media/libmediaplayerservice/nuplayer/NuPlayer.cpp

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

#include "NuPlayer.h"

#include "HTTPLiveSource.h"
#include "NuPlayerDecoder.h"
#include "NuPlayerDecoderPassThrough.h"
#include "NuPlayerDriver.h"
#include "NuPlayerRenderer.h"
#include "NuPlayerSource.h"
#include "RTSPSource.h"
#include "StreamingSource.h"
#include "GenericSource.h"
#include "TextDescriptions.h"

#include "ATSParser.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/MediaBuffer.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MetaData.h>
#include <gui/IGraphicBufferProducer.h>

#include "avc_utils.h"

#include "ESDS.h"
#include <media/stagefright/Utils.h>

namespace android {

struct NuPlayer::Action : public RefBase {
    Action() {}

    virtual void execute(NuPlayer *player) = 0;

private:
    DISALLOW_EVIL_CONSTRUCTORS(Action);
};

struct NuPlayer::SeekAction : public Action {
    SeekAction(int64_t seekTimeUs)
        : mSeekTimeUs(seekTimeUs) {
    }

    virtual void execute(NuPlayer *player) {
        player->performSeek(mSeekTimeUs);
    }

private:
    int64_t mSeekTimeUs;

    DISALLOW_EVIL_CONSTRUCTORS(SeekAction);
};

struct NuPlayer::SetSurfaceAction : public Action {
    SetSurfaceAction(const sp<NativeWindowWrapper> &wrapper)
        : mWrapper(wrapper) {
    }

    virtual void execute(NuPlayer *player) {
        player->performSetSurface(mWrapper);
    }

private:
    sp<NativeWindowWrapper> mWrapper;

    DISALLOW_EVIL_CONSTRUCTORS(SetSurfaceAction);
};

struct NuPlayer::ShutdownDecoderAction : public Action {
    ShutdownDecoderAction(bool audio, bool video)
        : mAudio(audio),
          mVideo(video) {
    }

    virtual void execute(NuPlayer *player) {
        player->performDecoderShutdown(mAudio, mVideo);
    }

private:
    bool mAudio;
    bool mVideo;

    DISALLOW_EVIL_CONSTRUCTORS(ShutdownDecoderAction);
};

struct NuPlayer::PostMessageAction : public Action {
    PostMessageAction(const sp<AMessage> &msg)
        : mMessage(msg) {
    }

    virtual void execute(NuPlayer *) {
        mMessage->post();
    }

private:
    sp<AMessage> mMessage;

    DISALLOW_EVIL_CONSTRUCTORS(PostMessageAction);
};

// Use this if there's no state necessary to save in order to execute
// the action.
struct NuPlayer::SimpleAction : public Action {
    typedef void (NuPlayer::*ActionFunc)();

    SimpleAction(ActionFunc func)
        : mFunc(func) {
    }

    virtual void execute(NuPlayer *player) {
        (player->*mFunc)();
    }

private:
    ActionFunc mFunc;

    DISALLOW_EVIL_CONSTRUCTORS(SimpleAction);
};

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

NuPlayer::NuPlayer()
    : mUIDValid(false),
      mSourceFlags(0),
      mCurrentPositionUs(0),
      mVideoIsAVC(false),
      mOffloadAudio(false),
      mCurrentOffloadInfo(AUDIO_INFO_INITIALIZER),
      mAudioDecoderGeneration(0),
      mVideoDecoderGeneration(0),
      mAudioEOS(false),
      mVideoEOS(false),
      mScanSourcesPending(false),
      mScanSourcesGeneration(0),
      mPollDurationGeneration(0),
      mTimedTextGeneration(0),
      mTimeDiscontinuityPending(false),
      mFlushingAudio(NONE),
      mFlushingVideo(NONE),
      mSkipRenderingAudioUntilMediaTimeUs(-1ll),
      mSkipRenderingVideoUntilMediaTimeUs(-1ll),
      mVideoLateByUs(0ll),
      mNumFramesTotal(0ll),
      mNumFramesDropped(0ll),
      mVideoScalingMode(NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW),
      mStarted(false) {
}

NuPlayer::~NuPlayer() {
}

void NuPlayer::setUID(uid_t uid) {
    mUIDValid = true;
    mUID = uid;
}

void NuPlayer::setDriver(const wp<NuPlayerDriver> &driver) {
    mDriver = driver;
}

void NuPlayer::setDataSourceAsync(const sp<IStreamSource> &source) {
    sp<AMessage> msg = new AMessage(kWhatSetDataSource, id());

    sp<AMessage> notify = new AMessage(kWhatSourceNotify, id());

    msg->setObject("source", new StreamingSource(notify, source));
    msg->post();
}

static bool IsHTTPLiveURL(const char *url) {
    if (!strncasecmp("http://", url, 7)
            || !strncasecmp("https://", url, 8)
            || !strncasecmp("file://", url, 7)) {
        size_t len = strlen(url);
        if (len >= 5 && !strcasecmp(".m3u8", &url[len - 5])) {
            return true;
        }

        if (strstr(url,"m3u8")) {
            return true;
        }
    }

    return false;
}

void NuPlayer::setDataSourceAsync(
        const sp<IMediaHTTPService> &httpService,
        const char *url,
        const KeyedVector<String8, String8> *headers) {

    sp<AMessage> msg = new AMessage(kWhatSetDataSource, id());
    size_t len = strlen(url);

    sp<AMessage> notify = new AMessage(kWhatSourceNotify, id());

    sp<Source> source;
    if (IsHTTPLiveURL(url)) {
        source = new HTTPLiveSource(notify, httpService, url, headers);
    } else if (!strncasecmp(url, "rtsp://", 7)) {
        source = new RTSPSource(
                notify, httpService, url, headers, mUIDValid, mUID);
    } else if ((!strncasecmp(url, "http://", 7)
                || !strncasecmp(url, "https://", 8))
                    && ((len >= 4 && !strcasecmp(".sdp", &url[len - 4]))
                    || strstr(url, ".sdp?"))) {
        source = new RTSPSource(
                notify, httpService, url, headers, mUIDValid, mUID, true);
    } else {
        sp<GenericSource> genericSource =
                new GenericSource(notify, mUIDValid, mUID);
        // Don't set FLAG_SECURE on mSourceFlags here for widevine.
        // The correct flags will be updated in Source::kWhatFlagsChanged
        // handler when  GenericSource is prepared.

        status_t err = genericSource->setDataSource(httpService, url, headers);

        if (err == OK) {
            source = genericSource;
        } else {
            ALOGE("Failed to set data source!");
        }
    }
    msg->setObject("source", source);
    msg->post();
}

void NuPlayer::setDataSourceAsync(int fd, int64_t offset, int64_t length) {
    sp<AMessage> msg = new AMessage(kWhatSetDataSource, id());

    sp<AMessage> notify = new AMessage(kWhatSourceNotify, id());

    sp<GenericSource> source =
            new GenericSource(notify, mUIDValid, mUID);

    status_t err = source->setDataSource(fd, offset, length);

    if (err != OK) {
        ALOGE("Failed to set data source!");
        source = NULL;
    }

    msg->setObject("source", source);
    msg->post();
}

void NuPlayer::prepareAsync() {
    (new AMessage(kWhatPrepare, id()))->post();
}

void NuPlayer::setVideoSurfaceTextureAsync(
        const sp<IGraphicBufferProducer> &bufferProducer) {
    sp<AMessage> msg = new AMessage(kWhatSetVideoNativeWindow, id());

    if (bufferProducer == NULL) {
        msg->setObject("native-window", NULL);
    } else {
        msg->setObject(
                "native-window",
                new NativeWindowWrapper(
                    new Surface(bufferProducer, true /* controlledByApp */)));
    }

    msg->post();
}

void NuPlayer::setAudioSink(const sp<MediaPlayerBase::AudioSink> &sink) {
    sp<AMessage> msg = new AMessage(kWhatSetAudioSink, id());
    msg->setObject("sink", sink);
    msg->post();
}

void NuPlayer::start() {
    (new AMessage(kWhatStart, id()))->post();
}

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

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

void NuPlayer::resetAsync() {
    (new AMessage(kWhatReset, id()))->post();
}

void NuPlayer::seekToAsync(int64_t seekTimeUs) {
    sp<AMessage> msg = new AMessage(kWhatSeek, id());
    msg->setInt64("seekTimeUs", seekTimeUs);
    msg->post();
}

