/*
* Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
* Universitaet Berlin. See the accompanying file "COPYRIGHT" for
* details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
*/
/* This file was created by concatenating a number of separate header
and source files from Jutta Degener and Carsten Bormann implementation,
patch level 10. This was done to simplify Squeak source code maintenance.
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
/****** begin "gsm.h" *****/
#ifdef __cplusplus
# define NeedFunctionPrototypes 1
#endif
#if __STDC__
# define NeedFunctionPrototypes 1
#endif
#ifdef _NO_PROTO
# undef NeedFunctionPrototypes
#endif
#ifdef NeedFunctionPrototypes
# include <stdio.h> /* for FILE * */
#endif
#undef GSM_P
#if NeedFunctionPrototypes
# define GSM_P( protos ) protos
#else
# define GSM_P( protos ) ( /* protos */ )
#endif
/*
* Interface
*/
typedef struct gsm_state * gsm;
typedef short gsm_signal; /* signed 16 bit */
typedef unsigned char gsm_byte;
typedef gsm_byte gsm_frame[33]; /* 33 * 8 bits */
#define GSM_MAGIC 0xD /* 13 kbit/s RPE-LTP */
#define GSM_PATCHLEVEL 10
#define GSM_MINOR 0
#define GSM_MAJOR 1
#define GSM_OPT_VERBOSE 1
#define GSM_OPT_FAST 2
#define GSM_OPT_LTP_CUT 3
#define GSM_OPT_WAV49 4
#define GSM_OPT_FRAME_INDEX 5
#define GSM_OPT_FRAME_CHAIN 6
extern gsm gsm_create GSM_P((void));
extern void gsm_destroy GSM_P((gsm));
extern int gsm_print GSM_P((FILE *, gsm, gsm_byte *));
extern int gsm_option GSM_P((gsm, int, int *));
extern void gsm_encode GSM_P((gsm, gsm_signal *, gsm_byte *));
extern int gsm_decode GSM_P((gsm, gsm_byte *, gsm_signal *));
extern int gsm_explode GSM_P((gsm, gsm_byte *, gsm_signal *));
extern void gsm_implode GSM_P((gsm, gsm_signal *, gsm_byte *));
/****** begin "proto.h" *****/
#if __cplusplus
# define NeedFunctionPrototypes 1
#endif
#if __STDC__
# define NeedFunctionPrototypes 1
#endif
#ifdef _NO_PROTO
# undef NeedFunctionPrototypes
#endif
#undef P /* gnu stdio.h actually defines this... */
#undef P0
#undef P1
#undef P2
#undef P3
#undef P4
#undef P5
#undef P6
#undef P7
#undef P8
#if NeedFunctionPrototypes
# define P( protos ) protos
# define P0() (void)
# define P1(x, a) (a)
# define P2(x, a, b) (a, b)
# define P3(x, a, b, c) (a, b, c)
# define P4(x, a, b, c, d) (a, b, c, d)
# define P5(x, a, b, c, d, e) (a, b, c, d, e)
# define P6(x, a, b, c, d, e, f) (a, b, c, d, e, f)
# define P7(x, a, b, c, d, e, f, g) (a, b, c, d, e, f, g)
# define P8(x, a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g, h)
#else /* !NeedFunctionPrototypes */
# define P( protos ) ( /* protos */ )
# define P0() ()
# define P1(x, a) x a;
# define P2(x, a, b) x a; b;
# define P3(x, a, b, c) x a; b; c;
# define P4(x, a, b, c, d) x a; b; c; d;
# define P5(x, a, b, c, d, e) x a; b; c; d; e;
# define P6(x, a, b, c, d, e, f) x a; b; c; d; e; f;
# define P7(x, a, b, c, d, e, f, g) x a; b; c; d; e; f; g;
# define P8(x, a, b, c, d, e, f, g, h) x a; b; c; d; e; f; g; h;
#endif /* !NeedFunctionPrototypes */
/****** begin "private.h" *****/
typedef short word; /* 16 bit signed int */
typedef long longword; /* 32 bit signed int */
typedef unsigned short uword; /* unsigned word */
typedef unsigned long ulongword; /* unsigned longword */
struct gsm_state {
word dp0[ 280 ];
word z1; /* preprocessing.c, Offset_com. */
longword L_z2; /* Offset_com. */
int mp; /* Preemphasis */
word u[8]; /* short_term_aly_filter.c */
word LARpp[2][8]; /* */
word j; /* */
word ltp_cut; /* long_term.c, LTP crosscorr. */
word nrp; /* 40 */ /* long_term.c, synthesis */
word v[9]; /* short_term.c, synthesis */
word msr; /* decoder.c, Postprocessing */
char verbose; /* only used if !NDEBUG */
char fast; /* only used if FAST */
char wav_fmt; /* only used if WAV49 defined */
unsigned char frame_index; /* odd/even chaining */
unsigned char frame_chain; /* half-byte to carry forward */
};
#define MIN_WORD (-32767 - 1)
#define MAX_WORD 32767
#define MIN_LONGWORD (-2147483647 - 1)
#define MAX_LONGWORD 2147483647
#ifdef SASR /* flag: >> is a signed arithmetic shift right */
#undef SASR
#define SASR(x, by) ((x) >> (by))
#else
#define SASR(x, by) ((x) >= 0 ? (x) >> (by) : (~(-((x) + 1) >> (by))))
#endif /* SASR */
//#include "proto.h"
/*
* Prototypes from add.c
*/
extern word gsm_mult P((word a, word b));
extern longword gsm_L_mult P((word a, word b));
extern word gsm_mult_r P((word a, word b));
extern word gsm_div P((word num, word denum));
extern word gsm_add P(( word a, word b ));
extern longword gsm_L_add P(( longword a, longword b ));
extern word gsm_sub P((word a, word b));
extern longword gsm_L_sub P((longword a, longword b));
extern word gsm_abs P((word a));
extern word gsm_norm P(( longword a ));
extern longword gsm_L_asl P((longword a, int n));
extern word gsm_asl P((word a, int n));
extern longword gsm_L_asr P((longword a, int n));
extern word gsm_asr P((word a, int n));
/*
* Inlined functions from add.h
*/
/*
* #define GSM_MULT_R(a, b) (* word a, word b, !(a == b == MIN_WORD) *) \
* (0x0FFFF & SASR(((longword)(a) * (longword)(b) + 16384), 15))
*/
#define GSM_MULT_R(a, b) /* word a, word b, !(a == b == MIN_WORD) */ \
(SASR( ((longword)(a) * (longword)(b) + 16384), 15 ))
# define GSM_MULT(a,b) /* word a, word b, !(a == b == MIN_WORD) */ \
(SASR( ((longword)(a) * (longword)(b)), 15 ))
# define GSM_L_MULT(a, b) /* word a, word b */ \
(((longword)(a) * (longword)(b)) << 1)
# define GSM_L_ADD(a, b) \
( (a) < 0 ? ( (b) >= 0 ? (a) + (b) \
: (utmp = (ulongword)-((a) + 1) + (ulongword)-((b) + 1)) \
>= MAX_LONGWORD ? MIN_LONGWORD : -(longword)utmp-2 ) \
: ((b) <= 0 ? (a) + (b) \
: (utmp = (ulongword)(a) + (ulongword)(b)) >= MAX_LONGWORD \
? MAX_LONGWORD : utmp))
/*
* # define GSM_ADD(a, b) \
* ((ltmp = (longword)(a) + (longword)(b)) >= MAX_WORD \
* ? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)
*/
/* Nonportable, but faster: */
#define GSM_ADD(a, b) \
((ulongword)((ltmp = (longword)(a) + (longword)(b)) - MIN_WORD) > \
MAX_WORD - MIN_WORD ? (ltmp > 0 ? MAX_WORD : MIN_WORD) : ltmp)
# define GSM_SUB(a, b) \
((ltmp = (longword)(a) - (longword)(b)) >= MAX_WORD \
? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)
# define GSM_ABS(a) ((a) < 0 ? ((a) == MIN_WORD ? MAX_WORD : -(a)) : (a))
/* Use these if necessary:
# define GSM_MULT_R(a, b) gsm_mult_r(a, b)
# define GSM_MULT(a, b) gsm_mult(a, b)
# define GSM_L_MULT(a, b) gsm_L_mult(a, b)
# define GSM_L_ADD(a, b) gsm_L_add(a, b)
# define GSM_ADD(a, b) gsm_add(a, b)
# define GSM_SUB(a, b) gsm_sub(a, b)
# define GSM_ABS(a) gsm_abs(a)
*/
/*
* More prototypes from implementations..
*/
extern void Gsm_Coder P((
struct gsm_state * S,
word * s, /* [0..159] samples IN */
word * LARc, /* [0..7] LAR coefficients OUT */
word * Nc, /* [0..3] LTP lag OUT */
word * bc, /* [0..3] coded LTP gain OUT */
word * Mc, /* [0..3] RPE grid selection OUT */
word * xmaxc,/* [0..3] Coded maximum amplitude OUT */
word * xMc /* [13*4] normalized RPE samples OUT */));
extern void Gsm_Long_Term_Predictor P(( /* 4x for 160 samples */
struct gsm_state * S,
word * d, /* [0..39] residual signal IN */
word * dp, /* [-120..-1] d' IN */
word * e, /* [0..40] OUT */
word * dpp, /* [0..40] OUT */
word * Nc, /* correlation lag OUT */
word * bc /* gain factor OUT */));
extern void Gsm_LPC_Analysis P((
struct gsm_state * S,
word * s, /* 0..159 signals IN/OUT */
word * LARc)); /* 0..7 LARc's OUT */
extern void Gsm_Preprocess P((
struct gsm_state * S,
word * s, word * so));
extern void Gsm_Encoding P((
struct gsm_state * S,
word * e,
word * ep,
word * xmaxc,
word * Mc,
word * xMc));
extern void Gsm_Short_Term_Analysis_Filter P((
struct gsm_state * S,
word * LARc, /* coded log area ratio [0..7] IN */
word * d /* st res. signal [0..159] IN/OUT */));
extern void Gsm_Decoder P((
struct gsm_state * S,
word * LARcr, /* [0..7] IN */
word * Ncr, /* [0..3] IN */
word * bcr, /* [0..3] IN */
word * Mcr, /* [0..3] IN */
word * xmaxcr, /* [0..3] IN */
word * xMcr, /* [0..13*4] IN */
word * s)); /* [0..159] OUT */
extern void Gsm_Decoding P((
struct gsm_state * S,
word xmaxcr,
word Mcr,
word * xMcr, /* [0..12] IN */
word * erp)); /* [0..39] OUT */
extern void Gsm_Long_Term_Synthesis_Filtering P((
struct gsm_state* S,
word Ncr,
word bcr,
word * erp, /* [0..39] IN */
word * drp)); /* [-120..-1] IN, [0..40] OUT */
void Gsm_RPE_Decoding P((
struct gsm_state *S,
word xmaxcr,
word Mcr,
word * xMcr, /* [0..12], 3 bits IN */
word * erp)); /* [0..39] OUT */
void Gsm_RPE_Encoding P((
struct gsm_state * S,
word * e, /* -5..-1][0..39][40..44 IN/OUT */
word * xmaxc, /* OUT */
word * Mc, /* OUT */
word * xMc)); /* [0..12] OUT */
extern void Gsm_Short_Term_Synthesis_Filter P((
struct gsm_state * S,
word * LARcr, /* log area ratios [0..7] IN */
word * drp, /* received d [0...39] IN */
word * s)); /* signal s [0..159] OUT */
extern void Gsm_Update_of_reconstructed_short_time_residual_signal P((
word * dpp, /* [0...39] IN */
word * ep, /* [0...39] IN */
word * dp)); /* [-120...-1] IN/OUT */
/*
* Tables from table.c
*/
#ifndef GSM_TABLE_C
extern word gsm_A[8], gsm_B[8], gsm_MIC[8], gsm_MAC[8];
extern word gsm_INVA[8];
extern word gsm_DLB[4], gsm_QLB[4];
extern word gsm_H[11];
extern word gsm_NRFAC[8];
extern word gsm_FAC[8];
#endif /* GSM_TABLE_C */
/*
* Debugging
*/
#ifdef NDEBUG
# define gsm_debug_words(a, b, c, d) /* nil */
# define gsm_debug_longwords(a, b, c, d) /* nil */
# define gsm_debug_word(a, b) /* nil */
# define gsm_debug_longword(a, b) /* nil */
#else /* !NDEBUG => DEBUG */
extern void gsm_debug_words P((char * name, int, int, word *));
extern void gsm_debug_longwords P((char * name, int, int, longword *));
extern void gsm_debug_longword P((char * name, longword));
extern void gsm_debug_word P((char * name, word));
#endif /* !NDEBUG */
/****** begin "add.c" *****/
#define saturate(x) \
((x) < MIN_WORD ? MIN_WORD : (x) > MAX_WORD ? MAX_WORD: (x))
word gsm_add P2((a,b), word a, word b)
{
longword sum = (longword)a + (longword)b;
return saturate(sum);
}
word gsm_sub P2((a,b), word a, word b)
{
longword diff = (longword)a - (longword)b;
return saturate(diff);
}
word gsm_mult P2((a,b), word a, word b)
{
if (a == MIN_WORD && b == MIN_WORD) return MAX_WORD;
else return SASR( (longword)a * (longword)b, 15 );
}
word gsm_mult_r P2((a,b), word a, word b)
{
if (b == MIN_WORD && a == MIN_WORD) return MAX_WORD;
else {
longword prod = (longword)a * (longword)b + 16384;
prod >>= 15;
return prod & 0xFFFF;
}
}
word gsm_abs P1((a), word a)
{
return a < 0 ? (a == MIN_WORD ? MAX_WORD : -a) : a;
}
longword gsm_L_mult P2((a,b),word a, word b)
{
assert( a != MIN_WORD || b != MIN_WORD );
return ((longword)a * (longword)b) << 1;
}
longword gsm_L_add P2((a,b), longword a, longword b)
{
if (a < 0) {
if (b >= 0) return a + b;
else {
ulongword A = (ulongword)-(a + 1) + (ulongword)-(b + 1);
return A >= MAX_LONGWORD ? MIN_LONGWORD :-(longword)A-2;
}
}
else if (b <= 0) return a + b;
else {
ulongword A = (ulongword)a + (ulongword)b;
return A > MAX_LONGWORD ? MAX_LONGWORD : A;
}
}
longword gsm_L_sub P2((a,b), longword a, longword b)
{
if (a >= 0) {
if (b >= 0) return a - b;
else {
/* a>=0, b<0 */
ulongword A = (ulongword)a + -(b + 1);
return A >= MAX_LONGWORD ? MAX_LONGWORD : (A + 1);
}
}
else if (b <= 0) return a - b;
else {
/* a<0, b>0 */
ulongword A = (ulongword)-(a + 1) + b;
return A >= MAX_LONGWORD ? MIN_LONGWORD : -(longword)A - 1;
}
}
static unsigned char const bitoff[ 256 ] = {
8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
word gsm_norm P1((a), longword a )
/*
* the number of left shifts needed to normalize the 32 bit
* variable L_var1 for positive values on the interval
*
* with minimum of
* minimum of 1073741824 (01000000000000000000000000000000) and
* maximum of 2147483647 (01111111111111111111111111111111)
*
*
* and for negative values on the interval with
* minimum of -2147483648 (-10000000000000000000000000000000) and
* maximum of -1073741824 ( -1000000000000000000000000000000).
*
* in order to normalize the result, the following
* operation must be done: L_norm_var1 = L_var1 << norm( L_var1 );
*
* (That's 'ffs', only from the left, not the right..)
