media/libmediaplayerservice/nuplayer/DecoderWrapper.cpp - android_frameworks_av - Gitiles

 /*
  * Copyright (C) 2010 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 "DecoderWrapper"
 #include <utils/Log.h>

 #include "DecoderWrapper.h"

 #include "AACDecoder.h"

 #include <media/stagefright/foundation/hexdump.h>
 #include <media/stagefright/foundation/ABuffer.h>
 #include <media/stagefright/foundation/ADebug.h>
 #include <media/stagefright/foundation/AMessage.h>
 #include <media/stagefright/ACodec.h>
 #include <media/stagefright/MediaBuffer.h>
 #include <media/stagefright/MediaDefs.h>
 #include <media/stagefright/MediaSource.h>
 #include <media/stagefright/MetaData.h>

 namespace android {

 struct DecoderWrapper::WrapperSource : public MediaSource {
     WrapperSource(
             const sp<MetaData> &meta,
             const sp<AMessage> &notify);

     virtual status_t start(MetaData *params);
     virtual status_t stop();
     virtual sp<MetaData> getFormat();

     virtual status_t read(
             MediaBuffer **buffer, const ReadOptions *options);

     void queueBuffer(const sp<ABuffer> &buffer);
     void queueEOS(status_t finalResult);
     void clear();

 protected:
     virtual ~WrapperSource();

 private:
     Mutex mLock;
     Condition mCondition;

     sp<MetaData> mMeta;
     sp<AMessage> mNotify;

     List<sp<ABuffer> > mQueue;
     status_t mFinalResult;

     DISALLOW_EVIL_CONSTRUCTORS(WrapperSource);
 };

 DecoderWrapper::WrapperSource::WrapperSource(
         const sp<MetaData> &meta, const sp<AMessage> &notify)
     : mMeta(meta),
       mNotify(notify),
       mFinalResult(OK) {
 }

 DecoderWrapper::WrapperSource::~WrapperSource() {
 }

 status_t DecoderWrapper::WrapperSource::start(MetaData *params) {
     return OK;
 }

 status_t DecoderWrapper::WrapperSource::stop() {
     return OK;
 }

 sp<MetaData> DecoderWrapper::WrapperSource::getFormat() {
     return mMeta;
 }

 status_t DecoderWrapper::WrapperSource::read(
         MediaBuffer **out, const ReadOptions *options) {
     Mutex::Autolock autoLock(mLock);

     bool requestedBuffer = false;

     while (mQueue.empty() && mFinalResult == OK) {
         if (!requestedBuffer) {
             mNotify->dup()->post();
             requestedBuffer = true;
         }

         mCondition.wait(mLock);
     }

     if (mQueue.empty()) {
         return mFinalResult;
     }

     sp<ABuffer> src = *mQueue.begin();
     mQueue.erase(mQueue.begin());

     MediaBuffer *dst = new MediaBuffer(src->size());
     memcpy(dst->data(), src->data(), src->size());

     int64_t timeUs;
     CHECK(src->meta()->findInt64("timeUs", &timeUs));

     dst->meta_data()->setInt64(kKeyTime, timeUs);

     *out = dst;

     return OK;
 }

 void DecoderWrapper::WrapperSource::queueBuffer(const sp<ABuffer> &buffer) {
     Mutex::Autolock autoLock(mLock);
     mQueue.push_back(buffer);
     mCondition.broadcast();
 }

 void DecoderWrapper::WrapperSource::queueEOS(status_t finalResult) {
     CHECK_NE(finalResult, (status_t)OK);

     Mutex::Autolock autoLock(mLock);
     mFinalResult = finalResult;
     mCondition.broadcast();
 }

 void DecoderWrapper::WrapperSource::clear() {
     Mutex::Autolock autoLock(mLock);
     mQueue.clear();
     mFinalResult = OK;
 }

 ////////////////////////////////////////////////////////////////////////////////

 struct DecoderWrapper::WrapperReader : public AHandler {
     WrapperReader(
             const sp<MediaSource> &decoder,
             const sp<AMessage> &notify);

     void start();
     void stop();
     void readMore(bool flush = false);

 protected:
     virtual ~WrapperReader();

     virtual void onMessageReceived(const sp<AMessage> &msg);

 private:
     enum {
         kWhatRead
     };

     sp<MediaSource> mDecoder;
     sp<AMessage> mNotify;
     bool mEOS;
     bool mSentFormat;

     void sendFormatChange();

