M7350v1_en_gpl

base/media/jni/soundpool/Android.mk

@@ -0,0 +1,19 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	android_media_SoundPool.cpp \
+	SoundPool.cpp \
+	SoundPoolThread.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	libutils \
+	libbinder \
+	libandroid_runtime \
+	libnativehelper \
+	libmedia
+
+LOCAL_MODULE:= libsoundpool
+
+include $(BUILD_SHARED_LIBRARY)

base/media/jni/soundpool/NOTICE

@@ -0,0 +1,190 @@
+
+   Copyright (c) 2005-2008, 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.
+
+   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.
+
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      designated in writing by the copyright owner as "Not a Contribution."
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
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+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
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+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
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+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+
+   7. Disclaimer of Warranty. Unless required by applicable law or
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+
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+      whether in tort (including negligence), contract, or otherwise,
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+
+   END OF TERMS AND CONDITIONS
+

base/media/jni/soundpool/SoundPool.cpp

@@ -0,0 +1,905 @@
+/*
+ * 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(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;
+    mDecodeThread = 0;
+    mStreamType = streamType;
+    mSrcQuality = srcQuality;
+    mAllocated = 0;
+    mNextSampleID = 0;
+    mNextChannelID = 0;
+
+    mCallback = 0;
+    mUserData = 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);
+    if (!mQuit) {
+    mRestart.push_back(channel);
+    mCondition.signal();
+}
+}
+
+void SoundPool::addToStopList(SoundChannel* channel)
+{
+    Mutex::Autolock lock(&mRestartLock);
+    if (!mQuit) {
+        mStop.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 (!mStop.empty()) {
+            SoundChannel* channel;
+            LOGV("Getting channel from stop list");
+            List<SoundChannel* >::iterator iter = mStop.begin();
+            channel = *iter;
+            mStop.erase(iter);
+            mRestartLock.unlock();
+            if (channel != 0) {
+                Mutex::Autolock lock(&mLock);
+                channel->stop();
+            }
+            mRestartLock.lock();
+            if (mQuit) break;
+        }
+
+        while (!mRestart.empty()) {
+            SoundChannel* channel;
+            LOGV("Getting channel from list");
+            List<SoundChannel*>::iterator iter = mRestart.begin();
+            channel = *iter;
+            mRestart.erase(iter);
+            mRestartLock.unlock();
+            if (channel != 0) {
+                Mutex::Autolock lock(&mLock);
+                channel->nextEvent();
+            }
+            mRestartLock.lock();
+            if (mQuit) break;
+        }
+    }
+
+    mStop.clear();
+    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()
+{
+    createThreadEtc(beginThread, this, "SoundPool");
+    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("play 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;
+
+        Mutex::Autolock lock(&mLock);
+
+    if (mQuit) {
+        return 0;
+    }
+        // 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_l(priority);
+
+        // no channel allocated - return 0
+        if (!channel) {
+            LOGV("No channel allocated");
+            return 0;
+        }
+
+        channelID = ++mNextChannelID;
+
+    LOGV("play channel %p state = %d", channel, channel->state());
+    channel->play(sample, channelID, leftVolume, rightVolume, priority, loop, rate);
