Asterisk - The Open Source Telephony Project  18.5.0
Macros | Functions | Variables
lpc10/decode.c File Reference
#include "f2c.h"
Include dependency graph for lpc10/decode.c:

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Macros

#define contrl_1   contrl_
 

Functions

int decode_ (integer *ipitv, integer *irms, integer *irc, integer *voice, integer *pitch, real *rms, real *rc, struct lpc10_decoder_state *st)
 

Variables

static integer c__2 = 2
 
struct {
   logical   corrp
 
   integer   lframe
 
   integer   order
 
contrl_
 

Macro Definition Documentation

◆ contrl_1

#define contrl_1   contrl_

Definition at line 54 of file lpc10/decode.c.

Referenced by decode_().

Function Documentation

◆ decode_()

int decode_ ( integer ipitv,
integer irms,
integer irc,
integer voice,
integer pitch,
real rms,
real rc,
struct lpc10_decoder_state st 
)

Definition at line 147 of file lpc10/decode.c.

References abs, c__2, contrl_1, lpc10_decoder_state::dpit, lpc10_decoder_state::drc, lpc10_decoder_state::drms, lpc10_decoder_state::erate, FALSE_, lpc10_decoder_state::first, first, ham84_(), lpc10_decoder_state::iavgp, lpc10_decoder_state::iovoic, lpc10_decoder_state::iptold, lpc10_decoder_state::ivp2h, median_(), and pow_ii().

Referenced by lpc10_decode().

