media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp - platform/frameworks/av - Git at Google

 /*
  * 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 "NuPlayerRenderer"
 #include <utils/Log.h>

 #include "NuPlayerRenderer.h"

 #include <media/stagefright/foundation/ABuffer.h>
 #include <media/stagefright/foundation/ADebug.h>
 #include <media/stagefright/foundation/AMessage.h>

 namespace android {

 // static
 const int64_t NuPlayer::Renderer::kMinPositionUpdateDelayUs = 100000ll;

 NuPlayer::Renderer::Renderer(
         const sp<MediaPlayerBase::AudioSink> &sink,
         const sp<AMessage> &notify,
         uint32_t flags)
     : mAudioSink(sink),
       mNotify(notify),
       mFlags(flags),
       mNumFramesWritten(0),
       mDrainAudioQueuePending(false),
       mDrainVideoQueuePending(false),
       mAudioQueueGeneration(0),
       mVideoQueueGeneration(0),
       mAnchorTimeMediaUs(-1),
       mAnchorTimeRealUs(-1),
       mFlushingAudio(false),
       mFlushingVideo(false),
       mHasAudio(false),
       mHasVideo(false),
       mSyncQueues(false),
       mPaused(false),
       mVideoRenderingStarted(false),
       mVideoRenderingStartGeneration(0),
       mAudioRenderingStartGeneration(0),
       mLastPositionUpdateUs(-1ll),
       mVideoLateByUs(0ll) {
 }

 NuPlayer::Renderer::~Renderer() {
 }

 void NuPlayer::Renderer::queueBuffer(
         bool audio,
         const sp<ABuffer> &buffer,
         const sp<AMessage> &notifyConsumed) {
     sp<AMessage> msg = new AMessage(kWhatQueueBuffer, id());
     msg->setInt32("audio", static_cast<int32_t>(audio));
     msg->setBuffer("buffer", buffer);
     msg->setMessage("notifyConsumed", notifyConsumed);
     msg->post();
 }

 void NuPlayer::Renderer::queueEOS(bool audio, status_t finalResult) {
     CHECK_NE(finalResult, (status_t)OK);

     sp<AMessage> msg = new AMessage(kWhatQueueEOS, id());
     msg->setInt32("audio", static_cast<int32_t>(audio));
     msg->setInt32("finalResult", finalResult);
     msg->post();
 }

 void NuPlayer::Renderer::flush(bool audio) {
     {
         Mutex::Autolock autoLock(mFlushLock);
         if (audio) {
             CHECK(!mFlushingAudio);
             mFlushingAudio = true;
         } else {
             CHECK(!mFlushingVideo);
             mFlushingVideo = true;
         }
     }

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

 void NuPlayer::Renderer::signalTimeDiscontinuity() {
     // CHECK(mAudioQueue.empty());
     // CHECK(mVideoQueue.empty());
     mAnchorTimeMediaUs = -1;
     mAnchorTimeRealUs = -1;
     mSyncQueues = false;
 }

 void NuPlayer::Renderer::pause() {
     (new AMessage(kWhatPause, id()))->post();
 }

 void NuPlayer::Renderer::resume() {
     (new AMessage(kWhatResume, id()))->post();
 }

 void NuPlayer::Renderer::onMessageReceived(const sp<AMessage> &msg) {
     switch (msg->what()) {
         case kWhatDrainAudioQueue:
         {
             int32_t generation;
             CHECK(msg->findInt32("generation", &generation));
             if (generation != mAudioQueueGeneration) {
                 break;
             }

             mDrainAudioQueuePending = false;

             if (onDrainAudioQueue()) {
                 uint32_t numFramesPlayed;
                 CHECK_EQ(mAudioSink->getPosition(&numFramesPlayed),
                          (status_t)OK);

                 uint32_t numFramesPendingPlayout =
                     mNumFramesWritten - numFramesPlayed;

                 // This is how long the audio sink will have data to
                 // play back.
                 int64_t delayUs =
                     mAudioSink->msecsPerFrame()
                         * numFramesPendingPlayout * 1000ll;

                 // Let's give it more data after about half that time
                 // has elapsed.
                 postDrainAudioQueue(delayUs / 2);
             }
             break;
         }

         case kWhatDrainVideoQueue:
         {
             int32_t generation;
             CHECK(msg->findInt32("generation", &generation));
             if (generation != mVideoQueueGeneration) {
                 break;
             }

             mDrainVideoQueuePending = false;

             onDrainVideoQueue();

             postDrainVideoQueue();
             break;
         }

         case kWhatQueueBuffer:
         {
             onQueueBuffer(msg);
             break;
         }

         case kWhatQueueEOS:
         {
             onQueueEOS(msg);
             break;
         }

         case kWhatFlush:
         {
             onFlush(msg);
             break;
         }

         case kWhatAudioSinkChanged:
         {
             onAudioSinkChanged();
             break;
         }

         case kWhatPause:
         {
             onPause();
             break;
         }

         case kWhatResume:
         {
             onResume();
             break;
         }