     DISALLOW_EVIL_CONSTRUCTORS(WrapperReader);
 };

 DecoderWrapper::WrapperReader::WrapperReader(
         const sp<MediaSource> &decoder, const sp<AMessage> &notify)
     : mDecoder(decoder),
       mNotify(notify),
       mEOS(false),
       mSentFormat(false) {
 }

 DecoderWrapper::WrapperReader::~WrapperReader() {
 }

 void DecoderWrapper::WrapperReader::start() {
     CHECK_EQ(mDecoder->start(), (status_t)OK);
     readMore();
 }

 void DecoderWrapper::WrapperReader::stop() {
     CHECK_EQ(mDecoder->stop(), (status_t)OK);
 }

 void DecoderWrapper::WrapperReader::readMore(bool flush) {
     if (!flush && mEOS) {
         return;
     }

     sp<AMessage> msg = new AMessage(kWhatRead, id());
     msg->setInt32("flush", static_cast<int32_t>(flush));
     msg->post();
 }

 void DecoderWrapper::WrapperReader::onMessageReceived(
         const sp<AMessage> &msg) {
     switch (msg->what()) {
         case kWhatRead:
         {
             int32_t flush;
             CHECK(msg->findInt32("flush", &flush));

             MediaSource::ReadOptions options;
             if (flush) {
                 // Dummy seek
                 options.setSeekTo(0);
                 mEOS = false;
             }

             CHECK(!mEOS);

             MediaBuffer *src;
             status_t err = mDecoder->read(&src, &options);

             if (err == OK) {
                 if (!mSentFormat) {
                     sendFormatChange();
                     mSentFormat = true;
                 }

                 sp<AMessage> notify = mNotify->dup();

                 sp<AMessage> realNotify;
                 CHECK(notify->findMessage("real-notify", &realNotify));

                 realNotify->setInt32("what", ACodec::kWhatDrainThisBuffer);

                 sp<ABuffer> dst = new ABuffer(src->range_length());
                 memcpy(dst->data(),
                        (const uint8_t *)src->data() + src->range_offset(),
                        src->range_length());

                 int64_t timeUs;
                 CHECK(src->meta_data()->findInt64(kKeyTime, &timeUs));
                 src->release();
                 src = NULL;

                 dst->meta()->setInt64("timeUs", timeUs);

                 realNotify->setObject("buffer", dst);

                 notify->post();
             } else if (err == INFO_FORMAT_CHANGED) {
                 sendFormatChange();

                 readMore(false /* flush */);
             } else {
                 sp<AMessage> notify = mNotify->dup();

                 sp<AMessage> realNotify;
                 CHECK(notify->findMessage("real-notify", &realNotify));

                 realNotify->setInt32("what", ACodec::kWhatEOS);
                 mEOS = true;

                 notify->post();
             }
             break;
         }

         default:
             TRESPASS();
             break;
     }
 }

 void DecoderWrapper::WrapperReader::sendFormatChange() {
     sp<AMessage> notify = mNotify->dup();

     sp<AMessage> realNotify;
     CHECK(notify->findMessage("real-notify", &realNotify));

     realNotify->setInt32("what", ACodec::kWhatOutputFormatChanged);

     sp<MetaData> meta = mDecoder->getFormat();

     const char *mime;
     CHECK(meta->findCString(kKeyMIMEType, &mime));

     realNotify->setString("mime", mime);

     if (!strncasecmp("audio/", mime, 6)) {
         int32_t numChannels;
         CHECK(meta->findInt32(kKeyChannelCount, &numChannels));

         int32_t sampleRate;
         CHECK(meta->findInt32(kKeySampleRate, &sampleRate));

         realNotify->setInt32("channel-count", numChannels);
         realNotify->setInt32("sample-rate", sampleRate);
     } else {
         CHECK(!strncasecmp("video/", mime, 6));

         int32_t width, height;
         CHECK(meta->findInt32(kKeyWidth, &width));
         CHECK(meta->findInt32(kKeyHeight, &height));

         realNotify->setInt32("width", width);
         realNotify->setInt32("height", height);
     }

     notify->post();

     mSentFormat = true;
 }

 ////////////////////////////////////////////////////////////////////////////////

 DecoderWrapper::DecoderWrapper()
     : mNumOutstandingInputBuffers(0),
       mNumOutstandingOutputBuffers(0),
       mNumPendingDecodes(0),
       mFlushing(false) {
 }

