Re: [PATCH v3 3/9] DocBook/v4l: Add compressed video formats used on MT8173 codec driver
From: Wu-Cheng Li (æåè)
Date: Tue Jul 12 2016 - 04:16:45 EST
On Mon, Jul 11, 2016 at 10:56 AM, tiffany lin <tiffany.lin@xxxxxxxxxxxx> 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@xxxxxxxxxxxx>
>> > ---
>> > 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)?
> It can be as input format for encoder, MDP and display drivers in our
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
> This private format is only available in our platform.
> So I put it in "Reserved Format Identifiers" sections.
> best regards,
>> > + </row>
>> > </tbody>
>> > </tgroup>
>> > </table>
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