From 8bb22c70316884c5fba31025b63189badffad71c Mon Sep 17 00:00:00 2001
From: Alexandre Courbot <acourbot@chromium.org>
Date: Wed, 24 Feb 2021 16:50:53 +0900
Subject: [PATCH] CHROMIUM: v4l2: add upstream V4L2 H.264 stateless controls

Add the official stable H.264 controls so Chromium can use them. The
controls are up-to-date as to commit 8f202f8e9ff3.

BUG=b:149437087

Change-Id: I4f3f96fe3252db25bb55a94673767428f76bf544
---
 include/uapi/linux/media/h264-ctrls-upstream.h | 405 ++++++++++++++++++++++++++++
 1 file changed, 405 insertions(+)
 create mode 100644 include/media/h264-ctrls-upstream.h

diff --git a/include/uapi/linux/media/h264-ctrls-upstream.h b/include/uapi/linux/media/h264-ctrls-upstream.h
new file mode 100644
index 000000000000..64f6d78a8a82
--- /dev/null
+++ b/include/uapi/linux/media/h264-ctrls-upstream.h
@@ -0,0 +1,405 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * These are the H.264 state controls for use with stateless H.264
+ * 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 _H264_CTRLS_UPSTREAM_H_
+#define _H264_CTRLS_UPSTREAM_H_
+
+#include <linux/videodev2.h>
+
+#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
+
+#define V4L2_CTRL_CLASS_CODEC_STATELESS 0x00a40000	/* Stateless codecs controls */
+
+/*  Stateless CODECs controls */
+#define V4L2_CID_CODEC_STATELESS_BASE          (V4L2_CTRL_CLASS_CODEC_STATELESS | 0x900)
+#define V4L2_CID_CODEC_STATELESS_CLASS         (V4L2_CTRL_CLASS_CODEC_STATELESS | 1)
+
+#define V4L2_CID_STATELESS_H264_DECODE_MODE	(V4L2_CID_CODEC_STATELESS_BASE + 0)
+/**
+ * enum v4l2_stateless_h264_decode_mode - Decoding mode
+ *
+ * @V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED: indicates that decoding
+ * is performed one slice at a time. In this mode,
+ * V4L2_CID_STATELESS_H264_SLICE_PARAMS must contain the parsed slice
+ * parameters and the OUTPUT buffer must contain a single slice.
+ * V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF feature is used
+ * in order to support multislice frames.
+ * @V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED: indicates that
+ * decoding is performed per frame. The OUTPUT buffer must contain
+ * all slices and also both fields. This mode is typically supported
+ * by device drivers that are able to parse the slice(s) header(s)
+ * in hardware. When this mode is selected,
+ * V4L2_CID_STATELESS_H264_SLICE_PARAMS is not used.
+ */
+enum v4l2_stateless_h264_decode_mode {
+	V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED,
+	V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED,
+};
+
+#define V4L2_CID_STATELESS_H264_START_CODE	(V4L2_CID_CODEC_STATELESS_BASE + 1)
+/**
+ * enum v4l2_stateless_h264_start_code - Start code
+ *
+ * @V4L2_STATELESS_H264_START_CODE_NONE: slices are passed
+ * to the driver without any start code.
+ * @V4L2_STATELESS_H264_START_CODE_ANNEX_B: slices are passed
+ * to the driver with an Annex B start code prefix
+ * (legal start codes can be 3-bytes 0x000001 or 4-bytes 0x00000001).
+ * This mode is typically supported by device drivers that parse
+ * the start code in hardware.