 DecoderWrapper::~DecoderWrapper() {
 }

 void DecoderWrapper::setNotificationMessage(const sp<AMessage> &msg) {
     mNotify = msg;
 }

 void DecoderWrapper::initiateSetup(const sp<AMessage> &msg) {
     msg->setWhat(kWhatSetup);
     msg->setTarget(id());
     msg->post();
 }

 void DecoderWrapper::initiateShutdown() {
     (new AMessage(kWhatShutdown, id()))->post();
 }

 void DecoderWrapper::signalFlush() {
     (new AMessage(kWhatFlush, id()))->post();
 }

 void DecoderWrapper::signalResume() {
     (new AMessage(kWhatResume, id()))->post();
 }

 void DecoderWrapper::onMessageReceived(const sp<AMessage> &msg) {
     switch (msg->what()) {
         case kWhatSetup:
             onSetup(msg);
             break;

         case kWhatShutdown:
             onShutdown();
             break;

         case kWhatInputDataRequested:
         {
             postFillBuffer();
             ++mNumOutstandingInputBuffers;
             break;
         }

         case kWhatInputBufferFilled:
         {
             CHECK_GT(mNumOutstandingInputBuffers, 0);
             --mNumOutstandingInputBuffers;

             if (mFlushing) {
                 mSource->queueEOS(INFO_DISCONTINUITY);

                 completeFlushIfPossible();
                 break;
             }

             sp<RefBase> obj;
             if (!msg->findObject("buffer", &obj)) {
                 int32_t err = OK;
                 CHECK(msg->findInt32("err", &err));

                 mSource->queueEOS(err);
                 break;
             }

             sp<ABuffer> buffer = static_cast<ABuffer *>(obj.get());

             mSource->queueBuffer(buffer);
             break;
         }

         case kWhatFillBufferDone:
         {
             sp<AMessage> notify;
             CHECK(msg->findMessage("real-notify", &notify));

             int32_t what;
             CHECK(notify->findInt32("what", &what));

             if (what == ACodec::kWhatDrainThisBuffer) {
                 CHECK_GT(mNumPendingDecodes, 0);
                 --mNumPendingDecodes;

                 sp<AMessage> reply =
                     new AMessage(kWhatOutputBufferDrained, id());

                 notify->setMessage("reply", reply);

                 ++mNumOutstandingOutputBuffers;
             } else if (what == ACodec::kWhatEOS) {
                 CHECK_GT(mNumPendingDecodes, 0);
                 --mNumPendingDecodes;

                 if (mFlushing) {
                     completeFlushIfPossible();
                     break;
                 }
             }

             notify->post();
             break;
         }

         case kWhatOutputBufferDrained:
         {
             CHECK_GT(mNumOutstandingOutputBuffers, 0);
             --mNumOutstandingOutputBuffers;

             if (mFlushing) {
                 completeFlushIfPossible();
                 break;
             }

             ++mNumPendingDecodes;
             mReader->readMore();
             break;
         }

         case kWhatFlush:
         {
             onFlush();
             break;
         }

         case kWhatResume:
         {
             onResume();
             break;
         }

         default:
             TRESPASS();
             break;
     }
 }

 void DecoderWrapper::onSetup(const sp<AMessage> &msg) {
     AString mime;
     CHECK(msg->findString("mime", &mime));

     CHECK(!strcasecmp(mime.c_str(), MEDIA_MIMETYPE_AUDIO_AAC));

     int32_t numChannels, sampleRate;
     CHECK(msg->findInt32("channel-count", &numChannels));
     CHECK(msg->findInt32("sample-rate", &sampleRate));

     sp<RefBase> obj;
     CHECK(msg->findObject("esds", &obj));
     sp<ABuffer> esds = static_cast<ABuffer *>(obj.get());

     sp<MetaData> meta = new MetaData;
     meta->setCString(kKeyMIMEType, mime.c_str());
     meta->setInt32(kKeySampleRate, sampleRate);
     meta->setInt32(kKeyChannelCount, numChannels);
     meta->setData(kKeyESDS, 0, esds->data(), esds->size());

