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ffmpeg / libavcodec / ppc / mpegvideo_ppc.c @ 5509bffa

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/*
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 * Copyright (c) 2002 Dieter Shirley
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "../dsputil.h"
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#include "../mpegvideo.h"
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#include <time.h>
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#ifdef HAVE_ALTIVEC
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#include "dsputil_altivec.h"
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#endif
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extern int dct_quantize_altivec(MpegEncContext *s,
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        DCTELEM *block, int n,
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        int qscale, int *overflow);
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extern void dct_unquantize_h263_altivec(MpegEncContext *s,
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                                        DCTELEM *block, int n, int qscale);
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extern void idct_put_altivec(uint8_t *dest, int line_size, int16_t *block);
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extern void idct_add_altivec(uint8_t *dest, int line_size, int16_t *block);
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void MPV_common_init_ppc(MpegEncContext *s)
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{
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#ifdef HAVE_ALTIVEC
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    if (has_altivec())
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    {
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      if (s->avctx->lowres==0)
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      {
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        if ((s->avctx->idct_algo == FF_IDCT_AUTO) ||
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                (s->avctx->idct_algo == FF_IDCT_ALTIVEC))
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        {
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            s->dsp.idct_put = idct_put_altivec;
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            s->dsp.idct_add = idct_add_altivec;
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#ifndef ALTIVEC_USE_REFERENCE_C_CODE
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            s->dsp.idct_permutation_type = FF_TRANSPOSE_IDCT_PERM;
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#else /* ALTIVEC_USE_REFERENCE_C_CODE */
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            s->dsp.idct_permutation_type = FF_NO_IDCT_PERM;
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#endif /* ALTIVEC_USE_REFERENCE_C_CODE */
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        }
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      }
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        // Test to make sure that the dct required alignments are met.
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        if ((((long)(s->q_intra_matrix) & 0x0f) != 0) ||
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                (((long)(s->q_inter_matrix) & 0x0f) != 0))
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        {
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            av_log(s->avctx, AV_LOG_INFO, "Internal Error: q-matrix blocks must be 16-byte aligned "
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                    "to use Altivec DCT. Reverting to non-altivec version.\n");
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            return;
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        }
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        if (((long)(s->intra_scantable.inverse) & 0x0f) != 0)
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        {
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            av_log(s->avctx, AV_LOG_INFO, "Internal Error: scan table blocks must be 16-byte aligned "
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                    "to use Altivec DCT. Reverting to non-altivec version.\n");
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            return;
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        }
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        if ((s->avctx->dct_algo == FF_DCT_AUTO) ||
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                (s->avctx->dct_algo == FF_DCT_ALTIVEC))
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        {
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#if 0 /* seems to cause trouble under some circumstances */
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            s->dct_quantize = dct_quantize_altivec;
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#endif
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            s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec;
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            s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec;
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        }
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    } else
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#endif
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    {
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        /* Non-AltiVec PPC optimisations here */
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    }
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}
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