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Make the SEI parsing independent of the H264Context, to allow decoupling the parser from the decoder.
138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_H264_SEI_H
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#define AVCODEC_H264_SEI_H
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#include "get_bits.h"
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/**
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* SEI message types
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*/
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typedef enum {
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SEI_TYPE_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1)
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SEI_TYPE_PIC_TIMING = 1, ///< picture timing
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SEI_TYPE_USER_DATA_REGISTERED = 4, ///< registered user data as specified by Rec. ITU-T T.35
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SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
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SEI_TYPE_RECOVERY_POINT = 6, ///< recovery point (frame # to decoder sync)
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SEI_TYPE_FRAME_PACKING = 45, ///< frame packing arrangement
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SEI_TYPE_DISPLAY_ORIENTATION = 47, ///< display orientation
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} SEI_Type;
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/**
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* pic_struct in picture timing SEI message
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*/
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typedef enum {
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SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame
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SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field
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SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field
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SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order
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SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order
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SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order
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SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order
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SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling
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SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling
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} SEI_PicStructType;
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typedef struct H264SEIPictureTiming {
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SEI_PicStructType pic_struct;
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/**
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* Bit set of clock types for fields/frames in picture timing SEI message.
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* For each found ct_type, appropriate bit is set (e.g., bit 1 for
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* interlaced).
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*/
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int ct_type;
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/**
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* dpb_output_delay in picture timing SEI message, see H.264 C.2.2
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*/
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int dpb_output_delay;
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/**
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* cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
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*/
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int cpb_removal_delay;
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} H264SEIPictureTiming;
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typedef struct H264SEIAFD {
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int present;
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uint8_t active_format_description;
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} H264SEIAFD;
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typedef struct H264SEIA53Caption {
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int a53_caption_size;
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uint8_t *a53_caption;
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} H264SEIA53Caption;
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typedef struct H264SEIUnregistered {
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int x264_build;
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} H264SEIUnregistered;
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typedef struct H264SEIRecoveryPoint {
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/**
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* recovery_frame_cnt
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*
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* Set to -1 if no recovery point SEI message found or to number of frames
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* before playback synchronizes. Frames having recovery point are key
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* frames.
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*/
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int recovery_frame_cnt;
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} H264SEIRecoveryPoint;
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typedef struct H264SEIBufferingPeriod {
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int present; ///< Buffering period SEI flag
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int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs
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} H264SEIBufferingPeriod;
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typedef struct H264SEIFramePacking {
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int present;
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int arrangement_type;
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int content_interpretation_type;
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int quincunx_subsampling;
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} H264SEIFramePacking;
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typedef struct H264SEIDisplayOrientation {
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int present;
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int anticlockwise_rotation;
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int hflip, vflip;
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} H264SEIDisplayOrientation;
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typedef struct H264SEIContext {
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H264SEIPictureTiming picture_timing;
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H264SEIAFD afd;
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H264SEIA53Caption a53_caption;
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H264SEIUnregistered unregistered;
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H264SEIRecoveryPoint recovery_point;
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H264SEIBufferingPeriod buffering_period;
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H264SEIFramePacking frame_packing;
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H264SEIDisplayOrientation display_orientation;
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} H264SEIContext;
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struct H264ParamSets;
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int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
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const struct H264ParamSets *ps, void *logctx);
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/**
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* Reset SEI values at the beginning of the frame.
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*/
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void ff_h264_sei_uninit(H264SEIContext *h);
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#endif /* AVCODEC_H264_SEI_H */
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