         default:
             TRESPASS();
             break;
     }
 }

 void NuPlayer::Renderer::postDrainAudioQueue(int64_t delayUs) {
     if (mDrainAudioQueuePending || mSyncQueues || mPaused) {
         return;
     }

     if (mAudioQueue.empty()) {
         return;
     }

     mDrainAudioQueuePending = true;
     sp<AMessage> msg = new AMessage(kWhatDrainAudioQueue, id());
     msg->setInt32("generation", mAudioQueueGeneration);
     msg->post(delayUs);
 }

 void NuPlayer::Renderer::signalAudioSinkChanged() {
     (new AMessage(kWhatAudioSinkChanged, id()))->post();
 }

 void NuPlayer::Renderer::prepareForMediaRenderingStart() {
     mAudioRenderingStartGeneration = mAudioQueueGeneration;
     mVideoRenderingStartGeneration = mVideoQueueGeneration;
 }

 void NuPlayer::Renderer::notifyIfMediaRenderingStarted() {
     if (mVideoRenderingStartGeneration == mVideoQueueGeneration &&
         mAudioRenderingStartGeneration == mAudioQueueGeneration) {
         mVideoRenderingStartGeneration = -1;
         mAudioRenderingStartGeneration = -1;

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

 bool NuPlayer::Renderer::onDrainAudioQueue() {
     uint32_t numFramesPlayed;
     if (mAudioSink->getPosition(&numFramesPlayed) != OK) {
         return false;
     }

     ssize_t numFramesAvailableToWrite =
         mAudioSink->frameCount() - (mNumFramesWritten - numFramesPlayed);

 #if 0
     if (numFramesAvailableToWrite == mAudioSink->frameCount()) {
         ALOGI("audio sink underrun");
     } else {
         ALOGV("audio queue has %d frames left to play",
              mAudioSink->frameCount() - numFramesAvailableToWrite);
     }
 #endif

     size_t numBytesAvailableToWrite =
         numFramesAvailableToWrite * mAudioSink->frameSize();

     while (numBytesAvailableToWrite > 0 && !mAudioQueue.empty()) {
         QueueEntry *entry = &*mAudioQueue.begin();

         if (entry->mBuffer == NULL) {
             // EOS

             notifyEOS(true /* audio */, entry->mFinalResult);

             mAudioQueue.erase(mAudioQueue.begin());
             entry = NULL;
             return false;
         }

         if (entry->mOffset == 0) {
             int64_t mediaTimeUs;
             CHECK(entry->mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

             ALOGV("rendering audio at media time %.2f secs", mediaTimeUs / 1E6);

             mAnchorTimeMediaUs = mediaTimeUs;

             uint32_t numFramesPlayed;
             CHECK_EQ(mAudioSink->getPosition(&numFramesPlayed), (status_t)OK);

             uint32_t numFramesPendingPlayout =
                 mNumFramesWritten - numFramesPlayed;

             int64_t realTimeOffsetUs =
                 (mAudioSink->latency() / 2  /* XXX */
                     + numFramesPendingPlayout
                         * mAudioSink->msecsPerFrame()) * 1000ll;

             // ALOGI("realTimeOffsetUs = %lld us", realTimeOffsetUs);

             mAnchorTimeRealUs =
                 ALooper::GetNowUs() + realTimeOffsetUs;
         }

         size_t copy = entry->mBuffer->size() - entry->mOffset;
         if (copy > numBytesAvailableToWrite) {
             copy = numBytesAvailableToWrite;
         }

         CHECK_EQ(mAudioSink->write(
                     entry->mBuffer->data() + entry->mOffset, copy),
                  (ssize_t)copy);

         entry->mOffset += copy;
         if (entry->mOffset == entry->mBuffer->size()) {
             entry->mNotifyConsumed->post();
             mAudioQueue.erase(mAudioQueue.begin());

             entry = NULL;
         }

         numBytesAvailableToWrite -= copy;
         size_t copiedFrames = copy / mAudioSink->frameSize();
         mNumFramesWritten += copiedFrames;

         notifyIfMediaRenderingStarted();
     }

     notifyPosition();

     return !mAudioQueue.empty();
 }

 void NuPlayer::Renderer::postDrainVideoQueue() {
     if (mDrainVideoQueuePending || mSyncQueues || mPaused) {
         return;
     }

     if (mVideoQueue.empty()) {
         return;
     }

     QueueEntry &entry = *mVideoQueue.begin();

     sp<AMessage> msg = new AMessage(kWhatDrainVideoQueue, id());
     msg->setInt32("generation", mVideoQueueGeneration);

     int64_t delayUs;

     if (entry.mBuffer == NULL) {
         // EOS doesn't carry a timestamp.
         delayUs = 0;
     } else if (mFlags & FLAG_REAL_TIME) {
         int64_t mediaTimeUs;
         CHECK(entry.mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

         delayUs = mediaTimeUs - ALooper::GetNowUs();
     } else {
         int64_t mediaTimeUs;
         CHECK(entry.mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

         if (mAnchorTimeMediaUs < 0) {
             delayUs = 0;

             if (!mHasAudio) {
                 mAnchorTimeMediaUs = mediaTimeUs;
                 mAnchorTimeRealUs = ALooper::GetNowUs();
             }
         } else {
             int64_t realTimeUs =
                 (mediaTimeUs - mAnchorTimeMediaUs) + mAnchorTimeRealUs;

             delayUs = realTimeUs - ALooper::GetNowUs();
         }
     }

     msg->post(delayUs);

     mDrainVideoQueuePending = true;
 }

 void NuPlayer::Renderer::onDrainVideoQueue() {
     if (mVideoQueue.empty()) {
         return;
     }

