static int vaapi_vc1_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)

{

    VC1Context * const v = avctx->priv_data;

    MpegEncContext * const s = &v->s;

    struct vaapi_context * const vactx = avctx->hwaccel_context;

    VAPictureParameterBufferVC1 *pic_param;



    av_dlog(avctx, "vaapi_vc1_start_frame()\n");



    vactx->slice_param_size = sizeof(VASliceParameterBufferVC1);



    /* Fill in VAPictureParameterBufferVC1 */

    pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferVC1));

    if (!pic_param)

        return -1;

    pic_param->forward_reference_picture                            = VA_INVALID_ID;

    pic_param->backward_reference_picture                           = VA_INVALID_ID;

    pic_param->inloop_decoded_picture                               = VA_INVALID_ID;

    pic_param->sequence_fields.value                                = 0; /* reset all bits */

    pic_param->sequence_fields.bits.pulldown                        = v->broadcast;

    pic_param->sequence_fields.bits.interlace                       = v->interlace;

    pic_param->sequence_fields.bits.tfcntrflag                      = v->tfcntrflag;

    pic_param->sequence_fields.bits.finterpflag                     = v->finterpflag;

    pic_param->sequence_fields.bits.psf                             = v->psf;

    pic_param->sequence_fields.bits.multires                        = v->multires;

    pic_param->sequence_fields.bits.overlap                         = v->overlap;

    pic_param->sequence_fields.bits.syncmarker                      = v->resync_marker;

    pic_param->sequence_fields.bits.rangered                        = v->rangered;

    pic_param->sequence_fields.bits.max_b_frames                    = s->avctx->max_b_frames;

#if VA_CHECK_VERSION(0,32,0)

    pic_param->sequence_fields.bits.profile                         = v->profile;

#endif

    pic_param->coded_width                                          = s->avctx->coded_width;

    pic_param->coded_height                                         = s->avctx->coded_height;

    pic_param->entrypoint_fields.value                              = 0; /* reset all bits */

    pic_param->entrypoint_fields.bits.broken_link                   = v->broken_link;

    pic_param->entrypoint_fields.bits.closed_entry                  = v->closed_entry;

    pic_param->entrypoint_fields.bits.panscan_flag                  = v->panscanflag;

    pic_param->entrypoint_fields.bits.loopfilter                    = s->loop_filter;

    pic_param->conditional_overlap_flag                             = v->condover;

    pic_param->fast_uvmc_flag                                       = v->fastuvmc;

    pic_param->range_mapping_fields.value                           = 0; /* reset all bits */

    pic_param->range_mapping_fields.bits.luma_flag                  = v->range_mapy_flag;

    pic_param->range_mapping_fields.bits.luma                       = v->range_mapy;

    pic_param->range_mapping_fields.bits.chroma_flag                = v->range_mapuv_flag;

    pic_param->range_mapping_fields.bits.chroma                     = v->range_mapuv;

    pic_param->b_picture_fraction                                   = v->bfraction_lut_index;

    pic_param->cbp_table                                            = v->cbpcy_vlc ? v->cbpcy_vlc - ff_vc1_cbpcy_p_vlc : 0;

    pic_param->mb_mode_table                                        = 0; /* XXX: interlaced frame */

    pic_param->range_reduction_frame                                = v->rangeredfrm;

    pic_param->rounding_control                                     = v->rnd;

    pic_param->post_processing                                      = v->postproc;

    pic_param->picture_resolution_index                             = v->respic;

    pic_param->luma_scale                                           = v->lumscale;

    pic_param->luma_shift                                           = v->lumshift;

    pic_param->picture_fields.value                                 = 0; /* reset all bits */

    pic_param->picture_fields.bits.picture_type                     = vc1_get_PTYPE(v);

    pic_param->picture_fields.bits.frame_coding_mode                = v->fcm;

    pic_param->picture_fields.bits.top_field_first                  = v->tff;