     mSource = new WrapperSource(
             meta, new AMessage(kWhatInputDataRequested, id()));

     sp<MediaSource> decoder = new AACDecoder(mSource);

     mReaderLooper = new ALooper;
     mReaderLooper->setName("DecoderWrapper looper");

     mReaderLooper->start(
             false, /* runOnCallingThread */
             false, /* canCallJava */
             PRIORITY_AUDIO);

     sp<AMessage> notify = new AMessage(kWhatFillBufferDone, id());
     notify->setMessage("real-notify", mNotify);

     mReader = new WrapperReader(decoder, notify);
     mReaderLooper->registerHandler(mReader);

     mReader->start();
     ++mNumPendingDecodes;
 }

 void DecoderWrapper::onShutdown() {
     mReaderLooper->stop();
     mReaderLooper.clear();

     mReader->stop();
     mReader.clear();

     mSource.clear();

     mNumOutstandingInputBuffers = 0;
     mNumOutstandingOutputBuffers = 0;
     mNumPendingDecodes = 0;
     mFlushing = false;

     sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", ACodec::kWhatShutdownCompleted);
     notify->post();
 }

 void DecoderWrapper::postFillBuffer() {
     sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", ACodec::kWhatFillThisBuffer);
     sp<AMessage> reply = new AMessage(kWhatInputBufferFilled, id());
     notify->setMessage("reply", reply);
     notify->post();
 }

 void DecoderWrapper::onFlush() {
     CHECK(!mFlushing);
     mFlushing = true;

     completeFlushIfPossible();
 }

 void DecoderWrapper::completeFlushIfPossible() {
     CHECK(mFlushing);

     if (mNumOutstandingInputBuffers > 0
             || mNumOutstandingOutputBuffers > 0
             || mNumPendingDecodes > 0) {
         return;
     }

     mFlushing = false;

     sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", ACodec::kWhatFlushCompleted);
     notify->post();
 }

 void DecoderWrapper::onResume() {
     CHECK(!mFlushing);

     ++mNumPendingDecodes;

     mSource->clear();
     mReader->readMore(true /* flush */);
 }

 }  // namespace android
	/*
	* Copyright (C) 2010 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 "DecoderWrapper"
	#include <utils/Log.h>

	#include "DecoderWrapper.h"

	#include "AACDecoder.h"

	#include <media/stagefright/foundation/hexdump.h>
	#include <media/stagefright/foundation/ABuffer.h>
	#include <media/stagefright/foundation/ADebug.h>
	#include <media/stagefright/foundation/AMessage.h>
	#include <media/stagefright/ACodec.h>
	#include <media/stagefright/MediaBuffer.h>
	#include <media/stagefright/MediaDefs.h>
	#include <media/stagefright/MediaSource.h>
	#include <media/stagefright/MetaData.h>

	namespace android {

	struct DecoderWrapper::WrapperSource : public MediaSource {
	WrapperSource(
	const sp<MetaData> &meta,
	const sp<AMessage> &notify);

	virtual status_t start(MetaData *params);
	virtual status_t stop();
	virtual sp<MetaData> getFormat();

	virtual status_t read(
	MediaBuffer *buffer, const ReadOptions options);

	void queueBuffer(const sp<ABuffer> &buffer);
	void queueEOS(status_t finalResult);
	void clear();

	protected:
	virtual ~WrapperSource();

	private:
	Mutex mLock;
	Condition mCondition;

	sp<MetaData> mMeta;
	sp<AMessage> mNotify;

	List<sp<ABuffer> > mQueue;
	status_t mFinalResult;

	DISALLOW_EVIL_CONSTRUCTORS(WrapperSource);
	};

	DecoderWrapper::WrapperSource::WrapperSource(
	const sp<MetaData> &meta, const sp<AMessage> &notify)
	: mMeta(meta),
	mNotify(notify),
	mFinalResult(OK) {
	}

