SoundPool.cpp revision 0c4b81bd3ef3fd5eb0f7d1b8e2c6168b95020134 
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
20#include <inttypes.h>
21
22#include <utils/Log.h>
23
24#define USE_SHARED_MEM_BUFFER
25
26#include <media/AudioTrack.h>
27#include <media/IMediaHTTPService.h>
28#include <media/mediaplayer.h>
29#include <media/stagefright/MediaExtractor.h>
30#include "SoundPool.h"
31#include "SoundPoolThread.h"
32#include <media/AudioPolicyHelper.h>
33#include <ndk/NdkMediaCodec.h>
34#include <ndk/NdkMediaExtractor.h>
35#include <ndk/NdkMediaFormat.h>
36
37namespace android
38{
39
40int kDefaultBufferCount = 4;
41uint32_t kMaxSampleRate = 48000;
42uint32_t kDefaultSampleRate = 44100;
43uint32_t kDefaultFrameCount = 1200;
44size_t kDefaultHeapSize = 1024 * 1024; // 1MB
45
46
47SoundPool::SoundPool(int maxChannels, const audio_attributes_t* pAttributes)
48{
49    ALOGV("SoundPool constructor: maxChannels=%d, attr.usage=%d, attr.flags=0x%x, attr.tags=%s",
50            maxChannels, pAttributes->usage, pAttributes->flags, pAttributes->tags);
51
52    // check limits
53    mMaxChannels = maxChannels;
54    if (mMaxChannels < 1) {
55        mMaxChannels = 1;
56    }
57    else if (mMaxChannels > 32) {
58        mMaxChannels = 32;
59    }
60    ALOGW_IF(maxChannels != mMaxChannels, "App requested %d channels", maxChannels);
61
62    mQuit = false;
63    mDecodeThread = 0;
64    memcpy(&mAttributes, pAttributes, sizeof(audio_attributes_t));
65    mAllocated = 0;
66    mNextSampleID = 0;
67    mNextChannelID = 0;
68
69    mCallback = 0;
70    mUserData = 0;
71
72    mChannelPool = new SoundChannel[mMaxChannels];
73    for (int i = 0; i < mMaxChannels; ++i) {
74        mChannelPool[i].init(this);
75        mChannels.push_back(&mChannelPool[i]);
76    }
77
78    // start decode thread
79    startThreads();
80}
81
82SoundPool::~SoundPool()
83{
84    ALOGV("SoundPool destructor");
85    mDecodeThread->quit();
86    quit();
87
88    Mutex::Autolock lock(&mLock);
89
90    mChannels.clear();
91    if (mChannelPool)
92        delete [] mChannelPool;
93    // clean up samples
94    ALOGV("clear samples");
95    mSamples.clear();
96
97    if (mDecodeThread)
98        delete mDecodeThread;
99}
100
101void SoundPool::addToRestartList(SoundChannel* channel)
102{
103    Mutex::Autolock lock(&mRestartLock);
104    if (!mQuit) {
105        mRestart.push_back(channel);
106        mCondition.signal();
107    }
108}
109
110void SoundPool::addToStopList(SoundChannel* channel)
111{
112    Mutex::Autolock lock(&mRestartLock);
113    if (!mQuit) {
114        mStop.push_back(channel);
115        mCondition.signal();
116    }
117}
118
119int SoundPool::beginThread(void* arg)
120{
121    SoundPool* p = (SoundPool*)arg;
122    return p->run();
123}
124
125int SoundPool::run()
126{
127    mRestartLock.lock();
128    while (!mQuit) {
129        mCondition.wait(mRestartLock);
130        ALOGV("awake");
131        if (mQuit) break;
132
133        while (!mStop.empty()) {
134            SoundChannel* channel;
135            ALOGV("Getting channel from stop list");
136            List<SoundChannel* >::iterator iter = mStop.begin();
137            channel = *iter;
138            mStop.erase(iter);
139            mRestartLock.unlock();
140            if (channel != 0) {
141                Mutex::Autolock lock(&mLock);
142                channel->stop();
143            }
144            mRestartLock.lock();
145            if (mQuit) break;
146        }
147
148        while (!mRestart.empty()) {
149            SoundChannel* channel;
150            ALOGV("Getting channel from list");
151            List<SoundChannel*>::iterator iter = mRestart.begin();
152            channel = *iter;
153            mRestart.erase(iter);
154            mRestartLock.unlock();
155            if (channel != 0) {
156                Mutex::Autolock lock(&mLock);
157                channel->nextEvent();
