1 /*
2
3 $Log$
4 Revision 1.2 2006/08/01 13:06:49 rjongbloed
5 Added a raft of unvalidated audio codecs from OpenH323 tree
6
7 Revision 1.1.2.1 2006/07/22 14:03:15 rjongbloed
8 Added more plug ins
9
10 Revision 1.1.2.1 2006/05/08 13:49:57 rjongbloed
11 Imported all the audio codec plug ins from OpenH323
12
13 Revision 1.1 2004/05/04 11:16:42 csoutheren
14 Initial version
15
16 Revision 1.1 2000/06/05 04:45:12 robertj
17 Added LPC-10 2400bps codec
18
19 * Revision 1.2 1996/08/20 20:25:29 jaf
20 * Removed all static local variables that were SAVE'd in the Fortran
21 * code, and put them in struct lpc10_encoder_state that is passed as an
22 * argument.
23 *
24 * Removed init function, since all initialization is now done in
25 * init_lpc10_encoder_state().
26 *
27 * Revision 1.1 1996/08/19 22:32:26 jaf
28 * Initial revision
29 *
30
31 */
32
33 #ifdef P_R_O_T_O_T_Y_P_E_S
34 extern int dyptrk_(real *amdf, integer *ltau, integer *minptr, integer *voice, integer *pitch, integer *midx, struct lpc10_encoder_state *st);
35 /* comlen contrl_ 12 */
36 #endif
37
38 /* -- translated by f2c (version 19951025).
39 You must link the resulting object file with the libraries:
40 -lf2c -lm (in that order)
41 */
42
43 #include "f2c.h"
44
45 /* Common Block Declarations */
46
47 extern struct {
48 integer order, lframe;
49 logical corrp;
50 } contrl_;
51
52 #define contrl_1 contrl_
53
54 /* ********************************************************************* */
55
56 /* DYPTRK Version 52 */
57
58 /* $Log$
59 /* Revision 1.2 2006/08/01 13:06:49 rjongbloed
60 /* Added a raft of unvalidated audio codecs from OpenH323 tree
61 /*
62 /* Revision 1.1.2.1 2006/07/22 14:03:15 rjongbloed
63 /* Added more plug ins
64 /*
65 /* Revision 1.1.2.1 2006/05/08 13:49:57 rjongbloed
66 /* Imported all the audio codec plug ins from OpenH323
67 /*
68 /* Revision 1.1 2004/05/04 11:16:42 csoutheren
69 /* Initial version
70 /*
71 /* Revision 1.1 2000/06/05 04:45:12 robertj
72 /* Added LPC-10 2400bps codec
73 /*
74 * Revision 1.2 1996/08/20 20:25:29 jaf
75 * Removed all static local variables that were SAVE'd in the Fortran
76 * code, and put them in struct lpc10_encoder_state that is passed as an
77 * argument.
78 *
79 * Removed init function, since all initialization is now done in
80 * init_lpc10_encoder_state().
