v4l2 display driver test Application

ramakrishna deshpande

Intellectual 560 points

Hi,

Where can I get v4l2 display driver test Application.

Where can I get all structs related to v4l2 display.

Is VIDIOC_STREAMON ioctl common for normal media file playback and video streaming..?

I am writing test application for V4L2 display driver and I have followed the ioctl sequences as bellow is that correct

open /dev/video1

fopen for video file reading

ioctl V4L2_MEMORY_MMAP

ioctl VIDIOC_QUERYBUF

ioctl VIDIOC_STREAMON

while(1){

VIDIOC_QUERYBUF

VIDIOC_DQBUF

}

with regards,

Ramakrishna

over 14 years ago

0 markus.hofstaetter over 13 years ago

Intellectual 935 points

Hi Ramakrishna,

the procedure is basically the same as you posted:

open video device
open other stuff

configure video device (check capabilities, set format etc)
request buffers (for example kernel space buffers)
query buffers
mmap them

fill buffers initially
queue them initially

streamon

while(1) {

dequeue
fillwithimage
queue

}

Using the VPSS v4l2 as playback:

VPSS driver, usage, v4l2/fb interfaces and example flow

You'll find the current supported IOCTLs there, including some explanation.
The examples can be found in the PSP or EZSDK with source code.

How to capture:

V4L2 Capute example:

Official V4L2 specification
Official v4l2 capture example

Capturing and playback is essentially the same after initialization, except you processing/fill function.

Regards Markus

0 HardikShah over 13 years ago in reply to markus.hofstaetter

TI__Mastermind 20245 points

Hi,

V4L2 display examples sources are packaged with the PSP release. You can modify that and test your scenarios. Examples are under TI816X-LINUX-PSP-04.00.01.13\src\examples\examples.tar.gz

Regards,

Hardik Shah

Processors

Processors forum

v4l2 display driver test Application