Dra7xx EVM - Video capture use case sequence

K_Raj

Hello All,

I am trying to understand the VIP/VPE application use case implementation provided in the GLSDK 6.04 onwards.

the developers guide link provides how to run the application dmabuftest & vpecapturedisplay , I don't have any information like how its handled within DRA7xx SOC .

http://downloads.ti.com/dsps/dsps_public_sw/glsdk/latest/exports/DRA7xx_GLSDK_Software_Developers_Guide.html#Running_VIP.2FVPE_application

Does it capture video frame using IPU (M4 ) Core and then display it through the SGX (omap drm pvr ) driver through A15 ? How does the IPC cross core communication implemented ?

I do observe that when the firmware dsp & ipu is not present in rootfs/lib/firmware ,it fails to load in the kernel startup and when i run the sample vip/vpe application it still able to capture video and display on the LCD.

Could anyone explain the DRA7xx SOC VIP/VPE video capture sequence ?

Thanks,

Kanagarajan

over 9 years ago

0 Boyko Kazakov over 9 years ago

TI__Genius 10965 points

Hi Kanagarajan,
Familiarize yourself with the vip/vpe drivers processors.wiki.ti.com/.../GLSDK_VIP_driver . You can see example for display directly on the dma. I will provide you with more extensive explanation later today.
Regards,
Boyko

0 K_Raj over 9 years ago in reply to Boyko Kazakov

Prodigy 190 points

Hi Boyko,

Yes , I understand now , both video capture / display handled in A15 core , the pre-compiled dsp/ipu firmware seems to be used for audio dsp application demos.

I need to write a sample application to capture the video frames and write to a file or buffer and then later need to verify by playing the captured raw video.

Please share if you have any additional details.

Thanks,
Kanagarajan

0 Nikhil Devshatwar over 9 years ago in reply to K_Raj

TI__Genius 9905 points

Hi Kanagarajan,

The driver is v4l2 standard complicant and any generic code based on V4L2 framework should work
You can refer to the v4l2capturedisplay application and modify it to write to a file
You can find the app source code here git.ti.com/.../v4l2capturedisplay.c

Entire driver and application runs only on A15

0 K_Raj over 9 years ago in reply to Nikhil Devshatwar

Prodigy 190 points

Hi Nikhil,

Thanks for the details , this sample application is good to start with video frame capture.

Thanks,

Kanagarajan

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Dra7xx EVM - Video capture use case sequence