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Date:   Mon,  4 Jan 2021 11:11:53 +0530
From:   Dikshita Agarwal <>
Cc:,,, Dikshita Agarwal <>
Subject: [PATCH v4 1/2] media: v4l2-ctrl: Add base layer priority id control.

This control indicates the priority id to be applied
to base layer.

Signed-off-by: Dikshita Agarwal <>
 Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 9 +++++++++
 drivers/media/v4l2-core/v4l2-ctrls.c                      | 1 +
 include/uapi/linux/v4l2-controls.h                        | 1 +
 3 files changed, 11 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 1675bcf..24df818 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -3655,3 +3655,12 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
        This provides a bitmask which consists of bits [0, LTR_COUNT-1].
        This is applicable to H264 and HEVC encoder and can be applied using
        Request Api.
+    Specifies a priority identifier for the NAL unit, which will be applied to
+    the base layer. By default this value is set to 0 for the base layer,
+    and the next layer will have the priority ID assigned as 1, 2, 3 and so on.
+    The video encoder can't decide the priority id to be applied to a layer,
+    so this has to come from client.
+    This is applicable to H264 and valid Range is from 0 to 63.
+    Source Rec. ITU-T H.264 (06/2019); G., G.8.8.1
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 2ad6b5a..9bd795f 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -953,6 +953,7 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_MPEG_VIDEO_LTR_COUNT:			return "LTR Count";
 	case V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX:		return "frame LTR index";
 	case V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES:		return "Use LTR Frames";
+	case V4L2_CID_MPEG_VIDEO_BASELAYER_PRIORITY_ID:		return "Base Layer Priority ID";
 	case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:		return "MPEG-2 Slice Parameters";
 	case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:		return "MPEG-2 Quantization Matrices";
 	case V4L2_CID_FWHT_I_FRAME_QP:				return "FWHT I-Frame QP Value";
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index c0bb87b..404e69c 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -425,6 +425,7 @@ enum v4l2_mpeg_video_multi_slice_mode {
 /* CIDs for the MPEG-2 Part 2 (H.262) codec */

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