git.sesse.net Git - ffmpeg/blob - libavcodec/vaapi_hevc.c

   1 /*
   2  * HEVC HW decode acceleration through VA API
   3  *
   4  * Copyright (C) 2015 Timo Rothenpieler <timo@rothenpieler.org>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <va/va.h>
  24 #include <va/va_dec_hevc.h>
  25
  26 #include "avcodec.h"
  27 #include "hevc.h"
  28 #include "vaapi_decode.h"
  29
  30 typedef struct VAAPIDecodePictureHEVC {
  31     VAPictureParameterBufferHEVC pic_param;
  32     VASliceParameterBufferHEVC last_slice_param;
  33     const uint8_t *last_buffer;
  34     size_t         last_size;
  35
  36     VAAPIDecodePicture pic;
  37 } VAAPIDecodePictureHEVC;
  38
  39 static void init_vaapi_pic(VAPictureHEVC *va_pic)
  40 {
  41     va_pic->picture_id    = VA_INVALID_ID;
  42     va_pic->flags         = VA_PICTURE_HEVC_INVALID;
  43     va_pic->pic_order_cnt = 0;
  44 }
  45
  46 static void fill_vaapi_pic(VAPictureHEVC *va_pic, const HEVCFrame *pic, int rps_type)
  47 {
  48     va_pic->picture_id    = ff_vaapi_get_surface_id(pic->frame);
  49     va_pic->pic_order_cnt = pic->poc;
  50     va_pic->flags         = rps_type;
  51
  52     if (pic->flags & HEVC_FRAME_FLAG_LONG_REF)
  53         va_pic->flags |= VA_PICTURE_HEVC_LONG_TERM_REFERENCE;
  54
  55     if (pic->frame->interlaced_frame) {
  56         va_pic->flags |= VA_PICTURE_HEVC_FIELD_PIC;
  57
  58         if (!pic->frame->top_field_first)
  59             va_pic->flags |= VA_PICTURE_HEVC_BOTTOM_FIELD;
  60     }
  61 }
  62
  63 static int find_frame_rps_type(const HEVCContext *h, const HEVCFrame *pic)
  64 {
  65     VASurfaceID pic_surf = ff_vaapi_get_surface_id(pic->frame);
  66     int i;
  67
  68     for (i = 0; i < h->rps[ST_CURR_BEF].nb_refs; i++) {
  69         if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_BEF].ref[i]->frame))
  70             return VA_PICTURE_HEVC_RPS_ST_CURR_BEFORE;
  71     }
  72
  73     for (i = 0; i < h->rps[ST_CURR_AFT].nb_refs; i++) {
  74         if (pic_surf == ff_vaapi_get_surface_id(h->rps[ST_CURR_AFT].ref[i]->frame))
  75             return VA_PICTURE_HEVC_RPS_ST_CURR_AFTER;
  76     }
  77
  78     for (i = 0; i < h->rps[LT_CURR].nb_refs; i++) {
  79         if (pic_surf == ff_vaapi_get_surface_id(h->rps[LT_CURR].ref[i]->frame))
  80             return VA_PICTURE_HEVC_RPS_LT_CURR;
  81     }
  82
  83     return 0;
  84 }
  85
  86 static void fill_vaapi_reference_frames(const HEVCContext *h, VAPictureParameterBufferHEVC *pp)
  87 {
  88     const HEVCFrame *current_picture = h->ref;
  89     int i, j, rps_type;
  90
  91     for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); i++) {
  92         const HEVCFrame *frame = NULL;
  93
  94         while (!frame && j < FF_ARRAY_ELEMS(h->DPB)) {
  95             if (&h->DPB[j] != current_picture && (h->DPB[j].flags & (HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF)))
  96                 frame = &h->DPB[j];
  97             j++;
  98         }
  99
 100         init_vaapi_pic(&pp->ReferenceFrames[i]);
 101
 102         if (frame) {
 103             rps_type = find_frame_rps_type(h, frame);
 104             fill_vaapi_pic(&pp->ReferenceFrames[i], frame, rps_type);
 105         }
 106     }
 107 }
 108
 109 static int vaapi_hevc_start_frame(AVCodecContext          *avctx,
 110                                   av_unused const uint8_t *buffer,
 111                                   av_unused uint32_t       size)
 112 {
