From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
To: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-sunxi@googlegroups.com
Cc: Hans Verkuil <hverkuil@xs4all.nl>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Jonas Karlman <jonas@kwiboo.se>,
Maxime Ripard <mripard@bootlin.com>,
Tomasz Figa <tfiga@chromium.org>,
Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
Chen-Yu Tsai <wens@csie.org>,
Nicolas Dufresne <nicolas@ndufresne.ca>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Ezequiel Garcia <ezequiel@collabora.com>
Subject: [PATCH v8 2/3] media: pixfmt: Document the HEVC slice pixel format
Date: Fri, 27 Sep 2019 16:34:10 +0200 [thread overview]
Message-ID: <20190927143411.141526-3-paul.kocialkowski@bootlin.com> (raw)
In-Reply-To: <20190927143411.141526-1-paul.kocialkowski@bootlin.com>
Document the current state of the HEVC slice pixel format.
The format will need to evolve in the future, which is why it is
not part of the public API.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
.../media/uapi/v4l/pixfmt-compressed.rst | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
index 292fdc116c77..7e9b2b939e59 100644
--- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
@@ -188,6 +188,29 @@ Compressed Formats
If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
then the decoder has no requirements since it can parse all the
information from the raw bytestream.
+ * .. _V4L2-PIX-FMT-HEVC-SLICE:
+
+ - ``V4L2_PIX_FMT_HEVC_SLICE``
+ - 'S265'
+ - HEVC parsed slice data, as extracted from the HEVC bitstream.
+ This format is adapted for stateless video decoders that implement a
+ HEVC pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
+ This pixelformat has two modifiers that must be set at least once
+ through the ``V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE``
+ and ``V4L2_CID_MPEG_VIDEO_HEVC_START_CODE`` controls.
+ Metadata associated with the frame to decode is required to be passed
+ through the following controls :
+ * ``V4L2_CID_MPEG_VIDEO_HEVC_SPS``
+ * ``V4L2_CID_MPEG_VIDEO_HEVC_PPS``
+ * ``V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS``
+ See the :ref:`associated Codec Control IDs <v4l2-mpeg-hevc>`.
+ Buffers associated with this pixel format must contain the appropriate
+ number of macroblocks to decode a full corresponding frame.
+
+ .. note::
+
+ This format is not yet part of the public kernel API and it
+ is expected to change.
* .. _V4L2-PIX-FMT-FWHT:
- ``V4L2_PIX_FMT_FWHT``
--
2.23.0
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next prev parent reply other threads:[~2019-09-27 14:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 14:34 [PATCH v8 0/3] HEVC/H.265 stateless support for V4L2 and Cedrus Paul Kocialkowski
2019-09-27 14:34 ` [PATCH v8 1/3] media: v4l: Add definitions for HEVC stateless decoding Paul Kocialkowski
2019-09-27 14:34 ` Paul Kocialkowski [this message]
2019-09-27 14:34 ` [PATCH v8 3/3] media: cedrus: Add HEVC/H.265 decoding support Paul Kocialkowski
2019-10-17 12:57 ` Mauro Carvalho Chehab
2019-10-22 12:40 ` Paul Kocialkowski
2019-10-22 13:17 ` Paul Kocialkowski
2019-10-22 13:37 ` Hans Verkuil
2019-10-22 14:01 ` Paul Kocialkowski
2019-10-22 14:02 ` Hans Verkuil
2019-10-08 21:48 ` [PATCH v8 0/3] HEVC/H.265 stateless support for V4L2 and Cedrus Jernej Škrabec
2019-10-09 7:12 ` Paul Kocialkowski
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