media/jni/soundpool/SoundPool.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2007 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 //#define LOG_NDEBUG 0
 #define LOG_TAG "SoundPool"
 #include <utils/Log.h>

 //#define USE_SHARED_MEM_BUFFER

 // XXX needed for timing latency
 #include <utils/Timers.h>

 #include <sys/resource.h>
 #include <media/AudioTrack.h>
 #include <media/mediaplayer.h>

 #include "SoundPool.h"
 #include "SoundPoolThread.h"

 namespace android
 {

 int kDefaultBufferCount = 4;
 uint32_t kMaxSampleRate = 48000;
 uint32_t kDefaultSampleRate = 44100;
 uint32_t kDefaultFrameCount = 1200;

 SoundPool::SoundPool(jobject soundPoolRef, int maxChannels, int streamType, int srcQuality)
 {
     LOGV("SoundPool constructor: maxChannels=%d, streamType=%d, srcQuality=%d",
             maxChannels, streamType, srcQuality);

     // check limits
     mMaxChannels = maxChannels;
     if (mMaxChannels < 1) {
         mMaxChannels = 1;
     }
     else if (mMaxChannels > 32) {
         mMaxChannels = 32;
     }
     LOGW_IF(maxChannels != mMaxChannels, "App requested %d channels", maxChannels);

     mQuit = false;
     mSoundPoolRef = soundPoolRef;
     mDecodeThread = 0;
     mStreamType = streamType;
     mSrcQuality = srcQuality;
     mAllocated = 0;
     mNextSampleID = 0;
     mNextChannelID = 0;

     mChannelPool = new SoundChannel[mMaxChannels];
     for (int i = 0; i < mMaxChannels; ++i) {
         mChannelPool[i].init(this);
         mChannels.push_back(&mChannelPool[i]);
     }

     // start decode thread
     startThreads();
 }

 SoundPool::~SoundPool()
 {
     LOGV("SoundPool destructor");
     mDecodeThread->quit();
     quit();

     Mutex::Autolock lock(&mLock);
     mChannels.clear();
     if (mChannelPool)
         delete [] mChannelPool;

     // clean up samples
     LOGV("clear samples");
     mSamples.clear();

     if (mDecodeThread)
         delete mDecodeThread;
 }

 void SoundPool::addToRestartList(SoundChannel* channel)
 {
     Mutex::Autolock lock(&mRestartLock);
     mRestart.push_back(channel);
     mCondition.signal();
 }

 int SoundPool::beginThread(void* arg)
 {
     SoundPool* p = (SoundPool*)arg;
     return p->run();
 }

 int SoundPool::run()
 {
     mRestartLock.lock();
     while (!mQuit) {
         mCondition.wait(mRestartLock);
         LOGV("awake");
         if (mQuit) break;

         while (!mRestart.empty()) {
             SoundChannel* channel;
             LOGV("Getting channel from list");
             List<SoundChannel*>::iterator iter = mRestart.begin();
             channel = *iter;
             mRestart.erase(iter);
             if (channel) channel->nextEvent();
             if (mQuit) break;
         }
     }

     mRestart.clear();
     mCondition.signal();
     mRestartLock.unlock();
     LOGV("goodbye");
     return 0;
 }

 void SoundPool::quit()
 {
     mRestartLock.lock();
     mQuit = true;
     mCondition.signal();
     mCondition.wait(mRestartLock);
     LOGV("return from quit");
     mRestartLock.unlock();
 }

 bool SoundPool::startThreads()
 {
     createThread(beginThread, this);
     if (mDecodeThread == NULL)
         mDecodeThread = new SoundPoolThread(this);
     return mDecodeThread != NULL;
 }

 SoundChannel* SoundPool::findChannel(int channelID)
 {
     for (int i = 0; i < mMaxChannels; ++i) {
         if (mChannelPool[i].channelID() == channelID) {
             return &mChannelPool[i];
         }
     }
     return NULL;
 }

 SoundChannel* SoundPool::findNextChannel(int channelID)
 {
     for (int i = 0; i < mMaxChannels; ++i) {
         if (mChannelPool[i].nextChannelID() == channelID) {
             return &mChannelPool[i];
         }
     }
     return NULL;
 }

 int SoundPool::load(const char* path, int priority)
 {
     LOGV("load: path=%s, priority=%d", path, priority);
     Mutex::Autolock lock(&mLock);
     sp<Sample> sample = new Sample(++mNextSampleID, path);
     mSamples.add(sample->sampleID(), sample);
     doLoad(sample);
     return sample->sampleID();
 }

 int SoundPool::load(int fd, int64_t offset, int64_t length, int priority)
 {
     LOGV("load: fd=%d, offset=%lld, length=%lld, priority=%d",
             fd, offset, length, priority);
     Mutex::Autolock lock(&mLock);
     sp<Sample> sample = new Sample(++mNextSampleID, fd, offset, length);
     mSamples.add(sample->sampleID(), sample);
     doLoad(sample);
     return sample->sampleID();
 }

 void SoundPool::doLoad(sp<Sample>& sample)
 {
     LOGV("doLoad: loading sample sampleID=%d", sample->sampleID());
     sample->startLoad();
     mDecodeThread->loadSample(sample->sampleID());
 }

 bool SoundPool::unload(int sampleID)
 {
     LOGV("unload: sampleID=%d", sampleID);
     Mutex::Autolock lock(&mLock);
     return mSamples.removeItem(sampleID);
 }

 int SoundPool::play(int sampleID, float leftVolume, float rightVolume,
         int priority, int loop, float rate)
 {
     LOGV("sampleID=%d, leftVolume=%f, rightVolume=%f, priority=%d, loop=%d, rate=%f",
             sampleID, leftVolume, rightVolume, priority, loop, rate);
     sp<Sample> sample;
     SoundChannel* channel;
     int channelID;

