/
encoder.c
549 lines (426 loc) · 14 KB
/
encoder.c
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#include <stdio.h>
int prlev = 0 ;
main ( )
{
int band = 0 ;
int xlow, ilow, dlowt;
int slow = 0 ;
int detlow = 32 ;
int block1l(), block2l(), block3l(), block4l() ;
int xhigh, ihigh, dhigh;
int shigh = 0 ;
int dethigh = 8 ;
int block1h(), block2h(), block3h(), block4h() ;
char ch = ' ';
FILE *infile;
FILE *outfile;
printf("%16c bands: 0: Both, \n %22c 1: Low only, \n %22c", ch,ch,ch);
printf(" 2: High only. \n");
printf("Type bands code \n");
scanf ("%d", &band ) ;
infile = fopen("testin.dat", "r");
outfile = fopen("adpcm.dat", "w+");
next: if (band == 2) goto high ;
low: fscanf (infile, "%d", &xlow) ; /*input low band pcm*/
if (xlow == 32767) goto finish ;
ilow = block1l (xlow, slow, detlow) ; /*low band encoder */
dlowt = block2l (ilow, detlow) ;
detlow = block3l (ilow) ;
slow = block4l (dlowt) ;
fprintf (outfile, "%o ", ilow) ; /*output low band code*/
if (prlev > 0)
printf ("MAIN LOW ilow=%5d, dlowt=%5d, detlow=%5d, slow=%5d\n",
ilow, dlowt, detlow, slow) ;
if (band == 1) goto newln ;
high: fscanf (infile, "%d", &xhigh) ; /*input high band pcm*/
if (xhigh == 32767) goto finish ;
ihigh = block1h (xhigh, shigh, dethigh) ; /*high band*/
dhigh = block2h (ihigh, dethigh) ; /*encoder */
dethigh = block3h (ihigh) ;
shigh = block4h (dhigh) ;
fprintf (outfile, "%o ", ihigh) ; /*output high band adpcm*/
newln: fprintf (outfile, "\n") ;
goto next;
finish: fprintf (outfile, "77777 77777 \n") ;
}
/************************** BLOCK 1L ********************************/
block1l (xl, sl, detl)
int xl, sl, detl ;
{
int il ;
int i, el, sil, mil, wd, wd1, hdu ;
static int q6[32] = {0, 35, 72, 110, 150, 190, 233, 276, 323,
370, 422, 473, 530, 587, 650, 714, 786,
858, 940, 1023, 1121, 1219, 1339, 1458,
1612, 1765, 1980, 2195, 2557, 2919, 0, 0} ;
static int iln[32] = {0, 63, 62, 31, 30, 29, 28, 27, 26, 25,
24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14,
13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 0 } ;
static int ilp[32] = {0, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52,
51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41,
40, 39, 38, 37, 36, 35, 34, 33, 32, 0 } ;
/*************************************** BLOCK 1L, SUBTRA ************/
el = xl - sl ;
if ( el > 32767 ) el = 32767;
if ( el < -32768 ) el = -32768;
/*************************************** BLOCK 1L, QUANTL ************/
sil = el >> 15 ;
if (sil == 0 ) wd = el ;
else wd = 32767 - el & 32767 ;
mil = 1 ;
for (i = 1; i < 30; i++) {
hdu = (q6[i] << 3) * detl;
wd1 = (hdu >> 15) ;
if (wd >= wd1) mil = (i + 1) ;
else break ;
}
if (sil == -1 ) il = iln[mil] ;