 113     const HEVCContext        *h = avctx->priv_data;
 114     VAAPIDecodePictureHEVC *pic = h->ref->hwaccel_picture_private;
 115     const HEVCSPS          *sps = h->ps.sps;
 116     const HEVCPPS          *pps = h->ps.pps;
 117
 118     const ScalingList *scaling_list = NULL;
 119     int err, i;
 120
 121     pic->pic.output_surface = ff_vaapi_get_surface_id(h->ref->frame);
 122
 123     pic->pic_param = (VAPictureParameterBufferHEVC) {
 124         .pic_fields.value                             = 0,
 125         .slice_parsing_fields.value                   = 0,
 126         .pic_width_in_luma_samples                    = sps->width,
 127         .pic_height_in_luma_samples                   = sps->height,
 128         .log2_min_luma_coding_block_size_minus3       = sps->log2_min_cb_size - 3,
 129         .sps_max_dec_pic_buffering_minus1             = sps->temporal_layer[sps->max_sub_layers - 1].max_dec_pic_buffering - 1,
 130         .log2_diff_max_min_luma_coding_block_size     = sps->log2_diff_max_min_coding_block_size,
 131         .log2_min_transform_block_size_minus2         = sps->log2_min_tb_size - 2,
 132         .log2_diff_max_min_transform_block_size       = sps->log2_max_trafo_size  - sps->log2_min_tb_size,
 133         .max_transform_hierarchy_depth_inter          = sps->max_transform_hierarchy_depth_inter,
 134         .max_transform_hierarchy_depth_intra          = sps->max_transform_hierarchy_depth_intra,
 135         .num_short_term_ref_pic_sets                  = sps->nb_st_rps,
 136         .num_long_term_ref_pic_sps                    = sps->num_long_term_ref_pics_sps,
 137         .num_ref_idx_l0_default_active_minus1         = pps->num_ref_idx_l0_default_active - 1,
 138         .num_ref_idx_l1_default_active_minus1         = pps->num_ref_idx_l1_default_active - 1,
 139         .init_qp_minus26                              = pps->pic_init_qp_minus26,
 140         .pps_cb_qp_offset                             = pps->cb_qp_offset,
 141         .pps_cr_qp_offset                             = pps->cr_qp_offset,
 142         .pcm_sample_bit_depth_luma_minus1             = sps->pcm.bit_depth - 1,
 143         .pcm_sample_bit_depth_chroma_minus1           = sps->pcm.bit_depth_chroma - 1,
 144         .log2_min_pcm_luma_coding_block_size_minus3   = sps->pcm.log2_min_pcm_cb_size - 3,
 145         .log2_diff_max_min_pcm_luma_coding_block_size = sps->pcm.log2_max_pcm_cb_size - sps->pcm.log2_min_pcm_cb_size,
 146         .diff_cu_qp_delta_depth                       = pps->diff_cu_qp_delta_depth,
 147         .pps_beta_offset_div2                         = pps->beta_offset / 2,
 148         .pps_tc_offset_div2                           = pps->tc_offset / 2,
 149         .log2_parallel_merge_level_minus2             = pps->log2_parallel_merge_level - 2,
 150         .bit_depth_luma_minus8                        = sps->bit_depth - 8,
 151         .bit_depth_chroma_minus8                      = sps->bit_depth - 8,
 152         .log2_max_pic_order_cnt_lsb_minus4            = sps->log2_max_poc_lsb - 4,
 153         .num_extra_slice_header_bits                  = pps->num_extra_slice_header_bits,
 154         .pic_fields.bits = {
 155             .chroma_format_idc                          = sps->chroma_format_idc,
 156             .tiles_enabled_flag                         = pps->tiles_enabled_flag,
 157             .separate_colour_plane_flag                 = sps->separate_colour_plane_flag,