// static
bool NuPlayer::IsFlushingState(FlushStatus state, bool *needShutdown) {
    switch (state) {
        case FLUSHING_DECODER:
            if (needShutdown != NULL) {
                *needShutdown = false;
            }
            return true;

        case FLUSHING_DECODER_SHUTDOWN:
            if (needShutdown != NULL) {
                *needShutdown = true;
            }
            return true;

        default:
            return false;
    }
}

void NuPlayer::writeTrackInfo(
        Parcel* reply, const sp<AMessage> format) const {
    int32_t trackType;
    CHECK(format->findInt32("type", &trackType));

    AString lang;
    CHECK(format->findString("language", &lang));

    reply->writeInt32(2); // write something non-zero
    reply->writeInt32(trackType);
    reply->writeString16(String16(lang.c_str()));

    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
        AString mime;
        CHECK(format->findString("mime", &mime));

        int32_t isAuto, isDefault, isForced;
        CHECK(format->findInt32("auto", &isAuto));
        CHECK(format->findInt32("default", &isDefault));
        CHECK(format->findInt32("forced", &isForced));

        reply->writeString16(String16(mime.c_str()));
        reply->writeInt32(isAuto);
        reply->writeInt32(isDefault);
        reply->writeInt32(isForced);
    }
}

void NuPlayer::onMessageReceived(const sp<AMessage> &msg) {
    switch (msg->what()) {
        case kWhatSetDataSource:
        {
            ALOGV("kWhatSetDataSource");

            CHECK(mSource == NULL);

            status_t err = OK;
            sp<RefBase> obj;
            CHECK(msg->findObject("source", &obj));
            if (obj != NULL) {
                mSource = static_cast<Source *>(obj.get());
            } else {
                err = UNKNOWN_ERROR;
            }

            CHECK(mDriver != NULL);
            sp<NuPlayerDriver> driver = mDriver.promote();
            if (driver != NULL) {
                driver->notifySetDataSourceCompleted(err);
            }
            break;
        }

        case kWhatPrepare:
        {
            mSource->prepareAsync();
            break;
        }

        case kWhatGetTrackInfo:
        {
            uint32_t replyID;
            CHECK(msg->senderAwaitsResponse(&replyID));

            Parcel* reply;
            CHECK(msg->findPointer("reply", (void**)&reply));

            size_t inbandTracks = 0;
            if (mSource != NULL) {
                inbandTracks = mSource->getTrackCount();
            }

            size_t ccTracks = 0;
            if (mCCDecoder != NULL) {
                ccTracks = mCCDecoder->getTrackCount();
            }

            // total track count
            reply->writeInt32(inbandTracks + ccTracks);

            // write inband tracks
            for (size_t i = 0; i < inbandTracks; ++i) {
                writeTrackInfo(reply, mSource->getTrackInfo(i));
            }

            // write CC track
            for (size_t i = 0; i < ccTracks; ++i) {
                writeTrackInfo(reply, mCCDecoder->getTrackInfo(i));
            }

            sp<AMessage> response = new AMessage;
            response->postReply(replyID);
            break;
        }

        case kWhatGetSelectedTrack:
        {
            status_t err = INVALID_OPERATION;
            if (mSource != NULL) {
                err = OK;

                int32_t type32;
                CHECK(msg->findInt32("type", (int32_t*)&type32));
                media_track_type type = (media_track_type)type32;
                ssize_t selectedTrack = mSource->getSelectedTrack(type);

                Parcel* reply;
                CHECK(msg->findPointer("reply", (void**)&reply));
                reply->writeInt32(selectedTrack);
            }

            sp<AMessage> response = new AMessage;
            response->setInt32("err", err);

            uint32_t replyID;
            CHECK(msg->senderAwaitsResponse(&replyID));
            response->postReply(replyID);
            break;
        }

        case kWhatSelectTrack:
        {
            uint32_t replyID;
            CHECK(msg->senderAwaitsResponse(&replyID));

            size_t trackIndex;
            int32_t select;
            CHECK(msg->findSize("trackIndex", &trackIndex));
            CHECK(msg->findInt32("select", &select));

            status_t err = INVALID_OPERATION;

            size_t inbandTracks = 0;
            if (mSource != NULL) {
                inbandTracks = mSource->getTrackCount();
            }
            size_t ccTracks = 0;
            if (mCCDecoder != NULL) {
                ccTracks = mCCDecoder->getTrackCount();
            }

            if (trackIndex < inbandTracks) {
                err = mSource->selectTrack(trackIndex, select);

                if (!select && err == OK) {
                    int32_t type;
                    sp<AMessage> info = mSource->getTrackInfo(trackIndex);
                    if (info != NULL
                            && info->findInt32("type", &type)
                            && type == MEDIA_TRACK_TYPE_TIMEDTEXT) {
                        ++mTimedTextGeneration;
                    }
                }
            } else {
                trackIndex -= inbandTracks;

                if (trackIndex < ccTracks) {
                    err = mCCDecoder->selectTrack(trackIndex, select);
                }
            }

            sp<AMessage> response = new AMessage;
            response->setInt32("err", err);

            response->postReply(replyID);
            break;
        }

        case kWhatPollDuration:
        {
            int32_t generation;
            CHECK(msg->findInt32("generation", &generation));

            if (generation != mPollDurationGeneration) {
                // stale
                break;
            }

            int64_t durationUs;
            if (mDriver != NULL && mSource->getDuration(&durationUs) == OK) {
                sp<NuPlayerDriver> driver = mDriver.promote();
                if (driver != NULL) {
                    driver->notifyDuration(durationUs);
                }
            }

            msg->post(1000000ll);  // poll again in a second.
            break;
        }

        case kWhatSetVideoNativeWindow:
        {
            ALOGV("kWhatSetVideoNativeWindow");

            mDeferredActions.push_back(
                    new ShutdownDecoderAction(
                        false /* audio */, true /* video */));

            sp<RefBase> obj;
            CHECK(msg->findObject("native-window", &obj));

            mDeferredActions.push_back(
                    new SetSurfaceAction(
                        static_cast<NativeWindowWrapper *>(obj.get())));

            if (obj != NULL) {
                mDeferredActions.push_back(new SeekAction(mCurrentPositionUs));

                // If there is a new surface texture, instantiate decoders
                // again if possible.
                mDeferredActions.push_back(
                        new SimpleAction(&NuPlayer::performScanSources));
            }

            processDeferredActions();
            break;
        }

        case kWhatSetAudioSink:
        {
            ALOGV("kWhatSetAudioSink");

            sp<RefBase> obj;
            CHECK(msg->findObject("sink", &obj));

            mAudioSink = static_cast<MediaPlayerBase::AudioSink *>(obj.get());
            break;
        }

        case kWhatStart:
        {
            ALOGV("kWhatStart");

            mVideoIsAVC = false;
            mOffloadAudio = false;
            mAudioEOS = false;
            mVideoEOS = false;
            mSkipRenderingAudioUntilMediaTimeUs = -1;
            mSkipRenderingVideoUntilMediaTimeUs = -1;
            mVideoLateByUs = 0;
            mNumFramesTotal = 0;
            mNumFramesDropped = 0;
            mStarted = true;

