drivers/media/platform/allegro-dvt/nal-hevc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019-2020 Pengutronix, Michael Tretter <kernel@pengutronix.de>
   4  *
   5  * Convert NAL units between raw byte sequence payloads (RBSP) and C structs.
   6  *
   7  * The conversion is defined in "ITU-T Rec. H.265 (02/2018) high efficiency
   8  * video coding". Decoder drivers may use the parser to parse RBSP from
   9  * encoded streams and configure the hardware, if the hardware is not able to
  10  * parse RBSP itself. Encoder drivers may use the generator to generate the
  11  * RBSP for VPS/SPS/PPS nal units and add them to the encoded stream if the
  12  * hardware does not generate the units.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/string.h>
  18 #include <linux/v4l2-controls.h>
  19
  20 #include <linux/device.h>
  21 #include <linux/export.h>
  22 #include <linux/log2.h>
  23
  24 #include "nal-hevc.h"
  25 #include "nal-rbsp.h"
  26
  27 /*
  28  * See Rec. ITU-T H.265 (02/2018) Table 7-1 - NAL unit type codes and NAL unit
  29  * type classes
  30  */
  31 enum nal_unit_type {
  32         VPS_NUT = 32,
  33         SPS_NUT = 33,
  34         PPS_NUT = 34,
  35         FD_NUT = 38,
  36 };
  37
  38 static void nal_hevc_write_start_code_prefix(struct rbsp *rbsp)
  39 {
  40         u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8);
  41         int i = 4;
  42
  43         if (DIV_ROUND_UP(rbsp->pos, 8) + i > rbsp->size) {
  44                 rbsp->error = -EINVAL;
  45                 return;
  46         }
  47
  48         p[0] = 0x00;
  49         p[1] = 0x00;
  50         p[2] = 0x00;
  51         p[3] = 0x01;
  52
  53         rbsp->pos += i * 8;
  54 }
  55
  56 static void nal_hevc_read_start_code_prefix(struct rbsp *rbsp)
  57 {
  58         u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8);
  59         int i = 4;
  60
  61         if (DIV_ROUND_UP(rbsp->pos, 8) + i > rbsp->size) {
  62                 rbsp->error = -EINVAL;
  63                 return;
  64         }
  65
  66         if (p[0] != 0x00 || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0x01) {
  67                 rbsp->error = -EINVAL;
  68                 return;
  69         }
  70
  71         rbsp->pos += i * 8;
  72 }
  73
  74 static void nal_hevc_write_filler_data(struct rbsp *rbsp)
  75 {
  76         u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8);
  77         int i;
  78
  79         /* Keep 1 byte extra for terminating the NAL unit */
  80         i = rbsp->size - DIV_ROUND_UP(rbsp->pos, 8) - 1;
  81         memset(p, 0xff, i);
  82         rbsp->pos += i * 8;
  83 }
  84
  85 static void nal_hevc_read_filler_data(struct rbsp *rbsp)
  86 {
  87         u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8);
  88
  89         while (*p == 0xff) {
  90                 if (DIV_ROUND_UP(rbsp->pos, 8) > rbsp->size) {
  91                         rbsp->error = -EINVAL;
  92                         return;
  93                 }
  94
  95                 p++;
  96                 rbsp->pos += 8;
  97         }
  98 }
  99
 100 static void nal_hevc_rbsp_profile_tier_level(struct rbsp *rbsp,
 101                                              struct nal_hevc_profile_tier_level *ptl)
 102 {
 103         unsigned int i;
 104         unsigned int max_num_sub_layers_minus_1 = 0;
 105
 106         rbsp_bits(rbsp, 2, &ptl->general_profile_space);
 107         rbsp_bit(rbsp, &ptl->general_tier_flag);
 108         rbsp_bits(rbsp, 5, &ptl->general_profile_idc);
 109         for (i = 0; i < 32; i++)
 110                 rbsp_bit(rbsp, &ptl->general_profile_compatibility_flag[i]);
 111         rbsp_bit(rbsp, &ptl->general_progressive_source_flag);
 112         rbsp_bit(rbsp, &ptl->general_interlaced_source_flag);
 113         rbsp_bit(rbsp, &ptl->general_non_packed_constraint_flag);
 114         rbsp_bit(rbsp, &ptl->general_frame_only_constraint_flag);
 115         if (ptl->general_profile_idc == 4 ||
 116             ptl->general_profile_compatibility_flag[4] ||
 117             ptl->general_profile_idc == 5 ||
 118             ptl->general_profile_compatibility_flag[5] ||
 119             ptl->general_profile_idc == 6 ||
 120             ptl->general_profile_compatibility_flag[6] ||
 121             ptl->general_profile_idc == 7 ||
 122             ptl->general_profile_compatibility_flag[7] ||
 123             ptl->general_profile_idc == 8 ||
 124             ptl->general_profile_compatibility_flag[8] ||
 125             ptl->general_profile_idc == 9 ||
 126             ptl->general_profile_compatibility_flag[9] ||
 127             ptl->general_profile_idc == 10 ||
 128             ptl->general_profile_compatibility_flag[10]) {
 129                 rbsp_bit(rbsp, &ptl->general_max_12bit_constraint_flag);