*/
{
assert(a != 0);
if (a < 0) {
if (a <= -1073741824) return 0;
a = ~a;
}
return a & 0xffff0000
? ( a & 0xff000000
? -1 + bitoff[ 0xFF & (a >> 24) ]
: 7 + bitoff[ 0xFF & (a >> 16) ] )
: ( a & 0xff00
? 15 + bitoff[ 0xFF & (a >> 8) ]
: 23 + bitoff[ 0xFF & a ] );
}
longword gsm_L_asl P2((a,n), longword a, int n)
{
if (n >= 32) return 0;
if (n <= -32) return -(a < 0);
if (n < 0) return gsm_L_asr(a, -n);
return a << n;
}
word gsm_asl P2((a,n), word a, int n)
{
if (n >= 16) return 0;
if (n <= -16) return -(a < 0);
if (n < 0) return gsm_asr(a, -n);
return a << n;
}
longword gsm_L_asr P2((a,n), longword a, int n)
{
if (n >= 32) return -(a < 0);
if (n <= -32) return 0;
if (n < 0) return a << -n;
# ifdef SASR
return a >> n;
# else
if (a >= 0) return a >> n;
else return -(longword)( -(ulongword)a >> n );
# endif
}
word gsm_asr P2((a,n), word a, int n)
{
if (n >= 16) return -(a < 0);
if (n <= -16) return 0;
if (n < 0) return a << -n;
# ifdef SASR
return a >> n;
# else
if (a >= 0) return a >> n;
else return -(word)( -(uword)a >> n );
# endif
}
/*
* (From p. 46, end of section 4.2.5)
*
* NOTE: The following lines gives [sic] one correct implementation
* of the div(num, denum) arithmetic operation. Compute div
* which is the integer division of num by denum: with denum
* >= num > 0
*/
word gsm_div P2((num,denum), word num, word denum)
{
longword L_num = num;
longword L_denum = denum;
word div = 0;
volatile int k = 15;
/* The parameter num sometimes becomes zero.
* Although this is explicitly guarded against in 4.2.5,
* we assume that the result should then be zero as well.
*/
/* assert(num != 0); */
assert(num >= 0 && denum >= num);
if (num == 0)
return 0;
while (k--) {
div <<= 1;
L_num <<= 1;
if (L_num >= L_denum) {
L_num -= L_denum;
div++;
}
}
return div;
}
/****** begin "code.c" *****/
/*
* 4.2 FIXED POINT IMPLEMENTATION OF THE RPE-LTP CODER
*/
void Gsm_Coder P8((S,s,LARc,Nc,bc,Mc,xmaxc,xMc),
struct gsm_state * S,
word * s, /* [0..159] samples IN */
/*
* The RPE-LTD coder works on a frame by frame basis. The length of
* the frame is equal to 160 samples. Some computations are done
* once per frame to produce at the output of the coder the
* LARc[1..8] parameters which are the coded LAR coefficients and
* also to realize the inverse filtering operation for the entire
* frame (160 samples of signal d[0..159]). These parts produce at
* the output of the coder:
*/
word * LARc, /* [0..7] LAR coefficients OUT */
/*
* Procedure 4.2.11 to 4.2.18 are to be executed four times per
* frame. That means once for each sub-segment RPE-LTP analysis of
* 40 samples. These parts produce at the output of the coder:
*/
word * Nc, /* [0..3] LTP lag OUT */
word * bc, /* [0..3] coded LTP gain OUT */
word * Mc, /* [0..3] RPE grid selection OUT */
word * xmaxc,/* [0..3] Coded maximum amplitude OUT */
word * xMc /* [13*4] normalized RPE samples OUT */
)
{
int k;
word * dp = S->dp0 + 120; /* [ -120...-1 ] */
word * dpp = dp; /* [ 0...39 ] */
static word e[50];
word so[160];
Gsm_Preprocess (S, s, so);
Gsm_LPC_Analysis (S, so, LARc);
Gsm_Short_Term_Analysis_Filter (S, LARc, so);
for (k = 0; k <= 3; k++, xMc += 13) {
Gsm_Long_Term_Predictor ( S,
so+k*40, /* d [0..39] IN */
dp, /* dp [-120..-1] IN */
e + 5, /* e [0..39] OUT */
dpp, /* dpp [0..39] OUT */
Nc++,
bc++);
Gsm_RPE_Encoding ( S,
e + 5, /* e ][0..39][ IN/OUT */
xmaxc++, Mc++, xMc );
/*
* Gsm_Update_of_reconstructed_short_time_residual_signal
* ( dpp, e + 5, dp );
*/
{ register int i;
register longword ltmp;
for (i = 0; i <= 39; i++)
dp[ i ] = GSM_ADD( e[5 + i], dpp[i] );
}
dp += 40;
dpp += 40;
}
(void)memcpy( (char *)S->dp0, (char *)(S->dp0 + 160),
120 * sizeof(*S->dp0) );
}
/****** begin "decode.c" *****/
/*
* 4.3 FIXED POINT IMPLEMENTATION OF THE RPE-LTP DECODER
*/
static void Postprocessing P2((S,s),
struct gsm_state * S,
register word * s)
{
register int k;
register word msr = S->msr;
register longword ltmp; /* for GSM_ADD */
register word tmp;
for (k = 160; k--; s++) {
tmp = GSM_MULT_R( msr, 28180 );
msr = GSM_ADD(*s, tmp); /* Deemphasis */
*s = GSM_ADD(msr, msr) & 0xFFF8; /* Truncation & Upscaling */
}
S->msr = msr;
}
void Gsm_Decoder P8((S,LARcr, Ncr,bcr,Mcr,xmaxcr,xMcr,s),
struct gsm_state * S,
word * LARcr, /* [0..7] IN */
word * Ncr, /* [0..3] IN */
word * bcr, /* [0..3] IN */
word * Mcr, /* [0..3] IN */
word * xmaxcr, /* [0..3] IN */
word * xMcr, /* [0..13*4] IN */
word * s) /* [0..159] OUT */
{
int j, k;
word erp[40], wt[160];
word * drp = S->dp0 + 120;
for (j=0; j <= 3; j++, xmaxcr++, bcr++, Ncr++, Mcr++, xMcr += 13) {
Gsm_RPE_Decoding( S, *xmaxcr, *Mcr, xMcr, erp );
Gsm_Long_Term_Synthesis_Filtering( S, *Ncr, *bcr, erp, drp );
for (k = 0; k <= 39; k++) wt[ j * 40 + k ] = drp[ k ];
}
Gsm_Short_Term_Synthesis_Filter( S, LARcr, wt, s );
Postprocessing(S, s);
}
/****** begin "gsm_decode.c" *****/
int gsm_decode P3((s, c, target), gsm s, gsm_byte * c, gsm_signal * target)
{
word LARc[8], Nc[4], Mc[4], bc[4], xmaxc[4], xmc[13*4];
#ifdef WAV49
if (s->wav_fmt) {
uword sr = 0;
s->frame_index = !s->frame_index;
if (s->frame_index) {
sr = *c++;
LARc[0] = sr & 0x3f; sr >>= 6;
sr |= (uword)*c++ << 2;
LARc[1] = sr & 0x3f; sr >>= 6;
sr |= (uword)*c++ << 4;
LARc[2] = sr & 0x1f; sr >>= 5;
LARc[3] = sr & 0x1f; sr >>= 5;
sr |= (uword)*c++ << 2;
LARc[4] = sr & 0xf; sr >>= 4;
LARc[5] = sr & 0xf; sr >>= 4;
sr |= (uword)*c++ << 2; /* 5 */
LARc[6] = sr & 0x7; sr >>= 3;
LARc[7] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 4;
Nc[0] = sr & 0x7f; sr >>= 7;
bc[0] = sr & 0x3; sr >>= 2;
Mc[0] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 1;
xmaxc[0] = sr & 0x3f; sr >>= 6;
xmc[0] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[1] = sr & 0x7; sr >>= 3;
xmc[2] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[3] = sr & 0x7; sr >>= 3;
xmc[4] = sr & 0x7; sr >>= 3;
xmc[5] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1; /* 10 */
xmc[6] = sr & 0x7; sr >>= 3;
xmc[7] = sr & 0x7; sr >>= 3;
xmc[8] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[9] = sr & 0x7; sr >>= 3;
xmc[10] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[11] = sr & 0x7; sr >>= 3;
xmc[12] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 4;
Nc[1] = sr & 0x7f; sr >>= 7;
bc[1] = sr & 0x3; sr >>= 2;
Mc[1] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 1;
xmaxc[1] = sr & 0x3f; sr >>= 6;
xmc[13] = sr & 0x7; sr >>= 3;
sr = *c++; /* 15 */
xmc[14] = sr & 0x7; sr >>= 3;
xmc[15] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[16] = sr & 0x7; sr >>= 3;
xmc[17] = sr & 0x7; sr >>= 3;
xmc[18] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[19] = sr & 0x7; sr >>= 3;
xmc[20] = sr & 0x7; sr >>= 3;
xmc[21] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[22] = sr & 0x7; sr >>= 3;
xmc[23] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[24] = sr & 0x7; sr >>= 3;
xmc[25] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 4; /* 20 */
Nc[2] = sr & 0x7f; sr >>= 7;
bc[2] = sr & 0x3; sr >>= 2;
Mc[2] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 1;
xmaxc[2] = sr & 0x3f; sr >>= 6;
xmc[26] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[27] = sr & 0x7; sr >>= 3;
xmc[28] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[29] = sr & 0x7; sr >>= 3;
xmc[30] = sr & 0x7; sr >>= 3;
xmc[31] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[32] = sr & 0x7; sr >>= 3;
xmc[33] = sr & 0x7; sr >>= 3;
xmc[34] = sr & 0x7; sr >>= 3;
sr = *c++; /* 25 */
xmc[35] = sr & 0x7; sr >>= 3;
xmc[36] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[37] = sr & 0x7; sr >>= 3;
xmc[38] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 4;
Nc[3] = sr & 0x7f; sr >>= 7;
bc[3] = sr & 0x3; sr >>= 2;
Mc[3] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 1;
xmaxc[3] = sr & 0x3f; sr >>= 6;
xmc[39] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[40] = sr & 0x7; sr >>= 3;
xmc[41] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2; /* 30 */
xmc[42] = sr & 0x7; sr >>= 3;
xmc[43] = sr & 0x7; sr >>= 3;
xmc[44] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[45] = sr & 0x7; sr >>= 3;
xmc[46] = sr & 0x7; sr >>= 3;
xmc[47] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[48] = sr & 0x7; sr >>= 3;
xmc[49] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[50] = sr & 0x7; sr >>= 3;
xmc[51] = sr & 0x7; sr >>= 3;
s->frame_chain = sr & 0xf;
}
else {
sr = s->frame_chain;
sr |= (uword)*c++ << 4; /* 1 */
LARc[0] = sr & 0x3f; sr >>= 6;
LARc[1] = sr & 0x3f; sr >>= 6;
sr = *c++;
LARc[2] = sr & 0x1f; sr >>= 5;
sr |= (uword)*c++ << 3;
LARc[3] = sr & 0x1f; sr >>= 5;
LARc[4] = sr & 0xf; sr >>= 4;
sr |= (uword)*c++ << 2;
LARc[5] = sr & 0xf; sr >>= 4;
LARc[6] = sr & 0x7; sr >>= 3;
LARc[7] = sr & 0x7; sr >>= 3;
sr = *c++; /* 5 */
Nc[0] = sr & 0x7f; sr >>= 7;
sr |= (uword)*c++ << 1;
bc[0] = sr & 0x3; sr >>= 2;
Mc[0] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 5;
xmaxc[0] = sr & 0x3f; sr >>= 6;
xmc[0] = sr & 0x7; sr >>= 3;
xmc[1] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[2] = sr & 0x7; sr >>= 3;
xmc[3] = sr & 0x7; sr >>= 3;
xmc[4] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[5] = sr & 0x7; sr >>= 3;
xmc[6] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2; /* 10 */
xmc[7] = sr & 0x7; sr >>= 3;
xmc[8] = sr & 0x7; sr >>= 3;
xmc[9] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[10] = sr & 0x7; sr >>= 3;
xmc[11] = sr & 0x7; sr >>= 3;
xmc[12] = sr & 0x7; sr >>= 3;
sr = *c++;
Nc[1] = sr & 0x7f; sr >>= 7;
sr |= (uword)*c++ << 1;
bc[1] = sr & 0x3; sr >>= 2;
Mc[1] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 5;
xmaxc[1] = sr & 0x3f; sr >>= 6;
xmc[13] = sr & 0x7; sr >>= 3;
xmc[14] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1; /* 15 */
xmc[15] = sr & 0x7; sr >>= 3;
xmc[16] = sr & 0x7; sr >>= 3;
xmc[17] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[18] = sr & 0x7; sr >>= 3;
xmc[19] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[20] = sr & 0x7; sr >>= 3;
xmc[21] = sr & 0x7; sr >>= 3;
xmc[22] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[23] = sr & 0x7; sr >>= 3;
xmc[24] = sr & 0x7; sr >>= 3;
xmc[25] = sr & 0x7; sr >>= 3;
sr = *c++;
Nc[2] = sr & 0x7f; sr >>= 7;
sr |= (uword)*c++ << 1; /* 20 */
bc[2] = sr & 0x3; sr >>= 2;
Mc[2] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 5;
xmaxc[2] = sr & 0x3f; sr >>= 6;
xmc[26] = sr & 0x7; sr >>= 3;
xmc[27] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[28] = sr & 0x7; sr >>= 3;
xmc[29] = sr & 0x7; sr >>= 3;
xmc[30] = sr & 0x7; sr >>= 3;
sr = *c++;
xmc[31] = sr & 0x7; sr >>= 3;
xmc[32] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[33] = sr & 0x7; sr >>= 3;
