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    SubjectRe: [PATCH v3 3/9] DocBook/v4l: Add compressed video formats used on MT8173 codec driver
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    On Tue, 2016-07-12 at 16:16 +0800, Wu-Cheng Li (李務誠) wrote:
    > On Mon, Jul 11, 2016 at 10:56 AM, tiffany lin <tiffany.lin@mediatek.com> wrote:
    > > Hi Hans,
    > >
    > > On Fri, 2016-07-08 at 12:23 +0200, Hans Verkuil wrote:
    > >> On 05/30/2016 02:29 PM, Tiffany Lin wrote:
    > >> > Add V4L2_PIX_FMT_MT21 documentation
    > >> >
    > >> > Signed-off-by: Tiffany Lin <tiffany.lin@mediatek.com>
    > >> > ---
    > >> > Documentation/DocBook/media/v4l/pixfmt.xml | 6 ++++++
    > >> > 1 file changed, 6 insertions(+)
    > >> >
    > >> > diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
    > >> > index 5a08aee..d40e0ce 100644
    > >> > --- a/Documentation/DocBook/media/v4l/pixfmt.xml
    > >> > +++ b/Documentation/DocBook/media/v4l/pixfmt.xml
    > >> > @@ -1980,6 +1980,12 @@ array. Anything what's in between the UYVY lines is JPEG data and should be
    > >> > concatenated to form the JPEG stream. </para>
    > >> > </entry>
    > >> > </row>
    > >> > + <row id="V4L2_PIX_FMT_MT21">
    > >> > + <entry><constant>V4L2_PIX_FMT_MT21</constant></entry>
    > >> > + <entry>'MT21'</entry>
    > >> > + <entry>Compressed two-planar YVU420 format used by Mediatek MT8173
    > >> > + codec driver.</entry>
    > >>
    > >> Can you give a few more details? The encoder driver doesn't seem to produce this
    > >> format, so who is creating this? Where is this format documented?
    > Decoder hardware produces MT21 (compressed). Image processor can
    > convert it to a format that can be input of display driver. Tiffany.
    > When do you plan to upstream image processor (mtk-mdp)?
    > >
    We are working on this. Will upstream soon.

    > > It can be as input format for encoder, MDP and display drivers in our
    > > platform.
    > I remember display driver can only accept uncompressed MT21. Right?
    > Basically V4L2_PIX_FMT_MT21 is compressed and is like an opaque
    > format. It's not usable until it's decompressed and converted by image
    > processor.
    That's right in MT8173 platform.

    best regards,
    Tiffany
    > > This private format is only available in our platform.
    > > So I put it in "Reserved Format Identifiers" sections.
    > >
    > >
    > > best regards,
    > > Tiffany
    > >
    > >> Regards,
    > >>
    > >> Hans
    > >>
    > >> > + </row>
    > >> > </tbody>
    > >> > </tgroup>
    > >> > </table>
    > >> >
    > >
    > >
    > > --
    > > To unsubscribe from this list: send the line "unsubscribe linux-media" in
    > > the body of a message to majordomo@vger.kernel.org
    > > More majordomo info at http://vger.kernel.org/majordomo-info.html


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