quicktime/ffmpeg/libavcodec/ps2/mpegvideo_mmi.c

   1 /*
   2  * Copyright (c) 2000,2001 Fabrice Bellard.
   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  * MMI optimization by Leon van Stuivenberg
  19  */
  20
  21 #include "../dsputil.h"
  22 #include "../mpegvideo.h"
  23 #include "../avcodec.h"
  24
  25 static void dct_unquantize_h263_mmi(MpegEncContext *s,
  26                                   DCTELEM *block, int n, int qscale)
  27 {
  28     int level=0, qmul, qadd;
  29     int nCoeffs;
  30
  31     assert(s->block_last_index[n]>=0);
  32
  33     qadd = (qscale - 1) | 1;
  34     qmul = qscale << 1;
  35
  36     if (s->mb_intra) {
  37         if (!s->h263_aic) {
  38             if (n < 4)
  39                 level = block[0] * s->y_dc_scale;
  40             else
  41                 level = block[0] * s->c_dc_scale;
  42         }else {
  43             qadd = 0;
  44             level = block[0];
  45         }
  46         nCoeffs= 63; //does not allways use zigzag table
  47     } else {
  48         nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
  49     }
  50
  51     asm volatile(
  52         "add    $14, $0, %3     \n\t"
  53         "pcpyld $8, %0, %0      \n\t"
  54         "pcpyh  $8, $8          \n\t"   //r8 = qmul
  55         "pcpyld $9, %1, %1      \n\t"
  56         "pcpyh  $9, $9          \n\t"   //r9 = qadd
  57         ".p2align 2             \n\t"
  58         "1:                     \n\t"
  59         "lq     $10, 0($14)     \n\t"   //r10 = level
  60         "addi   $14, $14, 16    \n\t"   //block+=8
  61         "addi   %2, %2, -8      \n\t"
  62         "pcgth  $11, $0, $10    \n\t"   //r11 = level < 0 ? -1 : 0
  63         "pcgth  $12, $10, $0    \n\t"   //r12 = level > 0 ? -1 : 0
  64         "por    $12, $11, $12   \n\t"
  65         "pmulth $10, $10, $8    \n\t"
  66         "paddh  $13, $9, $11    \n\t"
  67         "pxor   $13, $13, $11   \n\t"   //r13 = level < 0 ? -qadd : qadd
  68         "pmfhl.uw $11           \n\t"
  69         "pinteh $10, $11, $10   \n\t"   //r10 = level * qmul
  70         "paddh  $10, $10, $13   \n\t"
  71         "pand   $10, $10, $12   \n\t"
  72         "sq     $10, -16($14)   \n\t"
  73         "bgez   %2, 1b          \n\t"
  74         :: "r"(qmul), "r" (qadd), "r" (nCoeffs), "r" (block) : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "memory" );
  75
  76     if(s->mb_intra)
  77         block[0]= level;
  78 }
  79
  80
  81 void MPV_common_init_mmi(MpegEncContext *s)
  82 {
  83     s->dct_unquantize_h263_intra =
  84     s->dct_unquantize_h263_inter = dct_unquantize_h263_mmi;
  85 }
  86
  87