1/* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19/** 20 * @file 21 * H.264 parameter set handling 22 */ 23 24#ifndef AVCODEC_H264_PS_H 25#define AVCODEC_H264_PS_H 26 27#include <stdint.h> 28 29#include "libavutil/buffer.h" 30#include "libavutil/pixfmt.h" 31#include "libavutil/rational.h" 32 33#include "avcodec.h" 34#include "get_bits.h" 35#include "h264.h" 36 37#define MAX_SPS_COUNT 32 38#define MAX_PPS_COUNT 256 39#define MAX_LOG2_MAX_FRAME_NUM (12 + 4) 40 41/** 42 * Sequence parameter set 43 */ 44typedef struct SPS { 45 unsigned int sps_id; 46 int profile_idc; 47 int level_idc; 48 int chroma_format_idc; 49 int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag 50 int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4 51 int poc_type; ///< pic_order_cnt_type 52 int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4 53 int delta_pic_order_always_zero_flag; 54 int offset_for_non_ref_pic; 55 int offset_for_top_to_bottom_field; 56 int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle 57 int ref_frame_count; ///< num_ref_frames 58 int gaps_in_frame_num_allowed_flag; 59 int mb_width; ///< pic_width_in_mbs_minus1 + 1 60 ///< (pic_height_in_map_units_minus1 + 1) * (2 - frame_mbs_only_flag) 61 int mb_height; 62 int frame_mbs_only_flag; 63 int mb_aff; ///< mb_adaptive_frame_field_flag 64 int direct_8x8_inference_flag; 65 int crop; ///< frame_cropping_flag 66 67 /* those 4 are already in luma samples */ 68 unsigned int crop_left; ///< frame_cropping_rect_left_offset 69 unsigned int crop_right; ///< frame_cropping_rect_right_offset 70 unsigned int crop_top; ///< frame_cropping_rect_top_offset 71 unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset 72 int vui_parameters_present_flag; 73 AVRational sar; 74 int video_signal_type_present_flag; 75 int full_range; 76 int colour_description_present_flag; 77 enum AVColorPrimaries color_primaries; 78 enum AVColorTransferCharacteristic color_trc; 79 enum AVColorSpace colorspace; 80 enum AVChromaLocation chroma_location; 81 82 int timing_info_present_flag; 83 uint32_t num_units_in_tick; 84 uint32_t time_scale; 85 int fixed_frame_rate_flag; 86 int32_t offset_for_ref_frame[256]; 87 int bitstream_restriction_flag; 88 int num_reorder_frames; 89 int scaling_matrix_present; 90 uint8_t scaling_matrix4[6][16]; 91 uint8_t scaling_matrix8[6][64]; 92 int nal_hrd_parameters_present_flag; 93 int vcl_hrd_parameters_present_flag; 94 int pic_struct_present_flag; 95 int time_offset_length; 96 int cpb_cnt; ///< See H.264 E.1.2 97 int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1 98 int cpb_removal_delay_length; ///< cpb_removal_delay_length_minus1 + 1 99 int dpb_output_delay_length; ///< dpb_output_delay_length_minus1 + 1 100 int bit_depth_luma; ///< bit_depth_luma_minus8 + 8 101 int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8 102 int residual_color_transform_flag; ///< residual_colour_transform_flag 103 int constraint_set_flags; ///< constraint_set[0-3]_flag 104 uint8_t data[4096]; 105 size_t data_size; 106} SPS; 107 108/** 109 * Picture parameter set 110 */ 111typedef struct PPS { 112 unsigned int sps_id; 113 int cabac; ///< entropy_coding_mode_flag 114 int pic_order_present; ///< pic_order_present_flag 115 int slice_group_count; ///< num_slice_groups_minus1 + 1 116 int mb_slice_group_map_type; 117 unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1 118 int weighted_pred; ///< weighted_pred_flag 119 int weighted_bipred_idc; 120 int init_qp; ///< pic_init_qp_minus26 + 26 121 int init_qs; ///< pic_init_qs_minus26 + 26 122 int chroma_qp_index_offset[2]; 123 int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag 124 int constrained_intra_pred; ///< constrained_intra_pred_flag 125 int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag 126 int transform_8x8_mode; ///< transform_8x8_mode_flag 127 uint8_t scaling_matrix4[6][16]; 128 uint8_t scaling_matrix8[6][64]; 129 uint8_t chroma_qp_table[2][QP_MAX_NUM+1]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table 130 int chroma_qp_diff; 131 uint8_t data[4096]; 132 size_t data_size; 133 134 uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16]; 135 uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64]; 136 uint32_t(*dequant4_coeff[6])[16]; 137 uint32_t(*dequant8_coeff[6])[64]; 138 139 AVBufferRef *sps_ref; 140 const SPS *sps; 141} PPS; 142 143typedef struct H264ParamSets { 144 AVBufferRef *sps_list[MAX_SPS_COUNT]; 145 AVBufferRef *pps_list[MAX_PPS_COUNT]; 146 147 AVBufferRef *pps_ref; 148 /* currently active parameters sets */ 149 const PPS *pps; 150 const SPS *sps; 151 152 int overread_warning_printed[2]; 153} H264ParamSets; 154 155/** 156 * compute profile from sps 157 */ 158int ff_h264_get_profile(const SPS *sps); 159 160/** 161 * Decode SPS 162 */ 163int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, 164 H264ParamSets *ps, int ignore_truncation); 165 166/** 167 * Decode PPS 168 */ 169int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx, 170 H264ParamSets *ps, int bit_length); 171 172/** 173 * Uninit H264 param sets structure. 174 */ 175void ff_h264_ps_uninit(H264ParamSets *ps); 176 177#endif /* AVCODEC_H264_PS_H */ 178