            /* instantiate decoders now for secure playback */
            if (mSourceFlags & Source::FLAG_SECURE) {
                if (mNativeWindow != NULL) {
                    instantiateDecoder(false, &mVideoDecoder);
                }

                if (mAudioSink != NULL) {
                    instantiateDecoder(true, &mAudioDecoder);
                }
            }

            mSource->start();

            uint32_t flags = 0;

            if (mSource->isRealTime()) {
                flags |= Renderer::FLAG_REAL_TIME;
            }

            sp<MetaData> audioMeta = mSource->getFormatMeta(true /* audio */);
            audio_stream_type_t streamType = AUDIO_STREAM_MUSIC;
            if (mAudioSink != NULL) {
                streamType = mAudioSink->getAudioStreamType();
            }

            sp<AMessage> videoFormat = mSource->getFormat(false /* audio */);

            mOffloadAudio =
                canOffloadStream(audioMeta, (videoFormat != NULL),
                                 true /* is_streaming */, streamType);
            if (mOffloadAudio) {
                flags |= Renderer::FLAG_OFFLOAD_AUDIO;
            }

            mRenderer = new Renderer(
                    mAudioSink,
                    new AMessage(kWhatRendererNotify, id()),
                    flags);

            mRendererLooper = new ALooper;
            mRendererLooper->setName("NuPlayerRenderer");
            mRendererLooper->start(false, false, ANDROID_PRIORITY_AUDIO);
            mRendererLooper->registerHandler(mRenderer);

            postScanSources();
            break;
        }

        case kWhatScanSources:
        {
            int32_t generation;
            CHECK(msg->findInt32("generation", &generation));
            if (generation != mScanSourcesGeneration) {
                // Drop obsolete msg.
                break;
            }

            mScanSourcesPending = false;

            ALOGV("scanning sources haveAudio=%d, haveVideo=%d",
                 mAudioDecoder != NULL, mVideoDecoder != NULL);

            bool mHadAnySourcesBefore =
                (mAudioDecoder != NULL) || (mVideoDecoder != NULL);

            // initialize video before audio because successful initialization of
            // video may change deep buffer mode of audio.
            if (mNativeWindow != NULL) {
                instantiateDecoder(false, &mVideoDecoder);
            }

            if (mAudioSink != NULL) {
                if (mOffloadAudio) {
                    // open audio sink early under offload mode.
                    sp<AMessage> format = mSource->getFormat(true /*audio*/);
                    openAudioSink(format, true /*offloadOnly*/);
                }
                instantiateDecoder(true, &mAudioDecoder);
            }

            if (!mHadAnySourcesBefore
                    && (mAudioDecoder != NULL || mVideoDecoder != NULL)) {
                // This is the first time we've found anything playable.

                if (mSourceFlags & Source::FLAG_DYNAMIC_DURATION) {
                    schedulePollDuration();
                }
            }

            status_t err;
            if ((err = mSource->feedMoreTSData()) != OK) {
                if (mAudioDecoder == NULL && mVideoDecoder == NULL) {
                    // We're not currently decoding anything (no audio or
                    // video tracks found) and we just ran out of input data.

                    if (err == ERROR_END_OF_STREAM) {
                        notifyListener(MEDIA_PLAYBACK_COMPLETE, 0, 0);
                    } else {
                        notifyListener(MEDIA_ERROR, MEDIA_ERROR_UNKNOWN, err);
                    }
                }
                break;
            }

            if ((mAudioDecoder == NULL && mAudioSink != NULL)
                    || (mVideoDecoder == NULL && mNativeWindow != NULL)) {
                msg->post(100000ll);
                mScanSourcesPending = true;
            }
            break;
        }

        case kWhatVideoNotify:
        case kWhatAudioNotify:
        {
            bool audio = msg->what() == kWhatAudioNotify;

            int32_t currentDecoderGeneration =
                (audio? mAudioDecoderGeneration : mVideoDecoderGeneration);
            int32_t requesterGeneration = currentDecoderGeneration - 1;
            CHECK(msg->findInt32("generation", &requesterGeneration));

            if (requesterGeneration != currentDecoderGeneration) {
                ALOGV("got message from old %s decoder, generation(%d:%d)",
                        audio ? "audio" : "video", requesterGeneration,
                        currentDecoderGeneration);
                sp<AMessage> reply;
                if (!(msg->findMessage("reply", &reply))) {
                    return;
                }

                reply->setInt32("err", INFO_DISCONTINUITY);
                reply->post();
                return;
            }

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

            if (what == Decoder::kWhatFillThisBuffer) {
                status_t err = feedDecoderInputData(
                        audio, msg);

                if (err == -EWOULDBLOCK) {
                    if (mSource->feedMoreTSData() == OK) {
                        msg->post(10000ll);
                    }
                }
            } else if (what == Decoder::kWhatEOS) {
                int32_t err;
                CHECK(msg->findInt32("err", &err));

                if (err == ERROR_END_OF_STREAM) {
                    ALOGV("got %s decoder EOS", audio ? "audio" : "video");
                } else {
                    ALOGV("got %s decoder EOS w/ error %d",
                         audio ? "audio" : "video",
                         err);
                }

                mRenderer->queueEOS(audio, err);
            } else if (what == Decoder::kWhatFlushCompleted) {
                bool needShutdown;

                if (audio) {
                    CHECK(IsFlushingState(mFlushingAudio, &needShutdown));
                    mFlushingAudio = FLUSHED;
                } else {
                    CHECK(IsFlushingState(mFlushingVideo, &needShutdown));
                    mFlushingVideo = FLUSHED;

                    mVideoLateByUs = 0;
                }

                ALOGV("decoder %s flush completed", audio ? "audio" : "video");

                if (needShutdown) {
                    ALOGV("initiating %s decoder shutdown",
                         audio ? "audio" : "video");

                    getDecoder(audio)->initiateShutdown();

                    if (audio) {
                        mFlushingAudio = SHUTTING_DOWN_DECODER;
                    } else {
                        mFlushingVideo = SHUTTING_DOWN_DECODER;
                    }
                }

                finishFlushIfPossible();
            } else if (what == Decoder::kWhatOutputFormatChanged) {
                sp<AMessage> format;
                CHECK(msg->findMessage("format", &format));

                if (audio) {
                    openAudioSink(format, false /*offloadOnly*/);
                } else {
                    // video
                    sp<AMessage> inputFormat =
                            mSource->getFormat(false /* audio */);

                    updateVideoSize(inputFormat, format);
                }
            } else if (what == Decoder::kWhatShutdownCompleted) {
                ALOGV("%s shutdown completed", audio ? "audio" : "video");
                if (audio) {
                    mAudioDecoder.clear();

                    CHECK_EQ((int)mFlushingAudio, (int)SHUTTING_DOWN_DECODER);
                    mFlushingAudio = SHUT_DOWN;
                } else {
                    mVideoDecoder.clear();