 158             .pcm_enabled_flag                           = sps->pcm_enabled_flag,
 159             .scaling_list_enabled_flag                  = sps->scaling_list_enable_flag,
 160             .transform_skip_enabled_flag                = pps->transform_skip_enabled_flag,
 161             .amp_enabled_flag                           = sps->amp_enabled_flag,
 162             .strong_intra_smoothing_enabled_flag        = sps->sps_strong_intra_smoothing_enable_flag,
 163             .sign_data_hiding_enabled_flag              = pps->sign_data_hiding_flag,
 164             .constrained_intra_pred_flag                = pps->constrained_intra_pred_flag,
 165             .cu_qp_delta_enabled_flag                   = pps->cu_qp_delta_enabled_flag,
 166             .weighted_pred_flag                         = pps->weighted_pred_flag,
 167             .weighted_bipred_flag                       = pps->weighted_bipred_flag,
 168             .transquant_bypass_enabled_flag             = pps->transquant_bypass_enable_flag,
 169             .entropy_coding_sync_enabled_flag           = pps->entropy_coding_sync_enabled_flag,
 170             .pps_loop_filter_across_slices_enabled_flag = pps->seq_loop_filter_across_slices_enabled_flag,
 171             .loop_filter_across_tiles_enabled_flag      = pps->loop_filter_across_tiles_enabled_flag,
 172             .pcm_loop_filter_disabled_flag              = sps->pcm.loop_filter_disable_flag,
 173         },
 174         .slice_parsing_fields.bits = {
 175             .lists_modification_present_flag             = pps->lists_modification_present_flag,
 176             .long_term_ref_pics_present_flag             = sps->long_term_ref_pics_present_flag,
 177             .sps_temporal_mvp_enabled_flag               = sps->sps_temporal_mvp_enabled_flag,
 178             .cabac_init_present_flag                     = pps->cabac_init_present_flag,
 179             .output_flag_present_flag                    = pps->output_flag_present_flag,
 180             .dependent_slice_segments_enabled_flag       = pps->dependent_slice_segments_enabled_flag,
 181             .pps_slice_chroma_qp_offsets_present_flag    = pps->pic_slice_level_chroma_qp_offsets_present_flag,
 182             .sample_adaptive_offset_enabled_flag         = sps->sao_enabled,
 183             .deblocking_filter_override_enabled_flag     = pps->deblocking_filter_override_enabled_flag,
 184             .pps_disable_deblocking_filter_flag          = pps->disable_dbf,
 185             .slice_segment_header_extension_present_flag = pps->slice_header_extension_present_flag,
 186             .RapPicFlag                                  = IS_IRAP(h),
 187             .IdrPicFlag                                  = IS_IDR(h),
 188             .IntraPicFlag                                = IS_IRAP(h),
 189         },
 190     };
 191
 192     fill_vaapi_pic(&pic->pic_param.CurrPic, h->ref, 0);
 193     fill_vaapi_reference_frames(h, &pic->pic_param);
 194
 195     if (pps->tiles_enabled_flag) {
 196         pic->pic_param.num_tile_columns_minus1 = pps->num_tile_columns - 1;
 197         pic->pic_param.num_tile_rows_minus1    = pps->num_tile_rows - 1;
 198
 199         for (i = 0; i < pps->num_tile_columns; i++)
 200             pic->pic_param.column_width_minus1[i] = pps->column_width[i] - 1;
 201
 202         for (i = 0; i < pps->num_tile_rows; i++)
 203             pic->pic_param.row_height_minus1[i] = pps->row_height[i] - 1;
 204     }
 205