+ */
+enum v4l2_stateless_h264_start_code {
+	V4L2_STATELESS_H264_START_CODE_NONE,
+	V4L2_STATELESS_H264_START_CODE_ANNEX_B,
+};
+
+#define V4L2_H264_SPS_CONSTRAINT_SET0_FLAG			0x01
+#define V4L2_H264_SPS_CONSTRAINT_SET1_FLAG			0x02
+#define V4L2_H264_SPS_CONSTRAINT_SET2_FLAG			0x04
+#define V4L2_H264_SPS_CONSTRAINT_SET3_FLAG			0x08
+#define V4L2_H264_SPS_CONSTRAINT_SET4_FLAG			0x10
+#define V4L2_H264_SPS_CONSTRAINT_SET5_FLAG			0x20
+
+#define V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE		0x01
+#define V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS	0x02
+#define V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO		0x04
+#define V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED	0x08
+#define V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY			0x10
+#define V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD		0x20
+#define V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE			0x40
+
+#define V4L2_H264_SPS_HAS_CHROMA_FORMAT(sps) \
+	((sps)->profile_idc == 100 || (sps)->profile_idc == 110 || \
+	 (sps)->profile_idc == 122 || (sps)->profile_idc == 244 || \
+	 (sps)->profile_idc == 44  || (sps)->profile_idc == 83  || \
+	 (sps)->profile_idc == 86  || (sps)->profile_idc == 118 || \
+	 (sps)->profile_idc == 128 || (sps)->profile_idc == 138 || \
+	 (sps)->profile_idc == 139 || (sps)->profile_idc == 134 || \
+	 (sps)->profile_idc == 135)
+
+#define V4L2_CID_STATELESS_H264_SPS		(V4L2_CID_CODEC_STATELESS_BASE + 2)
+/**
+ * struct v4l2_ctrl_h264_sps - H264 sequence parameter set
+ *
+ * All the members on this sequence parameter set structure match the
+ * sequence parameter set syntax as specified by the H264 specification.
+ *
+ * @profile_idc: see H264 specification.
+ * @constraint_set_flags: see H264 specification.
+ * @level_idc: see H264 specification.
+ * @seq_parameter_set_id: see H264 specification.
+ * @chroma_format_idc: see H264 specification.
+ * @bit_depth_luma_minus8: see H264 specification.
+ * @bit_depth_chroma_minus8: see H264 specification.
+ * @log2_max_frame_num_minus4: see H264 specification.
+ * @pic_order_cnt_type: see H264 specification.
+ * @log2_max_pic_order_cnt_lsb_minus4: see H264 specification.
+ * @max_num_ref_frames: see H264 specification.
+ * @num_ref_frames_in_pic_order_cnt_cycle: see H264 specification.
+ * @offset_for_ref_frame: see H264 specification.
+ * @offset_for_non_ref_pic: see H264 specification.
+ * @offset_for_top_to_bottom_field: see H264 specification.
+ * @pic_width_in_mbs_minus1: see H264 specification.
+ * @pic_height_in_map_units_minus1: see H264 specification.
+ * @flags: see V4L2_H264_SPS_FLAG_{}.
+ */
+struct v4l2_ctrl_h264_sps {
+	__u8 profile_idc;
+	__u8 constraint_set_flags;
+	__u8 level_idc;
+	__u8 seq_parameter_set_id;
+	__u8 chroma_format_idc;
+	__u8 bit_depth_luma_minus8;
+	__u8 bit_depth_chroma_minus8;
+	__u8 log2_max_frame_num_minus4;
+	__u8 pic_order_cnt_type;
+	__u8 log2_max_pic_order_cnt_lsb_minus4;
+	__u8 max_num_ref_frames;
+	__u8 num_ref_frames_in_pic_order_cnt_cycle;
+	__s32 offset_for_ref_frame[255];
+	__s32 offset_for_non_ref_pic;
+	__s32 offset_for_top_to_bottom_field;
+	__u16 pic_width_in_mbs_minus1;
+	__u16 pic_height_in_map_units_minus1;
+	__u32 flags;
+};
+
+#define V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE				0x0001
+#define V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT	0x0002
+#define V4L2_H264_PPS_FLAG_WEIGHTED_PRED				0x0004
+#define V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT		0x0008
+#define V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED			0x0010
+#define V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT			0x0020
+#define V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE				0x0040
+#define V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT			0x0080
+
+#define V4L2_CID_STATELESS_H264_PPS		(V4L2_CID_CODEC_STATELESS_BASE + 3)
+/**
+ * struct v4l2_ctrl_h264_pps - H264 picture parameter set
+ *
+ * Except where noted, all the members on this picture parameter set
+ * structure match the sequence parameter set syntax as specified
+ * by the H264 specification.
