Merge "Do not pre-fill OutputTrack buffer for duplicating thread"

    uint32_t waitTimeLeftMs = mSourceThread->waitTimeMs();

    if (!mActive && frames != 0) {

        start();

        sp<ThreadBase> thread = mThread.promote();

        if (thread != 0) {

            MixerThread *mixerThread = (MixerThread *)thread.get();

            if (mFrameCount > frames) {

                // For the first write after being inactive, ensure that we have

                // enough frames to fill mFrameCount (which should be multiples of

                // the minimum buffer requirements of the downstream MixerThread).

                // This provides enough frames for the downstream mixer to begin

                // (see AudioFlinger::PlaybackThread::Track::isReady()).

                if (mBufferQueue.size() < kMaxOverFlowBuffers) {

                    uint32_t startFrames = (mFrameCount - frames);

                    pInBuffer = new Buffer;

                    pInBuffer->mBuffer = calloc(1, startFrames * mFrameSize);

                    pInBuffer->frameCount = startFrames;

                    pInBuffer->raw = pInBuffer->mBuffer;

                    mBufferQueue.add(pInBuffer);

                } else {

                    ALOGW("OutputTrack::write() %p no more buffers in queue", this);

                }

            }

        }

        (void) start();

    }

    while (waitTimeLeftMs) {