158            }
159            mRestartLock.lock();
160            if (mQuit) break;
161        }
162    }
163
164    mStop.clear();
165    mRestart.clear();
166    mCondition.signal();
167    mRestartLock.unlock();
168    ALOGV("goodbye");
169    return 0;
170}
171
172void SoundPool::quit()
173{
174    mRestartLock.lock();
175    mQuit = true;
176    mCondition.signal();
177    mCondition.wait(mRestartLock);
178    ALOGV("return from quit");
179    mRestartLock.unlock();
180}
181
182bool SoundPool::startThreads()
183{
184    createThreadEtc(beginThread, this, "SoundPool");
185    if (mDecodeThread == NULL)
186        mDecodeThread = new SoundPoolThread(this);
187    return mDecodeThread != NULL;
188}
189
190SoundChannel* SoundPool::findChannel(int channelID)
191{
192    for (int i = 0; i < mMaxChannels; ++i) {
193        if (mChannelPool[i].channelID() == channelID) {
194            return &mChannelPool[i];
195        }
196    }
197    return NULL;
198}
199
200SoundChannel* SoundPool::findNextChannel(int channelID)
201{
202    for (int i = 0; i < mMaxChannels; ++i) {
203        if (mChannelPool[i].nextChannelID() == channelID) {
204            return &mChannelPool[i];
205        }
206    }
207    return NULL;
208}
209
210int SoundPool::load(int fd, int64_t offset, int64_t length, int priority __unused)
211{
212    ALOGV("load: fd=%d, offset=%" PRId64 ", length=%" PRId64 ", 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, sampleID);
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, int sampleID)
275{
276    List<SoundChannel*>::iterator iter;
277    SoundChannel* channel = NULL;
278
279    // check if channel for given sampleID still available
280    if (!mChannels.empty()) {
281        for (iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
282            if (sampleID == (*iter)->getPrevSampleID() && (*iter)->state() == SoundChannel::IDLE) {
283                channel = *iter;
284                mChannels.erase(iter);
285                ALOGV("Allocated recycled channel for same sampleID");
286                break;
287            }
288        }
289    }
290
291    // allocate any channel
292    if (!channel && !mChannels.empty()) {
293        iter = mChannels.begin();
294        if (priority >= (*iter)->priority()) {
295            channel = *iter;
296            mChannels.erase(iter);
297            ALOGV("Allocated active channel");
298        }
299    }
300
301    // update priority and put it back in the list
302    if (channel) {
303        channel->setPriority(priority);
304        for (iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
305            if (priority < (*iter)->priority()) {
306                break;
307            }
308        }
309        mChannels.insert(iter, channel);
310    }
311    return channel;
312}
313
314// move a channel from its current position to the front of the list
315void SoundPool::moveToFront_l(SoundChannel* channel)
316{
317    for (List<SoundChannel*>::iterator iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
318        if (*iter == channel) {
319            mChannels.erase(iter);
320            mChannels.push_front(channel);
321            break;
322        }
323    }
324}
325
326void SoundPool::pause(int channelID)
327{
328    ALOGV("pause(%d)", channelID);
329    Mutex::Autolock lock(&mLock);
330    SoundChannel* channel = findChannel(channelID);
331    if (channel) {
332        channel->pause();
333    }
334}
335
336void SoundPool::autoPause()
337{
338    ALOGV("autoPause()");
339    Mutex::Autolock lock(&mLock);
340    for (int i = 0; i < mMaxChannels; ++i) {
341        SoundChannel* channel = &mChannelPool[i];
342        channel->autoPause();
343    }
344}
345
346void SoundPool::resume(int channelID)
347{
348    ALOGV("resume(%d)", channelID);
349    Mutex::Autolock lock(&mLock);
350    SoundChannel* channel = findChannel(channelID);
351    if (channel) {