     QueueEntry *entry = &*mVideoQueue.begin();

     if (entry->mBuffer == NULL) {
         // EOS

         notifyEOS(false /* audio */, entry->mFinalResult);

         mVideoQueue.erase(mVideoQueue.begin());
         entry = NULL;

         mVideoLateByUs = 0ll;

         notifyPosition();
         return;
     }

     int64_t realTimeUs;
     if (mFlags & FLAG_REAL_TIME) {
         CHECK(entry->mBuffer->meta()->findInt64("timeUs", &realTimeUs));
     } else {
         int64_t mediaTimeUs;
         CHECK(entry->mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

         realTimeUs = mediaTimeUs - mAnchorTimeMediaUs + mAnchorTimeRealUs;
     }

     mVideoLateByUs = ALooper::GetNowUs() - realTimeUs;
     bool tooLate = (mVideoLateByUs > 40000);

     if (tooLate) {
         ALOGV("video late by %lld us (%.2f secs)",
              mVideoLateByUs, mVideoLateByUs / 1E6);
     } else {
         ALOGV("rendering video at media time %.2f secs", mediaTimeUs / 1E6);
     }

     entry->mNotifyConsumed->setInt32("render", !tooLate);
     entry->mNotifyConsumed->post();
     mVideoQueue.erase(mVideoQueue.begin());
     entry = NULL;

     if (!mVideoRenderingStarted) {
         mVideoRenderingStarted = true;
         notifyVideoRenderingStart();
     }

     notifyIfMediaRenderingStarted();

     notifyPosition();
 }

 void NuPlayer::Renderer::notifyVideoRenderingStart() {
     sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", kWhatVideoRenderingStart);
     notify->post();
 }

 void NuPlayer::Renderer::notifyEOS(bool audio, status_t finalResult) {
     sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", kWhatEOS);
     notify->setInt32("audio", static_cast<int32_t>(audio));
     notify->setInt32("finalResult", finalResult);
     notify->post();
 }

 void NuPlayer::Renderer::onQueueBuffer(const sp<AMessage> &msg) {
     int32_t audio;
     CHECK(msg->findInt32("audio", &audio));

     if (audio) {
         mHasAudio = true;
     } else {
         mHasVideo = true;
     }

     if (dropBufferWhileFlushing(audio, msg)) {
         return;
     }

     sp<ABuffer> buffer;
     CHECK(msg->findBuffer("buffer", &buffer));

     sp<AMessage> notifyConsumed;
     CHECK(msg->findMessage("notifyConsumed", &notifyConsumed));

     QueueEntry entry;
     entry.mBuffer = buffer;
     entry.mNotifyConsumed = notifyConsumed;
     entry.mOffset = 0;
     entry.mFinalResult = OK;

     if (audio) {
         mAudioQueue.push_back(entry);
         postDrainAudioQueue();
     } else {
         mVideoQueue.push_back(entry);
         postDrainVideoQueue();
     }

     if (!mSyncQueues || mAudioQueue.empty() || mVideoQueue.empty()) {
         return;
     }

     sp<ABuffer> firstAudioBuffer = (*mAudioQueue.begin()).mBuffer;
     sp<ABuffer> firstVideoBuffer = (*mVideoQueue.begin()).mBuffer;

     if (firstAudioBuffer == NULL || firstVideoBuffer == NULL) {
         // EOS signalled on either queue.
         syncQueuesDone();
         return;
     }

     int64_t firstAudioTimeUs;
     int64_t firstVideoTimeUs;
     CHECK(firstAudioBuffer->meta()
             ->findInt64("timeUs", &firstAudioTimeUs));
     CHECK(firstVideoBuffer->meta()
             ->findInt64("timeUs", &firstVideoTimeUs));

     int64_t diff = firstVideoTimeUs - firstAudioTimeUs;

     ALOGV("queueDiff = %.2f secs", diff / 1E6);

     if (diff > 100000ll) {
         // Audio data starts More than 0.1 secs before video.
         // Drop some audio.