     // scope for lock
     {
         Mutex::Autolock lock(&mLock);

         // is sample ready?
         sample = findSample(sampleID);
         if ((sample == 0) || (sample->state() != Sample::READY)) {
             LOGW("  sample %d not READY", sampleID);
             return 0;
         }

         dump();

         // allocate a channel
         channel = allocateChannel(priority);

         // no channel allocated - return 0
         if (!channel) {
             LOGV("No channel allocated");
             return 0;
         }

         channelID = ++mNextChannelID;
     }

     LOGV("channel state = %d", channel->state());
     channel->play(sample, channelID, leftVolume, rightVolume, priority, loop, rate);
     return channelID;
 }

 SoundChannel* SoundPool::allocateChannel(int priority)
 {
     List<SoundChannel*>::iterator iter;
     SoundChannel* channel = NULL;

     // allocate a channel
     if (!mChannels.empty()) {
         iter = mChannels.begin();
         if (priority >= (*iter)->priority()) {
             channel = *iter;
             mChannels.erase(iter);
             LOGV("Allocated active channel");
         }
     }

     // update priority and put it back in the list
     if (channel) {
         channel->setPriority(priority);
         for (iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
             if (priority < (*iter)->priority()) {
                 break;
             }
         }
         mChannels.insert(iter, channel);
     }
     return channel;
 }

 // move a channel from its current position to the front of the list
 void SoundPool::moveToFront(SoundChannel* channel)
 {
     for (List<SoundChannel*>::iterator iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
         if (*iter == channel) {
             mChannels.erase(iter);
             mChannels.push_front(channel);
             break;
         }
     }
 }

 void SoundPool::pause(int channelID)
 {
     LOGV("pause(%d)", channelID);
     Mutex::Autolock lock(&mLock);
     SoundChannel* channel = findChannel(channelID);
     if (channel) {
         channel->pause();
     }
 }

 void SoundPool::resume(int channelID)
 {
     LOGV("resume(%d)", channelID);
     Mutex::Autolock lock(&mLock);
     SoundChannel* channel = findChannel(channelID);
     if (channel) {
         channel->resume();
     }
 }

 void SoundPool::stop(int channelID)
 {
     LOGV("stop(%d)", channelID);
     Mutex::Autolock lock(&mLock);
     SoundChannel* channel = findChannel(channelID);
     if (channel) {
         channel->stop();
     } else {
         channel = findNextChannel(channelID);
         if (channel)
             channel->clearNextEvent();
     }
 }

 void SoundPool::setVolume(int channelID, float leftVolume, float rightVolume)
 {
     Mutex::Autolock lock(&mLock);
     SoundChannel* channel = findChannel(channelID);
     if (channel) {
         channel->setVolume(leftVolume, rightVolume);
     }
 }

 void SoundPool::setPriority(int channelID, int priority)
 {
     LOGV("setPriority(%d, %d)", channelID, priority);
     Mutex::Autolock lock(&mLock);
     SoundChannel* channel = findChannel(channelID);
     if (channel) {
         channel->setPriority(priority);
     }
 }

 void SoundPool::setLoop(int channelID, int loop)
 {
     LOGV("setLoop(%d, %d)", channelID, loop);
     Mutex::Autolock lock(&mLock);
     SoundChannel* channel = findChannel(channelID);
     if (channel) {
         channel->setLoop(loop);
     }
 }

 void SoundPool::setRate(int channelID, float rate)
 {
     LOGV("setRate(%d, %f)", channelID, rate);
     Mutex::Autolock lock(&mLock);
     SoundChannel* channel = findChannel(channelID);
     if (channel) {
         channel->setRate(rate);
     }
 }

 // call with lock held
 void SoundPool::done(SoundChannel* channel)
 {
     LOGV("done(%d)", channel->channelID());

     // if "stolen", play next event
     if (channel->nextChannelID() != 0) {
         LOGV("add to restart list");
         addToRestartList(channel);
     }

     // return to idle state
     else {
         LOGV("move to front");
         moveToFront(channel);
     }
 }

 void SoundPool::dump()
 {
     for (int i = 0; i < mMaxChannels; ++i) {
         mChannelPool[i].dump();
     }
 }


 Sample::Sample(int sampleID, const char* url)
 {
     init();
     mSampleID = sampleID;
     mUrl = strdup(url);
     LOGV("create sampleID=%d, url=%s", mSampleID, mUrl);
 }

 Sample::Sample(int sampleID, int fd, int64_t offset, int64_t length)
 {
     init();
     mSampleID = sampleID;
     mFd = dup(fd);
     mOffset = offset;
     mLength = length;
     LOGV("create sampleID=%d, fd=%d, offset=%lld, length=%lld", mSampleID, mFd, mLength, mOffset);
 }

 void Sample::init()
 {
     mData = 0;
     mSize = 0;
     mRefCount = 0;
     mSampleID = 0;
     mState = UNLOADED;
     mFd = -1;
     mOffset = 0;
     mLength = 0;
     mUrl = 0;
 }