352        channel->resume();
353    }
354}
355
356void SoundPool::autoResume()
357{
358    ALOGV("autoResume()");
359    Mutex::Autolock lock(&mLock);
360    for (int i = 0; i < mMaxChannels; ++i) {
361        SoundChannel* channel = &mChannelPool[i];
362        channel->autoResume();
363    }
364}
365
366void SoundPool::stop(int channelID)
367{
368    ALOGV("stop(%d)", channelID);
369    Mutex::Autolock lock(&mLock);
370    SoundChannel* channel = findChannel(channelID);
371    if (channel) {
372        channel->stop();
373    } else {
374        channel = findNextChannel(channelID);
375        if (channel)
376            channel->clearNextEvent();
377    }
378}
379
380void SoundPool::setVolume(int channelID, float leftVolume, float rightVolume)
381{
382    Mutex::Autolock lock(&mLock);
383    SoundChannel* channel = findChannel(channelID);
384    if (channel) {
385        channel->setVolume(leftVolume, rightVolume);
386    }
387}
388
389void SoundPool::setPriority(int channelID, int priority)
390{
391    ALOGV("setPriority(%d, %d)", channelID, priority);
392    Mutex::Autolock lock(&mLock);
393    SoundChannel* channel = findChannel(channelID);
394    if (channel) {
395        channel->setPriority(priority);
396    }
397}
398
399void SoundPool::setLoop(int channelID, int loop)
400{
401    ALOGV("setLoop(%d, %d)", channelID, loop);
402    Mutex::Autolock lock(&mLock);
403    SoundChannel* channel = findChannel(channelID);
404    if (channel) {
405        channel->setLoop(loop);
406    }
407}
408
409void SoundPool::setRate(int channelID, float rate)
410{
411    ALOGV("setRate(%d, %f)", channelID, rate);
412    Mutex::Autolock lock(&mLock);
413    SoundChannel* channel = findChannel(channelID);
414    if (channel) {
415        channel->setRate(rate);
416    }
417}
418
419// call with lock held
420void SoundPool::done_l(SoundChannel* channel)
421{
422    ALOGV("done_l(%d)", channel->channelID());
423    // if "stolen", play next event
424    if (channel->nextChannelID() != 0) {
425        ALOGV("add to restart list");
426        addToRestartList(channel);
427    }
428
429    // return to idle state
430    else {
431        ALOGV("move to front");
432        moveToFront_l(channel);
433    }
434}
435
436void SoundPool::setCallback(SoundPoolCallback* callback, void* user)
437{
438    Mutex::Autolock lock(&mCallbackLock);
439    mCallback = callback;
440    mUserData = user;
441}
442
443void SoundPool::notify(SoundPoolEvent event)
444{
445    Mutex::Autolock lock(&mCallbackLock);
446    if (mCallback != NULL) {
447        mCallback(event, this, mUserData);
448    }
449}
450
451void SoundPool::dump()
452{
453    for (int i = 0; i < mMaxChannels; ++i) {
454        mChannelPool[i].dump();
455    }
456}
457
458
459Sample::Sample(int sampleID, int fd, int64_t offset, int64_t length)
460{
461    init();
462    mSampleID = sampleID;
463    mFd = dup(fd);
464    mOffset = offset;
465    mLength = length;
466    ALOGV("create sampleID=%d, fd=%d, offset=%" PRId64 " length=%" PRId64,
467        mSampleID, mFd, mLength, mOffset);
468}
469
470void Sample::init()
471{
472    mSize = 0;
473    mRefCount = 0;
474    mSampleID = 0;
475    mState = UNLOADED;
476    mFd = -1;
477    mOffset = 0;
478    mLength = 0;
479}
480
481Sample::~Sample()
482{
483    ALOGV("Sample::destructor sampleID=%d, fd=%d", mSampleID, mFd);
484    if (mFd > 0) {
485        ALOGV("close(%d)", mFd);
486        ::close(mFd);
487    }
488}
489
490static status_t decode(int fd, int64_t offset, int64_t length,
491        uint32_t *rate, int *numChannels, audio_format_t *audioFormat,
492        sp<MemoryHeapBase> heap, size_t *memsize) {
493
494    ALOGV("fd %d, offset %" PRId64 ", size %" PRId64, fd, offset, length);
495    AMediaExtractor *ex = AMediaExtractor_new();
496    status_t err = AMediaExtractor_setDataSourceFd(ex, fd, offset, length);
497
498    if (err != AMEDIA_OK) {
