From 516109a6e3a4533346718a94061aa4ff172a5ec2 Mon Sep 17 00:00:00 2001
From: Alexandre Courbot <acourbot@chromium.org>
Date: Thu, 25 Mar 2021 22:02:03 +0900
Subject: [PATCH] CHROMIUM: v4l: add request-based VP9 stateless controls

Add the VP9 controls that Chromium is currently using along with the
request API.

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Change-Id: Iad4a25aaa076a6e6e159add501d256f8e0bd6af3
---
 include/uapi/linux/media/vp9-ctrls.h | 492 +++++++++++++++++++++++++++
 1 file changed, 492 insertions(+)
 create mode 100644 include/uapi/linux/media/vp9-ctrls.h

diff --git a/include/uapi/linux/media/vp9-ctrls.h b/include/uapi/linux/media/vp9-ctrls.h
new file mode 100644
index 000000000000..c71e36e121e3
--- /dev/null
+++ b/include/uapi/linux/media/vp9-ctrls.h
@@ -0,0 +1,492 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * These are the VP9 state controls for use with stateless VP9
+ * codec drivers.
+ *
+ * It turns out that these structs are not stable yet and will undergo
+ * more changes. So keep them private until they are stable and ready to
+ * become part of the official public API.
+ */
+
+#ifndef _VP9_CTRLS_H_
+#define _VP9_CTRLS_H_
+
+#include <linux/types.h>
+
+#define V4L2_PIX_FMT_VP9_FRAME v4l2_fourcc('V', 'P', '9', 'F')
+
+#define V4L2_CID_MPEG_VIDEO_VP9_FRAME_CONTEXT(i)	(V4L2_CID_MPEG_BASE + 4000 + (i))
+#define V4L2_CID_MPEG_VIDEO_VP9_FRAME_DECODE_PARAMS	(V4L2_CID_MPEG_BASE + 4004)
+#define V4L2_CTRL_TYPE_VP9_FRAME_CONTEXT		0x400
+#define V4L2_CTRL_TYPE_VP9_FRAME_DECODE_PARAMS		0x404
+
+/**
+ * enum v4l2_vp9_loop_filter_flags - VP9 loop filter flags
+ *
+ * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED: the filter level depends on
+ *					     the mode and reference frame used
+ *					     to predict a block
+ * @V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE: the bitstream contains additional
+ *					    syntax elements that specify which
+ *					    mode and reference frame deltas
+ *					    are to be updated
+ *
+ * Those are the flags you should pass to &v4l2_vp9_loop_filter.flags. See
+ * section '7.2.8 Loop filter semantics' of the VP9 specification for more
+ * details.
+ */
+enum v4l2_vp9_loop_filter_flags {
+	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED = 1 << 0,
+	V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE = 1 << 1,
+};
+
+/**
+ * struct v4l2_vp9_loop_filter - VP9 loop filter parameters
+ *
+ * @flags: combination of V4L2_VP9_LOOP_FILTER_FLAG_* flags
+ * @level: indicates the loop filter strength
+ * @sharpness: indicates the sharpness level
+ * @ref_deltas: contains the adjustment needed for the filter level based on
+ *		the chosen reference frame
+ * @mode_deltas: contains the adjustment needed for the filter level based on
+ *		 the chosen mode
+ * @level_lookup: level lookup table
+ *
+ * This structure contains all loop filter related parameters. See sections
+ * '7.2.8 Loop filter semantics' and '8.8.1 Loop filter frame init process'
+ * of the VP9 specification for more details.
