mirror of
https://github.com/FFmpeg/FFmpeg.git
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169 lines
6.0 KiB
C
169 lines
6.0 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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/**
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* @file
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* H.264 parameter set handling
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*/
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#ifndef AVCODEC_H264_PS_H
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#define AVCODEC_H264_PS_H
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#include <stdint.h>
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#include "libavutil/buffer.h"
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#include "libavutil/pixfmt.h"
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#include "libavutil/rational.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "h264.h"
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#define MAX_SPS_COUNT 32
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#define MAX_PPS_COUNT 256
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#define MAX_LOG2_MAX_FRAME_NUM (12 + 4)
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/**
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* Sequence parameter set
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*/
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typedef struct SPS {
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unsigned int sps_id;
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int profile_idc;
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int level_idc;
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int chroma_format_idc;
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int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag
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int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4
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int poc_type; ///< pic_order_cnt_type
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int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4
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int delta_pic_order_always_zero_flag;
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int offset_for_non_ref_pic;
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int offset_for_top_to_bottom_field;
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int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle
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int ref_frame_count; ///< num_ref_frames
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int gaps_in_frame_num_allowed_flag;
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int mb_width; ///< pic_width_in_mbs_minus1 + 1
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///< (pic_height_in_map_units_minus1 + 1) * (2 - frame_mbs_only_flag)
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int mb_height;
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int frame_mbs_only_flag;
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int mb_aff; ///< mb_adaptive_frame_field_flag
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int direct_8x8_inference_flag;
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int crop; ///< frame_cropping_flag
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/* those 4 are already in luma samples */
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unsigned int crop_left; ///< frame_cropping_rect_left_offset
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unsigned int crop_right; ///< frame_cropping_rect_right_offset
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unsigned int crop_top; ///< frame_cropping_rect_top_offset
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unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset
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int vui_parameters_present_flag;
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AVRational sar;
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int video_signal_type_present_flag;
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int full_range;
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int colour_description_present_flag;
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enum AVColorPrimaries color_primaries;
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enum AVColorTransferCharacteristic color_trc;
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enum AVColorSpace colorspace;
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int timing_info_present_flag;
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uint32_t num_units_in_tick;
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uint32_t time_scale;
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int fixed_frame_rate_flag;
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int32_t offset_for_ref_frame[256];
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int bitstream_restriction_flag;
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int num_reorder_frames;
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int scaling_matrix_present;
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uint8_t scaling_matrix4[6][16];
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uint8_t scaling_matrix8[6][64];
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int nal_hrd_parameters_present_flag;
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int vcl_hrd_parameters_present_flag;
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int pic_struct_present_flag;
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int time_offset_length;
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int cpb_cnt; ///< See H.264 E.1.2
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int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1
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int cpb_removal_delay_length; ///< cpb_removal_delay_length_minus1 + 1
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int dpb_output_delay_length; ///< dpb_output_delay_length_minus1 + 1
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int bit_depth_luma; ///< bit_depth_luma_minus8 + 8
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int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8
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int residual_color_transform_flag; ///< residual_colour_transform_flag
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int constraint_set_flags; ///< constraint_set[0-3]_flag
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uint8_t data[4096];
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size_t data_size;
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} SPS;
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/**
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* Picture parameter set
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*/
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typedef struct PPS {
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unsigned int sps_id;
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int cabac; ///< entropy_coding_mode_flag
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int pic_order_present; ///< pic_order_present_flag
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int slice_group_count; ///< num_slice_groups_minus1 + 1
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int mb_slice_group_map_type;
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unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1
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int weighted_pred; ///< weighted_pred_flag
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int weighted_bipred_idc;
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int init_qp; ///< pic_init_qp_minus26 + 26
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int init_qs; ///< pic_init_qs_minus26 + 26
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int chroma_qp_index_offset[2];
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int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
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int constrained_intra_pred; ///< constrained_intra_pred_flag
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int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
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int transform_8x8_mode; ///< transform_8x8_mode_flag
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uint8_t scaling_matrix4[6][16];
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uint8_t scaling_matrix8[6][64];
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uint8_t chroma_qp_table[2][QP_MAX_NUM+1]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
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int chroma_qp_diff;
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uint8_t data[4096];
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size_t data_size;
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uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16];
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uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64];
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uint32_t(*dequant4_coeff[6])[16];
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uint32_t(*dequant8_coeff[6])[64];
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} PPS;
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typedef struct H264ParamSets {
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AVBufferRef *sps_list[MAX_SPS_COUNT];
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AVBufferRef *pps_list[MAX_PPS_COUNT];
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AVBufferRef *pps_ref;
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AVBufferRef *sps_ref;
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/* currently active parameters sets */
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const PPS *pps;
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const SPS *sps;
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int overread_warning_printed[2];
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} H264ParamSets;
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/**
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* Decode SPS
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*/
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int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
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H264ParamSets *ps, int ignore_truncation);
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/**
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* Decode PPS
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*/
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int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
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H264ParamSets *ps, int bit_length);
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/**
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* Uninit H264 param sets structure.
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*/
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void ff_h264_ps_uninit(H264ParamSets *ps);
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#endif /* AVCODEC_H264_PS_H */
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