	DecoderWrapper::WrapperSource::~WrapperSource() {
	}

	status_t DecoderWrapper::WrapperSource::start(MetaData *params) {
	return OK;
	}

	status_t DecoderWrapper::WrapperSource::stop() {
	return OK;
	}

	sp<MetaData> DecoderWrapper::WrapperSource::getFormat() {
	return mMeta;
	}

	status_t DecoderWrapper::WrapperSource::read(
	MediaBuffer *out, const ReadOptions options) {
	Mutex::Autolock autoLock(mLock);

	bool requestedBuffer = false;

	while (mQueue.empty() && mFinalResult == OK) {
	if (!requestedBuffer) {
	mNotify->dup()->post();
	requestedBuffer = true;
	}

	mCondition.wait(mLock);
	}

	if (mQueue.empty()) {
	return mFinalResult;
	}

	sp<ABuffer> src = *mQueue.begin();
	mQueue.erase(mQueue.begin());

	MediaBuffer *dst = new MediaBuffer(src->size());
	memcpy(dst->data(), src->data(), src->size());

	int64_t timeUs;
	CHECK(src->meta()->findInt64("timeUs", &timeUs));

	dst->meta_data()->setInt64(kKeyTime, timeUs);

	*out = dst;

	return OK;
	}

	void DecoderWrapper::WrapperSource::queueBuffer(const sp<ABuffer> &buffer) {
	Mutex::Autolock autoLock(mLock);
	mQueue.push_back(buffer);
	mCondition.broadcast();
	}

	void DecoderWrapper::WrapperSource::queueEOS(status_t finalResult) {
	CHECK_NE(finalResult, (status_t)OK);

	Mutex::Autolock autoLock(mLock);
	mFinalResult = finalResult;
	mCondition.broadcast();
	}

	void DecoderWrapper::WrapperSource::clear() {
	Mutex::Autolock autoLock(mLock);
	mQueue.clear();
	mFinalResult = OK;
	}

	////////////////////////////////////////////////////////////////////////////////

	struct DecoderWrapper::WrapperReader : public AHandler {
	WrapperReader(
	const sp<MediaSource> &decoder,
	const sp<AMessage> &notify);

	void start();
	void stop();
	void readMore(bool flush = false);

	protected:
	virtual ~WrapperReader();

	virtual void onMessageReceived(const sp<AMessage> &msg);

	private:
	enum {
	kWhatRead
	};

	sp<MediaSource> mDecoder;
	sp<AMessage> mNotify;
	bool mEOS;
	bool mSentFormat;

	void sendFormatChange();

	DISALLOW_EVIL_CONSTRUCTORS(WrapperReader);
	};

	DecoderWrapper::WrapperReader::WrapperReader(
	const sp<MediaSource> &decoder, const sp<AMessage> &notify)
	: mDecoder(decoder),
	mNotify(notify),
	mEOS(false),
	mSentFormat(false) {
	}

	DecoderWrapper::WrapperReader::~WrapperReader() {
	}

	void DecoderWrapper::WrapperReader::start() {
	CHECK_EQ(mDecoder->start(), (status_t)OK);
	readMore();
	}

	void DecoderWrapper::WrapperReader::stop() {
	CHECK_EQ(mDecoder->stop(), (status_t)OK);
	}

	void DecoderWrapper::WrapperReader::readMore(bool flush) {
	if (!flush && mEOS) {
	return;
	}

	sp<AMessage> msg = new AMessage(kWhatRead, id());
	msg->setInt32("flush", static_cast<int32_t>(flush));
	msg->post();
	}

	void DecoderWrapper::WrapperReader::onMessageReceived(
	const sp<AMessage> &msg) {
	switch (msg->what()) {
	case kWhatRead:
	{
	int32_t flush;
	CHECK(msg->findInt32("flush", &flush));

	MediaSource::ReadOptions options;
	if (flush) {
	// Dummy seek
	options.setSeekTo(0);
	mEOS = false;
	}

	CHECK(!mEOS);

	MediaBuffer *src;
	status_t err = mDecoder->read(&src, &options);

	if (err == OK) {
	if (!mSentFormat) {
	sendFormatChange();
	mSentFormat = true;
	}

	sp<AMessage> notify = mNotify->dup();

	sp<AMessage> realNotify;
	CHECK(notify->findMessage("real-notify", &realNotify));

	realNotify->setInt32("what", ACodec::kWhatDrainThisBuffer);

	sp<ABuffer> dst = new ABuffer(src->range_length());
	memcpy(dst->data(),
	(const uint8_t *)src->data() + src->range_offset(),
	src->range_length());