+ */
+struct v4l2_vp9_loop_filter {
+	__u8 flags;
+	__u8 level;
+	__u8 sharpness;
+	__s8 ref_deltas[4];
+	__s8 mode_deltas[2];
+	__u8 level_lookup[8][4][2];
+};
+
+/**
+ * struct v4l2_vp9_quantization - VP9 quantization parameters
+ *
+ * @base_q_idx: indicates the base frame qindex
+ * @delta_q_y_dc: indicates the Y DC quantizer relative to base_q_idx
+ * @delta_q_uv_dc: indicates the UV DC quantizer relative to base_q_idx
+ * @delta_q_uv_ac indicates the UV AC quantizer relative to base_q_idx
+ * @padding: padding bytes to align things on 64 bits. Must be set to 0
+ *
+ * Encodes the quantization parameters. See section '7.2.9 Quantization params
+ * syntax' of the VP9 specification for more details.
+ */
+struct v4l2_vp9_quantization {
+	/* TODO LOSSLESS flag missing? */
+	__u8 base_q_idx;
+	__s8 delta_q_y_dc;
+	__s8 delta_q_uv_dc;
+	__s8 delta_q_uv_ac;
+	__u8 padding[4];
+};
+
+/**
+ * enum v4l2_vp9_segmentation_flags - VP9 segmentation flags
+ *
+ * @V4L2_VP9_SEGMENTATION_FLAG_ENABLED: indicates that this frame makes use of
+ *					the segmentation tool
+ * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP: indicates that the segmentation map
+ *					   should be updated during the
+ *					   decoding of this frame
+ * @V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE: indicates that the updates to
+ *						the segmentation map are coded
+ *						relative to the existing
+ *						segmentation map
+ * @V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA: indicates that new parameters are
+ *					    about to be specified for each
+ *					    segment
+ * @V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE: indicates that the
+ *						    segmentation parameters
+ *						    represent the actual values
+ *						    to be used
+ *
+ * Those are the flags you should pass to &v4l2_vp9_segmentation.flags. See
+ * section '7.2.10 Segmentation params syntax' of the VP9 specification for
+ * more details.
+ */
+enum v4l2_vp9_segmentation_flags {
+	V4L2_VP9_SEGMENTATION_FLAG_ENABLED = 1 << 0,
+	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP = 1 << 1,
+	V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE = 1 << 2,
+	V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA = 1 << 3,
+	V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE = 1 << 4,
+};
+
+#define V4L2_VP9_SEGMENT_FEATURE_ENABLED(id)	(1 << (id))
+#define V4L2_VP9_SEGMENT_FEATURE_ENABLED_MASK	0xf
+
+/**
+ * enum v4l2_vp9_segment_feature - VP9 segment feature IDs
+ *
+ * @V4L2_VP9_SEGMENT_FEATURE_QP_DELTA: QP delta segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_LF: loop filter segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_REF_FRAME: reference frame segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_SKIP: skip segment feature
+ * @V4L2_VP9_SEGMENT_FEATURE_CNT: number of segment features
+ *
+ * Segment feature IDs. See section '7.2.10 Segmentation params syntax' of the
+ * VP9 specification for more details.
+ */
+enum v4l2_vp9_segment_feature {
+	V4L2_VP9_SEGMENT_FEATURE_QP_DELTA,
+	V4L2_VP9_SEGMENT_FEATURE_LF,
+	V4L2_VP9_SEGMENT_FEATURE_REF_FRAME,
+	V4L2_VP9_SEGMENT_FEATURE_SKIP,
+	V4L2_VP9_SEGMENT_FEATURE_CNT,
+};
+
+/**
+ * struct v4l2_vp9_segmentation - VP9 segmentation parameters
+ *
+ * @flags: combination of V4L2_VP9_SEGMENTATION_FLAG_* flags
+ * @tree_probs: specifies the probability values to be used when
+ *              decoding a Segment-ID. See '5.15. Segmentation map'
+ *              section of the VP9 specification for more details.
+ * @pred_prob: specifies the probability values to be used when decoding a
+ *	       Predicted-Segment-ID. See '6.4.14. Get segment id syntax'
+ *	       section of :ref:`vp9` for more details..
