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84 lines
2.9 KiB
84 lines
2.9 KiB
/* 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 <[email protected]> |
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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_b_ref_lists() - Build the P reference list |
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* |
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* @builder: reference list builder context |
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* @p_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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