+    return channelID;
+}
+
+SoundChannel* SoundPool::allocateChannel_l(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_l(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::autoPause()
+{
+    LOGV("autoPause()");
+    Mutex::Autolock lock(&mLock);
+    for (int i = 0; i < mMaxChannels; ++i) {
+        SoundChannel* channel = &mChannelPool[i];
+        channel->autoPause();
+    }
+}
+
+void SoundPool::resume(int channelID)
+{
+    LOGV("resume(%d)", channelID);
+    Mutex::Autolock lock(&mLock);
+    SoundChannel* channel = findChannel(channelID);
+    if (channel) {
+        channel->resume();
+    }
+}
+
+void SoundPool::autoResume()
+{
+    LOGV("autoResume()");
+    Mutex::Autolock lock(&mLock);
+    for (int i = 0; i < mMaxChannels; ++i) {
+        SoundChannel* channel = &mChannelPool[i];
+        channel->autoResume();
+    }
+}
+
+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_l(SoundChannel* channel)
+{
+    LOGV("done_l(%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_l(channel);
+    }
+}
+
+void SoundPool::setCallback(SoundPoolCallback* callback, void* user)
+{
+    Mutex::Autolock lock(&mCallbackLock);
+    mCallback = callback;
+    mUserData = user;
+}
+
+void SoundPool::notify(SoundPoolEvent event)
+{
+    Mutex::Autolock lock(&mCallbackLock);
+    if (mCallback != NULL) {
+        mCallback(event, this, mUserData);
+    }
+}
+
+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;
+}
+
+status_t 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 -1;
+    }
+    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 - 1;
+    }
+
+    if ((numChannels < 1) || (numChannels > 2)) {
+        LOGE("Sample channel count (%d) out of range", numChannels);
+        return - 1;
+    }
+
+    //_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;
+    return 0;
+}
+
+
+void SoundChannel::init(SoundPool* soundPool)
+{
+    mSoundPool = soundPool;
+}
+
+// call with sound pool lock held
+void SoundChannel::play(const sp<Sample>& sample, int nextChannelID, float leftVolume,
+        float rightVolume, int priority, int loop, float rate)
+{
+    AudioTrack* oldTrack;
+    AudioTrack* newTrack;
+    status_t status;
+
+    { // scope for the lock
+        Mutex::Autolock lock(&mLock);
+
+        LOGV("SoundChannel::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_l();
+        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
+
+    // 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;
+
+        // do not create a new audio track if current track is compatible with sample parameters
+#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
+        oldTrack = mAudioTrack;
+        status = newTrack->initCheck();
+        if (status != NO_ERROR) {
+        LOGE("Error creating AudioTrack");
+            goto exit;
+    }
+    LOGV("setVolume %p", newTrack);
+    newTrack->setVolume(leftVolume, rightVolume);
+    newTrack->setLoop(0, frameCount, loop);
+
+        // From now on, AudioTrack callbacks recevieved with previous toggle value will be ignored.
+        mToggle = toggle;
+        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();
+    }
+
+exit:
+    LOGV("delete oldTrack %p", oldTrack);
+    delete oldTrack;
+    if (status != NO_ERROR) {
+        delete newTrack;
+        mAudioTrack = NULL;
+    }
+}
+
+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)
+{
+    SoundChannel* channel = static_cast<SoundChannel*>((void *)((unsigned long)user & ~1));
+    
+    channel->process(event, info, (unsigned long)user & 1);
+}
+
+void SoundChannel::process(int event, void *info, unsigned long toggle)
+{
+    //LOGV("process(%d)", mChannelID);
+
+    Mutex::Autolock lock(&mLock);
+
+    AudioTrack::Buffer* b = NULL;
+    if (event == AudioTrack::EVENT_MORE_DATA) {
+       b = static_cast<AudioTrack::Buffer *>(info);
+    }
+
+    if (mToggle != toggle) {