+ *
+ * In particular, V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT flag
+ * has a specific meaning. This flag should be set if a non-flat
+ * scaling matrix applies to the picture. In this case, applications
+ * are expected to use V4L2_CID_STATELESS_H264_SCALING_MATRIX,
+ * to pass the values of the non-flat matrices.
+ *
+ * @pic_parameter_set_id: see H264 specification.
+ * @seq_parameter_set_id: see H264 specification.
+ * @num_slice_groups_minus1: see H264 specification.
+ * @num_ref_idx_l0_default_active_minus1: see H264 specification.
+ * @num_ref_idx_l1_default_active_minus1: see H264 specification.
+ * @weighted_bipred_idc: see H264 specification.
+ * @pic_init_qp_minus26: see H264 specification.
+ * @pic_init_qs_minus26: see H264 specification.
+ * @chroma_qp_index_offset: see H264 specification.
+ * @second_chroma_qp_index_offset: see H264 specification.
+ * @flags: see V4L2_H264_PPS_FLAG_{}.
+ */
+struct v4l2_ctrl_h264_pps {
+	__u8 pic_parameter_set_id;
+	__u8 seq_parameter_set_id;
+	__u8 num_slice_groups_minus1;
+	__u8 num_ref_idx_l0_default_active_minus1;
+	__u8 num_ref_idx_l1_default_active_minus1;
+	__u8 weighted_bipred_idc;
+	__s8 pic_init_qp_minus26;
+	__s8 pic_init_qs_minus26;
+	__s8 chroma_qp_index_offset;
+	__s8 second_chroma_qp_index_offset;
+	__u16 flags;
+};
+
+#define V4L2_CID_STATELESS_H264_SCALING_MATRIX	(V4L2_CID_CODEC_STATELESS_BASE + 4)
+/**
+ * struct v4l2_ctrl_h264_scaling_matrix - H264 scaling matrices
+ *
+ * @scaling_list_4x4: scaling matrix after applying the inverse
+ * scanning process. Expected list order is Intra Y, Intra Cb,
+ * Intra Cr, Inter Y, Inter Cb, Inter Cr. The values on each
+ * scaling list are expected in raster scan order.
+ * @scaling_list_8x8: scaling matrix after applying the inverse
+ * scanning process. Expected list order is Intra Y, Inter Y,
+ * Intra Cb, Inter Cb, Intra Cr, Inter Cr. The values on each
+ * scaling list are expected in raster scan order.
+ *
+ * Note that the list order is different for the 4x4 and 8x8
+ * matrices as per the H264 specification, see table 7-2 "Assignment
+ * of mnemonic names to scaling list indices and specification of
+ * fall-back rule".
+ */
+struct v4l2_ctrl_h264_scaling_matrix {
+	__u8 scaling_list_4x4[6][16];
+	__u8 scaling_list_8x8[6][64];
+};
+
+struct v4l2_h264_weight_factors {
+	__s16 luma_weight[32];
+	__s16 luma_offset[32];
+	__s16 chroma_weight[32][2];
+	__s16 chroma_offset[32][2];
+};
+
+#define V4L2_H264_CTRL_PRED_WEIGHTS_REQUIRED(pps, slice) \
+	((((pps)->flags & V4L2_H264_PPS_FLAG_WEIGHTED_PRED) && \
+	 ((slice)->slice_type == V4L2_H264_SLICE_TYPE_P || \
+	  (slice)->slice_type == V4L2_H264_SLICE_TYPE_SP)) || \
+	 ((pps)->weighted_bipred_idc == 1 && \
+	  (slice)->slice_type == V4L2_H264_SLICE_TYPE_B))
+
+#define V4L2_CID_STATELESS_H264_PRED_WEIGHTS	(V4L2_CID_CODEC_STATELESS_BASE + 5)
+/**
+ * struct v4l2_ctrl_h264_pred_weights - Prediction weight table
+ *
+ * Prediction weight table, which matches the syntax specified
+ * by the H264 specification.
+ *
+ * @luma_log2_weight_denom: see H264 specification.
+ * @chroma_log2_weight_denom: see H264 specification.
+ * @weight_factors: luma and chroma weight factors.