else il = ilp[mil] ;
return (il) ;
}
/*************************** BLOCK 2L *******************************/
block2l (il, detl)
int il, detl ;
{
int dlt ;
int ril, wd2 ;
static int qm4[16] =
{0, -20456, -12896, -8968,
-6288, -4240, -2584, -1200,
20456, 12896, 8968, 6288,
4240, 2584, 1200, 0 } ;
/************************************** BLOCK 2L, INVQAL ************/
ril = il >> 2 ;
wd2 = qm4[ril] ;
dlt = (detl * wd2) >> 15 ;
return (dlt) ;
}
/***************************** BLOCK 3L *******************************/
block3l (il)
int il ;
{
int detl ;
int ril, il4, wd, wd1, wd2, wd3, nbpl, depl ;
static int nbl = 0 ;
static int wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 } ;
static int rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2,
1, 0 } ;
static int ilb[32] = {2048, 2093, 2139, 2186, 2233, 2282, 2332,
2383, 2435, 2489, 2543, 2599, 2656, 2714,
2774, 2834, 2896, 2960, 3025, 3091, 3158,
3228, 3298, 3371, 3444, 3520, 3597, 3676,
3756, 3838, 3922, 4008 } ;
/************************************** BLOCK 3L, LOGSCL *************/
ril = il >> 2 ;
il4 = rl42[ril] ;
wd = (nbl * 32512) >> 15 ;
nbpl = wd + wl[il4] ;
if (nbpl < 0) nbpl = 0 ;
if (nbpl > 18432) nbpl = 18432 ;
/************************************** BLOCK 3L, SCALEL *************/
wd1 = (nbpl >> 6) & 31 ;
wd2 = nbpl >> 11 ;
if ((8 - wd2) < 0) wd3 = ilb[wd1] << (wd2 - 8) ;
else wd3 = ilb[wd1] >> (8 - wd2) ;
depl = wd3 << 2 ;
/************************************** BLOCK 3L, DELAYA *************/
nbl = nbpl ;
/************************************** BLOCK 3L, DELAYL *************/
detl = depl ;
if (prlev > 1) {
printf ("BLOCK3L il=%4d, ril=%4d, il4=%4d, nbl=%4d, wd=%4d, nbpl=%4d\n",
il, ril, il4, nbl, wd, nbpl) ;
printf ("wd1=%4d, wd2=%4d, wd3=%4d, depl=%4d, detl=%4d\n",
wd1, wd2, wd3, depl, detl) ;
}
return (detl) ;
}
/**************************** BLOCK 4L *******************************/
block4l (dl)
int dl ;
{
static int sl = 0 ;
int i ;
int wd, wd1, wd2, wd3, wd4, wd5, wd6 ;
static int spl = 0 ;
static int szl = 0 ;
static int rlt [3] = { 0, 0, 0 } ;
static int al [3] = { 0, 0, 0 } ;
static int apl [3] = { 0, 0, 0 } ;
static int plt [3] = { 0, 0, 0 } ;
static int dlt [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
static int bl [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
static int bpl [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
static int sg [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
dlt[0] = dl;
/*************************************** BLOCK 4L, RECONS ***********/
rlt[0] = sl + dlt[0] ;
if ( rlt[0] > 32767 ) rlt[0] = 32767;
if ( rlt[0] < -32768 ) rlt[0] = -32768;
/*************************************** BLOCK 4L, PARREC ***********/
plt[0] = dlt[0] + szl ;
