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

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Macros

#define contrl_1   contrl_
 

Functions

int encode_ (integer *voice, integer *pitch, real *rms, real *rc, integer *ipitch, integer *irms, integer *irc)
 

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 41 of file encode.c.

Referenced by encode_().

Function Documentation

◆ encode_()

int encode_ ( integer voice,
integer pitch,
real rms,
real rc,
integer ipitch,
integer irms,
integer irc 
)

Definition at line 111 of file encode.c.

References c__2, contrl_1, max, min, and pow_ii().

Referenced by lpc10_encode().

113 {
114  /* Initialized data */
115 
116  static integer enctab[16] = { 0,7,11,12,13,10,6,1,14,9,5,2,3,4,8,15 };
117  static integer entau[60] = { 19,11,27,25,29,21,23,22,30,14,15,7,39,38,46,
118  42,43,41,45,37,53,49,51,50,54,52,60,56,58,26,90,88,92,84,86,82,83,
119  81,85,69,77,73,75,74,78,70,71,67,99,97,113,112,114,98,106,104,108,
120  100,101,76 };
121  static integer enadd[8] = { 1920,-768,2432,1280,3584,1536,2816,-1152 };
122  static real enscl[8] = { .0204f,.0167f,.0145f,.0147f,.0143f,.0135f,.0125f,
123  .0112f };
124  static integer enbits[8] = { 6,5,4,4,4,4,3,3 };
125  static integer entab6[64] = { 0,0,0,0,0,0,1,1,1,1,1,1,1,2,2,2,2,2,2,2,3,3,
126  3,3,3,3,3,4,4,4,4,4,4,4,5,5,5,5,5,6,6,6,6,6,7,7,7,7,7,8,8,8,8,9,9,
127  9,10,10,11,11,12,13,14,15 };
128  static integer rmst[64] = { 1024,936,856,784,718,656,600,550,502,460,420,
129  384,352,328,294,270,246,226,206,188,172,158,144,132,120,110,102,
130  92,84,78,70,64,60,54,50,46,42,38,34,32,30,26,24,22,20,18,17,16,15,
131  14,13,12,11,10,9,8,7,6,5,4,3,2,1,0 };
132 
133  /* System generated locals */
134  integer i__1, i__2;
135 
136  /* Builtin functions */
138 
139  /* Local variables */
140  integer idel, nbit, i__, j, i2, i3, mrk;
141 
142 /* $Log$
143  * Revision 1.15 2004/06/26 03:50:14 markster
144  * Merge source cleanups (bug #1911)
145  *
146  * Revision 1.14 2003/02/12 13:59:15 matteo
147  * mer feb 12 14:56:57 CET 2003
148  *
149  * Revision 1.1.1.1 2003/02/12 13:59:15 matteo
150  * mer feb 12 14:56:57 CET 2003
151  *
152  * Revision 1.2 2000/01/05 08:20:39 markster
153  * Some OSS fixes and a few lpc changes to make it actually work
154  *
155  * Revision 1.1 1996/08/19 22:32:21 jaf
156  * Initial revision
157  * */
158 /* Revision 1.3 1996/03/29 22:03:47 jaf */
159 /* Removed definitions for any constants that were no longer used. */
160 
161 /* Revision 1.2 1996/03/26 19:34:33 jaf */
162 /* Added comments indicating which constants are not needed in an */
163 /* application that uses the LPC-10 coder. */
164 
165 /* Revision 1.1 1996/02/07 14:43:51 jaf */
166 /* Initial revision */
167 
168 /* LPC Configuration parameters: */
169 /* Frame size, Prediction order, Pitch period */
170 /* Arguments */
171 /* $Log$
172  * Revision 1.15 2004/06/26 03:50:14 markster
173  * Merge source cleanups (bug #1911)
174  *
175  * Revision 1.14 2003/02/12 13:59:15 matteo
176  * mer feb 12 14:56:57 CET 2003
177  *
178  * Revision 1.1.1.1 2003/02/12 13:59:15 matteo
179  * mer feb 12 14:56:57 CET 2003
180  *
181  * Revision 1.2 2000/01/05 08:20:39 markster
182  * Some OSS fixes and a few lpc changes to make it actually work
183  *
184  * Revision 1.1 1996/08/19 22:32:21 jaf
185  * Initial revision
186  * */
187 /* Revision 1.3 1996/03/29 22:05:55 jaf */
188 /* Commented out the common block variables that are not needed by the */
189 /* embedded version. */
190 
191 /* Revision 1.2 1996/03/26 19:34:50 jaf */
192 /* Added comments indicating which constants are not needed in an */