+ * @padding: padding used to make things aligned on 64 bits. Shall be zero
+ *	     filled
+ * @feature_enabled: bitmask defining which features are enabled in each
+ *		     segment
+ * @feature_data: data attached to each feature. Data entry is only valid if
+ *		  the feature is enabled
+ *
+ * Encodes the quantization parameters. See section '7.2.10 Segmentation
+ * params syntax' of the VP9 specification for more details.
+ */
+struct v4l2_vp9_segmentation {
+	__u8 flags;
+	__u8 tree_probs[7];
+	__u8 pred_probs[3];
+	__u8 padding[5];
+	__u8 feature_enabled[8];
+	__s16 feature_data[8][4];
+};
+
+/**
+ * enum v4l2_vp9_intra_prediction_mode - VP9 Intra prediction modes
+ *
+ * @V4L2_VP9_INTRA_PRED_DC: DC intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_V: vertical intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_H: horizontal intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D45: D45 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D135: D135 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D117: D117 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D153: D153 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D207: D207 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_D63: D63 intra prediction
+ * @V4L2_VP9_INTRA_PRED_MODE_TM: True Motion intra prediction
+ *
+ * See section '7.4.5 Intra frame mode info semantics' for more details.
+ */
+// TODO where is this used??
+enum v4l2_vp9_intra_prediction_mode {
+	V4L2_VP9_INTRA_PRED_MODE_DC,
+	V4L2_VP9_INTRA_PRED_MODE_V,
+	V4L2_VP9_INTRA_PRED_MODE_H,
+	V4L2_VP9_INTRA_PRED_MODE_D45,
+	V4L2_VP9_INTRA_PRED_MODE_D135,
+	V4L2_VP9_INTRA_PRED_MODE_D117,
+	V4L2_VP9_INTRA_PRED_MODE_D153,
+	V4L2_VP9_INTRA_PRED_MODE_D207,
+	V4L2_VP9_INTRA_PRED_MODE_D63,
+	V4L2_VP9_INTRA_PRED_MODE_TM,
+};
+
+/**
+ * struct v4l2_vp9_mv_probabilities - VP9 Motion vector probabilities
+ * @joint: motion vector joint probabilities
+ * @sign: motion vector sign probabilities
+ * @class_: motion vector class probabilities
+ * @class0_bit: motion vector class0 bit probabilities
+ * @bits: motion vector bits probabilities
+ * @class0_fr: motion vector class0 fractional bit probabilities
+ * @fr: motion vector fractional bit probabilities
+ * @class0_hp: motion vector class0 high precision fractional bit probabilities
+ * @hp: motion vector high precision fractional bit probabilities
+ */
+struct v4l2_vp9_mv_probabilities {
+	__u8 joint[3];
+	__u8 sign[2];
+	__u8 class_[2][10];
+	__u8 class0_bit[2];
+	__u8 bits[2][10];
+	__u8 class0_fr[2][2][3];
+	__u8 fr[2][3];
+	__u8 class0_hp[2];
+	__u8 hp[2];
+};
+
+/**
+ * struct v4l2_vp9_probabilities - VP9 Probabilities
+ *
+ * @tx8: TX 8x8 probabilities
+ * @tx16: TX 16x16 probabilities
+ * @tx32: TX 32x32 probabilities
+ * @coef: coefficient probabilities
+ * @skip: skip probabilities
+ * @inter_mode: inter mode probabilities
+ * @interp_filter: interpolation filter probabilities
+ * @is_inter: is inter-block probabilities
+ * @comp_mode: compound prediction mode probabilities
+ * @single_ref: single ref probabilities
+ * @comp_ref: compound ref probabilities
+ * @y_mode: Y prediction mode probabilities
+ * @uv_mode: UV prediction mode probabilities
+ * @partition: partition probabilities
+ * @mv: motion vector probabilities
+ *
+ * Structure containing most VP9 probabilities. See the VP9 specification
+ * for more details.