                    CHECK_EQ((int)mFlushingVideo, (int)SHUTTING_DOWN_DECODER);
                    mFlushingVideo = SHUT_DOWN;
                }

                finishFlushIfPossible();
            } else if (what == Decoder::kWhatError) {
                ALOGE("Received error from %s decoder, aborting playback.",
                     audio ? "audio" : "video");

                status_t err;
                if (!msg->findInt32("err", &err)) {
                    err = UNKNOWN_ERROR;
                }
                mRenderer->queueEOS(audio, err);
                if (audio && mFlushingAudio != NONE) {
                    mAudioDecoder.clear();
                    mFlushingAudio = SHUT_DOWN;
                } else if (!audio && mFlushingVideo != NONE){
                    mVideoDecoder.clear();
                    mFlushingVideo = SHUT_DOWN;
                }
                finishFlushIfPossible();
            } else if (what == Decoder::kWhatDrainThisBuffer) {
                renderBuffer(audio, msg);
            } else {
                ALOGV("Unhandled decoder notification %d '%c%c%c%c'.",
                      what,
                      what >> 24,
                      (what >> 16) & 0xff,
                      (what >> 8) & 0xff,
                      what & 0xff);
            }

            break;
        }

        case kWhatRendererNotify:
        {
            int32_t what;
            CHECK(msg->findInt32("what", &what));

            if (what == Renderer::kWhatEOS) {
                int32_t audio;
                CHECK(msg->findInt32("audio", &audio));

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

                if (audio) {
                    mAudioEOS = true;
                } else {
                    mVideoEOS = true;
                }

                if (finalResult == ERROR_END_OF_STREAM) {
                    ALOGV("reached %s EOS", audio ? "audio" : "video");
                } else {
                    ALOGE("%s track encountered an error (%d)",
                         audio ? "audio" : "video", finalResult);

                    notifyListener(
                            MEDIA_ERROR, MEDIA_ERROR_UNKNOWN, finalResult);
                }

                if ((mAudioEOS || mAudioDecoder == NULL)
                        && (mVideoEOS || mVideoDecoder == NULL)) {
                    notifyListener(MEDIA_PLAYBACK_COMPLETE, 0, 0);
                }
            } else if (what == Renderer::kWhatPosition) {
                int64_t positionUs;
                CHECK(msg->findInt64("positionUs", &positionUs));
                mCurrentPositionUs = positionUs;

                CHECK(msg->findInt64("videoLateByUs", &mVideoLateByUs));

                if (mDriver != NULL) {
                    sp<NuPlayerDriver> driver = mDriver.promote();
                    if (driver != NULL) {
                        driver->notifyPosition(positionUs);

                        driver->notifyFrameStats(
                                mNumFramesTotal, mNumFramesDropped);
                    }
                }
            } else if (what == Renderer::kWhatFlushComplete) {
                int32_t audio;
                CHECK(msg->findInt32("audio", &audio));

                ALOGV("renderer %s flush completed.", audio ? "audio" : "video");
            } else if (what == Renderer::kWhatVideoRenderingStart) {
                notifyListener(MEDIA_INFO, MEDIA_INFO_RENDERING_START, 0);
            } else if (what == Renderer::kWhatMediaRenderingStart) {
                ALOGV("media rendering started");
                notifyListener(MEDIA_STARTED, 0, 0);
            } else if (what == Renderer::kWhatAudioOffloadTearDown) {
                ALOGV("Tear down audio offload, fall back to s/w path");
                int64_t positionUs;
                CHECK(msg->findInt64("positionUs", &positionUs));
                closeAudioSink();
                mAudioDecoder.clear();
                mRenderer->flush(true /* audio */);
                if (mVideoDecoder != NULL) {
                    mRenderer->flush(false /* audio */);
                }
                mRenderer->signalDisableOffloadAudio();
                mOffloadAudio = false;

                performSeek(positionUs);
                instantiateDecoder(true /* audio */, &mAudioDecoder);
            }
            break;
        }

        case kWhatMoreDataQueued:
        {
            break;
        }

        case kWhatReset:
        {
            ALOGV("kWhatReset");

            mDeferredActions.push_back(
                    new ShutdownDecoderAction(
                        true /* audio */, true /* video */));

            mDeferredActions.push_back(
                    new SimpleAction(&NuPlayer::performReset));

            processDeferredActions();
            break;
        }

        case kWhatSeek:
        {
            int64_t seekTimeUs;
            CHECK(msg->findInt64("seekTimeUs", &seekTimeUs));

            ALOGV("kWhatSeek seekTimeUs=%lld us", seekTimeUs);

            mDeferredActions.push_back(
                    new SimpleAction(&NuPlayer::performDecoderFlush));

            mDeferredActions.push_back(new SeekAction(seekTimeUs));

            processDeferredActions();
            break;
        }

        case kWhatPause:
        {
            CHECK(mRenderer != NULL);
            mSource->pause();
            mRenderer->pause();
            break;
        }

        case kWhatResume:
        {
            CHECK(mRenderer != NULL);
            mSource->resume();
            mRenderer->resume();
            break;
        }

        case kWhatSourceNotify:
        {
            onSourceNotify(msg);
            break;
        }

        case kWhatClosedCaptionNotify:
        {
            onClosedCaptionNotify(msg);
            break;
        }

        default:
            TRESPASS();
            break;
    }
}

void NuPlayer::finishFlushIfPossible() {
    if (mFlushingAudio != NONE && mFlushingAudio != FLUSHED
            && mFlushingAudio != SHUT_DOWN) {
        return;
    }

    if (mFlushingVideo != NONE && mFlushingVideo != FLUSHED
            && mFlushingVideo != SHUT_DOWN) {
        return;
    }

    ALOGV("both audio and video are flushed now.");

    if (mTimeDiscontinuityPending) {
        mRenderer->signalTimeDiscontinuity();
        mTimeDiscontinuityPending = false;
    }

    if (mAudioDecoder != NULL && mFlushingAudio == FLUSHED) {
        mAudioDecoder->signalResume();
    }

    if (mVideoDecoder != NULL && mFlushingVideo == FLUSHED) {
        mVideoDecoder->signalResume();
    }

    mFlushingAudio = NONE;
    mFlushingVideo = NONE;

    processDeferredActions();
}

void NuPlayer::postScanSources() {
    if (mScanSourcesPending) {
        return;
    }

    sp<AMessage> msg = new AMessage(kWhatScanSources, id());
    msg->setInt32("generation", mScanSourcesGeneration);
    msg->post();

    mScanSourcesPending = true;
}

void NuPlayer::openAudioSink(const sp<AMessage> &format, bool offloadOnly) {
    ALOGV("openAudioSink: offloadOnly(%d) mOffloadAudio(%d)",
            offloadOnly, mOffloadAudio);
    bool audioSinkChanged = false;

    int32_t numChannels;
    CHECK(format->findInt32("channel-count", &numChannels));

    int32_t channelMask;
    if (!format->findInt32("channel-mask", &channelMask)) {
        // signal to the AudioSink to derive the mask from count.
        channelMask = CHANNEL_MASK_USE_CHANNEL_ORDER;
    }

    int32_t sampleRate;
    CHECK(format->findInt32("sample-rate", &sampleRate));

    uint32_t flags;
    int64_t durationUs;
    // FIXME: we should handle the case where the video decoder
    // is created after we receive the format change indication.
    // Current code will just make that we select deep buffer
    // with video which should not be a problem as it should
    // not prevent from keeping A/V sync.
    if (mVideoDecoder == NULL &&
            mSource->getDuration(&durationUs) == OK &&
            durationUs
                > AUDIO_SINK_MIN_DEEP_BUFFER_DURATION_US) {
        flags = AUDIO_OUTPUT_FLAG_DEEP_BUFFER;
    } else {
        flags = AUDIO_OUTPUT_FLAG_NONE;
    }

    if (mOffloadAudio) {
        audio_format_t audioFormat = AUDIO_FORMAT_PCM_16_BIT;
        AString mime;
        CHECK(format->findString("mime", &mime));
        status_t err = mapMimeToAudioFormat(audioFormat, mime.c_str());

