libavcodec/cbs_h264.h

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef AVCODEC_CBS_H264_H
  20 #define AVCODEC_CBS_H264_H
  21
  22 #include <stddef.h>
  23 #include <stdint.h>
  24
  25 #include "cbs_h2645.h"
  26 #include "h264.h"
  27
  28
  29 enum {
  30     // This limit is arbitrary - it is sufficient for one message of each
  31     // type plus some repeats, and will therefore easily cover all sane
  32     // streams.  However, it is possible to make technically-valid streams
  33     // for which it will fail (for example, by including a large number of
  34     // user-data-unregistered messages).
  35     H264_MAX_SEI_PAYLOADS = 64,
  36 };
  37
  38
  39 typedef struct H264RawNALUnitHeader {
  40     uint8_t forbidden_zero_bit;
  41     uint8_t nal_ref_idc;
  42     uint8_t nal_unit_type;
  43
  44     uint8_t svc_extension_flag;
  45     uint8_t avc_3d_extension_flag;
  46 } H264RawNALUnitHeader;
  47
  48 typedef struct H264RawScalingList {
  49     int8_t delta_scale[64];
  50 } H264RawScalingList;
  51
  52 typedef struct H264RawHRD {
  53     uint8_t cpb_cnt_minus1;
  54     uint8_t bit_rate_scale;
  55     uint8_t cpb_size_scale;
  56
  57     uint32_t bit_rate_value_minus1[H264_MAX_CPB_CNT];
  58     uint32_t cpb_size_value_minus1[H264_MAX_CPB_CNT];
  59     uint8_t cbr_flag[H264_MAX_CPB_CNT];
  60
  61     uint8_t initial_cpb_removal_delay_length_minus1;
  62     uint8_t cpb_removal_delay_length_minus1;
  63     uint8_t dpb_output_delay_length_minus1;
  64     uint8_t time_offset_length;
  65 } H264RawHRD;
  66
  67 typedef struct H264RawVUI {
  68     uint8_t aspect_ratio_info_present_flag;
  69     uint8_t aspect_ratio_idc;
  70     uint16_t sar_width;
  71     uint16_t sar_height;
  72
  73     uint8_t overscan_info_present_flag;
  74     uint8_t overscan_appropriate_flag;
  75
  76     uint8_t video_signal_type_present_flag;
  77     uint8_t video_format;
  78     uint8_t video_full_range_flag;
  79     uint8_t colour_description_present_flag;
  80     uint8_t colour_primaries;
  81     uint8_t transfer_characteristics;
  82     uint8_t matrix_coefficients;
  83
  84     uint8_t chroma_loc_info_present_flag;
  85     uint8_t chroma_sample_loc_type_top_field;
  86     uint8_t chroma_sample_loc_type_bottom_field;
  87
  88     uint8_t timing_info_present_flag;
  89     uint32_t num_units_in_tick;
  90     uint32_t time_scale;
  91     uint8_t fixed_frame_rate_flag;
  92
  93     uint8_t nal_hrd_parameters_present_flag;
  94     H264RawHRD nal_hrd_parameters;
  95     uint8_t vcl_hrd_parameters_present_flag;
  96     H264RawHRD vcl_hrd_parameters;
  97     uint8_t low_delay_hrd_flag;
  98
  99     uint8_t pic_struct_present_flag;
 100
 101     uint8_t bitstream_restriction_flag;
 102     uint8_t motion_vectors_over_pic_boundaries_flag;
 103     uint8_t max_bytes_per_pic_denom;
 104     uint8_t max_bits_per_mb_denom;
 105     uint8_t log2_max_mv_length_horizontal;
 106     uint8_t log2_max_mv_length_vertical;
 107     uint8_t max_num_reorder_frames;
 108     uint8_t max_dec_frame_buffering;
 109 } H264RawVUI;
 110
 111 typedef struct H264RawSPS {
 112     H264RawNALUnitHeader nal_unit_header;
 113