499        AMediaExtractor_delete(ex);
500        return err;
501    }
502
503    *audioFormat = AUDIO_FORMAT_PCM_16_BIT;
504
505    size_t numTracks = AMediaExtractor_getTrackCount(ex);
506    for (size_t i = 0; i < numTracks; i++) {
507        AMediaFormat *format = AMediaExtractor_getTrackFormat(ex, i);
508        const char *mime;
509        if (!AMediaFormat_getString(format, AMEDIAFORMAT_KEY_MIME, &mime)) {
510            AMediaExtractor_delete(ex);
511            AMediaFormat_delete(format);
512            return UNKNOWN_ERROR;
513        }
514        if (strncmp(mime, "audio/", 6) == 0) {
515
516            AMediaCodec *codec = AMediaCodec_createDecoderByType(mime);
517            if (AMediaCodec_configure(codec, format,
518                    NULL /* window */, NULL /* drm */, 0 /* flags */) != AMEDIA_OK
519                || AMediaCodec_start(codec) != AMEDIA_OK
520                || AMediaExtractor_selectTrack(ex, i) != AMEDIA_OK) {
521                AMediaExtractor_delete(ex);
522                AMediaCodec_delete(codec);
523                AMediaFormat_delete(format);
524                return UNKNOWN_ERROR;
525            }
526
527            bool sawInputEOS = false;
528            bool sawOutputEOS = false;
529            uint8_t* writePos = static_cast<uint8_t*>(heap->getBase());
530            size_t available = heap->getSize();
531            size_t written = 0;
532
533            AMediaFormat_delete(format);
534            format = AMediaCodec_getOutputFormat(codec);
535
536            while (!sawOutputEOS) {
537                if (!sawInputEOS) {
538                    ssize_t bufidx = AMediaCodec_dequeueInputBuffer(codec, 5000);
539                    ALOGV("input buffer %zd", bufidx);
540                    if (bufidx >= 0) {
541                        size_t bufsize;
542                        uint8_t *buf = AMediaCodec_getInputBuffer(codec, bufidx, &bufsize);
543                        int sampleSize = AMediaExtractor_readSampleData(ex, buf, bufsize);
544                        ALOGV("read %d", sampleSize);
545                        if (sampleSize < 0) {
546                            sampleSize = 0;
547                            sawInputEOS = true;
548                            ALOGV("EOS");
549                        }
550                        int64_t presentationTimeUs = AMediaExtractor_getSampleTime(ex);
551
552                        AMediaCodec_queueInputBuffer(codec, bufidx,
553                                0 /* offset */, sampleSize, presentationTimeUs,
554                                sawInputEOS ? AMEDIACODEC_BUFFER_FLAG_END_OF_STREAM : 0);
555                        AMediaExtractor_advance(ex);
556                    }
557                }
558
559                AMediaCodecBufferInfo info;
560                int status = AMediaCodec_dequeueOutputBuffer(codec, &info, 1);
561                ALOGV("dequeueoutput returned: %d", status);
562                if (status >= 0) {
563                    if (info.flags & AMEDIACODEC_BUFFER_FLAG_END_OF_STREAM) {
564                        ALOGV("output EOS");
565                        sawOutputEOS = true;
566                    }
567                    ALOGV("got decoded buffer size %d", info.size);
568
569                    uint8_t *buf = AMediaCodec_getOutputBuffer(codec, status, NULL /* out_size */);
570                    size_t dataSize = info.size;
571                    if (dataSize > available) {
572                        dataSize = available;
573                    }
574                    memcpy(writePos, buf + info.offset, dataSize);
575                    writePos += dataSize;
576                    written += dataSize;
577                    available -= dataSize;
578                    AMediaCodec_releaseOutputBuffer(codec, status, false /* render */);
579                    if (available == 0) {
