decoder return Dmai_EBITERROR, how to ignore it?

YJ Liu

Hi,guys:

I am using DM365+DVSDK4.0.

My H264 stream comes from network and other interface, not filesystem. there are some lost package when send to decoder.

the stream is sent as "29 P frames + 1 IDR frame" repeatly. each frame is cut to several slice. So when I package the stream to frame, some frame may not contain enough

slice as encoded. But I will make sure params "SPS/PPS" in IDR is complete.

Here is the problem:

when Vdec2_process() return DMAI_BITERROR, not buffers will be sent to displsy thread, I ignore it and get next frame.

But at the next time , I found BufTab_getFreeBuf() will not return the previous buffer. it seems the codec donot release the hDstBuf, so when this error happens again for about 31 times, BufTab_getFreeBuf() will return NULL. At this moment , not buffer will be available, the application is dead.

So ,have you guys meet this problem? how can I let the codec release the buffer/ or handle this error?

thank you.

over 12 years ago

0 YJ Liu over 12 years ago

Expert 1675 points

Here is the sample code based dvsdk decode program:

        ret = Vdec2_process(hVd2, hBufFromLoader, hDstBuf);
        if (ret < 0) {
            printf("Failed to decode video frame Vdec2_process()=%d\n", ret);
            cleanup(THREAD_FAILURE);
        }

       /* If no encoded data was used we cannot find the next frame*/
        if (ret == Dmai_EBITERROR && Buffer_getNumBytesUsed(hBufFromLoader) == 0){
            printf("Dmai_EBITERROR, Buffer_getNumBytesUsed()=0\r\n");
        }
        //gblIncVideoBytesProcessed(Buffer_getNumBytesUsed(hBufFromLoader));

        bufs_sent = handleCodecBufs(hVd2, envp->hDisplayInFifo);
        if (bufs_sent == 0){
            printf("send 0 frame to display,record(%d),get next<<--\n",++fail_send);
           //Buffer_freeUseMask(hDstBuf, CODEC_FREE | DISPLAY_FREE); // ???
            Loader_getVFramex(hLoader,0);
           continue;
        }

numDisplayBufs += bufs_sent;

.......

0 Marko Shink over 12 years ago in reply to YJ Liu

Genius 3475 points

Hi,

You can look at attached files, how i handled that some time ago.
Files are from DVSDK_4.01.00.09
Demos\Decode\video.c
dmai_2_20_00_14\packages\ti\sdo\dmai\ce\Vdec2.c (new function Vdec2_process_2)

Regards.

decode.zip

0 YJ Liu over 12 years ago in reply to Marko Shink

Expert 1675 points

Hi,Marko。

thanks for replying. I also read this thread: http://e2e.ti.com/support/embedded/linux/f/354/t/88083.aspx.

I will try your method and let you know the result ASAP.

0 YJ Liu over 12 years ago in reply to Marko Shink

Expert 1675 points

Hi,Marko:

Sorry for replying late.

I have try handleCodecErrBufs() and not work , When Dmai_EBITERROR happen , it will send about 10 frames to displayThread. there are some code I am not really understanding:

1、at First,hDisplayBufs[] will be set to NULL

for (i=0;i<IVIDDEC2_MAX_IO_BUFFERS;i++)
   {
       hVd->hDisplayBufs[i] = NULL;
   }
   hVd->displayBufIdx = 0;

2、then it will get display buffer and try to send to displayThread:

hOutBuf = Vdec2_getDisplayBuf(hVd2);

while (hOutBuf) {...}

So, why Vdec2_getDisplayBuf() will return NOT-NULL buffer while it has been set to NULL above? is it because the calling "VIDDEC2_control(hDecode, XDM_RESET, 0, &decStatus);"?

0 Marko Shink over 12 years ago in reply to YJ Liu

Genius 3475 points

Hi Liu,

Sorry, i forgot details, it's been a while since i've been working on that,
but i'm pretty sure it works well.
Make sure you are using "Vdec2.c" (DMAI) that i sent you,
and first rebuild dmai (make dmai_clean, make dmai), before building decode demo.

Regards.

decode9.zip

0 Marko Shink over 12 years ago in reply to Marko Shink

Genius 3475 points

... and make sure you are using new dmai function "Vdec2_process_2", before "handleCodecErrBufs".

0 YJ Liu over 12 years ago in reply to Marko Shink

Expert 1675 points

Hi,Marko:

thanks again for your kindness.

I did use vdec2_process_2 and handleCodecErrbufs, however ,I found sometimes the function cannot release the buffer held by codec,while sometimes can free. when BitError happen, the condition:

i = Buffer_getId(hFreeBuf);
       if (i == (freebufid-1))
           {

//=====//

}

maybe true, but sometimes it's not, hence the buffer cannot be free.

0 YJ Liu over 12 years ago in reply to Marko Shink

Expert 1675 points

Hi,Marko:

I have figured it out, thank you !

0 wei Sixday over 12 years ago in reply to YJ Liu

Prodigy 10 points

Hi，YJ Liu

I have Question about using XDM_RESET on DM368 H264 Decoder. can you give me ,your file about Vdec2.c and Demos\Decode\video.c .

email: weijingjing_yh@163.com thank you!

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decoder return Dmai_EBITERROR, how to ignore it?