[PATCH v2] v4l2-ctrl: Add VP9 codec levels

[Stanimir Varbanov]

Add menu control for VP9 codec levels. A total of 14 levels are
defined for Profile 0 (8bit) and Profile 2 (10bit). Each level
is a set of constrained bitstreams coded with targeted resolutions,
frame rates, and bitrates.

The definitions have been taken from webm project [1].

[1] https://www.webmproject.org/vp9/levels/

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx>
---
v2: Added links to webmproject in commit message and docs.

 .../media/v4l/ext-ctrls-codec.rst             | 43 +++++++++++++++++++
 drivers/media/v4l2-core/v4l2-ctrls.c          | 21 +++++++++
 include/uapi/linux/v4l2-controls.h            | 17 ++++++++
 3 files changed, 81 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index d0d506a444b1..23a45172404a 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -3316,6 +3316,49 @@ enum v4l2_mpeg_video_vp9_profile -
     * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_3``
       - Profile 3
 
+.. _v4l2-mpeg-video-vp9-level:
+
+``V4L2_CID_MPEG_VIDEO_VP9_LEVEL (enum)``
+
+enum v4l2_mpeg_video_vp9_level -
+    This control allows selecting the level for VP9 encoder.
+    This is also used to enumerate supported levels by VP9 encoder or decoder.
+    More information can be found at
+    `webmproject <https://www.webmproject.org/vp9/levels/>`__. Possible values are:
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_1_0``
+      - Level 1
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_1_1``
+      - Level 1.1
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_2_0``
+      - Level 2
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_2_1``
+      - Level 2.1
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_3_0``
+      - Level 3
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_3_1``
+      - Level 3.1
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_4_0``
+      - Level 4
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_4_1``
+      - Level 4.1
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_5_0``
+      - Level 5
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_5_1``
+      - Level 5.1
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_5_2``
+      - Level 5.2
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_6_0``
+      - Level 6
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_6_1``
+      - Level 6.1
+    * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_6_2``
+      - Level 6.2
+
 
 High Efficiency Video Coding (HEVC/H.265) Control Reference
 ===========================================================
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 3f3fbcd60cc6..359dc737053d 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -474,6 +474,23 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
 		"3",
 		NULL,
 	};
+	static const char * const vp9_level[] = {
+		"1",
+		"1.1",
+		"2",
+		"2.1",
+		"3",
+		"3.1",
+		"4",
+		"4.1",
+		"5",
+		"5.1",
+		"5.2",
+		"6",
+		"6.1",
+		"6.2",
+		NULL,
+	};
 
 	static const char * const flash_led_mode[] = {
 		"Off",
@@ -685,6 +702,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
 		return vp8_profile;
 	case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
 		return vp9_profile;
+	case V4L2_CID_MPEG_VIDEO_VP9_LEVEL:
+		return vp9_level;
 	case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
 		return jpeg_chroma_subsampling;
 	case V4L2_CID_DV_TX_MODE:
@@ -938,6 +957,7 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP:		return "VPX P-Frame QP Value";
 	case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:			return "VP8 Profile";
 	case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:			return "VP9 Profile";
+	case V4L2_CID_MPEG_VIDEO_VP9_LEVEL:			return "VP9 Level";
 	case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER:		return "VP8 Frame Header";
 
 	/* HEVC controls */
@@ -1294,6 +1314,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
 	case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
 	case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
+	case V4L2_CID_MPEG_VIDEO_VP9_LEVEL:
 	case V4L2_CID_DETECT_MD_MODE:
 	case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
 	case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 62271418c1be..1b0bc79c1bc3 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -650,6 +650,23 @@ enum v4l2_mpeg_video_vp9_profile {
 	V4L2_MPEG_VIDEO_VP9_PROFILE_2				= 2,
 	V4L2_MPEG_VIDEO_VP9_PROFILE_3				= 3,
 };
+#define V4L2_CID_MPEG_VIDEO_VP9_LEVEL			(V4L2_CID_MPEG_BASE+513)
+enum v4l2_mpeg_video_vp9_level {
+	V4L2_MPEG_VIDEO_VP9_LEVEL_1_0	= 0,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_1_1	= 1,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_2_0	= 2,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_2_1	= 3,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_3_0	= 4,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_3_1	= 5,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_4_0	= 6,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_4_1	= 7,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_5_0	= 8,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_5_1	= 9,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_5_2	= 10,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_6_0	= 11,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_6_1	= 12,
+	V4L2_MPEG_VIDEO_VP9_LEVEL_6_2	= 13,
+};
 
 /* CIDs for HEVC encoding. */
 
-- 
2.17.1