 130                 rbsp_bit(rbsp, &ptl->general_max_10bit_constraint_flag);
 131                 rbsp_bit(rbsp, &ptl->general_max_8bit_constraint_flag);
 132                 rbsp_bit(rbsp, &ptl->general_max_422chroma_constraint_flag);
 133                 rbsp_bit(rbsp, &ptl->general_max_420chroma_constraint_flag);
 134                 rbsp_bit(rbsp, &ptl->general_max_monochrome_constraint_flag);
 135                 rbsp_bit(rbsp, &ptl->general_intra_constraint_flag);
 136                 rbsp_bit(rbsp, &ptl->general_one_picture_only_constraint_flag);
 137                 rbsp_bit(rbsp, &ptl->general_lower_bit_rate_constraint_flag);
 138                 if (ptl->general_profile_idc == 5 ||
 139                     ptl->general_profile_compatibility_flag[5] ||
 140                     ptl->general_profile_idc == 9 ||
 141                     ptl->general_profile_compatibility_flag[9] ||
 142                     ptl->general_profile_idc == 10 ||
 143                     ptl->general_profile_compatibility_flag[10]) {
 144                         rbsp_bit(rbsp, &ptl->general_max_14bit_constraint_flag);
 145                         rbsp_bits(rbsp, 32, &ptl->general_reserved_zero_33bits);
 146                         rbsp_bits(rbsp, 33 - 32, &ptl->general_reserved_zero_33bits);
 147                 } else {
 148                         rbsp_bits(rbsp, 32, &ptl->general_reserved_zero_34bits);
 149                         rbsp_bits(rbsp, 34 - 2, &ptl->general_reserved_zero_34bits);
 150                 }
 151         } else if (ptl->general_profile_idc == 2 ||
 152                    ptl->general_profile_compatibility_flag[2]) {
 153                 rbsp_bits(rbsp, 7, &ptl->general_reserved_zero_7bits);
 154                 rbsp_bit(rbsp, &ptl->general_one_picture_only_constraint_flag);
 155                 rbsp_bits(rbsp, 32, &ptl->general_reserved_zero_35bits);
 156                 rbsp_bits(rbsp, 35 - 32, &ptl->general_reserved_zero_35bits);
 157         } else {
 158                 rbsp_bits(rbsp, 32, &ptl->general_reserved_zero_43bits);
 159                 rbsp_bits(rbsp, 43 - 32, &ptl->general_reserved_zero_43bits);
 160         }
 161         if ((ptl->general_profile_idc >= 1 && ptl->general_profile_idc <= 5) ||
 162             ptl->general_profile_idc == 9 ||
 163             ptl->general_profile_compatibility_flag[1] ||
 164             ptl->general_profile_compatibility_flag[2] ||
 165             ptl->general_profile_compatibility_flag[3] ||
 166             ptl->general_profile_compatibility_flag[4] ||
 167             ptl->general_profile_compatibility_flag[5] ||
 168             ptl->general_profile_compatibility_flag[9])
 169                 rbsp_bit(rbsp, &ptl->general_inbld_flag);
 170         else
 171                 rbsp_bit(rbsp, &ptl->general_reserved_zero_bit);
 172         rbsp_bits(rbsp, 8, &ptl->general_level_idc);
 173         if (max_num_sub_layers_minus_1 > 0)
 174                 rbsp_unsupported(rbsp);
 175 }
 176
 177 static void nal_hevc_rbsp_vps(struct rbsp *rbsp, struct nal_hevc_vps *vps)
 178 {
 179         unsigned int i, j;
 180         unsigned int reserved_0xffff_16bits = 0xffff;
 181
 182         rbsp_bits(rbsp, 4, &vps->video_parameter_set_id);
 183         rbsp_bit(rbsp, &vps->base_layer_internal_flag);
 184         rbsp_bit(rbsp, &vps->base_layer_available_flag);
 185         rbsp_bits(rbsp, 6, &vps->max_layers_minus1);
 186         rbsp_bits(rbsp, 3, &vps->max_sub_layers_minus1);
 187         rbsp_bits(rbsp, 1, &vps->temporal_id_nesting_flag);
 188         rbsp_bits(rbsp, 16, &reserved_0xffff_16bits);
 189         nal_hevc_rbsp_profile_tier_level(rbsp, &vps->profile_tier_level);
 190         rbsp_bit(rbsp, &vps->sub_layer_ordering_info_present_flag);
 191         for (i = vps->sub_layer_ordering_info_present_flag ? 0 : vps->max_sub_layers_minus1;
 192              i <= vps->max_sub_layers_minus1; i++) {
 193                 rbsp_uev(rbsp, &vps->max_dec_pic_buffering_minus1[i]);
 194                 rbsp_uev(rbsp, &vps->max_num_reorder_pics[i]);
 195                 rbsp_uev(rbsp, &vps->max_latency_increase_plus1[i]);
 196         }
 197         rbsp_bits(rbsp, 6, &vps->max_layer_id);
 198         rbsp_uev(rbsp, &vps->num_layer_sets_minus1);
 199         for (i = 0; i <= vps->num_layer_sets_minus1; i++)
 200                 for (j = 0; j <= vps->max_layer_id; j++)
 201                         rbsp_bit(rbsp, &vps->layer_id_included_flag[i][j]);
 202         rbsp_bit(rbsp, &vps->timing_info_present_flag);
 203         if (vps->timing_info_present_flag)
 204                 rbsp_unsupported(rbsp);
 205         rbsp_bit(rbsp, &vps->extension_flag);
 206         if (vps->extension_flag)
 207                 rbsp_unsupported(rbsp);
 208 }
 209
 210 static void nal_hevc_rbsp_sub_layer_hrd_parameters(struct rbsp *rbsp,
