libavcodec/hevc_ps.h

   1 /*
   2  * HEVC parameter set parsing
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVCODEC_HEVC_PS_H
  22 #define AVCODEC_HEVC_PS_H
  23
  24 #include <stdint.h>
  25
  26 #include "libavutil/buffer.h"
  27 #include "libavutil/pixfmt.h"
  28 #include "libavutil/rational.h"
  29
  30 #include "avcodec.h"
  31 #include "get_bits.h"
  32 #include "hevc.h"
  33
  34 typedef struct ShortTermRPS {
  35     unsigned int num_negative_pics;
  36     int num_delta_pocs;
  37     int rps_idx_num_delta_pocs;
  38     int32_t delta_poc[32];
  39     uint8_t used[32];
  40 } ShortTermRPS;
  41
  42 typedef struct HEVCWindow {
  43     unsigned int left_offset;
  44     unsigned int right_offset;
  45     unsigned int top_offset;
  46     unsigned int bottom_offset;
  47 } HEVCWindow;
  48
  49 typedef struct VUI {
  50     AVRational sar;
  51
  52     int overscan_info_present_flag;
  53     int overscan_appropriate_flag;
  54
  55     int video_signal_type_present_flag;
  56     int video_format;
  57     int video_full_range_flag;
  58     int colour_description_present_flag;
  59     uint8_t colour_primaries;
  60     uint8_t transfer_characteristic;
  61     uint8_t matrix_coeffs;
  62
  63     int chroma_loc_info_present_flag;
  64     int chroma_sample_loc_type_top_field;
  65     int chroma_sample_loc_type_bottom_field;
  66     int neutra_chroma_indication_flag;
  67
  68     int field_seq_flag;
  69     int frame_field_info_present_flag;
  70
  71     int default_display_window_flag;
  72     HEVCWindow def_disp_win;
  73
  74     int vui_timing_info_present_flag;
  75     uint32_t vui_num_units_in_tick;
  76     uint32_t vui_time_scale;
  77     int vui_poc_proportional_to_timing_flag;
  78     int vui_num_ticks_poc_diff_one_minus1;
  79     int vui_hrd_parameters_present_flag;
  80
  81     int bitstream_restriction_flag;
  82     int tiles_fixed_structure_flag;
  83     int motion_vectors_over_pic_boundaries_flag;
  84     int restricted_ref_pic_lists_flag;
  85     int min_spatial_segmentation_idc;
  86     int max_bytes_per_pic_denom;
  87     int max_bits_per_min_cu_denom;
  88     int log2_max_mv_length_horizontal;
  89     int log2_max_mv_length_vertical;
  90 } VUI;
  91
  92 typedef struct PTLCommon {
  93     uint8_t profile_space;
  94     uint8_t tier_flag;
  95     uint8_t profile_idc;
  96     uint8_t profile_compatibility_flag[32];
  97     uint8_t level_idc;
  98     uint8_t progressive_source_flag;
  99     uint8_t interlaced_source_flag;
 100     uint8_t non_packed_constraint_flag;
 101     uint8_t frame_only_constraint_flag;
 102 } PTLCommon;
 103
 104 typedef struct PTL {
 105     PTLCommon general_ptl;
 106     PTLCommon sub_layer_ptl[HEVC_MAX_SUB_LAYERS];
 107
 108     uint8_t sub_layer_profile_present_flag[HEVC_MAX_SUB_LAYERS];
 109     uint8_t sub_layer_level_present_flag[HEVC_MAX_SUB_LAYERS];
 110 } PTL;
 111
 112 typedef struct HEVCVPS {
 113     uint8_t vps_temporal_id_nesting_flag;
 114     int vps_max_layers;
 115     int vps_max_sub_layers; ///< vps_max_temporal_layers_minus1 + 1
 116
 117     PTL ptl;
 118     int vps_sub_layer_ordering_info_present_flag;
 119     unsigned int vps_max_dec_pic_buffering[HEVC_MAX_SUB_LAYERS];
 120     unsigned int vps_num_reorder_pics[HEVC_MAX_SUB_LAYERS];
 121     unsigned int vps_max_latency_increase[HEVC_MAX_SUB_LAYERS];
 122     int vps_max_layer_id;
 123     int vps_num_layer_sets; ///< vps_num_layer_sets_minus1 + 1
 124     uint8_t vps_timing_info_present_flag;