        if (err != OK) {
            ALOGE("Couldn't map mime \"%s\" to a valid "
                    "audio_format", mime.c_str());
            mOffloadAudio = false;
        } else {
            ALOGV("Mime \"%s\" mapped to audio_format 0x%x",
                    mime.c_str(), audioFormat);

            int avgBitRate = -1;
            format->findInt32("bit-rate", &avgBitRate);

            int32_t aacProfile = -1;
            if (audioFormat == AUDIO_FORMAT_AAC
                    && format->findInt32("aac-profile", &aacProfile)) {
                // Redefine AAC format as per aac profile
                mapAACProfileToAudioFormat(
                        audioFormat,
                        aacProfile);
            }

            audio_offload_info_t offloadInfo = AUDIO_INFO_INITIALIZER;
            offloadInfo.duration_us = -1;
            format->findInt64(
                    "durationUs", &offloadInfo.duration_us);
            offloadInfo.sample_rate = sampleRate;
            offloadInfo.channel_mask = channelMask;
            offloadInfo.format = audioFormat;
            offloadInfo.stream_type = AUDIO_STREAM_MUSIC;
            offloadInfo.bit_rate = avgBitRate;
            offloadInfo.has_video = (mVideoDecoder != NULL);
            offloadInfo.is_streaming = true;

            if (memcmp(&mCurrentOffloadInfo, &offloadInfo, sizeof(offloadInfo)) == 0) {
                ALOGV("openAudioSink: no change in offload mode");
                return;  // no change from previous configuration, everything ok.
            }
            ALOGV("openAudioSink: try to open AudioSink in offload mode");
            flags |= AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD;
            flags &= ~AUDIO_OUTPUT_FLAG_DEEP_BUFFER;
            audioSinkChanged = true;
            mAudioSink->close();
            err = mAudioSink->open(
                    sampleRate,
                    numChannels,
                    (audio_channel_mask_t)channelMask,
                    audioFormat,
                    8 /* bufferCount */,
                    &NuPlayer::Renderer::AudioSinkCallback,
                    mRenderer.get(),
                    (audio_output_flags_t)flags,
                    &offloadInfo);

            if (err == OK) {
                // If the playback is offloaded to h/w, we pass
                // the HAL some metadata information.
                // We don't want to do this for PCM because it
                // will be going through the AudioFlinger mixer
                // before reaching the hardware.
                sp<MetaData> audioMeta =
                        mSource->getFormatMeta(true /* audio */);
                sendMetaDataToHal(mAudioSink, audioMeta);
                mCurrentOffloadInfo = offloadInfo;
                err = mAudioSink->start();
                ALOGV_IF(err == OK, "openAudioSink: offload succeeded");
            }
            if (err != OK) {
                // Clean up, fall back to non offload mode.
                mAudioSink->close();
                mRenderer->signalDisableOffloadAudio();
                mOffloadAudio = false;
                mCurrentOffloadInfo = AUDIO_INFO_INITIALIZER;
                ALOGV("openAudioSink: offload failed");
            }
        }
    }
    if (!offloadOnly && !mOffloadAudio) {
        flags &= ~AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD;
        ALOGV("openAudioSink: open AudioSink in NON-offload mode");

        audioSinkChanged = true;
        mAudioSink->close();
        mCurrentOffloadInfo = AUDIO_INFO_INITIALIZER;
        CHECK_EQ(mAudioSink->open(
                    sampleRate,
                    numChannels,
                    (audio_channel_mask_t)channelMask,
                    AUDIO_FORMAT_PCM_16_BIT,
                    8 /* bufferCount */,
                    NULL,
                    NULL,
                    (audio_output_flags_t)flags),
                 (status_t)OK);
        mAudioSink->start();
    }
    if (audioSinkChanged) {
        mRenderer->signalAudioSinkChanged();
    }
}

void NuPlayer::closeAudioSink() {
    mAudioSink->close();
    mCurrentOffloadInfo = AUDIO_INFO_INITIALIZER;
}

status_t NuPlayer::instantiateDecoder(bool audio, sp<Decoder> *decoder) {
    if (*decoder != NULL) {
        return OK;
    }

    sp<AMessage> format = mSource->getFormat(audio);

    if (format == NULL) {
        return -EWOULDBLOCK;
    }

    if (!audio) {
        AString mime;
        CHECK(format->findString("mime", &mime));
        mVideoIsAVC = !strcasecmp(MEDIA_MIMETYPE_VIDEO_AVC, mime.c_str());

        sp<AMessage> ccNotify = new AMessage(kWhatClosedCaptionNotify, id());
        mCCDecoder = new CCDecoder(ccNotify);

        if (mSourceFlags & Source::FLAG_SECURE) {
            format->setInt32("secure", true);
        }
    }

    if (audio) {
        sp<AMessage> notify = new AMessage(kWhatAudioNotify, id());
        ++mAudioDecoderGeneration;
        notify->setInt32("generation", mAudioDecoderGeneration);

        if (mOffloadAudio) {
            *decoder = new DecoderPassThrough(notify);
        } else {
            *decoder = new Decoder(notify);
        }
    } else {
        sp<AMessage> notify = new AMessage(kWhatVideoNotify, id());
        ++mVideoDecoderGeneration;
        notify->setInt32("generation", mVideoDecoderGeneration);

        *decoder = new Decoder(notify, mNativeWindow);
    }
    (*decoder)->init();
    (*decoder)->configure(format);

    // allocate buffers to decrypt widevine source buffers
    if (!audio && (mSourceFlags & Source::FLAG_SECURE)) {
        Vector<sp<ABuffer> > inputBufs;
        CHECK_EQ((*decoder)->getInputBuffers(&inputBufs), (status_t)OK);

        Vector<MediaBuffer *> mediaBufs;
        for (size_t i = 0; i < inputBufs.size(); i++) {
            const sp<ABuffer> &buffer = inputBufs[i];
            MediaBuffer *mbuf = new MediaBuffer(buffer->data(), buffer->size());
            mediaBufs.push(mbuf);
        }

        status_t err = mSource->setBuffers(audio, mediaBufs);
        if (err != OK) {
            for (size_t i = 0; i < mediaBufs.size(); ++i) {
                mediaBufs[i]->release();
            }
            mediaBufs.clear();
            ALOGE("Secure source didn't support secure mediaBufs.");
            return err;
        }
    }
    return OK;
}

status_t NuPlayer::feedDecoderInputData(bool audio, const sp<AMessage> &msg) {
    sp<AMessage> reply;
    CHECK(msg->findMessage("reply", &reply));

    if ((audio && mFlushingAudio != NONE)
            || (!audio && mFlushingVideo != NONE)) {
        reply->setInt32("err", INFO_DISCONTINUITY);
        reply->post();
        return OK;
    }

    sp<ABuffer> accessUnit;

    bool dropAccessUnit;
    do {
        status_t err = mSource->dequeueAccessUnit(audio, &accessUnit);

        if (err == -EWOULDBLOCK) {
            return err;
        } else if (err != OK) {
            if (err == INFO_DISCONTINUITY) {
                int32_t type;
                CHECK(accessUnit->meta()->findInt32("discontinuity", &type));

                bool formatChange =
                    (audio &&
                     (type & ATSParser::DISCONTINUITY_AUDIO_FORMAT))
                    || (!audio &&
                            (type & ATSParser::DISCONTINUITY_VIDEO_FORMAT));

                bool timeChange = (type & ATSParser::DISCONTINUITY_TIME) != 0;

