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* [PATCH v2] media: v4l2-ctrl: Add base layer priority id control.
@ 2020-10-15 11:05 Dikshita Agarwal
  0 siblings, 0 replies; only message in thread
From: Dikshita Agarwal @ 2020-10-15 11:05 UTC (permalink / raw)
  To: linux-media, linux-kernel, linux-arm-msm
  Cc: mchehab, hverkuil-cisco, ezequiel, stanimir.varbanov, vgarodia,
	majja, Dikshita Agarwal

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 6e9240a..aac1ea3 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -4407,3 +4407,12 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
        to the LTR index max 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 base layer.
+       By default this value is set to 0 for base layer.
+       And the next layer will have priority ID assigned as 1,2,3 and so on.
+       Video encode can't decide the priority id to be applied to a layer
+       so this has to come from client.
+       Valid Range: from 0 to 63
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 046198f..c973058 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -952,6 +952,7 @@ 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 "Mark LTR frame index";
 	case V4L2_CID_MPEG_VIDEO_USE_LTR_FRAME:			return "Use LTR Frame";
+	case V4L2_CID_MPEG_VIDEO_BASELAYER_PRIORITYID:		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_MPEG_VIDEO_FWHT_PARAMS:			return "FWHT Stateless Parameters";
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 3801372..433e119 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -418,6 +418,7 @@ enum v4l2_mpeg_video_multi_slice_mode {
 #define V4L2_CID_MPEG_VIDEO_LTR_COUNT                  (V4L2_CID_MPEG_BASE+230)
 #define V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX            (V4L2_CID_MPEG_BASE+231)
 #define V4L2_CID_MPEG_VIDEO_USE_LTR_FRAME              (V4L2_CID_MPEG_BASE+232)
 /* CIDs for the MPEG-2 Part 2 (H.262) codec */

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2020-10-15 11:05 [PATCH v2] media: v4l2-ctrl: Add base layer priority id control Dikshita Agarwal

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