 211                                                    struct nal_hevc_sub_layer_hrd_parameters *hrd)
 212 {
 213         unsigned int i;
 214         unsigned int cpb_cnt = 1;
 215
 216         for (i = 0; i < cpb_cnt; i++) {
 217                 rbsp_uev(rbsp, &hrd->bit_rate_value_minus1[i]);
 218                 rbsp_uev(rbsp, &hrd->cpb_size_value_minus1[i]);
 219                 rbsp_bit(rbsp, &hrd->cbr_flag[i]);
 220         }
 221 }
 222
 223 static void nal_hevc_rbsp_hrd_parameters(struct rbsp *rbsp,
 224                                          struct nal_hevc_hrd_parameters *hrd)
 225 {
 226         unsigned int i;
 227         unsigned int max_num_sub_layers_minus_1 = 0;
 228
 229         rbsp_bit(rbsp, &hrd->nal_hrd_parameters_present_flag);
 230         rbsp_bit(rbsp, &hrd->vcl_hrd_parameters_present_flag);
 231         if (hrd->nal_hrd_parameters_present_flag || hrd->vcl_hrd_parameters_present_flag) {
 232                 rbsp_bit(rbsp, &hrd->sub_pic_hrd_params_present_flag);
 233                 if (hrd->sub_pic_hrd_params_present_flag) {
 234                         rbsp_bits(rbsp, 8, &hrd->tick_divisor_minus2);
 235                         rbsp_bits(rbsp, 5, &hrd->du_cpb_removal_delay_increment_length_minus1);
 236                         rbsp_bit(rbsp, &hrd->sub_pic_cpb_params_in_pic_timing_sei_flag);
 237                         rbsp_bits(rbsp, 5, &hrd->dpb_output_delay_du_length_minus1);
 238                 }
 239                 rbsp_bits(rbsp, 4, &hrd->bit_rate_scale);
 240                 rbsp_bits(rbsp, 4, &hrd->cpb_size_scale);
 241                 if (hrd->sub_pic_hrd_params_present_flag)
 242                         rbsp_bits(rbsp, 4, &hrd->cpb_size_du_scale);
 243                 rbsp_bits(rbsp, 5, &hrd->initial_cpb_removal_delay_length_minus1);
 244                 rbsp_bits(rbsp, 5, &hrd->au_cpb_removal_delay_length_minus1);
 245                 rbsp_bits(rbsp, 5, &hrd->dpb_output_delay_length_minus1);
 246         }
 247         for (i = 0; i <= max_num_sub_layers_minus_1; i++) {
 248                 rbsp_bit(rbsp, &hrd->fixed_pic_rate_general_flag[i]);
 249                 if (!hrd->fixed_pic_rate_general_flag[i])
 250                         rbsp_bit(rbsp, &hrd->fixed_pic_rate_within_cvs_flag[i]);
 251                 if (hrd->fixed_pic_rate_within_cvs_flag[i])
 252                         rbsp_uev(rbsp, &hrd->elemental_duration_in_tc_minus1[i]);
 253                 else
 254                         rbsp_bit(rbsp, &hrd->low_delay_hrd_flag[i]);
 255                 if (!hrd->low_delay_hrd_flag[i])
 256                         rbsp_uev(rbsp, &hrd->cpb_cnt_minus1[i]);
 257                 if (hrd->nal_hrd_parameters_present_flag)
 258                         nal_hevc_rbsp_sub_layer_hrd_parameters(rbsp, &hrd->vcl_hrd[i]);
 259                 if (hrd->vcl_hrd_parameters_present_flag)
 260                         nal_hevc_rbsp_sub_layer_hrd_parameters(rbsp, &hrd->vcl_hrd[i]);
 261         }
 262 }
 263
 264 static void nal_hevc_rbsp_vui_parameters(struct rbsp *rbsp,
 265                                          struct nal_hevc_vui_parameters *vui)
 266 {
 267         if (!vui) {
 268                 rbsp->error = -EINVAL;
 269                 return;
 270         }
 271
 272         rbsp_bit(rbsp, &vui->aspect_ratio_info_present_flag);
 273         if (vui->aspect_ratio_info_present_flag) {
 274                 rbsp_bits(rbsp, 8, &vui->aspect_ratio_idc);
 275                 if (vui->aspect_ratio_idc == 255) {
 276                         rbsp_bits(rbsp, 16, &vui->sar_width);
 277                         rbsp_bits(rbsp, 16, &vui->sar_height);
 278                 }
 279         }
 280
 281         rbsp_bit(rbsp, &vui->overscan_info_present_flag);
 282         if (vui->overscan_info_present_flag)
 283                 rbsp_bit(rbsp, &vui->overscan_appropriate_flag);
 284
 285         rbsp_bit(rbsp, &vui->video_signal_type_present_flag);
 286         if (vui->video_signal_type_present_flag) {
 287                 rbsp_bits(rbsp, 3, &vui->video_format);
 288                 rbsp_bit(rbsp, &vui->video_full_range_flag);
 289
 290                 rbsp_bit(rbsp, &vui->colour_description_present_flag);
 291                 if (vui->colour_description_present_flag) {
 292                         rbsp_bits(rbsp, 8, &vui->colour_primaries);
 293                         rbsp_bits(rbsp, 8, &vui->transfer_characteristics);
 294                         rbsp_bits(rbsp, 8, &vui->matrix_coeffs);
 295                 }
 296         }
 297
 298         rbsp_bit(rbsp, &vui->chroma_loc_info_present_flag);
 299         if (vui->chroma_loc_info_present_flag) {
 300                 rbsp_uev(rbsp, &vui->chroma_sample_loc_type_top_field);
 301                 rbsp_uev(rbsp, &vui->chroma_sample_loc_type_bottom_field);
 302         }
 303
 304         rbsp_bit(rbsp, &vui->neutral_chroma_indication_flag);
