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Commit 3560d53f authored by TreeHugger Robot's avatar TreeHugger Robot Committed by Android (Google) Code Review
Browse files

Merge "Camera: Reduce latency for dejittering" into tm-qpr-dev

parents 2170f74c 35bd3553

services/camera/libcameraservice/device3/Camera3OutputStream.cpp

+10 −4
Original line number Diff line number Diff line
@@ -1410,18 +1410,24 @@ void Camera3OutputStream::returnPrefetchedBuffersLocked() { 
}



nsecs_t Camera3OutputStream::syncTimestampToDisplayLocked(nsecs_t t) {

    nsecs_t currentTime = systemTime();

    if (!mFixedFps) {

        mLastCaptureTime = t;

        mLastPresentTime = currentTime;

        return t;

    }



    ParcelableVsyncEventData parcelableVsyncEventData;

    auto res = mDisplayEventReceiver.getLatestVsyncEventData(&parcelableVsyncEventData);

    if (res != OK) {

        ALOGE("%s: Stream %d: Error getting latest vsync event data: %s (%d)",

                __FUNCTION__, mId, strerror(-res), res);

        mLastCaptureTime = t;

        mLastPresentTime = t;

        mLastPresentTime = currentTime;

        return t;

    }



    const VsyncEventData& vsyncEventData = parcelableVsyncEventData.vsync;

    nsecs_t currentTime = systemTime();

    nsecs_t minPresentT = mLastPresentTime + vsyncEventData.frameInterval / 2;



    // Find the best presentation time without worrying about previous frame's
@@ -1526,8 +1532,8 @@ nsecs_t Camera3OutputStream::syncTimestampToDisplayLocked(nsecs_t t) { 
        }

    }



    if (expectedPresentT == mLastPresentTime && expectedPresentT <=

            vsyncEventData.frameTimelines[maxTimelines].expectedPresentationTime) {

    if (expectedPresentT == mLastPresentTime && expectedPresentT <

            vsyncEventData.frameTimelines[maxTimelines-1].expectedPresentationTime) {

        // Couldn't find a reasonable presentation time. Using last frame's

        // presentation time would cause a frame drop. The best option now

        // is to use the next VSync as long as the last presentation time

services/camera/libcameraservice/device3/Camera3OutputStream.h

+1 −1
Original line number Diff line number Diff line
@@ -432,7 +432,7 @@ class Camera3OutputStream : 
    static constexpr nsecs_t kSpacingResetIntervalNs = 50000000LL; // 50 millisecond

    static constexpr nsecs_t kTimelineThresholdNs = 1000000LL; // 1 millisecond

    static constexpr float kMaxIntervalRatioDeviation = 0.05f;

    static constexpr int kMaxTimelines = 3;

    static constexpr int kMaxTimelines = 2;

    nsecs_t syncTimestampToDisplayLocked(nsecs_t t);



    // Re-space frames by delaying queueBuffer so that frame delivery has

services/camera/libcameraservice/device3/PreviewFrameSpacer.cpp

+1 −1
Original line number Diff line number Diff line
@@ -68,7 +68,7 @@ bool PreviewFrameSpacer::threadLoop() { 
        return true;

    }



    // Cache the frame to match readout time interval, for up to 33ms

    // Cache the frame to match readout time interval, for up to kMaxFrameWaitTime

    nsecs_t expectedQueueTime = mLastCameraPresentTime + readoutInterval;

    nsecs_t frameWaitTime = std::min(kMaxFrameWaitTime, expectedQueueTime - currentTime);

    if (frameWaitTime > 0 && mPendingBuffers.size() < 2) {

services/camera/libcameraservice/device3/PreviewFrameSpacer.h

+1 −1
Original line number Diff line number Diff line
@@ -85,7 +85,7 @@ class PreviewFrameSpacer : public Thread { 
    nsecs_t mLastCameraPresentTime = 0;

    static constexpr nsecs_t kWaitDuration = 5000000LL; // 50ms

    static constexpr nsecs_t kFrameIntervalThreshold = 80000000LL; // 80ms

    static constexpr nsecs_t kMaxFrameWaitTime = 33333333LL; // 33ms

    static constexpr nsecs_t kMaxFrameWaitTime = 10000000LL; // 10ms

};



}; //namespace camera3