580                        // there might be more data, but there's no space for it
581                        sawOutputEOS = true;
582                    }
583                } else if (status == AMEDIACODEC_INFO_OUTPUT_BUFFERS_CHANGED) {
584                    ALOGV("output buffers changed");
585                } else if (status == AMEDIACODEC_INFO_OUTPUT_FORMAT_CHANGED) {
586                    AMediaFormat_delete(format);
587                    format = AMediaCodec_getOutputFormat(codec);
588                    ALOGV("format changed to: %s", AMediaFormat_toString(format));
589                } else if (status == AMEDIACODEC_INFO_TRY_AGAIN_LATER) {
590                    ALOGV("no output buffer right now");
591                } else {
592                    ALOGV("unexpected info code: %d", status);
593                }
594            }
595
596            AMediaCodec_stop(codec);
597            AMediaCodec_delete(codec);
598            AMediaExtractor_delete(ex);
599            if (!AMediaFormat_getInt32(format, AMEDIAFORMAT_KEY_SAMPLE_RATE, (int32_t*) rate) ||
600                    !AMediaFormat_getInt32(format, AMEDIAFORMAT_KEY_CHANNEL_COUNT, numChannels)) {
601                AMediaFormat_delete(format);
602                return UNKNOWN_ERROR;
603            }
604            AMediaFormat_delete(format);
605            *memsize = written;
606            return OK;
607        }
608        AMediaFormat_delete(format);
609    }
610    AMediaExtractor_delete(ex);
611    return UNKNOWN_ERROR;
612}
613
614status_t Sample::doLoad()
615{
616    uint32_t sampleRate;
617    int numChannels;
618    audio_format_t format;
619    status_t status;
620    mHeap = new MemoryHeapBase(kDefaultHeapSize);
621
622    ALOGV("Start decode");
623    status = decode(mFd, mOffset, mLength, &sampleRate, &numChannels, &format,
624                                 mHeap, &mSize);
625    ALOGV("close(%d)", mFd);
626    ::close(mFd);
627    mFd = -1;
628    if (status != NO_ERROR) {
629        ALOGE("Unable to load sample");
630        goto error;
631    }
632    ALOGV("pointer = %p, size = %zu, sampleRate = %u, numChannels = %d",
633          mHeap->getBase(), mSize, sampleRate, numChannels);
634
635    if (sampleRate > kMaxSampleRate) {
636       ALOGE("Sample rate (%u) out of range", sampleRate);
637       status = BAD_VALUE;
638       goto error;
639    }
640
641    if ((numChannels < 1) || (numChannels > 2)) {
642        ALOGE("Sample channel count (%d) out of range", numChannels);
643        status = BAD_VALUE;
644        goto error;
645    }
646
647    mData = new MemoryBase(mHeap, 0, mSize);
648    mSampleRate = sampleRate;
649    mNumChannels = numChannels;
650    mFormat = format;
651    mState = READY;
652    return NO_ERROR;
653
654error:
655    mHeap.clear();
656    return status;
657}
658
659
660void SoundChannel::init(SoundPool* soundPool)
661{
662    mSoundPool = soundPool;
663    mPrevSampleID = -1;
664}
665
666// call with sound pool lock held
667void SoundChannel::play(const sp<Sample>& sample, int nextChannelID, float leftVolume,
668        float rightVolume, int priority, int loop, float rate)
669{
670    sp<AudioTrack> oldTrack;
671    sp<AudioTrack> newTrack;
672    status_t status = NO_ERROR;
673
674    { // scope for the lock
675        Mutex::Autolock lock(&mLock);
676
677        ALOGV("SoundChannel::play %p: sampleID=%d, channelID=%d, leftVolume=%f, rightVolume=%f,"
678                " priority=%d, loop=%d, rate=%f",
679                this, sample->sampleID(), nextChannelID, leftVolume, rightVolume,
680                priority, loop, rate);
681
682        // if not idle, this voice is being stolen
683        if (mState != IDLE) {
684            ALOGV("channel %d stolen - event queued for channel %d", channelID(), nextChannelID);
685            mNextEvent.set(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
686            stop_l();
687            return;