 305         rbsp_bit(rbsp, &vui->field_seq_flag);
 306         rbsp_bit(rbsp, &vui->frame_field_info_present_flag);
 307         rbsp_bit(rbsp, &vui->default_display_window_flag);
 308         if (vui->default_display_window_flag) {
 309                 rbsp_uev(rbsp, &vui->def_disp_win_left_offset);
 310                 rbsp_uev(rbsp, &vui->def_disp_win_right_offset);
 311                 rbsp_uev(rbsp, &vui->def_disp_win_top_offset);
 312                 rbsp_uev(rbsp, &vui->def_disp_win_bottom_offset);
 313         }
 314
 315         rbsp_bit(rbsp, &vui->vui_timing_info_present_flag);
 316         if (vui->vui_timing_info_present_flag) {
 317                 rbsp_bits(rbsp, 32, &vui->vui_num_units_in_tick);
 318                 rbsp_bits(rbsp, 32, &vui->vui_time_scale);
 319                 rbsp_bit(rbsp, &vui->vui_poc_proportional_to_timing_flag);
 320                 if (vui->vui_poc_proportional_to_timing_flag)
 321                         rbsp_uev(rbsp, &vui->vui_num_ticks_poc_diff_one_minus1);
 322                 rbsp_bit(rbsp, &vui->vui_hrd_parameters_present_flag);
 323                 if (vui->vui_hrd_parameters_present_flag)
 324                         nal_hevc_rbsp_hrd_parameters(rbsp, &vui->nal_hrd_parameters);
 325         }
 326
 327         rbsp_bit(rbsp, &vui->bitstream_restriction_flag);
 328         if (vui->bitstream_restriction_flag) {
 329                 rbsp_bit(rbsp, &vui->tiles_fixed_structure_flag);
 330                 rbsp_bit(rbsp, &vui->motion_vectors_over_pic_boundaries_flag);
 331                 rbsp_bit(rbsp, &vui->restricted_ref_pic_lists_flag);
 332                 rbsp_uev(rbsp, &vui->min_spatial_segmentation_idc);
 333                 rbsp_uev(rbsp, &vui->max_bytes_per_pic_denom);
 334                 rbsp_uev(rbsp, &vui->max_bits_per_min_cu_denom);
 335                 rbsp_uev(rbsp, &vui->log2_max_mv_length_horizontal);
 336                 rbsp_uev(rbsp, &vui->log2_max_mv_length_vertical);
 337         }
 338 }
 339
 340 static void nal_hevc_rbsp_sps(struct rbsp *rbsp, struct nal_hevc_sps *sps)
 341 {
 342         unsigned int i;
 343
 344         rbsp_bits(rbsp, 4, &sps->video_parameter_set_id);
 345         rbsp_bits(rbsp, 3, &sps->max_sub_layers_minus1);
 346         rbsp_bit(rbsp, &sps->temporal_id_nesting_flag);
 347         nal_hevc_rbsp_profile_tier_level(rbsp, &sps->profile_tier_level);
 348         rbsp_uev(rbsp, &sps->seq_parameter_set_id);
 349
 350         rbsp_uev(rbsp, &sps->chroma_format_idc);
 351         if (sps->chroma_format_idc == 3)
 352                 rbsp_bit(rbsp, &sps->separate_colour_plane_flag);
 353         rbsp_uev(rbsp, &sps->pic_width_in_luma_samples);
 354         rbsp_uev(rbsp, &sps->pic_height_in_luma_samples);
 355         rbsp_bit(rbsp, &sps->conformance_window_flag);
 356         if (sps->conformance_window_flag) {
 357                 rbsp_uev(rbsp, &sps->conf_win_left_offset);
 358                 rbsp_uev(rbsp, &sps->conf_win_right_offset);
 359                 rbsp_uev(rbsp, &sps->conf_win_top_offset);
 360                 rbsp_uev(rbsp, &sps->conf_win_bottom_offset);
 361         }
 362         rbsp_uev(rbsp, &sps->bit_depth_luma_minus8);
 363         rbsp_uev(rbsp, &sps->bit_depth_chroma_minus8);
 364
 365         rbsp_uev(rbsp, &sps->log2_max_pic_order_cnt_lsb_minus4);
 366
 367         rbsp_bit(rbsp, &sps->sub_layer_ordering_info_present_flag);
 368         for (i = (sps->sub_layer_ordering_info_present_flag ? 0 : sps->max_sub_layers_minus1);
 369              i <= sps->max_sub_layers_minus1; i++) {
 370                 rbsp_uev(rbsp, &sps->max_dec_pic_buffering_minus1[i]);
 371                 rbsp_uev(rbsp, &sps->max_num_reorder_pics[i]);
 372                 rbsp_uev(rbsp, &sps->max_latency_increase_plus1[i]);
 373         }
 374         rbsp_uev(rbsp, &sps->log2_min_luma_coding_block_size_minus3);
 375         rbsp_uev(rbsp, &sps->log2_diff_max_min_luma_coding_block_size);
 376         rbsp_uev(rbsp, &sps->log2_min_luma_transform_block_size_minus2);
 377         rbsp_uev(rbsp, &sps->log2_diff_max_min_luma_transform_block_size);
 378         rbsp_uev(rbsp, &sps->max_transform_hierarchy_depth_inter);
 379         rbsp_uev(rbsp, &sps->max_transform_hierarchy_depth_intra);
 380
 381         rbsp_bit(rbsp, &sps->scaling_list_enabled_flag);
 382         if (sps->scaling_list_enabled_flag)
 383                 rbsp_unsupported(rbsp);
 384
 385         rbsp_bit(rbsp, &sps->amp_enabled_flag);
 386         rbsp_bit(rbsp, &sps->sample_adaptive_offset_enabled_flag);
 387         rbsp_bit(rbsp, &sps->pcm_enabled_flag);
 388         if (sps->pcm_enabled_flag) {
 389                 rbsp_bits(rbsp, 4, &sps->pcm_sample_bit_depth_luma_minus1);
 390                 rbsp_bits(rbsp, 4, &sps->pcm_sample_bit_depth_chroma_minus1);
 391                 rbsp_uev(rbsp, &sps->log2_min_pcm_luma_coding_block_size_minus3);
