Asterisk - The Open Source Telephony Project GIT-master-27fb039
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Macros | Functions
short_term.c File Reference
#include <stdio.h>
#include <assert.h>
#include "private.h"
#include "gsm.h"
#include "proto.h"
Include dependency graph for short_term.c:

Go to the source code of this file.

Macros

#define FILTER   Short_term_analysis_filtering
 
#define FILTER   Short_term_synthesis_filtering
 
#define STEP(B_TIMES_TWO, MIC, INVA)
 

Functions

static void LARp_to_rp P1 ((LARp), register word *LARp)
 
static void Decoding_of_the_coded_Log_Area_Ratios P2 ((LARc, LARpp), word *LARc, word *LARpp)
 
static void Coefficients_40_159 P2 ((LARpp_j, LARp), register word *LARpp_j, register word *LARp)
 
static void Coefficients_0_12 P3 ((LARpp_j_1, LARpp_j, LARp), register word *LARpp_j_1, register word *LARpp_j, register word *LARp)
 
void Gsm_Short_Term_Analysis_Filter P3 ((S, LARc, s), struct gsm_state *S, word *LARc, word *s)
 
void Gsm_Short_Term_Synthesis_Filter P4 ((S, LARcr, wt, s), struct gsm_state *S, word *LARcr, word *wt, word *s)
 
static void Short_term_analysis_filtering P4 ((u0, rp0, k_n, s), register word *u0, register word *rp0, register int k_n, register word *s)
 
static void Short_term_synthesis_filtering P5 ((S, rrp, k, wt, sr), struct gsm_state *S, register word *rrp, register int k, register word *wt, register word *sr)
 

Macro Definition Documentation

◆ FILTER [1/2]

#define FILTER   Short_term_analysis_filtering

◆ FILTER [2/2]

#define FILTER   Short_term_synthesis_filtering

◆ STEP

#define STEP (   B_TIMES_TWO,
  MIC,
  INVA 
)
Value:
temp1 = GSM_ADD( *LARc++, MIC ) << 10; \
temp1 = GSM_SUB( temp1, B_TIMES_TWO ); \
temp1 = (word)GSM_MULT_R( INVA, temp1 ); \
*LARpp++ = GSM_ADD( temp1, temp1 );
word
short word
Definition codecs/gsm/inc/private.h:12
GSM_MULT_R
#define GSM_MULT_R(a, b)
Definition codecs/gsm/inc/private.h:92
GSM_ADD
static word GSM_ADD(longword a, longword b)
Definition codecs/gsm/inc/private.h:152
GSM_SUB
static word GSM_SUB(longword a, longword b)
Definition codecs/gsm/inc/private.h:159
LARc
#define LARc

Function Documentation

◆ P1()

static void LARp_to_rp P1 ( (LARp)  ,
register word *  LARp 
)
static

Definition at line 145 of file short_term.c.

152{
153 register int i;
154 register word temp;
155
156 for (i = 1; i <= 8; i++, LARp++) {
157
158 /* temp = GSM_ABS( *LARp );
159 *
160 * if (temp < 11059) temp <<= 1;
161 * else if (temp < 20070) temp += 11059;
162 * else temp = GSM_ADD( temp >> 2, 26112 );
163 *
164 * *LARp = *LARp < 0 ? -temp : temp;
165 */
166
167 if (*LARp < 0) {
168 temp = *LARp == MIN_WORD ? MAX_WORD : -(*LARp);
169 *LARp = - ((temp < 11059) ? temp << 1
170 : ((temp < 20070) ? temp + 11059
171 : GSM_ADD( temp >> 2, 26112 )));
172 } else {
173 temp = *LARp;
174 *LARp = (temp < 11059) ? temp << 1
175 : ((temp < 20070) ? temp + 11059
176 : GSM_ADD( temp >> 2, 26112 ));
177 }
178 }
179}
MIN_WORD
#define MIN_WORD
Definition codecs/gsm/inc/private.h:44
MAX_WORD
#define MAX_WORD
Definition codecs/gsm/inc/private.h:45

References GSM_ADD(), MAX_WORD, and MIN_WORD.

◆ P2() [1/2]

static void Decoding_of_the_coded_Log_Area_Ratios P2 ( (LARc, LARpp)  ,
word *  LARc,
word *  LARpp 
)
static

Definition at line 28 of file short_term.c.