if ( plt[0] > 32767 ) plt[0] = 32767;
if ( plt[0] < -32768 ) plt[0] = -32768;
/*****************************BLOCK 4L, UPPOL2*************************/
sg[0] = plt[0] >> 15 ;
sg[1] = plt[1] >> 15 ;
sg[2] = plt[2] >> 15 ;
wd1 = al[1] + al[1] ;
wd1 = wd1 + wd1 ;
if ( wd1 > 32767 ) wd1 = 32767;
if ( wd1 < -32768 ) wd1 = -32768;
if ( sg[0] == sg[1] ) wd2 = - wd1 ;
else wd2 = wd1 ;
if ( wd2 > 32767 ) wd2 = 32767;
wd2 = wd2 >> 7 ;
if ( sg[0] == sg[2] ) wd3 = 128 ;
else wd3 = - 128 ;
wd4 = wd2 + wd3 ;
wd5 = (al[2] * 32512) >> 15 ;
apl[2] = wd4 + wd5 ;
if ( apl[2] > 12288 ) apl[2] = 12288 ;
if ( apl[2] < -12288 ) apl[2] = -12288 ;
/************************************* BLOCK 4L, UPPOL1 ***************/
sg[0] = plt[0] >> 15 ;
sg[1] = plt[1] >> 15 ;
if ( sg[0] == sg[1] ) wd1 = 192 ;
if ( sg[0] != sg[1] ) wd1 = - 192 ;
wd2 = (al[1] * 32640) >> 15 ;
apl[1] = wd1 + wd2 ;
if ( apl[1] > 32767 ) apl[1] = 32767;
if ( apl[1] < -32768 ) apl[1] = -32768;
wd3 = (15360 - apl[2]) ;
if ( wd3 > 32767 ) wd3 = 32767;
if ( wd3 < -32768 ) wd3 = -32768;
if ( apl[1] > wd3) apl[1] = wd3 ;
if ( apl[1] < -wd3) apl[1] = -wd3 ;
/*************************************** BLOCK 4L, UPZERO ************/
if ( dlt[0] == 0 ) wd1 = 0 ;
if ( dlt[0] != 0 ) wd1 = 128 ;
sg[0] = dlt[0] >> 15 ;
for ( i = 1; i < 7; i++ ) {
sg[i] = dlt[i] >> 15 ;
if ( sg[i] == sg[0] ) wd2 = wd1 ;
if ( sg[i] != sg[0] ) wd2 = - wd1 ;
wd3 = (bl[i] * 32640) >> 15 ;
bpl[i] = wd2 + wd3 ;
if ( bpl[i] > 32767 ) bpl[i] = 32767;
if ( bpl[i] < -32768 ) bpl[i] = -32768;
}
/********************************* BLOCK 4L, DELAYA ******************/
for ( i = 6; i > 0; i-- ) {
dlt[i] = dlt[i-1] ;
bl[i] = bpl[i] ;
}
for ( i = 2; i > 0; i-- ) {
rlt[i] = rlt[i-1] ;
plt[i] = plt[i-1] ;
al[i] = apl[i] ;
}
/********************************* BLOCK 4L, FILTEP ******************/
wd1 = ( rlt[1] + rlt[1] ) ;
if ( wd1 > 32767 ) wd1 = 32767;
if ( wd1 < -32768 ) wd1 = -32768;
wd1 = ( al[1] * wd1 ) >> 15 ;
wd2 = ( rlt[2] + rlt[2] ) ;
if ( wd2 > 32767 ) wd2 = 32767;
if ( wd2 < -32768 ) wd2 = -32768;
wd2 = ( al[2] * wd2 ) >> 15 ;
spl = wd1 + wd2 ;
if ( spl > 32767 ) spl = 32767;
if ( spl < -32768 ) spl = -32768;
/*************************************** BLOCK 4L, FILTEZ ***********/
szl = 0 ;
for (i=6; i>0; i--) {
wd = (dlt[i] + dlt[i]) ;
if ( wd > 32767 ) wd = 32767;
if ( wd < -32768 ) wd = -32768;
szl += (bl[i] * wd) >> 15 ;
if ( szl > 32767 ) szl = 32767;
if ( szl < -32768 ) szl = -32768;
}
/*********************************BLOCK 4L, PREDIC *******************/
sl = spl + szl ;
if ( sl > 32767 ) sl = 32767;
if ( sl < -32768 ) sl = -32768;
return (sl) ;
}
/************************** BLOCK 1H ********************************/
block1h (xh, sh, deth)