xmc[34] = sr & 0x7; sr >>= 3;
xmc[35] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1; /* 25 */
xmc[36] = sr & 0x7; sr >>= 3;
xmc[37] = sr & 0x7; sr >>= 3;
xmc[38] = sr & 0x7; sr >>= 3;
sr = *c++;
Nc[3] = sr & 0x7f; sr >>= 7;
sr |= (uword)*c++ << 1;
bc[3] = sr & 0x3; sr >>= 2;
Mc[3] = sr & 0x3; sr >>= 2;
sr |= (uword)*c++ << 5;
xmaxc[3] = sr & 0x3f; sr >>= 6;
xmc[39] = sr & 0x7; sr >>= 3;
xmc[40] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[41] = sr & 0x7; sr >>= 3;
xmc[42] = sr & 0x7; sr >>= 3;
xmc[43] = sr & 0x7; sr >>= 3;
sr = *c++; /* 30 */
xmc[44] = sr & 0x7; sr >>= 3;
xmc[45] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 2;
xmc[46] = sr & 0x7; sr >>= 3;
xmc[47] = sr & 0x7; sr >>= 3;
xmc[48] = sr & 0x7; sr >>= 3;
sr |= (uword)*c++ << 1;
xmc[49] = sr & 0x7; sr >>= 3;
xmc[50] = sr & 0x7; sr >>= 3;
xmc[51] = sr & 0x7; sr >>= 3;
}
}
else
#endif
{
/* GSM_MAGIC = (*c >> 4) & 0xF; */
if (((*c >> 4) & 0x0F) != GSM_MAGIC) return -1;
LARc[0] = (*c++ & 0xF) << 2; /* 1 */
LARc[0] |= (*c >> 6) & 0x3;
LARc[1] = *c++ & 0x3F;
LARc[2] = (*c >> 3) & 0x1F;
LARc[3] = (*c++ & 0x7) << 2;
LARc[3] |= (*c >> 6) & 0x3;
LARc[4] = (*c >> 2) & 0xF;
LARc[5] = (*c++ & 0x3) << 2;
LARc[5] |= (*c >> 6) & 0x3;
LARc[6] = (*c >> 3) & 0x7;
LARc[7] = *c++ & 0x7;
Nc[0] = (*c >> 1) & 0x7F;
bc[0] = (*c++ & 0x1) << 1;
bc[0] |= (*c >> 7) & 0x1;
Mc[0] = (*c >> 5) & 0x3;
xmaxc[0] = (*c++ & 0x1F) << 1;
xmaxc[0] |= (*c >> 7) & 0x1;
xmc[0] = (*c >> 4) & 0x7;
xmc[1] = (*c >> 1) & 0x7;
xmc[2] = (*c++ & 0x1) << 2;
xmc[2] |= (*c >> 6) & 0x3;
xmc[3] = (*c >> 3) & 0x7;
xmc[4] = *c++ & 0x7;
xmc[5] = (*c >> 5) & 0x7;
xmc[6] = (*c >> 2) & 0x7;
xmc[7] = (*c++ & 0x3) << 1; /* 10 */
xmc[7] |= (*c >> 7) & 0x1;
xmc[8] = (*c >> 4) & 0x7;
xmc[9] = (*c >> 1) & 0x7;
xmc[10] = (*c++ & 0x1) << 2;
xmc[10] |= (*c >> 6) & 0x3;
xmc[11] = (*c >> 3) & 0x7;
xmc[12] = *c++ & 0x7;
Nc[1] = (*c >> 1) & 0x7F;
bc[1] = (*c++ & 0x1) << 1;
bc[1] |= (*c >> 7) & 0x1;
Mc[1] = (*c >> 5) & 0x3;
xmaxc[1] = (*c++ & 0x1F) << 1;
xmaxc[1] |= (*c >> 7) & 0x1;
xmc[13] = (*c >> 4) & 0x7;
xmc[14] = (*c >> 1) & 0x7;
xmc[15] = (*c++ & 0x1) << 2;
xmc[15] |= (*c >> 6) & 0x3;
xmc[16] = (*c >> 3) & 0x7;
xmc[17] = *c++ & 0x7;
xmc[18] = (*c >> 5) & 0x7;
xmc[19] = (*c >> 2) & 0x7;
xmc[20] = (*c++ & 0x3) << 1;
xmc[20] |= (*c >> 7) & 0x1;
xmc[21] = (*c >> 4) & 0x7;
xmc[22] = (*c >> 1) & 0x7;
xmc[23] = (*c++ & 0x1) << 2;
xmc[23] |= (*c >> 6) & 0x3;
xmc[24] = (*c >> 3) & 0x7;
xmc[25] = *c++ & 0x7;
Nc[2] = (*c >> 1) & 0x7F;
bc[2] = (*c++ & 0x1) << 1; /* 20 */
bc[2] |= (*c >> 7) & 0x1;
Mc[2] = (*c >> 5) & 0x3;
xmaxc[2] = (*c++ & 0x1F) << 1;
xmaxc[2] |= (*c >> 7) & 0x1;
xmc[26] = (*c >> 4) & 0x7;
xmc[27] = (*c >> 1) & 0x7;
xmc[28] = (*c++ & 0x1) << 2;
xmc[28] |= (*c >> 6) & 0x3;
xmc[29] = (*c >> 3) & 0x7;
xmc[30] = *c++ & 0x7;
xmc[31] = (*c >> 5) & 0x7;
xmc[32] = (*c >> 2) & 0x7;
xmc[33] = (*c++ & 0x3) << 1;
xmc[33] |= (*c >> 7) & 0x1;
xmc[34] = (*c >> 4) & 0x7;
xmc[35] = (*c >> 1) & 0x7;
xmc[36] = (*c++ & 0x1) << 2;
xmc[36] |= (*c >> 6) & 0x3;
xmc[37] = (*c >> 3) & 0x7;
xmc[38] = *c++ & 0x7;
Nc[3] = (*c >> 1) & 0x7F;
bc[3] = (*c++ & 0x1) << 1;
bc[3] |= (*c >> 7) & 0x1;
Mc[3] = (*c >> 5) & 0x3;
xmaxc[3] = (*c++ & 0x1F) << 1;
xmaxc[3] |= (*c >> 7) & 0x1;
xmc[39] = (*c >> 4) & 0x7;
xmc[40] = (*c >> 1) & 0x7;
xmc[41] = (*c++ & 0x1) << 2;
xmc[41] |= (*c >> 6) & 0x3;
xmc[42] = (*c >> 3) & 0x7;
xmc[43] = *c++ & 0x7; /* 30 */
xmc[44] = (*c >> 5) & 0x7;
xmc[45] = (*c >> 2) & 0x7;
xmc[46] = (*c++ & 0x3) << 1;
xmc[46] |= (*c >> 7) & 0x1;
xmc[47] = (*c >> 4) & 0x7;
xmc[48] = (*c >> 1) & 0x7;
xmc[49] = (*c++ & 0x1) << 2;
xmc[49] |= (*c >> 6) & 0x3;
xmc[50] = (*c >> 3) & 0x7;
xmc[51] = *c & 0x7; /* 33 */
}
Gsm_Decoder(s, LARc, Nc, bc, Mc, xmaxc, xmc, target);
return 0;
}
/****** begin "gsm_encode.c" *****/
void gsm_encode P3((s, source, c), gsm s, gsm_signal * source, gsm_byte * c)
{
word LARc[8], Nc[4], Mc[4], bc[4], xmaxc[4], xmc[13*4];
Gsm_Coder(s, source, LARc, Nc, bc, Mc, xmaxc, xmc);
/* variable size
GSM_MAGIC 4
LARc[0] 6
LARc[1] 6
LARc[2] 5
LARc[3] 5
LARc[4] 4
LARc[5] 4
LARc[6] 3
LARc[7] 3
Nc[0] 7
bc[0] 2
Mc[0] 2
xmaxc[0] 6
xmc[0] 3
xmc[1] 3
xmc[2] 3
xmc[3] 3
xmc[4] 3
xmc[5] 3
xmc[6] 3
xmc[7] 3
xmc[8] 3
xmc[9] 3
xmc[10] 3
xmc[11] 3
xmc[12] 3
Nc[1] 7
bc[1] 2
Mc[1] 2
xmaxc[1] 6
xmc[13] 3
xmc[14] 3
xmc[15] 3
xmc[16] 3
xmc[17] 3
xmc[18] 3
xmc[19] 3
xmc[20] 3
xmc[21] 3
xmc[22] 3
xmc[23] 3
xmc[24] 3
xmc[25] 3
Nc[2] 7
bc[2] 2
Mc[2] 2
xmaxc[2] 6
xmc[26] 3
xmc[27] 3
xmc[28] 3
xmc[29] 3
xmc[30] 3
xmc[31] 3
xmc[32] 3
xmc[33] 3
xmc[34] 3
xmc[35] 3
xmc[36] 3
xmc[37] 3
xmc[38] 3
Nc[3] 7
bc[3] 2
Mc[3] 2
xmaxc[3] 6
xmc[39] 3
xmc[40] 3
xmc[41] 3
xmc[42] 3
xmc[43] 3
xmc[44] 3
xmc[45] 3
xmc[46] 3
xmc[47] 3
xmc[48] 3
xmc[49] 3
xmc[50] 3
xmc[51] 3
*/
#ifdef WAV49
if (s->wav_fmt) {
s->frame_index = !s->frame_index;
if (s->frame_index) {
uword sr;
sr = 0;
sr = sr >> 6 | LARc[0] << 10;
sr = sr >> 6 | LARc[1] << 10;
*c++ = sr >> 4;
sr = sr >> 5 | LARc[2] << 11;
*c++ = sr >> 7;
sr = sr >> 5 | LARc[3] << 11;
sr = sr >> 4 | LARc[4] << 12;
*c++ = sr >> 6;
sr = sr >> 4 | LARc[5] << 12;
sr = sr >> 3 | LARc[6] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | LARc[7] << 13;
sr = sr >> 7 | Nc[0] << 9;
*c++ = sr >> 5;
sr = sr >> 2 | bc[0] << 14;
sr = sr >> 2 | Mc[0] << 14;
sr = sr >> 6 | xmaxc[0] << 10;
*c++ = sr >> 3;
sr = sr >> 3 | xmc[0] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[1] << 13;
sr = sr >> 3 | xmc[2] << 13;
sr = sr >> 3 | xmc[3] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[4] << 13;
sr = sr >> 3 | xmc[5] << 13;
sr = sr >> 3 | xmc[6] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[7] << 13;
sr = sr >> 3 | xmc[8] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[9] << 13;
sr = sr >> 3 | xmc[10] << 13;
sr = sr >> 3 | xmc[11] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[12] << 13;
sr = sr >> 7 | Nc[1] << 9;
*c++ = sr >> 5;
sr = sr >> 2 | bc[1] << 14;
sr = sr >> 2 | Mc[1] << 14;
sr = sr >> 6 | xmaxc[1] << 10;
*c++ = sr >> 3;
sr = sr >> 3 | xmc[13] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[14] << 13;
sr = sr >> 3 | xmc[15] << 13;
sr = sr >> 3 | xmc[16] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[17] << 13;
sr = sr >> 3 | xmc[18] << 13;
sr = sr >> 3 | xmc[19] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[20] << 13;
sr = sr >> 3 | xmc[21] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[22] << 13;
sr = sr >> 3 | xmc[23] << 13;
sr = sr >> 3 | xmc[24] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[25] << 13;
sr = sr >> 7 | Nc[2] << 9;
*c++ = sr >> 5;
sr = sr >> 2 | bc[2] << 14;
sr = sr >> 2 | Mc[2] << 14;
sr = sr >> 6 | xmaxc[2] << 10;
*c++ = sr >> 3;
sr = sr >> 3 | xmc[26] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[27] << 13;
sr = sr >> 3 | xmc[28] << 13;
sr = sr >> 3 | xmc[29] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[30] << 13;
sr = sr >> 3 | xmc[31] << 13;
sr = sr >> 3 | xmc[32] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[33] << 13;
sr = sr >> 3 | xmc[34] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[35] << 13;
sr = sr >> 3 | xmc[36] << 13;
sr = sr >> 3 | xmc[37] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[38] << 13;
sr = sr >> 7 | Nc[3] << 9;
*c++ = sr >> 5;
sr = sr >> 2 | bc[3] << 14;
sr = sr >> 2 | Mc[3] << 14;
sr = sr >> 6 | xmaxc[3] << 10;
*c++ = sr >> 3;
sr = sr >> 3 | xmc[39] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[40] << 13;
sr = sr >> 3 | xmc[41] << 13;
sr = sr >> 3 | xmc[42] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[43] << 13;
sr = sr >> 3 | xmc[44] << 13;
sr = sr >> 3 | xmc[45] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[46] << 13;
sr = sr >> 3 | xmc[47] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[48] << 13;
sr = sr >> 3 | xmc[49] << 13;
sr = sr >> 3 | xmc[50] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[51] << 13;
sr = sr >> 4;
*c = sr >> 8;
s->frame_chain = *c;
}
else {
uword sr;
sr = 0;
sr = sr >> 4 | s->frame_chain << 12;
sr = sr >> 6 | LARc[0] << 10;
*c++ = sr >> 6;
sr = sr >> 6 | LARc[1] << 10;
*c++ = sr >> 8;
sr = sr >> 5 | LARc[2] << 11;
sr = sr >> 5 | LARc[3] << 11;
*c++ = sr >> 6;
sr = sr >> 4 | LARc[4] << 12;
sr = sr >> 4 | LARc[5] << 12;
*c++ = sr >> 6;
sr = sr >> 3 | LARc[6] << 13;
sr = sr >> 3 | LARc[7] << 13;
*c++ = sr >> 8;
sr = sr >> 7 | Nc[0] << 9;
sr = sr >> 2 | bc[0] << 14;
*c++ = sr >> 7;
sr = sr >> 2 | Mc[0] << 14;
sr = sr >> 6 | xmaxc[0] << 10;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[0] << 13;
sr = sr >> 3 | xmc[1] << 13;
sr = sr >> 3 | xmc[2] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[3] << 13;
sr = sr >> 3 | xmc[4] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[5] << 13;
sr = sr >> 3 | xmc[6] << 13;
sr = sr >> 3 | xmc[7] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[8] << 13;
sr = sr >> 3 | xmc[9] << 13;
sr = sr >> 3 | xmc[10] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[11] << 13;
sr = sr >> 3 | xmc[12] << 13;
*c++ = sr >> 8;
sr = sr >> 7 | Nc[1] << 9;
sr = sr >> 2 | bc[1] << 14;
*c++ = sr >> 7;
sr = sr >> 2 | Mc[1] << 14;
sr = sr >> 6 | xmaxc[1] << 10;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[13] << 13;
sr = sr >> 3 | xmc[14] << 13;
sr = sr >> 3 | xmc[15] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[16] << 13;
sr = sr >> 3 | xmc[17] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[18] << 13;
sr = sr >> 3 | xmc[19] << 13;
sr = sr >> 3 | xmc[20] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[21] << 13;
sr = sr >> 3 | xmc[22] << 13;
sr = sr >> 3 | xmc[23] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[24] << 13;
sr = sr >> 3 | xmc[25] << 13;
*c++ = sr >> 8;
sr = sr >> 7 | Nc[2] << 9;
sr = sr >> 2 | bc[2] << 14;
*c++ = sr >> 7;
sr = sr >> 2 | Mc[2] << 14;
sr = sr >> 6 | xmaxc[2] << 10;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[26] << 13;
sr = sr >> 3 | xmc[27] << 13;
sr = sr >> 3 | xmc[28] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[29] << 13;
sr = sr >> 3 | xmc[30] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[31] << 13;
sr = sr >> 3 | xmc[32] << 13;
sr = sr >> 3 | xmc[33] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[34] << 13;
sr = sr >> 3 | xmc[35] << 13;
sr = sr >> 3 | xmc[36] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[37] << 13;
sr = sr >> 3 | xmc[38] << 13;
*c++ = sr >> 8;
sr = sr >> 7 | Nc[3] << 9;
sr = sr >> 2 | bc[3] << 14;
*c++ = sr >> 7;
sr = sr >> 2 | Mc[3] << 14;
sr = sr >> 6 | xmaxc[3] << 10;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[39] << 13;
