On Monday, January 17, 2011 04:44:54 Jonghun Han wrote: > > Hello, > > How to set global alpha to V4L2_BUF_TYPE_CAPTURE ? > > Samsung SoC S5PC210 has Camera interface and Video post processor named FIMC > which can set the alpha value to V4L2_BUF_TYPE_CAPTURE. > For example during color space conversion from YUV422 to ARGB8888, > FIMC can set the alpha value to V4L2_BUF_TYPE_CAPTURE. > > I tried to find an available command to set it but I couldn't found it. That's right, there isn't. > But there is fmt.win.global_alpha for Video Overlay Interface. > So in my opinion VIDIOC_S_FMT is also suitable for V4L2_BUF_TYPE_CAPTURE*. > How about using fmt.pix.priv in struct v4l2_format > and fmt.pix_mp.reserved[0] in struct v4l2_format ? Not a good idea. This is really ideal for a control. We already have a somewhat similar control in the form of V4L2_CID_BG_COLOR. It's perfectly reasonable to add a V4L2_CID_ALPHA_COLOR (or something similar) where you set this up. The little available space in the format structs is too precious to use for something trivial like this :-) Regards, Hans -- Hans Verkuil - video4linux developer - sponsored by Cisco -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