150 {
151  /* Initialized data */
152 
153  logical *first;
154  static integer ethrs = 2048;
155  static integer ethrs1 = 128;
156  static integer ethrs2 = 1024;
157  static integer ethrs3 = 2048;
158  static integer ivtab[32] = { 24960,24960,24960,24960,25480,25480,25483,
159  25480,16640,1560,1560,1560,16640,1816,1563,1560,24960,24960,24859,
160  24856,26001,25881,25915,25913,1560,1560,7800,3640,1561,1561,3643,
161  3641 };
162  static real corth[32] /* was [4][8] */ = { 32767.f,10.f,5.f,0.f,
163  32767.f,8.f,4.f,0.f,32.f,6.4f,3.2f,0.f,32.f,6.4f,3.2f,0.f,32.f,
164  11.2f,6.4f,0.f,32.f,11.2f,6.4f,0.f,16.f,5.6f,3.2f,0.f,16.f,5.6f,
165  3.2f,0.f };
166  static integer detau[128] = { 0,0,0,3,0,3,3,31,0,3,3,21,3,3,29,30,0,3,3,
167  20,3,25,27,26,3,23,58,22,3,24,28,3,0,3,3,3,3,39,33,32,3,37,35,36,
168  3,38,34,3,3,42,46,44,50,40,48,3,54,3,56,3,52,3,3,1,0,3,3,108,3,78,
169  100,104,3,84,92,88,156,80,96,3,3,74,70,72,66,76,68,3,62,3,60,3,64,
170  3,3,1,3,116,132,112,148,152,3,3,140,3,136,3,144,3,3,1,124,120,128,
171  3,3,3,3,1,3,3,3,1,3,1,1,1 };
172  static integer rmst[64] = { 1024,936,856,784,718,656,600,550,502,460,420,
173  384,352,328,294,270,246,226,206,188,172,158,144,132,120,110,102,
174  92,84,78,70,64,60,54,50,46,42,38,34,32,30,26,24,22,20,18,17,16,15,
175  14,13,12,11,10,9,8,7,6,5,4,3,2,1,0 };
176  static integer detab7[32] = { 4,11,18,25,32,39,46,53,60,66,72,77,82,87,92,
177  96,101,104,108,111,114,115,117,119,121,122,123,124,125,126,127,
178  127 };
179  static real descl[8] = { .6953f,.625f,.5781f,.5469f,.5312f,.5391f,.4688f,
180  .3828f };
181  integer *ivp2h;
182  static integer deadd[8] = { 1152,-2816,-1536,-3584,-1280,-2432,768,-1920 }
183  ;
184  static integer qb[8] = { 511,511,1023,1023,1023,1023,2047,4095 };
185  static integer nbit[10] = { 8,8,5,5,4,4,4,4,3,2 };
186  static integer zrc[10] = { 0,0,0,0,0,3,0,2,0,0 };
187  static integer bit[5] = { 2,4,8,16,32 };
188  integer *iovoic;
189  integer *iavgp;
190  integer *iptold;
191  integer *erate;
192  integer *drc;
193  integer *dpit;
194  integer *drms;
195 
196  /* System generated locals */
197  integer i__1, i__2;
198 
199  /* Builtin functions */
201 
202  /* Local variables */
203  extern /* Subroutine */ int ham84_(integer *, integer *, integer *);
204  integer ipit, iout, i__, icorf, index, ivoic, ixcor, i1, i2, i4;
205  extern integer median_(integer *, integer *, integer *);
206  integer ishift, errcnt, lsb;
207 
208 /* $Log$
209  * Revision 1.16 2004/06/26 03:50:14 markster
210  * Merge source cleanups (bug #1911)
211  *
212  * Revision 1.15 2003/09/19 01:20:22 markster
213  * Code cleanups (bug #66)
214  *
215  * Revision 1.2 2003/09/19 01:20:22 markster
216  * Code cleanups (bug #66)
217  *
218  * Revision 1.1.1.1 2003/02/12 13:59:14 matteo
219  * mer feb 12 14:56:57 CET 2003
220  *
221  * Revision 1.2 2000/01/05 08:20:39 markster
222  * Some OSS fixes and a few lpc changes to make it actually work
223  *
224  * Revision 1.2 1996/08/20 20:22:39 jaf
225  * Removed all static local variables that were SAVE'd in the Fortran
226  * code, and put them in struct lpc10_decoder_state that is passed as an
227  * argument.
228  *
229  * Removed init function, since all initialization is now done in
230  * init_lpc10_decoder_state().
231  *
232  * Revision 1.1 1996/08/19 22:32:38 jaf
233  * Initial revision
234  * */
235 /* Revision 1.3 1996/03/29 22:03:47 jaf */
236 /* Removed definitions for any constants that were no longer used. */
237 
238 /* Revision 1.2 1996/03/26 19:34:33 jaf */
239 /* Added comments indicating which constants are not needed in an */
240 /* application that uses the LPC-10 coder. */
