From 728d90a0c1973661a9e73da697bf4f90c9d19577 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Tue, 22 Mar 2016 13:31:21 +0100 Subject: h264: decouple h264_sei from the h264 decoder Make the SEI parsing independent of the H264Context, to allow decoupling the parser from the decoder. --- libavcodec/h264_sei.h | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 libavcodec/h264_sei.h (limited to 'libavcodec/h264_sei.h') diff --git a/libavcodec/h264_sei.h b/libavcodec/h264_sei.h new file mode 100644 index 0000000000..58f5ecc5a9 --- /dev/null +++ b/libavcodec/h264_sei.h @@ -0,0 +1,137 @@ +/* + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_H264_SEI_H +#define AVCODEC_H264_SEI_H + +#include "get_bits.h" + +/** + * SEI message types + */ +typedef enum { + SEI_TYPE_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1) + SEI_TYPE_PIC_TIMING = 1, ///< picture timing + SEI_TYPE_USER_DATA_REGISTERED = 4, ///< registered user data as specified by Rec. ITU-T T.35 + SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data + SEI_TYPE_RECOVERY_POINT = 6, ///< recovery point (frame # to decoder sync) + SEI_TYPE_FRAME_PACKING = 45, ///< frame packing arrangement + SEI_TYPE_DISPLAY_ORIENTATION = 47, ///< display orientation +} SEI_Type; + +/** + * pic_struct in picture timing SEI message + */ +typedef enum { + SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame + SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field + SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field + SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order + SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order + SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order + SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order + SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling + SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling +} SEI_PicStructType; + +typedef struct H264SEIPictureTiming { + SEI_PicStructType pic_struct; + + /** + * Bit set of clock types for fields/frames in picture timing SEI message. + * For each found ct_type, appropriate bit is set (e.g., bit 1 for + * interlaced). + */ + int ct_type; + + /** + * dpb_output_delay in picture timing SEI message, see H.264 C.2.2 + */ + int dpb_output_delay; + + /** + * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2 + */ + int cpb_removal_delay; +} H264SEIPictureTiming; + +typedef struct H264SEIAFD { + int present; + uint8_t active_format_description; +} H264SEIAFD; + +typedef struct H264SEIA53Caption { + int a53_caption_size; + uint8_t *a53_caption; +} H264SEIA53Caption; + +typedef struct H264SEIUnregistered { + int x264_build; +} H264SEIUnregistered; + +typedef struct H264SEIRecoveryPoint { + /** + * recovery_frame_cnt + * + * Set to -1 if no recovery point SEI message found or to number of frames + * before playback synchronizes. Frames having recovery point are key + * frames. + */ + int recovery_frame_cnt; +} H264SEIRecoveryPoint; + +typedef struct H264SEIBufferingPeriod { + int present; ///< Buffering period SEI flag + int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs +} H264SEIBufferingPeriod; + +typedef struct H264SEIFramePacking { + int present; + int arrangement_type; + int content_interpretation_type; + int quincunx_subsampling; +} H264SEIFramePacking; + +typedef struct H264SEIDisplayOrientation { + int present; + int anticlockwise_rotation; + int hflip, vflip; +} H264SEIDisplayOrientation; + +typedef struct H264SEIContext { + H264SEIPictureTiming picture_timing; + H264SEIAFD afd; + H264SEIA53Caption a53_caption; + H264SEIUnregistered unregistered; + H264SEIRecoveryPoint recovery_point; + H264SEIBufferingPeriod buffering_period; + H264SEIFramePacking frame_packing; + H264SEIDisplayOrientation display_orientation; +} H264SEIContext; + +struct H264ParamSets; + +int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb, + const struct H264ParamSets *ps, void *logctx); + +/** + * Reset SEI values at the beginning of the frame. + */ +void ff_h264_sei_uninit(H264SEIContext *h); + +#endif /* AVCODEC_H264_SEI_H */ -- cgit v1.2.3