linux-kernel - [PATCH v11 3/4] media: pixfmt: Add H264_SLICE

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Message-Id: <20190524092031.619-4-paul.kocialkowski@bootlin.com>
Date:   Fri, 24 May 2019 11:20:30 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...glegroups.com
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Subject: [PATCH v11 3/4] media: pixfmt: Add H264_SLICE_RAW format documentation

From: Maxime Ripard <maxime.ripard@...tlin.com>

The H264_SLICE_RAW format introduced before is meant for stateless
decoders that will need the H264 parsed slice data without the start code.

Let's document it.

Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
---
 .../media/uapi/v4l/pixfmt-compressed.rst      | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
index 6c961cfb74da..4b701fc7653e 100644
--- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
@@ -52,6 +52,31 @@ Compressed Formats
       - ``V4L2_PIX_FMT_H264_MVC``
       - 'M264'
       - H264 MVC video elementary stream.
+    * .. _V4L2-PIX-FMT-H264-SLICE-RAW:
+
+      - ``V4L2_PIX_FMT_H264_SLICE_RAW``
+      - 'S264'
+      - H264 parsed slice data, without the start code and as
+	extracted from the H264 bitstream.  This format is adapted for
+	stateless video decoders that implement an H264 pipeline
+	(using the :ref:`mem2mem` and :ref:`media-request-api`).
+	Metadata associated with the frame to decode are required to
+	be passed through the ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
+	``V4L2_CID_MPEG_VIDEO_H264_PPS``,
+	``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX``,
+	``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
+	``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls.  See the
+	:ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.  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.
+
+	.. note::
+
+	   This format is not yet part of the public kernel API and it
+	   is expected to change.
+
     * .. _V4L2-PIX-FMT-H263:
 
       - ``V4L2_PIX_FMT_H263``
-- 
2.21.0