                ALOGI("%s discontinuity (formatChange=%d, time=%d)",
                     audio ? "audio" : "video", formatChange, timeChange);

                if (audio) {
                    mSkipRenderingAudioUntilMediaTimeUs = -1;
                } else {
                    mSkipRenderingVideoUntilMediaTimeUs = -1;
                }

                if (timeChange) {
                    sp<AMessage> extra;
                    if (accessUnit->meta()->findMessage("extra", &extra)
                            && extra != NULL) {
                        int64_t resumeAtMediaTimeUs;
                        if (extra->findInt64(
                                    "resume-at-mediatimeUs", &resumeAtMediaTimeUs)) {
                            ALOGI("suppressing rendering of %s until %lld us",
                                    audio ? "audio" : "video", resumeAtMediaTimeUs);

                            if (audio) {
                                mSkipRenderingAudioUntilMediaTimeUs =
                                    resumeAtMediaTimeUs;
                            } else {
                                mSkipRenderingVideoUntilMediaTimeUs =
                                    resumeAtMediaTimeUs;
                            }
                        }
                    }
                }

                mTimeDiscontinuityPending =
                    mTimeDiscontinuityPending || timeChange;

                bool seamlessFormatChange = false;
                sp<AMessage> newFormat = mSource->getFormat(audio);
                if (formatChange) {
                    seamlessFormatChange =
                        getDecoder(audio)->supportsSeamlessFormatChange(newFormat);
                    // treat seamless format change separately
                    formatChange = !seamlessFormatChange;
                }
                bool shutdownOrFlush = formatChange || timeChange;

                // We want to queue up scan-sources only once per discontinuity.
                // We control this by doing it only if neither audio nor video are
                // flushing or shutting down.  (After handling 1st discontinuity, one
                // of the flushing states will not be NONE.)
                // No need to scan sources if this discontinuity does not result
                // in a flush or shutdown, as the flushing state will stay NONE.
                if (mFlushingAudio == NONE && mFlushingVideo == NONE &&
                        shutdownOrFlush) {
                    // And we'll resume scanning sources once we're done
                    // flushing.
                    mDeferredActions.push_front(
                            new SimpleAction(
                                &NuPlayer::performScanSources));
                }

                if (formatChange /* not seamless */) {
                    // must change decoder
                    flushDecoder(audio, /* needShutdown = */ true);
                } else if (timeChange) {
                    // need to flush
                    flushDecoder(audio, /* needShutdown = */ false, newFormat);
                    err = OK;
                } else if (seamlessFormatChange) {
                    // reuse existing decoder and don't flush
                    updateDecoderFormatWithoutFlush(audio, newFormat);
                    err = OK;
                } else {
                    // This stream is unaffected by the discontinuity
                    return -EWOULDBLOCK;
                }
            }

            reply->setInt32("err", err);
            reply->post();
            return OK;
        }

        if (!audio) {
            ++mNumFramesTotal;
        }

        dropAccessUnit = false;
        if (!audio
                && !(mSourceFlags & Source::FLAG_SECURE)
                && mVideoLateByUs > 100000ll
                && mVideoIsAVC
                && !IsAVCReferenceFrame(accessUnit)) {
            dropAccessUnit = true;
            ++mNumFramesDropped;
        }
    } while (dropAccessUnit);

    // ALOGV("returned a valid buffer of %s data", audio ? "audio" : "video");

#if 0
    int64_t mediaTimeUs;
    CHECK(accessUnit->meta()->findInt64("timeUs", &mediaTimeUs));
    ALOGV("feeding %s input buffer at media time %.2f secs",
         audio ? "audio" : "video",
         mediaTimeUs / 1E6);
#endif

    if (!audio) {
        mCCDecoder->decode(accessUnit);
    }

    reply->setBuffer("buffer", accessUnit);
    reply->post();

    return OK;
}

void NuPlayer::renderBuffer(bool audio, const sp<AMessage> &msg) {
    // ALOGV("renderBuffer %s", audio ? "audio" : "video");

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

    if ((audio && mFlushingAudio != NONE)
            || (!audio && mFlushingVideo != NONE)) {
        // We're currently attempting to flush the decoder, in order
        // to complete this, the decoder wants all its buffers back,
        // so we don't want any output buffers it sent us (from before
        // we initiated the flush) to be stuck in the renderer's queue.

        ALOGV("we're still flushing the %s decoder, sending its output buffer"
             " right back.", audio ? "audio" : "video");

        reply->post();
        return;
    }

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

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

    int64_t &skipUntilMediaTimeUs =
        audio
            ? mSkipRenderingAudioUntilMediaTimeUs
            : mSkipRenderingVideoUntilMediaTimeUs;

    if (skipUntilMediaTimeUs >= 0) {

        if (mediaTimeUs < skipUntilMediaTimeUs) {
            ALOGV("dropping %s buffer at time %lld as requested.",
                 audio ? "audio" : "video",
                 mediaTimeUs);

            reply->post();
            return;
        }

        skipUntilMediaTimeUs = -1;
    }

    if (!audio && mCCDecoder->isSelected()) {
        mCCDecoder->display(mediaTimeUs);
    }

    mRenderer->queueBuffer(audio, buffer, reply);
}

void NuPlayer::updateVideoSize(
        const sp<AMessage> &inputFormat,
        const sp<AMessage> &outputFormat) {
    if (inputFormat == NULL) {
        ALOGW("Unknown video size, reporting 0x0!");
        notifyListener(MEDIA_SET_VIDEO_SIZE, 0, 0);
        return;
    }

    int32_t displayWidth, displayHeight;
    int32_t cropLeft, cropTop, cropRight, cropBottom;

    if (outputFormat != NULL) {
        int32_t width, height;
        CHECK(outputFormat->findInt32("width", &width));
        CHECK(outputFormat->findInt32("height", &height));

        int32_t cropLeft, cropTop, cropRight, cropBottom;
        CHECK(outputFormat->findRect(
                    "crop",
                    &cropLeft, &cropTop, &cropRight, &cropBottom));

        displayWidth = cropRight - cropLeft + 1;
        displayHeight = cropBottom - cropTop + 1;

        ALOGV("Video output format changed to %d x %d "
             "(crop: %d x %d @ (%d, %d))",
             width, height,
             displayWidth,
             displayHeight,
             cropLeft, cropTop);
    } else {
        CHECK(inputFormat->findInt32("width", &displayWidth));
        CHECK(inputFormat->findInt32("height", &displayHeight));

        ALOGV("Video input format %d x %d", displayWidth, displayHeight);
    }

    // Take into account sample aspect ratio if necessary:
    int32_t sarWidth, sarHeight;
    if (inputFormat->findInt32("sar-width", &sarWidth)
            && inputFormat->findInt32("sar-height", &sarHeight)) {
        ALOGV("Sample aspect ratio %d : %d", sarWidth, sarHeight);

        displayWidth = (displayWidth * sarWidth) / sarHeight;

        ALOGV("display dimensions %d x %d", displayWidth, displayHeight);
    }

    int32_t rotationDegrees;
    if (!inputFormat->findInt32("rotation-degrees", &rotationDegrees)) {
        rotationDegrees = 0;
    }

    if (rotationDegrees == 90 || rotationDegrees == 270) {
        int32_t tmp = displayWidth;
        displayWidth = displayHeight;
        displayHeight = tmp;
    }

    notifyListener(
            MEDIA_SET_VIDEO_SIZE,
            displayWidth,
            displayHeight);
}

void NuPlayer::notifyListener(int msg, int ext1, int ext2, const Parcel *in) {
    if (mDriver == NULL) {
        return;
    }

    sp<NuPlayerDriver> driver = mDriver.promote();

    if (driver == NULL) {
        return;
    }

    driver->notifyListener(msg, ext1, ext2, in);
}

void NuPlayer::flushDecoder(
        bool audio, bool needShutdown, const sp<AMessage> &newFormat) {
    ALOGV("[%s] flushDecoder needShutdown=%d",
          audio ? "audio" : "video", needShutdown);

    const sp<Decoder> &decoder = getDecoder(audio);
    if (decoder == NULL) {
        ALOGI("flushDecoder %s without decoder present",
             audio ? "audio" : "video");
        return;
    }