 Sample::~Sample()
 {
     LOGV("Sample::destructor sampleID=%d, fd=%d", mSampleID, mFd);
     if (mFd > 0) {
         LOGV("close(%d)", mFd);
         ::close(mFd);
     }
     mData.clear();
     delete mUrl;
 }

 void Sample::doLoad()
 {
     uint32_t sampleRate;
     int numChannels;
     int format;
     sp<IMemory> p;
     LOGV("Start decode");
     if (mUrl) {
         p = MediaPlayer::decode(mUrl, &sampleRate, &numChannels, &format);
     } else {
         p = MediaPlayer::decode(mFd, mOffset, mLength, &sampleRate, &numChannels, &format);
         LOGV("close(%d)", mFd);
         ::close(mFd);
         mFd = -1;
     }
     if (p == 0) {
         LOGE("Unable to load sample: %s", mUrl);
         return;
     }
     LOGV("pointer = %p, size = %u, sampleRate = %u, numChannels = %d",
             p->pointer(), p->size(), sampleRate, numChannels);

     if (sampleRate > kMaxSampleRate) {
        LOGE("Sample rate (%u) out of range", sampleRate);
        return;
     }

     if ((numChannels < 1) || (numChannels > 2)) {
         LOGE("Sample channel count (%d) out of range", numChannels);
         return;
     }

     //_dumpBuffer(p->pointer(), p->size());
     uint8_t* q = static_cast<uint8_t*>(p->pointer()) + p->size() - 10;
     //_dumpBuffer(q, 10, 10, false);

     mData = p;
     mSize = p->size();
     mSampleRate = sampleRate;
     mNumChannels = numChannels;
     mFormat = format;
     mState = READY;
 }


 void SoundChannel::init(SoundPool* soundPool)
 {
     mSoundPool = soundPool;
 }

 void SoundChannel::play(const sp<Sample>& sample, int nextChannelID, float leftVolume,
         float rightVolume, int priority, int loop, float rate)
 {
     AudioTrack* oldTrack;

     LOGV("play %p: sampleID=%d, channelID=%d, leftVolume=%f, rightVolume=%f, priority=%d, loop=%d, rate=%f",
             this, sample->sampleID(), nextChannelID, leftVolume, rightVolume, priority, loop, rate);

     // if not idle, this voice is being stolen
     if (mState != IDLE) {
         LOGV("channel %d stolen - event queued for channel %d", channelID(), nextChannelID);
         mNextEvent.set(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
         stop();
         return;
     }

     // initialize track
     int afFrameCount;
     int afSampleRate;
     int streamType = mSoundPool->streamType();
     if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) {
         afFrameCount = kDefaultFrameCount;
     }
     if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) {
         afSampleRate = kDefaultSampleRate;
     }
     int numChannels = sample->numChannels();
     uint32_t sampleRate = uint32_t(float(sample->sampleRate()) * rate + 0.5);
     uint32_t totalFrames = (kDefaultBufferCount * afFrameCount * sampleRate) / afSampleRate;
     uint32_t bufferFrames = (totalFrames + (kDefaultBufferCount - 1)) / kDefaultBufferCount;
     uint32_t frameCount = 0;

     if (loop) {
         frameCount = sample->size()/numChannels/((sample->format() == AudioSystem::PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
     }

 #ifndef USE_SHARED_MEM_BUFFER
     // Ensure minimum audio buffer size in case of short looped sample
     if(frameCount < totalFrames) {
         frameCount = totalFrames;
     }
 #endif

     AudioTrack* newTrack;

     // mToggle toggles each time a track is started on a given channel.
     // The toggle is concatenated with the SoundChannel address and passed to AudioTrack
     // as callback user data. This enables the detection of callbacks received from the old
     // audio track while the new one is being started and avoids processing them with
     // wrong audio audio buffer size  (mAudioBufferSize)
     unsigned long toggle = mToggle ^ 1;
     void *userData = (void *)((unsigned long)this | toggle);
     uint32_t channels = (numChannels == 2) ? AudioSystem::CHANNEL_OUT_STEREO : AudioSystem::CHANNEL_OUT_MONO;

 #ifdef USE_SHARED_MEM_BUFFER
     newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
             channels, sample->getIMemory(), 0, callback, userData);
 #else
     newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
             channels, frameCount, 0, callback, userData, bufferFrames);
 #endif
     if (newTrack->initCheck() != NO_ERROR) {
         LOGE("Error creating AudioTrack");
         delete newTrack;
         return;
     }
     LOGV("setVolume %p", newTrack);
     newTrack->setVolume(leftVolume, rightVolume);
     newTrack->setLoop(0, frameCount, loop);

     {
         Mutex::Autolock lock(&mLock);
         // From now on, AudioTrack callbacks recevieved with previous toggle value will be ignored.
         mToggle = toggle;
         oldTrack = mAudioTrack;
         mAudioTrack = newTrack;
         mPos = 0;
         mSample = sample;
         mChannelID = nextChannelID;
         mPriority = priority;
         mLoop = loop;
         mLeftVolume = leftVolume;
         mRightVolume = rightVolume;
         mNumChannels = numChannels;
         mRate = rate;
         clearNextEvent();
         mState = PLAYING;
         mAudioTrack->start();
         mAudioBufferSize = newTrack->frameCount()*newTrack->frameSize();
     }

     LOGV("delete oldTrack %p", oldTrack);
     delete oldTrack;
 }

 void SoundChannel::nextEvent()
 {
     sp<Sample> sample;
     int nextChannelID;
     float leftVolume;
     float rightVolume;
     int priority;
     int loop;
     float rate;