+ */
+struct v4l2_ctrl_h264_pred_weights {
+	__u16 luma_log2_weight_denom;
+	__u16 chroma_log2_weight_denom;
+	struct v4l2_h264_weight_factors weight_factors[2];
+};
+
+#define V4L2_H264_SLICE_TYPE_P				0
+#define V4L2_H264_SLICE_TYPE_B				1
+#define V4L2_H264_SLICE_TYPE_I				2
+#define V4L2_H264_SLICE_TYPE_SP				3
+#define V4L2_H264_SLICE_TYPE_SI				4
+
+#define V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED	0x01
+#define V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH		0x02
+
+#define V4L2_H264_TOP_FIELD_REF				0x1
+#define V4L2_H264_BOTTOM_FIELD_REF			0x2
+#define V4L2_H264_FRAME_REF				0x3
+
+/**
+ * struct v4l2_h264_reference - H264 picture reference
+ *
+ * @fields: indicates how the picture is referenced.
+ * Valid values are V4L2_H264_{}_REF.
+ * @index: index into v4l2_ctrl_h264_decode_params.dpb[].
+ */
+struct v4l2_h264_reference {
+	__u8 fields;
+	__u8 index;
+};
+
+/*
+ * Maximum DPB size, as specified by section 'A.3.1 Level limits
+ * common to the Baseline, Main, and Extended profiles'.
+ */
+#define V4L2_H264_NUM_DPB_ENTRIES 16
+#define V4L2_H264_REF_LIST_LEN (2 * V4L2_H264_NUM_DPB_ENTRIES)
+
+#define V4L2_CID_STATELESS_H264_SLICE_PARAMS	(V4L2_CID_CODEC_STATELESS_BASE + 6)
+/**
+ * struct v4l2_ctrl_h264_slice_params - H264 slice parameters
+ *
+ * This structure holds the H264 syntax elements that are specified
+ * as non-invariant for the slices in a given frame.
+ *
+ * Slice invariant syntax elements are contained in struct
+ * v4l2_ctrl_h264_decode_params. This is done to reduce the API surface
+ * on frame-based decoders, where slice header parsing is done by the
+ * hardware.
+ *
+ * Slice invariant syntax elements are specified in specification section
+ * "7.4.3 Slice header semantics".
+ *
+ * Except where noted, the members on this struct match the slice header syntax.
+ *
+ * @header_bit_size: offset in bits to slice_data() from the beginning of this slice.
+ * @first_mb_in_slice: see H264 specification.
+ * @slice_type: see H264 specification.
+ * @colour_plane_id: see H264 specification.
+ * @redundant_pic_cnt: see H264 specification.
+ * @cabac_init_idc: see H264 specification.
+ * @slice_qp_delta: see H264 specification.
+ * @slice_qs_delta: see H264 specification.
+ * @disable_deblocking_filter_idc: see H264 specification.
+ * @slice_alpha_c0_offset_div2: see H264 specification.
+ * @slice_beta_offset_div2: see H264 specification.
+ * @num_ref_idx_l0_active_minus1: see H264 specification.
+ * @num_ref_idx_l1_active_minus1: see H264 specification.
+ * @reserved: padding field. Should be zeroed by applications.
+ * @ref_pic_list0: reference picture list 0 after applying the per-slice modifications.
+ * @ref_pic_list1: reference picture list 1 after applying the per-slice modifications.
+ * @flags: see V4L2_H264_SLICE_FLAG_{}.
+ */
+struct v4l2_ctrl_h264_slice_params {
+	__u32 header_bit_size;
+	__u32 first_mb_in_slice;
+	__u8 slice_type;
+	__u8 colour_plane_id;
+	__u8 redundant_pic_cnt;
+	__u8 cabac_init_idc;
+	__s8 slice_qp_delta;
+	__s8 slice_qs_delta;
+	__u8 disable_deblocking_filter_idc;
+	__s8 slice_alpha_c0_offset_div2;
+	__s8 slice_beta_offset_div2;
+	__u8 num_ref_idx_l0_active_minus1;
+	__u8 num_ref_idx_l1_active_minus1;
+
+	__u8 reserved;
+
+	struct v4l2_h264_reference ref_pic_list0[V4L2_H264_REF_LIST_LEN];
+	struct v4l2_h264_reference ref_pic_list1[V4L2_H264_REF_LIST_LEN];
+
+	__u32 flags;
+};
+
+#define V4L2_H264_DPB_ENTRY_FLAG_VALID		0x01
+#define V4L2_H264_DPB_ENTRY_FLAG_ACTIVE		0x02
+#define V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM	0x04
+#define V4L2_H264_DPB_ENTRY_FLAG_FIELD		0x08
+
+/**
+ * struct v4l2_h264_dpb_entry - H264 decoded picture buffer entry
+ *
+ * @reference_ts: timestamp of the V4L2 capture buffer to use as reference.
