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ec7f33a38e
Those SEIs refer to the currently active SPS. However, since the SEI NALUs precede the coded picture data in the bitstream, the active SPS is in general not known when we are decoding the SEI. Therefore, store the content of the picture timing SEIs and actually parse it when the active SPS is known.
217 lines
7.0 KiB
C
217 lines
7.0 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "h264_ps.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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H264_SEI_TYPE_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1)
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H264_SEI_TYPE_PIC_TIMING = 1, ///< picture timing
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H264_SEI_TYPE_PAN_SCAN_RECT = 2, ///< pan-scan rectangle
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H264_SEI_TYPE_FILLER_PAYLOAD = 3, ///< filler data
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H264_SEI_TYPE_USER_DATA_REGISTERED = 4, ///< registered user data as specified by Rec. ITU-T T.35
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H264_SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
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H264_SEI_TYPE_RECOVERY_POINT = 6, ///< recovery point (frame # to decoder sync)
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H264_SEI_TYPE_FRAME_PACKING = 45, ///< frame packing arrangement
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H264_SEI_TYPE_DISPLAY_ORIENTATION = 47, ///< display orientation
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H264_SEI_TYPE_GREEN_METADATA = 56, ///< GreenMPEG information
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H264_SEI_TYPE_MASTERING_DISPLAY_COLOUR_VOLUME = 137, ///< mastering display properties
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H264_SEI_TYPE_ALTERNATIVE_TRANSFER = 147, ///< alternative transfer
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} H264_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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H264_SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame
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H264_SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field
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H264_SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field
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H264_SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order
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H264_SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order
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H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order
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H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order
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H264_SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling
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H264_SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling
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} H264_SEI_PicStructType;
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/**
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* frame_packing_arrangement types
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*/
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typedef enum {
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H264_SEI_FPA_TYPE_CHECKERBOARD = 0,
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H264_SEI_FPA_TYPE_INTERLEAVE_COLUMN = 1,
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H264_SEI_FPA_TYPE_INTERLEAVE_ROW = 2,
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H264_SEI_FPA_TYPE_SIDE_BY_SIDE = 3,
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H264_SEI_FPA_TYPE_TOP_BOTTOM = 4,
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H264_SEI_FPA_TYPE_INTERLEAVE_TEMPORAL = 5,
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H264_SEI_FPA_TYPE_2D = 6,
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} H264_SEI_FpaType;
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typedef struct H264SEITimeCode {
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/* When not continuously receiving full timecodes, we have to reference
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the previous timecode received */
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int full;
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int frame;
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int seconds;
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int minutes;
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int hours;
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int dropframe;
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} H264SEITimeCode;
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typedef struct H264SEIPictureTiming {
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// maximum size of pic_timing according to the spec should be 274 bits
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uint8_t payload[40];
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int payload_size_bits;
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int present;
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H264_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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/**
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* Maximum three timecodes in a pic_timing SEI.
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*/
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H264SEITimeCode timecode[3];
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/**
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* Number of timecode in use
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*/
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int timecode_cnt;
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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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AVBufferRef *buf_ref;
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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_id;
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int arrangement_cancel_flag; ///< is previous arrangement canceled, -1 if never received
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H264_SEI_FpaType arrangement_type;
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int arrangement_repetition_period;
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int content_interpretation_type;
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int quincunx_sampling_flag;
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int current_frame_is_frame0_flag;
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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 H264SEIGreenMetaData {
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uint8_t green_metadata_type;
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uint8_t period_type;
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uint16_t num_seconds;
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uint16_t num_pictures;
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uint8_t percent_non_zero_macroblocks;
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uint8_t percent_intra_coded_macroblocks;
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uint8_t percent_six_tap_filtering;
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uint8_t percent_alpha_point_deblocking_instance;
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uint8_t xsd_metric_type;
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uint16_t xsd_metric_value;
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} H264SEIGreenMetaData;
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typedef struct H264SEIAlternativeTransfer {
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int present;
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int preferred_transfer_characteristics;
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} H264SEIAlternativeTransfer;
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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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H264SEIGreenMetaData green_metadata;
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H264SEIAlternativeTransfer alternative_transfer;
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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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/**
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* Get stereo_mode string from the h264 frame_packing_arrangement
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*/
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const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h);
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/**
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* Parse the contents of a picture timing message given an active SPS.
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*/
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int ff_h264_sei_process_picture_timing(H264SEIPictureTiming *h, const SPS *sps,
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void *logctx);
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#endif /* AVCODEC_H264_SEI_H */
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