func: static int vdpau_mpeg_start_frame(AVCodecContext *avctx,
  
                                    const uint8_t *buffer, uint32_t size)
  
  {
  
      MpegEncContext * const s = avctx->priv_data;
  
      Picture *pic             = s->current_picture_ptr;
  
      struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
  
      VdpPictureInfoMPEG1Or2 *info = &pic_ctx->info.mpeg;
  
      VdpVideoSurface ref;
  
      int i;
  
  
  
      /* fill VdpPictureInfoMPEG1Or2 struct */
  
      info->forward_reference  = VDP_INVALID_HANDLE;
  
      info->backward_reference = VDP_INVALID_HANDLE;
  
  
  
      switch (s->pict_type) {
  
      case AV_PICTURE_TYPE_B:
  
          ref = ff_vdpau_get_surface_id(&s->next_picture.f);
  
          assert(ref != VDP_INVALID_HANDLE);
  
          info->backward_reference = ref;
  
          /* fall through to forward prediction */
  
      case AV_PICTURE_TYPE_P:
  
          ref = ff_vdpau_get_surface_id(&s->last_picture.f);
  
          info->forward_reference  = ref;
  
      }
  
  
  
      info->slice_count                = 0;
  
      info->picture_structure          = s->picture_structure;
  
      info->picture_coding_type        = s->pict_type;
  
      info->intra_dc_precision         = s->intra_dc_precision;
  
      info->frame_pred_frame_dct       = s->frame_pred_frame_dct;
  
      info->concealment_motion_vectors = s->concealment_motion_vectors;
  
      info->intra_vlc_format           = s->intra_vlc_format;
  
      info->alternate_scan             = s->alternate_scan;
  
      info->q_scale_type               = s->q_scale_type;
  
      info->top_field_first            = s->top_field_first;
  
      // Both for MPEG-1 only, zero for MPEG-2:
  
      info->full_pel_forward_vector    = s->full_pel[0];
  
      info->full_pel_backward_vector   = s->full_pel[1];
  
      // For MPEG-1 fill both horizontal & vertical:
  
      info->f_code[0][0]               = s->mpeg_f_code[0][0];
  
      info->f_code[0][1]               = s->mpeg_f_code[0][1];
  
      info->f_code[1][0]               = s->mpeg_f_code[1][0];
  
      info->f_code[1][1]               = s->mpeg_f_code[1][1];
  
      for (i = 0; i < 64; ++i) {
  
          info->intra_quantizer_matrix[i]     = s->intra_matrix[i];
  
          info->non_intra_quantizer_matrix[i] = s->inter_matrix[i];
  
      }
  
  
  
      return ff_vdpau_common_start_frame(pic_ctx, buffer, size);
  
  }
  