text: /*
   * BlackFin MPEGVIDEO OPTIMIZATIONS
   *
   * Copyright (C) 2007 Marc Hoffman <mmh@pleasantst.com>
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include "libavcodec/avcodec.h"
  #include "libavcodec/dsputil.h"
  #include "libavcodec/mpegvideo.h"
  #include "dsputil_bfin.h"
  
  
  void ff_bfin_fdct (DCTELEM *block) attribute_l1_text;
  
  
  static int dct_quantize_bfin (MpegEncContext *s,
                                DCTELEM *block, int n,
                                int qscale, int *overflow)
  {
      int last_non_zero, q, start_i;
      const short *qmat;
      short *bias;
      const uint8_t *scantable= s->intra_scantable.scantable;
      short dc;
      int   max=0;
  
      PROF("fdct",0);
      ff_bfin_fdct (block);
      EPROF();
  
      PROF("denoise",1);
      if(s->dct_error_sum)
          s->denoise_dct(s, block);
      EPROF();
  
      PROF("quant-init",2);
      if (s->mb_intra) {
          if (!s->h263_aic) {
              if (n < 4)
                  q = s->y_dc_scale;
              else
                  q = s->c_dc_scale;
              q = q << 3;
          } else
              /* For AIC we skip quant/dequant of INTRADC */
              q = 1 << 3;
  
          /* note: block[0] is assumed to be positive */
          dc = block[0] = (block[0] + (q >> 1)) / q;
          start_i = 1;
          last_non_zero = 0;
          bias = s->q_intra_matrix16[qscale][1];
          qmat = s->q_intra_matrix16[qscale][0];
  
      } else {
          start_i = 0;
          last_non_zero = -1;
          bias = s->q_inter_matrix16[qscale][1];
          qmat = s->q_inter_matrix16[qscale][0];
  
      }
      EPROF();
  
      PROF("quantize",4);
  
      /*  for(i=start_i; i<64; i++) {                           */
      /*      sign     = (block[i]>>15)|1;                      */
      /*      level    = ((abs(block[i])+bias[0])*qmat[i])>>16; */
      /*      if (level < 0) level = 0;                         */
      /*      max     |= level;                                 */
      /*      level    = level * sign;                          */
      /*      block[i] = level;                                 */
      /*  } */
  
      __asm__ volatile
          ("i2=%1;\n\t"
           "r1=[%1++];                                                         \n\t"
           "r0=r1>>>15 (v);                                                    \n\t"
           "lsetup (0f,1f) lc0=%3;                                             \n\t"
           "0:   r0=r0|%4;                                                     \n\t"
           "     r1=abs r1 (v)                                    || r2=[%2++];\n\t"
           "     r1=r1+|+%5;                                                   \n\t"
           "     r1=max(r1,%6) (v);                                            \n\t"
           "     r1.h=(a1 =r1.h*r2.h), r1.l=(a0 =r1.l*r2.l) (tfu);             \n\t"
           "     %0=%0|r1;                                                     \n\t"
           "     r0.h=(a1 =r1.h*r0.h), r0.l=(a0 =r1.l*r0.l) (is)  || r1=[%1++];\n\t"
           "1:   r0=r1>>>15 (v)                                   || [i2++]=r0;\n\t"
           "r1=%0>>16;                                                         \n\t"
           "%0=%0|r1;                                                          \n\t"
           "%0.h=0;                                                            \n\t"
           : "=&d" (max)
           : "b" (block), "b" (qmat), "a" (32), "d" (0x00010001), "d" (bias[0]*0x10001), "d" (0)
           : "R0","R1","R2", "I2");
      if (start_i == 1) block[0] = dc;
  
      EPROF();
  
  
      PROF("zzscan",5);
  
      __asm__ volatile
          ("r0=b[%1--] (x);         \n\t"
           "lsetup (0f,1f) lc0=%3;  \n\t"     /*    for(i=63; i>=start_i; i--) { */
           "0: p0=r0;               \n\t"     /*        j = scantable[i];        */
           "   p0=%2+(p0<<1);       \n\t"     /*        if (block[j]) {          */
           "   r0=w[p0];            \n\t"     /*           last_non_zero = i;    */
           "   cc=r0==0;            \n\t"     /*           break;                */
           "   if !cc jump 2f;      \n\t"     /*        }                        */
           "1: r0=b[%1--] (x);      \n\t"     /*    }                            */
           "   %0=%4;               \n\t"
           "   jump 3f;             \n\t"
           "2: %0=lc0;              \n\t"
           "3:\n\t"
  
           : "=d" (last_non_zero)
           : "a" (scantable+63), "a" (block), "a" (63), "d" (last_non_zero)
           : "P0","R0");
  
      EPROF();
  
      *overflow= s->max_qcoeff < max; //overflow might have happened
  
      bfprof();
  
      /* we need this permutation so that we correct the IDCT, we only permute the !=0 elements */
      if (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM)
          ff_block_permute(block, s->dsp.idct_permutation, scantable, last_non_zero);
  
      return last_non_zero;
  }
  
  void MPV_common_init_bfin (MpegEncContext *s)
  {
      s->dct_quantize= dct_quantize_bfin;
  }
  
  