     // check for valid event
     {
         Mutex::Autolock lock(&mLock);
         nextChannelID = mNextEvent.channelID();
         if (nextChannelID  == 0) {
             LOGV("stolen channel has no event");
             return;
         }

         sample = mNextEvent.sample();
         leftVolume = mNextEvent.leftVolume();
         rightVolume = mNextEvent.rightVolume();
         priority = mNextEvent.priority();
         loop = mNextEvent.loop();
         rate = mNextEvent.rate();
     }

     LOGV("Starting stolen channel %d -> %d", channelID(), nextChannelID);
     play(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
 }

 void SoundChannel::callback(int event, void* user, void *info)
 {
     unsigned long toggle = (unsigned long)user & 1;
     SoundChannel* channel = static_cast<SoundChannel*>((void *)((unsigned long)user & ~1));

     if (channel->mToggle != toggle) {
         LOGV("callback with wrong toggle");
         return;
     }
     channel->process(event, info);
 }

 void SoundChannel::process(int event, void *info)
 {
     //LOGV("process(%d)", mChannelID);
     sp<Sample> sample = mSample;

 //    LOGV("SoundChannel::process event %d", event);

     if (event == AudioTrack::EVENT_MORE_DATA) {
        AudioTrack::Buffer* b = static_cast<AudioTrack::Buffer *>(info);

         // check for stop state
         if (b->size == 0) return;

         if (sample != 0) {
             // fill buffer
             uint8_t* q = (uint8_t*) b->i8;
             size_t count = 0;

             if (mPos < (int)sample->size()) {
                 uint8_t* p = sample->data() + mPos;
                 count = sample->size() - mPos;
                 if (count > b->size) {
                     count = b->size;
                 }
                 memcpy(q, p, count);
                 LOGV("fill: q=%p, p=%p, mPos=%u, b->size=%u, count=%d", q, p, mPos, b->size, count);
             } else if (mPos < mAudioBufferSize) {
                 count = mAudioBufferSize - mPos;
                 if (count > b->size) {
                     count = b->size;
                 }
                 memset(q, 0, count);
                 LOGV("fill extra: q=%p, mPos=%u, b->size=%u, count=%d", q, mPos, b->size, count);
             }

             mPos += count;
             b->size = count;
             //LOGV("buffer=%p, [0]=%d", b->i16, b->i16[0]);
         }
     } else if (event == AudioTrack::EVENT_UNDERRUN) {
         LOGV("stopping track");
         stop();
     } else if (event == AudioTrack::EVENT_LOOP_END) {
         LOGV("End loop: %d", *(int *)info);
     }
 }


 // call with lock held
 void SoundChannel::stop_l()
 {
     if (mState != IDLE) {
         setVolume_l(0, 0);
         LOGV("stop");
         mAudioTrack->stop();
         mSample.clear();
         mState = IDLE;
         mPriority = IDLE_PRIORITY;
     }
 }

 void SoundChannel::stop()
 {
     {
         Mutex::Autolock lock(&mLock);
         stop_l();
     }
     mSoundPool->done(this);
 }

 //FIXME: Pause is a little broken right now
 void SoundChannel::pause()
 {
     Mutex::Autolock lock(&mLock);
     if (mState == PLAYING) {
         LOGV("pause track");
         mState = PAUSED;
         mAudioTrack->pause();
     }
 }

 void SoundChannel::resume()
 {
     Mutex::Autolock lock(&mLock);
     if (mState == PAUSED) {
         LOGV("resume track");
         mState = PLAYING;
         mAudioTrack->start();
     }
 }

 void SoundChannel::setRate(float rate)
 {
     Mutex::Autolock lock(&mLock);
     if (mAudioTrack != 0 && mSample.get() != 0) {
         uint32_t sampleRate = uint32_t(float(mSample->sampleRate()) * rate + 0.5);
         mAudioTrack->setSampleRate(sampleRate);
         mRate = rate;
     }
 }

 // call with lock held
 void SoundChannel::setVolume_l(float leftVolume, float rightVolume)
 {
     mLeftVolume = leftVolume;
     mRightVolume = rightVolume;
     if (mAudioTrack != 0) mAudioTrack->setVolume(leftVolume, rightVolume);
 }

 void SoundChannel::setVolume(float leftVolume, float rightVolume)
 {
     Mutex::Autolock lock(&mLock);
     setVolume_l(leftVolume, rightVolume);
 }

 void SoundChannel::setLoop(int loop)
 {
     Mutex::Autolock lock(&mLock);
     if (mAudioTrack != 0 && mSample.get() != 0) {
         mAudioTrack->setLoop(0, mSample->size()/mNumChannels/((mSample->format() == AudioSystem::PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t)), loop);
         mLoop = loop;
     }
 }

 SoundChannel::~SoundChannel()
 {
     LOGV("SoundChannel destructor");
     if (mAudioTrack) {
         LOGV("stop track");
         mAudioTrack->stop();
         delete mAudioTrack;
     }
     clearNextEvent();
     mSample.clear();
 }

 void SoundChannel::dump()
 {
     LOGV("mState = %d mChannelID=%d, mNumChannels=%d, mPos = %d, mPriority=%d, mLoop=%d",
             mState, mChannelID, mNumChannels, mPos, mPriority, mLoop);
 }

 void SoundEvent::set(const sp<Sample>& sample, int channelID, float leftVolume,
             float rightVolume, int priority, int loop, float rate)
 {
     mSample =sample;
     mChannelID = channelID;
     mLeftVolume = leftVolume;
     mRightVolume = rightVolume;
     mPriority = priority;
     mLoop = loop;
     mRate =rate;
 }

 } // end namespace android
	/*
	* Copyright (C) 2007 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	//#define LOG_NDEBUG 0
	#define LOG_TAG "SoundPool"
	#include <utils/Log.h>