         (*mAudioQueue.begin()).mNotifyConsumed->post();
         mAudioQueue.erase(mAudioQueue.begin());
         return;
     }

     syncQueuesDone();
 }

 void NuPlayer::Renderer::syncQueuesDone() {
     if (!mSyncQueues) {
         return;
     }

     mSyncQueues = false;

     if (!mAudioQueue.empty()) {
         postDrainAudioQueue();
     }

     if (!mVideoQueue.empty()) {
         postDrainVideoQueue();
     }
 }

 void NuPlayer::Renderer::onQueueEOS(const sp<AMessage> &msg) {
     int32_t audio;
     CHECK(msg->findInt32("audio", &audio));

     if (dropBufferWhileFlushing(audio, msg)) {
         return;
     }

     int32_t finalResult;
     CHECK(msg->findInt32("finalResult", &finalResult));

     QueueEntry entry;
     entry.mOffset = 0;
     entry.mFinalResult = finalResult;

     if (audio) {
         if (mAudioQueue.empty() && mSyncQueues) {
             syncQueuesDone();
         }
         mAudioQueue.push_back(entry);
         postDrainAudioQueue();
     } else {
         if (mVideoQueue.empty() && mSyncQueues) {
             syncQueuesDone();
         }
         mVideoQueue.push_back(entry);
         postDrainVideoQueue();
     }
 }

 void NuPlayer::Renderer::onFlush(const sp<AMessage> &msg) {
     int32_t audio;
     CHECK(msg->findInt32("audio", &audio));

     // If we're currently syncing the queues, i.e. dropping audio while
     // aligning the first audio/video buffer times and only one of the
     // two queues has data, we may starve that queue by not requesting
     // more buffers from the decoder. If the other source then encounters
     // a discontinuity that leads to flushing, we'll never find the
     // corresponding discontinuity on the other queue.
     // Therefore we'll stop syncing the queues if at least one of them
     // is flushed.
     syncQueuesDone();

     ALOGV("flushing %s", audio ? "audio" : "video");
     if (audio) {
         flushQueue(&mAudioQueue);

         Mutex::Autolock autoLock(mFlushLock);
         mFlushingAudio = false;

         mDrainAudioQueuePending = false;
         ++mAudioQueueGeneration;

         prepareForMediaRenderingStart();
     } else {
         flushQueue(&mVideoQueue);

         Mutex::Autolock autoLock(mFlushLock);
         mFlushingVideo = false;

         mDrainVideoQueuePending = false;
         ++mVideoQueueGeneration;

         prepareForMediaRenderingStart();
     }

     notifyFlushComplete(audio);
 }

 void NuPlayer::Renderer::flushQueue(List<QueueEntry> *queue) {
     while (!queue->empty()) {
         QueueEntry *entry = &*queue->begin();

         if (entry->mBuffer != NULL) {
             entry->mNotifyConsumed->post();
         }

         queue->erase(queue->begin());
         entry = NULL;
     }
 }

 void NuPlayer::Renderer::notifyFlushComplete(bool audio) {
     sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", kWhatFlushComplete);
     notify->setInt32("audio", static_cast<int32_t>(audio));
     notify->post();
 }

 bool NuPlayer::Renderer::dropBufferWhileFlushing(
         bool audio, const sp<AMessage> &msg) {
     bool flushing = false;

     {
         Mutex::Autolock autoLock(mFlushLock);
         if (audio) {
             flushing = mFlushingAudio;
         } else {
             flushing = mFlushingVideo;
         }
     }

     if (!flushing) {
         return false;
     }

     sp<AMessage> notifyConsumed;
     if (msg->findMessage("notifyConsumed", &notifyConsumed)) {
         notifyConsumed->post();
     }

     return true;
 }

 void NuPlayer::Renderer::onAudioSinkChanged() {
     CHECK(!mDrainAudioQueuePending);
     mNumFramesWritten = 0;
     uint32_t written;
     if (mAudioSink->getFramesWritten(&written) == OK) {
         mNumFramesWritten = written;
     }
 }

 void NuPlayer::Renderer::notifyPosition() {
     if (mAnchorTimeRealUs < 0 || mAnchorTimeMediaUs < 0) {
         return;
     }

     int64_t nowUs = ALooper::GetNowUs();

     if (mLastPositionUpdateUs >= 0
             && nowUs < mLastPositionUpdateUs + kMinPositionUpdateDelayUs) {
         return;
     }
     mLastPositionUpdateUs = nowUs;

     int64_t positionUs = (nowUs - mAnchorTimeRealUs) + mAnchorTimeMediaUs;

     sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", kWhatPosition);
     notify->setInt64("positionUs", positionUs);
     notify->setInt64("videoLateByUs", mVideoLateByUs);
     notify->post();
 }

 void NuPlayer::Renderer::onPause() {
     CHECK(!mPaused);

     mDrainAudioQueuePending = false;
     ++mAudioQueueGeneration;

     mDrainVideoQueuePending = false;
     ++mVideoQueueGeneration;

     prepareForMediaRenderingStart();

     if (mHasAudio) {
         mAudioSink->pause();
     }

     ALOGV("now paused audio queue has %d entries, video has %d entries",
           mAudioQueue.size(), mVideoQueue.size());

     mPaused = true;
 }

 void NuPlayer::Renderer::onResume() {
     if (!mPaused) {
         return;
     }

     if (mHasAudio) {
         mAudioSink->start();
     }

     mPaused = false;

     if (!mAudioQueue.empty()) {
         postDrainAudioQueue();
     }

     if (!mVideoQueue.empty()) {
         postDrainVideoQueue();
     }
 }

 }  // 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 "NuPlayerRenderer"
	#include <utils/Log.h>

	#include "NuPlayerRenderer.h"