 114     uint8_t profile_idc;
 115     uint8_t constraint_set0_flag;
 116     uint8_t constraint_set1_flag;
 117     uint8_t constraint_set2_flag;
 118     uint8_t constraint_set3_flag;
 119     uint8_t constraint_set4_flag;
 120     uint8_t constraint_set5_flag;
 121     uint8_t reserved_zero_2bits;
 122     uint8_t level_idc;
 123
 124     uint8_t seq_parameter_set_id;
 125
 126     uint8_t chroma_format_idc;
 127     uint8_t separate_colour_plane_flag;
 128     uint8_t bit_depth_luma_minus8;
 129     uint8_t bit_depth_chroma_minus8;
 130     uint8_t qpprime_y_zero_transform_bypass_flag;
 131
 132     uint8_t seq_scaling_matrix_present_flag;
 133     uint8_t seq_scaling_list_present_flag[12];
 134     H264RawScalingList scaling_list_4x4[6];
 135     H264RawScalingList scaling_list_8x8[6];
 136
 137     uint8_t log2_max_frame_num_minus4;
 138     uint8_t pic_order_cnt_type;
 139     uint8_t log2_max_pic_order_cnt_lsb_minus4;
 140     uint8_t delta_pic_order_always_zero_flag;
 141     int32_t offset_for_non_ref_pic;
 142     int32_t offset_for_top_to_bottom_field;
 143     uint8_t num_ref_frames_in_pic_order_cnt_cycle;
 144     int32_t offset_for_ref_frame[256];
 145
 146     uint8_t max_num_ref_frames;
 147     uint8_t gaps_in_frame_num_allowed_flag;
 148
 149     uint16_t pic_width_in_mbs_minus1;
 150     uint16_t pic_height_in_map_units_minus1;
 151
 152     uint8_t frame_mbs_only_flag;
 153     uint8_t mb_adaptive_frame_field_flag;
 154     uint8_t direct_8x8_inference_flag;
 155
 156     uint8_t frame_cropping_flag;
 157     uint16_t frame_crop_left_offset;
 158     uint16_t frame_crop_right_offset;
 159     uint16_t frame_crop_top_offset;
 160     uint16_t frame_crop_bottom_offset;
 161
 162     uint8_t vui_parameters_present_flag;
 163     H264RawVUI vui;
 164 } H264RawSPS;
 165
 166 typedef struct H264RawSPSExtension {
 167     H264RawNALUnitHeader nal_unit_header;
 168
 169     uint8_t seq_parameter_set_id;
 170
 171     uint8_t aux_format_idc;
 172     uint8_t bit_depth_aux_minus8;
 173     uint8_t alpha_incr_flag;
 174     uint16_t alpha_opaque_value;
 175     uint16_t alpha_transparent_value;
 176
 177     uint8_t additional_extension_flag;
 178 } H264RawSPSExtension;
 179
 180 typedef struct H264RawPPS {
 181     H264RawNALUnitHeader nal_unit_header;
 182
 183     uint8_t pic_parameter_set_id;
 184     uint8_t seq_parameter_set_id;
 185
 186     uint8_t entropy_coding_mode_flag;
 187     uint8_t bottom_field_pic_order_in_frame_present_flag;
 188
 189     uint8_t num_slice_groups_minus1;
 190     uint8_t slice_group_map_type;
 191     uint16_t run_length_minus1[H264_MAX_SLICE_GROUPS];
 192     uint16_t top_left[H264_MAX_SLICE_GROUPS];
 193     uint16_t bottom_right[H264_MAX_SLICE_GROUPS];
 194     uint8_t slice_group_change_direction_flag;
 195     uint16_t slice_group_change_rate_minus1;
 196     uint16_t pic_size_in_map_units_minus1;
 197     uint8_t slice_group_id[H264_MAX_MB_PIC_SIZE];
 198
 199     uint8_t num_ref_idx_l0_default_active_minus1;
 200     uint8_t num_ref_idx_l1_default_active_minus1;
 201
 202     uint8_t weighted_pred_flag;
 203     uint8_t weighted_bipred_idc;
 204
 205     int8_t pic_init_qp_minus26;