688        }
689
690        // initialize track
691        size_t afFrameCount;
692        uint32_t afSampleRate;
693        audio_stream_type_t streamType = audio_attributes_to_stream_type(mSoundPool->attributes());
694        if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) {
695            afFrameCount = kDefaultFrameCount;
696        }
697        if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) {
698            afSampleRate = kDefaultSampleRate;
699        }
700        int numChannels = sample->numChannels();
701        uint32_t sampleRate = uint32_t(float(sample->sampleRate()) * rate + 0.5);
702        size_t frameCount = 0;
703
704        if (loop) {
705            frameCount = sample->size()/numChannels/
706                ((sample->format() == AUDIO_FORMAT_PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
707        }
708
709#ifndef USE_SHARED_MEM_BUFFER
710        uint32_t totalFrames = (kDefaultBufferCount * afFrameCount * sampleRate) / afSampleRate;
711        // Ensure minimum audio buffer size in case of short looped sample
712        if(frameCount < totalFrames) {
713            frameCount = totalFrames;
714        }
715#endif
716
717        if (!mAudioTrack.get() || mPrevSampleID != sample->sampleID()) {
718            // mToggle toggles each time a track is started on a given channel.
719            // The toggle is concatenated with the SoundChannel address and passed to AudioTrack
720            // as callback user data. This enables the detection of callbacks received from the old
721            // audio track while the new one is being started and avoids processing them with
722            // wrong audio audio buffer size  (mAudioBufferSize)
723            unsigned long toggle = mToggle ^ 1;
724            void *userData = (void *)((unsigned long)this | toggle);
725            audio_channel_mask_t channelMask = audio_channel_out_mask_from_count(numChannels);
726
727            // do not create a new audio track if current track is compatible with sample parameters
728    #ifdef USE_SHARED_MEM_BUFFER
729            newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
730                    channelMask, sample->getIMemory(), AUDIO_OUTPUT_FLAG_FAST, callback, userData);
731    #else
732            uint32_t bufferFrames = (totalFrames + (kDefaultBufferCount - 1)) / kDefaultBufferCount;
733            newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
734                    channelMask, frameCount, AUDIO_OUTPUT_FLAG_FAST, callback, userData,
735                    bufferFrames);
736    #endif
737            oldTrack = mAudioTrack;
738            status = newTrack->initCheck();
739            if (status != NO_ERROR) {
740                ALOGE("Error creating AudioTrack");
741                goto exit;
742            }
743            // From now on, AudioTrack callbacks received with previous toggle value will be ignored.
744            mToggle = toggle;
745            mAudioTrack = newTrack;
746        } else {
747            newTrack = mAudioTrack;
748            ALOGV("reusing track %p for sample %d", mAudioTrack.get(), sample->sampleID());
749        }
750        newTrack->setVolume(leftVolume, rightVolume);
751        newTrack->setLoop(0, frameCount, loop);
752        mPos = 0;
753        mSample = sample;
754        mChannelID = nextChannelID;
755        mPriority = priority;
756        mLoop = loop;
757        mLeftVolume = leftVolume;
758        mRightVolume = rightVolume;
759        mNumChannels = numChannels;
760        mRate = rate;
761        clearNextEvent();
762        mState = PLAYING;
763        mAudioTrack->start();
764        mAudioBufferSize = newTrack->frameCount()*newTrack->frameSize();
765    }
766
767exit:
768    ALOGV("delete oldTrack %p", oldTrack.get());
769    if (status != NO_ERROR) {
770        mAudioTrack.clear();
771    }
772}
773
774void SoundChannel::nextEvent()