	#include <media/stagefright/foundation/ABuffer.h>
	#include <media/stagefright/foundation/ADebug.h>
	#include <media/stagefright/foundation/AMessage.h>

	namespace android {

	// static
	const int64_t NuPlayer::Renderer::kMinPositionUpdateDelayUs = 100000ll;

	NuPlayer::Renderer::Renderer(
	const sp<MediaPlayerBase::AudioSink> &sink,
	const sp<AMessage> &notify,
	uint32_t flags)
	: mAudioSink(sink),
	mNotify(notify),
	mFlags(flags),
	mNumFramesWritten(0),
	mDrainAudioQueuePending(false),
	mDrainVideoQueuePending(false),
	mAudioQueueGeneration(0),
	mVideoQueueGeneration(0),
	mAnchorTimeMediaUs(-1),
	mAnchorTimeRealUs(-1),
	mFlushingAudio(false),
	mFlushingVideo(false),
	mHasAudio(false),
	mHasVideo(false),
	mSyncQueues(false),
	mPaused(false),
	mVideoRenderingStarted(false),
	mVideoRenderingStartGeneration(0),
	mAudioRenderingStartGeneration(0),
	mLastPositionUpdateUs(-1ll),
	mVideoLateByUs(0ll) {
	}

	NuPlayer::Renderer::~Renderer() {
	}

	void NuPlayer::Renderer::queueBuffer(
	bool audio,
	const sp<ABuffer> &buffer,
	const sp<AMessage> &notifyConsumed) {
	sp<AMessage> msg = new AMessage(kWhatQueueBuffer, id());
	msg->setInt32("audio", static_cast<int32_t>(audio));
	msg->setBuffer("buffer", buffer);
	msg->setMessage("notifyConsumed", notifyConsumed);
	msg->post();
	}

	void NuPlayer::Renderer::queueEOS(bool audio, status_t finalResult) {
	CHECK_NE(finalResult, (status_t)OK);

	sp<AMessage> msg = new AMessage(kWhatQueueEOS, id());
	msg->setInt32("audio", static_cast<int32_t>(audio));
	msg->setInt32("finalResult", finalResult);
	msg->post();
	}

	void NuPlayer::Renderer::flush(bool audio) {
	{
	Mutex::Autolock autoLock(mFlushLock);
	if (audio) {
	CHECK(!mFlushingAudio);
	mFlushingAudio = true;
	} else {
	CHECK(!mFlushingVideo);
	mFlushingVideo = true;
	}
	}

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

	void NuPlayer::Renderer::signalTimeDiscontinuity() {
	// CHECK(mAudioQueue.empty());
	// CHECK(mVideoQueue.empty());
	mAnchorTimeMediaUs = -1;
	mAnchorTimeRealUs = -1;
	mSyncQueues = false;
	}

	void NuPlayer::Renderer::pause() {
	(new AMessage(kWhatPause, id()))->post();
	}

	void NuPlayer::Renderer::resume() {
	(new AMessage(kWhatResume, id()))->post();
	}

	void NuPlayer::Renderer::onMessageReceived(const sp<AMessage> &msg) {
	switch (msg->what()) {
	case kWhatDrainAudioQueue:
	{
	int32_t generation;
	CHECK(msg->findInt32("generation", &generation));
	if (generation != mAudioQueueGeneration) {
	break;
	}

	mDrainAudioQueuePending = false;

	if (onDrainAudioQueue()) {
	uint32_t numFramesPlayed;
	CHECK_EQ(mAudioSink->getPosition(&numFramesPlayed),
	(status_t)OK);

	uint32_t numFramesPendingPlayout =
	mNumFramesWritten - numFramesPlayed;

	// This is how long the audio sink will have data to
	// play back.
	int64_t delayUs =
	mAudioSink->msecsPerFrame()
	* numFramesPendingPlayout * 1000ll;

	// Let's give it more data after about half that time
	// has elapsed.
	postDrainAudioQueue(delayUs / 2);
	}
	break;
	}

	case kWhatDrainVideoQueue:
	{
	int32_t generation;
	CHECK(msg->findInt32("generation", &generation));
	if (generation != mVideoQueueGeneration) {
	break;
	}

	mDrainVideoQueuePending = false;

	onDrainVideoQueue();

	postDrainVideoQueue();
	break;
	}

	case kWhatQueueBuffer:
	{
	onQueueBuffer(msg);
	break;
	}

	case kWhatQueueEOS:
	{
	onQueueEOS(msg);
	break;
	}

	case kWhatFlush:
	{
	onFlush(msg);
	break;
	}

	case kWhatAudioSinkChanged:
	{
	onAudioSinkChanged();
	break;
	}

	case kWhatPause:
	{
	onPause();
	break;
	}

	case kWhatResume:
	{
	onResume();
	break;
	}

	default:
	TRESPASS();
	break;
	}
	}

	void NuPlayer::Renderer::postDrainAudioQueue(int64_t delayUs) {
	if (mDrainAudioQueuePending \|\| mSyncQueues \|\| mPaused) {
	return;
	}