31{
32 register word temp1 /* , temp2 */;
33
34 /* This procedure requires for efficient implementation
35 * two tables.
36 *
37 * INVA[1..8] = integer( (32768 * 8) / real_A[1..8])
38 * MIC[1..8] = minimum value of the LARc[1..8]
39 */
40
41 /* Compute the LARpp[1..8]
42 */
43
44 /* for (i = 1; i <= 8; i++, B++, MIC++, INVA++, LARc++, LARpp++) {
45 *
46 * temp1 = GSM_ADD( *LARc, *MIC ) << 10;
47 * temp2 = *B << 1;
48 * temp1 = GSM_SUB( temp1, temp2 );
49 *
50 * assert(*INVA != MIN_WORD);
51 *
52 * temp1 = GSM_MULT_R( *INVA, temp1 );
53 * *LARpp = GSM_ADD( temp1, temp1 );
54 * }
55 */
56
57#undef STEP
58#define STEP( B_TIMES_TWO, MIC, INVA ) \
59 temp1 = GSM_ADD( *LARc++, MIC ) << 10; \
60 temp1 = GSM_SUB( temp1, B_TIMES_TWO ); \
61 temp1 = (word)GSM_MULT_R( INVA, temp1 ); \
62 *LARpp++ = GSM_ADD( temp1, temp1 );
63
64 STEP( 0, -32, 13107 );
65 STEP( 0, -32, 13107 );
66 STEP( 4096, -16, 13107 );
67 STEP( -5120, -16, 13107 );
68
69 STEP( 188, -8, 19223 );
70 STEP( -3584, -8, 17476 );
71 STEP( -682, -4, 31454 );
72 STEP( -2288, -4, 29708 );
73
74 /* NOTE: the addition of *MIC is used to restore
75 * the sign of *LARc.
76 */
77}
STEP
#define STEP(B_TIMES_TWO, MIC, INVA)

References STEP.

◆ P2() [2/2]

static void Coefficients_40_159 P2 ( (LARpp_j, LARp)  ,
register word *  LARpp_j,
register word *  LARp 
)
static

Definition at line 133 of file short_term.c.

136{
137 register int i;
138
139 for (i = 1; i <= 8; i++, LARp++, LARpp_j++)
140 *LARp = *LARpp_j;
141}

◆ P3() [1/2]

static void Coefficients_27_39 P3 ( (LARpp_j_1, LARpp_j, LARp)  ,
register word *  LARpp_j_1,
register word *  LARpp_j,
register word *  LARp 
)
static

Definition at line 95 of file short_term.c.

99{
100 register int i;
101
102 for (i = 1; i <= 8; i++, LARp++, LARpp_j_1++, LARpp_j++) {
103 *LARp = GSM_ADD( SASR( *LARpp_j_1, 2 ), SASR( *LARpp_j, 2 ));
104 *LARp = GSM_ADD( *LARp, SASR( *LARpp_j_1, 1));
105 }
106}
SASR
#define SASR(x, by)
Definition codecs/gsm/inc/private.h:54

References GSM_ADD(), and SASR.

◆ P3() [2/2]

void Gsm_Short_Term_Analysis_Filter P3 ( (S, LARc, s)  ,
struct gsm_state *  S,
word *  LARc,
word *  s 
)

Definition at line 364 of file short_term.c.

371{
372 word * LARpp_j = S->LARpp[ S->j ];
373 word * LARpp_j_1 = S->LARpp[ S->j ^= 1 ];
374
375 word LARp[8];
376
377#undef FILTER
378#if defined(FAST) && defined(USE_FLOAT_MUL)
379# define FILTER (* (S->fast \
380 ? Fast_Short_term_analysis_filtering \
381 : Short_term_analysis_filtering ))
382
383#else
384# define FILTER Short_term_analysis_filtering
385#endif
386
387 Decoding_of_the_coded_Log_Area_Ratios( LARc, LARpp_j );
388
389 Coefficients_0_12( LARpp_j_1, LARpp_j, LARp );
390 LARp_to_rp( LARp );
391 FILTER( S->u, LARp, 13, s);
392
393 Coefficients_13_26( LARpp_j_1, LARpp_j, LARp);
394 LARp_to_rp( LARp );
395 FILTER( S->u, LARp, 14, s + 13);
396
397 Coefficients_27_39( LARpp_j_1, LARpp_j, LARp);
398 LARp_to_rp( LARp );
399 FILTER( S->u, LARp, 13, s + 27);
400
401 Coefficients_40_159( LARpp_j, LARp);
402 LARp_to_rp( LARp );
403 FILTER( S->u, LARp, 120, s + 40);
404
405}
S
#define S(e)
FILTER
#define FILTER

References FILTER, LARc, and S.