	//#define USE_SHARED_MEM_BUFFER

	// XXX needed for timing latency
	#include <utils/Timers.h>

	#include <sys/resource.h>
	#include <media/AudioTrack.h>
	#include <media/mediaplayer.h>

	#include "SoundPool.h"
	#include "SoundPoolThread.h"

	namespace android
	{

	int kDefaultBufferCount = 4;
	uint32_t kMaxSampleRate = 48000;
	uint32_t kDefaultSampleRate = 44100;
	uint32_t kDefaultFrameCount = 1200;

	SoundPool::SoundPool(jobject soundPoolRef, int maxChannels, int streamType, int srcQuality)
	{
	LOGV("SoundPool constructor: maxChannels=%d, streamType=%d, srcQuality=%d",
	maxChannels, streamType, srcQuality);

	// check limits
	mMaxChannels = maxChannels;
	if (mMaxChannels < 1) {
	mMaxChannels = 1;
	}
	else if (mMaxChannels > 32) {
	mMaxChannels = 32;
	}
	LOGW_IF(maxChannels != mMaxChannels, "App requested %d channels", maxChannels);

	mQuit = false;
	mSoundPoolRef = soundPoolRef;
	mDecodeThread = 0;
	mStreamType = streamType;
	mSrcQuality = srcQuality;
	mAllocated = 0;
	mNextSampleID = 0;
	mNextChannelID = 0;

	mChannelPool = new SoundChannel[mMaxChannels];
	for (int i = 0; i < mMaxChannels; ++i) {
	mChannelPool[i].init(this);
	mChannels.push_back(&mChannelPool[i]);
	}

	// start decode thread
	startThreads();
	}

	SoundPool::~SoundPool()
	{
	LOGV("SoundPool destructor");
	mDecodeThread->quit();
	quit();

	Mutex::Autolock lock(&mLock);
	mChannels.clear();
	if (mChannelPool)
	delete [] mChannelPool;

	// clean up samples
	LOGV("clear samples");
	mSamples.clear();

	if (mDecodeThread)
	delete mDecodeThread;
	}

	void SoundPool::addToRestartList(SoundChannel* channel)
	{
	Mutex::Autolock lock(&mRestartLock);
	mRestart.push_back(channel);
	mCondition.signal();
	}

	int SoundPool::beginThread(void* arg)
	{
	SoundPool* p = (SoundPool*)arg;
	return p->run();
	}

	int SoundPool::run()
	{
	mRestartLock.lock();
	while (!mQuit) {
	mCondition.wait(mRestartLock);
	LOGV("awake");
	if (mQuit) break;

	while (!mRestart.empty()) {
	SoundChannel* channel;
	LOGV("Getting channel from list");
	List<SoundChannel*>::iterator iter = mRestart.begin();
	channel = *iter;
	mRestart.erase(iter);
	if (channel) channel->nextEvent();
	if (mQuit) break;
	}
	}

	mRestart.clear();
	mCondition.signal();
	mRestartLock.unlock();
	LOGV("goodbye");
	return 0;
	}

	void SoundPool::quit()
	{
	mRestartLock.lock();
	mQuit = true;
	mCondition.signal();
	mCondition.wait(mRestartLock);
	LOGV("return from quit");
	mRestartLock.unlock();
	}

	bool SoundPool::startThreads()
	{
	createThread(beginThread, this);
	if (mDecodeThread == NULL)
	mDecodeThread = new SoundPoolThread(this);
	return mDecodeThread != NULL;
	}

	SoundChannel* SoundPool::findChannel(int channelID)
	{
	for (int i = 0; i < mMaxChannels; ++i) {
	if (mChannelPool[i].channelID() == channelID) {
	return &mChannelPool[i];
	}
	}
	return NULL;
	}

	SoundChannel* SoundPool::findNextChannel(int channelID)
	{
	for (int i = 0; i < mMaxChannels; ++i) {
	if (mChannelPool[i].nextChannelID() == channelID) {
	return &mChannelPool[i];
	}
	}
	return NULL;
	}

	int SoundPool::load(const char* path, int priority)
	{
	LOGV("load: path=%s, priority=%d", path, priority);
	Mutex::Autolock lock(&mLock);
	sp<Sample> sample = new Sample(++mNextSampleID, path);
	mSamples.add(sample->sampleID(), sample);
	doLoad(sample);
	return sample->sampleID();
	}

	int SoundPool::load(int fd, int64_t offset, int64_t length, int priority)
	{
	LOGV("load: fd=%d, offset=%lld, length=%lld, priority=%d",
	fd, offset, length, priority);
	Mutex::Autolock lock(&mLock);
	sp<Sample> sample = new Sample(++mNextSampleID, fd, offset, length);
	mSamples.add(sample->sampleID(), sample);
	doLoad(sample);
	return sample->sampleID();
	}

	void SoundPool::doLoad(sp<Sample>& sample)
	{
	LOGV("doLoad: loading sample sampleID=%d", sample->sampleID());
	sample->startLoad();
	mDecodeThread->loadSample(sample->sampleID());
	}

	bool SoundPool::unload(int sampleID)
	{
	LOGV("unload: sampleID=%d", sampleID);
	Mutex::Autolock lock(&mLock);
	return mSamples.removeItem(sampleID);
	}

	int SoundPool::play(int sampleID, float leftVolume, float rightVolume,
	int priority, int loop, float rate)
	{
	LOGV("sampleID=%d, leftVolume=%f, rightVolume=%f, priority=%d, loop=%d, rate=%f",
	sampleID, leftVolume, rightVolume, priority, loop, rate);
	sp<Sample> sample;
	SoundChannel* channel;
	int channelID;