sr = sr >> 3 | xmc[40] << 13;
sr = sr >> 3 | xmc[41] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[42] << 13;
sr = sr >> 3 | xmc[43] << 13;
*c++ = sr >> 8;
sr = sr >> 3 | xmc[44] << 13;
sr = sr >> 3 | xmc[45] << 13;
sr = sr >> 3 | xmc[46] << 13;
*c++ = sr >> 7;
sr = sr >> 3 | xmc[47] << 13;
sr = sr >> 3 | xmc[48] << 13;
sr = sr >> 3 | xmc[49] << 13;
*c++ = sr >> 6;
sr = sr >> 3 | xmc[50] << 13;
sr = sr >> 3 | xmc[51] << 13;
*c++ = sr >> 8;
}
}
else
#endif /* WAV49 */
{
*c++ = ((GSM_MAGIC & 0xF) << 4) /* 1 */
| ((LARc[0] >> 2) & 0xF);
*c++ = ((LARc[0] & 0x3) << 6)
| (LARc[1] & 0x3F);
*c++ = ((LARc[2] & 0x1F) << 3)
| ((LARc[3] >> 2) & 0x7);
*c++ = ((LARc[3] & 0x3) << 6)
| ((LARc[4] & 0xF) << 2)
| ((LARc[5] >> 2) & 0x3);
*c++ = ((LARc[5] & 0x3) << 6)
| ((LARc[6] & 0x7) << 3)
| (LARc[7] & 0x7);
*c++ = ((Nc[0] & 0x7F) << 1)
| ((bc[0] >> 1) & 0x1);
*c++ = ((bc[0] & 0x1) << 7)
| ((Mc[0] & 0x3) << 5)
| ((xmaxc[0] >> 1) & 0x1F);
*c++ = ((xmaxc[0] & 0x1) << 7)
| ((xmc[0] & 0x7) << 4)
| ((xmc[1] & 0x7) << 1)
| ((xmc[2] >> 2) & 0x1);
*c++ = ((xmc[2] & 0x3) << 6)
| ((xmc[3] & 0x7) << 3)
| (xmc[4] & 0x7);
*c++ = ((xmc[5] & 0x7) << 5) /* 10 */
| ((xmc[6] & 0x7) << 2)
| ((xmc[7] >> 1) & 0x3);
*c++ = ((xmc[7] & 0x1) << 7)
| ((xmc[8] & 0x7) << 4)
| ((xmc[9] & 0x7) << 1)
| ((xmc[10] >> 2) & 0x1);
*c++ = ((xmc[10] & 0x3) << 6)
| ((xmc[11] & 0x7) << 3)
| (xmc[12] & 0x7);
*c++ = ((Nc[1] & 0x7F) << 1)
| ((bc[1] >> 1) & 0x1);
*c++ = ((bc[1] & 0x1) << 7)
| ((Mc[1] & 0x3) << 5)
| ((xmaxc[1] >> 1) & 0x1F);
*c++ = ((xmaxc[1] & 0x1) << 7)
| ((xmc[13] & 0x7) << 4)
| ((xmc[14] & 0x7) << 1)
| ((xmc[15] >> 2) & 0x1);
*c++ = ((xmc[15] & 0x3) << 6)
| ((xmc[16] & 0x7) << 3)
| (xmc[17] & 0x7);
*c++ = ((xmc[18] & 0x7) << 5)
| ((xmc[19] & 0x7) << 2)
| ((xmc[20] >> 1) & 0x3);
*c++ = ((xmc[20] & 0x1) << 7)
| ((xmc[21] & 0x7) << 4)
| ((xmc[22] & 0x7) << 1)
| ((xmc[23] >> 2) & 0x1);
*c++ = ((xmc[23] & 0x3) << 6)
| ((xmc[24] & 0x7) << 3)
| (xmc[25] & 0x7);
*c++ = ((Nc[2] & 0x7F) << 1) /* 20 */
| ((bc[2] >> 1) & 0x1);
*c++ = ((bc[2] & 0x1) << 7)
| ((Mc[2] & 0x3) << 5)
| ((xmaxc[2] >> 1) & 0x1F);
*c++ = ((xmaxc[2] & 0x1) << 7)
| ((xmc[26] & 0x7) << 4)
| ((xmc[27] & 0x7) << 1)
| ((xmc[28] >> 2) & 0x1);
*c++ = ((xmc[28] & 0x3) << 6)
| ((xmc[29] & 0x7) << 3)
| (xmc[30] & 0x7);
*c++ = ((xmc[31] & 0x7) << 5)
| ((xmc[32] & 0x7) << 2)
| ((xmc[33] >> 1) & 0x3);
*c++ = ((xmc[33] & 0x1) << 7)
| ((xmc[34] & 0x7) << 4)
| ((xmc[35] & 0x7) << 1)
| ((xmc[36] >> 2) & 0x1);
*c++ = ((xmc[36] & 0x3) << 6)
| ((xmc[37] & 0x7) << 3)
| (xmc[38] & 0x7);
*c++ = ((Nc[3] & 0x7F) << 1)
| ((bc[3] >> 1) & 0x1);
*c++ = ((bc[3] & 0x1) << 7)
| ((Mc[3] & 0x3) << 5)
| ((xmaxc[3] >> 1) & 0x1F);
*c++ = ((xmaxc[3] & 0x1) << 7)
| ((xmc[39] & 0x7) << 4)
| ((xmc[40] & 0x7) << 1)
| ((xmc[41] >> 2) & 0x1);
*c++ = ((xmc[41] & 0x3) << 6) /* 30 */
| ((xmc[42] & 0x7) << 3)
| (xmc[43] & 0x7);
*c++ = ((xmc[44] & 0x7) << 5)
| ((xmc[45] & 0x7) << 2)
| ((xmc[46] >> 1) & 0x3);
*c++ = ((xmc[46] & 0x1) << 7)
| ((xmc[47] & 0x7) << 4)
| ((xmc[48] & 0x7) << 1)
| ((xmc[49] >> 2) & 0x1);
*c++ = ((xmc[49] & 0x3) << 6)
| ((xmc[50] & 0x7) << 3)
| (xmc[51] & 0x7);
}
}
/****** begin "long_term.c" *****/
/*
* 4.2.11 .. 4.2.12 LONG TERM PREDICTOR (LTP) SECTION
*/
/*
* This module computes the LTP gain (bc) and the LTP lag (Nc)
* for the long term analysis filter. This is done by calculating a
* maximum of the cross-correlation function between the current
* sub-segment short term residual signal d[0..39] (output of
* the short term analysis filter; for simplification the index
* of this array begins at 0 and ends at 39 for each sub-segment of the
* RPE-LTP analysis) and the previous reconstructed short term
* residual signal dp[ -120 .. -1 ]. A dynamic scaling must be
* performed to avoid overflow.
*/
/* The next procedure exists in six versions. First two integer
* version (if USE_FLOAT_MUL is not defined); then four floating
* point versions, twice with proper scaling (USE_FLOAT_MUL defined),
* once without (USE_FLOAT_MUL and FAST defined, and fast run-time
* option used). Every pair has first a Cut version (see the -C
* option to toast or the LTP_CUT option to gsm_option()), then the
* uncut one. (For a detailed explanation of why this is altogether
* a bad idea, see Henry Spencer and Geoff Collyer, ``#ifdef Considered
* Harmful''.)
*/
#ifndef USE_FLOAT_MUL
#ifdef LTP_CUT
static void Cut_Calculation_of_the_LTP_parameters P5((st, d,dp,bc_out,Nc_out),
struct gsm_state * st,
register word * d, /* [0..39] IN */
register word * dp, /* [-120..-1] IN */
word * bc_out, /* OUT */
word * Nc_out /* OUT */
)
{
register int k, lambda;
word Nc, bc;
word wt[40];
longword L_result;
longword L_max, L_power;
word R, S, dmax, scal, best_k;
word ltp_cut;
register word temp, wt_k;
/* Search of the optimum scaling of d[0..39].
*/
dmax = 0;
for (k = 0; k <= 39; k++) {
temp = d[k];
temp = GSM_ABS( temp );
if (temp > dmax) {
dmax = temp;
best_k = k;
}
}
temp = 0;
if (dmax == 0) scal = 0;
else {
assert(dmax > 0);
temp = gsm_norm( (longword)dmax << 16 );
}
if (temp > 6) scal = 0;
else scal = 6 - temp;
assert(scal >= 0);
/* Search for the maximum cross-correlation and coding of the LTP lag
*/
L_max = 0;
Nc = 40; /* index for the maximum cross-correlation */
wt_k = SASR(d[best_k], scal);
for (lambda = 40; lambda <= 120; lambda++) {
L_result = (longword)wt_k * dp[best_k - lambda];
if (L_result > L_max) {
Nc = lambda;
L_max = L_result;
}
}
*Nc_out = Nc;
L_max <<= 1;
/* Rescaling of L_max
*/
assert(scal <= 100 && scal >= -100);
L_max = L_max >> (6 - scal); /* sub(6, scal) */
assert( Nc <= 120 && Nc >= 40);
/* Compute the power of the reconstructed short term residual
* signal dp[..]
*/
L_power = 0;
for (k = 0; k <= 39; k++) {
register longword L_temp;
L_temp = SASR( dp[k - Nc], 3 );
L_power += L_temp * L_temp;
}
L_power <<= 1; /* from L_MULT */
/* Normalization of L_max and L_power
*/
if (L_max <= 0) {
*bc_out = 0;
return;
}
if (L_max >= L_power) {
*bc_out = 3;
return;
}
temp = gsm_norm( L_power );
R = SASR( L_max << temp, 16 );
S = SASR( L_power << temp, 16 );
/* Coding of the LTP gain
*/
/* Table 4.3a must be used to obtain the level DLB[i] for the
* quantization of the LTP gain b to get the coded version bc.
*/
for (bc = 0; bc <= 2; bc++) if (R <= gsm_mult(S, gsm_DLB[bc])) break;
*bc_out = bc;
}
#endif /* LTP_CUT */
static void Calculation_of_the_LTP_parameters P4((d,dp,bc_out,Nc_out),
register word * d, /* [0..39] IN */
register word * dp, /* [-120..-1] IN */
word * bc_out, /* OUT */
word * Nc_out /* OUT */
)
{
register int k, lambda;
word Nc, bc;
word wt[40];
longword L_max, L_power;
word R, S, dmax, scal;
register word temp;
/* Search of the optimum scaling of d[0..39].
*/
dmax = 0;
for (k = 0; k <= 39; k++) {
temp = d[k];
temp = GSM_ABS( temp );
if (temp > dmax) dmax = temp;
}
temp = 0;
if (dmax == 0) scal = 0;
else {
assert(dmax > 0);
temp = gsm_norm( (longword)dmax << 16 );
}
if (temp > 6) scal = 0;
else scal = 6 - temp;
assert(scal >= 0);
/* Initialization of a working array wt
*/
for (k = 0; k <= 39; k++) wt[k] = SASR( d[k], scal );
/* Search for the maximum cross-correlation and coding of the LTP lag
*/
L_max = 0;
Nc = 40; /* index for the maximum cross-correlation */
for (lambda = 40; lambda <= 120; lambda++) {
# undef STEP
# define STEP(k) (longword)wt[k] * dp[k - lambda]
register longword L_result;
L_result = STEP(0) ; L_result += STEP(1) ;
L_result += STEP(2) ; L_result += STEP(3) ;
L_result += STEP(4) ; L_result += STEP(5) ;
L_result += STEP(6) ; L_result += STEP(7) ;
L_result += STEP(8) ; L_result += STEP(9) ;
L_result += STEP(10) ; L_result += STEP(11) ;
L_result += STEP(12) ; L_result += STEP(13) ;
L_result += STEP(14) ; L_result += STEP(15) ;
L_result += STEP(16) ; L_result += STEP(17) ;
L_result += STEP(18) ; L_result += STEP(19) ;
L_result += STEP(20) ; L_result += STEP(21) ;
L_result += STEP(22) ; L_result += STEP(23) ;
L_result += STEP(24) ; L_result += STEP(25) ;
L_result += STEP(26) ; L_result += STEP(27) ;
L_result += STEP(28) ; L_result += STEP(29) ;
L_result += STEP(30) ; L_result += STEP(31) ;
L_result += STEP(32) ; L_result += STEP(33) ;
L_result += STEP(34) ; L_result += STEP(35) ;
L_result += STEP(36) ; L_result += STEP(37) ;
L_result += STEP(38) ; L_result += STEP(39) ;
if (L_result > L_max) {
Nc = lambda;
L_max = L_result;
}
}
*Nc_out = Nc;
L_max <<= 1;
/* Rescaling of L_max
*/
assert(scal <= 100 && scal >= -100);
L_max = L_max >> (6 - scal); /* sub(6, scal) */
assert( Nc <= 120 && Nc >= 40);
/* Compute the power of the reconstructed short term residual
* signal dp[..]
*/
L_power = 0;
for (k = 0; k <= 39; k++) {
register longword L_temp;
L_temp = SASR( dp[k - Nc], 3 );
L_power += L_temp * L_temp;
}
L_power <<= 1; /* from L_MULT */
/* Normalization of L_max and L_power
*/
if (L_max <= 0) {
*bc_out = 0;
return;
}
if (L_max >= L_power) {
*bc_out = 3;
return;
}
temp = gsm_norm( L_power );
R = SASR( L_max << temp, 16 );
S = SASR( L_power << temp, 16 );
/* Coding of the LTP gain
*/
/* Table 4.3a must be used to obtain the level DLB[i] for the
* quantization of the LTP gain b to get the coded version bc.
*/
for (bc = 0; bc <= 2; bc++) if (R <= gsm_mult(S, gsm_DLB[bc])) break;
*bc_out = bc;
}
#else /* USE_FLOAT_MUL */
#ifdef LTP_CUT
static void Cut_Calculation_of_the_LTP_parameters P5((st, d,dp,bc_out,Nc_out),
struct gsm_state * st, /* IN */
register word * d, /* [0..39] IN */
register word * dp, /* [-120..-1] IN */
word * bc_out, /* OUT */
word * Nc_out /* OUT */
)
{
register int k, lambda;
word Nc, bc;
word ltp_cut;
float wt_float[40];
float dp_float_base[120], * dp_float = dp_float_base + 120;
longword L_max, L_power;
word R, S, dmax, scal;
register word temp;
/* Search of the optimum scaling of d[0..39].
*/
dmax = 0;
for (k = 0; k <= 39; k++) {
temp = d[k];
temp = GSM_ABS( temp );
if (temp > dmax) dmax = temp;
}
temp = 0;
if (dmax == 0) scal = 0;
else {
assert(dmax > 0);
temp = gsm_norm( (longword)dmax << 16 );
}
if (temp > 6) scal = 0;
else scal = 6 - temp;
assert(scal >= 0);
ltp_cut = (longword)SASR(dmax, scal) * st->ltp_cut / 100;
/* Initialization of a working array wt
*/
for (k = 0; k < 40; k++) {
register word w = SASR( d[k], scal );
if (w < 0 ? w > -ltp_cut : w < ltp_cut) {
wt_float[k] = 0.0;
}
else {
wt_float[k] = w;
}
}
for (k = -120; k < 0; k++) dp_float[k] = dp[k];
/* Search for the maximum cross-correlation and coding of the LTP lag
*/
L_max = 0;
Nc = 40; /* index for the maximum cross-correlation */
for (lambda = 40; lambda <= 120; lambda += 9) {
/* Calculate L_result for l = lambda .. lambda + 9.