+ */
+struct v4l2_vp9_probabilities {
+	__u8 tx8[2][1];
+	__u8 tx16[2][2];
+	__u8 tx32[2][3];
+	__u8 coef[4][2][2][6][6][3];
+	__u8 skip[3];
+	__u8 inter_mode[7][3];
+	__u8 interp_filter[4][2];
+	__u8 is_inter[4];
+	__u8 comp_mode[5];
+	__u8 single_ref[5][2];
+	__u8 comp_ref[5];
+	__u8 y_mode[4][9];
+	__u8 uv_mode[10][9];
+	__u8 partition[16][3];
+
+	struct v4l2_vp9_mv_probabilities mv;
+};
+
+/**
+ * enum v4l2_vp9_reset_frame_context - Valid values for
+ *			&v4l2_ctrl_vp9_frame_decode_params->reset_frame_context
+ *
+ * @V4L2_VP9_RESET_FRAME_CTX_NONE: don't reset any frame context
+ * @V4L2_VP9_RESET_FRAME_CTX_SPEC: reset the frame context pointed by
+ *			&v4l2_ctrl_vp9_frame_decode_params.frame_context_idx
+ * @V4L2_VP9_RESET_FRAME_CTX_ALL: reset all frame contexts
+ *
+ * See section '7.2 Uncompressed header semantics' of the VP9 specification
+ * for more details.
+ */
+enum v4l2_vp9_reset_frame_context {
+	V4L2_VP9_RESET_FRAME_CTX_NONE,
+	V4L2_VP9_RESET_FRAME_CTX_SPEC,
+	V4L2_VP9_RESET_FRAME_CTX_ALL,
+};
+
+/**
+ * enum v4l2_vp9_interpolation_filter - VP9 interpolation filter types
+ *
+ * @V4L2_VP9_INTERP_FILTER_8TAP: height tap filter
+ * @V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH: height tap smooth filter
+ * @V4L2_VP9_INTERP_FILTER_8TAP_SHARP: height tap sharp filter
+ * @V4L2_VP9_INTERP_FILTER_BILINEAR: bilinear filter
+ * @V4L2_VP9_INTERP_FILTER_SWITCHABLE: filter selection is signaled at the
+ *				       block level
+ *
+ * See section '7.2.7 Interpolation filter semantics' of the VP9 specification
+ * for more details.
+ */
+enum v4l2_vp9_interpolation_filter {
+	V4L2_VP9_INTERP_FILTER_8TAP,
+	V4L2_VP9_INTERP_FILTER_8TAP_SMOOTH,
+	V4L2_VP9_INTERP_FILTER_8TAP_SHARP,
+	V4L2_VP9_INTERP_FILTER_BILINEAR,
+	V4L2_VP9_INTERP_FILTER_SWITCHABLE,
+};
+
+/**
+ * enum v4l2_vp9_reference_mode - VP9 reference modes
+ *
+ * @V4L2_VP9_REF_MODE_SINGLE: indicates that all the inter blocks use only a
+ *			      single reference frame to generate motion
+ *			      compensated prediction
+ * @V4L2_VP9_REF_MODE_COMPOUND: requires all the inter blocks to use compound
+ *				mode. Single reference frame prediction is not
+ *				allowed
+ * @V4L2_VP9_REF_MODE_SELECT: allows each individual inter block to select
+ *			      between single and compound prediction modes
+ *
+ * See section '7.3.6 Frame reference mode semantics' of the VP9 specification
+ * for more details.
+ */
+enum v4l2_vp9_reference_mode {
+	V4L2_VP9_REF_MODE_SINGLE,
+	V4L2_VP9_REF_MODE_COMPOUND,
+	V4L2_VP9_REF_MODE_SELECT,
+};
+
+/**
+ * enum v4l2_vp9_tx_mode - VP9 TX modes
+ *
+ * @V4L2_VP9_TX_MODE_ONLY_4X4: transform size is 4x4
+ * @V4L2_VP9_TX_MODE_ALLOW_8X8: transform size can be up to 8x8
+ * @V4L2_VP9_TX_MODE_ALLOW_16X16: transform size can be up to 16x16
+ * @V4L2_VP9_TX_MODE_ALLOW_32X32: transform size can be up to 32x32
+ * @V4L2_VP9_TX_MODE_SELECT: bitstream contains transform size for each block
+ *
+ * See section '7.3.1 Tx mode semantics' of the VP9 specification for more
+ * details.