int xh, sh, deth ;
{
int ih ;
int eh, sih, mih, wd, wd1, hdu ;
static int ihn[3] = { 0, 1, 0 } ;
static int ihp[3] = { 0, 3, 2 } ;
/*************************************** BLOCK 1H, SUBTRA ************/
eh = xh - sh ;
if ( eh > 32767 ) eh = 32767;
if ( eh < -32768 ) eh = -32768;
/*************************************** BLOCK 1H, QUANTH ************/
sih = eh >> 15 ;
if (sih == 0 ) wd = eh ;
else wd = 32767 - eh & 32767 ;
hdu = (564 << 3) * deth;
wd1 = (hdu >> 15) ;
if (wd >= wd1) mih = 2 ;
else mih = 1 ;
if (sih == -1 ) ih = ihn[mih] ;
else ih = ihp[mih] ;
return (ih) ;
}
/*************************** BLOCK 2H *******************************/
block2h (ih, deth)
int ih, deth ;
{
int dh ;
int wd2 ;
static int qm2[4] =
{-7408, -1616, 7408, 1616} ;
/************************************** BLOCK 2H, INVQAH ************/
wd2 = qm2[ih] ;
dh = (deth * wd2) >> 15 ;
return (dh) ;
}
/***************************** BLOCK 3H *******************************/
block3h (ih)
int ih ;
{
int deth ;
int ih2, wd, wd1, wd2, wd3, nbph, deph ;
static int nbh = 0 ;
static int wh[3] = {0, -214, 798} ;
static int rh2[4] = {2, 1, 2, 1} ;
static int ilb[32] = {2048, 2093, 2139, 2186, 2233, 2282, 2332,
2383, 2435, 2489, 2543, 2599, 2656, 2714,
2774, 2834, 2896, 2960, 3025, 3091, 3158,
3228, 3298, 3371, 3444, 3520, 3597, 3676,
3756, 3838, 3922, 4008 } ;
/************************************** BLOCK 3H, LOGSCH *************/
ih2 = rh2[ih] ;
wd = (nbh * 32512) >> 15 ;
nbph = wd + wh[ih2] ;
if (nbph < 0) nbph = 0 ;
if (nbph > 22528) nbph = 22528 ;
/************************************** BLOCK 3H, SCALEH *************/
wd1 = (nbph >> 6) & 31 ;
wd2 = nbph >> 11 ;
if ((10-wd2) < 0) wd3 = ilb[wd1] << (wd2-10) ;
else wd3 = ilb[wd1] >> (10-wd2) ;
deph = wd3 << 2 ;
/************************************** BLOCK 3L, DELAYA *************/
nbh = nbph ;
/************************************** BLOCK 3L, DELAYH *************/
deth = deph ;
return (deth) ;
}
/**************************** BLOCK 4H *******************************/
block4h (d)
int d ;
{
static int sh = 0 ;
int i ;
int wd, wd1, wd2, wd3, wd4, wd5, wd6 ;
static int sph = 0 ;
static int szh = 0 ;
static int rh [3] = { 0, 0, 0 } ;
static int ah [3] = { 0, 0, 0 } ;
static int aph [3] = { 0, 0, 0 } ;
static int ph [3] = { 0, 0, 0 } ;
static int dh [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
static int bh [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
static int bph [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
static int sg [7] = { 0, 0, 0, 0, 0, 0, 0 } ;
dh[0] = d;
/*************************************** BLOCK 4H, RECONS ***********/
rh[0] = sh + dh[0] ;
if ( rh[0] > 32767 ) rh[0] = 32767;
