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Diffstat (limited to 'include/media/v4l2-h264.h')
| -rw-r--r-- | include/media/v4l2-h264.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/include/media/v4l2-h264.h b/include/media/v4l2-h264.h new file mode 100644 index 000000000..0d9eaa956 --- /dev/null +++ b/include/media/v4l2-h264.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Helper functions for H264 codecs. + * + * Copyright (c) 2019 Collabora, Ltd. + * + * Author: Boris Brezillon <boris.brezillon@collabora.com> + */ + +#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 { + struct { + s32 top_field_order_cnt; + s32 bottom_field_order_cnt; + int frame_num; + u16 longterm : 1; + } refs[V4L2_H264_NUM_DPB_ENTRIES]; + + s32 cur_pic_order_count; + u8 cur_pic_fields; + + struct v4l2_h264_reference unordered_reflist[V4L2_H264_REF_LIST_LEN]; + u8 num_valid; +}; + +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 */ |