+ * The timestamp refers to the timestamp field in struct v4l2_buffer.
+ * Use v4l2_timeval_to_ns() to convert the struct timeval to a __u64.
+ * @pic_num: matches PicNum variable assigned during the reference
+ * picture lists construction process.
+ * @frame_num: frame identifier which matches frame_num syntax element.
+ * @fields: indicates how the DPB entry is referenced. Valid values are
+ * V4L2_H264_{}_REF.
+ * @reserved: padding field. Should be zeroed by applications.
+ * @top_field_order_cnt: matches TopFieldOrderCnt picture value.
+ * @bottom_field_order_cnt: matches BottomFieldOrderCnt picture value.
+ * Note that picture field is indicated by v4l2_buffer.field.
+ * @flags: see V4L2_H264_DPB_ENTRY_FLAG_{}.
+ */
+struct v4l2_h264_dpb_entry {
+	__u64 reference_ts;
+	__u32 pic_num;
+	__u16 frame_num;
+	__u8 fields;
+	__u8 reserved[5];
+	__s32 top_field_order_cnt;
+	__s32 bottom_field_order_cnt;
+	__u32 flags;
+};
+
+#define V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC		0x01
+#define V4L2_H264_DECODE_PARAM_FLAG_FIELD_PIC		0x02
+#define V4L2_H264_DECODE_PARAM_FLAG_BOTTOM_FIELD	0x04
+
+#define V4L2_CID_STATELESS_H264_DECODE_PARAMS	(V4L2_CID_CODEC_STATELESS_BASE + 7)
+/**
+ * struct v4l2_ctrl_h264_decode_params - H264 decoding parameters
+ *
+ * @dpb: decoded picture buffer.
+ * @nal_ref_idc: slice header syntax element.
+ * @frame_num: slice header syntax element.
+ * @top_field_order_cnt: matches TopFieldOrderCnt picture value.
+ * @bottom_field_order_cnt: matches BottomFieldOrderCnt picture value.
+ * Note that picture field is indicated by v4l2_buffer.field.
+ * @idr_pic_id: slice header syntax element.
+ * @pic_order_cnt_lsb: slice header syntax element.
+ * @delta_pic_order_cnt_bottom: slice header syntax element.
+ * @delta_pic_order_cnt0: slice header syntax element.
+ * @delta_pic_order_cnt1: slice header syntax element.
+ * @dec_ref_pic_marking_bit_size: size in bits of dec_ref_pic_marking()
+ * syntax element.
+ * @pic_order_cnt_bit_size: size in bits of pic order count syntax.
+ * @slice_group_change_cycle: slice header syntax element.
+ * @reserved: padding field. Should be zeroed by applications.
+ * @flags: see V4L2_H264_DECODE_PARAM_FLAG_{}.
+ */
+struct v4l2_ctrl_h264_decode_params {
+	struct v4l2_h264_dpb_entry dpb[V4L2_H264_NUM_DPB_ENTRIES];
+	__u16 nal_ref_idc;
+	__u16 frame_num;
+	__s32 top_field_order_cnt;
+	__s32 bottom_field_order_cnt;
+	__u16 idr_pic_id;
+	__u16 pic_order_cnt_lsb;
+	__s32 delta_pic_order_cnt_bottom;
+	__s32 delta_pic_order_cnt0;
+	__s32 delta_pic_order_cnt1;
+	__u32 dec_ref_pic_marking_bit_size;
+	__u32 pic_order_cnt_bit_size;
+	__u32 slice_group_change_cycle;
+
+	__u32 reserved;
+	__u32 flags;
+};
+
+#endif /* _H264_CTRLS_UPSTREAM_H_ */
-- 
2.30.0.617.g56c4b15f3c-goog