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Subject: [Patch v2 05/15] Documention: v4l: Documentation for VP9 CIDs.
Date:   Wed,  7 Sep 2022 12:17:05 +0530
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Precedence: bulk

Adds V4l2 controls for VP9 encoder documention.

Cc: linux-fsd@tesla.com
Signed-off-by: Smitha T Murthy <smitha.t@samsung.com>
---
 .../media/v4l/ext-ctrls-codec.rst             | 167 ++++++++++++++++++
 1 file changed, 167 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..2277d83a7cf0 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -2187,6 +2187,16 @@ enum v4l2_mpeg_video_vp8_profile -
     * - ``V4L2_MPEG_VIDEO_VP8_PROFILE_3``
       - Profile 3
 
+VP9 Control Reference
+---------------------
+
+The VP9 controls include controls for encoding parameters of VP9 video
+codec.
+
+.. _vp9-control-id:
+
+VP9 Control IDs
+
 .. _v4l2-mpeg-video-vp9-profile:
 
 ``V4L2_CID_MPEG_VIDEO_VP9_PROFILE``
@@ -2253,6 +2263,163 @@ enum v4l2_mpeg_video_vp9_level -
     * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_6_2``
       - Level 6.2
 
+``V4L2_CID_CODEC_VP9_I_FRAME_QP``
+    Quantization parameter for an I frame for VP9. Valid range: from 1 to 255.
+
+``V4L2_CID_CODEC_VP9_P_FRAME_QP``
+    Quantization parameter for an P frame for VP9. Valid range: from 1 to 255.
+
+``V4L2_CID_CODEC_VP9_MAX_QP``
+    Maximum quantization parameter for VP9. Valid range: from 1 to 255.
+    Recommended range for MFC is from 230 to 255.
+
+``V4L2_CID_CODEC_VP9_MIN_QP``
+    Minimum quantization parameter for VP9. Valid range: from 1 to 255.
+    Recommended range for MFC is from 1 to 24.
+
+``V4L2_CID_CODEC_VP9_RC_FRAME_RATE``
+    Indicates the number of evenly spaced subintervals, called ticks, within
+    one second. This is a 16 bit unsigned integer and has a maximum value up to
+    0xffff and a minimum value of 1.
+
+``V4L2_CID_CODEC_VP9_GF_REFRESH_PERIOD``
+    Indicates the refresh period of the golden frame for VP9 encoder.
+
+.. _v4l2-vp9-golden-frame-sel:
+
+``V4L2_CID_CODEC_VP9_GOLDEN_FRAMESEL``
+    (enum)
+
+enum v4l2_mpeg_vp9_golden_framesel -
+    Selects the golden frame for encoding. Valid when NUM_OF_REF is 2.
+    Possible values are:
+
+.. raw:: latex
+
+    \footnotesize
+
+.. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    * - ``V4L2_CID_CODEC_VP9_GOLDEN_FRAME_USE_PREV``
+      - Use the (n-2)th frame as a golden frame, current frame index being
+        'n'.
+    * - ``V4L2_CID_CODEC_VP9_GOLDEN_FRAME_USE_REF_PERIOD``
+      - Use the previous specific frame indicated by
+        ``V4L2_CID_CODEC_VP9_GF_REFRESH_PERIOD`` as a
+        golden frame.
+
+.. raw:: latex
+
+    \normalsize
+
+
+``V4L2_CID_CODEC_VP9_HIERARCHY_QP_ENABLE``
+    Allows host to specify the quantization parameter values for each
+    temporal layer through HIERARCHICAL_QP_LAYER. This is valid only
+    if HIERARCHICAL_CODING_LAYER is greater than 1. Setting the control
+    value to 1 enables setting of the QP values for the layers.
+
+.. _v4l2-vp9-ref-number-of-pframes:
+
+``V4L2_CID_CODEC_VP9_REF_NUMBER_FOR_PFRAMES``
+    (enum)
+
+enum v4l2_mpeg_vp9_ref_num_for_pframes -
+    Number of reference pictures for encoding P frames.
+
+.. raw:: latex
+
+    \footnotesize
+
+.. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    * - ``V4L2_CID_CODEC_VP9_1_REF_PFRAME``
+      - Indicates one reference frame, last encoded frame will be searched.
+    * - ``V4L2_CID_CODEC_VP9_GOLDEN_FRAME_USE_REF_PERIOD``
+      - Indicates 2 reference frames, last encoded frame and golden frame
+        will be searched.
+
+.. raw:: latex
+
+    \normalsize
+
+
+``V4L2_CID_CODEC_VP9_HIERARCHICAL_CODING_LAYER``
+    Indicates the number of hierarchial coding layer.
+    In normal encoding (non-hierarchial coding), it should be zero.
+    VP9 has upto 3 layer of encoder.
+
+``V4L2_CID_CODEC_VP9_HIERARCHY_RC_ENABLE``
+    Indicates enabling of bit rate for hierarchical coding layers VP9 encoder.
+
+``V4L2_CID_CODEC_VP9_HIER_CODING_L0_BR``
+    Indicates bit rate for hierarchical coding layer 0 for VP9 encoder.
+
+``V4L2_CID_CODEC_VP9_HIER_CODING_L1_BR``
+    Indicates bit rate for hierarchical coding layer 1 for VP9 encoder.
+
+``V4L2_CID_CODEC_VP9_HIER_CODING_L2_BR``
+    Indicates bit rate for hierarchical coding layer 2 for VP9 encoder.
+
+``V4L2_CID_CODEC_VP9_HIER_CODING_L0_QP``
+    Indicates quantization parameter for hierarchical coding layer 0.
+    Valid range: [V4L2_CID_CODEC_VP9_MIN_QP,
+    V4L2_CID_CODEC_VP9_MAX_QP].
+
+``V4L2_CID_CODEC_VP9_HIER_CODING_L1_QP``
+    Indicates quantization parameter for hierarchical coding layer 1.
+    Valid range: [V4L2_CID_CODEC_VP9_MIN_QP,
+    V4L2_CID_CODEC_VP9_MAX_QP].
+
+``V4L2_CID_CODEC_VP9_HIER_CODING_L2_QP``
+    Indicates quantization parameter for hierarchical coding layer 2.
+    Valid range: [V4L2_CID_CODEC_VP9_MIN_QP,
+    V4L2_CID_CODEC_VP9_MAX_QP].
+
+.. _v4l2-vp9-max-partition-depth:
+
+``V4L2_CID_CODEC_VP9_MAX_PARTITION_DEPTH``
+    (enum)
+
+enum v4l2_mpeg_vp9_num_partitions -
+    Indicate maximum coding unit depth.
+
+.. raw:: latex
+
+    \footnotesize
+
+.. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    * - ``V4L2_CID_CODEC_VP9_0_PARTITION``
+      - No coding unit partition depth.
+    * - ``V4L2_CID_CODEC_VP9_1_PARTITION``
+      - Allows one coding unit partition depth.
+
+.. raw:: latex
+
+    \normalsize
+
+
+``V4L2_CID_CODEC_VP9_DISABLE_INTRA_PU_SPLIT``
+    Zero indicates enable intra NxN PU split.
+    One indicates disable intra NxN PU split.
+
+``V4L2_CID_CODEC_VP9_DISABLE_IVF_HEADER``
+    Indicates IVF header generation. Zero indicates enable IVF format.
+    One indicates disable IVF format.
+
 
 High Efficiency Video Coding (HEVC/H.265) Control Reference
 ===========================================================
-- 
2.17.1