 125     uint32_t vps_num_units_in_tick;
 126     uint32_t vps_time_scale;
 127     uint8_t vps_poc_proportional_to_timing_flag;
 128     int vps_num_ticks_poc_diff_one; ///< vps_num_ticks_poc_diff_one_minus1 + 1
 129     int vps_num_hrd_parameters;
 130 } HEVCVPS;
 131
 132 typedef struct ScalingList {
 133     /* This is a little wasteful, since sizeID 0 only needs 8 coeffs,
 134      * and size ID 3 only has 2 arrays, not 6. */
 135     uint8_t sl[4][6][64];
 136     uint8_t sl_dc[2][6];
 137 } ScalingList;
 138
 139 typedef struct HEVCSPS {
 140     int vps_id;
 141     int chroma_format_idc;
 142     uint8_t separate_colour_plane_flag;
 143
 144     HEVCWindow output_window;
 145
 146     HEVCWindow pic_conf_win;
 147
 148     int bit_depth;
 149     int pixel_shift;
 150     enum AVPixelFormat pix_fmt;
 151
 152     unsigned int log2_max_poc_lsb;
 153     int pcm_enabled_flag;
 154
 155     int max_sub_layers;
 156     struct {
 157         int max_dec_pic_buffering;
 158         int num_reorder_pics;
 159         int max_latency_increase;
 160     } temporal_layer[HEVC_MAX_SUB_LAYERS];
 161
 162     VUI vui;
 163     PTL ptl;
 164
 165     uint8_t scaling_list_enable_flag;
 166     ScalingList scaling_list;
 167
 168     unsigned int nb_st_rps;
 169     ShortTermRPS st_rps[HEVC_MAX_SHORT_TERM_REF_PIC_SETS];
 170
 171     uint8_t amp_enabled_flag;
 172     uint8_t sao_enabled;
 173
 174     uint8_t long_term_ref_pics_present_flag;
 175     uint16_t lt_ref_pic_poc_lsb_sps[HEVC_MAX_LONG_TERM_REF_PICS];
 176     uint8_t used_by_curr_pic_lt_sps_flag[HEVC_MAX_LONG_TERM_REF_PICS];
 177     uint8_t num_long_term_ref_pics_sps;
 178
 179     struct {
 180         uint8_t bit_depth;
 181         uint8_t bit_depth_chroma;
 182         unsigned int log2_min_pcm_cb_size;
 183         unsigned int log2_max_pcm_cb_size;
 184         uint8_t loop_filter_disable_flag;
 185     } pcm;
 186     uint8_t sps_temporal_mvp_enabled_flag;
 187     uint8_t sps_strong_intra_smoothing_enable_flag;
 188
 189     unsigned int log2_min_cb_size;
 190     unsigned int log2_diff_max_min_coding_block_size;
 191     unsigned int log2_min_tb_size;
 192     unsigned int log2_max_trafo_size;
 193     unsigned int log2_ctb_size;
 194     unsigned int log2_min_pu_size;
 195
 196     int max_transform_hierarchy_depth_inter;
 197     int max_transform_hierarchy_depth_intra;
 198
 199     ///< coded frame dimension in various units
 200     int width;
 201     int height;
 202     int ctb_width;
 203     int ctb_height;
 204     int ctb_size;
 205     int min_cb_width;
 206     int min_cb_height;
 207     int min_tb_width;
 208     int min_tb_height;
 209     int min_pu_width;
 210     int min_pu_height;
 211
 212     int hshift[3];
 213     int vshift[3];
 214
 215     int qp_bd_offset;
 216 } HEVCSPS;
 217
 218 typedef struct HEVCPPS {
 219     unsigned int sps_id; ///< seq_parameter_set_id
 220
 221     uint8_t sign_data_hiding_flag;
 222
 223     uint8_t cabac_init_present_flag;
 224
 225     int num_ref_idx_l0_default_active; ///< num_ref_idx_l0_default_active_minus1 + 1
 226     int num_ref_idx_l1_default_active; ///< num_ref_idx_l1_default_active_minus1 + 1
 227     int pic_init_qp_minus26;
 228
 229     uint8_t constrained_intra_pred_flag;
 230     uint8_t transform_skip_enabled_flag;
 231
 232     uint8_t cu_qp_delta_enabled_flag;
 233     int diff_cu_qp_delta_depth;
 234
 235     int cb_qp_offset;
 236     int cr_qp_offset;
