synth_i486.c File Reference

#include "mpg123lib_intern.h"

Include dependency graph for synth_i486.c:

Go to the source code of this file.

Macros
#define	FIR16_1(pos, c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15)
#define	FIR16_2(pos1, c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, pos2, d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13, d14, d15)

Functions
int	absynth_1to1_i486 (real *bandPtr, int channel, mpg123_handle *fr, int nb_blocks)

Macro Definition Documentation

FIR16_1

#define FIR16_1	(		pos,
			c0,
			c1,
			c2,
			c3,
			c4,
			c5,
			c6,
			c7,
			c8,
			c9,
			c10,
			c11,
			c12,
			c13,
			c14,
			c15
	)

Value:

{\
  int sum;\
  sum=(c0)*b0[0]+(c1)*b0[1]+(c2)*b0[2]+(c3)*b0[3]+\
  (c4)*b0[4]+(c5)*b0[5]+(c6)*b0[6]+(c7)*b0[7]+\
  (c8)*b0[8]+(c9)*b0[9]+(c10)*b0[10]+(c11)*b0[11]+\
  (c12)*b0[12]+(c13)*b0[13]+(c14)*b0[14]+(c15)*b0[15];\
  sum=(sum+(1 << 13))>>14;\
  if (sum<-32768) sum=-32768;\
  else if (sum>32767) sum=32767;\
  samples[2*(pos)]=sum;\
  b0+=FIR_BUFFER_SIZE;\
}

Definition at line 27 of file synth_i486.c.

FIR16_2

#define FIR16_2	(		pos1,
			c0,
			c1,
			c2,
			c3,
			c4,
			c5,
			c6,
			c7,
			c8,
			c9,
			c10,
			c11,
			c12,
			c13,
			c14,
			c15,
			pos2,
			d0,
			d1,
			d2,
			d3,
			d4,
			d5,
			d6,
			d7,
			d8,
			d9,
			d10,
			d11,
			d12,
			d13,
			d14,
			d15
	)

Definition at line 41 of file synth_i486.c.

Function Documentation

absynth_1to1_i486()

int absynth_1to1_i486	(	real *	bandPtr,
		int	channel,
		mpg123_handle *	fr,
		int	nb_blocks
	)

Definition at line 108 of file synth_i486.c.

{
  short *samples = (short *) (fr->buffer.data+fr->buffer.fill);
  int *b0,**buf;
  int clip = 0;
  int block,b,bo_start;
 
  /* samples address */
  samples+=channel;
 
  bo_start=fr->i486bo[channel];
  buf = fr->int_buffs[channel];
 
  b=bo_start;
  for(block=0;block<nb_blocks;block++) {
 
    /* FIR offset */
    b++;
    if (b >= FIR_BUFFER_SIZE) {
      int *p,*q;
      int c,i,j;
 
      /* we shift the buffers */
      for(c=0;c<2;c++) {
        p=&buf[c][0]+1;
        q=p+(FIR_BUFFER_SIZE-FIR_SIZE);
        for(i=0;i<17;i++) {
          for(j=0;j<FIR_SIZE-1;j++) p[j]=q[j];
          p+=FIR_BUFFER_SIZE;
          q+=FIR_BUFFER_SIZE;
        }
      }
      /* we update 'bo' accordingly */
      b=fr->i486bo[channel]=FIR_SIZE;
    }
 
    if(b & 1) {
      dct64_i486(buf[1]+b,buf[0]+b,bandPtr);
    } else {
      dct64_i486(buf[0]+b,buf[1]+b,bandPtr);
    }
    bandPtr+=32;
  }
  fr->i486bo[channel]=b;
 
  /* filter bank: part 1 */
  b=bo_start;
  for(block=0;block<nb_blocks;block++) {
    b++;
    if (b >= FIR_BUFFER_SIZE) b=FIR_SIZE;
    if(b & 1) {
      b0 = buf[0] + b - (FIR_SIZE-1);
    } else {
      b0 = buf[1] + b - (FIR_SIZE-1);
    }
 
 FIR16_1(0,-7,53,-114,509,-1288,1643,-9372,18759,9372,1643,1288,509,114,53,7,0);
 FIR16_2(1,-6,52,-100,515,-1197,1783,-8910,18748,9834,1489,1379,500,129,54,7,0,
 31,0,-7,54,-129,500,-1379,1489,-9834,18748,8910,1783,1197,515,100,52,6);
 FIR16_2(2,-6,50,-86,520,-1106,1910,-8447,18714,10294,1322,1469,488,145,55,8,0,
 30,0,-8,55,-145,488,-1469,1322,-10294,18714,8447,1910,1106,520,86,50,6);
 FIR16_2(3,-5,49,-73,521,-1015,2023,-7986,18657,10751,1140,1559,473,161,56,9,0,
 29,0,-9,56,-161,473,-1559,1140,-10751,18657,7986,2023,1015,521,73,49,5);
    samples+=64;
  }
  samples-=64*nb_blocks;
 