 392                 rbsp_uev(rbsp, &sps->log2_diff_max_min_pcm_luma_coding_block_size);
 393                 rbsp_bit(rbsp, &sps->pcm_loop_filter_disabled_flag);
 394         }
 395
 396         rbsp_uev(rbsp, &sps->num_short_term_ref_pic_sets);
 397         if (sps->num_short_term_ref_pic_sets > 0)
 398                 rbsp_unsupported(rbsp);
 399
 400         rbsp_bit(rbsp, &sps->long_term_ref_pics_present_flag);
 401         if (sps->long_term_ref_pics_present_flag)
 402                 rbsp_unsupported(rbsp);
 403
 404         rbsp_bit(rbsp, &sps->sps_temporal_mvp_enabled_flag);
 405         rbsp_bit(rbsp, &sps->strong_intra_smoothing_enabled_flag);
 406         rbsp_bit(rbsp, &sps->vui_parameters_present_flag);
 407         if (sps->vui_parameters_present_flag)
 408                 nal_hevc_rbsp_vui_parameters(rbsp, &sps->vui);
 409
 410         rbsp_bit(rbsp, &sps->extension_present_flag);
 411         if (sps->extension_present_flag) {
 412                 rbsp_bit(rbsp, &sps->sps_range_extension_flag);
 413                 rbsp_bit(rbsp, &sps->sps_multilayer_extension_flag);
 414                 rbsp_bit(rbsp, &sps->sps_3d_extension_flag);
 415                 rbsp_bit(rbsp, &sps->sps_scc_extension_flag);
 416                 rbsp_bits(rbsp, 5, &sps->sps_extension_4bits);
 417         }
 418         if (sps->sps_range_extension_flag)
 419                 rbsp_unsupported(rbsp);
 420         if (sps->sps_multilayer_extension_flag)
 421                 rbsp_unsupported(rbsp);
 422         if (sps->sps_3d_extension_flag)
 423                 rbsp_unsupported(rbsp);
 424         if (sps->sps_scc_extension_flag)
 425                 rbsp_unsupported(rbsp);
 426         if (sps->sps_extension_4bits)
 427                 rbsp_unsupported(rbsp);
 428 }
 429
 430 static void nal_hevc_rbsp_pps(struct rbsp *rbsp, struct nal_hevc_pps *pps)
 431 {
 432         unsigned int i;
 433
 434         rbsp_uev(rbsp, &pps->pps_pic_parameter_set_id);
 435         rbsp_uev(rbsp, &pps->pps_seq_parameter_set_id);
 436         rbsp_bit(rbsp, &pps->dependent_slice_segments_enabled_flag);
 437         rbsp_bit(rbsp, &pps->output_flag_present_flag);
 438         rbsp_bits(rbsp, 3, &pps->num_extra_slice_header_bits);
 439         rbsp_bit(rbsp, &pps->sign_data_hiding_enabled_flag);
 440         rbsp_bit(rbsp, &pps->cabac_init_present_flag);
 441         rbsp_uev(rbsp, &pps->num_ref_idx_l0_default_active_minus1);
 442         rbsp_uev(rbsp, &pps->num_ref_idx_l1_default_active_minus1);
 443         rbsp_sev(rbsp, &pps->init_qp_minus26);
 444         rbsp_bit(rbsp, &pps->constrained_intra_pred_flag);
 445         rbsp_bit(rbsp, &pps->transform_skip_enabled_flag);
 446         rbsp_bit(rbsp, &pps->cu_qp_delta_enabled_flag);
 447         if (pps->cu_qp_delta_enabled_flag)
 448                 rbsp_uev(rbsp, &pps->diff_cu_qp_delta_depth);
 449         rbsp_sev(rbsp, &pps->pps_cb_qp_offset);
 450         rbsp_sev(rbsp, &pps->pps_cr_qp_offset);
 451         rbsp_bit(rbsp, &pps->pps_slice_chroma_qp_offsets_present_flag);
 452         rbsp_bit(rbsp, &pps->weighted_pred_flag);
 453         rbsp_bit(rbsp, &pps->weighted_bipred_flag);
 454         rbsp_bit(rbsp, &pps->transquant_bypass_enabled_flag);
 455         rbsp_bit(rbsp, &pps->tiles_enabled_flag);
 456         rbsp_bit(rbsp, &pps->entropy_coding_sync_enabled_flag);
 457         if (pps->tiles_enabled_flag) {
 458                 rbsp_uev(rbsp, &pps->num_tile_columns_minus1);
 459                 rbsp_uev(rbsp, &pps->num_tile_rows_minus1);
 460                 rbsp_bit(rbsp, &pps->uniform_spacing_flag);
 461                 if (!pps->uniform_spacing_flag) {
 462                         for (i = 0; i < pps->num_tile_columns_minus1; i++)
 463                                 rbsp_uev(rbsp, &pps->column_width_minus1[i]);
 464                         for (i = 0; i < pps->num_tile_rows_minus1; i++)
 465                                 rbsp_uev(rbsp, &pps->row_height_minus1[i]);
 466                 }
 467                 rbsp_bit(rbsp, &pps->loop_filter_across_tiles_enabled_flag);
 468         }
 469         rbsp_bit(rbsp, &pps->pps_loop_filter_across_slices_enabled_flag);
 470         rbsp_bit(rbsp, &pps->deblocking_filter_control_present_flag);
 471         if (pps->deblocking_filter_control_present_flag) {
 472                 rbsp_bit(rbsp, &pps->deblocking_filter_override_enabled_flag);
 473                 rbsp_bit(rbsp, &pps->pps_deblocking_filter_disabled_flag);
 474                 if (!pps->pps_deblocking_filter_disabled_flag) {
 475                         rbsp_sev(rbsp, &pps->pps_beta_offset_div2);
 476                         rbsp_sev(rbsp, &pps->pps_tc_offset_div2);
 477                 }
 478         }
 479         rbsp_bit(rbsp, &pps->pps_scaling_list_data_present_flag);
