How to optimal yuv frame to skype local preview latency?

Hello,

What is the software release that you are using here?

BR
Margarita

Hi,

We are using IPNC RDK 3.8.

BR
Jacson

Hello,

I will notify the IPNC team for help.

BR
Margarita

Hi Margarita,

Thanks for your help.

BR
Jacson

Hi
The sclr link latency is about 6~10msec. I also try usecase "camera->display", the glass to glass latency is about 60msec, so the camera seems not occupy more time. The yuv data size is 640x360x2x30x8 bps. Is it my bottleneck? I find the data size effect latency very much. How can I improve this latency?

Thanks,
Jacson

Hi TI expert,

Do you have any idea?

Thanks,
Jacson

Hi,

 

You can roughly find out the frame latency in the system by adding the following code in the ..\ipnc_rdk\ipnc_mcfw\mcfw\src_bios6\links_common\ipcFramesOut\ipcFramesOutLink_tsk.c file:

 

Int32 IpcFramesOutLink_processFrameBufs(IpcFramesOutLink_Obj * pObj)
{
    System_LinkInQueParams *pInQueParams;
    FVID2_FrameList bufList;
    FVID2_Frame *pFrameBuf = NULL;
    SystemIpcFrames_ListElem *pListElem;
    Int32 status;
    Int32 bufId;
    UInt32 curTime;
    FVID2_FrameList freeFrameBufList;
    UInt8 queId;
    UInt32 sendMsgToTsk = 0;
    UInt32 chPerQueue;
    IpcFramesOutLink_ChObj *pChObj;
 UInt32 frameLatency;

    pInQueParams = &pObj->createArgs.baseCreateParams.inQueParams;

    bufList.numFrames = 0;
    System_getLinksFullFrames(pInQueParams->prevLinkId,
                            pInQueParams->prevLinkQueId, &bufList);

    freeFrameBufList.numFrames = 0;
    curTime = Utils_getCurTimeInMsec();
    if (bufList.numFrames)
    {
#ifdef SYSTEM_DEBUG_IPC_RT
        Vps_printf(" %d: IPC_FRAMES_OUT   : Received %d framebufs !!!\n",
                   Utils_getCurTimeInMsec(), bufList.numFrames);
#endif

        UTILS_assert(bufList.numFrames <= FVID2_MAX_FVID_FRAME_PTR);
        pObj->stats.recvCount += bufList.numFrames;
        sendMsgToTsk = 0;
        chPerQueue =
            (pObj->numCh / pObj->createArgs.baseCreateParams.numOutQue);

#ifdef IPC_FRAMES_IN_ENABLE_PROFILE
        Utils_prfTsBegin(pObj->stats.tsHandle);
#endif                                                     /* IPC_FRAMES_IN_ENABLE_PROFILE
                                                            */
        pObj->totalFrameCount += bufList.numFrames;
        for (bufId = 0; bufId < bufList.numFrames; bufId++)
        {
            Bool          doFrameDrop;

            pFrameBuf = bufList.frames[bufId];
            UTILS_assert(pFrameBuf != NULL);

   frameLatency = Utils_getCurTimeInMsec() - pFrameBuf->timeStamp;
   Vps_printf("#### Frame Latency = %d msec\n",frameLatency);

.

.

.

 

regards,

Anand

Hi Anand,

Thanks your reply, but I know this method to measure the latency from camera link dequeue frame to next links. The sclr link process latency is around 6~10msec. My link is "camera->sclr->ipcFrameoutVpsstoHost->ipcFrameInHost", the both link ipcFrameoutVpsstoHost and ipcFrameInHost should not take much more latency, and the glass to glass latency of usecase "camera->display" is also about 60msec, so if we estimate the driver to camera 45msec, which stage possible can optimal the latency? How to do it?

Thanks a lot.

Jacson