if ( rh[0] < -32768 ) rh[0] = -32768;
/*************************************** BLOCK 4H, PARREC ***********/
ph[0] = dh[0] + szh ;
if ( ph[0] > 32767 ) ph[0] = 32767;
if ( ph[0] < -32768 ) ph[0] = -32768;
/*****************************BLOCK 4H, UPPOL2*************************/
sg[0] = ph[0] >> 15 ;
sg[1] = ph[1] >> 15 ;
sg[2] = ph[2] >> 15 ;
wd1 = ah[1] + ah[1] ;
wd1 = wd1 + wd1 ;
if ( wd1 > 32767 ) wd1 = 32767;
if ( wd1 < -32768 ) wd1 = -32768;
if ( sg[0] == sg[1] ) wd2 = - wd1 ;
else wd2 = wd1 ;
if ( wd2 > 32767 ) wd2 = 32767;
wd2 = wd2 >> 7 ;
if ( sg[0] == sg[2] ) wd3 = 128 ;
else wd3 = - 128 ;
wd4 = wd2 + wd3 ;
wd5 = (ah[2] * 32512) >> 15 ;
aph[2] = wd4 + wd5 ;
if ( aph[2] > 12288 ) aph[2] = 12288 ;
if ( aph[2] < -12288 ) aph[2] = -12288 ;
/************************************* BLOCK 4H, UPPOL1 ***************/
sg[0] = ph[0] >> 15 ;
sg[1] = ph[1] >> 15 ;
if ( sg[0] == sg[1] ) wd1 = 192 ;
if ( sg[0] != sg[1] ) wd1 = - 192 ;
wd2 = (ah[1] * 32640) >> 15 ;
aph[1] = wd1 + wd2 ;
if ( aph[1] > 32767 ) aph[1] = 32767;
if ( aph[1] < -32768 ) aph[1] = -32768;
wd3 = (15360 - aph[2]) ;
if ( wd3 > 32767 ) wd3 = 32767;
if ( wd3 < -32768 ) wd3 = -32768;
if ( aph[1] > wd3) aph[1] = wd3 ;
if ( aph[1] < -wd3) aph[1] = -wd3 ;
/*************************************** BLOCK 4H, UPZERO ************/
if ( dh[0] == 0 ) wd1 = 0 ;
if ( dh[0] != 0 ) wd1 = 128 ;
sg[0] = dh[0] >> 15 ;
for ( i = 1; i < 7; i++ ) {
sg[i] = dh[i] >> 15 ;
if ( sg[i] == sg[0] ) wd2 = wd1 ;
if ( sg[i] != sg[0] ) wd2 = - wd1 ;
wd3 = (bh[i] * 32640) >> 15 ;
bph[i] = wd2 + wd3 ;
if ( bph[i] > 32767 ) bph[i]= 32767;
if ( bph[i] < -32768 ) bph[i] = -32768;
}
/********************************* BLOCK 4H, DELAYA ******************/
for ( i = 6; i > 0; i-- ) {
dh[i] = dh[i-1] ;
bh[i] = bph[i] ;
}
for ( i = 2; i > 0; i-- ) {
rh[i] = rh[i-1] ;
ph[i] = ph[i-1] ;
ah[i] = aph[i] ;
}
/********************************* BLOCK 4H, FILTEP ******************/
wd1 = ( rh[1] + rh[1] ) ;
if ( wd1 > 32767 ) wd1 = 32767;
if ( wd1 < -32768 ) wd1 = -32768;
wd1 = ( ah[1] * wd1 ) >> 15 ;
wd2 = ( rh[2] + rh[2] ) ;
if ( wd2 > 32767 ) wd2 = 32767;
if ( wd2 < -32768 ) wd2 = -32768;
wd2 = ( ah[2] * wd2 ) >> 15 ;
sph = wd1 + wd2 ;
if ( sph > 32767 ) sph = 32767;
if ( sph < -32768 ) sph = -32768;
/*************************************** BLOCK 4H, FILTEZ ***********/
szh = 0 ;
for (i=6; i>0; i--) {
wd = (dh[i] + dh[i]) ;
if ( wd > 32767 ) wd = 32767;
if ( wd < -32768 ) wd = -32768;
szh += (bh[i] * wd) >> 15 ;
if ( szh > 32767 ) szh = 32767;
if ( szh < -32768 ) szh = -32768;
}
/*********************************BLOCK 4L, PREDIC *******************/
sh = sph + szh ;
if ( sh > 32767 ) sh = 32767;
if ( sh < -32768 ) sh = -32768;
return (sh) ;
}