241 
242 /* Revision 1.1 1996/02/07 14:43:51 jaf */
243 /* Initial revision */
244 
245 /* LPC Configuration parameters: */
246 /* Frame size, Prediction order, Pitch period */
247 /* Arguments */
248 /* $Log$
249  * Revision 1.16 2004/06/26 03:50:14 markster
250  * Merge source cleanups (bug #1911)
251  *
252  * Revision 1.15 2003/09/19 01:20:22 markster
253  * Code cleanups (bug #66)
254  *
255  * Revision 1.2 2003/09/19 01:20:22 markster
256  * Code cleanups (bug #66)
257  *
258  * Revision 1.1.1.1 2003/02/12 13:59:14 matteo
259  * mer feb 12 14:56:57 CET 2003
260  *
261  * Revision 1.2 2000/01/05 08:20:39 markster
262  * Some OSS fixes and a few lpc changes to make it actually work
263  *
264  * Revision 1.2 1996/08/20 20:22:39 jaf
265  * Removed all static local variables that were SAVE'd in the Fortran
266  * code, and put them in struct lpc10_decoder_state that is passed as an
267  * argument.
268  *
269  * Removed init function, since all initialization is now done in
270  * init_lpc10_decoder_state().
271  *
272  * Revision 1.1 1996/08/19 22:32:38 jaf
273  * Initial revision
274  * */
275 /* Revision 1.3 1996/03/29 22:05:55 jaf */
276 /* Commented out the common block variables that are not needed by the */
277 /* embedded version. */
278 
279 /* Revision 1.2 1996/03/26 19:34:50 jaf */
280 /* Added comments indicating which constants are not needed in an */
281 /* application that uses the LPC-10 coder. */
282 
283 /* Revision 1.1 1996/02/07 14:44:09 jaf */
284 /* Initial revision */
285 
286 /* LPC Processing control variables: */
287 
288 /* *** Read-only: initialized in setup */
289 
290 /* Files for Speech, Parameter, and Bitstream Input & Output, */
291 /* and message and debug outputs. */
292 
293 /* Here are the only files which use these variables: */
294 
295 /* lpcsim.f setup.f trans.f error.f vqsetup.f */
296 
297 /* Many files which use fdebug are not listed, since it is only used in */
298 /* those other files conditionally, to print trace statements. */
299 /* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
300 /* LPC order, Frame size, Quantization rate, Bits per frame, */
301 /* Error correction */
302 /* Subroutine SETUP is the only place where order is assigned a value, */
303 /* and that value is 10. It could increase efficiency 1% or so to */
304 /* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
305 */
306 /* a variable in a COMMON block, since it is used in many places in the */
307 /* core of the coding and decoding routines. Actually, I take that back.
308 */
309 /* At least when compiling with f2c, the upper bound of DO loops is */
310 /* stored in a local variable before the DO loop begins, and then that is
311 */
312 /* compared against on each iteration. */
313 /* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
314 /* Similarly for quant, which is given a value of 2400 in SETUP. quant */
315 /* is used in only a few places, and never in the core coding and */
316 /* decoding routines, so it could be eliminated entirely. */
317 /* nbits is similar to quant, and is given a value of 54 in SETUP. */
318 /* corrp is given a value of .TRUE. in SETUP, and is only used in the */
319 /* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
320 /* coder significantly whether it is .TRUE. or .FALSE., or whether it is
321 */
322 /* a constant or a variable, since it is only examined once per frame. */
323 /* Leaving it as a variable that is set to .TRUE. seems like a good */
324 /* idea, since it does enable some error-correction capability for */
325 /* unvoiced frames, with no change in the coding rate, and no noticeable