    // Make sure we don't continue to scan sources until we finish flushing.
    ++mScanSourcesGeneration;
    mScanSourcesPending = false;

    decoder->signalFlush(newFormat);
    mRenderer->flush(audio);

    FlushStatus newStatus =
        needShutdown ? FLUSHING_DECODER_SHUTDOWN : FLUSHING_DECODER;

    if (audio) {
        ALOGE_IF(mFlushingAudio != NONE,
                "audio flushDecoder() is called in state %d", mFlushingAudio);
        mFlushingAudio = newStatus;
    } else {
        ALOGE_IF(mFlushingVideo != NONE,
                "video flushDecoder() is called in state %d", mFlushingVideo);
        mFlushingVideo = newStatus;
    }
}

void NuPlayer::updateDecoderFormatWithoutFlush(
        bool audio, const sp<AMessage> &format) {
    ALOGV("[%s] updateDecoderFormatWithoutFlush", audio ? "audio" : "video");

    const sp<Decoder> &decoder = getDecoder(audio);
    if (decoder == NULL) {
        ALOGI("updateDecoderFormatWithoutFlush %s without decoder present",
             audio ? "audio" : "video");
        return;
    }

    decoder->signalUpdateFormat(format);
}

void NuPlayer::queueDecoderShutdown(
        bool audio, bool video, const sp<AMessage> &reply) {
    ALOGI("queueDecoderShutdown audio=%d, video=%d", audio, video);

    mDeferredActions.push_back(
            new ShutdownDecoderAction(audio, video));

    mDeferredActions.push_back(
            new SimpleAction(&NuPlayer::performScanSources));

    mDeferredActions.push_back(new PostMessageAction(reply));

    processDeferredActions();
}

status_t NuPlayer::setVideoScalingMode(int32_t mode) {
    mVideoScalingMode = mode;
    if (mNativeWindow != NULL) {
        status_t ret = native_window_set_scaling_mode(
                mNativeWindow->getNativeWindow().get(), mVideoScalingMode);
        if (ret != OK) {
            ALOGE("Failed to set scaling mode (%d): %s",
                -ret, strerror(-ret));
            return ret;
        }
    }
    return OK;
}

status_t NuPlayer::getTrackInfo(Parcel* reply) const {
    sp<AMessage> msg = new AMessage(kWhatGetTrackInfo, id());
    msg->setPointer("reply", reply);

    sp<AMessage> response;
    status_t err = msg->postAndAwaitResponse(&response);
    return err;
}

status_t NuPlayer::getSelectedTrack(int32_t type, Parcel* reply) const {
    sp<AMessage> msg = new AMessage(kWhatGetSelectedTrack, id());
    msg->setPointer("reply", reply);
    msg->setInt32("type", type);

    sp<AMessage> response;
    status_t err = msg->postAndAwaitResponse(&response);
    if (err == OK && response != NULL) {
        CHECK(response->findInt32("err", &err));
    }
    return err;
}

status_t NuPlayer::selectTrack(size_t trackIndex, bool select) {
    sp<AMessage> msg = new AMessage(kWhatSelectTrack, id());
    msg->setSize("trackIndex", trackIndex);
    msg->setInt32("select", select);

    sp<AMessage> response;
    status_t err = msg->postAndAwaitResponse(&response);

    if (err != OK) {
        return err;
    }

    if (!response->findInt32("err", &err)) {
        err = OK;
    }

    return err;
}

void NuPlayer::schedulePollDuration() {
    sp<AMessage> msg = new AMessage(kWhatPollDuration, id());
    msg->setInt32("generation", mPollDurationGeneration);
    msg->post();
}

void NuPlayer::cancelPollDuration() {
    ++mPollDurationGeneration;
}

void NuPlayer::processDeferredActions() {
    while (!mDeferredActions.empty()) {
        // We won't execute any deferred actions until we're no longer in
        // an intermediate state, i.e. one more more decoders are currently
        // flushing or shutting down.

        if (mFlushingAudio != NONE || mFlushingVideo != NONE) {
            // We're currently flushing, postpone the reset until that's
            // completed.

            ALOGV("postponing action mFlushingAudio=%d, mFlushingVideo=%d",
                  mFlushingAudio, mFlushingVideo);

            break;
        }

        sp<Action> action = *mDeferredActions.begin();
        mDeferredActions.erase(mDeferredActions.begin());

        action->execute(this);
    }
}

void NuPlayer::performSeek(int64_t seekTimeUs) {
    ALOGV("performSeek seekTimeUs=%lld us (%.2f secs)",
          seekTimeUs,
          seekTimeUs / 1E6);

    mSource->seekTo(seekTimeUs);
    ++mTimedTextGeneration;

    if (mDriver != NULL) {
        sp<NuPlayerDriver> driver = mDriver.promote();
        if (driver != NULL) {
            driver->notifyPosition(seekTimeUs);
            driver->notifySeekComplete();
        }
    }

    // everything's flushed, continue playback.
}

void NuPlayer::performDecoderFlush() {
    ALOGV("performDecoderFlush");

    if (mAudioDecoder == NULL && mVideoDecoder == NULL) {
        return;
    }

    mTimeDiscontinuityPending = true;

    if (mAudioDecoder != NULL) {
        flushDecoder(true /* audio */, false /* needShutdown */);
    }

    if (mVideoDecoder != NULL) {
        flushDecoder(false /* audio */, false /* needShutdown */);
    }
}

void NuPlayer::performDecoderShutdown(bool audio, bool video) {
    ALOGV("performDecoderShutdown audio=%d, video=%d", audio, video);

    if ((!audio || mAudioDecoder == NULL)
            && (!video || mVideoDecoder == NULL)) {
        return;
    }

    mTimeDiscontinuityPending = true;

    if (audio && mAudioDecoder != NULL) {
        flushDecoder(true /* audio */, true /* needShutdown */);
    }

    if (video && mVideoDecoder != NULL) {
        flushDecoder(false /* audio */, true /* needShutdown */);
    }
}

void NuPlayer::performReset() {
    ALOGV("performReset");

    CHECK(mAudioDecoder == NULL);
    CHECK(mVideoDecoder == NULL);

    cancelPollDuration();

    ++mScanSourcesGeneration;
    mScanSourcesPending = false;

    if (mRendererLooper != NULL) {
        if (mRenderer != NULL) {
            mRendererLooper->unregisterHandler(mRenderer->id());
        }
        mRendererLooper->stop();
        mRendererLooper.clear();
    }
    mRenderer.clear();

    if (mSource != NULL) {
        mSource->stop();

        mSource.clear();
    }

    if (mDriver != NULL) {
        sp<NuPlayerDriver> driver = mDriver.promote();
        if (driver != NULL) {
            driver->notifyResetComplete();
        }
    }

    mStarted = false;
}

void NuPlayer::performScanSources() {
    ALOGV("performScanSources");

    if (!mStarted) {
        return;
    }

    if (mAudioDecoder == NULL || mVideoDecoder == NULL) {
        postScanSources();
    }
}

void NuPlayer::performSetSurface(const sp<NativeWindowWrapper> &wrapper) {
    ALOGV("performSetSurface");

    mNativeWindow = wrapper;

    // XXX - ignore error from setVideoScalingMode for now
    setVideoScalingMode(mVideoScalingMode);

    if (mDriver != NULL) {
        sp<NuPlayerDriver> driver = mDriver.promote();
        if (driver != NULL) {
            driver->notifySetSurfaceComplete();
        }
    }
}

