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I can't get all pixels values from my driver. plz help ;0(




Hi all.

After 3 weeks trying to solve my problem, I am about to give up and find another solution instead of trying to fix this one.
I have changed few things in the capture.c example available for download at http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/ and
the altered code can be seen here: http://pastebin.com/m7ef25480

So... what is the problem?

Well, I have set the following configuration for capture:

        fmt.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        fmt.fmt.pix.width       = 160;
        fmt.fmt.pix.height      = 120;
        fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB32;
        fmt.fmt.pix.field       = V4L2_FIELD_INTERLACED;

All the process is implemented in a function called process_image(void * p) where p is a void pointer to the buffer where the frames captures should be stored.

this is the function that reads the buffer:

if (-1 == read (fd, buffers[0].start, buffers[0].length))   (length = 160x120 -> 19200)

then after, I call the process_image function:
process_image (buffers[0].start);

What I need is read the buffer separation the R, G, B, A storing them in unsigned char variables. 

It should have 19.200 pixel (160x120) but instead, look what i have got:

[0]87 [0]110 [0]68 [0]134
[1]202 [1]73 [1]119 [1]109
[2]213 [2]36 [2]73 [2]33
.....
.....
[1287]73 [1287]100 [1287]150 [1287]133
[1288]69 [1288]133 [1288]4 [1288]0
[1289]0 [1289]0 [1289]0 [1289]0
[1290]0 [1290]0 [1290]0 [1290]0
[1291]0 [1291]0 [1291]0 [1291]0
.....
[4799]0 [4799]0 [4799]0 [4799]0
[0]80 [0]105 [0]145 [0]4
[1]146 [1]18 [1]108 [1]182
[2]68 [2]136 [2]137 [2]170

As you can see, I get only 1289 pixels with values and all the rest are 0; 
When the function is called again, the same happens over and over.

So... why am I getting only 1289 pixel with values when in fact it should be 160x120 pixel corresponding to 1 frame?
I am begging help 'cause my arsenal's over.. I am really out of ideas!

Thanks a lot!



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