layer3.c

mips上编译过的mpg 运行正常 环境：AU12

/*
	leyer3.c: the layer 3 decoder

	copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
	see COPYING and AUTHORS files in distribution or http://mpg123.org
	initially written by Michael Hipp

	Optimize-TODO: put short bands into the band-field without the stride of 3 reals
	Length-optimze: unify long and short band code where it is possible

	The int-vs-pointer situation has to be cleaned up.
*/

#include "mpg123lib_intern.h"
#include "huffman.h"
#include "getbits.h"
#include "debug.h"

/* static one-time calculated tables... or so */
static real ispow[8207];
static real aa_ca[8],aa_cs[8];
static real COS1[12][6];
static real win[4][36];
static real win1[4][36];
real COS9[9]; /* dct36_3dnow wants to use that */
static real COS6_1,COS6_2;
real tfcos36[9]; /* dct36_3dnow wants to use that */
static real tfcos12[3];
#define NEW_DCT9
#ifdef NEW_DCT9
static real cos9[3],cos18[3];
#endif

struct gr_info_s {
      int scfsi;
      unsigned part2_3_length;
      unsigned big_values;
      unsigned scalefac_compress;
      unsigned block_type;
      unsigned mixed_block_flag;
      unsigned table_select[3];
      unsigned subblock_gain[3];
      unsigned maxband[3];
      unsigned maxbandl;
      unsigned maxb;
      unsigned region1start;
      unsigned region2start;
      unsigned preflag;
      unsigned scalefac_scale;
      unsigned count1table_select;
      real *full_gain[3];
      real *pow2gain;
};

struct III_sideinfo
{
  unsigned main_data_begin;
  unsigned private_bits;
  struct {
    struct gr_info_s gr[2];
  } ch[2];
};


struct bandInfoStruct {
  int longIdx[23];
  int longDiff[22];
  int shortIdx[14];
  int shortDiff[13];
};


const struct bandInfoStruct bandInfo[9] = { 

/* MPEG 1.0 */
 { {0,4,8,12,16,20,24,30,36,44,52,62,74, 90,110,134,162,196,238,288,342,418,576},
   {4,4,4,4,4,4,6,6,8, 8,10,12,16,20,24,28,34,42,50,54, 76,158},
   {0,4*3,8*3,12*3,16*3,22*3,30*3,40*3,52*3,66*3, 84*3,106*3,136*3,192*3},
   {4,4,4,4,6,8,10,12,14,18,22,30,56} } ,

 { {0,4,8,12,16,20,24,30,36,42,50,60,72, 88,106,128,156,190,230,276,330,384,576},
   {4,4,4,4,4,4,6,6,6, 8,10,12,16,18,22,28,34,40,46,54, 54,192},
   {0,4*3,8*3,12*3,16*3,22*3,28*3,38*3,50*3,64*3, 80*3,100*3,126*3,192*3},
   {4,4,4,4,6,6,10,12,14,16,20,26,66} } ,

 { {0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576} ,
   {4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102, 26} ,
   {0,4*3,8*3,12*3,16*3,22*3,30*3,42*3,58*3,78*3,104*3,138*3,180*3,192*3} ,
   {4,4,4,4,6,8,12,16,20,26,34,42,12} }  ,

/* MPEG 2.0 */
 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
   {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 } ,
   {0,4*3,8*3,12*3,18*3,24*3,32*3,42*3,56*3,74*3,100*3,132*3,174*3,192*3} ,
   {4,4,4,6,6,8,10,14,18,26,32,42,18 } } ,

/* Twiddling 3 values here (not just 330->332!) fixed bug 1895025. */
 { {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,332,394,464,540,576},
   {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,54,62,70,76,36 } ,
   {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,136*3,180*3,192*3} ,
   {4,4,4,6,8,10,12,14,18,24,32,44,12 } } ,

 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
   {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 },
   {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,134*3,174*3,192*3},
   {4,4,4,6,8,10,12,14,18,24,30,40,18 } } ,
/* MPEG 2.5 */
 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
   {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
   {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
   {4,4,4,6,8,10,12,14,18,24,30,40,18} },
 { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
   {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
   {0,12,24,36,54,78,108,144,186,240,312,402,522,576},
   {4,4,4,6,8,10,12,14,18,24,30,40,18} },
 { {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576},
   {12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2},
   {0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576},
   {8,8,8,12,16,20,24,28,36,2,2,2,26} } ,
};

static int mapbuf0[9][152];
static int mapbuf1[9][156];
static int mapbuf2[9][44];
static int *map[9][3];
static int *mapend[9][3];

static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */
static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */

static real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16];
static real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16];