 480         if (pps->pps_scaling_list_data_present_flag)
 481                 rbsp_unsupported(rbsp);
 482         rbsp_bit(rbsp, &pps->lists_modification_present_flag);
 483         rbsp_uev(rbsp, &pps->log2_parallel_merge_level_minus2);
 484         rbsp_bit(rbsp, &pps->slice_segment_header_extension_present_flag);
 485         rbsp_bit(rbsp, &pps->pps_extension_present_flag);
 486         if (pps->pps_extension_present_flag) {
 487                 rbsp_bit(rbsp, &pps->pps_range_extension_flag);
 488                 rbsp_bit(rbsp, &pps->pps_multilayer_extension_flag);
 489                 rbsp_bit(rbsp, &pps->pps_3d_extension_flag);
 490                 rbsp_bit(rbsp, &pps->pps_scc_extension_flag);
 491                 rbsp_bits(rbsp, 4, &pps->pps_extension_4bits);
 492         }
 493         if (pps->pps_range_extension_flag)
 494                 rbsp_unsupported(rbsp);
 495         if (pps->pps_multilayer_extension_flag)
 496                 rbsp_unsupported(rbsp);
 497         if (pps->pps_3d_extension_flag)
 498                 rbsp_unsupported(rbsp);
 499         if (pps->pps_scc_extension_flag)
 500                 rbsp_unsupported(rbsp);
 501         if (pps->pps_extension_4bits)
 502                 rbsp_unsupported(rbsp);
 503 }
 504
 505 /**
 506  * nal_hevc_write_vps() - Write PPS NAL unit into RBSP format
 507  * @dev: device pointer
 508  * @dest: the buffer that is filled with RBSP data
 509  * @n: maximum size of @dest in bytes
 510  * @vps: &struct nal_hevc_vps to convert to RBSP
 511  *
 512  * Convert @vps to RBSP data and write it into @dest.
 513  *
 514  * The size of the VPS NAL unit is not known in advance and this function will
 515  * fail, if @dest does not hold sufficient space for the VPS NAL unit.
 516  *
 517  * Return: number of bytes written to @dest or negative error code
 518  */
 519 ssize_t nal_hevc_write_vps(const struct device *dev,
 520                            void *dest, size_t n, struct nal_hevc_vps *vps)
 521 {
 522         struct rbsp rbsp;
 523         unsigned int forbidden_zero_bit = 0;
 524         unsigned int nal_unit_type = VPS_NUT;
 525         unsigned int nuh_layer_id = 0;
 526         unsigned int nuh_temporal_id_plus1 = 1;
 527
 528         if (!dest)
 529                 return -EINVAL;
 530
 531         rbsp_init(&rbsp, dest, n, &write);
 532
 533         nal_hevc_write_start_code_prefix(&rbsp);
 534
 535         /* NAL unit header */
 536         rbsp_bit(&rbsp, &forbidden_zero_bit);
 537         rbsp_bits(&rbsp, 6, &nal_unit_type);
 538         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 539         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 540
 541         nal_hevc_rbsp_vps(&rbsp, vps);
 542
 543         rbsp_trailing_bits(&rbsp);
 544
 545         if (rbsp.error)
 546                 return rbsp.error;
 547
 548         return DIV_ROUND_UP(rbsp.pos, 8);
 549 }
 550 EXPORT_SYMBOL_GPL(nal_hevc_write_vps);
 551
 552 /**
 553  * nal_hevc_read_vps() - Read VPS NAL unit from RBSP format
 554  * @dev: device pointer
 555  * @vps: the &struct nal_hevc_vps to fill from the RBSP data
 556  * @src: the buffer that contains the RBSP data
 557  * @n: size of @src in bytes
 558  *
 559  * Read RBSP data from @src and use it to fill @vps.
 560  *
 561  * Return: number of bytes read from @src or negative error code
 562  */
 563 ssize_t nal_hevc_read_vps(const struct device *dev,
 564                           struct nal_hevc_vps *vps, void *src, size_t n)
 565 {
 566         struct rbsp rbsp;
 567         unsigned int forbidden_zero_bit;
 568         unsigned int nal_unit_type;
 569         unsigned int nuh_layer_id;
 570         unsigned int nuh_temporal_id_plus1;
 571
 572         if (!src)
 573                 return -EINVAL;
 574
 575         rbsp_init(&rbsp, src, n, &read);
 576
 577         nal_hevc_read_start_code_prefix(&rbsp);
 578
 579         rbsp_bit(&rbsp, &forbidden_zero_bit);
 580         rbsp_bits(&rbsp, 6, &nal_unit_type);
 581         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 582         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 583
 584         if (rbsp.error ||
 585             forbidden_zero_bit != 0 ||
 586             nal_unit_type != VPS_NUT)
 587                 return -EINVAL;
 588
 589         nal_hevc_rbsp_vps(&rbsp, vps);
 590
 591         rbsp_trailing_bits(&rbsp);
 592
 593         if (rbsp.error)
 594                 return rbsp.error;
 595
 596         return DIV_ROUND_UP(rbsp.pos, 8);
 597 }
 598 EXPORT_SYMBOL_GPL(nal_hevc_read_vps);
 599
 600 /**
 601  * nal_hevc_write_sps() - Write SPS NAL unit into RBSP format
 602  * @dev: device pointer
 603  * @dest: the buffer that is filled with RBSP data
 604  * @n: maximum size of @dest in bytes
 605  * @sps: &struct nal_hevc_sps to convert to RBSP
 606  *
 607  * Convert @sps to RBSP data and write it into @dest.
