linux-kernel - [PATCH 1/2] media: v4l2-ctrls: add encoder maximum bitrate control

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Date: Thu, 18 Jan 2024 16:29:33 +0530
From: Sachin Kumar Garg <quic_sachinku@...cinc.com>
To: <hverkuil-cisco@...all.nl>, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Vikash Garodia
	<quic_vgarodia@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
CC: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>
Subject: [PATCH 1/2] media: v4l2-ctrls: add encoder maximum bitrate control

Introduce V4L2_MPEG_VIDEO_BITRATE_MODE_MBR rate control to
limit the frame level maximum bit rate.
Encoder will choose appropriate quantization parameter and
do the smart bit allocation to set the frame maximum bitrate
level as per the Bitrate value configured.

Signed-off-by: Sachin Kumar Garg <quic_sachinku@...cinc.com>
---
 Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 ++
 drivers/media/v4l2-core/v4l2-ctrls-defs.c                 | 1 +
 include/uapi/linux/v4l2-controls.h                        | 1 +
 3 files changed, 4 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 2a165ae063fb..05ef4a70e3f5 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -576,6 +576,8 @@ enum v4l2_mpeg_video_bitrate_mode -
       - Constant bitrate
     * - ``V4L2_MPEG_VIDEO_BITRATE_MODE_CQ``
       - Constant quality
+    * - ``V4L2_MPEG_VIDEO_BITRATE_MODE_MBR``
+      - Maximum bitrate
 
 
 
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
index 8696eb1cdd61..e0597b61ffb9 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -154,6 +154,7 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
 		"Variable Bitrate",
 		"Constant Bitrate",
 		"Constant Quality",
+		"Maximum Bitrate",
 		NULL
 	};
 	static const char * const mpeg_stream_type[] = {
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 99c3f5e99da7..7c74d6c417d1 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -393,6 +393,7 @@ enum v4l2_mpeg_video_bitrate_mode {
 	V4L2_MPEG_VIDEO_BITRATE_MODE_VBR = 0,
 	V4L2_MPEG_VIDEO_BITRATE_MODE_CBR = 1,
 	V4L2_MPEG_VIDEO_BITRATE_MODE_CQ  = 2,
+	V4L2_MPEG_VIDEO_BITRATE_MODE_MBR = 3,
 };
 #define V4L2_CID_MPEG_VIDEO_BITRATE		(V4L2_CID_CODEC_BASE+207)
 #define V4L2_CID_MPEG_VIDEO_BITRATE_PEAK	(V4L2_CID_CODEC_BASE+208)
-- 
2.34.1