 206     int8_t pic_init_qs_minus26;
 207     int8_t chroma_qp_index_offset;
 208
 209     uint8_t deblocking_filter_control_present_flag;
 210     uint8_t constrained_intra_pred_flag;
 211
 212     uint8_t more_rbsp_data;
 213
 214     uint8_t redundant_pic_cnt_present_flag;
 215     uint8_t transform_8x8_mode_flag;
 216
 217     uint8_t pic_scaling_matrix_present_flag;
 218     uint8_t pic_scaling_list_present_flag[12];
 219     H264RawScalingList scaling_list_4x4[6];
 220     H264RawScalingList scaling_list_8x8[6];
 221
 222     int8_t second_chroma_qp_index_offset;
 223 } H264RawPPS;
 224
 225 typedef struct H264RawAUD {
 226     H264RawNALUnitHeader nal_unit_header;
 227
 228     uint8_t primary_pic_type;
 229 } H264RawAUD;
 230
 231 typedef struct H264RawSEIBufferingPeriod {
 232     uint8_t seq_parameter_set_id;
 233     struct {
 234         uint32_t initial_cpb_removal_delay[H264_MAX_CPB_CNT];
 235         uint32_t initial_cpb_removal_delay_offset[H264_MAX_CPB_CNT];
 236     } nal, vcl;
 237 } H264RawSEIBufferingPeriod;
 238
 239 typedef struct H264RawSEIPicTimestamp {
 240     uint8_t ct_type;
 241     uint8_t nuit_field_based_flag;
 242     uint8_t counting_type;
 243     uint8_t full_timestamp_flag;
 244     uint8_t discontinuity_flag;
 245     uint8_t cnt_dropped_flag;
 246     uint8_t n_frames;
 247     uint8_t seconds_flag;
 248     uint8_t seconds_value;
 249     uint8_t minutes_flag;
 250     uint8_t minutes_value;
 251     uint8_t hours_flag;
 252     uint8_t hours_value;
 253     uint32_t time_offset;
 254 } H264RawSEIPicTimestamp;
 255
 256 typedef struct H264RawSEIPicTiming {
 257     uint32_t cpb_removal_delay;
 258     uint32_t dpb_output_delay;
 259     uint8_t pic_struct;
 260     uint8_t clock_timestamp_flag[3];
 261     H264RawSEIPicTimestamp timestamp[3];
 262 } H264RawSEIPicTiming;
 263
 264 typedef struct H264RawSEIUserDataRegistered {
 265     uint8_t itu_t_t35_country_code;
 266     uint8_t itu_t_t35_country_code_extension_byte;
 267     uint8_t *data;
 268     size_t data_length;
 269     AVBufferRef *data_ref;
 270 } H264RawSEIUserDataRegistered;
 271
 272 typedef struct H264RawSEIUserDataUnregistered {
 273     uint8_t uuid_iso_iec_11578[16];
 274     uint8_t *data;
 275     size_t data_length;
 276     AVBufferRef *data_ref;
 277 } H264RawSEIUserDataUnregistered;
 278
 279 typedef struct H264RawSEIRecoveryPoint {
 280     uint16_t recovery_frame_cnt;
 281     uint8_t exact_match_flag;
 282     uint8_t broken_link_flag;
 283     uint8_t changing_slice_group_idc;
 284 } H264RawSEIRecoveryPoint;
 285
 286 typedef struct H264RawSEIDisplayOrientation {
 287     uint8_t display_orientation_cancel_flag;
 288     uint8_t hor_flip;
 289     uint8_t ver_flip;
 290     uint16_t anticlockwise_rotation;
 291     uint16_t display_orientation_repetition_period;
 292     uint8_t display_orientation_extension_flag;
 293 } H264RawSEIDisplayOrientation;
 294
 295 typedef struct H264RawSEIPayload {
 296     uint32_t payload_type;
 297     uint32_t payload_size;
 298     union {
 299         H264RawSEIBufferingPeriod buffering_period;
 300         H264RawSEIPicTiming pic_timing;
 301         // H264RawSEIFiller filler -> no fields.
