git.sesse.net Git - ffmpeg/blob - libavcodec/bfin/mpegvideo_bfin.c

   1 /*
   2  * BlackFin MPEGVIDEO OPTIMIZATIONS
   3  *
   4  * Copyright (C) 2007 Marc Hoffman <mmh@pleasantst.com>
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * Libav is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "libavcodec/avcodec.h"
  24 #include "libavcodec/dsputil.h"
  25 #include "libavcodec/mpegvideo.h"
  26 #include "dsputil_bfin.h"
  27
  28 static int dct_quantize_bfin (MpegEncContext *s,
  29                               DCTELEM *block, int n,
  30                               int qscale, int *overflow)
  31 {
  32     int last_non_zero, q, start_i;
  33     const short *qmat;
  34     short *bias;
  35     const uint8_t *scantable= s->intra_scantable.scantable;
  36     short dc;
  37     int   max=0;
  38
  39     PROF("fdct",0);
  40     s->dsp.fdct(block);
  41     EPROF();
  42
  43     PROF("denoise",1);
  44     if(s->dct_error_sum)
  45         s->denoise_dct(s, block);
  46     EPROF();
  47
  48     PROF("quant-init",2);
  49     if (s->mb_intra) {
  50         if (!s->h263_aic) {
  51             if (n < 4)
  52                 q = s->y_dc_scale;
  53             else
  54                 q = s->c_dc_scale;
  55             q = q << 3;
  56         } else
  57             /* For AIC we skip quant/dequant of INTRADC */
  58             q = 1 << 3;
  59
  60         /* note: block[0] is assumed to be positive */
  61         dc = block[0] = (block[0] + (q >> 1)) / q;
  62         start_i = 1;
  63         last_non_zero = 0;
  64         bias = s->q_intra_matrix16[qscale][1];
  65         qmat = s->q_intra_matrix16[qscale][0];
  66
  67     } else {
  68         start_i = 0;
  69         last_non_zero = -1;
  70         bias = s->q_inter_matrix16[qscale][1];
  71         qmat = s->q_inter_matrix16[qscale][0];
  72
  73     }
  74     EPROF();
  75
  76     PROF("quantize",4);
  77
  78     /*  for(i=start_i; i<64; i++) {                           */
  79     /*      sign     = (block[i]>>15)|1;                      */
  80     /*      level    = ((abs(block[i])+bias[0])*qmat[i])>>16; */
  81     /*      if (level < 0) level = 0;                         */
  82     /*      max     |= level;                                 */
  83     /*      level    = level * sign;                          */
  84     /*      block[i] = level;                                 */
  85     /*  } */
  86
  87     __asm__ volatile
  88         ("i2=%1;\n\t"
  89          "r1=[%1++];                                                         \n\t"
  90          "r0=r1>>>15 (v);                                                    \n\t"
  91          "lsetup (0f,1f) lc0=%3;                                             \n\t"
  92          "0:   r0=r0|%4;                                                     \n\t"
  93          "     r1=abs r1 (v)                                    || r2=[%2++];\n\t"
  94          "     r1=r1+|+%5;                                                   \n\t"
  95          "     r1=max(r1,%6) (v);                                            \n\t"
  96          "     r1.h=(a1 =r1.h*r2.h), r1.l=(a0 =r1.l*r2.l) (tfu);             \n\t"
  97          "     %0=%0|r1;                                                     \n\t"
  98          "     r0.h=(a1 =r1.h*r0.h), r0.l=(a0 =r1.l*r0.l) (is)  || r1=[%1++];\n\t"
  99          "1:   r0=r1>>>15 (v)                                   || [i2++]=r0;\n\t"
 100          "r1=%0>>16;                                                         \n\t"
 101          "%0=%0|r1;                                                          \n\t"
 102          "%0.h=0;                                                            \n\t"
 103          : "=&d" (max)
 104          : "b" (block), "b" (qmat), "a" (32), "d" (0x00010001), "d" (bias[0]*0x10001), "d" (0)
 105          : "R0","R1","R2", "I2");
 106     if (start_i == 1) block[0] = dc;
 107
 108     EPROF();
 109
 110
 111     PROF("zzscan",5);
 112
 113     __asm__ volatile
 114         ("r0=b[%1--] (x);         \n\t"
 115          "lsetup (0f,1f) lc0=%3;  \n\t"     /*    for(i=63; i>=start_i; i--) { */
 116          "0: p0=r0;               \n\t"     /*        j = scantable[i];        */
 117          "   p0=%2+(p0<<1);       \n\t"     /*        if (block[j]) {          */
 118          "   r0=w[p0];            \n\t"     /*           last_non_zero = i;    */
 119          "   cc=r0==0;            \n\t"     /*           break;                */
 120          "   if !cc jump 2f;      \n\t"     /*        }                        */
 121          "1: r0=b[%1--] (x);      \n\t"     /*    }                            */
 122          "   %0=%4;               \n\t"
 123          "   jump 3f;             \n\t"
 124          "2: %0=lc0;              \n\t"
 125          "3:\n\t"
 126
 127          : "=d" (last_non_zero)
 128          : "a" (scantable+63), "a" (block), "a" (63), "d" (last_non_zero)
 129          : "P0","R0");
 130
 131     EPROF();
 132
 133     *overflow= s->max_qcoeff < max; //overflow might have happened
 134
 135     bfprof();
 136
 137     /* we need this permutation so that we correct the IDCT, we only permute the !=0 elements */
 138     if (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM)
 139         ff_block_permute(block, s->dsp.idct_permutation, scantable, last_non_zero);
 140
 141     return last_non_zero;
 142 }
 143
 144 void MPV_common_init_bfin (MpegEncContext *s)
 145 {
 146 /*     s->dct_quantize= dct_quantize_bfin; */
 147 }
 148