Query on SDI Video Capture using Davinci DM6467

Balaji Sivakumar

Intellectual 320 points

Other Parts Discussed in Thread: TVP7002

Hi ,

Hope you doing well. I have query on SDI Video capture using our Davinci DM6467 processor.

H/W Setup :

Our setup looks same like below,

Davinci DM6467

(VPIF Bus )

SDI Receiver GS2970

SDI Receiver Digital Output

RGB Parameters

CLK

S/W Details: Application to calculate RGB --------------à RX_v4l2.C-------------àDavinciHD_capture.C

Am trying to capture the video using video device /dev/video0 and using VIDIOC_G_INPUT or VIDIOC_S_INPUT to capture the data but am getting error as resource is not temporarily available while de-queues a captured buffer from driver.

But am able to probe the data’s and clock in the H/W. I have also attached the log while doing this test and also the function we use fro testing RGB Function.

Please request your help on this issue. As this activity being long time pending for us.

Note : We have followed the same procedure for capturing the component video using TVP7002 , instead of tvp7002 we use Rx_V4l2 driver for sdi receiver.

- Balaji s

over 14 years ago

0 Nagabhushana over 14 years ago

TI__Expert 4685 points

can you provide the log please?

0 Brijesh Jadav80 over 14 years ago in reply to Nagabhushana

TI__Expert 3925 points

Hi,

If you written driver for the SDI device same as the TVP7002, make sure that it is connected to VPIF capture over 16bit embedded sync interface. If you want to use discrete sync interface, you will need to connect 8/10 bits of your data and other sync signals.

Thanks,

Brijesh Jadav

0 Balaji Sivakumar over 14 years ago in reply to Brijesh Jadav80

Intellectual 320 points

Hi ,

Thanks for your reply, it is connected to the VPIF capture over 16 bit interface only.

I have also attched the log captured while testing SDI Video Capture.

Thanks,

Balaji S

7558.SDI_Video_Capture_Log.txt

0 Balaji Sivakumar over 14 years ago in reply to Balaji Sivakumar

Intellectual 320 points

Hi,

can anyone provide your suggestion??

Thanks,

Balaji S

0 Brijesh Jadav80 over 14 years ago in reply to Balaji Sivakumar

TI__Expert 3925 points

Hi Balaji,

From the log, it looks like it returns from the waiton function. This error returns only one error code -11. This code tells application to try it out again. It looks like you have opened the driver in non-blocking mode. Can you please check if it is the case? If it is, either you can open the driver in blocking mode or ignore -EAGAIN error code and try again until it returns success.

Thanks,

Brijesh Jadav

0 Balaji Sivakumar over 14 years ago in reply to Brijesh Jadav80

Intellectual 320 points

HI Brijesh,

Yes am opening the driver in the non blocking mode. I have ignored EAGIN the error after that am facing issue while de-queuing the buffer using VIDIOC_DQBUF ioctl in that function I should the buffer state value as 4 for STATE_DONE but am getting the buffer state value as 3 i forced the value to 4, after that am able to capture the video data but its not valid data.

Do you any idea why the buffer state is reading as 3, I tried to open the driver in blocking mode but it stuck at one point, attached the log .

Request your suggestions and ideas.

Thanks,

Balaji S

0160.sdi_video_log.txt

0 Brijesh Jadav80 over 14 years ago in reply to Balaji Sivakumar

TI__Expert 3925 points

Hi,

I am not sure why it is set to STATE_ACTIVE(3), It should be either STATE_DONE(4) or STATE_IDLE(6). I am marking it correctly in the ISR to DONE if it is completed. Which input source are you using? Can you check fps/vsyn/hsync are correct in your decoder?

Thanks,

Brijesh Jadav

0 Balaji Sivakumar over 14 years ago in reply to Brijesh Jadav80

Intellectual 320 points

HI Brijesh,

Thanks for the details.

We are providing the SDI input frpm Phabrix equipment and input resoultion is 720p1280 to the SDI Receiver Gennum GS2970, am able to see the clock and data's at the decoder side.

Thanks,

Balaji S

0 Brijesh Jadav80 over 14 years ago in reply to Balaji Sivakumar

TI__Expert 3925 points

Hi,

Can you see your fps is coming out correctly by looking into number of interrupts in /proc/interrupts?

Thx,

Brijesh Jadav

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Query on SDI Video Capture using Davinci DM6467