linux-kernel - [PATCH v2 4/4] Documentation: media: Document V4L2_H264_DECODE_PARAM_FLAG

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Message-ID: <20250824180735.765587-5-paulk@sys-base.io>
Date: Sun, 24 Aug 2025 20:07:35 +0200
From: Paul Kocialkowski <paulk@...-base.io>
To: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Nicolas Dufresne <nicolas.dufresne@...labora.com>,
	Paul Kocialkowski <paulk@...-base.io>
Subject: [PATCH v2 4/4] Documentation: media: Document V4L2_H264_DECODE_PARAM_FLAG_PFRAME/BFRAME

These flags are meant for a very specific use-case, add a mention of it.

Signed-off-by: Paul Kocialkowski <paulk@...-base.io>
---
 .../userspace-api/media/v4l/ext-ctrls-codec-stateless.rst | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
index 0da635691fdc..de1e3873385c 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
@@ -618,10 +618,14 @@ Stateless Codec Control ID
       -
     * - ``V4L2_H264_DECODE_PARAM_FLAG_PFRAME``
       - 0x00000008
-      -
+      - All submitted slices for the frame are P slices. This is a compability
+        flag required for decoders that only support decoding such frames, but
+        should not be required for slice-based decoders.
     * - ``V4L2_H264_DECODE_PARAM_FLAG_BFRAME``
       - 0x00000010
-      -
+      - All submitted slices for the frame are B slices. This is a compability
+        flag required for decoders that only support decoding such frames, but
+        should not be required for slice-based decoders.
 
 .. raw:: latex
 
-- 
2.50.1