*/
register float *lp = dp_float - lambda;
register float W;
register float a = lp[-8], b = lp[-7], c = lp[-6],
d = lp[-5], e = lp[-4], f = lp[-3],
g = lp[-2], h = lp[-1];
register float E;
register float S0 = 0, S1 = 0, S2 = 0, S3 = 0, S4 = 0,
S5 = 0, S6 = 0, S7 = 0, S8 = 0;
# undef STEP
# define STEP(K, a, b, c, d, e, f, g, h) \
if ((W = wt_float[K]) != 0.0) { \
E = W * a; S8 += E; \
E = W * b; S7 += E; \
E = W * c; S6 += E; \
E = W * d; S5 += E; \
E = W * e; S4 += E; \
E = W * f; S3 += E; \
E = W * g; S2 += E; \
E = W * h; S1 += E; \
a = lp[K]; \
E = W * a; S0 += E; } else (a = lp[K])
# define STEP_A(K) STEP(K, a, b, c, d, e, f, g, h)
# define STEP_B(K) STEP(K, b, c, d, e, f, g, h, a)
# define STEP_C(K) STEP(K, c, d, e, f, g, h, a, b)
# define STEP_D(K) STEP(K, d, e, f, g, h, a, b, c)
# define STEP_E(K) STEP(K, e, f, g, h, a, b, c, d)
# define STEP_F(K) STEP(K, f, g, h, a, b, c, d, e)
# define STEP_G(K) STEP(K, g, h, a, b, c, d, e, f)
# define STEP_H(K) STEP(K, h, a, b, c, d, e, f, g)
STEP_A( 0); STEP_B( 1); STEP_C( 2); STEP_D( 3);
STEP_E( 4); STEP_F( 5); STEP_G( 6); STEP_H( 7);
STEP_A( 8); STEP_B( 9); STEP_C(10); STEP_D(11);
STEP_E(12); STEP_F(13); STEP_G(14); STEP_H(15);
STEP_A(16); STEP_B(17); STEP_C(18); STEP_D(19);
STEP_E(20); STEP_F(21); STEP_G(22); STEP_H(23);
STEP_A(24); STEP_B(25); STEP_C(26); STEP_D(27);
STEP_E(28); STEP_F(29); STEP_G(30); STEP_H(31);
STEP_A(32); STEP_B(33); STEP_C(34); STEP_D(35);
STEP_E(36); STEP_F(37); STEP_G(38); STEP_H(39);
if (S0 > L_max) { L_max = S0; Nc = lambda; }
if (S1 > L_max) { L_max = S1; Nc = lambda + 1; }
if (S2 > L_max) { L_max = S2; Nc = lambda + 2; }
if (S3 > L_max) { L_max = S3; Nc = lambda + 3; }
if (S4 > L_max) { L_max = S4; Nc = lambda + 4; }
if (S5 > L_max) { L_max = S5; Nc = lambda + 5; }
if (S6 > L_max) { L_max = S6; Nc = lambda + 6; }
if (S7 > L_max) { L_max = S7; Nc = lambda + 7; }
if (S8 > L_max) { L_max = S8; Nc = lambda + 8; }
}
*Nc_out = Nc;
L_max <<= 1;
/* Rescaling of L_max
*/
assert(scal <= 100 && scal >= -100);
L_max = L_max >> (6 - scal); /* sub(6, scal) */
assert( Nc <= 120 && Nc >= 40);
/* Compute the power of the reconstructed short term residual
* signal dp[..]
*/
L_power = 0;
for (k = 0; k <= 39; k++) {
register longword L_temp;
L_temp = SASR( dp[k - Nc], 3 );
L_power += L_temp * L_temp;
}
L_power <<= 1; /* from L_MULT */
/* Normalization of L_max and L_power
*/
if (L_max <= 0) {
*bc_out = 0;
return;
}
if (L_max >= L_power) {
*bc_out = 3;
return;
}
temp = gsm_norm( L_power );
R = SASR( L_max << temp, 16 );
S = SASR( L_power << temp, 16 );
/* Coding of the LTP gain
*/
/* Table 4.3a must be used to obtain the level DLB[i] for the
* quantization of the LTP gain b to get the coded version bc.
*/
for (bc = 0; bc <= 2; bc++) if (R <= gsm_mult(S, gsm_DLB[bc])) break;
*bc_out = bc;
}
#endif /* LTP_CUT */
static void Calculation_of_the_LTP_parameters P4((d,dp,bc_out,Nc_out),
register word * d, /* [0..39] IN */
register word * dp, /* [-120..-1] IN */
word * bc_out, /* OUT */
word * Nc_out /* OUT */
)
{
register int k, lambda;
word Nc, bc;
float wt_float[40];
float dp_float_base[120], * dp_float = dp_float_base + 120;
longword L_max, L_power;
word R, S, dmax, scal;
register word temp;
/* Search of the optimum scaling of d[0..39].
*/
dmax = 0;
for (k = 0; k <= 39; k++) {
temp = d[k];
temp = GSM_ABS( temp );
if (temp > dmax) dmax = temp;
}
temp = 0;
if (dmax == 0) scal = 0;
else {
assert(dmax > 0);
temp = gsm_norm( (longword)dmax << 16 );
}
if (temp > 6) scal = 0;
else scal = 6 - temp;
assert(scal >= 0);
/* Initialization of a working array wt
*/
for (k = 0; k < 40; k++) wt_float[k] = SASR( d[k], scal );
for (k = -120; k < 0; k++) dp_float[k] = dp[k];
/* Search for the maximum cross-correlation and coding of the LTP lag
*/
L_max = 0;
Nc = 40; /* index for the maximum cross-correlation */
for (lambda = 40; lambda <= 120; lambda += 9) {
/* Calculate L_result for l = lambda .. lambda + 9.
*/
register float *lp = dp_float - lambda;
register float W;
register float a = lp[-8], b = lp[-7], c = lp[-6],
d = lp[-5], e = lp[-4], f = lp[-3],
g = lp[-2], h = lp[-1];
register float E;
register float S0 = 0, S1 = 0, S2 = 0, S3 = 0, S4 = 0,
S5 = 0, S6 = 0, S7 = 0, S8 = 0;
# undef STEP
# define STEP(K, a, b, c, d, e, f, g, h) \
W = wt_float[K]; \
E = W * a; S8 += E; \
E = W * b; S7 += E; \
E = W * c; S6 += E; \
E = W * d; S5 += E; \
E = W * e; S4 += E; \
E = W * f; S3 += E; \
E = W * g; S2 += E; \
E = W * h; S1 += E; \
a = lp[K]; \
E = W * a; S0 += E
# define STEP_A(K) STEP(K, a, b, c, d, e, f, g, h)
# define STEP_B(K) STEP(K, b, c, d, e, f, g, h, a)
# define STEP_C(K) STEP(K, c, d, e, f, g, h, a, b)
# define STEP_D(K) STEP(K, d, e, f, g, h, a, b, c)
# define STEP_E(K) STEP(K, e, f, g, h, a, b, c, d)
# define STEP_F(K) STEP(K, f, g, h, a, b, c, d, e)
# define STEP_G(K) STEP(K, g, h, a, b, c, d, e, f)
# define STEP_H(K) STEP(K, h, a, b, c, d, e, f, g)
STEP_A( 0); STEP_B( 1); STEP_C( 2); STEP_D( 3);
STEP_E( 4); STEP_F( 5); STEP_G( 6); STEP_H( 7);
STEP_A( 8); STEP_B( 9); STEP_C(10); STEP_D(11);
STEP_E(12); STEP_F(13); STEP_G(14); STEP_H(15);
STEP_A(16); STEP_B(17); STEP_C(18); STEP_D(19);
STEP_E(20); STEP_F(21); STEP_G(22); STEP_H(23);
STEP_A(24); STEP_B(25); STEP_C(26); STEP_D(27);
STEP_E(28); STEP_F(29); STEP_G(30); STEP_H(31);
STEP_A(32); STEP_B(33); STEP_C(34); STEP_D(35);
STEP_E(36); STEP_F(37); STEP_G(38); STEP_H(39);
if (S0 > L_max) { L_max = S0; Nc = lambda; }
if (S1 > L_max) { L_max = S1; Nc = lambda + 1; }
if (S2 > L_max) { L_max = S2; Nc = lambda + 2; }
if (S3 > L_max) { L_max = S3; Nc = lambda + 3; }
if (S4 > L_max) { L_max = S4; Nc = lambda + 4; }
if (S5 > L_max) { L_max = S5; Nc = lambda + 5; }
if (S6 > L_max) { L_max = S6; Nc = lambda + 6; }
if (S7 > L_max) { L_max = S7; Nc = lambda + 7; }
if (S8 > L_max) { L_max = S8; Nc = lambda + 8; }
}
*Nc_out = Nc;
L_max <<= 1;
/* Rescaling of L_max
*/
assert(scal <= 100 && scal >= -100);
L_max = L_max >> (6 - scal); /* sub(6, scal) */
assert( Nc <= 120 && Nc >= 40);
/* Compute the power of the reconstructed short term residual
* signal dp[..]
*/
L_power = 0;
for (k = 0; k <= 39; k++) {
register longword L_temp;
L_temp = SASR( dp[k - Nc], 3 );
L_power += L_temp * L_temp;
}
L_power <<= 1; /* from L_MULT */
/* Normalization of L_max and L_power
*/
if (L_max <= 0) {
*bc_out = 0;
return;
}
if (L_max >= L_power) {
*bc_out = 3;
return;
}
temp = gsm_norm( L_power );
R = SASR( L_max << temp, 16 );
S = SASR( L_power << temp, 16 );
/* Coding of the LTP gain
*/
/* Table 4.3a must be used to obtain the level DLB[i] for the
* quantization of the LTP gain b to get the coded version bc.
*/
for (bc = 0; bc <= 2; bc++) if (R <= gsm_mult(S, gsm_DLB[bc])) break;
*bc_out = bc;
}
#ifdef FAST
#ifdef LTP_CUT
static void Cut_Fast_Calculation_of_the_LTP_parameters P5((st,
d,dp,bc_out,Nc_out),
struct gsm_state * st, /* IN */
register word * d, /* [0..39] IN */
register word * dp, /* [-120..-1] IN */
word * bc_out, /* OUT */
word * Nc_out /* OUT */
)
{
register int k, lambda;
register float wt_float;
word Nc, bc;
word wt_max, best_k, ltp_cut;
float dp_float_base[120], * dp_float = dp_float_base + 120;
register float L_result, L_max, L_power;
wt_max = 0;
for (k = 0; k < 40; ++k) {
if ( d[k] > wt_max) wt_max = d[best_k = k];
else if (-d[k] > wt_max) wt_max = -d[best_k = k];
}
assert(wt_max >= 0);
wt_float = (float)wt_max;
for (k = -120; k < 0; ++k) dp_float[k] = (float)dp[k];
/* Search for the maximum cross-correlation and coding of the LTP lag
*/
L_max = 0;
Nc = 40; /* index for the maximum cross-correlation */
for (lambda = 40; lambda <= 120; lambda++) {
L_result = wt_float * dp_float[best_k - lambda];
if (L_result > L_max) {
Nc = lambda;
L_max = L_result;
}
}
*Nc_out = Nc;
if (L_max <= 0.) {
*bc_out = 0;
return;
}
/* Compute the power of the reconstructed short term residual
* signal dp[..]
*/
dp_float -= Nc;
L_power = 0;
for (k = 0; k < 40; ++k) {
register float f = dp_float[k];
L_power += f * f;
}
if (L_max >= L_power) {
*bc_out = 3;
return;
}
/* Coding of the LTP gain
* Table 4.3a must be used to obtain the level DLB[i] for the
* quantization of the LTP gain b to get the coded version bc.
*/
lambda = L_max / L_power * 32768.;
for (bc = 0; bc <= 2; ++bc) if (lambda <= gsm_DLB[bc]) break;
*bc_out = bc;
}
#endif /* LTP_CUT */
static void Fast_Calculation_of_the_LTP_parameters P4((d,dp,bc_out,Nc_out),
register word * d, /* [0..39] IN */
register word * dp, /* [-120..-1] IN */
word * bc_out, /* OUT */
word * Nc_out /* OUT */
)
{
register int k, lambda;
word Nc, bc;
float wt_float[40];
float dp_float_base[120], * dp_float = dp_float_base + 120;
register float L_max, L_power;
for (k = 0; k < 40; ++k) wt_float[k] = (float)d[k];
for (k = -120; k < 0; ++k) dp_float[k] = (float)dp[k];
/* Search for the maximum cross-correlation and coding of the LTP lag
*/
L_max = 0;
Nc = 40; /* index for the maximum cross-correlation */
for (lambda = 40; lambda <= 120; lambda += 9) {
/* Calculate L_result for l = lambda .. lambda + 9.
*/
register float *lp = dp_float - lambda;
register float W;
register float a = lp[-8], b = lp[-7], c = lp[-6],
d = lp[-5], e = lp[-4], f = lp[-3],
g = lp[-2], h = lp[-1];
register float E;
register float S0 = 0, S1 = 0, S2 = 0, S3 = 0, S4 = 0,
S5 = 0, S6 = 0, S7 = 0, S8 = 0;
# undef STEP
# define STEP(K, a, b, c, d, e, f, g, h) \
W = wt_float[K]; \
E = W * a; S8 += E; \
E = W * b; S7 += E; \
E = W * c; S6 += E; \
E = W * d; S5 += E; \
E = W * e; S4 += E; \
E = W * f; S3 += E; \
E = W * g; S2 += E; \
E = W * h; S1 += E; \
a = lp[K]; \
E = W * a; S0 += E
# define STEP_A(K) STEP(K, a, b, c, d, e, f, g, h)
# define STEP_B(K) STEP(K, b, c, d, e, f, g, h, a)
# define STEP_C(K) STEP(K, c, d, e, f, g, h, a, b)
# define STEP_D(K) STEP(K, d, e, f, g, h, a, b, c)
# define STEP_E(K) STEP(K, e, f, g, h, a, b, c, d)
# define STEP_F(K) STEP(K, f, g, h, a, b, c, d, e)
# define STEP_G(K) STEP(K, g, h, a, b, c, d, e, f)
# define STEP_H(K) STEP(K, h, a, b, c, d, e, f, g)
STEP_A( 0); STEP_B( 1); STEP_C( 2); STEP_D( 3);
STEP_E( 4); STEP_F( 5); STEP_G( 6); STEP_H( 7);
STEP_A( 8); STEP_B( 9); STEP_C(10); STEP_D(11);
STEP_E(12); STEP_F(13); STEP_G(14); STEP_H(15);
STEP_A(16); STEP_B(17); STEP_C(18); STEP_D(19);
STEP_E(20); STEP_F(21); STEP_G(22); STEP_H(23);
STEP_A(24); STEP_B(25); STEP_C(26); STEP_D(27);
STEP_E(28); STEP_F(29); STEP_G(30); STEP_H(31);
STEP_A(32); STEP_B(33); STEP_C(34); STEP_D(35);
STEP_E(36); STEP_F(37); STEP_G(38); STEP_H(39);
if (S0 > L_max) { L_max = S0; Nc = lambda; }
if (S1 > L_max) { L_max = S1; Nc = lambda + 1; }
if (S2 > L_max) { L_max = S2; Nc = lambda + 2; }
if (S3 > L_max) { L_max = S3; Nc = lambda + 3; }
if (S4 > L_max) { L_max = S4; Nc = lambda + 4; }
if (S5 > L_max) { L_max = S5; Nc = lambda + 5; }
if (S6 > L_max) { L_max = S6; Nc = lambda + 6; }
if (S7 > L_max) { L_max = S7; Nc = lambda + 7; }
if (S8 > L_max) { L_max = S8; Nc = lambda + 8; }
}
*Nc_out = Nc;
if (L_max <= 0.) {
*bc_out = 0;
return;
}
/* Compute the power of the reconstructed short term residual
* signal dp[..]
*/
dp_float -= Nc;
L_power = 0;
for (k = 0; k < 40; ++k) {
register float f = dp_float[k];
L_power += f * f;
}
if (L_max >= L_power) {
*bc_out = 3;
return;
}
/* Coding of the LTP gain
* Table 4.3a must be used to obtain the level DLB[i] for the
* quantization of the LTP gain b to get the coded version bc.