326 */
327 /* quality difference in the decoded speech. */
328 /* integer quant, nbits */
329 /* *** Read/write: variables for debugging, not needed for LPC algorithm
330 */
331 
332 /* Current frame, Unstable frames, Output clip count, Max onset buffer,
333 */
334 /* Debug listing detail level, Line count on listing page */
335 
336 /* nframe is not needed for an embedded LPC10 at all. */
337 /* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
338 /* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
339 /* an application, I would recommend removing the call to ERROR in RCCHK,
340 */
341 /* and remove ERROR and nunsfm completely. */
342 /* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
343 */
344 /* sread.f. When LPC10 is embedded into an application, one might want */
345 /* to cause it to be incremented in a routine that takes the output of */
346 /* SYNTHS and sends it to an audio device. It could be optionally */
347 /* displayed, for those that might want to know what it is. */
348 /* maxosp is never initialized to 0 in SETUP, although it probably should
349 */
350 /* be, and it is updated in subroutine ANALYS. I doubt that its value */
351 /* would be of much interest to an application in which LPC10 is */
352 /* embedded. */
353 /* listl and lincnt are not needed for an embedded LPC10 at all. */
354 /* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
355 /* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
356 /* common /contrl/ quant, nbits */
357 /* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
358 /* Function return value definitions */
359 
360 /* Parameters/constants */
361 
362 /* The variables below that are not Fortran PARAMETER's are */
363 /* initialized with DATA statements, and then never modified. */
364 /* The following are used regardless of CORRP's value. */
365 
366 /* DETAU, NBIT, QB, DEADD, DETAB7, RMST, DESCL */
367 
368 /* The following are used only if CORRP is .TRUE. */
369 
370 /* ETHRS, ETHRS1, ETHRS2, ETHRS3, IVTAB, BIT, CORTH, ZRC */
371 
372 /* Local variables that need not be saved */
373 
374 /* The following are used regardless of CORRP's value */
375 /* The following are used only if CORRP is .TRUE. */
376 
377 /* Local state */
378 
379 /* The following are used regardless of CORRP's value */
380 /* The following are used only if CORRP is .TRUE. */
381 /* I am guessing the initial values for IVP2H, IOVOIC, DRC, DPIT, */
382 /* and DRMS. They should be checked to see if they are reasonable.
383 */
384 /* I'm also guessing for ERATE, but I think 0 is the right initial
385 */
386 /* value. */
387  /* Parameter adjustments */
388  if (irc) {
389  --irc;
390  }
391  if (voice) {
392  --voice;
393  }
394  if (rc) {
395  --rc;
396  }
397 
398  /* Function Body */
399 
400  iptold = &(st->iptold);
401  first = &(st->first);
402  ivp2h = &(st->ivp2h);
403  iovoic = &(st->iovoic);
404  iavgp = &(st->iavgp);
405  erate = &(st->erate);
406  drc = &(st->drc[0]);
407  dpit = &(st->dpit[0]);
408  drms = &(st->drms[0]);
409 
410 /* DATA statements for "constants" defined above. */
411 /* IF (LISTL.GE.3) WRITE(FDEBUG,800) IPITV,IRMS,(IRC(J),J=1,ORDER) */
412 /* 800 FORMAT(1X,' <<ERRCOR IN>>',T32,6X,I6,I5,T50,10I8) */
413 /* If no error correction, do pitch and voicing then jump to decode */
414  i4 = detau[*ipitv];
415  if (! contrl_1.corrp) {
416  voice[1] = 1;
417  voice[2] = 1;
418  if (*ipitv <= 1) {
419  voice[1] = 0;
420  }
421  if (*ipitv == 0 || *ipitv == 2) {
422  voice[2] = 0;
423  }
424  *pitch = i4;
425  if (*pitch <= 4) {
426  *pitch = *iptold;
427  }
428  if (voice[1] == 1 && voice[2] == 1) {
