Merge "aaudio: minor cleanup in clock model" into rvc-dev am: ef0ade40

        , mMarkerNanoTime(0)

        , mSampleRate(48000)

        , mFramesPerBurst(48)

        , mBurstPeriodNanos(0) // this will be updated before use

        , mMaxMeasuredLatenessNanos(0)

        , mLatenessForDriftNanos(kInitialLatenessForDriftNanos)

        , mState(STATE_STOPPED)

    }

}

IsochronousClockModel::~IsochronousClockModel() {

}

void IsochronousClockModel::setPositionAndTime(int64_t framePosition, int64_t nanoTime) {

    ALOGV("setPositionAndTime, %lld, %lld", (long long) framePosition, (long long) nanoTime);

    mMarkerFramePosition = framePosition;

            // Calculate upper region that will trigger a drift forwards.

            mLatenessForDriftNanos = mMaxMeasuredLatenessNanos - (mMaxMeasuredLatenessNanos >> 4);

        } else { // decrease

            // If these is an outlier in lateness then mMaxMeasuredLatenessNanos can go high

            // If this is an outlier in lateness then mMaxMeasuredLatenessNanos can go high

            // and stay there. So we slowly reduce mMaxMeasuredLatenessNanos for better

            // long term stability. The two opposing forces will keep mMaxMeasuredLatenessNanos

            // within a reasonable range.

public:

    IsochronousClockModel();

    virtual ~IsochronousClockModel();

    virtual ~IsochronousClockModel() = default;

    void start(int64_t nanoTime);

    void stop(int64_t nanoTime);

private:

    int32_t getLateTimeOffsetNanos() const;

    void update();

    enum clock_model_state_t {

        STATE_STOPPED,

    // distribution of timestamps relative to earliest

    std::unique_ptr<android::audio_utils::Histogram>   mHistogramMicros;

    void update();

};

} /* namespace aaudio */