#ifdef OPT_MMXORSSE
real init_layer3_gainpow2_mmx(mpg123_handle *fr, int i)
{
	if(!fr->p.down_sample) return 16384.0 * pow((double)2.0,-0.25 * (double) (i+210) );
	else return DOUBLE_TO_REAL(pow((double)2.0,-0.25 * (double) (i+210)));
}
#endif

real init_layer3_gainpow2(mpg123_handle *fr, int i)
{
	return DOUBLE_TO_REAL(pow((double)2.0,-0.25 * (double) (i+210)));
}

/* 
 * init tables for layer-3 ... specific with the downsampling...
 */
void init_layer3(void)
{
  int i,j,k,l;

  for(i=0;i<8207;i++)
    ispow[i] = DOUBLE_TO_REAL(pow((double)i,(double)4.0/3.0));

  for (i=0;i<8;i++) {
    const double Ci[8]={-0.6,-0.535,-0.33,-0.185,-0.095,-0.041,-0.0142,-0.0037};
    double sq=sqrt(1.0+Ci[i]*Ci[i]);
    aa_cs[i] = DOUBLE_TO_REAL(1.0/sq);
    aa_ca[i] = DOUBLE_TO_REAL(Ci[i]/sq);
  }

  for(i=0;i<18;i++) {
    win[0][i]    = win[1][i]    = DOUBLE_TO_REAL(0.5 * sin( M_PI / 72.0 * (double) (2*(i+0) +1) ) / cos ( M_PI * (double) (2*(i+0) +19) / 72.0 ));
    win[0][i+18] = win[3][i+18] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 72.0 * (double) (2*(i+18)+1) ) / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 ));
  }
  for(i=0;i<6;i++) {
    win[1][i+18] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 ));
    win[3][i+12] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (2*(i+12)+19) / 72.0 ));
    win[1][i+24] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 24.0 * (double) (2*i+13) ) / cos ( M_PI * (double) (2*(i+24)+19) / 72.0 ));
    win[1][i+30] = win[3][i] = DOUBLE_TO_REAL(0.0);
    win[3][i+6 ] = DOUBLE_TO_REAL(0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*(i+6 )+19) / 72.0 ));
  }

  for(i=0;i<9;i++)
    COS9[i] = DOUBLE_TO_REAL(cos( M_PI / 18.0 * (double) i));

  for(i=0;i<9;i++)
    tfcos36[i] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (i*2+1) / 36.0 ));
  for(i=0;i<3;i++)
    tfcos12[i] = DOUBLE_TO_REAL(0.5 / cos ( M_PI * (double) (i*2+1) / 12.0 ));

  COS6_1 = DOUBLE_TO_REAL(cos( M_PI / 6.0 * (double) 1));
  COS6_2 = DOUBLE_TO_REAL(cos( M_PI / 6.0 * (double) 2));

#ifdef NEW_DCT9
  cos9[0]  = DOUBLE_TO_REAL(cos(1.0*M_PI/9.0));
  cos9[1]  = DOUBLE_TO_REAL(cos(5.0*M_PI/9.0));
  cos9[2]  = DOUBLE_TO_REAL(cos(7.0*M_PI/9.0));
  cos18[0] = DOUBLE_TO_REAL(cos(1.0*M_PI/18.0));
  cos18[1] = DOUBLE_TO_REAL(cos(11.0*M_PI/18.0));
  cos18[2] = DOUBLE_TO_REAL(cos(13.0*M_PI/18.0));
#endif

  for(i=0;i<12;i++) {
    win[2][i]  = DOUBLE_TO_REAL(0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*i+7) / 24.0 ));
    for(j=0;j<6;j++)
      COS1[i][j] = DOUBLE_TO_REAL(cos( M_PI / 24.0 * (double) ((2*i+7)*(2*j+1)) ));
  }

  for(j=0;j<4;j++) {
    const int len[4] = { 36,36,12,36 };
    for(i=0;i<len[j];i+=2)
      win1[j][i] = + win[j][i];
    for(i=1;i<len[j];i+=2)
      win1[j][i] = - win[j][i];
  }

