Hey Luca,
On Thu, 2003-02-13 at 13:55, Luca wrote:
> >> 2) The frames are grabbed using the YUV422-16bit format (original
> video),
> >> but when xawtv try to display them, the colours vary from green to
> >> purple only (i am not an expert, but i think the u or v value
> >> is setted to 0).
>
> >bytes swapped?
>
> No, it doesn't sound like bytes are swapped..
The zoran driver had byteswappings too (on YUV-4:2:2), which gave
exactly the same result - YUYV became UYVY and the picture, when
displayed as YUYV, was... green and purple! So I'd say it does...
This is easy to check (ugly - but hey, it's for testing ;) ):
static inline void
swap_bytes (uint8_t *buffer,
int length)
{
uint16_t *words = (uint16_t *) buffer;
while (length >= 2) {
*words = ((*words >> 8) & 0xff) | ((*words & 0xff) << 8);
words++; length -= 2;
}
}
Something like this. Feel free to try it out.
Ronald
--
Ronald Bultje <rbultje@xxxxxxxxxxxxxxxxxxx>
Linux Video/Multimedia developer