775{
776    sp<Sample> sample;
777    int nextChannelID;
778    float leftVolume;
779    float rightVolume;
780    int priority;
781    int loop;
782    float rate;
783
784    // check for valid event
785    {
786        Mutex::Autolock lock(&mLock);
787        nextChannelID = mNextEvent.channelID();
788        if (nextChannelID  == 0) {
789            ALOGV("stolen channel has no event");
790            return;
791        }
792
793        sample = mNextEvent.sample();
794        leftVolume = mNextEvent.leftVolume();
795        rightVolume = mNextEvent.rightVolume();
796        priority = mNextEvent.priority();
797        loop = mNextEvent.loop();
798        rate = mNextEvent.rate();
799    }
800
801    ALOGV("Starting stolen channel %d -> %d", channelID(), nextChannelID);
802    play(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
803}
804
805void SoundChannel::callback(int event, void* user, void *info)
806{
807    SoundChannel* channel = static_cast<SoundChannel*>((void *)((unsigned long)user & ~1));
808
809    channel->process(event, info, (unsigned long)user & 1);
810}
811
812void SoundChannel::process(int event, void *info, unsigned long toggle)
813{
814    //ALOGV("process(%d)", mChannelID);
815
816    Mutex::Autolock lock(&mLock);
817
818    AudioTrack::Buffer* b = NULL;
819    if (event == AudioTrack::EVENT_MORE_DATA) {
820       b = static_cast<AudioTrack::Buffer *>(info);
821    }
822
823    if (mToggle != toggle) {
824        ALOGV("process wrong toggle %p channel %d", this, mChannelID);
825        if (b != NULL) {
826            b->size = 0;
827        }
828        return;
829    }
830
831    sp<Sample> sample = mSample;
832
833//    ALOGV("SoundChannel::process event %d", event);
834
835    if (event == AudioTrack::EVENT_MORE_DATA) {
836
837        // check for stop state
838        if (b->size == 0) return;
839
840        if (mState == IDLE) {
841            b->size = 0;
842            return;
843        }
844
845        if (sample != 0) {
846            // fill buffer
847            uint8_t* q = (uint8_t*) b->i8;
848            size_t count = 0;
849
850            if (mPos < (int)sample->size()) {
851                uint8_t* p = sample->data() + mPos;
852                count = sample->size() - mPos;
853                if (count > b->size) {
854                    count = b->size;
855                }
856                memcpy(q, p, count);
857//              ALOGV("fill: q=%p, p=%p, mPos=%u, b->size=%u, count=%d", q, p, mPos, b->size,
858//                      count);
859            } else if (mPos < mAudioBufferSize) {
860                count = mAudioBufferSize - mPos;
861                if (count > b->size) {
862                    count = b->size;
863                }
864                memset(q, 0, count);
865//              ALOGV("fill extra: q=%p, mPos=%u, b->size=%u, count=%d", q, mPos, b->size, count);
866            }
867
868            mPos += count;
869            b->size = count;
870            //ALOGV("buffer=%p, [0]=%d", b->i16, b->i16[0]);
871        }
872    } else if (event == AudioTrack::EVENT_UNDERRUN || event == AudioTrack::EVENT_BUFFER_END) {
873        ALOGV("process %p channel %d event %s",
874              this, mChannelID, (event == AudioTrack::EVENT_UNDERRUN) ? "UNDERRUN" :
875                      "BUFFER_END");
876        mSoundPool->addToStopList(this);
877    } else if (event == AudioTrack::EVENT_LOOP_END) {
878        ALOGV("End loop %p channel %d", this, mChannelID);
879    } else if (event == AudioTrack::EVENT_NEW_IAUDIOTRACK) {
880        ALOGV("process %p channel %d NEW_IAUDIOTRACK", this, mChannelID);
881    } else {
882        ALOGW("SoundChannel::process unexpected event %d", event);
883    }
884}
885
886
887// call with lock held
888bool SoundChannel::doStop_l()
889{
890    if (mState != IDLE) {
891        setVolume_l(0, 0);
892        ALOGV("stop");
