Re: [pwc] Getting compressed image for external decompression

[Tim Braun <>]

Luc Saillard wrote:
> 
>>Also, does anyone know how high the compression factor of the built-in
>>algorithm is?
> 
>  
> Just play with resolution, and compression factor, and check your kernel log.
> I print the size of 4 lines. Just multiply by your number of lines and you
> have the size of the buffer.
> 
> Luc

Hi all,
I played around with capture.c a bit and determined the buffer sizes
used with various compression settings. In case someone is also
interested in this, here is what I found for my Philips PWC840:

Image Size      Compression     Bytes used
                Setting

160x120         YUV420P         28800
                0               28808
                1               18908
                2               18908
                3               18908

320x240         YUV420P         1152000
                0               76688
                1               76688
                2               44168
                3               28808

640x480         YUV420P         460800
                0               94568
                1               94568
                2               76808
                3               58568

cheers,
Tim
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