+        LOGV("process wrong toggle %p channel %d", this, mChannelID);
+        if (b != NULL) {
+            b->size = 0;
+        }
+        return;
+    }
+
+    sp<Sample> sample = mSample;
+
+//    LOGV("SoundChannel::process event %d", event);
+
+    if (event == AudioTrack::EVENT_MORE_DATA) {
+
+        // check for stop state
+        if (b->size == 0) return;
+
+        if (mState == IDLE) {
+            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("process %p channel %d EVENT_UNDERRUN", this, mChannelID);
+        mSoundPool->addToStopList(this);
+    } else if (event == AudioTrack::EVENT_LOOP_END) {
+        LOGV("End loop %p channel %d count %d", this, mChannelID, *(int *)info);
+    }
+}
+
+
+// call with lock held
+bool SoundChannel::doStop_l()
+{
+    if (mState != IDLE) {
+        setVolume_l(0, 0);
+        LOGV("stop");
+        mAudioTrack->stop();
+        mSample.clear();
+        mState = IDLE;
+        mPriority = IDLE_PRIORITY;
+        return true;
+    }
+    return false;
+}
+
+// call with lock held and sound pool lock held
+void SoundChannel::stop_l()
+{
+    if (doStop_l()) {
+        mSoundPool->done_l(this);
+    }
+}
+
+// call with sound pool lock held
+void SoundChannel::stop()
+{
+    bool stopped;
+    {
+        Mutex::Autolock lock(&mLock);
+        stopped = doStop_l();
+    }
+
+    if (stopped) {
+        mSoundPool->done_l(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::autoPause()
+{
+    Mutex::Autolock lock(&mLock);
+    if (mState == PLAYING) {
+        LOGV("pause track");
+        mState = PAUSED;
+        mAutoPaused = true;
+        mAudioTrack->pause();
+    }
+}
+
+void SoundChannel::resume()
+{
+    Mutex::Autolock lock(&mLock);
+    if (mState == PAUSED) {
+        LOGV("resume track");
+        mState = PLAYING;
+        mAutoPaused = false;
+        mAudioTrack->start();
+    }
+}
+
+void SoundChannel::autoResume()
+{
+    Mutex::Autolock lock(&mLock);
+    if (mAutoPaused && (mState == PAUSED)) {
+        LOGV("resume track");
+        mState = PLAYING;
+        mAutoPaused = false;
+        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) {
+        uint32_t loopEnd = mSample->size()/mNumChannels/
+            ((mSample->format() == AudioSystem::PCM_16_BIT) ? sizeof(int16_t) : sizeof(uint8_t));
+        mAudioTrack->setLoop(0, loopEnd, loop);
+        mLoop = loop;
+    }
+}
+
+SoundChannel::~SoundChannel()
+{
+    LOGV("SoundChannel destructor %p", this);
+    {
+        Mutex::Autolock lock(&mLock);
+    clearNextEvent();
+        doStop_l();
+    }
+    // do not call AudioTrack destructor with mLock held as it will wait for the AudioTrack
+    // callback thread to exit which may need to execute process() and acquire the mLock.
+    delete mAudioTrack;
+}
+
+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

base/media/jni/soundpool/SoundPool.h

@@ -0,0 +1,238 @@
+/*
+ * 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.
+ */
+
+#ifndef SOUNDPOOL_H_
+#define SOUNDPOOL_H_
+
+#include <utils/threads.h>
+#include <utils/List.h>
+#include <utils/Vector.h>
+#include <utils/KeyedVector.h>
+#include <media/AudioTrack.h>
+
+namespace android {
+
+static const int IDLE_PRIORITY = -1;
+
+// forward declarations
+class SoundEvent;
+class SoundPoolThread;
+class SoundPool;
+
+// for queued events
+class SoundPoolEvent {
+public:
+    SoundPoolEvent(int msg, int arg1=0, int arg2=0) :
+        mMsg(msg), mArg1(arg1), mArg2(arg2) {}
+    int         mMsg;
+    int         mArg1;
+    int         mArg2;
+    enum MessageType { INVALID, SAMPLE_LOADED };
+};
+
+// callback function prototype
+typedef void SoundPoolCallback(SoundPoolEvent event, SoundPool* soundPool, void* user);
+
+// tracks samples used by application
+class Sample  : public RefBase {
+public:
+    enum sample_state { UNLOADED, LOADING, READY, UNLOADING };
+    Sample(int sampleID, const char* url);
