2 * This file is part of FFmpeg.
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.
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.
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
21 * H.264 parameter set handling
24 #ifndef AVCODEC_H264_PS_H
25 #define AVCODEC_H264_PS_H
29 #include "libavutil/buffer.h"
30 #include "libavutil/pixfmt.h"
31 #include "libavutil/rational.h"
37 #define MAX_SPS_COUNT 32
38 #define MAX_PPS_COUNT 256
39 #define MAX_LOG2_MAX_FRAME_NUM (12 + 4)
42 * Sequence parameter set
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)
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
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;
74 int video_signal_type_present_flag;
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;
82 int timing_info_present_flag;
83 uint32_t num_units_in_tick;
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
109 * Picture parameter set
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
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];
139 AVBufferRef *sps_ref;
143 typedef struct H264ParamSets {
144 AVBufferRef *sps_list[MAX_SPS_COUNT];
145 AVBufferRef *pps_list[MAX_PPS_COUNT];
147 AVBufferRef *pps_ref;
148 /* currently active parameters sets */
152 int overread_warning_printed[2];
158 int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
159 H264ParamSets *ps, int ignore_truncation);
164 int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
165 H264ParamSets *ps, int bit_length);
168 * Uninit H264 param sets structure.
170 void ff_h264_ps_uninit(H264ParamSets *ps);
172 #endif /* AVCODEC_H264_PS_H */