81 *
82 * Revision 1.1 1996/08/19 22:32:26 jaf
83 * Initial revision
84 * */
85 /* Revision 1.5 1996/03/26 19:35:35 jaf */
86 /* Commented out trace statements. */
87
88 /* Revision 1.4 1996/03/19 18:03:22 jaf */
89 /* Replaced the initialization "DATA P/60*DEPTH*0/" with "DATA P/120*0/", */
90 /* because apparently Fortran (or at least f2c) can't handle expressions */
91 /* like that. */
92
93 /* Revision 1.3 1996/03/19 17:38:32 jaf */
94 /* Added comments about the local variables that should be saved from one */
95 /* invocation to the next. None of them were given initial values in the */
96 /* original code, but from my testing, it appears that initializing them */
97 /* all to 0 works. */
98
99 /* Added entry INITDYPTRK to reinitialize these local variables. */
100
101 /* Revision 1.2 1996/03/13 16:32:17 jaf */
102 /* Comments added explaining which of the local variables of this */
103 /* subroutine need to be saved from one invocation to the next, and which */
104 /* do not. */
105
106 /* WARNING! Some of them that should are never given initial values in */
107 /* this code. Hopefully, Fortran 77 defines initial values for them, but */
108 /* even so, giving them explicit initial values is preferable. */
109
110 /* Revision 1.1 1996/02/07 14:45:14 jaf */
111 /* Initial revision */
112
113
114 /* ********************************************************************* */
115
116 /* Dynamic Pitch Tracker */
117
118 /* Input: */
119 /* AMDF - Average Magnitude Difference Function array */
120 /* Indices 1 through LTAU read, and MINPTR */
121 /* LTAU - Number of lags in AMDF */
122 /* MINPTR - Location of minimum AMDF value */
123 /* VOICE - Voicing decision */
124 /* Output: */
125 /* PITCH - Smoothed pitch value, 2 frames delayed */
126 /* MIDX - Initial estimate of current frame pitch */
127 /* Compile time constant: */
128 /* DEPTH - Number of frames to trace back */
129
130 /* This subroutine maintains local state from one call to the next. If */
131 /* you want to switch to using a new audio stream for this filter, or */
132 /* reinitialize its state for any other reason, call the ENTRY */
133 /* INITDYPTRK. */
134
dyptrk_(real * amdf,integer * ltau,integer * minptr,integer * voice,integer * pitch,integer * midx,struct lpc10_encoder_state * st)135 /* Subroutine */ int dyptrk_(real *amdf, integer *ltau, integer *
136 minptr, integer *voice, integer *pitch, integer *midx,
137 struct lpc10_encoder_state *st)
138 {
139 /* Initialized data */
140
141 real *s;
142 integer *p;
143 integer *ipoint;
144 real *alphax;
145
146 /* System generated locals */
147 integer i__1;
148
149 /* Local variables */
150 integer pbar;
151 real sbar;
152 integer path[2], iptr, i__, j;
153 real alpha, minsc, maxsc;
154
155 /* Arguments */
156 /* $Log$
157 /* Revision 1.2 2006/08/01 13:06:49 rjongbloed
158 /* Added a raft of unvalidated audio codecs from OpenH323 tree
159 /*
160 /* Revision 1.1.2.1 2006/07/22 14:03:15 rjongbloed
161 /* Added more plug ins
162 /*
163 /* Revision 1.1.2.1 2006/05/08 13:49:57 rjongbloed
164 /* Imported all the audio codec plug ins from OpenH323
165 /*
166 /* Revision 1.1 2004/05/04 11:16:42 csoutheren
167 /* Initial version
168 /*
169 /* Revision 1.1 2000/06/05 04:45:12 robertj
170 /* Added LPC-10 2400bps codec
171 /*
172 * Revision 1.2 1996/08/20 20:25:29 jaf
173 * Removed all static local variables that were SAVE'd in the Fortran
174 * code, and put them in struct lpc10_encoder_state that is passed as an
175 * argument.
176 *
177 * Removed init function, since all initialization is now done in
178 * init_lpc10_encoder_state().
179 *
180 * Revision 1.1 1996/08/19 22:32:26 jaf
181 * Initial revision
182 * */
183 /* Revision 1.3 1996/03/29 22:05:55 jaf */
184 /* Commented out the common block variables that are not needed by the */
185 /* embedded version. */
186
187 /* Revision 1.2 1996/03/26 19:34:50 jaf */
188 /* Added comments indicating which constants are not needed in an */
189 /* application that uses the LPC-10 coder. */
190
191 /* Revision 1.1 1996/02/07 14:44:09 jaf */
192 /* Initial revision */
193
194 /* LPC Processing control variables: */
195
196 /* *** Read-only: initialized in setup */
197
198 /* Files for Speech, Parameter, and Bitstream Input & Output, */
199 /* and message and debug outputs. */
200
201 /* Here are the only files which use these variables: */
202
203 /* lpcsim.f setup.f trans.f error.f vqsetup.f */
204
205 /* Many files which use fdebug are not listed, since it is only used in */
206 /* those other files conditionally, to print trace statements. */
207 /* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
208 /* LPC order, Frame size, Quantization rate, Bits per frame, */
209 /* Error correction */
210 /* Subroutine SETUP is the only place where order is assigned a value, */
211 /* and that value is 10. It could increase efficiency 1% or so to */
212 /* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
213 */
214 /* a variable in a COMMON block, since it is used in many places in the */
215 /* core of the coding and decoding routines. Actually, I take that back.