 206     if (h->sh.short_term_ref_pic_set_sps_flag == 0 && h->sh.short_term_rps) {
 207         pic->pic_param.st_rps_bits = h->sh.short_term_ref_pic_set_size;
 208     } else {
 209         pic->pic_param.st_rps_bits = 0;
 210     }
 211
 212     err = ff_vaapi_decode_make_param_buffer(avctx, &pic->pic,
 213                                             VAPictureParameterBufferType,
 214                                             &pic->pic_param, sizeof(pic->pic_param));
 215     if (err < 0)
 216         goto fail;
 217
 218     if (pps->scaling_list_data_present_flag)
 219         scaling_list = &pps->scaling_list;
 220     else if (sps->scaling_list_enable_flag)
 221         scaling_list = &sps->scaling_list;
 222
 223     if (scaling_list) {
 224         VAIQMatrixBufferHEVC iq_matrix;
 225         int j;
 226
 227         for (i = 0; i < 6; i++) {
 228             for (j = 0; j < 16; j++)
 229                 iq_matrix.ScalingList4x4[i][j] = scaling_list->sl[0][i][j];
 230             for (j = 0; j < 64; j++) {
 231                 iq_matrix.ScalingList8x8[i][j]   = scaling_list->sl[1][i][j];
 232                 iq_matrix.ScalingList16x16[i][j] = scaling_list->sl[2][i][j];
 233                 if (i < 2)
 234                     iq_matrix.ScalingList32x32[i][j] = scaling_list->sl[3][i * 3][j];
 235             }
 236             iq_matrix.ScalingListDC16x16[i] = scaling_list->sl_dc[0][i];
 237             if (i < 2)
 238                 iq_matrix.ScalingListDC32x32[i] = scaling_list->sl_dc[1][i * 3];
 239         }
 240
 241         err = ff_vaapi_decode_make_param_buffer(avctx, &pic->pic,
 242                                                 VAIQMatrixBufferType,
 243                                                 &iq_matrix, sizeof(iq_matrix));
 244         if (err < 0)
 245             goto fail;
 246     }
 247
 248     return 0;
 249
 250 fail:
 251     ff_vaapi_decode_cancel(avctx, &pic->pic);
 252     return err;
 253 }
 254
 255 static int vaapi_hevc_end_frame(AVCodecContext *avctx)
 256 {
 257     const HEVCContext        *h = avctx->priv_data;
 258     VAAPIDecodePictureHEVC *pic = h->ref->hwaccel_picture_private;
 259     int ret;
 260
 261     if (pic->last_size) {
 262         pic->last_slice_param.LongSliceFlags.fields.LastSliceOfPic = 1;
 263         ret = ff_vaapi_decode_make_slice_buffer(avctx, &pic->pic,
 264                                                 &pic->last_slice_param, sizeof(pic->last_slice_param),
 265                                                 pic->last_buffer, pic->last_size);
 266         if (ret < 0)
 267             goto fail;
 268     }
 269
 270
 271     ret = ff_vaapi_decode_issue(avctx, &pic->pic);
 272     if (ret < 0)
 273         goto fail;
 274
 275     return 0;
 276 fail:
 277     ff_vaapi_decode_cancel(avctx, &pic->pic);
 278     return ret;
 279 }
 280
 281 static void fill_pred_weight_table(const HEVCContext *h,
 282                                    const SliceHeader *sh,
 283                                    VASliceParameterBufferHEVC *slice_param)
 284 {
 285     int i;
 286
 287     memset(slice_param->delta_luma_weight_l0,   0, sizeof(slice_param->delta_luma_weight_l0));
 288     memset(slice_param->delta_luma_weight_l1,   0, sizeof(slice_param->delta_luma_weight_l1));
 289     memset(slice_param->luma_offset_l0,         0, sizeof(slice_param->luma_offset_l0));
 290     memset(slice_param->luma_offset_l1,         0, sizeof(slice_param->luma_offset_l1));
