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51 lines
2.1 KiB
Diff
51 lines
2.1 KiB
Diff
From 662256810630f6ac6d06ee0cdc5f4660b25f7e98 Mon Sep 17 00:00:00 2001
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From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
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Date: Tue, 22 Oct 2019 12:26:53 -0300
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Subject: [PATCH] media: pixfmt: Document the HEVC slice pixel format
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Commit de06f289283298e2938445019999cec46435375c upstream.
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Document the current state of the HEVC slice pixel format.
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The format will need to evolve in the future, which is why it is
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not part of the public API.
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Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
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Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
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Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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---
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.../media/uapi/v4l/pixfmt-compressed.rst | 23 +++++++++++++++++++
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1 file changed, 23 insertions(+)
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--- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
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+++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
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@@ -188,6 +188,29 @@ Compressed Formats
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If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
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then the decoder has no requirements since it can parse all the
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information from the raw bytestream.
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+ * .. _V4L2-PIX-FMT-HEVC-SLICE:
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+
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+ - ``V4L2_PIX_FMT_HEVC_SLICE``
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+ - 'S265'
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+ - HEVC parsed slice data, as extracted from the HEVC bitstream.
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+ This format is adapted for stateless video decoders that implement a
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+ HEVC pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
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+ This pixelformat has two modifiers that must be set at least once
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+ through the ``V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE``
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+ and ``V4L2_CID_MPEG_VIDEO_HEVC_START_CODE`` controls.
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+ Metadata associated with the frame to decode is required to be passed
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+ through the following controls :
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+ * ``V4L2_CID_MPEG_VIDEO_HEVC_SPS``
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+ * ``V4L2_CID_MPEG_VIDEO_HEVC_PPS``
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+ * ``V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS``
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+ See the :ref:`associated Codec Control IDs <v4l2-mpeg-hevc>`.
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+ Buffers associated with this pixel format must contain the appropriate
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+ number of macroblocks to decode a full corresponding frame.
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+
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+ .. note::
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+
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+ This format is not yet part of the public kernel API and it
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+ is expected to change.
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* .. _V4L2-PIX-FMT-FWHT:
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- ``V4L2_PIX_FMT_FWHT``
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