SoundPool.cpp revision 1477e92867a950016579a644e74f803ed1d90cbb 
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 <media/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, audio_stream_type_t streamType, int srcQuality)
43{
44    ALOGV("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    ALOGW_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    ALOGV("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    ALOGV("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        ALOGV("awake");
127        if (mQuit) break;
128
129        while (!mStop.empty()) {
130            SoundChannel* channel;
131            ALOGV("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            ALOGV("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    ALOGV("goodbye");
165    return 0;
166}
167
168void SoundPool::quit()
169{
170    mRestartLock.lock();
171    mQuit = true;
172    mCondition.signal();
173    mCondition.wait(mRestartLock);
174    ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("doLoad: loading sample sampleID=%d", sample->sampleID());
230    sample->startLoad();
231    mDecodeThread->loadSample(sample->sampleID());
232}
233
234bool SoundPool::unload(int sampleID)
235{
236    ALOGV("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    ALOGV("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        ALOGW("  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        ALOGV("No channel allocated");
270        return 0;
271    }
272
273    channelID = ++mNextChannelID;
274
275    ALOGV("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            ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("done_l(%d)", channel->channelID());
417    // if "stolen", play next event
418    if (channel->nextChannelID() != 0) {
419        ALOGV("add to restart list");
420        addToRestartList(channel);
421    }
422
423    // return to idle state
424    else {
425        ALOGV("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    ALOGV("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    ALOGV("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    ALOGV("Sample::destructor sampleID=%d, fd=%d", mSampleID, mFd);
487    if (mFd > 0) {
488        ALOGV("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    audio_format_t format;
500    sp<IMemory> p;
501    ALOGV("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        ALOGV("close(%d)", mFd);
507        ::close(mFd);
508        mFd = -1;
509    }
510    if (p == 0) {
511        ALOGE("Unable to load sample: %s", mUrl);
512        return -1;
513    }
514    ALOGV("pointer = %p, size = %u, sampleRate = %u, numChannels = %d",
515            p->pointer(), p->size(), sampleRate, numChannels);
516
517    if (sampleRate > kMaxSampleRate) {
518       ALOGE("Sample rate (%u) out of range", sampleRate);
519       return - 1;
520    }
521
522    if ((numChannels < 1) || (numChannels > 2)) {
523        ALOGE("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        ALOGV("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            ALOGV("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        audio_stream_type_t 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(), AUDIO_OUTPUT_FLAG_NONE, callback, userData);
612#else
613        newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
614                channels, frameCount, AUDIO_OUTPUT_FLAG_FAST, callback, userData,
615                bufferFrames);
616#endif
617        oldTrack = mAudioTrack;
618        status = newTrack->initCheck();
619        if (status != NO_ERROR) {
620            ALOGE("Error creating AudioTrack");
621            goto exit;
622        }
623        ALOGV("setVolume %p", newTrack);
624        newTrack->setVolume(leftVolume, rightVolume);
625        newTrack->setLoop(0, frameCount, loop);
626
627        // From now on, AudioTrack callbacks received with previous toggle value will be ignored.