*/
lambda = L_max / L_power * 32768.;
for (bc = 0; bc <= 2; ++bc) if (lambda <= gsm_DLB[bc]) break;
*bc_out = bc;
}
#endif /* FAST */
#endif /* USE_FLOAT_MUL */
/* 4.2.12 */
static void Long_term_analysis_filtering P6((bc,Nc,dp,d,dpp,e),
word bc, /* IN */
word Nc, /* IN */
register word * dp, /* previous d [-120..-1] IN */
register word * d, /* d [0..39] IN */
register word * dpp, /* estimate [0..39] OUT */
register word * e /* long term res. signal [0..39] OUT */
)
/*
* In this part, we have to decode the bc parameter to compute
* the samples of the estimate dpp[0..39]. The decoding of bc needs the
* use of table 4.3b. The long term residual signal e[0..39]
* is then calculated to be fed to the RPE encoding section.
*/
{
register int k;
register longword ltmp;
# undef STEP
# define STEP(BP) \
for (k = 0; k <= 39; k++) { \
dpp[k] = GSM_MULT_R( BP, dp[k - Nc]); \
e[k] = GSM_SUB( d[k], dpp[k] ); \
}
switch (bc) {
case 0: STEP( 3277 ); break;
case 1: STEP( 11469 ); break;
case 2: STEP( 21299 ); break;
case 3: STEP( 32767 ); break;
}
}
void Gsm_Long_Term_Predictor P7((S,d,dp,e,dpp,Nc,bc), /* 4x for 160 samples */
struct gsm_state * S,
word * d, /* [0..39] residual signal IN */
word * dp, /* [-120..-1] d' IN */
word * e, /* [0..39] OUT */
word * dpp, /* [0..39] OUT */
word * Nc, /* correlation lag OUT */
word * bc /* gain factor OUT */
)
{
assert( d ); assert( dp ); assert( e );
assert( dpp); assert( Nc ); assert( bc );
#if defined(FAST) && defined(USE_FLOAT_MUL)
if (S->fast)
#if defined (LTP_CUT)
if (S->ltp_cut)
Cut_Fast_Calculation_of_the_LTP_parameters(S,
d, dp, bc, Nc);
else
#endif /* LTP_CUT */
Fast_Calculation_of_the_LTP_parameters(d, dp, bc, Nc );
else
#endif /* FAST & USE_FLOAT_MUL */
#ifdef LTP_CUT
if (S->ltp_cut)
Cut_Calculation_of_the_LTP_parameters(S, d, dp, bc, Nc);
else
#endif
Calculation_of_the_LTP_parameters(d, dp, bc, Nc);
Long_term_analysis_filtering( *bc, *Nc, dp, d, dpp, e );
}
/* 4.3.2 */
void Gsm_Long_Term_Synthesis_Filtering P5((S,Ncr,bcr,erp,drp),
struct gsm_state * S,
word Ncr,
word bcr,
register word * erp, /* [0..39] IN */
register word * drp /* [-120..-1] IN, [-120..40] OUT */
)
/*
* This procedure uses the bcr and Ncr parameter to realize the
* long term synthesis filtering. The decoding of bcr needs
* table 4.3b.
*/
{
register longword ltmp; /* for ADD */
register int k;
word brp, drpp, Nr;
/* Check the limits of Nr.
*/
Nr = Ncr < 40 || Ncr > 120 ? S->nrp : Ncr;
S->nrp = Nr;
assert(Nr >= 40 && Nr <= 120);
/* Decoding of the LTP gain bcr
*/
brp = gsm_QLB[ bcr ];
/* Computation of the reconstructed short term residual
* signal drp[0..39]
*/
assert(brp != MIN_WORD);
for (k = 0; k <= 39; k++) {
drpp = GSM_MULT_R( brp, drp[ k - Nr ] );
drp[k] = GSM_ADD( erp[k], drpp );
}
/*
* Update of the reconstructed short term residual signal
* drp[ -1..-120 ]
*/
for (k = 0; k <= 119; k++) drp[ -120 + k ] = drp[ -80 + k ];
}
/****** begin "lpc.c" *****/
#undef STEP
#undef P
/*
* 4.2.4 .. 4.2.7 LPC ANALYSIS SECTION
*/
/* 4.2.4 */
static void Autocorrelation P2((s, L_ACF),
word * s, /* [0..159] IN/OUT */
longword * L_ACF) /* [0..8] OUT */
/*
* The goal is to compute the array L_ACF[k]. The signal s[i] must
* be scaled in order to avoid an overflow situation.
*/
{
register int k, i;
word temp, smax, scalauto;
#ifdef USE_FLOAT_MUL
float float_s[160];
#endif
/* Dynamic scaling of the array s[0..159]
*/
/* Search for the maximum.
*/
smax = 0;
for (k = 0; k <= 159; k++) {
temp = GSM_ABS( s[k] );
if (temp > smax) smax = temp;
}
/* Computation of the scaling factor.
*/
if (smax == 0) scalauto = 0;
else {
assert(smax > 0);
scalauto = 4 - gsm_norm( (longword)smax << 16 );/* sub(4,..) */
}
/* Scaling of the array s[0...159]
*/
if (scalauto > 0) {
# ifdef USE_FLOAT_MUL
# define SCALE(n) \
case n: for (k = 0; k <= 159; k++) \
float_s[k] = (float) \
(s[k] = GSM_MULT_R(s[k], 16384 >> (n-1)));\
break;
# else
# define SCALE(n) \
case n: for (k = 0; k <= 159; k++) \
s[k] = GSM_MULT_R( s[k], 16384 >> (n-1) );\
break;
# endif /* USE_FLOAT_MUL */
switch (scalauto) {
SCALE(1)
SCALE(2)
SCALE(3)
SCALE(4)
}
# undef SCALE
}
# ifdef USE_FLOAT_MUL
else for (k = 0; k <= 159; k++) float_s[k] = (float) s[k];
# endif
/* Compute the L_ACF[..].
*/
{
# ifdef USE_FLOAT_MUL
register float * sp = float_s;
register float sl = *sp;
# define STEP(k) L_ACF[k] += (longword)(sl * sp[ -(k) ]);
# else
word * sp = s;
word sl = *sp;
# define STEP(k) L_ACF[k] += ((longword)sl * sp[ -(k) ]);
# endif
# define NEXTI sl = *++sp
for (k = 9; k--; L_ACF[k] = 0) ;
STEP (0);
NEXTI;
STEP(0); STEP(1);
NEXTI;
STEP(0); STEP(1); STEP(2);
NEXTI;
STEP(0); STEP(1); STEP(2); STEP(3);
NEXTI;
STEP(0); STEP(1); STEP(2); STEP(3); STEP(4);
NEXTI;
STEP(0); STEP(1); STEP(2); STEP(3); STEP(4); STEP(5);
NEXTI;
STEP(0); STEP(1); STEP(2); STEP(3); STEP(4); STEP(5); STEP(6);
NEXTI;
STEP(0); STEP(1); STEP(2); STEP(3); STEP(4); STEP(5); STEP(6); STEP(7);
for (i = 8; i <= 159; i++) {
NEXTI;
STEP(0);
STEP(1); STEP(2); STEP(3); STEP(4);
STEP(5); STEP(6); STEP(7); STEP(8);
}
for (k = 9; k--; L_ACF[k] <<= 1) ;
}
/* Rescaling of the array s[0..159]
*/
if (scalauto > 0) {
assert(scalauto <= 4);
for (k = 160; k--; *s++ <<= scalauto) ;
}
}
#if defined(USE_FLOAT_MUL) && defined(FAST)
static void Fast_Autocorrelation P2((s, L_ACF),
word * s, /* [0..159] IN/OUT */
longword * L_ACF) /* [0..8] OUT */
{
register int k, i;
float f_L_ACF[9];
float scale;
float s_f[160];
register float *sf = s_f;
for (i = 0; i < 160; ++i) sf[i] = s[i];
for (k = 0; k <= 8; k++) {
register float L_temp2 = 0;
register float *sfl = sf - k;
for (i = k; i < 160; ++i) L_temp2 += sf[i] * sfl[i];
f_L_ACF[k] = L_temp2;
}
scale = MAX_LONGWORD / f_L_ACF[0];
for (k = 0; k <= 8; k++) {
L_ACF[k] = f_L_ACF[k] * scale;
}
}
#endif /* defined (USE_FLOAT_MUL) && defined (FAST) */
/* 4.2.5 */
static void Reflection_coefficients P2( (L_ACF, r),
longword * L_ACF, /* 0...8 IN */
register word * r /* 0...7 OUT */
)
{
register int i, m, n;
register word temp;
register longword ltmp;
word ACF[9]; /* 0..8 */
word P[ 9]; /* 0..8 */
word K[ 9]; /* 2..8 */
/* Schur recursion with 16 bits arithmetic.
*/
if (L_ACF[0] == 0) {
for (i = 8; i--; *r++ = 0) ;
return;
}
assert( L_ACF[0] != 0 );
temp = gsm_norm( L_ACF[0] );
assert(temp >= 0 && temp < 32);
/* ? overflow ? */
for (i = 0; i <= 8; i++) ACF[i] = SASR( L_ACF[i] << temp, 16 );
/* Initialize array P[..] and K[..] for the recursion.
*/
for (i = 1; i <= 7; i++) K[ i ] = ACF[ i ];
for (i = 0; i <= 8; i++) P[ i ] = ACF[ i ];
/* Compute reflection coefficients
*/
for (n = 1; n <= 8; n++, r++) {
temp = P[1];
temp = GSM_ABS(temp);
if (P[0] < temp) {
for (i = n; i <= 8; i++) *r++ = 0;
return;
}
*r = gsm_div( temp, P[0] );
assert(*r >= 0);
if (P[1] > 0) *r = -*r; /* r[n] = sub(0, r[n]) */
assert (*r != MIN_WORD);
if (n == 8) return;
/* Schur recursion
*/
temp = GSM_MULT_R( P[1], *r );
P[0] = GSM_ADD( P[0], temp );
for (m = 1; m <= 8 - n; m++) {
temp = GSM_MULT_R( K[ m ], *r );
P[m] = GSM_ADD( P[ m+1 ], temp );
temp = GSM_MULT_R( P[ m+1 ], *r );
K[m] = GSM_ADD( K[ m ], temp );
}
}
}
/* 4.2.6 */
static void Transformation_to_Log_Area_Ratios P1((r),
register word * r /* 0..7 IN/OUT */
)
/*
* The following scaling for r[..] and LAR[..] has been used:
*
* r[..] = integer( real_r[..]*32768. ); -1 <= real_r < 1.
* LAR[..] = integer( real_LAR[..] * 16384 );
* with -1.625 <= real_LAR <= 1.625
*/
{
register word temp;
register int i;
/* Computation of the LAR[0..7] from the r[0..7]
*/
for (i = 1; i <= 8; i++, r++) {
temp = *r;
temp = GSM_ABS(temp);
assert(temp >= 0);
if (temp < 22118) {
temp >>= 1;
} else if (temp < 31130) {
assert( temp >= 11059 );
temp -= 11059;
} else {
assert( temp >= 26112 );
temp -= 26112;
temp <<= 2;
}
*r = *r < 0 ? -temp : temp;
assert( *r != MIN_WORD );
}
}
/* 4.2.7 */
static void Quantization_and_coding P1((LAR),
register word * LAR /* [0..7] IN/OUT */
)
{
register word temp;
longword ltmp;
/* This procedure needs four tables; the following equations
* give the optimum scaling for the constants:
*
* A[0..7] = integer( real_A[0..7] * 1024 )
* B[0..7] = integer( real_B[0..7] * 512 )
* MAC[0..7] = maximum of the LARc[0..7]
* MIC[0..7] = minimum of the LARc[0..7]
*/
# undef STEP
# define STEP( A, B, MAC, MIC ) \
temp = GSM_MULT( A, *LAR ); \
temp = GSM_ADD( temp, B ); \
temp = GSM_ADD( temp, 256 ); \
temp = SASR( temp, 9 ); \
*LAR = temp>MAC ? MAC - MIC : (temp<MIC ? 0 : temp - MIC); \
LAR++;
STEP( 20480, 0, 31, -32 );
STEP( 20480, 0, 31, -32 );
STEP( 20480, 2048, 15, -16 );
STEP( 20480, -2560, 15, -16 );
STEP( 13964, 94, 7, -8 );
STEP( 15360, -1792, 7, -8 );
STEP( 8534, -341, 3, -4 );
STEP( 9036, -1144, 3, -4 );
# undef STEP
}
void Gsm_LPC_Analysis P3((S, s,LARc),
struct gsm_state *S,
word * s, /* 0..159 signals IN/OUT */
word * LARc) /* 0..7 LARc's OUT */
{
longword L_ACF[9];
#if defined(USE_FLOAT_MUL) && defined(FAST)
if (S->fast) Fast_Autocorrelation (s, L_ACF );
else
#endif
Autocorrelation (s, L_ACF );
Reflection_coefficients (L_ACF, LARc );
Transformation_to_Log_Area_Ratios (LARc);
Quantization_and_coding (LARc);
}
/****** begin "preprocess.c" *****/
/* 4.2.0 .. 4.2.3 PREPROCESSING SECTION
*
* After A-law to linear conversion (or directly from the
* Ato D converter) the following scaling is assumed for
* input to the RPE-LTP algorithm:
*
* in: 0.1.....................12
* S.v.v.v.v.v.v.v.v.v.v.v.v.*.*.*
*
* Where S is the sign bit, v a valid bit, and * a "don't care" bit.
* The original signal is called sop[..]
*
* out: 0.1................... 12
* S.S.v.v.v.v.v.v.v.v.v.v.v.v.0.0
*/
void Gsm_Preprocess P3((S, s, so),
struct gsm_state * S,
word * s,
word * so ) /* [0..159] IN/OUT */
{
word z1 = S->z1;
longword L_z2 = S->L_z2;
word mp = S->mp;
word s1;
longword L_s2;
longword L_temp;
word msp, lsp;
word SO;
longword ltmp; /* for ADD */
ulongword utmp; /* for L_ADD */
volatile int k = 160;
while (k--) {
/* 4.2.1 Downscaling of the input signal
*/
SO = SASR( *s, 3 ) << 2;
s++;
assert (SO >= -0x4000); /* downscaled by */
assert (SO <= 0x3FFC); /* previous routine. */
/* 4.2.2 Offset compensation
*
* This part implements a high-pass filter and requires extended
* arithmetic precision for the recursive part of this filter.
* The input of this procedure is the array so[0...159] and the
* output the array sof[ 0...159 ].
*/
/* Compute the non-recursive part
*/
s1 = SO - z1; /* s1 = gsm_sub( *so, z1 ); */
z1 = SO;
assert(s1 != MIN_WORD);
/* Compute the recursive part
*/
L_s2 = s1;
L_s2 <<= 15;
/* Execution of a 31 bv 16 bits multiplication
*/
msp = SASR( L_z2, 15 );
lsp = L_z2-((longword)msp<<15); /* gsm_L_sub(L_z2,(msp<<15)); */
L_s2 += GSM_MULT_R( lsp, 32735 );
L_temp = (longword)msp * 32735; /* GSM_L_MULT(msp,32735) >> 1;*/
L_z2 = GSM_L_ADD( L_temp, L_s2 );
/* Compute sof[k] with rounding
*/
L_temp = GSM_L_ADD( L_z2, 16384 );
/* 4.2.3 Preemphasis
*/
msp = GSM_MULT_R( mp, -28180 );
mp = SASR( L_temp, 15 );
*so++ = GSM_ADD( mp, msp );
}
S->z1 = z1;
S->L_z2 = L_z2;
S->mp = mp;
}
/****** begin "rpe.c" *****/
/* 4.2.13 .. 4.2.17 RPE ENCODING SECTION
*/
/* 4.2.13 */
static void Weighting_filter P2((e, x),
register word * e, /* signal [-5..0.39.44] IN */
word * x /* signal [0..39] OUT */
)
/*
* The coefficients of the weighting filter are stored in a table
* (see table 4.4). The following scaling is used:
*
* H[0..10] = integer( real_H[ 0..10] * 8192 );
*/
{
/* word wt[ 50 ]; */
register longword L_result;
register int k /* , i */ ;
/* Initialization of a temporary working array wt[0...49]
*/
/* for (k = 0; k <= 4; k++) wt[k] = 0;
* for (k = 5; k <= 44; k++) wt[k] = *e++;
* for (k = 45; k <= 49; k++) wt[k] = 0;
*
* (e[-5..-1] and e[40..44] are allocated by the caller,
* are initially zero and are not written anywhere.)