+    Sample(int sampleID, int fd, int64_t offset, int64_t length);
+    ~Sample();
+    int sampleID() { return mSampleID; }
+    int numChannels() { return mNumChannels; }
+    int sampleRate() { return mSampleRate; }
+    int format() { return mFormat; }
+    size_t size() { return mSize; }
+    int state() { return mState; }
+    uint8_t* data() { return static_cast<uint8_t*>(mData->pointer()); }
+    status_t doLoad();
+    void startLoad() { mState = LOADING; }
+    sp<IMemory> getIMemory() { return mData; }
+
+    // hack
+    void init(int numChannels, int sampleRate, int format, size_t size, sp<IMemory> data ) {
+        mNumChannels = numChannels; mSampleRate = sampleRate; mFormat = format; mSize = size; mData = data; }
+
+private:
+    void init();
+
+    size_t              mSize;
+    volatile int32_t    mRefCount;
+    uint16_t            mSampleID;
+    uint16_t            mSampleRate;
+    uint8_t             mState : 3;
+    uint8_t             mNumChannels : 2;
+    uint8_t             mFormat : 2;
+    int                 mFd;
+    int64_t             mOffset;
+    int64_t             mLength;
+    char*               mUrl;
+    sp<IMemory>         mData;
+};
+
+// stores pending events for stolen channels
+class SoundEvent
+{
+public:
+    SoundEvent() : mChannelID(0), mLeftVolume(0), mRightVolume(0),
+            mPriority(IDLE_PRIORITY), mLoop(0), mRate(0) {}
+    void set(const sp<Sample>& sample, int channelID, float leftVolume,
+            float rightVolume, int priority, int loop, float rate);
+    sp<Sample>      sample() { return mSample; }
+    int             channelID() { return mChannelID; }
+    float           leftVolume() { return mLeftVolume; }
+    float           rightVolume() { return mRightVolume; }
+    int             priority() { return mPriority; }
+    int             loop() { return mLoop; }
+    float           rate() { return mRate; }
+    void            clear() { mChannelID = 0; mSample.clear(); }
+
+protected:
+    sp<Sample>      mSample;
+    int             mChannelID;
+    float           mLeftVolume;
+    float           mRightVolume;
+    int             mPriority;
+    int             mLoop;
+    float           mRate;
+};
+
+// for channels aka AudioTracks
+class SoundChannel : public SoundEvent {
+public:
+    enum state { IDLE, RESUMING, STOPPING, PAUSED, PLAYING };
+    SoundChannel() : mAudioTrack(0), mState(IDLE), mNumChannels(1),
+            mPos(0), mToggle(0), mAutoPaused(false) {}
+    ~SoundChannel();
+    void init(SoundPool* soundPool);
+    void play(const sp<Sample>& sample, int channelID, float leftVolume, float rightVolume,
+            int priority, int loop, float rate);
+    void setVolume_l(float leftVolume, float rightVolume);
+    void setVolume(float leftVolume, float rightVolume);
+    void stop_l();
+    void stop();
+    void pause();
+    void autoPause();
+    void resume();
+    void autoResume();
+    void setRate(float rate);
+    int state() { return mState; }
+    void setPriority(int priority) { mPriority = priority; }
+    void setLoop(int loop);
+    int numChannels() { return mNumChannels; }
+    void clearNextEvent() { mNextEvent.clear(); }
+    void nextEvent();
+    int nextChannelID() { return mNextEvent.channelID(); }
+    void dump();
+
+private:
+    static void callback(int event, void* user, void *info);
+    void process(int event, void *info, unsigned long toggle);
+    bool doStop_l();
+
+    SoundPool*          mSoundPool;
+    AudioTrack*         mAudioTrack;
+    SoundEvent          mNextEvent;
+    Mutex               mLock;
+    int                 mState;
+    int                 mNumChannels;
+    int                 mPos;
+    int                 mAudioBufferSize;
+    unsigned long       mToggle;
+    bool                mAutoPaused;
+};
+
+// application object for managing a pool of sounds
+class SoundPool {