193 /* application that uses the LPC-10 coder. */
194 
195 /* Revision 1.1 1996/02/07 14:44:09 jaf */
196 /* Initial revision */
197 
198 /* LPC Processing control variables: */
199 
200 /* *** Read-only: initialized in setup */
201 
202 /* Files for Speech, Parameter, and Bitstream Input & Output, */
203 /* and message and debug outputs. */
204 
205 /* Here are the only files which use these variables: */
206 
207 /* lpcsim.f setup.f trans.f error.f vqsetup.f */
208 
209 /* Many files which use fdebug are not listed, since it is only used in */
210 /* those other files conditionally, to print trace statements. */
211 /* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
212 /* LPC order, Frame size, Quantization rate, Bits per frame, */
213 /* Error correction */
214 /* Subroutine SETUP is the only place where order is assigned a value, */
215 /* and that value is 10. It could increase efficiency 1% or so to */
216 /* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
217 */
218 /* a variable in a COMMON block, since it is used in many places in the */
219 /* core of the coding and decoding routines. Actually, I take that back.
220 */
221 /* At least when compiling with f2c, the upper bound of DO loops is */
222 /* stored in a local variable before the DO loop begins, and then that is
223 */
224 /* compared against on each iteration. */
225 /* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
226 /* Similarly for quant, which is given a value of 2400 in SETUP. quant */
227 /* is used in only a few places, and never in the core coding and */
228 /* decoding routines, so it could be eliminated entirely. */
229 /* nbits is similar to quant, and is given a value of 54 in SETUP. */
230 /* corrp is given a value of .TRUE. in SETUP, and is only used in the */
231 /* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
232 /* coder significantly whether it is .TRUE. or .FALSE., or whether it is
233 */
234 /* a constant or a variable, since it is only examined once per frame. */
235 /* Leaving it as a variable that is set to .TRUE. seems like a good */
236 /* idea, since it does enable some error-correction capability for */
237 /* unvoiced frames, with no change in the coding rate, and no noticeable
238 */
239 /* quality difference in the decoded speech. */
240 /* integer quant, nbits */
241 /* *** Read/write: variables for debugging, not needed for LPC algorithm
242 */
243 
244 /* Current frame, Unstable frames, Output clip count, Max onset buffer,
245 */
246 /* Debug listing detail level, Line count on listing page */
247 
248 /* nframe is not needed for an embedded LPC10 at all. */
249 /* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
250 /* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
251 /* an application, I would recommend removing the call to ERROR in RCCHK,
252 */
253 /* and remove ERROR and nunsfm completely. */
254 /* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
255 */
256 /* sread.f. When LPC10 is embedded into an application, one might want */
257 /* to cause it to be incremented in a routine that takes the output of */
258 /* SYNTHS and sends it to an audio device. It could be optionally */
259 /* displayed, for those that might want to know what it is. */
260 /* maxosp is never initialized to 0 in SETUP, although it probably should
261 */
262 /* be, and it is updated in subroutine ANALYS. I doubt that its value */
263 /* would be of much interest to an application in which LPC10 is */
264 /* embedded. */
265 /* listl and lincnt are not needed for an embedded LPC10 at all. */
266 /* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
267 /* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