216 */
217 /* At least when compiling with f2c, the upper bound of DO loops is */
218 /* stored in a local variable before the DO loop begins, and then that is
219 */
220 /* compared against on each iteration. */
221 /* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
222 /* Similarly for quant, which is given a value of 2400 in SETUP. quant */
223 /* is used in only a few places, and never in the core coding and */
224 /* decoding routines, so it could be eliminated entirely. */
225 /* nbits is similar to quant, and is given a value of 54 in SETUP. */
226 /* corrp is given a value of .TRUE. in SETUP, and is only used in the */
227 /* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
228 /* coder significantly whether it is .TRUE. or .FALSE., or whether it is
229 */
230 /* a constant or a variable, since it is only examined once per frame. */
231 /* Leaving it as a variable that is set to .TRUE. seems like a good */
232 /* idea, since it does enable some error-correction capability for */
233 /* unvoiced frames, with no change in the coding rate, and no noticeable
234 */
235 /* quality difference in the decoded speech. */
236 /* integer quant, nbits */
237 /* *** Read/write: variables for debugging, not needed for LPC algorithm
238 */
239
240 /* Current frame, Unstable frames, Output clip count, Max onset buffer,
241 */
242 /* Debug listing detail level, Line count on listing page */
243
244 /* nframe is not needed for an embedded LPC10 at all. */
245 /* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
246 /* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
247 /* an application, I would recommend removing the call to ERROR in RCCHK,
248 */
249 /* and remove ERROR and nunsfm completely. */
250 /* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
251 */
252 /* sread.f. When LPC10 is embedded into an application, one might want */
253 /* to cause it to be incremented in a routine that takes the output of */
254 /* SYNTHS and sends it to an audio device. It could be optionally */
255 /* displayed, for those that might want to know what it is. */
256 /* maxosp is never initialized to 0 in SETUP, although it probably should
257 */
258 /* be, and it is updated in subroutine ANALYS. I doubt that its value */
259 /* would be of much interest to an application in which LPC10 is */
260 /* embedded. */
261 /* listl and lincnt are not needed for an embedded LPC10 at all. */
262 /* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
263 /* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
264 /* common /contrl/ quant, nbits */
265 /* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
266 /* Parameters/constants */
267 /* Local variables that need not be saved */
268 /* Note that PATH is only used for debugging purposes, and can be */
269 /* removed. */
270 /* Local state */
271 /* It would be a bit more "general" to define S(LTAU), if Fortran */
272 /* allows the argument of a function to be used as the dimension of
273 */
274 /* a local array variable. */
275 /* IPOINT is always in the range 0 to DEPTH-1. */
276 /* WARNING! */
277
278 /* In the original version of this subroutine, IPOINT, ALPHAX, */
279 /* every element of S, and potentially any element of P with the */
280 /* second index value .NE. IPTR were read without being given */
281 /* initial values (all indices of P with second index equal to */
282 /* IPTR are all written before being read in this subroutine). */
283