	if (mAudioQueue.empty()) {
	return;
	}

	mDrainAudioQueuePending = true;
	sp<AMessage> msg = new AMessage(kWhatDrainAudioQueue, id());
	msg->setInt32("generation", mAudioQueueGeneration);
	msg->post(delayUs);
	}

	void NuPlayer::Renderer::signalAudioSinkChanged() {
	(new AMessage(kWhatAudioSinkChanged, id()))->post();
	}

	void NuPlayer::Renderer::prepareForMediaRenderingStart() {
	mAudioRenderingStartGeneration = mAudioQueueGeneration;
	mVideoRenderingStartGeneration = mVideoQueueGeneration;
	}

	void NuPlayer::Renderer::notifyIfMediaRenderingStarted() {
	if (mVideoRenderingStartGeneration == mVideoQueueGeneration &&
	mAudioRenderingStartGeneration == mAudioQueueGeneration) {
	mVideoRenderingStartGeneration = -1;
	mAudioRenderingStartGeneration = -1;

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

	bool NuPlayer::Renderer::onDrainAudioQueue() {
	uint32_t numFramesPlayed;
	if (mAudioSink->getPosition(&numFramesPlayed) != OK) {
	return false;
	}

	ssize_t numFramesAvailableToWrite =
	mAudioSink->frameCount() - (mNumFramesWritten - numFramesPlayed);

	#if 0
	if (numFramesAvailableToWrite == mAudioSink->frameCount()) {
	ALOGI("audio sink underrun");
	} else {
	ALOGV("audio queue has %d frames left to play",
	mAudioSink->frameCount() - numFramesAvailableToWrite);
	}
	#endif

	size_t numBytesAvailableToWrite =
	numFramesAvailableToWrite * mAudioSink->frameSize();

	while (numBytesAvailableToWrite > 0 && !mAudioQueue.empty()) {
	QueueEntry entry = &mAudioQueue.begin();

	if (entry->mBuffer == NULL) {
	// EOS

	notifyEOS(true /* audio */, entry->mFinalResult);

	mAudioQueue.erase(mAudioQueue.begin());
	entry = NULL;
	return false;
	}

	if (entry->mOffset == 0) {
	int64_t mediaTimeUs;
	CHECK(entry->mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

	ALOGV("rendering audio at media time %.2f secs", mediaTimeUs / 1E6);

	mAnchorTimeMediaUs = mediaTimeUs;

	uint32_t numFramesPlayed;
	CHECK_EQ(mAudioSink->getPosition(&numFramesPlayed), (status_t)OK);

	uint32_t numFramesPendingPlayout =
	mNumFramesWritten - numFramesPlayed;

	int64_t realTimeOffsetUs =
	(mAudioSink->latency() / 2 /* XXX */
	+ numFramesPendingPlayout
	* mAudioSink->msecsPerFrame()) * 1000ll;

	// ALOGI("realTimeOffsetUs = %lld us", realTimeOffsetUs);

	mAnchorTimeRealUs =
	ALooper::GetNowUs() + realTimeOffsetUs;
	}

	size_t copy = entry->mBuffer->size() - entry->mOffset;
	if (copy > numBytesAvailableToWrite) {
	copy = numBytesAvailableToWrite;
	}

	CHECK_EQ(mAudioSink->write(
	entry->mBuffer->data() + entry->mOffset, copy),
	(ssize_t)copy);

	entry->mOffset += copy;
	if (entry->mOffset == entry->mBuffer->size()) {
	entry->mNotifyConsumed->post();
	mAudioQueue.erase(mAudioQueue.begin());

	entry = NULL;
	}

	numBytesAvailableToWrite -= copy;
	size_t copiedFrames = copy / mAudioSink->frameSize();
	mNumFramesWritten += copiedFrames;

	notifyIfMediaRenderingStarted();
	}

	notifyPosition();

	return !mAudioQueue.empty();
	}

	void NuPlayer::Renderer::postDrainVideoQueue() {
	if (mDrainVideoQueuePending \|\| mSyncQueues \|\| mPaused) {
	return;
	}

	if (mVideoQueue.empty()) {
	return;
	}

	QueueEntry &entry = *mVideoQueue.begin();

	sp<AMessage> msg = new AMessage(kWhatDrainVideoQueue, id());
	msg->setInt32("generation", mVideoQueueGeneration);

	int64_t delayUs;

	if (entry.mBuffer == NULL) {
	// EOS doesn't carry a timestamp.
	delayUs = 0;
	} else if (mFlags & FLAG_REAL_TIME) {
	int64_t mediaTimeUs;
	CHECK(entry.mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

	delayUs = mediaTimeUs - ALooper::GetNowUs();
	} else {
	int64_t mediaTimeUs;
	CHECK(entry.mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

	if (mAnchorTimeMediaUs < 0) {
	delayUs = 0;

	if (!mHasAudio) {
	mAnchorTimeMediaUs = mediaTimeUs;
	mAnchorTimeRealUs = ALooper::GetNowUs();
	}
	} else {
	int64_t realTimeUs =
	(mediaTimeUs - mAnchorTimeMediaUs) + mAnchorTimeRealUs;

	delayUs = realTimeUs - ALooper::GetNowUs();
	}
	}

	msg->post(delayUs);

	mDrainVideoQueuePending = true;
	}

	void NuPlayer::Renderer::onDrainVideoQueue() {
	if (mVideoQueue.empty()) {
	return;
	}