  for(i=0;i<16;i++) {
    double t = tan( (double) i * M_PI / 12.0 );
    tan1_1[i] = DOUBLE_TO_REAL(t / (1.0+t));
    tan2_1[i] = DOUBLE_TO_REAL(1.0 / (1.0 + t));
    tan1_2[i] = DOUBLE_TO_REAL(M_SQRT2 * t / (1.0+t));
    tan2_2[i] = DOUBLE_TO_REAL(M_SQRT2 / (1.0 + t));

    for(j=0;j<2;j++) {
      double base = pow(2.0,-0.25*(j+1.0));
      double p1=1.0,p2=1.0;
      if(i > 0) {
        if( i & 1 )
          p1 = pow(base,(i+1.0)*0.5);
        else
          p2 = pow(base,i*0.5);
      }
      pow1_1[j][i] = DOUBLE_TO_REAL(p1);
      pow2_1[j][i] = DOUBLE_TO_REAL(p2);
      pow1_2[j][i] = DOUBLE_TO_REAL(M_SQRT2 * p1);
      pow2_2[j][i] = DOUBLE_TO_REAL(M_SQRT2 * p2);
    }
  }

  for(j=0;j<9;j++) {
   const struct bandInfoStruct *bi = &bandInfo[j];
   int *mp;
   int cb,lwin;
   const int *bdf;

   mp = map[j][0] = mapbuf0[j];
   bdf = bi->longDiff;
   for(i=0,cb = 0; cb < 8 ; cb++,i+=*bdf++) {
     *mp++ = (*bdf) >> 1;
     *mp++ = i;
     *mp++ = 3;
     *mp++ = cb;
   }
   bdf = bi->shortDiff+3;
   for(cb=3;cb<13;cb++) {
     int l = (*bdf++) >> 1;
     for(lwin=0;lwin<3;lwin++) {
       *mp++ = l;
       *mp++ = i + lwin;
       *mp++ = lwin;
       *mp++ = cb;
     }
     i += 6*l;
   }
   mapend[j][0] = mp;

   mp = map[j][1] = mapbuf1[j];
   bdf = bi->shortDiff+0;
   for(i=0,cb=0;cb<13;cb++) {
     int l = (*bdf++) >> 1;
     for(lwin=0;lwin<3;lwin++) {
       *mp++ = l;
       *mp++ = i + lwin;
       *mp++ = lwin;
       *mp++ = cb;
     }
     i += 6*l;
   }
   mapend[j][1] = mp;

   mp = map[j][2] = mapbuf2[j];
   bdf = bi->longDiff;
   for(cb = 0; cb < 22 ; cb++) {
     *mp++ = (*bdf++) >> 1;
     *mp++ = cb;
   }
   mapend[j][2] = mp;

  }

  for(i=0;i<5;i++) {
    for(j=0;j<6;j++) {
      for(k=0;k<6;k++) {
        int n = k + j * 6 + i * 36;
        i_slen2[n] = i|(j<<3)|(k<<6)|(3<<12);
      }
    }
  }
  for(i=0;i<4;i++) {
    for(j=0;j<4;j++) {
      for(k=0;k<4;k++) {
        int n = k + j * 4 + i * 16;
        i_slen2[n+180] = i|(j<<3)|(k<<6)|(4<<12);
      }
    }
  }
  for(i=0;i<4;i++) {
    for(j=0;j<3;j++) {
      int n = j + i * 3;
      i_slen2[n+244] = i|(j<<3) | (5<<12);
      n_slen2[n+500] = i|(j<<3) | (2<<12) | (1<<15);
    }
  }

  for(i=0;i<5;i++) {
    for(j=0;j<5;j++) {
      for(k=0;k<4;k++) {
        for(l=0;l<4;l++) {
          int n = l + k * 4 + j * 16 + i * 80;
          n_slen2[n] = i|(j<<3)|(k<<6)|(l<<9)|(0<<12);
        }
      }
    }
  }
  for(i=0;i<5;i++) {
    for(j=0;j<5;j++) {
      for(k=0;k<4;k++) {
        int n = k + j * 4 + i * 20;
        n_slen2[n+400] = i|(j<<3)|(k<<6)|(1<<12);
      }
    }
  }
}

void init_layer3_stuff(mpg123_handle *fr)
{
	int i,j;

	for(i=-256;i<118+4;i++)	fr->gainpow2[i+256] = opt_init_layer3_gainpow2(fr)(fr,i);

	for(j=0;j<9;j++)
	{
		for(i=0;i<23;i++)
		{
			fr->longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1;
			if(fr->longLimit[j][i] > (fr->down_sample_sblimit) )
			fr->longLimit[j][i] = fr->down_sample_sblimit;
		}
		for(i=0;i<14;i++)
		{
			fr->shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
			if(fr->shortLimit[j][i] > (fr->down_sample_sblimit) )
			fr->shortLimit[j][i] = fr->down_sample_sblimit;
		}
	}
}