*/
e -= 5;
/* Compute the signal x[0..39]
*/
for (k = 0; k <= 39; k++) {
L_result = 8192 >> 1;
/* for (i = 0; i <= 10; i++) {
* L_temp = GSM_L_MULT( wt[k+i], gsm_H[i] );
* L_result = GSM_L_ADD( L_result, L_temp );
* }
*/
#undef STEP
#define STEP( i, H ) (e[ k + i ] * (longword)H)
/* Every one of these multiplications is done twice --
* but I don't see an elegant way to optimize this.
* Do you?
*/
#ifdef STUPID_COMPILER
L_result += STEP( 0, -134 ) ;
L_result += STEP( 1, -374 ) ;
/* + STEP( 2, 0 ) */
L_result += STEP( 3, 2054 ) ;
L_result += STEP( 4, 5741 ) ;
L_result += STEP( 5, 8192 ) ;
L_result += STEP( 6, 5741 ) ;
L_result += STEP( 7, 2054 ) ;
/* + STEP( 8, 0 ) */
L_result += STEP( 9, -374 ) ;
L_result += STEP( 10, -134 ) ;
#else
L_result +=
STEP( 0, -134 )
+ STEP( 1, -374 )
/* + STEP( 2, 0 ) */
+ STEP( 3, 2054 )
+ STEP( 4, 5741 )
+ STEP( 5, 8192 )
+ STEP( 6, 5741 )
+ STEP( 7, 2054 )
/* + STEP( 8, 0 ) */
+ STEP( 9, -374 )
+ STEP(10, -134 )
;
#endif
/* L_result = GSM_L_ADD( L_result, L_result ); (* scaling(x2) *)
* L_result = GSM_L_ADD( L_result, L_result ); (* scaling(x4) *)
*
* x[k] = SASR( L_result, 16 );
*/
/* 2 adds vs. >>16 => 14, minus one shift to compensate for
* those we lost when replacing L_MULT by '*'.
*/
L_result = SASR( L_result, 13 );
x[k] = ( L_result < MIN_WORD ? MIN_WORD
: (L_result > MAX_WORD ? MAX_WORD : L_result ));
}
}
/* 4.2.14 */
static void RPE_grid_selection P3((x,xM,Mc_out),
word * x, /* [0..39] IN */
word * xM, /* [0..12] OUT */
word * Mc_out /* OUT */
)
/*
* The signal x[0..39] is used to select the RPE grid which is
* represented by Mc.
*/
{
/* register word temp1; */
register int /* m, */ i;
register longword L_result, L_temp;
longword EM; /* xxx should be L_EM? */
word Mc;
longword L_common_0_3;
EM = 0;
Mc = 0;
/* for (m = 0; m <= 3; m++) {
* L_result = 0;
*
*
* for (i = 0; i <= 12; i++) {
*
* temp1 = SASR( x[m + 3*i], 2 );
*
* assert(temp1 != MIN_WORD);
*
* L_temp = GSM_L_MULT( temp1, temp1 );
* L_result = GSM_L_ADD( L_temp, L_result );
* }
*
* if (L_result > EM) {
* Mc = m;
* EM = L_result;
* }
* }
*/
#undef STEP
#define STEP( m, i ) L_temp = SASR( x[m + 3 * i], 2 ); \
L_result += L_temp * L_temp;
/* common part of 0 and 3 */
L_result = 0;
STEP( 0, 1 ); STEP( 0, 2 ); STEP( 0, 3 ); STEP( 0, 4 );
STEP( 0, 5 ); STEP( 0, 6 ); STEP( 0, 7 ); STEP( 0, 8 );
STEP( 0, 9 ); STEP( 0, 10); STEP( 0, 11); STEP( 0, 12);
L_common_0_3 = L_result;
/* i = 0 */
STEP( 0, 0 );
L_result <<= 1; /* implicit in L_MULT */
EM = L_result;
/* i = 1 */
L_result = 0;
STEP( 1, 0 );
STEP( 1, 1 ); STEP( 1, 2 ); STEP( 1, 3 ); STEP( 1, 4 );
STEP( 1, 5 ); STEP( 1, 6 ); STEP( 1, 7 ); STEP( 1, 8 );
STEP( 1, 9 ); STEP( 1, 10); STEP( 1, 11); STEP( 1, 12);
L_result <<= 1;
if (L_result > EM) {
Mc = 1;
EM = L_result;
}
/* i = 2 */
L_result = 0;
STEP( 2, 0 );
STEP( 2, 1 ); STEP( 2, 2 ); STEP( 2, 3 ); STEP( 2, 4 );
STEP( 2, 5 ); STEP( 2, 6 ); STEP( 2, 7 ); STEP( 2, 8 );
STEP( 2, 9 ); STEP( 2, 10); STEP( 2, 11); STEP( 2, 12);
L_result <<= 1;
if (L_result > EM) {
Mc = 2;
EM = L_result;
}
/* i = 3 */
L_result = L_common_0_3;
STEP( 3, 12 );
L_result <<= 1;
if (L_result > EM) {
Mc = 3;
EM = L_result;
}
/**/
/* Down-sampling by a factor 3 to get the selected xM[0..12]
* RPE sequence.
*/
for (i = 0; i <= 12; i ++) xM[i] = x[Mc + 3*i];
*Mc_out = Mc;
}
/* 4.12.15 */
static void APCM_quantization_xmaxc_to_exp_mant P3((xmaxc,exp_out,mant_out),
word xmaxc, /* IN */
word * exp_out, /* OUT */
word * mant_out ) /* OUT */
{
word exp, mant;
/* Compute exponent and mantissa of the decoded version of xmaxc
*/
exp = 0;
if (xmaxc > 15) exp = SASR(xmaxc, 3) - 1;
mant = xmaxc - (exp << 3);
if (mant == 0) {
exp = -4;
mant = 7;
}
else {
while (mant <= 7) {
mant = mant << 1 | 1;
exp--;
}
mant -= 8;
}
assert( exp >= -4 && exp <= 6 );
assert( mant >= 0 && mant <= 7 );
*exp_out = exp;
*mant_out = mant;
}
static void APCM_quantization P5((xM,xMc,mant_out,exp_out,xmaxc_out),
word * xM, /* [0..12] IN */
word * xMc, /* [0..12] OUT */
word * mant_out, /* OUT */
word * exp_out, /* OUT */
word * xmaxc_out /* OUT */
)
{
int i, itest;
word xmax, xmaxc, temp, temp1, temp2;
word exp, mant;
/* Find the maximum absolute value xmax of xM[0..12].
*/
xmax = 0;
for (i = 0; i <= 12; i++) {
temp = xM[i];
temp = GSM_ABS(temp);
if (temp > xmax) xmax = temp;
}
/* Qantizing and coding of xmax to get xmaxc.
*/
exp = 0;
temp = SASR( xmax, 9 );
itest = 0;
for (i = 0; i <= 5; i++) {
itest |= (temp <= 0);
temp = SASR( temp, 1 );
assert(exp <= 5);
if (itest == 0) exp++; /* exp = add (exp, 1) */
}
assert(exp <= 6 && exp >= 0);
temp = exp + 5;
assert(temp <= 11 && temp >= 0);
xmaxc = gsm_add( SASR(xmax, temp), exp << 3 );
/* Quantizing and coding of the xM[0..12] RPE sequence
* to get the xMc[0..12]
*/
APCM_quantization_xmaxc_to_exp_mant( xmaxc, &exp, &mant );
/* This computation uses the fact that the decoded version of xmaxc
* can be calculated by using the exponent and the mantissa part of
* xmaxc (logarithmic table).
* So, this method avoids any division and uses only a scaling
* of the RPE samples by a function of the exponent. A direct
* multiplication by the inverse of the mantissa (NRFAC[0..7]
* found in table 4.5) gives the 3 bit coded version xMc[0..12]
* of the RPE samples.
*/
/* Direct computation of xMc[0..12] using table 4.5
*/
assert( exp <= 4096 && exp >= -4096);
assert( mant >= 0 && mant <= 7 );
temp1 = 6 - exp; /* normalization by the exponent */
temp2 = gsm_NRFAC[ mant ]; /* inverse mantissa */
for (i = 0; i <= 12; i++) {
assert(temp1 >= 0 && temp1 < 16);
temp = xM[i] << temp1;
temp = GSM_MULT( temp, temp2 );
temp = SASR(temp, 12);
xMc[i] = temp + 4; /* see note below */
}
/* NOTE: This equation is used to make all the xMc[i] positive.
*/
*mant_out = mant;
*exp_out = exp;
*xmaxc_out = xmaxc;
}
/* 4.2.16 */
static void APCM_inverse_quantization P4((xMc,mant,exp,xMp),
register word * xMc, /* [0..12] IN */
word mant,
word exp,
register word * xMp) /* [0..12] OUT */
/*
* This part is for decoding the RPE sequence of coded xMc[0..12]
* samples to obtain the xMp[0..12] array. Table 4.6 is used to get
* the mantissa of xmaxc (FAC[0..7]).
*/
{
int i;
word temp, temp1, temp2, temp3;
longword ltmp;
assert( mant >= 0 && mant <= 7 );
temp1 = gsm_FAC[ mant ]; /* see 4.2-15 for mant */
temp2 = gsm_sub( 6, exp ); /* see 4.2-15 for exp */
temp3 = gsm_asl( 1, gsm_sub( temp2, 1 ));
for (i = 13; i--;) {
assert( *xMc <= 7 && *xMc >= 0 ); /* 3 bit unsigned */
/* temp = gsm_sub( *xMc++ << 1, 7 ); */
temp = (*xMc++ << 1) - 7; /* restore sign */
assert( temp <= 7 && temp >= -7 ); /* 4 bit signed */
temp <<= 12; /* 16 bit signed */
temp = GSM_MULT_R( temp1, temp );
temp = GSM_ADD( temp, temp3 );
*xMp++ = gsm_asr( temp, temp2 );
}
}
/* 4.2.17 */
static void RPE_grid_positioning P3((Mc,xMp,ep),
word Mc, /* grid position IN */
register word * xMp, /* [0..12] IN */
register word * ep /* [0..39] OUT */
)
/*
* This procedure computes the reconstructed long term residual signal
* ep[0..39] for the LTP analysis filter. The inputs are the Mc
* which is the grid position selection and the xMp[0..12] decoded
* RPE samples which are upsampled by a factor of 3 by inserting zero
* values.
*/
{
volatile int i = 13;
assert(0 <= Mc && Mc <= 3);
switch (Mc) {
case 3: *ep++ = 0;
case 2: do {
*ep++ = 0;
case 1: *ep++ = 0;
case 0: *ep++ = *xMp++;
} while (--i);
}
while (++Mc < 4) *ep++ = 0;
/*
int i, k;
for (k = 0; k <= 39; k++) ep[k] = 0;
for (i = 0; i <= 12; i++) {
ep[ Mc + (3*i) ] = xMp[i];
}
*/
}
/* 4.2.18 */
/* This procedure adds the reconstructed long term residual signal
* ep[0..39] to the estimated signal dpp[0..39] from the long term
* analysis filter to compute the reconstructed short term residual
* signal dp[-40..-1]; also the reconstructed short term residual
* array dp[-120..-41] is updated.
*/
#if 0 /* Has been inlined in code.c */
void Gsm_Update_of_reconstructed_short_time_residual_signal P3((dpp, ep, dp),
word * dpp, /* [0...39] IN */
word * ep, /* [0...39] IN */
word * dp) /* [-120...-1] IN/OUT */
{
int k;
for (k = 0; k <= 79; k++)
dp[ -120 + k ] = dp[ -80 + k ];
for (k = 0; k <= 39; k++)
dp[ -40 + k ] = gsm_add( ep[k], dpp[k] );
}
#endif /* Has been inlined in code.c */
void Gsm_RPE_Encoding P5((S,e,xmaxc,Mc,xMc),
struct gsm_state * S,
word * e, /* -5..-1][0..39][40..44 IN/OUT */
word * xmaxc, /* OUT */
word * Mc, /* OUT */
word * xMc) /* [0..12] OUT */
{
word x[40];
word xM[13], xMp[13];
word mant, exp;
Weighting_filter(e, x);
RPE_grid_selection(x, xM, Mc);
APCM_quantization( xM, xMc, &mant, &exp, xmaxc);
APCM_inverse_quantization( xMc, mant, exp, xMp);
RPE_grid_positioning( *Mc, xMp, e );
}
void Gsm_RPE_Decoding P5((S, xmaxcr, Mcr, xMcr, erp),
struct gsm_state * S,
word xmaxcr,
word Mcr,
word * xMcr, /* [0..12], 3 bits IN */
word * erp /* [0..39] OUT */
)
{
word exp, mant;
word xMp[ 13 ];
APCM_quantization_xmaxc_to_exp_mant( xmaxcr, &exp, &mant );
APCM_inverse_quantization( xMcr, mant, exp, xMp );
RPE_grid_positioning( Mcr, xMp, erp );
}
/****** begin "short_term.c" *****/
/*
* SHORT TERM ANALYSIS FILTERING SECTION
*/
/* 4.2.8 */
static void Decoding_of_the_coded_Log_Area_Ratios P2((LARc,LARpp),
word * LARc, /* coded log area ratio [0..7] IN */
word * LARpp) /* out: decoded .. */
{
register word temp1 /* , temp2 */;
register long ltmp; /* for GSM_ADD */
/* This procedure requires for efficient implementation
* two tables.
*
* INVA[1..8] = integer( (32768 * 8) / real_A[1..8])
* MIC[1..8] = minimum value of the LARc[1..8]
*/
/* Compute the LARpp[1..8]
*/
/* for (i = 1; i <= 8; i++, B++, MIC++, INVA++, LARc++, LARpp++) {
*
* temp1 = GSM_ADD( *LARc, *MIC ) << 10;
* temp2 = *B << 1;
* temp1 = GSM_SUB( temp1, temp2 );
*
* assert(*INVA != MIN_WORD);
*
* temp1 = GSM_MULT_R( *INVA, temp1 );
* *LARpp = GSM_ADD( temp1, temp1 );
* }
*/
#undef STEP
#define STEP( B, MIC, INVA ) \
temp1 = GSM_ADD( *LARc++, MIC ) << 10; \
temp1 = GSM_SUB( temp1, B << 1 ); \
temp1 = GSM_MULT_R( INVA, temp1 ); \
*LARpp++ = GSM_ADD( temp1, temp1 );
STEP( 0, -32, 13107 );
STEP( 0, -32, 13107 );
STEP( 2048, -16, 13107 );
STEP( -2560, -16, 13107 );
STEP( 94, -8, 19223 );
STEP( -1792, -8, 17476 );
STEP( -341, -4, 31454 );
STEP( -1144, -4, 29708 );
/* NOTE: the addition of *MIC is used to restore
* the sign of *LARc.