+ */
+enum v4l2_vp9_tx_mode {
+	V4L2_VP9_TX_MODE_ONLY_4X4,
+	V4L2_VP9_TX_MODE_ALLOW_8X8,
+	V4L2_VP9_TX_MODE_ALLOW_16X16,
+	V4L2_VP9_TX_MODE_ALLOW_32X32,
+	V4L2_VP9_TX_MODE_SELECT,
+};
+
+/**
+ * enum v4l2_vp9_ref_id - VP9 Reference frame IDs
+ *
+ * @V4L2_REF_ID_LAST: last reference frame
+ * @V4L2_REF_ID_GOLDEN: golden reference frame
+ * @V4L2_REF_ID_ALTREF: alternative reference frame
+ * @V4L2_REF_ID_CNT: number of reference frames
+ *
+ * See section '7.4.12 Ref frames semantics' of the VP9 specification for more
+ * details.
+ */
+enum v4l2_vp9_ref_id {
+	V4L2_REF_ID_LAST,
+	V4L2_REF_ID_GOLDEN,
+	V4L2_REF_ID_ALTREF,
+	V4L2_REF_ID_CNT,
+};
+
+/**
+ * enum v4l2_vp9_frame_flags - VP9 frame flags
+ * @V4L2_VP9_FRAME_FLAG_KEY_FRAME: the frame is a key frame
+ * @V4L2_VP9_FRAME_FLAG_SHOW_FRAME: the frame should be displayed
+ * @V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT: the decoding should be error resilient
+ * @V4L2_VP9_FRAME_FLAG_INTRA_ONLY: the frame does not reference other frames
+ * @V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV: the frame might can high precision
+ *					    motion vectors
+ * @V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX: frame context should be updated
+ *					   after decoding
+ * @V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE: parallel decoding is used
+ * @V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING: vertical subsampling is enabled
+ * @V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING: horizontal subsampling is enabled
+ * @V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING: full UV range is used
+ *
+ * Check the VP9 specification for more details.
+ */
+enum v4l2_vp9_frame_flags {
+	V4L2_VP9_FRAME_FLAG_KEY_FRAME = 1 << 0,
+	V4L2_VP9_FRAME_FLAG_SHOW_FRAME = 1 << 1,
+	V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT = 1 << 2,
+	V4L2_VP9_FRAME_FLAG_INTRA_ONLY = 1 << 3,
+	V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV = 1 << 4,
+	V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX = 1 << 5,
+	V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE = 1 << 6,
+	V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING = 1 << 7,
+	V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING = 1 << 8,
+	V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING = 1 << 9,
+};
+
+#define V4L2_VP9_PROFILE_MAX		3
+
+/**
+ * struct v4l2_ctrl_vp9_frame_decode_params - VP9 frame decoding control
+ *
+ * @flags: combination of V4L2_VP9_FRAME_FLAG_* flags
+ * @compressed_header_size: compressed header size in bytes
+ * @uncompressed_header_size: uncompressed header size in bytes
+ * @profile: VP9 profile. Can be 0, 1, 2 or 3
+ * @reset_frame_context: specifies whether the frame context should be reset
+ *			 to default values. See &v4l2_vp9_reset_frame_context
+ *			 for more details
+ * @frame_context_idx: frame context that should be used/updated
+ * @bit_depth: bits per components. Can be 8, 10 or 12. Note that not all
+ *	       profiles support 10 and/or 12 bits depths
+ * @interpolation_filter: specifies the filter selection used for performing
+ *			  inter prediction. See &v4l2_vp9_interpolation_filter
+ *			  for more details
+ * @tile_cols_log2: specifies the base 2 logarithm of the width of each tile
+ *		    (where the width is measured in units of 8x8 blocks).
