85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Helper functions for H264 codecs.
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*
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* Copyright (c) 2019 Collabora, Ltd.
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*
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* Author: Boris Brezillon <boris.brezillon@collabora.com>
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*/
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#ifndef _MEDIA_V4L2_H264_H
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#define _MEDIA_V4L2_H264_H
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#include <media/v4l2-ctrls.h>
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/**
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* struct v4l2_h264_reflist_builder - Reference list builder object
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*
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* @refs.pic_order_count: reference picture order count
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* @refs.frame_num: reference frame number
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* @refs.pic_num: reference picture number
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* @refs.longterm: set to true for a long term reference
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* @refs: array of references
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* @cur_pic_order_count: picture order count of the frame being decoded
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* @unordered_reflist: unordered list of references. Will be used to generate
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* ordered P/B0/B1 lists
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* @num_valid: number of valid references in the refs array
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*
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* This object stores the context of the P/B0/B1 reference list builder.
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* This procedure is described in section '8.2.4 Decoding process for reference
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* picture lists construction' of the H264 spec.
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*/
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struct v4l2_h264_reflist_builder {
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struct {
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s32 pic_order_count;
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int frame_num;
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u32 pic_num;
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u16 longterm : 1;
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} refs[V4L2_H264_NUM_DPB_ENTRIES];
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s32 cur_pic_order_count;
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u8 unordered_reflist[V4L2_H264_NUM_DPB_ENTRIES];
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u8 num_valid;
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};
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void
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v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
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const struct v4l2_ctrl_h264_decode_params *dec_params,
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const struct v4l2_ctrl_h264_sps *sps,
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const struct v4l2_h264_dpb_entry dpb[V4L2_H264_NUM_DPB_ENTRIES]);
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/**
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* v4l2_h264_build_b_ref_lists() - Build the B0/B1 reference lists
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*
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* @builder: reference list builder context
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* @b0_reflist: 16-bytes array used to store the B0 reference list. Each entry
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* is an index in the DPB
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* @b1_reflist: 16-bytes array used to store the B1 reference list. Each entry
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* is an index in the DPB
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*
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* This functions builds the B0/B1 reference lists. This procedure is described
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* in section '8.2.4 Decoding process for reference picture lists construction'
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* of the H264 spec. This function can be used by H264 decoder drivers that
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* need to pass B0/B1 reference lists to the hardware.
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*/
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void
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v4l2_h264_build_b_ref_lists(const struct v4l2_h264_reflist_builder *builder,
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u8 *b0_reflist, u8 *b1_reflist);
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/**
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* v4l2_h264_build_p_ref_list() - Build the P reference list
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*
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* @builder: reference list builder context
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* @reflist: 16-bytes array used to store the P reference list. Each entry
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* is an index in the DPB
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*
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* This functions builds the P reference lists. This procedure is describe in
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* section '8.2.4 Decoding process for reference picture lists construction'
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* of the H264 spec. This function can be used by H264 decoder drivers that
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* need to pass a P reference list to the hardware.
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*/
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void
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v4l2_h264_build_p_ref_list(const struct v4l2_h264_reflist_builder *builder,
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u8 *reflist);
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#endif /* _MEDIA_V4L2_H264_H */
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