	// scope for lock
	{
	Mutex::Autolock lock(&mLock);

	// is sample ready?
	sample = findSample(sampleID);
	if ((sample == 0) \|\| (sample->state() != Sample::READY)) {
	LOGW(" sample %d not READY", sampleID);
	return 0;
	}

	dump();

	// allocate a channel
	channel = allocateChannel(priority);

	// no channel allocated - return 0
	if (!channel) {
	LOGV("No channel allocated");
	return 0;
	}

	channelID = ++mNextChannelID;
	}

	LOGV("channel state = %d", channel->state());
	channel->play(sample, channelID, leftVolume, rightVolume, priority, loop, rate);
	return channelID;
	}

	SoundChannel* SoundPool::allocateChannel(int priority)
	{
	List<SoundChannel*>::iterator iter;
	SoundChannel* channel = NULL;

	// allocate a channel
	if (!mChannels.empty()) {
	iter = mChannels.begin();
	if (priority >= (*iter)->priority()) {
	channel = *iter;
	mChannels.erase(iter);
	LOGV("Allocated active channel");
	}
	}

	// update priority and put it back in the list
	if (channel) {
	channel->setPriority(priority);
	for (iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
	if (priority < (*iter)->priority()) {
	break;
	}
	}
	mChannels.insert(iter, channel);
	}
	return channel;
	}

	// move a channel from its current position to the front of the list
	void SoundPool::moveToFront(SoundChannel* channel)
	{
	for (List<SoundChannel*>::iterator iter = mChannels.begin(); iter != mChannels.end(); ++iter) {
	if (*iter == channel) {
	mChannels.erase(iter);
	mChannels.push_front(channel);
	break;
	}
	}
	}

	void SoundPool::pause(int channelID)
	{
	LOGV("pause(%d)", channelID);
	Mutex::Autolock lock(&mLock);
	SoundChannel* channel = findChannel(channelID);
	if (channel) {
	channel->pause();
	}
	}

	void SoundPool::resume(int channelID)
	{
	LOGV("resume(%d)", channelID);
	Mutex::Autolock lock(&mLock);
	SoundChannel* channel = findChannel(channelID);
	if (channel) {
	channel->resume();
	}
	}

	void SoundPool::stop(int channelID)
	{
	LOGV("stop(%d)", channelID);
	Mutex::Autolock lock(&mLock);
	SoundChannel* channel = findChannel(channelID);
	if (channel) {
	channel->stop();
	} else {
	channel = findNextChannel(channelID);
	if (channel)
	channel->clearNextEvent();
	}
	}

	void SoundPool::setVolume(int channelID, float leftVolume, float rightVolume)
	{
	Mutex::Autolock lock(&mLock);
	SoundChannel* channel = findChannel(channelID);
	if (channel) {
	channel->setVolume(leftVolume, rightVolume);
	}
	}

	void SoundPool::setPriority(int channelID, int priority)
	{
	LOGV("setPriority(%d, %d)", channelID, priority);
	Mutex::Autolock lock(&mLock);
	SoundChannel* channel = findChannel(channelID);
	if (channel) {
	channel->setPriority(priority);
	}
	}

	void SoundPool::setLoop(int channelID, int loop)
	{
	LOGV("setLoop(%d, %d)", channelID, loop);
	Mutex::Autolock lock(&mLock);
	SoundChannel* channel = findChannel(channelID);
	if (channel) {
	channel->setLoop(loop);
	}
	}

	void SoundPool::setRate(int channelID, float rate)
	{
	LOGV("setRate(%d, %f)", channelID, rate);
	Mutex::Autolock lock(&mLock);
	SoundChannel* channel = findChannel(channelID);
	if (channel) {
	channel->setRate(rate);
	}
	}

	// call with lock held
	void SoundPool::done(SoundChannel* channel)
	{
	LOGV("done(%d)", channel->channelID());

	// if "stolen", play next event
	if (channel->nextChannelID() != 0) {
	LOGV("add to restart list");
	addToRestartList(channel);
	}

	// return to idle state
	else {
	LOGV("move to front");
	moveToFront(channel);
	}
	}

	void SoundPool::dump()
	{
	for (int i = 0; i < mMaxChannels; ++i) {
	mChannelPool[i].dump();
	}
	}


	Sample::Sample(int sampleID, const char* url)
	{
	init();
	mSampleID = sampleID;
	mUrl = strdup(url);
	LOGV("create sampleID=%d, url=%s", mSampleID, mUrl);
	}

	Sample::Sample(int sampleID, int fd, int64_t offset, int64_t length)
	{
	init();
	mSampleID = sampleID;
	mFd = dup(fd);
	mOffset = offset;
	mLength = length;
	LOGV("create sampleID=%d, fd=%d, offset=%lld, length=%lld", mSampleID, mFd, mLength, mOffset);
	}

	void Sample::init()
	{
	mData = 0;
	mSize = 0;
	mRefCount = 0;
	mSampleID = 0;
	mState = UNLOADED;
	mFd = -1;
	mOffset = 0;
	mLength = 0;
	mUrl = 0;
	}

