/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Helper functions for H264 codecs. * * Copyright (c) 2019 Collabora, Ltd. * * Author: Boris Brezillon <[email protected]> */ #ifndef _MEDIA_V4L2_H264_H #define _MEDIA_V4L2_H264_H #include <media/v4l2-ctrls.h> /** * struct v4l2_h264_reflist_builder - Reference list builder object * * @refs.top_field_order_cnt: top field order count * @refs.bottom_field_order_cnt: bottom field order count * @refs.frame_num: reference frame number * @refs.longterm: set to true for a long term reference * @refs: array of references * @cur_pic_order_count: picture order count of the frame being decoded * @cur_pic_fields: fields present in the frame being decoded * @unordered_reflist: unordered list of references. Will be used to generate * ordered P/B0/B1 lists * @num_valid: number of valid references in the refs array * * This object stores the context of the P/B0/B1 reference list builder. * This procedure is described in section '8.2.4 Decoding process for reference * picture lists construction' of the H264 spec. */ struct v4l2_h264_reflist_builder { … }; void v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b, const struct v4l2_ctrl_h264_decode_params *dec_params, const struct v4l2_ctrl_h264_sps *sps, const struct v4l2_h264_dpb_entry dpb[V4L2_H264_NUM_DPB_ENTRIES]); /** * v4l2_h264_build_b_ref_lists() - Build the B0/B1 reference lists * * @builder: reference list builder context * @b0_reflist: 32 sized array used to store the B0 reference list. Each entry * is a v4l2_h264_reference structure * @b1_reflist: 32 sized array used to store the B1 reference list. Each entry * is a v4l2_h264_reference structure * * This functions builds the B0/B1 reference lists. This procedure is described * in section '8.2.4 Decoding process for reference picture lists construction' * of the H264 spec. This function can be used by H264 decoder drivers that * need to pass B0/B1 reference lists to the hardware. */ void v4l2_h264_build_b_ref_lists(const struct v4l2_h264_reflist_builder *builder, struct v4l2_h264_reference *b0_reflist, struct v4l2_h264_reference *b1_reflist); /** * v4l2_h264_build_p_ref_list() - Build the P reference list * * @builder: reference list builder context * @reflist: 32 sized array used to store the P reference list. Each entry * is a v4l2_h264_reference structure * * This functions builds the P reference lists. This procedure is describe in * section '8.2.4 Decoding process for reference picture lists construction' * of the H264 spec. This function can be used by H264 decoder drivers that * need to pass a P reference list to the hardware. */ void v4l2_h264_build_p_ref_list(const struct v4l2_h264_reflist_builder *builder, struct v4l2_h264_reference *reflist); #endif /* _MEDIA_V4L2_H264_H */
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