429  *iptold = *pitch;
430  }
431  if (voice[1] != voice[2]) {
432  *pitch = *iptold;
433  }
434  goto L900;
435  }
436 /* Do error correction pitch and voicing */
437  if (i4 > 4) {
438  dpit[0] = i4;
439  ivoic = 2;
440  *iavgp = (*iavgp * 15 + i4 + 8) / 16;
441  } else {
442  ivoic = i4;
443  dpit[0] = *iavgp;
444  }
445  drms[0] = *irms;
446  i__1 = contrl_1.order;
447  for (i__ = 1; i__ <= i__1; ++i__) {
448  drc[i__ * 3 - 3] = irc[i__];
449  }
450 /* Determine index to IVTAB from V/UV decision */
451 /* If error rate is high then use alternate table */
452  index = (*ivp2h << 4) + (*iovoic << 2) + ivoic + 1;
453  i1 = ivtab[index - 1];
454  ipit = i1 & 3;
455  icorf = i1 / 8;
456  if (*erate < ethrs) {
457  icorf /= 64;
458  }
459 /* Determine error rate: 4=high 1=low */
460  ixcor = 4;
461  if (*erate < ethrs3) {
462  ixcor = 3;
463  }
464  if (*erate < ethrs2) {
465  ixcor = 2;
466  }
467  if (*erate < ethrs1) {
468  ixcor = 1;
469  }
470 /* Voice/unvoice decision determined from bits 0 and 1 of IVTAB */
471  voice[1] = icorf / 2 & 1;
472  voice[2] = icorf & 1;
473 /* Skip decoding on first frame because present data not yet available */
474  if (*first) {
475  *first = FALSE_;
476 /* Assign PITCH a "default" value on the first call, since */
477 /* otherwise it would be left uninitialized. The two lines
478 */
479 /* below were copied from above, since it seemed like a */
480 /* reasonable thing to do for the first call. */
481  *pitch = i4;
482  if (*pitch <= 4) {
483  *pitch = *iptold;
484  }
485  goto L500;
486  }
487 /* If bit 4 of ICORF is set then correct RMS and RC(1) - RC(4). */
488 /* Determine error rate and correct errors using a Hamming 8,4 code */
489 /* during transition or unvoiced frame. If IOUT is negative, */
490 /* more than 1 error occurred, use previous frame's parameters. */
491  if ((icorf & bit[3]) != 0) {
492  errcnt = 0;
493  lsb = drms[1] & 1;
494  index = (drc[22] << 4) + drms[1] / 2;
495  ham84_(&index, &iout, &errcnt);
496  drms[1] = drms[2];
497  if (iout >= 0) {
498  drms[1] = (iout << 1) + lsb;
499  }
500  for (i__ = 1; i__ <= 4; ++i__) {
501  if (i__ == 1) {
502  i1 = ((drc[25] & 7) << 1) + (drc[28] & 1);
503  } else {
504  i1 = drc[(9 - i__) * 3 - 2] & 15;
505  }
506  i2 = drc[(5 - i__) * 3 - 2] & 31;
507  lsb = i2 & 1;
508  index = (i1 << 4) + i2 / 2;
509  ham84_(&index, &iout, &errcnt);
510  if (iout >= 0) {
511  iout = (iout << 1) + lsb;
512  if ((iout & 16) == 16) {
513  iout += -32;
514  }
515  } else {
516  iout = drc[(5 - i__) * 3 - 1];
517  }
518  drc[(5 - i__) * 3 - 2] = iout;
519  }
520 /* Determine error rate */
521  *erate = (integer)(*erate * .96875f + errcnt * 102);
522  }
523 /* Get unsmoothed RMS, RC's, and PITCH */
524  *irms = drms[1];
525  i__1 = contrl_1.order;
526  for (i__ = 1; i__ <= i__1; ++i__) {
527  irc[i__] = drc[i__ * 3 - 2];
528  }
529  if (ipit == 1) {
530  dpit[1] = dpit[2];
531  }
532  if (ipit == 3) {
533  dpit[1] = dpit[0];
534  }
535  *pitch = dpit[1];
536 /* If bit 2 of ICORF is set then smooth RMS and RC's, */
537  if ((icorf & bit[1]) != 0) {
538  if ((i__1 = drms[1] - drms[0], (real) abs(i__1)) >= corth[ixcor + 3]
539  && (i__2 = drms[1] - drms[2], (real) abs(i__2)) >= corth[
540  ixcor + 3]) {
541  *irms = median_(&drms[2], &drms[1], drms);
542  }
543  for (i__ = 1; i__ <= 6; ++i__) {
544  if ((i__1 = drc[i__ * 3 - 2] - drc[i__ * 3 - 3], (real) abs(i__1))
545  >= corth[ixcor + ((i__ + 2) << 2) - 5] && (i__2 = drc[i__ *
546  3 - 2] - drc[i__ * 3 - 1], (real) abs(i__2)) >= corth[
547  ixcor + ((i__ + 2) << 2) - 5]) {
548  irc[i__] = median_(&drc[i__ * 3 - 1], &drc[i__ * 3 - 2], &drc[
