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libavcodec/bfin/mpegvideo_bfin.c

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00001 /*
00002  * BlackFin MPEGVIDEO OPTIMIZATIONS
00003  *
00004  * Copyright (C) 2007 Marc Hoffman <mmh@pleasantst.com>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "libavcodec/avcodec.h"
00024 #include "libavcodec/dsputil.h"
00025 #include "libavcodec/mpegvideo.h"
00026 #include "dsputil_bfin.h"
00027 
00028 static int dct_quantize_bfin (MpegEncContext *s,
00029                               DCTELEM *block, int n,
00030                               int qscale, int *overflow)
00031 {
00032     int last_non_zero, q, start_i;
00033     const short *qmat;
00034     short *bias;
00035     const uint8_t *scantable= s->intra_scantable.scantable;
00036     short dc;
00037     int   max=0;
00038 
00039     PROF("fdct",0);
00040     s->dsp.fdct(block);
00041     EPROF();
00042 
00043     PROF("denoise",1);
00044     if(s->dct_error_sum)
00045         s->denoise_dct(s, block);
00046     EPROF();
00047 
00048     PROF("quant-init",2);
00049     if (s->mb_intra) {
00050         if (!s->h263_aic) {
00051             if (n < 4)
00052                 q = s->y_dc_scale;
00053             else
00054                 q = s->c_dc_scale;
00055             q = q << 3;
00056         } else
00057             /* For AIC we skip quant/dequant of INTRADC */
00058             q = 1 << 3;
00059 
00060         /* note: block[0] is assumed to be positive */
00061         dc = block[0] = (block[0] + (q >> 1)) / q;
00062         start_i = 1;
00063         last_non_zero = 0;
00064         bias = s->q_intra_matrix16[qscale][1];
00065         qmat = s->q_intra_matrix16[qscale][0];
00066 
00067     } else {
00068         start_i = 0;
00069         last_non_zero = -1;
00070         bias = s->q_inter_matrix16[qscale][1];
00071         qmat = s->q_inter_matrix16[qscale][0];
00072 
00073     }
00074     EPROF();
00075 
00076     PROF("quantize",4);
00077 
00078     /*  for(i=start_i; i<64; i++) {                           */
00079     /*      sign     = (block[i]>>15)|1;                      */
00080     /*      level    = ((abs(block[i])+bias[0])*qmat[i])>>16; */
00081     /*      if (level < 0) level = 0;                         */
00082     /*      max     |= level;                                 */
00083     /*      level    = level * sign;                          */
00084     /*      block[i] = level;                                 */
00085     /*  } */
00086 
00087     __asm__ volatile
00088         ("i2=%1;\n\t"
00089          "r1=[%1++];                                                         \n\t"
00090          "r0=r1>>>15 (v);                                                    \n\t"
00091          "lsetup (0f,1f) lc0=%3;                                             \n\t"
00092          "0:   r0=r0|%4;                                                     \n\t"
00093          "     r1=abs r1 (v)                                    || r2=[%2++];\n\t"
00094          "     r1=r1+|+%5;                                                   \n\t"
00095          "     r1=max(r1,%6) (v);                                            \n\t"
00096          "     r1.h=(a1 =r1.h*r2.h), r1.l=(a0 =r1.l*r2.l) (tfu);             \n\t"
00097          "     %0=%0|r1;                                                     \n\t"
00098          "     r0.h=(a1 =r1.h*r0.h), r0.l=(a0 =r1.l*r0.l) (is)  || r1=[%1++];\n\t"
00099          "1:   r0=r1>>>15 (v)                                   || [i2++]=r0;\n\t"
00100          "r1=%0>>16;                                                         \n\t"
00101          "%0=%0|r1;                                                          \n\t"
00102          "%0.h=0;                                                            \n\t"
00103          : "=&d" (max)
00104          : "b" (block), "b" (qmat), "a" (32), "d" (0x00010001), "d" (bias[0]*0x10001), "d" (0)
00105          : "R0","R1","R2", "I2");
00106     if (start_i == 1) block[0] = dc;
00107 
00108     EPROF();
00109 
00110 
00111     PROF("zzscan",5);
00112 
00113     __asm__ volatile
00114         ("r0=b[%1--] (x);         \n\t"
00115          "lsetup (0f,1f) lc0=%3;  \n\t"     /*    for(i=63; i>=start_i; i--) { */
00116          "0: p0=r0;               \n\t"     /*        j = scantable[i];        */
00117          "   p0=%2+(p0<<1);       \n\t"     /*        if (block[j]) {          */
00118          "   r0=w[p0];            \n\t"     /*           last_non_zero = i;    */
00119          "   cc=r0==0;            \n\t"     /*           break;                */
00120          "   if !cc jump 2f;      \n\t"     /*        }                        */
00121          "1: r0=b[%1--] (x);      \n\t"     /*    }                            */
00122          "   %0=%4;               \n\t"
00123          "   jump 3f;             \n\t"
00124          "2: %0=lc0;              \n\t"
00125          "3:\n\t"
00126 
00127          : "=d" (last_non_zero)
00128          : "a" (scantable+63), "a" (block), "a" (63), "d" (last_non_zero)
00129          : "P0","R0");
00130 
00131     EPROF();
00132 
00133     *overflow= s->max_qcoeff < max; //overflow might have happened
00134 
00135     bfprof();
00136 
00137     /* we need this permutation so that we correct the IDCT, we only permute the !=0 elements */
00138     if (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM)
00139         ff_block_permute(block, s->dsp.idct_permutation, scantable, last_non_zero);
00140 
00141     return last_non_zero;
00142 }
00143 
00144 void MPV_common_init_bfin (MpegEncContext *s)
00145 {
00146 /*     s->dct_quantize= dct_quantize_bfin; */
00147 }
00148 

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