/*
 * read additional side information (for MPEG 1 and MPEG 2)
 */
static int III_get_side_info(mpg123_handle *fr, struct III_sideinfo *si,int stereo,
 int ms_stereo,long sfreq,int single)
{
   int ch, gr;
   int powdiff = (single == SINGLE_MIX) ? 4 : 0;

   const int tabs[2][5] = { { 2,9,5,3,4 } , { 1,8,1,2,9 } };
   const int *tab = tabs[fr->lsf];
   
   si->main_data_begin = getbits(fr, tab[1]);
   if (stereo == 1)
     si->private_bits = getbits_fast(fr, tab[2]);
   else 
     si->private_bits = getbits_fast(fr, tab[3]);

   if(!fr->lsf) {
     for (ch=0; ch<stereo; ch++) {
         si->ch[ch].gr[0].scfsi = -1;
         si->ch[ch].gr[1].scfsi = getbits_fast(fr, 4);
     }
   }

   for (gr=0; gr<tab[0]; gr++) {
     for (ch=0; ch<stereo; ch++) {
       register struct gr_info_s *gr_info = &(si->ch[ch].gr[gr]);

       gr_info->part2_3_length = getbits(fr, 12);
       gr_info->big_values = getbits(fr, 9);
       if(gr_info->big_values > 288) {
          error("big_values too large!");
          gr_info->big_values = 288;
       }
       gr_info->pow2gain = fr->gainpow2+256 - getbits_fast(fr, 8) + powdiff;
       if(ms_stereo)
         gr_info->pow2gain += 2;
       gr_info->scalefac_compress = getbits(fr, tab[4]);

       if(get1bit(fr)) { /* window switch flag  */
         int i;
         gr_info->block_type       = getbits_fast(fr, 2);
         gr_info->mixed_block_flag = get1bit(fr);
         gr_info->table_select[0]  = getbits_fast(fr, 5);
         gr_info->table_select[1]  = getbits_fast(fr, 5);
         /*
          * table_select[2] not needed, because there is no region2,
          * but to satisfy some verifications tools we set it either.
          */
         gr_info->table_select[2] = 0;
         for(i=0;i<3;i++)
           gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(fr, 3)<<3);

         if(gr_info->block_type == 0) {
           error("Blocktype == 0 and window-switching == 1 not allowed.");
           /* exit(1); */
           return 1;
         }
      
         /* region_count/start parameters are implicit in this case. */       
         if( (!fr->lsf || (gr_info->block_type == 2)) && !fr->mpeg25)
         {
           gr_info->region1start = 36>>1;
           gr_info->region2start = 576>>1;
         }
         else {
           if(fr->mpeg25) { 
             int r0c,r1c;
             if((gr_info->block_type == 2) && (!gr_info->mixed_block_flag) ) 
               r0c = 5;
             else 
               r0c = 7;
             r1c = 20 - r0c;
             gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
             gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1; 
           }
           else {
             gr_info->region1start = 54>>1;
             gr_info->region2start = 576>>1; 
           } 
         }

       }
       else {
         int i,r0c,r1c;
         for (i=0; i<3; i++)
           gr_info->table_select[i] = getbits_fast(fr, 5);
         r0c = getbits_fast(fr, 4);
         r1c = getbits_fast(fr, 3);
         gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ;
         gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
         if(r0c + r1c + 2 > 22)
           gr_info->region2start = 576>>1;
         else
           gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
         gr_info->block_type = 0;
         gr_info->mixed_block_flag = 0;
       }
       if(!fr->lsf)
         gr_info->preflag = get1bit(fr);
       gr_info->scalefac_scale = get1bit(fr);
       gr_info->count1table_select = get1bit(fr);
     }
   }
   return 0;
}

/*
 * read scalefactors
 */
static int III_get_scale_factors_1(mpg123_handle *fr, int *scf,struct gr_info_s *gr_info,int ch,int gr)
{
   const unsigned char slen[2][16] = {
     {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
     {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
   };
   int numbits;
   int num0 = slen[0][gr_info->scalefac_compress];
   int num1 = slen[1][gr_info->scalefac_compress];