+    friend class SoundPoolThread;
+    friend class SoundChannel;
+public:
+    SoundPool(int maxChannels, int streamType, int srcQuality);
+    ~SoundPool();
+    int load(const char* url, int priority);
+    int load(int fd, int64_t offset, int64_t length, int priority);
+    bool unload(int sampleID);
+    int play(int sampleID, float leftVolume, float rightVolume, int priority,
+            int loop, float rate);
+    void pause(int channelID);
+    void autoPause();
+    void resume(int channelID);
+    void autoResume();
+    void stop(int channelID);
+    void setVolume(int channelID, float leftVolume, float rightVolume);
+    void setPriority(int channelID, int priority);
+    void setLoop(int channelID, int loop);
+    void setRate(int channelID, float rate);
+    int streamType() const { return mStreamType; }
+    int srcQuality() const { return mSrcQuality; }
+
+    // called from SoundPoolThread
+    void sampleLoaded(int sampleID);
+
+    // called from AudioTrack thread
+    void done_l(SoundChannel* channel);
+
+    // callback function
+    void setCallback(SoundPoolCallback* callback, void* user);
+    void* getUserData() { return mUserData; }
+
+private:
+    SoundPool() {} // no default constructor
+    bool startThreads();
+    void doLoad(sp<Sample>& sample);
+    sp<Sample> findSample(int sampleID) { return mSamples.valueFor(sampleID); }
+    SoundChannel* findChannel (int channelID);
+    SoundChannel* findNextChannel (int channelID);
+    SoundChannel* allocateChannel_l(int priority);
+    void moveToFront_l(SoundChannel* channel);
+    void notify(SoundPoolEvent event);
+    void dump();
+
+    // restart thread
+    void addToRestartList(SoundChannel* channel);
+    void addToStopList(SoundChannel* channel);
+    static int beginThread(void* arg);
+    int run();
+    void quit();
+
+    Mutex                   mLock;
+    Mutex                   mRestartLock;
+    Condition               mCondition;
+    SoundPoolThread*        mDecodeThread;
+    SoundChannel*           mChannelPool;
+    List<SoundChannel*>     mChannels;
+    List<SoundChannel*>     mRestart;
+    List<SoundChannel*>     mStop;
+    DefaultKeyedVector< int, sp<Sample> >   mSamples;
+    int                     mMaxChannels;
+    int                     mStreamType;
+    int                     mSrcQuality;
+    int                     mAllocated;
+    int                     mNextSampleID;
+    int                     mNextChannelID;
+    bool                    mQuit;
+
+    // callback
+    Mutex                   mCallbackLock;
+    SoundPoolCallback*      mCallback;
+    void*                   mUserData;
+};
+
+} // end namespace android
+
+#endif /*SOUNDPOOL_H_*/

base/media/jni/soundpool/SoundPoolThread.cpp

@@ -0,0 +1,114 @@
+/*
+ * 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 "SoundPoolThread"
+#include "utils/Log.h"
+
+#include "SoundPoolThread.h"
+
+namespace android {
+
+void SoundPoolThread::write(SoundPoolMsg msg) {
+    Mutex::Autolock lock(&mLock);
+    while (mMsgQueue.size() >= maxMessages) {
+        mCondition.wait(mLock);
+    }
+
+    // if thread is quitting, don't add to queue
+    if (mRunning) {
+        mMsgQueue.push(msg);
+        mCondition.signal();
+    }
+}
+
+const SoundPoolMsg SoundPoolThread::read() {
+    Mutex::Autolock lock(&mLock);
+    while (mMsgQueue.size() == 0) {
+        mCondition.wait(mLock);
+    }
+    SoundPoolMsg msg = mMsgQueue[0];
+    mMsgQueue.removeAt(0);
+    mCondition.signal();
+    return msg;
+}
+
+void SoundPoolThread::quit() {
+    Mutex::Autolock lock(&mLock);
+    if (mRunning) {
+        mRunning = false;
+        mMsgQueue.clear();
+        mMsgQueue.push(SoundPoolMsg(SoundPoolMsg::KILL, 0));
+        mCondition.signal();
+        mCondition.wait(mLock);
+    }
+    LOGV("return from quit");
+}
+
+SoundPoolThread::SoundPoolThread(SoundPool* soundPool) :