	int64_t timeUs;
	CHECK(src->meta_data()->findInt64(kKeyTime, &timeUs));
	src->release();
	src = NULL;

	dst->meta()->setInt64("timeUs", timeUs);

	realNotify->setObject("buffer", dst);

	notify->post();
	} else if (err == INFO_FORMAT_CHANGED) {
	sendFormatChange();

	readMore(false /* flush */);
	} else {
	sp<AMessage> notify = mNotify->dup();

	sp<AMessage> realNotify;
	CHECK(notify->findMessage("real-notify", &realNotify));

	realNotify->setInt32("what", ACodec::kWhatEOS);
	mEOS = true;

	notify->post();
	}
	break;
	}

	default:
	TRESPASS();
	break;
	}
	}

	void DecoderWrapper::WrapperReader::sendFormatChange() {
	sp<AMessage> notify = mNotify->dup();

	sp<AMessage> realNotify;
	CHECK(notify->findMessage("real-notify", &realNotify));

	realNotify->setInt32("what", ACodec::kWhatOutputFormatChanged);

	sp<MetaData> meta = mDecoder->getFormat();

	const char *mime;
	CHECK(meta->findCString(kKeyMIMEType, &mime));

	realNotify->setString("mime", mime);

	if (!strncasecmp("audio/", mime, 6)) {
	int32_t numChannels;
	CHECK(meta->findInt32(kKeyChannelCount, &numChannels));

	int32_t sampleRate;
	CHECK(meta->findInt32(kKeySampleRate, &sampleRate));

	realNotify->setInt32("channel-count", numChannels);
	realNotify->setInt32("sample-rate", sampleRate);
	} else {
	CHECK(!strncasecmp("video/", mime, 6));

	int32_t width, height;
	CHECK(meta->findInt32(kKeyWidth, &width));
	CHECK(meta->findInt32(kKeyHeight, &height));

	realNotify->setInt32("width", width);
	realNotify->setInt32("height", height);
	}

	notify->post();

	mSentFormat = true;
	}

	////////////////////////////////////////////////////////////////////////////////

	DecoderWrapper::DecoderWrapper()
	: mNumOutstandingInputBuffers(0),
	mNumOutstandingOutputBuffers(0),
	mNumPendingDecodes(0),
	mFlushing(false) {
	}

	DecoderWrapper::~DecoderWrapper() {
	}

	void DecoderWrapper::setNotificationMessage(const sp<AMessage> &msg) {
	mNotify = msg;
	}

	void DecoderWrapper::initiateSetup(const sp<AMessage> &msg) {
	msg->setWhat(kWhatSetup);
	msg->setTarget(id());
	msg->post();
	}

	void DecoderWrapper::initiateShutdown() {
	(new AMessage(kWhatShutdown, id()))->post();
	}

	void DecoderWrapper::signalFlush() {
	(new AMessage(kWhatFlush, id()))->post();
	}

	void DecoderWrapper::signalResume() {
	(new AMessage(kWhatResume, id()))->post();
	}

	void DecoderWrapper::onMessageReceived(const sp<AMessage> &msg) {
	switch (msg->what()) {
	case kWhatSetup:
	onSetup(msg);
	break;

	case kWhatShutdown:
	onShutdown();
	break;

	case kWhatInputDataRequested:
	{
	postFillBuffer();
	++mNumOutstandingInputBuffers;
	break;
	}

	case kWhatInputBufferFilled:
	{
	CHECK_GT(mNumOutstandingInputBuffers, 0);
	--mNumOutstandingInputBuffers;

	if (mFlushing) {
	mSource->queueEOS(INFO_DISCONTINUITY);

	completeFlushIfPossible();
	break;
	}

	sp<RefBase> obj;
	if (!msg->findObject("buffer", &obj)) {
	int32_t err = OK;
	CHECK(msg->findInt32("err", &err));

	mSource->queueEOS(err);
	break;
	}

	sp<ABuffer> buffer = static_cast<ABuffer *>(obj.get());

	mSource->queueBuffer(buffer);
	break;
	}

	case kWhatFillBufferDone:
	{
	sp<AMessage> notify;
	CHECK(msg->findMessage("real-notify", &notify));

	int32_t what;
	CHECK(notify->findInt32("what", &what));

	if (what == ACodec::kWhatDrainThisBuffer) {
	CHECK_GT(mNumPendingDecodes, 0);
	--mNumPendingDecodes;

	sp<AMessage> reply =
	new AMessage(kWhatOutputBufferDrained, id());

	notify->setMessage("reply", reply);

