Any comments? On Tue, Sep 14, 2010 at 11:29 PM, Kamil Debski <k.debski@xxxxxxxxxxx> wrote: > Hello, > > Mem2mem devices currently use V4L2_CAP_VIDEO_CAPTURE and V4L2_CAP_VIDEO_OUTPUT capabilities. One might expect that a capture device is a camera and an output device can display images. If I remember correct our discussion during the Helsinki v4l2 summit, Hans de Goede has pointed that such devices are listed in applications and can confuse users. The user expects a camera and he has to choose from a long list of devices. > > The solution to this would be the introduction of two new capability V4L2_CAP_VIDEO_M2M. Such devices would not be listed when user is expected to choose which webcam or TV tuner device to use. > > Another thing about m2m devices is the naming of buffers: V4L2_BUF_TYPE_VIDEO_CAPTURE means the destination buffer and V4L2_BUF_TYPE_VIDEO_OUTPUT means source. This indeed is confusing, so I think the introduction of two new buffer types is justified. I would recommend V4L2_BUF_TYPE_M2M_SOURCE and V4L2_BUF_TYPE_M2M_DESTINATION to clearly state what is the buffer's purpose. > > I would be grateful for your comments to this RFC. > > Best wishes, > -- > Kamil Debski > Linux Platform Group > Samsung Poland R&D Center > > -- > 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 > -- 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