+    mSoundPool(soundPool)
+{
+    mMsgQueue.setCapacity(maxMessages);
+    if (createThreadEtc(beginThread, this, "SoundPoolThread")) {
+        mRunning = true;
+    }
+}
+
+SoundPoolThread::~SoundPoolThread()
+{
+    quit();
+}
+
+int SoundPoolThread::beginThread(void* arg) {
+    LOGV("beginThread");
+    SoundPoolThread* soundPoolThread = (SoundPoolThread*)arg;
+    return soundPoolThread->run();
+}
+
+int SoundPoolThread::run() {
+    LOGV("run");
+    for (;;) {
+        SoundPoolMsg msg = read();
+        LOGV("Got message m=%d, mData=%d", msg.mMessageType, msg.mData);
+        switch (msg.mMessageType) {
+        case SoundPoolMsg::KILL:
+            LOGV("goodbye");
+            return NO_ERROR;
+        case SoundPoolMsg::LOAD_SAMPLE:
+            doLoadSample(msg.mData);
+            break;
+        default:
+            LOGW("run: Unrecognized message %d\n",
+                    msg.mMessageType);
+            break;
+        }
+    }
+}
+
+void SoundPoolThread::loadSample(int sampleID) {
+    write(SoundPoolMsg(SoundPoolMsg::LOAD_SAMPLE, sampleID));
+}
+
+void SoundPoolThread::doLoadSample(int sampleID) {
+    sp <Sample> sample = mSoundPool->findSample(sampleID);
+    status_t status = -1;
+    if (sample != 0) {
+        status = sample->doLoad();
+    }
+    mSoundPool->notify(SoundPoolEvent(SoundPoolEvent::SAMPLE_LOADED, sampleID, status));
+}
+
+} // end namespace android

base/media/jni/soundpool/SoundPoolThread.h

@@ -0,0 +1,66 @@
+/*
+ * 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.
+ */
+
+#ifndef SOUNDPOOLTHREAD_H_
+#define SOUNDPOOLTHREAD_H_
+
+#include <utils/threads.h>
+#include <utils/Vector.h>
+#include <media/AudioTrack.h>
+
+#include "SoundPool.h"
+
+namespace android {
+
+class SoundPoolMsg {
+public:
+    enum MessageType { INVALID, KILL, LOAD_SAMPLE };
+    SoundPoolMsg() : mMessageType(INVALID), mData(0) {}
+    SoundPoolMsg(MessageType MessageType, int data) :
+        mMessageType(MessageType), mData(data) {}
+    uint16_t         mMessageType;
+    uint16_t         mData;
+};
+
+/*
+ * This class handles background requests from the SoundPool
+ */
+class SoundPoolThread {
+public:
+    SoundPoolThread(SoundPool* SoundPool);
+    ~SoundPoolThread();
+    void loadSample(int sampleID);
+    void quit();
+    void write(SoundPoolMsg msg);
+
+private:
+    static const size_t maxMessages = 5;
+
+    static int beginThread(void* arg);
+    int run();
+    void doLoadSample(int sampleID);
+    const SoundPoolMsg read();
+
+    Mutex                   mLock;
+    Condition               mCondition;
+    Vector<SoundPoolMsg>    mMsgQueue;
+    SoundPool*              mSoundPool;
+    bool                    mRunning;
+};
+
+} // end namespace android
+
+#endif /*SOUNDPOOLTHREAD_H_*/

base/media/jni/soundpool/android_media_SoundPool.cpp

@@ -0,0 +1,327 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+#include <stdio.h>
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "SoundPool-JNI"
+
+#include <utils/Log.h>
+#include <nativehelper/jni.h>
+#include <nativehelper/JNIHelp.h>
+#include <android_runtime/AndroidRuntime.h>
+#include "SoundPool.h"
+
+using namespace android;
+
+static struct fields_t {
+    jfieldID    mNativeContext;
+    jmethodID   mPostEvent;
+    jclass      mSoundPoolClass;
+} fields;
+
+static inline SoundPool* MusterSoundPool(JNIEnv *env, jobject thiz) {
+    return (SoundPool*)env->GetIntField(thiz, fields.mNativeContext);
+}
+
+// ----------------------------------------------------------------------------
+static int
+android_media_SoundPool_load_URL(JNIEnv *env, jobject thiz, jstring path, jint priority)
+{
+    LOGV("android_media_SoundPool_load_URL");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (path == NULL) {
+        jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
+        return 0;
+    }
+    const char* s = env->GetStringUTFChars(path, NULL);