628        mToggle = toggle;
629        mAudioTrack = newTrack;
630        mPos = 0;
631        mSample = sample;
632        mChannelID = nextChannelID;
633        mPriority = priority;
634        mLoop = loop;
635        mLeftVolume = leftVolume;
636        mRightVolume = rightVolume;
637        mNumChannels = numChannels;
638        mRate = rate;
639        clearNextEvent();
640        mState = PLAYING;
641        mAudioTrack->start();
642        mAudioBufferSize = newTrack->frameCount()*newTrack->frameSize();
643    }
644
645exit:
646    ALOGV("delete oldTrack %p", oldTrack);
647    delete oldTrack;
648    if (status != NO_ERROR) {
649        delete newTrack;
650        mAudioTrack = NULL;
651    }
652}
653
654void SoundChannel::nextEvent()
655{
656    sp<Sample> sample;
657    int nextChannelID;
658    float leftVolume;
659    float rightVolume;
660    int priority;
661    int loop;
662    float rate;
663
664    // check for valid event
665    {
666        Mutex::Autolock lock(&mLock);
667        nextChannelID = mNextEvent.channelID();
668        if (nextChannelID  == 0) {
669            ALOGV("stolen channel has no event");
670            return;
671        }
672
673        sample = mNextEvent.sample();
674        leftVolume = mNextEvent.leftVolume();
675        rightVolume = mNextEvent.rightVolume();
676        priority = mNextEvent.priority();
677        loop = mNextEvent.loop();
678        rate = mNextEvent.rate();
679    }
680
681    ALOGV("Starting stolen channel %d -> %d", channelID(), nextChannelID);
682    play(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
683}
684
685void SoundChannel::callback(int event, void* user, void *info)
686{
687    SoundChannel* channel = static_cast<SoundChannel*>((void *)((unsigned long)user & ~1));
688
689    channel->process(event, info, (unsigned long)user & 1);
690}
691
692void SoundChannel::process(int event, void *info, unsigned long toggle)
693{
694    //ALOGV("process(%d)", mChannelID);
695
696    Mutex::Autolock lock(&mLock);
697
698    AudioTrack::Buffer* b = NULL;
699    if (event == AudioTrack::EVENT_MORE_DATA) {
700       b = static_cast<AudioTrack::Buffer *>(info);
701    }
702
703    if (mToggle != toggle) {
704        ALOGV("process wrong toggle %p channel %d", this, mChannelID);
705        if (b != NULL) {
706            b->size = 0;
707        }
708        return;
709    }
710
711    sp<Sample> sample = mSample;
712
713//    ALOGV("SoundChannel::process event %d", event);
714
715    if (event == AudioTrack::EVENT_MORE_DATA) {
716
717        // check for stop state
718        if (b->size == 0) return;
719
720        if (mState == IDLE) {
721            b->size = 0;
722            return;
723        }
724
725        if (sample != 0) {
726            // fill buffer
727            uint8_t* q = (uint8_t*) b->i8;
728            size_t count = 0;
729
730            if (mPos < (int)sample->size()) {
731                uint8_t* p = sample->data() + mPos;
732                count = sample->size() - mPos;
733                if (count > b->size) {
734                    count = b->size;
735                }
736                memcpy(q, p, count);
737//              ALOGV("fill: q=%p, p=%p, mPos=%u, b->size=%u, count=%d", q, p, mPos, b->size, count);
738            } else if (mPos < mAudioBufferSize) {
739                count = mAudioBufferSize - mPos;
740                if (count > b->size) {
741                    count = b->size;
742                }
743                memset(q, 0, count);
744//              ALOGV("fill extra: q=%p, mPos=%u, b->size=%u, count=%d", q, mPos, b->size, count);
745            }
746
747            mPos += count;
748            b->size = count;
749            //ALOGV("buffer=%p, [0]=%d", b->i16, b->i16[0]);
750        }
751    } else if (event == AudioTrack::EVENT_UNDERRUN) {
752        ALOGV("process %p channel %d EVENT_UNDERRUN", this, mChannelID);
753        mSoundPool->addToStopList(this);
754    } else if (event == AudioTrack::EVENT_LOOP_END) {