*/
}
/* 4.2.9 */
/* Computation of the quantized reflection coefficients
*/
/* 4.2.9.1 Interpolation of the LARpp[1..8] to get the LARp[1..8]
*/
/*
* Within each frame of 160 analyzed speech samples the short term
* analysis and synthesis filters operate with four different sets of
* coefficients, derived from the previous set of decoded LARs(LARpp(j-1))
* and the actual set of decoded LARs (LARpp(j))
*
* (Initial value: LARpp(j-1)[1..8] = 0.)
*/
static void Coefficients_0_12 P3((LARpp_j_1, LARpp_j, LARp),
register word * LARpp_j_1,
register word * LARpp_j,
register word * LARp)
{
register int i;
register longword ltmp;
for (i = 1; i <= 8; i++, LARp++, LARpp_j_1++, LARpp_j++) {
*LARp = GSM_ADD( SASR( *LARpp_j_1, 2 ), SASR( *LARpp_j, 2 ));
*LARp = GSM_ADD( *LARp, SASR( *LARpp_j_1, 1));
}
}
static void Coefficients_13_26 P3((LARpp_j_1, LARpp_j, LARp),
register word * LARpp_j_1,
register word * LARpp_j,
register word * LARp)
{
register int i;
register longword ltmp;
for (i = 1; i <= 8; i++, LARpp_j_1++, LARpp_j++, LARp++) {
*LARp = GSM_ADD( SASR( *LARpp_j_1, 1), SASR( *LARpp_j, 1 ));
}
}
static void Coefficients_27_39 P3((LARpp_j_1, LARpp_j, LARp),
register word * LARpp_j_1,
register word * LARpp_j,
register word * LARp)
{
register int i;
register longword ltmp;
for (i = 1; i <= 8; i++, LARpp_j_1++, LARpp_j++, LARp++) {
*LARp = GSM_ADD( SASR( *LARpp_j_1, 2 ), SASR( *LARpp_j, 2 ));
*LARp = GSM_ADD( *LARp, SASR( *LARpp_j, 1 ));
}
}
static void Coefficients_40_159 P2((LARpp_j, LARp),
register word * LARpp_j,
register word * LARp)
{
register int i;
for (i = 1; i <= 8; i++, LARp++, LARpp_j++)
*LARp = *LARpp_j;
}
/* 4.2.9.2 */
static void LARp_to_rp P1((LARp),
register word * LARp) /* [0..7] IN/OUT */
/*
* The input of this procedure is the interpolated LARp[0..7] array.
* The reflection coefficients, rp[i], are used in the analysis
* filter and in the synthesis filter.
*/
{
register int i;
register word temp;
register longword ltmp;
for (i = 1; i <= 8; i++, LARp++) {
/* temp = GSM_ABS( *LARp );
*
* if (temp < 11059) temp <<= 1;
* else if (temp < 20070) temp += 11059;
* else temp = GSM_ADD( temp >> 2, 26112 );
*
* *LARp = *LARp < 0 ? -temp : temp;
*/
if (*LARp < 0) {
temp = *LARp == MIN_WORD ? MAX_WORD : -(*LARp);
*LARp = - ((temp < 11059) ? temp << 1
: ((temp < 20070) ? temp + 11059
: GSM_ADD( temp >> 2, 26112 )));
} else {
temp = *LARp;
*LARp = (temp < 11059) ? temp << 1
: ((temp < 20070) ? temp + 11059
: GSM_ADD( temp >> 2, 26112 ));
}
}
}
/* 4.2.10 */
static void Short_term_analysis_filtering P4((S,rp,k_n,s),
struct gsm_state * S,
register word * rp, /* [0..7] IN */
register int k_n, /* k_end - k_start */
register word * s /* [0..n-1] IN/OUT */
)
/*
* This procedure computes the short term residual signal d[..] to be fed
* to the RPE-LTP loop from the s[..] signal and from the local rp[..]
* array (quantized reflection coefficients). As the call of this
* procedure can be done in many ways (see the interpolation of the LAR
* coefficient), it is assumed that the computation begins with index
* k_start (for arrays d[..] and s[..]) and stops with index k_end
* (k_start and k_end are defined in 4.2.9.1). This procedure also
* needs to keep the array u[0..7] in memory for each call.
*/
{
register word * u = S->u;
register int i;
register word di, zzz, ui, sav, rpi;
register longword ltmp;
for (; k_n--; s++) {
di = sav = *s;
for (i = 0; i < 8; i++) { /* YYY */
ui = u[i];
rpi = rp[i];
u[i] = sav;
zzz = GSM_MULT_R(rpi, di);
sav = GSM_ADD( ui, zzz);
zzz = GSM_MULT_R(rpi, ui);
di = GSM_ADD( di, zzz );
}
*s = di;
}
}
#if defined(USE_FLOAT_MUL) && defined(FAST)
static void Fast_Short_term_analysis_filtering P4((S,rp,k_n,s),
struct gsm_state * S,
register word * rp, /* [0..7] IN */
register int k_n, /* k_end - k_start */
register word * s /* [0..n-1] IN/OUT */
)
{
register word * u = S->u;
register int i;
float uf[8],
rpf[8];
register float scalef = 3.0517578125e-5;
register float sav, di, temp;
for (i = 0; i < 8; ++i) {
uf[i] = u[i];
rpf[i] = rp[i] * scalef;
}
for (; k_n--; s++) {
sav = di = *s;
for (i = 0; i < 8; ++i) {
register float rpfi = rpf[i];
register float ufi = uf[i];
uf[i] = sav;
temp = rpfi * di + ufi;
di += rpfi * ufi;
sav = temp;
}
*s = di;
}
for (i = 0; i < 8; ++i) u[i] = uf[i];
}
#endif /* ! (defined (USE_FLOAT_MUL) && defined (FAST)) */
static void Short_term_synthesis_filtering P5((S,rrp,k,wt,sr),
struct gsm_state * S,
register word * rrp, /* [0..7] IN */
register int k, /* k_end - k_start */
register word * wt, /* [0..k-1] IN */
register word * sr /* [0..k-1] OUT */
)
{
register word * v = S->v;
register int i;
register word sri, tmp1, tmp2;
register longword ltmp; /* for GSM_ADD & GSM_SUB */
while (k--) {
sri = *wt++;
for (i = 8; i--;) {
/* sri = GSM_SUB( sri, gsm_mult_r( rrp[i], v[i] ) );
*/
tmp1 = rrp[i];
tmp2 = v[i];
tmp2 = ( tmp1 == MIN_WORD && tmp2 == MIN_WORD
? MAX_WORD
: 0x0FFFF & (( (longword)tmp1 * (longword)tmp2
+ 16384) >> 15)) ;
sri = GSM_SUB( sri, tmp2 );
/* v[i+1] = GSM_ADD( v[i], gsm_mult_r( rrp[i], sri ) );
*/
tmp1 = ( tmp1 == MIN_WORD && sri == MIN_WORD
? MAX_WORD
: 0x0FFFF & (( (longword)tmp1 * (longword)sri
+ 16384) >> 15)) ;
v[i+1] = GSM_ADD( v[i], tmp1);
}
*sr++ = v[0] = sri;
}
}
#if defined(FAST) && defined(USE_FLOAT_MUL)
static void Fast_Short_term_synthesis_filtering P5((S,rrp,k,wt,sr),
struct gsm_state * S,
register word * rrp, /* [0..7] IN */
register int k, /* k_end - k_start */
register word * wt, /* [0..k-1] IN */
register word * sr /* [0..k-1] OUT */
)
{
register word * v = S->v;
register int i;
float va[9], rrpa[8];
register float scalef = 3.0517578125e-5, temp;
for (i = 0; i < 8; ++i) {
va[i] = v[i];
rrpa[i] = (float)rrp[i] * scalef;
}
while (k--) {
register float sri = *wt++;
for (i = 8; i--;) {
sri -= rrpa[i] * va[i];
if (sri < -32768.) sri = -32768.;
else if (sri > 32767.) sri = 32767.;
temp = va[i] + rrpa[i] * sri;
if (temp < -32768.) temp = -32768.;
else if (temp > 32767.) temp = 32767.;
va[i+1] = temp;
}
*sr++ = va[0] = sri;
}
for (i = 0; i < 9; ++i) v[i] = va[i];
}
#endif /* defined(FAST) && defined(USE_FLOAT_MUL) */
void Gsm_Short_Term_Analysis_Filter P3((S,LARc,s),
struct gsm_state * S,
word * LARc, /* coded log area ratio [0..7] IN */
word * s /* signal [0..159] IN/OUT */
)
{
word * LARpp_j = S->LARpp[ S->j ];
word * LARpp_j_1 = S->LARpp[ S->j ^= 1 ];
word LARp[8];
#undef FILTER
#if defined(FAST) && defined(USE_FLOAT_MUL)
# define FILTER (* (S->fast \
? Fast_Short_term_analysis_filtering \
: Short_term_analysis_filtering ))
#else
# define FILTER Short_term_analysis_filtering
#endif
Decoding_of_the_coded_Log_Area_Ratios( LARc, LARpp_j );
Coefficients_0_12( LARpp_j_1, LARpp_j, LARp );
LARp_to_rp( LARp );
FILTER( S, LARp, 13, s);
Coefficients_13_26( LARpp_j_1, LARpp_j, LARp);
LARp_to_rp( LARp );
FILTER( S, LARp, 14, s + 13);
Coefficients_27_39( LARpp_j_1, LARpp_j, LARp);
LARp_to_rp( LARp );
FILTER( S, LARp, 13, s + 27);
Coefficients_40_159( LARpp_j, LARp);
LARp_to_rp( LARp );
FILTER( S, LARp, 120, s + 40);
}
void Gsm_Short_Term_Synthesis_Filter P4((S, LARcr, wt, s),
struct gsm_state * S,
word * LARcr, /* received log area ratios [0..7] IN */
word * wt, /* received d [0..159] IN */
word * s /* signal s [0..159] OUT */
)
{
word * LARpp_j = S->LARpp[ S->j ];
word * LARpp_j_1 = S->LARpp[ S->j ^=1 ];
word LARp[8];
#undef FILTER
#if defined(FAST) && defined(USE_FLOAT_MUL)
# define FILTER (* (S->fast \
? Fast_Short_term_synthesis_filtering \
: Short_term_synthesis_filtering ))
#else
# define FILTER Short_term_synthesis_filtering
#endif
Decoding_of_the_coded_Log_Area_Ratios( LARcr, LARpp_j );
Coefficients_0_12( LARpp_j_1, LARpp_j, LARp );
LARp_to_rp( LARp );
FILTER( S, LARp, 13, wt, s );
Coefficients_13_26( LARpp_j_1, LARpp_j, LARp);
LARp_to_rp( LARp );
FILTER( S, LARp, 14, wt + 13, s + 13 );
Coefficients_27_39( LARpp_j_1, LARpp_j, LARp);
LARp_to_rp( LARp );
FILTER( S, LARp, 13, wt + 27, s + 27 );
Coefficients_40_159( LARpp_j, LARp );
LARp_to_rp( LARp );
FILTER(S, LARp, 120, wt + 40, s + 40);
}
/****** begin "table.c" *****/
/* Most of these tables are inlined at their point of use.
*/
/* 4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP
* CODER AND DECODER
*
* (Most of them inlined, so watch out.)
*/
/* Table 4.1 Quantization of the Log.-Area Ratios
*/
/* i 1 2 3 4 5 6 7 8 */
word gsm_A[8] = {20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036};
word gsm_B[8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144};
word gsm_MIC[8] = { -32, -32, -16, -16, -8, -8, -4, -4 };
word gsm_MAC[8] = { 31, 31, 15, 15, 7, 7, 3, 3 };
/* Table 4.2 Tabulation of 1/A[1..8]
*/
word gsm_INVA[8]={ 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 };
/* Table 4.3a Decision level of the LTP gain quantizer
*/
/* bc 0 1 2 3 */
word gsm_DLB[4] = { 6554, 16384, 26214, 32767 };
/* Table 4.3b Quantization levels of the LTP gain quantizer
*/
/* bc 0 1 2 3 */
word gsm_QLB[4] = { 3277, 11469, 21299, 32767 };
/* Table 4.4 Coefficients of the weighting filter
*/
/* i 0 1 2 3 4 5 6 7 8 9 10 */
word gsm_H[11] = {-134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 };
/* Table 4.5 Normalized inverse mantissa used to compute xM/xmax
*/
/* i 0 1 2 3 4 5 6 7 */
word gsm_NRFAC[8] = { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 };
/* Table 4.6 Normalized direct mantissa used to compute xM/xmax
*/
/* i 0 1 2 3 4 5 6 7 */
word gsm_FAC[8] = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 };
/***** Squeak Interface Code Starts Here *****/
/* prototypes */
void gsmEncode(
int state, int frameCount,
int src, int srcIndex, int srcSize,
int dst, int dstIndex, int dstSize,
int *srcDelta, int *dstDelta);
void gsmDecode(
int state, int frameCount,
int src, int srcIndex, int srcSize,
int dst, int dstIndex, int dstSize,
int *srcDelta, int *dstDelta);
void gsmInitState(int state);
int gsmStateBytes(void);
/* glue functions */
void gsmEncode(
int state, int frameCount,
int src, int srcIndex, int srcSize,
int dst, int dstIndex, int dstSize,
int *srcDelta, int *dstDelta) {
int maxSrcFrames, maxDstFrames, srcPtr, dstPtr, i;
maxSrcFrames = (srcSize + 1 - srcIndex) / 160;
maxDstFrames = (dstSize + 1 - dstIndex) / 33;
if (frameCount > maxSrcFrames) frameCount = maxSrcFrames;
if (frameCount > maxDstFrames) frameCount = maxDstFrames;
srcPtr = src + 4 + ((srcIndex - 1) * 2);
dstPtr = dst + 4 + (dstIndex - 1);
for (i = 1; i <= frameCount; i++) {
gsm_encode((gsm) state, (short *) srcPtr, (unsigned char *) dstPtr);
srcPtr += 160 * 2;
dstPtr += 33;
}
*srcDelta = frameCount * 160;
*dstDelta = frameCount * 33;
}
void gsmDecode(
int state, int frameCount,
int src, int srcIndex, int srcSize,
int dst, int dstIndex, int dstSize,
int *srcDelta, int *dstDelta) {
int maxSrcFrames, maxDstFrames, srcPtr, dstPtr, i;
maxSrcFrames = (srcSize + 1 - srcIndex) / 33;
maxDstFrames = (dstSize + 1 - dstIndex) / 160;
if (frameCount > maxSrcFrames) frameCount = maxSrcFrames;
if (frameCount > maxDstFrames) frameCount = maxDstFrames;
srcPtr = src + 4 + (srcIndex - 1);
dstPtr = dst + 4 + ((dstIndex - 1) * 2);
for (i = 1; i <= frameCount; i++) {
gsm_decode((gsm) state, (unsigned char *) srcPtr, (short *) dstPtr);
srcPtr += 33;
dstPtr += 160 * 2;
}
*srcDelta = frameCount * 33;
*dstDelta = frameCount * 160;
}
void gsmInitState(int state) {
/* Initialize the given GSM state record. */
memset((char *) state, 0, sizeof(struct gsm_state));
((gsm) state)->nrp = 40;
}
int gsmStateBytes(void) {
/* Return the size of a GSM state record in bytes. */
return sizeof(struct gsm_state);
}
|