	QueueEntry entry = &mVideoQueue.begin();

	if (entry->mBuffer == NULL) {
	// EOS

	notifyEOS(false /* audio */, entry->mFinalResult);

	mVideoQueue.erase(mVideoQueue.begin());
	entry = NULL;

	mVideoLateByUs = 0ll;

	notifyPosition();
	return;
	}

	int64_t realTimeUs;
	if (mFlags & FLAG_REAL_TIME) {
	CHECK(entry->mBuffer->meta()->findInt64("timeUs", &realTimeUs));
	} else {
	int64_t mediaTimeUs;
	CHECK(entry->mBuffer->meta()->findInt64("timeUs", &mediaTimeUs));

	realTimeUs = mediaTimeUs - mAnchorTimeMediaUs + mAnchorTimeRealUs;
	}

	mVideoLateByUs = ALooper::GetNowUs() - realTimeUs;
	bool tooLate = (mVideoLateByUs > 40000);

	if (tooLate) {
	ALOGV("video late by %lld us (%.2f secs)",
	mVideoLateByUs, mVideoLateByUs / 1E6);
	} else {
	ALOGV("rendering video at media time %.2f secs", mediaTimeUs / 1E6);
	}

	entry->mNotifyConsumed->setInt32("render", !tooLate);
	entry->mNotifyConsumed->post();
	mVideoQueue.erase(mVideoQueue.begin());
	entry = NULL;

	if (!mVideoRenderingStarted) {
	mVideoRenderingStarted = true;
	notifyVideoRenderingStart();
	}

	notifyIfMediaRenderingStarted();

	notifyPosition();
	}

	void NuPlayer::Renderer::notifyVideoRenderingStart() {
	sp<AMessage> notify = mNotify->dup();
	notify->setInt32("what", kWhatVideoRenderingStart);
	notify->post();
	}

	void NuPlayer::Renderer::notifyEOS(bool audio, status_t finalResult) {
	sp<AMessage> notify = mNotify->dup();
	notify->setInt32("what", kWhatEOS);
	notify->setInt32("audio", static_cast<int32_t>(audio));
	notify->setInt32("finalResult", finalResult);
	notify->post();
	}

	void NuPlayer::Renderer::onQueueBuffer(const sp<AMessage> &msg) {
	int32_t audio;
	CHECK(msg->findInt32("audio", &audio));

	if (audio) {
	mHasAudio = true;
	} else {
	mHasVideo = true;
	}

	if (dropBufferWhileFlushing(audio, msg)) {
	return;
	}

	sp<ABuffer> buffer;
	CHECK(msg->findBuffer("buffer", &buffer));

	sp<AMessage> notifyConsumed;
	CHECK(msg->findMessage("notifyConsumed", &notifyConsumed));

	QueueEntry entry;
	entry.mBuffer = buffer;
	entry.mNotifyConsumed = notifyConsumed;
	entry.mOffset = 0;
	entry.mFinalResult = OK;

	if (audio) {
	mAudioQueue.push_back(entry);
	postDrainAudioQueue();
	} else {
	mVideoQueue.push_back(entry);
	postDrainVideoQueue();
	}

	if (!mSyncQueues \|\| mAudioQueue.empty() \|\| mVideoQueue.empty()) {
	return;
	}

	sp<ABuffer> firstAudioBuffer = (*mAudioQueue.begin()).mBuffer;
	sp<ABuffer> firstVideoBuffer = (*mVideoQueue.begin()).mBuffer;

	if (firstAudioBuffer == NULL \|\| firstVideoBuffer == NULL) {
	// EOS signalled on either queue.
	syncQueuesDone();
	return;
	}

	int64_t firstAudioTimeUs;
	int64_t firstVideoTimeUs;
	CHECK(firstAudioBuffer->meta()
	->findInt64("timeUs", &firstAudioTimeUs));
	CHECK(firstVideoBuffer->meta()
	->findInt64("timeUs", &firstVideoTimeUs));

	int64_t diff = firstVideoTimeUs - firstAudioTimeUs;

	ALOGV("queueDiff = %.2f secs", diff / 1E6);

	if (diff > 100000ll) {
	// Audio data starts More than 0.1 secs before video.
	// Drop some audio.

