Function vaapi_mpeg2_start_frame

libavcodec/vaapi_mpeg2.c:42–116

}

static int vaapi_mpeg2_start_frame(AVCodecContext *avctx,
                                   av_unused const AVBufferRef *buffer_ref,
                                   av_unused const uint8_t *buffer,
                                   av_unused uint32_t size)
{
    const MpegEncContext *s = avctx->priv_data;
    VAAPIDecodePicture *pic = s->cur_pic.ptr->hwaccel_picture_private;
    VAPictureParameterBufferMPEG2 pic_param;
    VAIQMatrixBufferMPEG2 iq_matrix;
    int i, err;

    pic->output_surface = ff_vaapi_get_surface_id(s->cur_pic.ptr->f);

    pic_param = (VAPictureParameterBufferMPEG2) {
        .horizontal_size                 = s->width,
        .vertical_size                   = s->height,
        .forward_reference_picture       = VA_INVALID_ID,
        .backward_reference_picture      = VA_INVALID_ID,
        .picture_coding_type             = s->pict_type,
        .f_code                          = mpeg2_get_f_code(s),
        .picture_coding_extension.bits = {
            .intra_dc_precision          = s->intra_dc_precision,
            .picture_structure           = s->picture_structure,
            .top_field_first             = s->top_field_first,
            .frame_pred_frame_dct        = s->frame_pred_frame_dct,
            .concealment_motion_vectors  = s->concealment_motion_vectors,
            .q_scale_type                = s->q_scale_type,
            .intra_vlc_format            = s->intra_vlc_format,
            .alternate_scan              = s->alternate_scan,
            .repeat_first_field          = s->repeat_first_field,
            .progressive_frame           = s->progressive_frame,
            .is_first_field              = mpeg2_get_is_frame_start(s),
        },
    };

    switch (s->pict_type) {
    case AV_PICTURE_TYPE_B:
        pic_param.backward_reference_picture = ff_vaapi_get_surface_id(s->next_pic.ptr->f);
        // fall-through
    case AV_PICTURE_TYPE_P:
        pic_param.forward_reference_picture = ff_vaapi_get_surface_id(s->last_pic.ptr->f);
        break;
    }

    err = ff_vaapi_decode_make_param_buffer(avctx, pic,
                                            VAPictureParameterBufferType,
                                            &pic_param, sizeof(pic_param));
    if (err < 0)
        goto fail;

    iq_matrix.load_intra_quantiser_matrix              = 1;
    iq_matrix.load_non_intra_quantiser_matrix          = 1;
    iq_matrix.load_chroma_intra_quantiser_matrix       = 1;
    iq_matrix.load_chroma_non_intra_quantiser_matrix   = 1;

    for (i = 0; i < 64; i++) {
        int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
        iq_matrix.intra_quantiser_matrix[i]            = s->intra_matrix[n];