 608  *
 609  * The size of the SPS NAL unit is not known in advance and this function will
 610  * fail, if @dest does not hold sufficient space for the SPS NAL unit.
 611  *
 612  * Return: number of bytes written to @dest or negative error code
 613  */
 614 ssize_t nal_hevc_write_sps(const struct device *dev,
 615                            void *dest, size_t n, struct nal_hevc_sps *sps)
 616 {
 617         struct rbsp rbsp;
 618         unsigned int forbidden_zero_bit = 0;
 619         unsigned int nal_unit_type = SPS_NUT;
 620         unsigned int nuh_layer_id = 0;
 621         unsigned int nuh_temporal_id_plus1 = 1;
 622
 623         if (!dest)
 624                 return -EINVAL;
 625
 626         rbsp_init(&rbsp, dest, n, &write);
 627
 628         nal_hevc_write_start_code_prefix(&rbsp);
 629
 630         /* NAL unit header */
 631         rbsp_bit(&rbsp, &forbidden_zero_bit);
 632         rbsp_bits(&rbsp, 6, &nal_unit_type);
 633         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 634         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 635
 636         nal_hevc_rbsp_sps(&rbsp, sps);
 637
 638         rbsp_trailing_bits(&rbsp);
 639
 640         if (rbsp.error)
 641                 return rbsp.error;
 642
 643         return DIV_ROUND_UP(rbsp.pos, 8);
 644 }
 645 EXPORT_SYMBOL_GPL(nal_hevc_write_sps);
 646
 647 /**
 648  * nal_hevc_read_sps() - Read SPS NAL unit from RBSP format
 649  * @dev: device pointer
 650  * @sps: the &struct nal_hevc_sps to fill from the RBSP data
 651  * @src: the buffer that contains the RBSP data
 652  * @n: size of @src in bytes
 653  *
 654  * Read RBSP data from @src and use it to fill @sps.
 655  *
 656  * Return: number of bytes read from @src or negative error code
 657  */
 658 ssize_t nal_hevc_read_sps(const struct device *dev,
 659                           struct nal_hevc_sps *sps, void *src, size_t n)
 660 {
 661         struct rbsp rbsp;
 662         unsigned int forbidden_zero_bit;
 663         unsigned int nal_unit_type;
 664         unsigned int nuh_layer_id;
 665         unsigned int nuh_temporal_id_plus1;
 666
 667         if (!src)
 668                 return -EINVAL;
 669
 670         rbsp_init(&rbsp, src, n, &read);
 671
 672         nal_hevc_read_start_code_prefix(&rbsp);
 673
 674         rbsp_bit(&rbsp, &forbidden_zero_bit);
 675         rbsp_bits(&rbsp, 6, &nal_unit_type);
 676         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 677         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 678
 679         if (rbsp.error ||
 680             forbidden_zero_bit != 0 ||
 681             nal_unit_type != SPS_NUT)
 682                 return -EINVAL;
 683
 684         nal_hevc_rbsp_sps(&rbsp, sps);
 685
 686         rbsp_trailing_bits(&rbsp);
 687
 688         if (rbsp.error)
 689                 return rbsp.error;
 690
 691         return DIV_ROUND_UP(rbsp.pos, 8);
 692 }
 693 EXPORT_SYMBOL_GPL(nal_hevc_read_sps);
 694
 695 /**
 696  * nal_hevc_write_pps() - Write PPS NAL unit into RBSP format
 697  * @dev: device pointer
 698  * @dest: the buffer that is filled with RBSP data
 699  * @n: maximum size of @dest in bytes
 700  * @pps: &struct nal_hevc_pps to convert to RBSP
 701  *
 702  * Convert @pps to RBSP data and write it into @dest.
 703  *
 704  * The size of the PPS NAL unit is not known in advance and this function will
 705  * fail, if @dest does not hold sufficient space for the PPS NAL unit.
 706  *
 707  * Return: number of bytes written to @dest or negative error code
 708  */
 709 ssize_t nal_hevc_write_pps(const struct device *dev,
 710                            void *dest, size_t n, struct nal_hevc_pps *pps)
 711 {
 712         struct rbsp rbsp;
 713         unsigned int forbidden_zero_bit = 0;
 714         unsigned int nal_unit_type = PPS_NUT;
 715         unsigned int nuh_layer_id = 0;
 716         unsigned int nuh_temporal_id_plus1 = 1;
 717
 718         if (!dest)
 719                 return -EINVAL;
 720
 721         rbsp_init(&rbsp, dest, n, &write);
 722
 723         nal_hevc_write_start_code_prefix(&rbsp);
 724
 725         /* NAL unit header */
 726         rbsp_bit(&rbsp, &forbidden_zero_bit);
 727         rbsp_bits(&rbsp, 6, &nal_unit_type);
 728         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 729         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 730
 731         nal_hevc_rbsp_pps(&rbsp, pps);
 732
 733         rbsp_trailing_bits(&rbsp);
 734
 735         if (rbsp.error)
 736                 return rbsp.error;
 737
 738         return DIV_ROUND_UP(rbsp.pos, 8);
 739 }
 740 EXPORT_SYMBOL_GPL(nal_hevc_write_pps);
 741
 742 /**
 743  * nal_hevc_read_pps() - Read PPS NAL unit from RBSP format
 744  * @dev: device pointer
 745  * @pps: the &struct nal_hevc_pps to fill from the RBSP data
 746  * @src: the buffer that contains the RBSP data
 747  * @n: size of @src in bytes
 748  *
 749  * Read RBSP data from @src and use it to fill @pps.