  /* filter bank: part 2 */
 
  b=bo_start;
  for(block=0;block<nb_blocks;block++) {
    b++;
    if (b >= FIR_BUFFER_SIZE) b=FIR_SIZE;
    if(b & 1) {
      b0 = buf[0] + b - (FIR_SIZE-1) + 4*FIR_BUFFER_SIZE;
    } else {
      b0 = buf[1] + b - (FIR_SIZE-1) + 4*FIR_BUFFER_SIZE;
    }
 
 FIR16_2(4,-4,47,-61,521,-926,2123,-7528,18578,11205,944,1647,455,177,56,10,0,
 28,0,-10,56,-177,455,-1647,944,-11205,18578,7528,2123,926,521,61,47,4);
 FIR16_2(5,-4,45,-49,518,-837,2210,-7072,18477,11654,733,1733,434,194,57,11,0,
 27,0,-11,57,-194,434,-1733,733,-11654,18477,7072,2210,837,518,49,45,4);
 FIR16_2(6,-4,44,-38,514,-751,2284,-6620,18353,12097,509,1817,411,212,57,12,0,
 26,0,-12,57,-212,411,-1817,509,-12097,18353,6620,2284,751,514,38,44,4);
 FIR16_2(7,-3,42,-27,508,-665,2347,-6173,18208,12534,270,1899,383,229,56,13,0,
 25,0,-13,56,-229,383,-1899,270,-12534,18208,6173,2347,665,508,27,42,3);
 
    samples+=64;
  }
  samples-=64*nb_blocks;
 
  /* filter bank: part 3 */
 
  b=bo_start;
  for(block=0;block<nb_blocks;block++) {
    b++;
    if (b >= FIR_BUFFER_SIZE) b=FIR_SIZE;
    if(b & 1) {
      b0 = buf[0] + b - (FIR_SIZE-1) + 8*FIR_BUFFER_SIZE;
    } else {
      b0 = buf[1] + b - (FIR_SIZE-1) + 8*FIR_BUFFER_SIZE;
    }
 
 FIR16_2(8,-3,40,-18,500,-582,2398,-5732,18042,12963,17,1977,353,247,56,14,0,
 24,0,-14,56,-247,353,-1977,17,-12963,18042,5732,2398,582,500,18,40,3);
 FIR16_2(9,-2,38,-9,490,-501,2437,-5297,17855,13383,-249,2052,320,266,55,15,0,
 23,0,-15,55,-266,320,-2052,-249,-13383,17855,5297,2437,501,490,9,38,2);
 FIR16_2(10,-2,36,0,479,-423,2465,-4869,17647,13794,-530,2122,282,284,53,17,0,
 22,0,-17,53,-284,282,-2122,-530,-13794,17647,4869,2465,423,479,0,36,2);
 FIR16_2(11,-2,34,7,467,-347,2483,-4449,17419,14194,-825,2188,242,302,52,18,0,
 21,0,-18,52,-302,242,-2188,-825,-14194,17419,4449,2483,347,467,-7,34,2);
 
    samples+=64;
  }
  samples-=64*nb_blocks;
 
  /* filter bank: part 4 */
 
  b=bo_start;
  for(block=0;block<nb_blocks;block++) {
    b++;
    if (b >= FIR_BUFFER_SIZE) b=FIR_SIZE;
    if(b & 1) {
      b0 = buf[0] + b - (FIR_SIZE-1) + 12*FIR_BUFFER_SIZE;
    } else {
      b0 = buf[1] + b - (FIR_SIZE-1) + 12*FIR_BUFFER_SIZE;
    }
 
 FIR16_2(12,-2,33,14,454,-273,2491,-4038,17173,14583,-1133,2249,198,320,50,19,0,
 20,0,-19,50,-320,198,-2249,-1133,-14583,17173,4038,2491,273,454,-14,33,2);
 FIR16_2(13,-1,31,20,439,-203,2489,-3637,16907,14959,-1454,2304,151,339,47,21,-1,
 19,-1,-21,47,-339,151,-2304,-1454,-14959,16907,3637,2489,203,439,-20,31,1);
 FIR16_2(14,-1,29,26,424,-136,2479,-3245,16623,15322,-1788,2354,100,357,44,22,-1,
 18,-1,-22,44,-357,100,-2354,-1788,-15322,16623,3245,2479,136,424,-26,29,1);
 FIR16_2(15,-1,27,31,408,-72,2459,-2863,16322,15671,-2135,2396,46,374,40,24,-1,
 17,-1,-24,40,-374,46,-2396,-2135,-15671,16322,2863,2459,72,408,-31,27,1);
 FIR16_1(16,-1,0,36,0,-11,0,-2493,0,16004,0,2431,0,391,0,26,0);
 
    samples+=64;
  }
 
  return clip;
}