◆ P4() [1/2]

void Gsm_Short_Term_Synthesis_Filter P4 ( (S, LARcr, wt, s)  ,
struct gsm_state *  S,
word *  LARcr,
word *  wt,
word *  s 
)

Definition at line 407 of file short_term.c.

415{
416 word * LARpp_j = S->LARpp[ S->j ];
417 word * LARpp_j_1 = S->LARpp[ S->j ^=1 ];
418
419 word LARp[8];
420
421#undef FILTER
422#if defined(FAST) && defined(USE_FLOAT_MUL)
423
424# define FILTER (* (S->fast \
425 ? Fast_Short_term_synthesis_filtering \
426 : Short_term_synthesis_filtering ))
427#else
428# define FILTER Short_term_synthesis_filtering
429#endif
430
431 Decoding_of_the_coded_Log_Area_Ratios( LARcr, LARpp_j );
432
433 Coefficients_0_12( LARpp_j_1, LARpp_j, LARp );
434 LARp_to_rp( LARp );
435 FILTER( S, LARp, 13, wt, s );
436
437 Coefficients_13_26( LARpp_j_1, LARpp_j, LARp);
438 LARp_to_rp( LARp );
439 FILTER( S, LARp, 14, wt + 13, s + 13 );
440
441 Coefficients_27_39( LARpp_j_1, LARpp_j, LARp);
442 LARp_to_rp( LARp );
443 FILTER( S, LARp, 13, wt + 27, s + 27 );
444
445 Coefficients_40_159( LARpp_j, LARp );
446 LARp_to_rp( LARp );
447 FILTER(S, LARp, 120, wt + 40, s + 40);
448}

References FILTER, and S.

◆ P4() [2/2]

static void Short_term_analysis_filtering P4 ( (u0, rp0, k_n, s)  ,
register word *  u0,
register word *  rp0,
register int  k_n,
register word *  s 
)
static

Definition at line 190 of file short_term.c.

206{
207 register word * u_top = u0 + 8;
208 register word * s_top = s + k_n;
209
210 while (s < s_top) {
211 register word *u, *rp ;
212 register longword di, u_out;
213 di = u_out = *s;
214 for (rp=rp0, u=u0; u<u_top;) {
215 register longword ui, rpi;
216 ui = *u;
217 *u++ = (word)u_out;
218 rpi = *rp++;
219 u_out = ui + (((rpi*di)+0x4000)>>15);
220 di = di + (((rpi*ui)+0x4000)>>15);
221 /* make the common case fastest: */
222 if ((u_out == (word)u_out) && (di == (word)di)) continue;
223 /* otherwise do slower fixup (saturation) */
224 if (u_out>MAX_WORD) u_out=MAX_WORD;
225 else if (u_out<MIN_WORD) u_out=MIN_WORD;
226 if (di>MAX_WORD) di=MAX_WORD;
227 else if (di<MIN_WORD) di=MIN_WORD;
228 }
229 *s++ = (word)di;
230 }
231}
longword
long longword
Definition codecs/gsm/inc/private.h:13
di
static float di[4]
Definition tdd.c:58

References di, MAX_WORD, and MIN_WORD.

◆ P5()

static void Short_term_synthesis_filtering P5 ( (S, rrp, k, wt, sr)  ,
struct gsm_state *  S,
register word *  rrp,
register int  k,
register word *  wt,
register word *  sr 
)
static

Definition at line 281 of file short_term.c.

288{
289 register word * v = S->v;
290 register int i;
291 register longword sri;
292
293 while (k--) {
294 sri = *wt++;
295 for (i = 8; i--;) {
296 register longword tmp1, tmp2;
297
298 /* sri = GSM_SUB( sri, gsm_mult_r( rrp[i], v[i] ) );
299 */
300 tmp1 = rrp[i];
301 tmp2 = v[i];
302
303 tmp2 = (( tmp1 * tmp2 + 16384) >> 15) ;
304 /* saturation done below */
305 sri -= tmp2;
306 if (sri != (word)sri) {
307 sri = (sri<0)? MIN_WORD:MAX_WORD;
308 }
309 /* v[i+1] = GSM_ADD( v[i], gsm_mult_r( rrp[i], sri ) );
310 */
311
312 tmp1 = (( tmp1 * sri + 16384) >> 15) ;
313 /* saturation done below */
314 tmp1 += v[i];
315 if (tmp1 != (word)tmp1) {
316 tmp1 = (tmp1<0)? MIN_WORD:MAX_WORD;
317 }
318 v[i+1] = (word)tmp1;
319 }
320 *sr++ = v[0] = (word)sri;
321 }
322}

References MAX_WORD, MIN_WORD, and S.

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