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Message-ID: <752c2573-97bc-4b5a-87d1-ca52b854a48d@foss.st.com>
Date: Thu, 21 Nov 2024 10:59:37 +0100
From: Hugues FRUCHET <hugues.fruchet@...s.st.com>
To: Nicolas Dufresne <nicolas.dufresne@...labora.com>,
Mauro Carvalho Chehab
<mchehab@...nel.org>,
Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
Philipp Zabel <p.zabel@...gutronix.de>,
Hans Verkuil
<hverkuil-cisco@...all.nl>,
Fritz Koenig <frkoenig@...omium.org>,
Sebastian
Fricke <sebastian.fricke@...labora.com>,
Daniel Almeida
<daniel.almeida@...labora.com>,
Andrzej Pietrasiewicz
<andrzej.p@...labora.com>,
Benjamin Gaignard
<benjamin.gaignard@...labora.com>,
<linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-rockchip@...ts.infradead.org>,
<linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH v2 1/3] media: uapi: add WebP uAPI
Hi Nicolas,
thanks for review,
On 11/20/24 15:21, Nicolas Dufresne wrote:
> Hi Hughe,
>
> thanks for the update.
>
> Le mercredi 20 novembre 2024 à 12:01 +0100, Hugues Fruchet a écrit :
>> This patch adds the WebP picture decoding kernel uAPI.
>>
>> This design is based on currently available VP8 API implementation and
>> aims to support the development of WebP stateless video codecs
>> on Linux.
>>
>> Signed-off-by: Hugues Fruchet <hugues.fruchet@...s.st.com>
>> ---
>> Documentation/userspace-api/media/v4l/biblio.rst | 9 +++++++++
>> .../userspace-api/media/v4l/pixfmt-compressed.rst | 15 +++++++++++++++
>> drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
>> include/uapi/linux/videodev2.h | 1 +
>> 4 files changed, 26 insertions(+)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/biblio.rst b/Documentation/userspace-api/media/v4l/biblio.rst
>> index 35674eeae20d..df3e963fc54f 100644
>> --- a/Documentation/userspace-api/media/v4l/biblio.rst
>> +++ b/Documentation/userspace-api/media/v4l/biblio.rst
>> @@ -447,3 +447,12 @@ AV1
>> :title: AV1 Bitstream & Decoding Process Specification
>>
>> :author: Peter de Rivaz, Argon Design Ltd, Jack Haughton, Argon Design Ltd
>> +
>> +.. _webp:
>> +
>> +WEBP
>> +====
>> +
>> +:title: WEBP picture Bitstream & Decoding Process Specification
>> +
>> +:author: Google (https://developers.google.com/speed/webp)
>> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> index 806ed73ac474..e664e70b0619 100644
>> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> @@ -169,6 +169,21 @@ Compressed Formats
>> this pixel format. The output buffer must contain the appropriate number
>> of macroblocks to decode a full corresponding frame to the matching
>> capture buffer.
>> + * .. _V4L2-PIX-FMT-WEBP-FRAME:
>> +
>> + - ``V4L2_PIX_FMT_WEBP_FRAME``
>> + - 'WEBP'
>> + - WEBP VP8 parsed frame, excluding WEBP RIFF header, keeping only the VP8
>> + bistream including the frame header, as extracted from the container.
>> + This format is adapted for stateless video decoders that implement a
>> + WEBP pipeline with the :ref:`stateless_decoder`.
>> + Metadata associated with the frame to decode is required to be passed
>> + through the ``V4L2_CID_STATELESS_VP8_FRAME`` control.
>> + See the :ref:`associated Codec Control IDs <v4l2-codec-stateless-vp8>`.
>> + Exactly one output and one capture buffer must be provided for use with
>> + this pixel format. The output buffer must contain the appropriate number
>> + of macroblocks to decode a full corresponding frame to the matching
>> + capture buffer.
>
> I wonder if we should document the constraints, I think
> V4L2_VP8_FRAME_FLAG_KEY_FRAME must be set, which imply that last/golden/alt
> timestamp are ignored.
I will add something about that.
>
> With that clarified:
>
> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
>
>>
>>
>> * .. _V4L2-PIX-FMT-VP9:
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
>> index 0304daa8471d..e2ff03d0d773 100644
>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>> @@ -1501,6 +1501,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>> case V4L2_PIX_FMT_VC1_ANNEX_L: descr = "VC-1 (SMPTE 412M Annex L)"; break;
>> case V4L2_PIX_FMT_VP8: descr = "VP8"; break;
>> case V4L2_PIX_FMT_VP8_FRAME: descr = "VP8 Frame"; break;
>> + case V4L2_PIX_FMT_WEBP_FRAME: descr = "WEBP VP8 Frame"; break;
>> case V4L2_PIX_FMT_VP9: descr = "VP9"; break;
>> case V4L2_PIX_FMT_VP9_FRAME: descr = "VP9 Frame"; break;
>> case V4L2_PIX_FMT_HEVC: descr = "HEVC"; break; /* aka H.265 */
>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>> index e7c4dce39007..09fff269e852 100644
>> --- a/include/uapi/linux/videodev2.h
>> +++ b/include/uapi/linux/videodev2.h
>> @@ -757,6 +757,7 @@ struct v4l2_pix_format {
>> #define V4L2_PIX_FMT_VC1_ANNEX_L v4l2_fourcc('V', 'C', '1', 'L') /* SMPTE 421M Annex L compliant stream */
>> #define V4L2_PIX_FMT_VP8 v4l2_fourcc('V', 'P', '8', '0') /* VP8 */
>> #define V4L2_PIX_FMT_VP8_FRAME v4l2_fourcc('V', 'P', '8', 'F') /* VP8 parsed frame */
>> +#define V4L2_PIX_FMT_WEBP_FRAME v4l2_fourcc('W', 'B', 'P', 'F') /* WEBP VP8 parsed frame */
>> #define V4L2_PIX_FMT_VP9 v4l2_fourcc('V', 'P', '9', '0') /* VP9 */
>> #define V4L2_PIX_FMT_VP9_FRAME v4l2_fourcc('V', 'P', '9', 'F') /* VP9 parsed frame */
>> #define V4L2_PIX_FMT_HEVC v4l2_fourcc('H', 'E', 'V', 'C') /* HEVC aka H.265 */
>
BR,
Hugues.
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