	(*mAudioQueue.begin()).mNotifyConsumed->post();
	mAudioQueue.erase(mAudioQueue.begin());
	return;
	}

	syncQueuesDone();
	}

	void NuPlayer::Renderer::syncQueuesDone() {
	if (!mSyncQueues) {
	return;
	}

	mSyncQueues = false;

	if (!mAudioQueue.empty()) {
	postDrainAudioQueue();
	}

	if (!mVideoQueue.empty()) {
	postDrainVideoQueue();
	}
	}

	void NuPlayer::Renderer::onQueueEOS(const sp<AMessage> &msg) {
	int32_t audio;
	CHECK(msg->findInt32("audio", &audio));

	if (dropBufferWhileFlushing(audio, msg)) {
	return;
	}

	int32_t finalResult;
	CHECK(msg->findInt32("finalResult", &finalResult));

	QueueEntry entry;
	entry.mOffset = 0;
	entry.mFinalResult = finalResult;

	if (audio) {
	if (mAudioQueue.empty() && mSyncQueues) {
	syncQueuesDone();
	}
	mAudioQueue.push_back(entry);
	postDrainAudioQueue();
	} else {
	if (mVideoQueue.empty() && mSyncQueues) {
	syncQueuesDone();
	}
	mVideoQueue.push_back(entry);
	postDrainVideoQueue();
	}
	}

	void NuPlayer::Renderer::onFlush(const sp<AMessage> &msg) {
	int32_t audio;
	CHECK(msg->findInt32("audio", &audio));

	// If we're currently syncing the queues, i.e. dropping audio while
	// aligning the first audio/video buffer times and only one of the
	// two queues has data, we may starve that queue by not requesting
	// more buffers from the decoder. If the other source then encounters
	// a discontinuity that leads to flushing, we'll never find the
	// corresponding discontinuity on the other queue.
	// Therefore we'll stop syncing the queues if at least one of them
	// is flushed.
	syncQueuesDone();

	ALOGV("flushing %s", audio ? "audio" : "video");
	if (audio) {
	flushQueue(&mAudioQueue);

	Mutex::Autolock autoLock(mFlushLock);
	mFlushingAudio = false;

	mDrainAudioQueuePending = false;
	++mAudioQueueGeneration;

	prepareForMediaRenderingStart();
	} else {
	flushQueue(&mVideoQueue);

	Mutex::Autolock autoLock(mFlushLock);
	mFlushingVideo = false;

	mDrainVideoQueuePending = false;
	++mVideoQueueGeneration;

	prepareForMediaRenderingStart();
	}

	notifyFlushComplete(audio);
	}

	void NuPlayer::Renderer::flushQueue(List<QueueEntry> *queue) {
	while (!queue->empty()) {
	QueueEntry entry = &queue->begin();

	if (entry->mBuffer != NULL) {
	entry->mNotifyConsumed->post();
	}

	queue->erase(queue->begin());
	entry = NULL;
	}
	}

	void NuPlayer::Renderer::notifyFlushComplete(bool audio) {
	sp<AMessage> notify = mNotify->dup();
	notify->setInt32("what", kWhatFlushComplete);
	notify->setInt32("audio", static_cast<int32_t>(audio));
	notify->post();
	}

	bool NuPlayer::Renderer::dropBufferWhileFlushing(
	bool audio, const sp<AMessage> &msg) {
	bool flushing = false;

	{
	Mutex::Autolock autoLock(mFlushLock);
	if (audio) {
	flushing = mFlushingAudio;
	} else {
	flushing = mFlushingVideo;
	}
	}

	if (!flushing) {
	return false;
	}

	sp<AMessage> notifyConsumed;
	if (msg->findMessage("notifyConsumed", &notifyConsumed)) {
	notifyConsumed->post();
	}

	return true;
	}

	void NuPlayer::Renderer::onAudioSinkChanged() {
	CHECK(!mDrainAudioQueuePending);
	mNumFramesWritten = 0;
	uint32_t written;
	if (mAudioSink->getFramesWritten(&written) == OK) {
	mNumFramesWritten = written;
	}
	}

	void NuPlayer::Renderer::notifyPosition() {
	if (mAnchorTimeRealUs < 0 \|\| mAnchorTimeMediaUs < 0) {
	return;
	}

	int64_t nowUs = ALooper::GetNowUs();

	if (mLastPositionUpdateUs >= 0
	&& nowUs < mLastPositionUpdateUs + kMinPositionUpdateDelayUs) {
	return;
	}
	mLastPositionUpdateUs = nowUs;

	int64_t positionUs = (nowUs - mAnchorTimeRealUs) + mAnchorTimeMediaUs;

	sp<AMessage> notify = mNotify->dup();
	notify->setInt32("what", kWhatPosition);
	notify->setInt64("positionUs", positionUs);
	notify->setInt64("videoLateByUs", mVideoLateByUs);
	notify->post();
	}

	void NuPlayer::Renderer::onPause() {
	CHECK(!mPaused);

	mDrainAudioQueuePending = false;
	++mAudioQueueGeneration;

	mDrainVideoQueuePending = false;
	++mVideoQueueGeneration;

	prepareForMediaRenderingStart();

	if (mHasAudio) {
	mAudioSink->pause();
	}

	ALOGV("now paused audio queue has %d entries, video has %d entries",
	mAudioQueue.size(), mVideoQueue.size());

	mPaused = true;
	}

	void NuPlayer::Renderer::onResume() {
	if (!mPaused) {
	return;
	}

	if (mHasAudio) {
	mAudioSink->start();
	}

	mPaused = false;

	if (!mAudioQueue.empty()) {
	postDrainAudioQueue();
	}

	if (!mVideoQueue.empty()) {
	postDrainVideoQueue();
	}
	}

	} // namespace android