549  i__ * 3 - 3]);
550  }
551  }
552  }
553 /* If bit 3 of ICORF is set then smooth pitch */
554  if ((icorf & bit[2]) != 0) {
555  if ((i__1 = dpit[1] - dpit[0], (real) abs(i__1)) >= corth[ixcor - 1]
556  && (i__2 = dpit[1] - dpit[2], (real) abs(i__2)) >= corth[
557  ixcor - 1]) {
558  *pitch = median_(&dpit[2], &dpit[1], dpit);
559  }
560  }
561 /* If bit 5 of ICORF is set then RC(5) - RC(10) are loaded with */
562 /* values so that after quantization bias is removed in decode */
563 /* the values will be zero. */
564 L500:
565  if ((icorf & bit[4]) != 0) {
566  i__1 = contrl_1.order;
567  for (i__ = 5; i__ <= i__1; ++i__) {
568  irc[i__] = zrc[i__ - 1];
569  }
570  }
571 /* House keeping - one frame delay */
572  *iovoic = ivoic;
573  *ivp2h = voice[2];
574  dpit[2] = dpit[1];
575  dpit[1] = dpit[0];
576  drms[2] = drms[1];
577  drms[1] = drms[0];
578  i__1 = contrl_1.order;
579  for (i__ = 1; i__ <= i__1; ++i__) {
580  drc[i__ * 3 - 1] = drc[i__ * 3 - 2];
581  drc[i__ * 3 - 2] = drc[i__ * 3 - 3];
582  }
583 L900:
584 /* IF (LISTL.GE.3)WRITE(FDEBUG,801)VOICE,PITCH,IRMS,(IRC(J),J=1,ORDER) */
585 /* 801 FORMAT(1X,'<<ERRCOR OUT>>',T32,2I3,I6,I5,T50,10I8) */
586 /* Decode RMS */
587  *irms = rmst[(31 - *irms) * 2];
588 /* Decode RC(1) and RC(2) from log-area-ratios */
589 /* Protect from illegal coded value (-16) caused by bit errors */
590  for (i__ = 1; i__ <= 2; ++i__) {
591  i2 = irc[i__];
592  i1 = 0;
593  if (i2 < 0) {
594  i1 = 1;
595  i2 = -i2;
596  if (i2 > 15) {
597  i2 = 0;
598  }
599  }
600  i2 = detab7[i2 * 2];
601  if (i1 == 1) {
602  i2 = -i2;
603  }
604  ishift = 15 - nbit[i__ - 1];
605  irc[i__] = i2 * pow_ii(&c__2, &ishift);
606  }
607 /* Decode RC(3)-RC(10) to sign plus 14 bits */
608  i__1 = contrl_1.order;
609  for (i__ = 3; i__ <= i__1; ++i__) {
610  i2 = irc[i__];
611  ishift = 15 - nbit[i__ - 1];
612  i2 *= pow_ii(&c__2, &ishift);
613  i2 += qb[i__ - 3];
614  irc[i__] = (integer)(i2 * descl[i__ - 3] + deadd[i__ - 3]);
615  }
616 /* IF (LISTL.GE.3) WRITE(FDEBUG,811) IRMS, (IRC(I),I=1,ORDER) */
617 /* 811 FORMAT(1X,'<<DECODE OUT>>',T45,I4,1X,10I8) */
618 /* Scale RMS and RC's to reals */
619  *rms = (real) (*irms);
620  i__1 = contrl_1.order;
621  for (i__ = 1; i__ <= i__1; ++i__) {
622  rc[i__] = irc[i__] / 16384.f;
623  }
624  return 0;
625 } /* decode_ */
integer erate
Definition: lpc10.h:157
integer iavgp
Definition: lpc10.h:156
logical first
Definition: lpc10.h:153
integer iptold
Definition: lpc10.h:152
static integer c__2
Definition: lpc10/decode.c:58
#define contrl_1
Definition: lpc10/decode.c:54
integer drms[3]
Definition: lpc10.h:160
integer iovoic
Definition: lpc10.h:155
integer drc[30]
Definition: lpc10.h:158
integer pow_ii(integer *ap, integer *bp)
Definition: f2clib.c:30
integer dpit[3]
Definition: lpc10.h:159
integer median_(integer *d1, integer *d2, integer *d3)
Definition: median.c:69
float real
Definition: lpc10.h:79
struct sla_ringing_trunk * first
Definition: app_meetme.c:1092
integer ivp2h
Definition: lpc10.h:154
#define abs(x)
Definition: f2c.h:195
int ham84_(integer *input, integer *output, integer *errcnt)
Definition: ham84.c:85
INT32 logical
Definition: lpc10.h:81
INT32 integer
Definition: lpc10.h:80
#define FALSE_
Definition: f2c.h:68

Variable Documentation

◆ c__2

integer c__2 = 2
static

Definition at line 58 of file lpc10/decode.c.

Referenced by decode_().

◆ contrl_

struct { ... } contrl_

◆ corrp

logical corrp

Definition at line 51 of file lpc10/decode.c.

◆ lframe

integer lframe

Definition at line 50 of file lpc10/decode.c.

◆ order

integer order

Definition at line 50 of file lpc10/decode.c.