}
void MPV_common_init_ppc(MpegEncContext *s){#ifdef HAVE_ALTIVEC    if (has_altivec())    {        if ((s->avctx->idct_algo == FF_IDCT_AUTO) ||                (s->avctx->idct_algo == FF_IDCT_ALTIVEC))        {            s->dsp.idct_put = idct_put_altivec;            s->dsp.idct_add = idct_add_altivec;#ifndef ALTIVEC_USE_REFERENCE_C_CODE            s->dsp.idct_permutation_type = FF_TRANSPOSE_IDCT_PERM;#else /* ALTIVEC_USE_REFERENCE_C_CODE */            s->dsp.idct_permutation_type = FF_NO_IDCT_PERM;#endif /* ALTIVEC_USE_REFERENCE_C_CODE */        }        // Test to make sure that the dct required alignments are met.        if ((((long)(s->q_intra_matrix) & 0x0f) != 0) ||                (((long)(s->q_inter_matrix) & 0x0f) != 0))        {            av_log(s->avctx, AV_LOG_INFO, "Internal Error: q-matrix blocks must be 16-byte aligned "                    "to use Altivec DCT. Reverting to non-altivec version.\n");            return;        }        if (((long)(s->intra_scantable.inverse) & 0x0f) != 0)        {            av_log(s->avctx, AV_LOG_INFO, "Internal Error: scan table blocks must be 16-byte aligned "                    "to use Altivec DCT. Reverting to non-altivec version.\n");            return;        }        if ((s->avctx->dct_algo == FF_DCT_AUTO) ||                (s->avctx->dct_algo == FF_DCT_ALTIVEC))        {#if 0 /* seems to cause trouble under some circumstances */            s->dct_quantize = dct_quantize_altivec;#endif            s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec;            s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec;        }    } else#endif    {        /* Non-AltiVec PPC optimisations here */    }}