	Sample::~Sample()
	{
	LOGV("Sample::destructor sampleID=%d, fd=%d", mSampleID, mFd);
	if (mFd > 0) {
	LOGV("close(%d)", mFd);
	::close(mFd);
	}
	mData.clear();
	delete mUrl;
	}

	void Sample::doLoad()
	{
	uint32_t sampleRate;
	int numChannels;
	int format;
	sp<IMemory> p;
	LOGV("Start decode");
	if (mUrl) {
	p = MediaPlayer::decode(mUrl, &sampleRate, &numChannels, &format);
	} else {
	p = MediaPlayer::decode(mFd, mOffset, mLength, &sampleRate, &numChannels, &format);
	LOGV("close(%d)", mFd);
	::close(mFd);
	mFd = -1;
	}
	if (p == 0) {
	LOGE("Unable to load sample: %s", mUrl);
	return;
	}
	LOGV("pointer = %p, size = %u, sampleRate = %u, numChannels = %d",
	p->pointer(), p->size(), sampleRate, numChannels);

	if (sampleRate > kMaxSampleRate) {
	LOGE("Sample rate (%u) out of range", sampleRate);
	return;
	}

	if ((numChannels < 1) \|\| (numChannels > 2)) {
	LOGE("Sample channel count (%d) out of range", numChannels);
	return;
	}

	//_dumpBuffer(p->pointer(), p->size());
	uint8_t* q = static_cast<uint8_t*>(p->pointer()) + p->size() - 10;
	//_dumpBuffer(q, 10, 10, false);

	mData = p;
	mSize = p->size();
	mSampleRate = sampleRate;
	mNumChannels = numChannels;
	mFormat = format;
	mState = READY;
	}


	void SoundChannel::init(SoundPool* soundPool)
	{
	mSoundPool = soundPool;
	}

	void SoundChannel::play(const sp<Sample>& sample, int nextChannelID, float leftVolume,
	float rightVolume, int priority, int loop, float rate)
	{
	AudioTrack* oldTrack;

	LOGV("play %p: sampleID=%d, channelID=%d, leftVolume=%f, rightVolume=%f, priority=%d, loop=%d, rate=%f",
	this, sample->sampleID(), nextChannelID, leftVolume, rightVolume, priority, loop, rate);

	// if not idle, this voice is being stolen
	if (mState != IDLE) {
	LOGV("channel %d stolen - event queued for channel %d", channelID(), nextChannelID);
	mNextEvent.set(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
	stop();
	return;
	}

	// initialize track
	int afFrameCount;
	int afSampleRate;
	int streamType = mSoundPool->streamType();
	if (AudioSystem::getOutputFrameCount(&afFrameCount, streamType) != NO_ERROR) {
	afFrameCount = kDefaultFrameCount;
	}
	if (AudioSystem::getOutputSamplingRate(&afSampleRate, streamType) != NO_ERROR) {
	afSampleRate = kDefaultSampleRate;
	}
	int numChannels = sample->numChannels();
	uint32_t sampleRate = uint32_t(float(sample->sampleRate()) * rate + 0.5);
	uint32_t totalFrames = (kDefaultBufferCount * afFrameCount * sampleRate) / afSampleRate;
	uint32_t bufferFrames = (totalFrames + (kDefaultBufferCount - 1)) / kDefaultBufferCount;
	uint32_t frameCount = 0;

	if (loop) {
	frameCount = sample->size()/numChannels/((sample->format() == AudioSystem::PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
	}

	#ifndef USE_SHARED_MEM_BUFFER
	// Ensure minimum audio buffer size in case of short looped sample
	if(frameCount < totalFrames) {
	frameCount = totalFrames;
	}
	#endif

	AudioTrack* newTrack;

	// mToggle toggles each time a track is started on a given channel.
	// The toggle is concatenated with the SoundChannel address and passed to AudioTrack
	// as callback user data. This enables the detection of callbacks received from the old
	// audio track while the new one is being started and avoids processing them with
	// wrong audio audio buffer size (mAudioBufferSize)
	unsigned long toggle = mToggle ^ 1;
	void userData = (void )((unsigned long)this \| toggle);
	uint32_t channels = (numChannels == 2) ? AudioSystem::CHANNEL_OUT_STEREO : AudioSystem::CHANNEL_OUT_MONO;

	#ifdef USE_SHARED_MEM_BUFFER
	newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
	channels, sample->getIMemory(), 0, callback, userData);
	#else
	newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
	channels, frameCount, 0, callback, userData, bufferFrames);
	#endif
	if (newTrack->initCheck() != NO_ERROR) {
	LOGE("Error creating AudioTrack");
	delete newTrack;
	return;
	}
	LOGV("setVolume %p", newTrack);
	newTrack->setVolume(leftVolume, rightVolume);
	newTrack->setLoop(0, frameCount, loop);

	{
	Mutex::Autolock lock(&mLock);
	// From now on, AudioTrack callbacks recevieved with previous toggle value will be ignored.
	mToggle = toggle;
	oldTrack = mAudioTrack;
	mAudioTrack = newTrack;
	mPos = 0;
	mSample = sample;
	mChannelID = nextChannelID;
	mPriority = priority;
	mLoop = loop;
	mLeftVolume = leftVolume;
	mRightVolume = rightVolume;
	mNumChannels = numChannels;
	mRate = rate;
	clearNextEvent();
	mState = PLAYING;
	mAudioTrack->start();
	mAudioBufferSize = newTrack->frameCount()*newTrack->frameSize();
	}

	LOGV("delete oldTrack %p", oldTrack);
	delete oldTrack;
	}

	void SoundChannel::nextEvent()
	{
	sp<Sample> sample;
	int nextChannelID;
	float leftVolume;
	float rightVolume;
	int priority;
	int loop;
	float rate;