 237     uint8_t pic_slice_level_chroma_qp_offsets_present_flag;
 238     uint8_t weighted_pred_flag;
 239     uint8_t weighted_bipred_flag;
 240     uint8_t output_flag_present_flag;
 241     uint8_t transquant_bypass_enable_flag;
 242
 243     uint8_t dependent_slice_segments_enabled_flag;
 244     uint8_t tiles_enabled_flag;
 245     uint8_t entropy_coding_sync_enabled_flag;
 246
 247     int num_tile_columns;   ///< num_tile_columns_minus1 + 1
 248     int num_tile_rows;      ///< num_tile_rows_minus1 + 1
 249     uint8_t uniform_spacing_flag;
 250     uint8_t loop_filter_across_tiles_enabled_flag;
 251
 252     uint8_t seq_loop_filter_across_slices_enabled_flag;
 253
 254     uint8_t deblocking_filter_control_present_flag;
 255     uint8_t deblocking_filter_override_enabled_flag;
 256     uint8_t disable_dbf;
 257     int beta_offset;    ///< beta_offset_div2 * 2
 258     int tc_offset;      ///< tc_offset_div2 * 2
 259
 260     uint8_t scaling_list_data_present_flag;
 261     ScalingList scaling_list;
 262
 263     uint8_t lists_modification_present_flag;
 264     int log2_parallel_merge_level; ///< log2_parallel_merge_level_minus2 + 2
 265     int num_extra_slice_header_bits;
 266     uint8_t slice_header_extension_present_flag;
 267
 268     // Inferred parameters
 269     unsigned int *column_width;  ///< ColumnWidth
 270     unsigned int *row_height;    ///< RowHeight
 271     unsigned int *col_bd;        ///< ColBd
 272     unsigned int *row_bd;        ///< RowBd
 273     int *col_idxX;
 274
 275     int *ctb_addr_rs_to_ts; ///< CtbAddrRSToTS
 276     int *ctb_addr_ts_to_rs; ///< CtbAddrTSToRS
 277     int *tile_id;           ///< TileId
 278     int *tile_pos_rs;       ///< TilePosRS
 279     int *min_tb_addr_zs;    ///< MinTbAddrZS
 280 } HEVCPPS;
 281
 282 typedef struct HEVCParamSets {
 283     AVBufferRef *vps_list[HEVC_MAX_VPS_COUNT];
 284     AVBufferRef *sps_list[HEVC_MAX_SPS_COUNT];
 285     AVBufferRef *pps_list[HEVC_MAX_PPS_COUNT];
 286
 287     /* currently active parameter sets */
 288     const HEVCVPS *vps;
 289     const HEVCSPS *sps;
 290     const HEVCPPS *pps;
 291 } HEVCParamSets;
 292
 293 /**
 294  * Parse the SPS from the bitstream into the provided HEVCSPS struct.
 295  *
 296  * @param sps_id the SPS id will be written here
 297  * @param apply_defdispwin if set 1, the default display window from the VUI
 298  *                         will be applied to the video dimensions
 299  * @param vps_list if non-NULL, this function will validate that the SPS refers
 300  *                 to an existing VPS
 301  */
 302 int ff_hevc_parse_sps(HEVCSPS *sps, GetBitContext *gb, unsigned int *sps_id,
 303                       int apply_defdispwin, AVBufferRef **vps_list, AVCodecContext *avctx);
 304
 305 int ff_hevc_decode_nal_vps(GetBitContext *gb, AVCodecContext *avctx,
 306                            HEVCParamSets *ps);
 307 int ff_hevc_decode_nal_sps(GetBitContext *gb, AVCodecContext *avctx,
 308                            HEVCParamSets *ps, int apply_defdispwin);
 309 int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx,
 310                            HEVCParamSets *ps);
 311
 312 int ff_hevc_decode_short_term_rps(GetBitContext *gb, AVCodecContext *avctx,
 313                                   ShortTermRPS *rps, const HEVCSPS *sps, int is_slice_header);
 314
 315 int ff_hevc_encode_nal_vps(HEVCVPS *vps, unsigned int id,
 316                            uint8_t *buf, int buf_size);
 317
 318 #endif /* AVCODEC_HEVC_PS_H */