Merge "SoundPool: Do not sleep on stop for USAGE_GAME or on BUFFER_END" into qt-qpr1-dev

        ALOGV("process %p channel %d event %s",

              this, mChannelID, (event == AudioTrack::EVENT_UNDERRUN) ? "UNDERRUN" :

                      "BUFFER_END");

        // Only BUFFER_END should happen as we use static tracks.

        setVolume_l(0.f, 0.f);  // set volume to 0 to indicate no need to ramp volume down.

        mSoundPool->addToStopList(this);

    } else if (event == AudioTrack::EVENT_LOOP_END) {

        ALOGV("End loop %p channel %d", this, mChannelID);

bool SoundChannel::doStop_l()

{

    if (mState != IDLE) {

        setVolume_l(0, 0);

        ALOGV("stop");

        if (mLeftVolume != 0.f || mRightVolume != 0.f) {

            setVolume_l(0.f, 0.f);

            if (mSoundPool->attributes()->usage != AUDIO_USAGE_GAME) {

                // Since we're forcibly halting the previously playing content,

                // we sleep here to ensure the volume is ramped down before we stop the track.

                // Ideally the sleep time is the mixer period, or an approximation thereof

                // (Fast vs Normal tracks are different).

        // TODO: consider pausing instead of stop here.

                ALOGV("sleeping: ChannelID:%d  SampleID:%d", mChannelID, mSample->sampleID());

                std::this_thread::sleep_for(std::chrono::milliseconds(20));

            }

        }

        mAudioTrack->stop();

        mPrevSampleID = mSample->sampleID();

        mSample.clear();