 302         H264RawSEIUserDataRegistered user_data_registered;
 303         H264RawSEIUserDataUnregistered user_data_unregistered;
 304         H264RawSEIRecoveryPoint recovery_point;
 305         H264RawSEIDisplayOrientation display_orientation;
 306         struct {
 307             uint8_t *data;
 308             size_t data_length;
 309             AVBufferRef *data_ref;
 310         } other;
 311     } payload;
 312 } H264RawSEIPayload;
 313
 314 typedef struct H264RawSEI {
 315     H264RawNALUnitHeader nal_unit_header;
 316
 317     H264RawSEIPayload payload[H264_MAX_SEI_PAYLOADS];
 318     uint8_t payload_count;
 319 } H264RawSEI;
 320
 321 typedef struct H264RawSliceHeader {
 322     H264RawNALUnitHeader nal_unit_header;
 323
 324     uint32_t first_mb_in_slice;
 325     uint8_t slice_type;
 326
 327     uint8_t pic_parameter_set_id;
 328
 329     uint8_t colour_plane_id;
 330
 331     uint16_t frame_num;
 332     uint8_t field_pic_flag;
 333     uint8_t bottom_field_flag;
 334
 335     uint16_t idr_pic_id;
 336
 337     uint16_t pic_order_cnt_lsb;
 338     int32_t delta_pic_order_cnt_bottom;
 339     int32_t delta_pic_order_cnt[2];
 340
 341     uint8_t redundant_pic_cnt;
 342     uint8_t direct_spatial_mv_pred_flag;
 343
 344     uint8_t num_ref_idx_active_override_flag;
 345     uint8_t num_ref_idx_l0_active_minus1;
 346     uint8_t num_ref_idx_l1_active_minus1;
 347
 348     uint8_t ref_pic_list_modification_flag_l0;
 349     uint8_t ref_pic_list_modification_flag_l1;
 350     struct {
 351         uint8_t modification_of_pic_nums_idc;
 352         int32_t abs_diff_pic_num_minus1;
 353         uint8_t long_term_pic_num;
 354     } rplm_l0[H264_MAX_RPLM_COUNT], rplm_l1[H264_MAX_RPLM_COUNT];
 355
 356     uint8_t luma_log2_weight_denom;
 357     uint8_t chroma_log2_weight_denom;
 358
 359     uint8_t luma_weight_l0_flag[H264_MAX_REFS];
 360     int8_t luma_weight_l0[H264_MAX_REFS];
 361     int8_t luma_offset_l0[H264_MAX_REFS];
 362     uint8_t chroma_weight_l0_flag[H264_MAX_REFS];
 363     int8_t chroma_weight_l0[H264_MAX_REFS][2];
 364     int8_t chroma_offset_l0[H264_MAX_REFS][2];
 365
 366     uint8_t luma_weight_l1_flag[H264_MAX_REFS];
 367     int8_t luma_weight_l1[H264_MAX_REFS];
 368     int8_t luma_offset_l1[H264_MAX_REFS];
 369     uint8_t chroma_weight_l1_flag[H264_MAX_REFS];
 370     int8_t chroma_weight_l1[H264_MAX_REFS][2];
 371     int8_t chroma_offset_l1[H264_MAX_REFS][2];
 372
 373     uint8_t no_output_of_prior_pics_flag;
 374     uint8_t long_term_reference_flag;
 375
 376     uint8_t adaptive_ref_pic_marking_mode_flag;
 377     struct {
 378         uint8_t memory_management_control_operation;
 379         int32_t difference_of_pic_nums_minus1;
 380         uint8_t long_term_pic_num;
 381         uint8_t long_term_frame_idx;
 382         uint8_t max_long_term_frame_idx_plus1;
 383     } mmco[H264_MAX_MMCO_COUNT];
 384
 385     uint8_t cabac_init_idc;
 386
 387     int8_t slice_qp_delta;
 388
 389     uint8_t sp_for_switch_flag;
 390     int8_t slice_qs_delta;
 391
 392     uint8_t disable_deblocking_filter_idc;
 393     int8_t slice_alpha_c0_offset_div2;
 394     int8_t slice_beta_offset_div2;
 395
 396     uint16_t slice_group_change_cycle;
 397 } H264RawSliceHeader;
 398
 399 typedef struct H264RawSlice {
 400     H264RawSliceHeader header;
 401
 402     uint8_t *data;
 403     size_t   data_size;
 404     int      data_bit_start;
 405     AVBufferRef *data_ref;
 406 } H264RawSlice;
 407
 408
 409 typedef struct CodedBitstreamH264Context {
 410     // Reader/writer context in common with the H.265 implementation.
 411     CodedBitstreamH2645Context common;
 412
 413     // All currently available parameter sets.  These are updated when
 414     // any parameter set NAL unit is read/written with this context.
 415     H264RawSPS *sps[H264_MAX_SPS_COUNT];
 416     H264RawPPS *pps[H264_MAX_PPS_COUNT];
 417
 418     // The currently active parameter sets.  These are updated when any
 419     // NAL unit refers to the relevant parameter set.  These pointers
 420     // must also be present in the arrays above.
 421     const H264RawSPS *active_sps;
 422     const H264RawPPS *active_pps;
 423
 424     // The NAL unit type of the most recent normal slice.  This is required
 425     // to be able to read/write auxiliary slices, because IdrPicFlag is
 426     // otherwise unknown.
 427     uint8_t last_slice_nal_unit_type;
 428 } CodedBitstreamH264Context;
 429
 430
 431 #endif /* AVCODEC_CBS_H264_H */