[gstreamer-bugs] [Bug 571772] Possible issue with v4l2src and libv4l different way of ordering formats

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-good | Ver: 0.10.22




------- Comment #9 from Hans de Goede  2009-05-17 13:08 UTC -------
(In reply to comment #8)
> Why do we let libv4l* do any colourspace conversion at all again? Because
> ffmpegcolorspace doesn't handle bayer? Any other reasons?
> 
> 

Because there is nothing else which can handle:
V4L2_PIX_FMT_SN9C10X  v4l2_fourcc('S', '9', '1', '0') /* SN9C10x compression */
V4L2_PIX_FMT_SPCA501  v4l2_fourcc('S', '5', '0', '1') /* YUYV per line */  
V4L2_PIX_FMT_SPCA505  v4l2_fourcc('S', '5', '0', '5') /* YYUV per line */  
V4L2_PIX_FMT_SPCA508  v4l2_fourcc('S', '5', '0', '8') /* YUVY per line */  
V4L2_PIX_FMT_SPCA561  v4l2_fourcc('S', '5', '6', '1') /* compressed GBRG bayer 
V4L2_PIX_FMT_PAC207   v4l2_fourcc('P', '2', '0', '7') /* compressed BGGR bayer 
V4L2_PIX_FMT_MR97310A v4l2_fourcc('M', '3', '1', '0') /* compressed BGGR bayer 
V4L2_PIX_FMT_SQ905C   v4l2_fourcc('9', '0', '5', 'C') /* compressed RGGB bayer 
V4L2_PIX_FMT_PJPG     v4l2_fourcc('P', 'J', 'P', 'G') /* Pixart 73xx JPEG */   
V4L2_PIX_FMT_HM12     v4l2_fourcc('H', 'M', '1', '2') /*  8  YUV 4:2:0 16x16
mac
V4L2_PIX_FMT_SN9C20X_I420 v4l2_fourcc('S', '9', '2', '0') /* sn9c20xcompression

And indeed 4 variants of raw bayer too.

And as we add support for more video grabbing devices the list grows and grows,
so handling this in a single video4linux specific library and then making other
stuff use that, makes perfect sense. I agree we need to extend the API, so
that gstreamer can differentiate between real and emulated formats. And in
cases like this specific one can then prefer a real format over an emulated
one.


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