HI Stephan,
Thanks for the patch, and sorry for the late reply.
On Friday 28 January 2011 20:38:58 Stephan Lachowsky wrote:
> Associate the H.264 GUID with an H.264 pixel format so that frame
> and stream based format descriptors with this GUID are recognized
> by the UVC video driver.
> ---
> drivers/media/video/uvc/uvc_driver.c | 5 +++++
> drivers/media/video/uvc/uvcvideo.h | 3 +++
> include/linux/videodev2.h | 1 +
> 3 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/media/video/uvc/uvc_driver.c
> b/drivers/media/video/uvc/uvc_driver.c index 6bcb9e1..a5a86ce 100644
> --- a/drivers/media/video/uvc/uvc_driver.c
> +++ b/drivers/media/video/uvc/uvc_driver.c
> @@ -108,6 +108,11 @@ static struct uvc_format_desc uvc_fmts[] = {
> .guid = UVC_GUID_FORMAT_MPEG,
> .fcc = V4L2_PIX_FMT_MPEG,
> },
> + {
> + .name = "H.264",
> + .guid = UVC_GUID_FORMAT_H264,
> + .fcc = V4L2_PIX_FMT_H264,
> + },
> };
>
> /*
> ------------------------------------------------------------------------
> diff --git a/drivers/media/video/uvc/uvcvideo.h
> b/drivers/media/video/uvc/uvcvideo.h index e522f99..4f65ac6 100644
> --- a/drivers/media/video/uvc/uvcvideo.h
> +++ b/drivers/media/video/uvc/uvcvideo.h
> @@ -155,6 +155,9 @@ struct uvc_xu_control {
> #define UVC_GUID_FORMAT_MPEG \
> { 'M', 'P', 'E', 'G', 0x00, 0x00, 0x10, 0x00, \
> 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
> +#define UVC_GUID_FORMAT_H264 \
> + { 'H', '2', '6', '4', 0x00, 0x00, 0x10, 0x00, \
> + 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
>
> /*
> ------------------------------------------------------------------------ *
> Driver specific constants.
> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
> index 5f6f470..d3b5877 100644
> --- a/include/linux/videodev2.h
> +++ b/include/linux/videodev2.h
> @@ -341,6 +341,7 @@ struct v4l2_pix_format {
> #define V4L2_PIX_FMT_JPEG v4l2_fourcc('J', 'P', 'E', 'G') /* JFIF JPEG
> */ #define V4L2_PIX_FMT_DV v4l2_fourcc('d', 'v', 's', 'd') /*
> 1394 */ #define V4L2_PIX_FMT_MPEG v4l2_fourcc('M', 'P', 'E',
> 'G') /* MPEG-1/2/4 */ +#define V4L2_PIX_FMT_H264 v4l2_fourcc('H',
> '2', '6', '4') /* H.264 Annex-B NAL Units */
I've discussed H.264 support with Hans Verkuil (CC'ed) some time ago, and his
opinion was that we shouldn't use a new V4L2 format for it. H.264 is
essentially an MPEG version, so drivers should use V4L2_PIX_FMT_MPEG and
select the details using the MPEG CIDs.
Of course feel free to disagree with Hans and discuss the matter with him :-)
> /* Vendor-specific formats */
> #define V4L2_PIX_FMT_CPIA1 v4l2_fourcc('C', 'P', 'I', 'A') /* cpia1 YUV
> */
--
Regards,
Laurent Pinchart
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