 291     memset(slice_param->delta_chroma_weight_l0, 0, sizeof(slice_param->delta_chroma_weight_l0));
 292     memset(slice_param->delta_chroma_weight_l1, 0, sizeof(slice_param->delta_chroma_weight_l1));
 293     memset(slice_param->ChromaOffsetL0,         0, sizeof(slice_param->ChromaOffsetL0));
 294     memset(slice_param->ChromaOffsetL1,         0, sizeof(slice_param->ChromaOffsetL1));
 295
 296     slice_param->delta_chroma_log2_weight_denom = 0;
 297     slice_param->luma_log2_weight_denom         = 0;
 298
 299     if (sh->slice_type == I_SLICE ||
 300         (sh->slice_type == P_SLICE && !h->ps.pps->weighted_pred_flag) ||
 301         (sh->slice_type == B_SLICE && !h->ps.pps->weighted_bipred_flag))
 302         return;
 303
 304     slice_param->luma_log2_weight_denom = sh->luma_log2_weight_denom;
 305
 306     if (h->ps.sps->chroma_format_idc) {
 307         slice_param->delta_chroma_log2_weight_denom = sh->chroma_log2_weight_denom - sh->luma_log2_weight_denom;
 308     }
 309
 310     for (i = 0; i < 15 && i < sh->nb_refs[L0]; i++) {
 311         slice_param->delta_luma_weight_l0[i] = sh->luma_weight_l0[i] - (1 << sh->luma_log2_weight_denom);
 312         slice_param->luma_offset_l0[i] = sh->luma_offset_l0[i];
 313         slice_param->delta_chroma_weight_l0[i][0] = sh->chroma_weight_l0[i][0] - (1 << sh->chroma_log2_weight_denom);
 314         slice_param->delta_chroma_weight_l0[i][1] = sh->chroma_weight_l0[i][1] - (1 << sh->chroma_log2_weight_denom);
 315         slice_param->ChromaOffsetL0[i][0] = sh->chroma_offset_l0[i][0];
 316         slice_param->ChromaOffsetL0[i][1] = sh->chroma_offset_l0[i][1];
 317     }
 318
 319     if (sh->slice_type == B_SLICE) {
 320         for (i = 0; i < 15 && i < sh->nb_refs[L1]; i++) {
 321             slice_param->delta_luma_weight_l1[i] = sh->luma_weight_l1[i] - (1 << sh->luma_log2_weight_denom);
 322             slice_param->luma_offset_l1[i] = sh->luma_offset_l1[i];
 323             slice_param->delta_chroma_weight_l1[i][0] = sh->chroma_weight_l1[i][0] - (1 << sh->chroma_log2_weight_denom);
 324             slice_param->delta_chroma_weight_l1[i][1] = sh->chroma_weight_l1[i][1] - (1 << sh->chroma_log2_weight_denom);
 325             slice_param->ChromaOffsetL1[i][0] = sh->chroma_offset_l1[i][0];
 326             slice_param->ChromaOffsetL1[i][1] = sh->chroma_offset_l1[i][1];
 327         }
 328     }
 329 }
 330
 331 static uint8_t get_ref_pic_index(const HEVCContext *h, const HEVCFrame *frame)
 332 {
 333     VAAPIDecodePictureHEVC *pic = h->ref->hwaccel_picture_private;
 334     VAPictureParameterBufferHEVC *pp = &pic->pic_param;
 335     uint8_t i;
 336
 337     if (!frame)
 338         return 0xff;
 339
 340     for (i = 0; i < FF_ARRAY_ELEMS(pp->ReferenceFrames); i++) {
 341         VASurfaceID pid = pp->ReferenceFrames[i].picture_id;
 342         int poc = pp->ReferenceFrames[i].pic_order_cnt;
 343         if (pid != VA_INVALID_ID && pid == ff_vaapi_get_surface_id(frame->frame) && poc == frame->poc)
 344             return i;
 345     }
 346
 347     return 0xff;
 348 }
 349
 350 static int vaapi_hevc_decode_slice(AVCodecContext *avctx,
 351                                    const uint8_t  *buffer,
 352                                    uint32_t        size)
 353 {
 354     const HEVCContext        *h = avctx->priv_data;
 355     const SliceHeader       *sh = &h->sh;
 356     VAAPIDecodePictureHEVC *pic = h->ref->hwaccel_picture_private;
 357
 358     int nb_list = (sh->slice_type == B_SLICE) ?