	++mNumOutstandingOutputBuffers;
	} else if (what == ACodec::kWhatEOS) {
	CHECK_GT(mNumPendingDecodes, 0);
	--mNumPendingDecodes;

	if (mFlushing) {
	completeFlushIfPossible();
	break;
	}
	}

	notify->post();
	break;
	}

	case kWhatOutputBufferDrained:
	{
	CHECK_GT(mNumOutstandingOutputBuffers, 0);
	--mNumOutstandingOutputBuffers;

	if (mFlushing) {
	completeFlushIfPossible();
	break;
	}

	++mNumPendingDecodes;
	mReader->readMore();
	break;
	}

	case kWhatFlush:
	{
	onFlush();
	break;
	}

	case kWhatResume:
	{
	onResume();
	break;
	}

	default:
	TRESPASS();
	break;
	}
	}

	void DecoderWrapper::onSetup(const sp<AMessage> &msg) {
	AString mime;
	CHECK(msg->findString("mime", &mime));

	CHECK(!strcasecmp(mime.c_str(), MEDIA_MIMETYPE_AUDIO_AAC));

	int32_t numChannels, sampleRate;
	CHECK(msg->findInt32("channel-count", &numChannels));
	CHECK(msg->findInt32("sample-rate", &sampleRate));

	sp<RefBase> obj;
	CHECK(msg->findObject("esds", &obj));
	sp<ABuffer> esds = static_cast<ABuffer *>(obj.get());

	sp<MetaData> meta = new MetaData;
	meta->setCString(kKeyMIMEType, mime.c_str());
	meta->setInt32(kKeySampleRate, sampleRate);
	meta->setInt32(kKeyChannelCount, numChannels);
	meta->setData(kKeyESDS, 0, esds->data(), esds->size());

	mSource = new WrapperSource(
	meta, new AMessage(kWhatInputDataRequested, id()));

	sp<MediaSource> decoder = new AACDecoder(mSource);

	mReaderLooper = new ALooper;
	mReaderLooper->setName("DecoderWrapper looper");

	mReaderLooper->start(
	false, /* runOnCallingThread */
	false, /* canCallJava */
	PRIORITY_AUDIO);

	sp<AMessage> notify = new AMessage(kWhatFillBufferDone, id());
	notify->setMessage("real-notify", mNotify);

	mReader = new WrapperReader(decoder, notify);
	mReaderLooper->registerHandler(mReader);

	mReader->start();
	++mNumPendingDecodes;
	}

	void DecoderWrapper::onShutdown() {
	mReaderLooper->stop();
	mReaderLooper.clear();

	mReader->stop();
	mReader.clear();

	mSource.clear();

	mNumOutstandingInputBuffers = 0;
	mNumOutstandingOutputBuffers = 0;
	mNumPendingDecodes = 0;
	mFlushing = false;

	sp<AMessage> notify = mNotify->dup();
	notify->setInt32("what", ACodec::kWhatShutdownCompleted);
	notify->post();
	}

	void DecoderWrapper::postFillBuffer() {
	sp<AMessage> notify = mNotify->dup();
	notify->setInt32("what", ACodec::kWhatFillThisBuffer);
	sp<AMessage> reply = new AMessage(kWhatInputBufferFilled, id());
	notify->setMessage("reply", reply);
	notify->post();
	}

	void DecoderWrapper::onFlush() {
	CHECK(!mFlushing);
	mFlushing = true;

	completeFlushIfPossible();
	}

	void DecoderWrapper::completeFlushIfPossible() {
	CHECK(mFlushing);

	if (mNumOutstandingInputBuffers > 0
	\|\| mNumOutstandingOutputBuffers > 0
	\|\| mNumPendingDecodes > 0) {
	return;
	}

	mFlushing = false;

	sp<AMessage> notify = mNotify->dup();
	notify->setInt32("what", ACodec::kWhatFlushCompleted);
	notify->post();
	}

	void DecoderWrapper::onResume() {
	CHECK(!mFlushing);

	++mNumPendingDecodes;

	mSource->clear();
	mReader->readMore(true /* flush */);
	}

	} // namespace android