 750  *
 751  * Return: number of bytes read from @src or negative error code
 752  */
 753 ssize_t nal_hevc_read_pps(const struct device *dev,
 754                           struct nal_hevc_pps *pps, void *src, size_t n)
 755 {
 756         struct rbsp rbsp;
 757         unsigned int forbidden_zero_bit;
 758         unsigned int nal_unit_type;
 759         unsigned int nuh_layer_id;
 760         unsigned int nuh_temporal_id_plus1;
 761
 762         if (!src)
 763                 return -EINVAL;
 764
 765         rbsp_init(&rbsp, src, n, &read);
 766
 767         nal_hevc_read_start_code_prefix(&rbsp);
 768
 769         /* NAL unit header */
 770         rbsp_bit(&rbsp, &forbidden_zero_bit);
 771         rbsp_bits(&rbsp, 6, &nal_unit_type);
 772         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 773         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 774
 775         nal_hevc_rbsp_pps(&rbsp, pps);
 776
 777         rbsp_trailing_bits(&rbsp);
 778
 779         if (rbsp.error)
 780                 return rbsp.error;
 781
 782         return DIV_ROUND_UP(rbsp.pos, 8);
 783 }
 784 EXPORT_SYMBOL_GPL(nal_hevc_read_pps);
 785
 786 /**
 787  * nal_hevc_write_filler() - Write filler data RBSP
 788  * @dev: device pointer
 789  * @dest: buffer to fill with filler data
 790  * @n: size of the buffer to fill with filler data
 791  *
 792  * Write a filler data RBSP to @dest with a size of @n bytes and return the
 793  * number of written filler data bytes.
 794  *
 795  * Use this function to generate dummy data in an RBSP data stream that can be
 796  * safely ignored by hevc decoders.
 797  *
 798  * The RBSP format of the filler data is specified in Rec. ITU-T H.265
 799  * (02/2018) 7.3.2.8 Filler data RBSP syntax.
 800  *
 801  * Return: number of filler data bytes (including marker) or negative error
 802  */
 803 ssize_t nal_hevc_write_filler(const struct device *dev, void *dest, size_t n)
 804 {
 805         struct rbsp rbsp;
 806         unsigned int forbidden_zero_bit = 0;
 807         unsigned int nal_unit_type = FD_NUT;
 808         unsigned int nuh_layer_id = 0;
 809         unsigned int nuh_temporal_id_plus1 = 1;
 810
 811         if (!dest)
 812                 return -EINVAL;
 813
 814         rbsp_init(&rbsp, dest, n, &write);
 815
 816         nal_hevc_write_start_code_prefix(&rbsp);
 817
 818         rbsp_bit(&rbsp, &forbidden_zero_bit);
 819         rbsp_bits(&rbsp, 6, &nal_unit_type);
 820         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 821         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 822
 823         nal_hevc_write_filler_data(&rbsp);
 824         rbsp_trailing_bits(&rbsp);
 825
 826         if (rbsp.error)
 827                 return rbsp.error;
 828
 829         return DIV_ROUND_UP(rbsp.pos, 8);
 830 }
 831 EXPORT_SYMBOL_GPL(nal_hevc_write_filler);
 832
 833 /**
 834  * nal_hevc_read_filler() - Read filler data RBSP
 835  * @dev: device pointer
 836  * @src: buffer with RBSP data that is read
 837  * @n: maximum size of src that shall be read
 838  *
 839  * Read a filler data RBSP from @src up to a maximum size of @n bytes and
 840  * return the size of the filler data in bytes including the marker.
 841  *
 842  * This function is used to parse filler data and skip the respective bytes in
 843  * the RBSP data.
 844  *
 845  * The RBSP format of the filler data is specified in Rec. ITU-T H.265
 846  * (02/2018) 7.3.2.8 Filler data RBSP syntax.
 847  *
 848  * Return: number of filler data bytes (including marker) or negative error
 849  */
 850 ssize_t nal_hevc_read_filler(const struct device *dev, void *src, size_t n)
 851 {
 852         struct rbsp rbsp;
 853         unsigned int forbidden_zero_bit;
 854         unsigned int nal_unit_type;
 855         unsigned int nuh_layer_id;
 856         unsigned int nuh_temporal_id_plus1;
 857
 858         if (!src)
 859                 return -EINVAL;
 860
 861         rbsp_init(&rbsp, src, n, &read);
 862
 863         nal_hevc_read_start_code_prefix(&rbsp);
 864
 865         rbsp_bit(&rbsp, &forbidden_zero_bit);
 866         rbsp_bits(&rbsp, 6, &nal_unit_type);
 867         rbsp_bits(&rbsp, 6, &nuh_layer_id);
 868         rbsp_bits(&rbsp, 3, &nuh_temporal_id_plus1);
 869
 870         if (rbsp.error)
 871                 return rbsp.error;
 872         if (forbidden_zero_bit != 0 ||
 873             nal_unit_type != FD_NUT)
 874                 return -EINVAL;
 875
 876         nal_hevc_read_filler_data(&rbsp);
 877         rbsp_trailing_bits(&rbsp);
 878
 879         if (rbsp.error)
 880                 return rbsp.error;
 881
 882         return DIV_ROUND_UP(rbsp.pos, 8);
 883 }
 884 EXPORT_SYMBOL_GPL(nal_hevc_read_filler);