	// check for valid event
	{
	Mutex::Autolock lock(&mLock);
	nextChannelID = mNextEvent.channelID();
	if (nextChannelID == 0) {
	LOGV("stolen channel has no event");
	return;
	}

	sample = mNextEvent.sample();
	leftVolume = mNextEvent.leftVolume();
	rightVolume = mNextEvent.rightVolume();
	priority = mNextEvent.priority();
	loop = mNextEvent.loop();
	rate = mNextEvent.rate();
	}

	LOGV("Starting stolen channel %d -> %d", channelID(), nextChannelID);
	play(sample, nextChannelID, leftVolume, rightVolume, priority, loop, rate);
	}

	void SoundChannel::callback(int event, void* user, void *info)
	{
	unsigned long toggle = (unsigned long)user & 1;
	SoundChannel* channel = static_cast<SoundChannel>((void )((unsigned long)user & ~1));

	if (channel->mToggle != toggle) {
	LOGV("callback with wrong toggle");
	return;
	}
	channel->process(event, info);
	}

	void SoundChannel::process(int event, void *info)
	{
	//LOGV("process(%d)", mChannelID);
	sp<Sample> sample = mSample;

	// LOGV("SoundChannel::process event %d", event);

	if (event == AudioTrack::EVENT_MORE_DATA) {
	AudioTrack::Buffer* b = static_cast<AudioTrack::Buffer *>(info);

	// check for stop state
	if (b->size == 0) return;

	if (sample != 0) {
	// fill buffer
	uint8_t* q = (uint8_t*) b->i8;
	size_t count = 0;

	if (mPos < (int)sample->size()) {
	uint8_t* p = sample->data() + mPos;
	count = sample->size() - mPos;
	if (count > b->size) {
	count = b->size;
	}
	memcpy(q, p, count);
	LOGV("fill: q=%p, p=%p, mPos=%u, b->size=%u, count=%d", q, p, mPos, b->size, count);
	} else if (mPos < mAudioBufferSize) {
	count = mAudioBufferSize - mPos;
	if (count > b->size) {
	count = b->size;
	}
	memset(q, 0, count);
	LOGV("fill extra: q=%p, mPos=%u, b->size=%u, count=%d", q, mPos, b->size, count);
	}

	mPos += count;
	b->size = count;
	//LOGV("buffer=%p, [0]=%d", b->i16, b->i16[0]);
	}
	} else if (event == AudioTrack::EVENT_UNDERRUN) {
	LOGV("stopping track");
	stop();
	} else if (event == AudioTrack::EVENT_LOOP_END) {
	LOGV("End loop: %d", (int )info);
	}
	}


	// call with lock held
	void SoundChannel::stop_l()
	{
	if (mState != IDLE) {
	setVolume_l(0, 0);
	LOGV("stop");
	mAudioTrack->stop();
	mSample.clear();
	mState = IDLE;
	mPriority = IDLE_PRIORITY;
	}
	}

	void SoundChannel::stop()
	{
	{
	Mutex::Autolock lock(&mLock);
	stop_l();
	}
	mSoundPool->done(this);
	}

	//FIXME: Pause is a little broken right now
	void SoundChannel::pause()
	{
	Mutex::Autolock lock(&mLock);
	if (mState == PLAYING) {
	LOGV("pause track");
	mState = PAUSED;
	mAudioTrack->pause();
	}
	}

	void SoundChannel::resume()
	{
	Mutex::Autolock lock(&mLock);
	if (mState == PAUSED) {
	LOGV("resume track");
	mState = PLAYING;
	mAudioTrack->start();
	}
	}

	void SoundChannel::setRate(float rate)
	{
	Mutex::Autolock lock(&mLock);
	if (mAudioTrack != 0 && mSample.get() != 0) {
	uint32_t sampleRate = uint32_t(float(mSample->sampleRate()) * rate + 0.5);
	mAudioTrack->setSampleRate(sampleRate);
	mRate = rate;
	}
	}

	// call with lock held
	void SoundChannel::setVolume_l(float leftVolume, float rightVolume)
	{
	mLeftVolume = leftVolume;
	mRightVolume = rightVolume;
	if (mAudioTrack != 0) mAudioTrack->setVolume(leftVolume, rightVolume);
	}

	void SoundChannel::setVolume(float leftVolume, float rightVolume)
	{
	Mutex::Autolock lock(&mLock);
	setVolume_l(leftVolume, rightVolume);
	}

	void SoundChannel::setLoop(int loop)
	{
	Mutex::Autolock lock(&mLock);
	if (mAudioTrack != 0 && mSample.get() != 0) {
	mAudioTrack->setLoop(0, mSample->size()/mNumChannels/((mSample->format() == AudioSystem::PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t)), loop);
	mLoop = loop;
	}
	}

	SoundChannel::~SoundChannel()
	{
	LOGV("SoundChannel destructor");
	if (mAudioTrack) {
	LOGV("stop track");
	mAudioTrack->stop();
	delete mAudioTrack;
	}
	clearNextEvent();
	mSample.clear();
	}

	void SoundChannel::dump()
	{
	LOGV("mState = %d mChannelID=%d, mNumChannels=%d, mPos = %d, mPriority=%d, mLoop=%d",
	mState, mChannelID, mNumChannels, mPos, mPriority, mLoop);
	}

	void SoundEvent::set(const sp<Sample>& sample, int channelID, float leftVolume,
	float rightVolume, int priority, int loop, float rate)
	{
	mSample =sample;
	mChannelID = channelID;
	mLeftVolume = leftVolume;
	mRightVolume = rightVolume;
	mPriority = priority;
	mLoop = loop;
	mRate =rate;
	}

	} // end namespace android