    pic_param->picture_fields.bits.is_first_field                   = v->fcm == 0; /* XXX: interlaced frame */

    pic_param->picture_fields.bits.intensity_compensation           = v->mv_mode == MV_PMODE_INTENSITY_COMP;

    pic_param->raw_coding.value                                     = 0; /* reset all bits */

    pic_param->raw_coding.flags.mv_type_mb                          = v->mv_type_is_raw;

    pic_param->raw_coding.flags.direct_mb                           = v->dmb_is_raw;

    pic_param->raw_coding.flags.skip_mb                             = v->skip_is_raw;

    pic_param->raw_coding.flags.field_tx                            = 0; /* XXX: interlaced frame */

    pic_param->raw_coding.flags.forward_mb                          = 0; /* XXX: interlaced frame */

    pic_param->raw_coding.flags.ac_pred                             = v->acpred_is_raw;

    pic_param->raw_coding.flags.overflags                           = v->overflg_is_raw;

    pic_param->bitplane_present.value                               = 0; /* reset all bits */

    pic_param->bitplane_present.flags.bp_mv_type_mb                 = vc1_has_MVTYPEMB_bitplane(v);

    pic_param->bitplane_present.flags.bp_direct_mb                  = vc1_has_DIRECTMB_bitplane(v);

    pic_param->bitplane_present.flags.bp_skip_mb                    = vc1_has_SKIPMB_bitplane(v);

    pic_param->bitplane_present.flags.bp_field_tx                   = 0; /* XXX: interlaced frame */

    pic_param->bitplane_present.flags.bp_forward_mb                 = 0; /* XXX: interlaced frame */

    pic_param->bitplane_present.flags.bp_ac_pred                    = vc1_has_ACPRED_bitplane(v);

    pic_param->bitplane_present.flags.bp_overflags                  = vc1_has_OVERFLAGS_bitplane(v);

    pic_param->reference_fields.value                               = 0; /* reset all bits */

    pic_param->reference_fields.bits.reference_distance_flag        = v->refdist_flag;

    pic_param->reference_fields.bits.reference_distance             = 0; /* XXX: interlaced frame */

    pic_param->reference_fields.bits.num_reference_pictures         = 0; /* XXX: interlaced frame */

    pic_param->reference_fields.bits.reference_field_pic_indicator  = 0; /* XXX: interlaced frame */

    pic_param->mv_fields.value                                      = 0; /* reset all bits */

    pic_param->mv_fields.bits.mv_mode                               = vc1_get_MVMODE(v);

    pic_param->mv_fields.bits.mv_mode2                              = vc1_get_MVMODE2(v);

    pic_param->mv_fields.bits.mv_table                              = s->mv_table_index;

    pic_param->mv_fields.bits.two_mv_block_pattern_table            = 0; /* XXX: interlaced frame */

    pic_param->mv_fields.bits.four_mv_switch                        = 0; /* XXX: interlaced frame */

    pic_param->mv_fields.bits.four_mv_block_pattern_table           = 0; /* XXX: interlaced frame */

    pic_param->mv_fields.bits.extended_mv_flag                      = v->extended_mv;

    pic_param->mv_fields.bits.extended_mv_range                     = v->mvrange;

    pic_param->mv_fields.bits.extended_dmv_flag                     = v->extended_dmv;

    pic_param->mv_fields.bits.extended_dmv_range                    = 0; /* XXX: interlaced frame */

    pic_param->pic_quantizer_fields.value                           = 0; /* reset all bits */

    pic_param->pic_quantizer_fields.bits.dquant                     = v->dquant;

    pic_param->pic_quantizer_fields.bits.quantizer                  = v->quantizer_mode;

    pic_param->pic_quantizer_fields.bits.half_qp                    = v->halfpq;

    pic_param->pic_quantizer_fields.bits.pic_quantizer_scale        = v->pq;

