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media: v4l2-controls: Add control for background detection

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Add a generic V4L2 boolean control V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION
that allows encoders to detect background regions in a frame and use fewer
bits or skip mode to encode them, potentially reducing bitrate for streams
with stationary scenes.

Signed-off-by: Jackson Lee <jackson.lee@chipsnmedia.com>
Signed-off-by: Nas Chung <nas.chung@chipsnmedia.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Jackson Lee
2026-03-24 14:03:57 +09:00
committed by Hans Verkuil
parent b201571470
commit 5d801b5963
3 changed files with 10 additions and 0 deletions
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6
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
View File

@@ -737,6 +737,12 @@ enum v4l2_mpeg_video_frame_skip_mode -
Enable writing sample aspect ratio in the Video Usability
Information. Applicable to the H264 encoder.
``V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION (boolean)``
If enabled, the encoder detect a background region in frame and
use low bits or skip mode to encode the background region.
If a lot of scenes are stationary or background, It may help to
reduce the video bitrate. Applicable to the encoder.
.. _v4l2-mpeg-video-h264-vui-sar-idc:
``V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC``

2
drivers/media/v4l2-core/v4l2-ctrls-defs.c
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@@ -889,6 +889,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY: return "Display Delay";
case V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY_ENABLE: return "Display Delay Enable";
case V4L2_CID_MPEG_VIDEO_AU_DELIMITER: return "Generate Access Unit Delimiters";
case V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION: return "Background Detection";
case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
@@ -1296,6 +1297,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
case V4L2_CID_MPEG_VIDEO_AU_DELIMITER:
case V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION:
case V4L2_CID_WIDE_DYNAMIC_RANGE:
case V4L2_CID_IMAGE_STABILIZATION:
case V4L2_CID_RDS_RECEPTION:

2
include/uapi/linux/v4l2-controls.h
View File

@@ -464,6 +464,8 @@ enum v4l2_mpeg_video_intra_refresh_period_type {
V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD_TYPE_CYCLIC = 1,
};
#define V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION (V4L2_CID_CODEC_BASE + 238)
/* CIDs for the MPEG-2 Part 2 (H.262) codec */
#define V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL (V4L2_CID_CODEC_BASE+270)
enum v4l2_mpeg_video_mpeg2_level {