 359                   2 : (sh->slice_type == I_SLICE ? 0 : 1);
 360
 361     int err, i, list_idx;
 362
 363     if (!sh->first_slice_in_pic_flag) {
 364         err = ff_vaapi_decode_make_slice_buffer(avctx, &pic->pic,
 365                                                 &pic->last_slice_param, sizeof(pic->last_slice_param),
 366                                                 pic->last_buffer, pic->last_size);
 367         pic->last_buffer = NULL;
 368         pic->last_size   = 0;
 369         if (err) {
 370             ff_vaapi_decode_cancel(avctx, &pic->pic);
 371             return err;
 372         }
 373     }
 374
 375     pic->last_slice_param = (VASliceParameterBufferHEVC) {
 376         .slice_data_size               = size,
 377         .slice_data_offset             = 0,
 378         .slice_data_flag               = VA_SLICE_DATA_FLAG_ALL,
 379         /* Add 1 to the bits count here to account for the byte_alignment bit, which
 380          * always is at least one bit and not accounted for otherwise. */
 381         .slice_data_byte_offset        = (get_bits_count(&h->HEVClc->gb) + 1 + 7) / 8,
 382         .slice_segment_address         = sh->slice_segment_addr,
 383         .slice_qp_delta                = sh->slice_qp_delta,
 384         .slice_cb_qp_offset            = sh->slice_cb_qp_offset,
 385         .slice_cr_qp_offset            = sh->slice_cr_qp_offset,
 386         .slice_beta_offset_div2        = sh->beta_offset / 2,
 387         .slice_tc_offset_div2          = sh->tc_offset / 2,
 388         .collocated_ref_idx            = sh->slice_temporal_mvp_enabled_flag ? sh->collocated_ref_idx : 0xFF,
 389         .five_minus_max_num_merge_cand = sh->slice_type == I_SLICE ? 0 : 5 - sh->max_num_merge_cand,
 390         .num_ref_idx_l0_active_minus1  = sh->nb_refs[L0] ? sh->nb_refs[L0] - 1 : 0,
 391         .num_ref_idx_l1_active_minus1  = sh->nb_refs[L1] ? sh->nb_refs[L1] - 1 : 0,
 392
 393         .LongSliceFlags.fields = {
 394             .dependent_slice_segment_flag                 = sh->dependent_slice_segment_flag,
 395             .slice_type                                   = sh->slice_type,
 396             .color_plane_id                               = sh->colour_plane_id,
 397             .mvd_l1_zero_flag                             = sh->mvd_l1_zero_flag,
 398             .cabac_init_flag                              = sh->cabac_init_flag,
 399             .slice_temporal_mvp_enabled_flag              = sh->slice_temporal_mvp_enabled_flag,
 400             .slice_deblocking_filter_disabled_flag        = sh->disable_deblocking_filter_flag,
 401             .collocated_from_l0_flag                      = sh->collocated_list == L0 ? 1 : 0,
 402             .slice_loop_filter_across_slices_enabled_flag = sh->slice_loop_filter_across_slices_enabled_flag,
 403             .slice_sao_luma_flag                          = sh->slice_sample_adaptive_offset_flag[0],
 404             .slice_sao_chroma_flag                        = sh->slice_sample_adaptive_offset_flag[1],
 405         },
 406     };
 407
 408     memset(pic->last_slice_param.RefPicList, 0xFF, sizeof(pic->last_slice_param.RefPicList));
 409
 410     for (list_idx = 0; list_idx < nb_list; list_idx++) {
 411         RefPicList *rpl = &h->ref->refPicList[list_idx];
 412
 413         for (i = 0; i < rpl->nb_refs; i++)
 414             pic->last_slice_param.RefPicList[list_idx][i] = get_ref_pic_index(h, rpl->ref[i]);
 415     }
 416
 417     fill_pred_weight_table(h, sh, &pic->last_slice_param);
 418
 419     pic->last_buffer = buffer;
 420     pic->last_size   = size;
 421
 422     return 0;
 423 }
 424
 425 AVHWAccel ff_hevc_vaapi_hwaccel = {
 426     .name                 = "hevc_vaapi",
 427     .type                 = AVMEDIA_TYPE_VIDEO,
 428     .id                   = AV_CODEC_ID_HEVC,
 429     .pix_fmt              = AV_PIX_FMT_VAAPI,
 430     .start_frame          = vaapi_hevc_start_frame,
 431     .end_frame            = vaapi_hevc_end_frame,
 432     .decode_slice         = vaapi_hevc_decode_slice,
 433     .frame_priv_data_size = sizeof(VAAPIDecodePictureHEVC),
 434     .init                 = ff_vaapi_decode_init,
 435     .uninit               = ff_vaapi_decode_uninit,
 436     .priv_data_size       = sizeof(VAAPIDecodeContext),
 437 };