268 /* common /contrl/ quant, nbits */
269 /* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
270 /* Parameters/constants */
271 /* These arrays are not Fortran PARAMETER's, but they are defined */
272 /* by DATA statements below, and their contents are never altered.
273 */
274 /* Local variables that need not be saved */
275  /* Parameter adjustments */
276  --irc;
277  --rc;
278  --voice;
279 
280  /* Function Body */
281 /* Scale RMS and RC's to integers */
282  *irms = (integer)*rms;
283  i__1 = contrl_1.order;
284  for (i__ = 1; i__ <= i__1; ++i__) {
285  irc[i__] = (integer)(rc[i__] * 32768.f);
286  }
287 /* IF(LISTL.GE.3)WRITE(FDEBUG,800)VOICE,PITCH,IRMS,(IRC(I),I=1,ORDER) */
288 /* 800 FORMAT(1X,/,' <<ENCODE IN>>',T32,2I3,I6,I5,T50,10I8) */
289 /* Encode pitch and voicing */
290  if (voice[1] != 0 && voice[2] != 0) {
291  *ipitch = entau[*pitch - 1];
292  } else {
293  if (contrl_1.corrp) {
294  *ipitch = 0;
295  if (voice[1] != voice[2]) {
296  *ipitch = 127;
297  }
298  } else {
299  *ipitch = (voice[1] << 1) + voice[2];
300  }
301  }
302 /* Encode RMS by binary table search */
303  j = 32;
304  idel = 16;
305  *irms = min(*irms,1023);
306  while(idel > 0) {
307  if (*irms > rmst[j - 1]) {
308  j -= idel;
309  }
310  if (*irms < rmst[j - 1]) {
311  j += idel;
312  }
313  idel /= 2;
314  }
315  if (*irms > rmst[j - 1]) {
316  --j;
317  }
318  *irms = 31 - j / 2;
319 /* Encode RC(1) and (2) as log-area-ratios */
320  for (i__ = 1; i__ <= 2; ++i__) {
321  i2 = irc[i__];
322  mrk = 0;
323  if (i2 < 0) {
324  i2 = -i2;
325  mrk = 1;
326  }
327  i2 /= 512;
328  i2 = min(i2,63);
329  i2 = entab6[i2];
330  if (mrk != 0) {
331  i2 = -i2;
332  }
333  irc[i__] = i2;
334  }
335 /* Encode RC(3) - (10) linearly, remove bias then scale */
336  i__1 = contrl_1.order;
337  for (i__ = 3; i__ <= i__1; ++i__) {
338  i2 = irc[i__] / 2;
339  i2 = (integer)((i2 + enadd[contrl_1.order + 1 - i__ - 1]) * enscl[
340  contrl_1.order + 1 - i__ - 1]);
341 /* Computing MIN */
342  i__2 = max(i2,-127);
343  i2 = min(i__2,127);
344  nbit = enbits[contrl_1.order + 1 - i__ - 1];
345  i3 = 0;
346  if (i2 < 0) {
347  i3 = -1;
348  }
349  i2 /= pow_ii(&c__2, &nbit);
350  if (i3 == -1) {
351  --i2;
352  }
353  irc[i__] = i2;
354  }
355 /* Protect the most significant bits of the most */
356 /* important parameters during non-voiced frames. */
357 /* RC(1) - RC(4) are protected using 20 parity bits */
358 /* replacing RC(5) - RC(10). */
359  if (contrl_1.corrp) {
360  if (*ipitch == 0 || *ipitch == 127) {
361  irc[5] = enctab[(irc[1] & 30) / 2];
362  irc[6] = enctab[(irc[2] & 30) / 2];
363  irc[7] = enctab[(irc[3] & 30) / 2];
364  irc[8] = enctab[(*irms & 30) / 2];
365  irc[9] = enctab[(irc[4] & 30) / 2] / 2;
366  irc[10] = enctab[(irc[4] & 30) / 2] & 1;
367  }
368  }
369 /* IF(LISTL.GE.3)WRITE(FDEBUG,801)VOICE,IPITCH,IRMS,(IRC(J),J=1,ORDER) */
370 /* 801 FORMAT(1X,'<<ENCODE OUT>>',T32,2I3,I6,I5,T50,10I8) */
371  return 0;
372 } /* encode_ */
#define contrl_1
Definition: encode.c:41
static integer c__2
Definition: encode.c:45
integer pow_ii(integer *ap, integer *bp)
Definition: f2clib.c:30
float real
Definition: lpc10.h:79
#define min(a, b)
Definition: f2c.h:197
INT32 integer
Definition: lpc10.h:80
#define max(a, b)
Definition: f2c.h:198

Variable Documentation

◆ c__2

integer c__2 = 2
static

Definition at line 45 of file encode.c.

Referenced by encode_().

◆ contrl_

struct { ... } contrl_

◆ corrp

logical corrp

Definition at line 38 of file encode.c.

◆ lframe

integer lframe

Definition at line 37 of file encode.c.

◆ order

integer order

Definition at line 37 of file encode.c.