893        mAudioTrack->stop();
894        mPrevSampleID = mSample->sampleID();
895        mSample.clear();
896        mState = IDLE;
897        mPriority = IDLE_PRIORITY;
898        return true;
899    }
900    return false;
901}
902
903// call with lock held and sound pool lock held
904void SoundChannel::stop_l()
905{
906    if (doStop_l()) {
907        mSoundPool->done_l(this);
908    }
909}
910
911// call with sound pool lock held
912void SoundChannel::stop()
913{
914    bool stopped;
915    {
916        Mutex::Autolock lock(&mLock);
917        stopped = doStop_l();
918    }
919
920    if (stopped) {
921        mSoundPool->done_l(this);
922    }
923}
924
925//FIXME: Pause is a little broken right now
926void SoundChannel::pause()
927{
928    Mutex::Autolock lock(&mLock);
929    if (mState == PLAYING) {
930        ALOGV("pause track");
931        mState = PAUSED;
932        mAudioTrack->pause();
933    }
934}
935
936void SoundChannel::autoPause()
937{
938    Mutex::Autolock lock(&mLock);
939    if (mState == PLAYING) {
940        ALOGV("pause track");
941        mState = PAUSED;
942        mAutoPaused = true;
943        mAudioTrack->pause();
944    }
945}
946
947void SoundChannel::resume()
948{
949    Mutex::Autolock lock(&mLock);
950    if (mState == PAUSED) {
951        ALOGV("resume track");
952        mState = PLAYING;
953        mAutoPaused = false;
954        mAudioTrack->start();
955    }
956}
957
958void SoundChannel::autoResume()
959{
960    Mutex::Autolock lock(&mLock);
961    if (mAutoPaused && (mState == PAUSED)) {
962        ALOGV("resume track");
963        mState = PLAYING;
964        mAutoPaused = false;
965        mAudioTrack->start();
966    }
967}
968
969void SoundChannel::setRate(float rate)
970{
971    Mutex::Autolock lock(&mLock);
972    if (mAudioTrack != NULL && mSample != 0) {
973        uint32_t sampleRate = uint32_t(float(mSample->sampleRate()) * rate + 0.5);
974        mAudioTrack->setSampleRate(sampleRate);
975        mRate = rate;
976    }
977}
978
979// call with lock held
980void SoundChannel::setVolume_l(float leftVolume, float rightVolume)
981{
982    mLeftVolume = leftVolume;
983    mRightVolume = rightVolume;
984    if (mAudioTrack != NULL)
985        mAudioTrack->setVolume(leftVolume, rightVolume);
986}
987
988void SoundChannel::setVolume(float leftVolume, float rightVolume)
989{
990    Mutex::Autolock lock(&mLock);
991    setVolume_l(leftVolume, rightVolume);
992}
993
994void SoundChannel::setLoop(int loop)
995{
996    Mutex::Autolock lock(&mLock);
997    if (mAudioTrack != NULL && mSample != 0) {
998        uint32_t loopEnd = mSample->size()/mNumChannels/
999            ((mSample->format() == AUDIO_FORMAT_PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
1000        mAudioTrack->setLoop(0, loopEnd, loop);
1001        mLoop = loop;
1002    }
1003}
1004
1005SoundChannel::~SoundChannel()
1006{
1007    ALOGV("SoundChannel destructor %p", this);
1008    {
1009        Mutex::Autolock lock(&mLock);
1010        clearNextEvent();
1011        doStop_l();
1012    }
1013    // do not call AudioTrack destructor with mLock held as it will wait for the AudioTrack
1014    // callback thread to exit which may need to execute process() and acquire the mLock.
1015    mAudioTrack.clear();
1016}
1017
1018void SoundChannel::dump()
1019{
1020    ALOGV("mState = %d mChannelID=%d, mNumChannels=%d, mPos = %d, mPriority=%d, mLoop=%d",
1021            mState, mChannelID, mNumChannels, mPos, mPriority, mLoop);
1022}
1023
1024void SoundEvent::set(const sp<Sample>& sample, int channelID, float leftVolume,
1025            float rightVolume, int priority, int loop, float rate)
1026{
1027    mSample = sample;
1028    mChannelID = channelID;
1029    mLeftVolume = leftVolume;
1030    mRightVolume = rightVolume;
1031    mPriority = priority;
1032    mLoop = loop;
1033    mRate =rate;
1034}
1035
1036} // end namespace android
1037