is a little broken right now
790void SoundChannel::pause()
791{
792    Mutex::Autolock lock(&mLock);
793    if (mState == PLAYING) {
794        ALOGV("pause track");
795        mState = PAUSED;
796        mAudioTrack->pause();
797    }
798}
799
800void SoundChannel::autoPause()
801{
802    Mutex::Autolock lock(&mLock);
803    if (mState == PLAYING) {
804        ALOGV("pause track");
805        mState = PAUSED;
806        mAutoPaused = true;
807        mAudioTrack->pause();
808    }
809}
810
811void SoundChannel::resume()
812{
813    Mutex::Autolock lock(&mLock);
814    if (mState == PAUSED) {
815        ALOGV("resume track");
816        mState = PLAYING;
817        mAutoPaused = false;
818        mAudioTrack->start();
819    }
820}
821
822void SoundChannel::autoResume()
823{
824    Mutex::Autolock lock(&mLock);
825    if (mAutoPaused && (mState == PAUSED)) {
826        ALOGV("resume track");
827        mState = PLAYING;
828        mAutoPaused = false;
829        mAudioTrack->start();
830    }
831}
832
833void SoundChannel::setRate(float rate)
834{
835    Mutex::Autolock lock(&mLock);
836    if (mAudioTrack != NULL && mSample != 0) {
837        uint32_t sampleRate = uint32_t(float(mSample->sampleRate()) * rate + 0.5);
838        mAudioTrack->setSampleRate(sampleRate);
839        mRate = rate;
840    }
841}
842
843// call with lock held
844void SoundChannel::setVolume_l(float leftVolume, float rightVolume)
845{
846    mLeftVolume = leftVolume;
847    mRightVolume = rightVolume;
848    if (mAudioTrack != NULL)
849        mAudioTrack->setVolume(leftVolume, rightVolume);
850}
851
852void SoundChannel::setVolume(float leftVolume, float rightVolume)
853{
854    Mutex::Autolock lock(&mLock);
855    setVolume_l(leftVolume, rightVolume);
856}
857
858void SoundChannel::setLoop(int loop)
859{
860    Mutex::Autolock lock(&mLock);
861    if (mAudioTrack != NULL && mSample != 0) {
862        uint32_t loopEnd = mSample->size()/mNumChannels/
863            ((mSample->format() == AUDIO_FORMAT_PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
864        mAudioTrack->setLoop(0, loopEnd, loop);
865        mLoop = loop;
866    }
867}
868
869SoundChannel::~SoundChannel()
870{
871    ALOGV("SoundChannel destructor %p", this);
872    {
873        Mutex::Autolock lock(&mLock);
874        clearNextEvent();
875        doStop_l();
876    }
877    // do not call AudioTrack destructor with mLock held as it will wait for the AudioTrack
878    // callback thread to exit which may need to execute process() and acquire the mLock.
879    mAudioTrack.clear();
880}
881
882void SoundChannel::dump()
883{
884    ALOGV("mState = %d mChannelID=%d, mNumChannels=%d, mPos = %d, mPriority=%d, mLoop=%d",
885            mState, mChannelID, mNumChannels, mPos, mPriority, mLoop);
886}
887
888void SoundEvent::set(const sp<Sample>& sample, int channelID, float leftVolume,
889            float rightVolume, int priority, int loop, float rate)
890{
891    mSample = sample;
892    mChannelID = channelID;
893    mLeftVolume = leftVolume;
894    mRightVolume = rightVolume;
895    mPriority = priority;
896    mLoop = loop;
897    mRate =rate;
898}
899
900} // end namespace android
901