755        ALOGV("End loop %p channel %d count %d", this, mChannelID, *(int *)info);
756    }
757}
758
759
760// call with lock held
761bool SoundChannel::doStop_l()
762{
763    if (mState != IDLE) {
764        setVolume_l(0, 0);
765        ALOGV("stop");
766        mAudioTrack->stop();
767        mSample.clear();
768        mState = IDLE;
769        mPriority = IDLE_PRIORITY;
770        return true;
771    }
772    return false;
773}
774
775// call with lock held and sound pool lock held
776void SoundChannel::stop_l()
777{
778    if (doStop_l()) {
779        mSoundPool->done_l(this);
780    }
781}
782
783// call with sound pool lock held
784void SoundChannel::stop()
785{
786    bool stopped;
787    {
788        Mutex::Autolock lock(&mLock);
789        stopped = doStop_l();
790    }
791
792    if (stopped) {
793        mSoundPool->done_l(this);
794    }
795}
796
797//FIXME: Pause is a little broken right now
798void SoundChannel::pause()
799{
800    Mutex::Autolock lock(&mLock);
801    if (mState == PLAYING) {
802        ALOGV("pause track");
803        mState = PAUSED;
804        mAudioTrack->pause();
805    }
806}
807
808void SoundChannel::autoPause()
809{
810    Mutex::Autolock lock(&mLock);
811    if (mState == PLAYING) {
812        ALOGV("pause track");
813        mState = PAUSED;
814        mAutoPaused = true;
815        mAudioTrack->pause();
816    }
817}
818
819void SoundChannel::resume()
820{
821    Mutex::Autolock lock(&mLock);
822    if (mState == PAUSED) {
823        ALOGV("resume track");
824        mState = PLAYING;
825        mAutoPaused = false;
826        mAudioTrack->start();
827    }
828}
829
830void SoundChannel::autoResume()
831{
832    Mutex::Autolock lock(&mLock);
833    if (mAutoPaused && (mState == PAUSED)) {
834        ALOGV("resume track");
835        mState = PLAYING;
836        mAutoPaused = false;
837        mAudioTrack->start();
838    }
839}
840
841void SoundChannel::setRate(float rate)
842{
843    Mutex::Autolock lock(&mLock);
844    if (mAudioTrack != NULL && mSample != 0) {
845        uint32_t sampleRate = uint32_t(float(mSample->sampleRate()) * rate + 0.5);
846        mAudioTrack->setSampleRate(sampleRate);
847        mRate = rate;
848    }
849}
850
851// call with lock held
852void SoundChannel::setVolume_l(float leftVolume, float rightVolume)
853{
854    mLeftVolume = leftVolume;
855    mRightVolume = rightVolume;
856    if (mAudioTrack != NULL)
857        mAudioTrack->setVolume(leftVolume, rightVolume);
858}
859
860void SoundChannel::setVolume(float leftVolume, float rightVolume)
861{
862    Mutex::Autolock lock(&mLock);
863    setVolume_l(leftVolume, rightVolume);
864}
865
866void SoundChannel::setLoop(int loop)
867{
868    Mutex::Autolock lock(&mLock);
869    if (mAudioTrack != NULL && mSample != 0) {
870        uint32_t loopEnd = mSample->size()/mNumChannels/
871            ((mSample->format() == AUDIO_FORMAT_PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
872        mAudioTrack->setLoop(0, loopEnd, loop);
873        mLoop = loop;
874    }
875}
876
877SoundChannel::~SoundChannel()
878{
879    ALOGV("SoundChannel destructor %p", this);
880    {
881        Mutex::Autolock lock(&mLock);
882        clearNextEvent();
883        doStop_l();
884    }
885    // do not call AudioTrack destructor with mLock held as it will wait for the AudioTrack
886    // callback thread to exit which may need to execute process() and acquire the mLock.
887    delete mAudioTrack;
888}
889
890void SoundChannel::dump()
891{
892    ALOGV("mState = %d mChannelID=%d, mNumChannels=%d, mPos = %d, mPriority=%d, mLoop=%d",
893            mState, mChannelID, mNumChannels, mPos, mPriority, mLoop);
894}
895
896void SoundEvent::set(const sp<Sample>& sample, int channelID, float leftVolume,
897            float rightVolume, int priority, int loop, float rate)
898{
899    mSample = sample;
900    mChannelID = channelID;
901    mLeftVolume = leftVolume;
902    mRightVolume = rightVolume;
903    mPriority = priority;
904    mLoop = loop;
905    mRate =rate;
906}
907
908} // end namespace android
909