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([2606:6d00:17:ebd3::5ac]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-87cf51ff3c9sm4701776d6.8.2025.10.17.13.02.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Oct 2025 13:02:00 -0700 (PDT) Message-ID: Subject: Re: [PATCH v2 1/5] media: uapi: videodev2: Add support for AV1 stateful decoder From: Nicolas Dufresne To: Deepa Guthyappa Madivalara , Mauro Carvalho Chehab , Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Bryan O'Donoghue Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, kernel test robot Date: Fri, 17 Oct 2025 16:01:59 -0400 In-Reply-To: <20251017-av1_irisdecoder-v2-1-964a5478139e@oss.qualcomm.com> References: <20251017-av1_irisdecoder-v2-0-964a5478139e@oss.qualcomm.com> <20251017-av1_irisdecoder-v2-1-964a5478139e@oss.qualcomm.com> Autocrypt: addr=nicolas@ndufresne.ca; prefer-encrypt=mutual; keydata=mDMEaCN2ixYJKwYBBAHaRw8BAQdAM0EHepTful3JOIzcPv6ekHOenE1u0vDG1gdHFrChD /e0J05pY29sYXMgRHVmcmVzbmUgPG5pY29sYXNAbmR1ZnJlc25lLmNhPoicBBMWCgBEAhsDBQsJCA cCAiICBhUKCQgLAgQWAgMBAh4HAheABQkJZfd1FiEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrjo CGQEACgkQ2UGUUSlgcvQlQwD/RjpU1SZYcKG6pnfnQ8ivgtTkGDRUJ8gP3fK7+XUjRNIA/iXfhXMN abIWxO2oCXKf3TdD7aQ4070KO6zSxIcxgNQFtDFOaWNvbGFzIER1ZnJlc25lIDxuaWNvbGFzLmR1Z nJlc25lQGNvbGxhYm9yYS5jb20+iJkEExYKAEECGwMFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4 AWIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCaCyyxgUJCWX3dQAKCRDZQZRRKWBy9ARJAP96pFmLffZ smBUpkyVBfFAf+zq6BJt769R0al3kHvUKdgD9G7KAHuioxD2v6SX7idpIazjzx8b8rfzwTWyOQWHC AAS0LU5pY29sYXMgRHVmcmVzbmUgPG5pY29sYXMuZHVmcmVzbmVAZ21haWwuY29tPoiZBBMWCgBBF iEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrGYCGwMFCQll93UFCwkIBwICIgIGFQoJCAsCBBYCAw ECHgcCF4AACgkQ2UGUUSlgcvRObgD/YnQjfi4+L8f4fI7p1pPMTwRTcaRdy6aqkKEmKsCArzQBAK8 bRLv9QjuqsE6oQZra/RB4widZPvphs78H0P6NmpIJ Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-Bg5QwTftatcyAjl3ssim" User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 --=-Bg5QwTftatcyAjl3ssim Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Le vendredi 17 octobre 2025 =C3=A0 11:35 -0700, Deepa Guthyappa Madivalara = a =C3=A9crit=C2=A0: > Introduce a new pixel format, V4L2_PIX_FMT_AV1, to the > Video4Linux2(V4L2) API. This format is intended for AV1 > bitstreams in stateful decoding/encoding workflows. > The fourcc code 'AV10' is used to distinguish > this format from the existing V4L2_PIX_FMT_AV1_FRAME, > which is used for stateless AV1 decoder implementation. >=20 > Signed-off-by: Deepa Guthyappa Madivalara > --- > =C2=A0Documentation/userspace-api/media/v4l/pixfmt-compressed.rst | 8 +++= +++++ > =C2=A0include/uapi/linux/videodev2.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 1 + > =C2=A02 files changed, 9 insertions(+) >=20 > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst = b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst > index 806ed73ac474ce0e6df00f902850db9fd0db240e..d82557a6ac30851b4fd432a5c= eab969abaed2e25 100644 > --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst > +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst > @@ -274,6 +274,14 @@ Compressed Formats > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 of macroblocks to decode= a full corresponding frame to the matching > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 capture buffer. > =C2=A0 > +=C2=A0=C2=A0=C2=A0 * .. _V4L2-PIX-FMT-AV1: > + > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - ``V4L2_PIX_FMT_AV1`` > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - 'AV10' > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - AV1 compressed video frame. This format= is adapted for implementing AV1 > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 pipeline. The decoder impleme= nts stateful video decoder and expects one > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Temporal Unit per buffer from= OBU-stream or AnnexB. > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The encoder generates one Tem= poral Unit per buffer. > =C2=A0.. raw:: latex > =C2=A0 > =C2=A0=C2=A0=C2=A0=C2=A0 \normalsize > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev= 2.h > index becd08fdbddb857f8f2bf205d2164dc6e20e80b2..e03cfe0a5ae830595f0bf69b9= 51ca16beaedab72 100644 > --- a/include/uapi/linux/videodev2.h > +++ b/include/uapi/linux/videodev2.h > @@ -775,6 +775,7 @@ struct v4l2_pix_format { > =C2=A0#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* = H264 parsed slices */ > =C2=A0#define V4L2_PIX_FMT_HEVC_SLICE v4l2_fourcc('S', '2', '6', '5') /* = HEVC parsed slices */ > =C2=A0#define V4L2_PIX_FMT_AV1_FRAME v4l2_fourcc('A', 'V', '1', 'F') /* A= V1 parsed frame */ > +#define V4L2_PIX_FMT_AV1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 v4l2_fourcc('A', = 'V', '1', '0') /* AV1 */ An alternative fourcc could be to match the one used in the ISO specificati= on, which is also what browsers and Android uses. It would be "av01", link to t= he spec: http://downloads.aomedia.org/assets/pdf/AV1-ISO-Base-Media-File-Format-Bind= ing-Specification.pdf Though, we never had any requirement in this direction, its just an idea. W= ith or without, I'm happy with the definition. Reviewed-by: Nicolas Dufresne cheers, Nicolas > =C2=A0#define V4L2_PIX_FMT_SPK=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 v4l2_fourcc(= 'S', 'P', 'K', '0') /* Sorenson Spark */ > =C2=A0#define V4L2_PIX_FMT_RV30=C2=A0=C2=A0=C2=A0=C2=A0 v4l2_fourcc('R', = 'V', '3', '0') /* RealVideo 8 */ > =C2=A0#define V4L2_PIX_FMT_RV40=C2=A0=C2=A0=C2=A0=C2=A0 v4l2_fourcc('R', = 'V', '4', '0') /* RealVideo 9 & 10 */ --=-Bg5QwTftatcyAjl3ssim Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCaPKgtwAKCRDZQZRRKWBy 9G1mAQDGt5JQOm/w9g5nqKhv2gVj6S9I2LtZXQK7kIzpHep3EgD/UvNxHjG+9EpN WkjKrbrxs1vYrwA/CnwzIQlfpQbKVgo= =RfIA -----END PGP SIGNATURE----- --=-Bg5QwTftatcyAjl3ssim--