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

    switch (what) {
        case Source::kWhatPrepared:
        {
            if (mSource == NULL) {
                // This is a stale notification from a source that was
                // asynchronously preparing when the client called reset().
                // We handled the reset, the source is gone.
                break;
            }

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

            sp<NuPlayerDriver> driver = mDriver.promote();
            if (driver != NULL) {
                // notify duration first, so that it's definitely set when
                // the app received the "prepare complete" callback.
                int64_t durationUs;
                if (mSource->getDuration(&durationUs) == OK) {
                    driver->notifyDuration(durationUs);
                }
                driver->notifyPrepareCompleted(err);
            }

            break;
        }

        case Source::kWhatFlagsChanged:
        {
            uint32_t flags;
            CHECK(msg->findInt32("flags", (int32_t *)&flags));

            sp<NuPlayerDriver> driver = mDriver.promote();
            if (driver != NULL) {
                driver->notifyFlagsChanged(flags);
            }

            if ((mSourceFlags & Source::FLAG_DYNAMIC_DURATION)
                    && (!(flags & Source::FLAG_DYNAMIC_DURATION))) {
                cancelPollDuration();
            } else if (!(mSourceFlags & Source::FLAG_DYNAMIC_DURATION)
                    && (flags & Source::FLAG_DYNAMIC_DURATION)
                    && (mAudioDecoder != NULL || mVideoDecoder != NULL)) {
                schedulePollDuration();
            }

            mSourceFlags = flags;
            break;
        }

        case Source::kWhatVideoSizeChanged:
        {
            sp<AMessage> format;
            CHECK(msg->findMessage("format", &format));

            updateVideoSize(format);
            break;
        }

        case Source::kWhatBufferingUpdate:
        {
            int32_t percentage;
            CHECK(msg->findInt32("percentage", &percentage));

            notifyListener(MEDIA_BUFFERING_UPDATE, percentage, 0);
            break;
        }

        case Source::kWhatBufferingStart:
        {
            notifyListener(MEDIA_INFO, MEDIA_INFO_BUFFERING_START, 0);
            break;
        }

        case Source::kWhatBufferingEnd:
        {
            notifyListener(MEDIA_INFO, MEDIA_INFO_BUFFERING_END, 0);
            break;
        }

        case Source::kWhatSubtitleData:
        {
            sp<ABuffer> buffer;
            CHECK(msg->findBuffer("buffer", &buffer));

            sendSubtitleData(buffer, 0 /* baseIndex */);
            break;
        }

        case Source::kWhatTimedTextData:
        {
            int32_t generation;
            if (msg->findInt32("generation", &generation)
                    && generation != mTimedTextGeneration) {
                break;
            }

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

            sp<NuPlayerDriver> driver = mDriver.promote();
            if (driver == NULL) {
                break;
            }

            int posMs;
            int64_t timeUs, posUs;
            driver->getCurrentPosition(&posMs);
            posUs = posMs * 1000;
            CHECK(buffer->meta()->findInt64("timeUs", &timeUs));

            if (posUs < timeUs) {
                if (!msg->findInt32("generation", &generation)) {
                    msg->setInt32("generation", mTimedTextGeneration);
                }
                msg->post(timeUs - posUs);
            } else {
                sendTimedTextData(buffer);
            }
            break;
        }

        case Source::kWhatQueueDecoderShutdown:
        {
            int32_t audio, video;
            CHECK(msg->findInt32("audio", &audio));
            CHECK(msg->findInt32("video", &video));

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

            queueDecoderShutdown(audio, video, reply);
            break;
        }

        case Source::kWhatDrmNoLicense:
        {
            notifyListener(MEDIA_ERROR, MEDIA_ERROR_UNKNOWN, ERROR_DRM_NO_LICENSE);
            break;
        }

        default:
            TRESPASS();
    }
}

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

    switch (what) {
        case NuPlayer::CCDecoder::kWhatClosedCaptionData:
        {
            sp<ABuffer> buffer;
            CHECK(msg->findBuffer("buffer", &buffer));

            size_t inbandTracks = 0;
            if (mSource != NULL) {
                inbandTracks = mSource->getTrackCount();
            }

            sendSubtitleData(buffer, inbandTracks);
            break;
        }

        case NuPlayer::CCDecoder::kWhatTrackAdded:
        {
            notifyListener(MEDIA_INFO, MEDIA_INFO_METADATA_UPDATE, 0);

            break;
        }

        default:
            TRESPASS();
    }


}

void NuPlayer::sendSubtitleData(const sp<ABuffer> &buffer, int32_t baseIndex) {
    int32_t trackIndex;
    int64_t timeUs, durationUs;
    CHECK(buffer->meta()->findInt32("trackIndex", &trackIndex));
    CHECK(buffer->meta()->findInt64("timeUs", &timeUs));
    CHECK(buffer->meta()->findInt64("durationUs", &durationUs));

    Parcel in;
    in.writeInt32(trackIndex + baseIndex);
    in.writeInt64(timeUs);
    in.writeInt64(durationUs);
    in.writeInt32(buffer->size());
    in.writeInt32(buffer->size());
    in.write(buffer->data(), buffer->size());

    notifyListener(MEDIA_SUBTITLE_DATA, 0, 0, &in);
}

void NuPlayer::sendTimedTextData(const sp<ABuffer> &buffer) {
    const void *data;
    size_t size = 0;
    int64_t timeUs;
    int32_t flag = TextDescriptions::LOCAL_DESCRIPTIONS;

    AString mime;
    CHECK(buffer->meta()->findString("mime", &mime));
    CHECK(strcasecmp(mime.c_str(), MEDIA_MIMETYPE_TEXT_3GPP) == 0);

    data = buffer->data();
    size = buffer->size();

    Parcel parcel;
    if (size > 0) {
        CHECK(buffer->meta()->findInt64("timeUs", &timeUs));
        flag |= TextDescriptions::IN_BAND_TEXT_3GPP;
        TextDescriptions::getParcelOfDescriptions(
                (const uint8_t *)data, size, flag, timeUs / 1000, &parcel);
    }

    if ((parcel.dataSize() > 0)) {
        notifyListener(MEDIA_TIMED_TEXT, 0, 0, &parcel);
    } else {  // send an empty timed text
        notifyListener(MEDIA_TIMED_TEXT, 0, 0);
    }
}
////////////////////////////////////////////////////////////////////////////////

sp<AMessage> NuPlayer::Source::getFormat(bool audio) {
    sp<MetaData> meta = getFormatMeta(audio);

    if (meta == NULL) {
        return NULL;
    }

    sp<AMessage> msg = new AMessage;

    if(convertMetaDataToMessage(meta, &msg) == OK) {
        return msg;
    }
    return NULL;
}

void NuPlayer::Source::notifyFlagsChanged(uint32_t flags) {
    sp<AMessage> notify = dupNotify();
    notify->setInt32("what", kWhatFlagsChanged);
    notify->setInt32("flags", flags);
    notify->post();
}

void NuPlayer::Source::notifyVideoSizeChanged(const sp<AMessage> &format) {
    sp<AMessage> notify = dupNotify();
    notify->setInt32("what", kWhatVideoSizeChanged);
    notify->setMessage("format", format);
    notify->post();
}

void NuPlayer::Source::notifyPrepared(status_t err) {
    sp<AMessage> notify = dupNotify();
    notify->setInt32("what", kWhatPrepared);
    notify->setInt32("err", err);
    notify->post();
}

void NuPlayer::Source::onMessageReceived(const sp<AMessage> & /* msg */) {
    TRESPASS();
}

}  // namespace android