284 /* From examining the code carefully, it appears that all of these
285 */
286 /* should be saved from one invocation to the next. */
287
288 /* I've run lpcsim with the "-l 6" option to see all of the */
289 /* debugging information that is printed out by this subroutine */
290 /* below, and it appears that S, P, IPOINT, and ALPHAX are all */
291 /* initialized to 0 (these initial values would likely be different
292 */
293 /* on different platforms, compilers, etc.). Given that the output
294 */
295 /* of the coder sounds reasonable, I'm going to initialize these */
296 /* variables to 0 explicitly. */
297
298 s = &(st->s[0]);
299 p = &(st->p[0]);
300 ipoint = &(st->ipoint);
301 alphax = &(st->alphax);
302
303
304 /* Parameter adjustments */
305 if (amdf) {
306 --amdf;
307 }
308
309 /* Function Body */
310
311 /* Calculate the confidence factor ALPHA, used as a threshold slope in
312 */
313 /* SEESAW. If unvoiced, set high slope so that every point in P array
314 */
315 /* is marked as a potential pitch frequency. A scaled up version (ALPHAX
316 )*/
317 /* is used to maintain arithmetic precision. */
318 if (*voice == 1) {
319 *alphax = *alphax * .75f + amdf[*minptr] / 2.f;
320 } else {
321 *alphax *= .984375f;
322 }
323 alpha = *alphax / 16;
324 if (*voice == 0 && *alphax < 128.f) {
325 alpha = 8.f;
326 }
327 /* SEESAW: Construct a pitch pointer array and intermediate winner functio
328 n*/
329 /* Left to right pass: */
330 iptr = *ipoint + 1;
331 p[iptr * 60 - 60] = 1;
332 i__ = 1;
333 pbar = 1;
334 sbar = s[0];
335 i__1 = *ltau;
336 for (i__ = 1; i__ <= i__1; ++i__) {
337 sbar += alpha;
338 if (sbar < s[i__ - 1]) {
339 s[i__ - 1] = sbar;
340 p[i__ + iptr * 60 - 61] = pbar;
341 } else {
342 sbar = s[i__ - 1];
343 p[i__ + iptr * 60 - 61] = i__;
344 pbar = i__;
345 }
346 }
347 /* Right to left pass: */
348 i__ = pbar - 1;
349 sbar = s[i__];
350 while(i__ >= 1) {
351 sbar += alpha;
352 if (sbar < s[i__ - 1]) {
353 s[i__ - 1] = sbar;
354 p[i__ + iptr * 60 - 61] = pbar;
355 } else {
356 pbar = p[i__ + iptr * 60 - 61];
357 i__ = pbar;
358 sbar = s[i__ - 1];
359 }
360 --i__;
361 }
362 /* Update S using AMDF */
363 /* Find maximum, minimum, and location of minimum */
364 s[0] += amdf[1] / 2;
365 minsc = s[0];
366 maxsc = minsc;
367 *midx = 1;
368 i__1 = *ltau;
369 for (i__ = 2; i__ <= i__1; ++i__) {
370 s[i__ - 1] += amdf[i__] / 2;
371 if (s[i__ - 1] > maxsc) {
372 maxsc = s[i__ - 1];
373 }
374 if (s[i__ - 1] < minsc) {
375 *midx = i__;
376 minsc = s[i__ - 1];
377 }
378 }
379 /* Subtract MINSC from S to prevent overflow */
380 i__1 = *ltau;
381 for (i__ = 1; i__ <= i__1; ++i__) {
382 s[i__ - 1] -= minsc;
383 }
384 maxsc -= minsc;
385 /* Use higher octave pitch if significant null there */
386 j = 0;
387 for (i__ = 20; i__ <= 40; i__ += 10) {
388 if (*midx > i__) {
389 if (s[*midx - i__ - 1] < maxsc / 4) {
390 j = i__;
391 }
392 }
393 }
394 *midx -= j;
395 /* TRACE: look back two frames to find minimum cost pitch estimate */
396 j = *ipoint;
397 *pitch = *midx;
398 for (i__ = 1; i__ <= 2; ++i__) {
399 j = j % 2 + 1;
400 *pitch = p[*pitch + j * 60 - 61];
401 path[i__ - 1] = *pitch;
402 }
403
404 /* The following statement subtracts one from IPOINT, mod DEPTH. I
405 */
406 /* think the author chose to add DEPTH-1, instead of subtracting 1,
407 */
408 /* because then it will work even if MOD doesn't work as desired on
409 */
410 /* negative arguments. */
411
412 *ipoint = (*ipoint + 1) % 2;
413 return 0;
414 } /* dyptrk_ */
415