libavcodec/ppc/mpegvideo_ppc.c

   1 /*
   2  * Copyright (c) 2002 Dieter Shirley
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include "../dsputil.h"
  20 #include "../mpegvideo.h"
  21 #include <time.h>
  22
  23 #ifdef HAVE_ALTIVEC
  24 #include "dsputil_altivec.h"
  25 #endif
  26
  27 extern int dct_quantize_altivec(MpegEncContext *s,
  28         DCTELEM *block, int n,
  29         int qscale, int *overflow);
  30
  31 extern void idct_put_altivec(UINT8 *dest, int line_size, INT16 *block);
  32 extern void idct_add_altivec(UINT8 *dest, int line_size, INT16 *block);
  33
  34
  35 void MPV_common_init_ppc(MpegEncContext *s)
  36 {
  37 #if HAVE_ALTIVEC
  38     if (has_altivec())
  39     {
  40         if ((s->avctx->idct_algo == FF_IDCT_AUTO) ||
  41                 (s->avctx->idct_algo == FF_IDCT_ALTIVEC))
  42         {
  43             s->idct_put = idct_put_altivec;
  44             s->idct_add = idct_add_altivec;
  45             s->idct_permutation_type = FF_TRANSPOSE_IDCT_PERM;
  46         }
  47
  48         // Test to make sure that the dct required alignments are met.
  49         if ((((long)(s->q_intra_matrix) & 0x0f) != 0) ||
  50                 (((long)(s->q_inter_matrix) & 0x0f) != 0))
  51         {
  52             fprintf(stderr, "Internal Error: q-matrix blocks must be 16-byte aligned "
  53                     "to use Altivec DCT. Reverting to non-altivec version.\n");
  54             return;
  55         }
  56
  57         if (((long)(s->intra_scantable.inverse) & 0x0f) != 0)
  58         {
  59             fprintf(stderr, "Internal Error: scan table blocks must be 16-byte aligned "
  60                     "to use Altivec DCT. Reverting to non-altivec version.\n");
  61             return;
  62         }
  63
  64
  65         if ((s->avctx->dct_algo == FF_DCT_AUTO) ||
  66                 (s->avctx->dct_algo == FF_DCT_ALTIVEC))
  67         {
  68             s->dct_quantize = dct_quantize_altivec;
  69         }
  70     } else
  71 #endif
  72     {
  73         /* Non-AltiVec PPC optimisations here */
  74     }
  75 }
  76