+    int id = ap->load(s, priority);
+    env->ReleaseStringUTFChars(path, s);
+    return id;
+}
+
+static int
+android_media_SoundPool_load_FD(JNIEnv *env, jobject thiz, jobject fileDescriptor,
+        jlong offset, jlong length, jint priority)
+{
+    LOGV("android_media_SoundPool_load_FD");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return 0;
+    return ap->load(getParcelFileDescriptorFD(env, fileDescriptor),
+            int64_t(offset), int64_t(length), int(priority));
+}
+
+static bool
+android_media_SoundPool_unload(JNIEnv *env, jobject thiz, jint sampleID) {
+    LOGV("android_media_SoundPool_unload\n");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return 0;
+    return ap->unload(sampleID);
+}
+
+static int
+android_media_SoundPool_play(JNIEnv *env, jobject thiz, jint sampleID,
+        jfloat leftVolume, jfloat rightVolume, jint priority, jint loop,
+        jfloat rate)
+{
+    LOGV("android_media_SoundPool_play\n");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return 0;
+    return ap->play(sampleID, leftVolume, rightVolume, priority, loop, rate);
+}
+
+static void
+android_media_SoundPool_pause(JNIEnv *env, jobject thiz, jint channelID)
+{
+    LOGV("android_media_SoundPool_pause");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->pause(channelID);
+}
+
+static void
+android_media_SoundPool_resume(JNIEnv *env, jobject thiz, jint channelID)
+{
+    LOGV("android_media_SoundPool_resume");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->resume(channelID);
+}
+
+static void
+android_media_SoundPool_autoPause(JNIEnv *env, jobject thiz)
+{
+    LOGV("android_media_SoundPool_autoPause");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->autoPause();
+}
+
+static void
+android_media_SoundPool_autoResume(JNIEnv *env, jobject thiz)
+{
+    LOGV("android_media_SoundPool_autoResume");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->autoResume();
+}
+
+static void
+android_media_SoundPool_stop(JNIEnv *env, jobject thiz, jint channelID)
+{
+    LOGV("android_media_SoundPool_stop");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->stop(channelID);
+}
+
+static void
+android_media_SoundPool_setVolume(JNIEnv *env, jobject thiz, jint channelID,
+        float leftVolume, float rightVolume)
+{
+    LOGV("android_media_SoundPool_setVolume");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->setVolume(channelID, leftVolume, rightVolume);
+}
+
+static void
+android_media_SoundPool_setPriority(JNIEnv *env, jobject thiz, jint channelID,
+        int priority)
+{
+    LOGV("android_media_SoundPool_setPriority");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->setPriority(channelID, priority);
+}
+
+static void
+android_media_SoundPool_setLoop(JNIEnv *env, jobject thiz, jint channelID,
+        int loop)
+{
+    LOGV("android_media_SoundPool_setLoop");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->setLoop(channelID, loop);
+}
+
+static void
+android_media_SoundPool_setRate(JNIEnv *env, jobject thiz, jint channelID,
+        float rate)
+{
+    LOGV("android_media_SoundPool_setRate");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap == NULL) return;
+    ap->setRate(channelID, rate);
+}
+
+static void android_media_callback(SoundPoolEvent event, SoundPool* soundPool, void* user)
+{
+    LOGV("callback: (%d, %d, %d, %p, %p)", event.mMsg, event.mArg1, event.mArg2, soundPool, user);
+    JNIEnv *env = AndroidRuntime::getJNIEnv();
+    env->CallStaticVoidMethod(fields.mSoundPoolClass, fields.mPostEvent, user, event.mMsg, event.mArg1, event.mArg2, NULL);
+}
+
+static jint
+android_media_SoundPool_native_setup(JNIEnv *env, jobject thiz, jobject weakRef, jint maxChannels, jint streamType, jint srcQuality)
+{
+    LOGV("android_media_SoundPool_native_setup");
+    SoundPool *ap = new SoundPool(maxChannels, streamType, srcQuality);
+    if (ap == NULL) {
+        return -1;