+ *		    Shall be less than or equal to 6
+ * @tile_rows_log2: specifies the base 2 logarithm of the height of each tile
+ *		    (where the height is measured in units of 8x8 blocks)
+ * @tx_mode: specifies the TX mode. See &v4l2_vp9_tx_mode for more details
+ * @reference_mode: specifies the type of inter prediction to be used. See
+ *		    &v4l2_vp9_reference_mode for more details
+ * @ref_frame_sign_biases: intended direction in time of the motion vector for
+ *                         each reference frame (0: backward, 1: forward).
+ *                         Only the first V4L2_REF_ID_CNT are used.
+ * @padding: needed to make this struct 64 bit aligned. Shall be filled with
+ *	     zeros
+ * @frame_width_minus_1: add 1 to it and you'll get the frame width expressed
+ *			 in pixels
+ * @frame_height_minus_1: add 1 to it and you'll get the frame height expressed
+ *			  in pixels
+ * @frame_width_minus_1: add 1 to it and you'll get the expected render width
+ *			 expressed in pixels. This is not used during the
+ *			 decoding process but might be used by HW scalers to
+ *			 prepare a frame that's ready for scanout
+ * @frame_height_minus_1: add 1 to it and you'll get the expected render height
+ *			 expressed in pixels. This is not used during the
+ *			 decoding process but might be used by HW scalers to
+ *			 prepare a frame that's ready for scanout
+ * @refs: array of reference frames, identified by timestamp. See
+          &v4l2_vp9_ref_id for more details
+ * @lf: loop filter parameters. See &v4l2_vp9_loop_filter for more details
+ * @quant: quantization parameters. See &v4l2_vp9_quantization for more details
+ * @seg: segmentation parameters. See &v4l2_vp9_segmentation for more details
+ * @probs: probabilities. See &v4l2_vp9_probabilities for more details
+ */
+struct v4l2_ctrl_vp9_frame_decode_params {
+	__u32 flags;
+	__u16 compressed_header_size;
+	__u16 uncompressed_header_size;
+	__u8 profile;
+	__u8 reset_frame_context;
+	__u8 frame_context_idx;
+	__u8 bit_depth;
+	__u8 interpolation_filter;
+	__u8 tile_cols_log2;
+	__u8 tile_rows_log2;
+	__u8 tx_mode;
+	__u8 reference_mode;
+	__u8 ref_frame_sign_biases;
+	__u8 padding[5];
+	__u16 frame_width_minus_1;
+	__u16 frame_height_minus_1;
+	__u16 render_width_minus_1;
+	__u16 render_height_minus_1;
+	__u64 refs[V4L2_REF_ID_CNT];
+	struct v4l2_vp9_loop_filter lf;
+	struct v4l2_vp9_quantization quant;
+	struct v4l2_vp9_segmentation seg;
+	struct v4l2_vp9_probabilities probs;
+};
+
+#define V4L2_VP9_NUM_FRAME_CTX	4
+
+/**
+ * struct v4l2_ctrl_vp9_frame_ctx - VP9 frame context control
+ *
+ * @probs: VP9 probabilities
+ *
+ * This control is accessed in both direction. The user should initialize the
+ * 4 contexts with default values just after starting the stream. Then before
+ * decoding a frame it should query the current frame context (the one passed
+ * through &v4l2_ctrl_vp9_frame_decode_params.frame_context_idx) to initialize
+ * &v4l2_ctrl_vp9_frame_decode_params.probs. The probs are then adjusted based
+ * on the bitstream info and passed to the kernel. The codec should update
+ * the frame context after the frame has been decoded, so that next time
+ * userspace query this context it contains the updated probabilities.
+ */
+struct v4l2_ctrl_vp9_frame_ctx {
+	struct v4l2_vp9_probabilities probs;
+};
+
+#endif /* _VP9_CTRLS_H_ */
-- 
2.31.0.291.g576ba9dcdaf-goog