    pic_param->pic_quantizer_fields.bits.pic_quantizer_type         = v->pquantizer;

    pic_param->pic_quantizer_fields.bits.dq_frame                   = v->dquantfrm;

    pic_param->pic_quantizer_fields.bits.dq_profile                 = v->dqprofile;

    pic_param->pic_quantizer_fields.bits.dq_sb_edge                 = v->dqprofile == DQPROFILE_SINGLE_EDGE  ? v->dqsbedge : 0;

    pic_param->pic_quantizer_fields.bits.dq_db_edge                 = v->dqprofile == DQPROFILE_DOUBLE_EDGES ? v->dqsbedge : 0;

    pic_param->pic_quantizer_fields.bits.dq_binary_level            = v->dqbilevel;

    pic_param->pic_quantizer_fields.bits.alt_pic_quantizer          = v->altpq;

    pic_param->transform_fields.value                               = 0; /* reset all bits */

    pic_param->transform_fields.bits.variable_sized_transform_flag  = v->vstransform;

    pic_param->transform_fields.bits.mb_level_transform_type_flag   = v->ttmbf;

    pic_param->transform_fields.bits.frame_level_transform_type     = vc1_get_TTFRM(v);

    pic_param->transform_fields.bits.transform_ac_codingset_idx1    = v->c_ac_table_index;

    pic_param->transform_fields.bits.transform_ac_codingset_idx2    = v->y_ac_table_index;

    pic_param->transform_fields.bits.intra_transform_dc_table       = v->s.dc_table_index;



    switch (s->pict_type) {

    case AV_PICTURE_TYPE_B:

        pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture.f);

        // fall-through

    case AV_PICTURE_TYPE_P:

        pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture.f);

        break;

    }



    if (pic_param->bitplane_present.value) {

        uint8_t *bitplane;

        const uint8_t *ff_bp[3];

        int x, y, n;



        switch (s->pict_type) {

        case AV_PICTURE_TYPE_P:

            ff_bp[0] = pic_param->bitplane_present.flags.bp_direct_mb  ? v->direct_mb_plane    : NULL;

            ff_bp[1] = pic_param->bitplane_present.flags.bp_skip_mb    ? s->mbskip_table       : NULL;

            ff_bp[2] = pic_param->bitplane_present.flags.bp_mv_type_mb ? v->mv_type_mb_plane   : NULL;

            break;

        case AV_PICTURE_TYPE_B:

            if (!v->bi_type) {

                ff_bp[0] = pic_param->bitplane_present.flags.bp_direct_mb ? v->direct_mb_plane : NULL;

                ff_bp[1] = pic_param->bitplane_present.flags.bp_skip_mb   ? s->mbskip_table    : NULL;

                ff_bp[2] = NULL; /* XXX: interlaced frame (FORWARD plane) */

                break;

            }

            /* fall-through (BI-type) */

        case AV_PICTURE_TYPE_I:

            ff_bp[0] = NULL; /* XXX: interlaced frame (FIELDTX plane) */

            ff_bp[1] = pic_param->bitplane_present.flags.bp_ac_pred    ? v->acpred_plane       : NULL;

            ff_bp[2] = pic_param->bitplane_present.flags.bp_overflags  ? v->over_flags_plane   : NULL;

            break;

        default:

            ff_bp[0] = NULL;

            ff_bp[1] = NULL;

            ff_bp[2] = NULL;

            break;

        }



        bitplane = ff_vaapi_alloc_bitplane(vactx, (s->mb_width * s->mb_height + 1) / 2);

        if (!bitplane)

            return -1;



        n = 0;

        for (y = 0; y < s->mb_height; y++)

            for (x = 0; x < s->mb_width; x++, n++)

                vc1_pack_bitplanes(bitplane, n, ff_bp, x, y, s->mb_stride);

        if (n & 1) /* move last nibble to the high order */

            bitplane[n/2] <<= 4;

    }

    return 0;

}