+    }
+
+    // save pointer to SoundPool C++ object in opaque field in Java object
+    env->SetIntField(thiz, fields.mNativeContext, (int)ap);
+
+    // set callback with weak reference
+    jobject globalWeakRef = env->NewGlobalRef(weakRef);
+    ap->setCallback(android_media_callback, globalWeakRef);
+    return 0;
+}
+
+static void
+android_media_SoundPool_release(JNIEnv *env, jobject thiz)
+{
+    LOGV("android_media_SoundPool_release");
+    SoundPool *ap = MusterSoundPool(env, thiz);
+    if (ap != NULL) {
+
+        // release weak reference
+        jobject weakRef = (jobject) ap->getUserData();
+        if (weakRef != NULL) {
+            env->DeleteGlobalRef(weakRef);
+        }
+
+        // clear callback and native context
+        ap->setCallback(NULL, NULL);
+        env->SetIntField(thiz, fields.mNativeContext, 0);
+        delete ap;
+    }
+}
+
+// ----------------------------------------------------------------------------
+
+// Dalvik VM type signatures
+static JNINativeMethod gMethods[] = {
+    {   "_load",
+        "(Ljava/lang/String;I)I",
+        (void *)android_media_SoundPool_load_URL
+    },
+    {   "_load",
+        "(Ljava/io/FileDescriptor;JJI)I",
+        (void *)android_media_SoundPool_load_FD
+    },
+    {   "unload",
+        "(I)Z",
+        (void *)android_media_SoundPool_unload
+    },
+    {   "play",
+        "(IFFIIF)I",
+        (void *)android_media_SoundPool_play
+    },
+    {   "pause",
+        "(I)V",
+        (void *)android_media_SoundPool_pause
+    },
+    {   "resume",
+        "(I)V",
+        (void *)android_media_SoundPool_resume
+    },
+    {   "autoPause",
+        "()V",
+        (void *)android_media_SoundPool_autoPause
+    },
+    {   "autoResume",
+        "()V",
+        (void *)android_media_SoundPool_autoResume
+    },
+    {   "stop",
+        "(I)V",
+        (void *)android_media_SoundPool_stop
+    },
+    {   "setVolume",
+        "(IFF)V",
+        (void *)android_media_SoundPool_setVolume
+    },
+    {   "setPriority",
+        "(II)V",
+        (void *)android_media_SoundPool_setPriority
+    },
+    {   "setLoop",
+        "(II)V",
+        (void *)android_media_SoundPool_setLoop
+    },
+    {   "setRate",
+        "(IF)V",
+        (void *)android_media_SoundPool_setRate
+    },
+    {   "native_setup",
+        "(Ljava/lang/Object;III)I",
+        (void*)android_media_SoundPool_native_setup
+    },
+    {   "release",
+        "()V",
+        (void*)android_media_SoundPool_release
+    }
+};
+
+static const char* const kClassPathName = "android/media/SoundPool";
+
+jint JNI_OnLoad(JavaVM* vm, void* reserved)
+{
+    JNIEnv* env = NULL;
+    jint result = -1;
+    jclass clazz;
+
+    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
+        LOGE("ERROR: GetEnv failed\n");
+        goto bail;
+    }
+    assert(env != NULL);
+
+    clazz = env->FindClass(kClassPathName);
+    if (clazz == NULL) {
+        LOGE("Can't find %s", kClassPathName);
+        goto bail;
+    }
+
+    fields.mNativeContext = env->GetFieldID(clazz, "mNativeContext", "I");
+    if (fields.mNativeContext == NULL) {
+        LOGE("Can't find SoundPool.mNativeContext");
+        goto bail;
+    }
+
+    fields.mPostEvent = env->GetStaticMethodID(clazz, "postEventFromNative",
+                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
+    if (fields.mPostEvent == NULL) {
+        LOGE("Can't find android/media/SoundPool.postEventFromNative");
+        goto bail;
+    }
+
+    // create a reference to class. Technically, we're leaking this reference
+    // since it's a static object.
+    fields.mSoundPoolClass = (jclass) env->NewGlobalRef(clazz);
+
+    if (AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods)) < 0)
+        goto bail;
+
+    /* success -- return valid version number */
+    result = JNI_VERSION_1_4;
+
+bail:
+    return result;
+}