1 /*
2
3 * Revision 1.2 1996/08/20 20:42:59 jaf
4 * Removed all static local variables that were SAVE'd in the Fortran
5 * code, and put them in struct lpc10_decoder_state that is passed as an
6 * argument.
7 *
8 * Removed init function, since all initialization is now done in
9 * init_lpc10_decoder_state().
10 *
11 * Revision 1.1 1996/08/19 22:30:33 jaf
12 * Initial revision
13 *
14
15 */
16
17 /* -- translated by f2c (version 19951025).
18 You must link the resulting object file with the libraries:
19 -lf2c -lm (in that order)
20 */
21
22 #include "f2c.h"
23
24 extern int synths_(integer *voice, integer *pitch, real *rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st);
25
26 /* Common Block Declarations */
27
28 extern struct {
29 integer order, lframe;
30 logical corrp;
31 } contrl_;
32
33 #define contrl_1 contrl_
34
35 /* Table of constant values */
36
37 static real c_b2 = .7f;
38
39 /* ***************************************************************** */
40
41 /* SYNTHS Version 54 */
42
43 /*
44 * Revision 1.2 1996/08/20 20:42:59 jaf
45 * Removed all static local variables that were SAVE'd in the Fortran
46 * code, and put them in struct lpc10_decoder_state that is passed as an
47 * argument.
48 *
49 * Removed init function, since all initialization is now done in
50 * init_lpc10_decoder_state().
51 *
52 * Revision 1.1 1996/08/19 22:30:33 jaf
53 * Initial revision
54 * */
55 /* Revision 1.5 1996/03/26 19:31:58 jaf */
56 /* Commented out trace statements. */
57
58 /* Revision 1.4 1996/03/25 19:41:01 jaf */
59 /* Changed so that MAXFRM samples are always returned in the output array */
60 /* SPEECH. */
61
62 /* This required delaying the returned samples by MAXFRM sample times, */
63 /* and remembering any "left over" samples returned by PITSYN from one */
64 /* call of SYNTHS to the next. */
65
66 /* Changed size of SPEECH from 2*MAXFRM to MAXFRM. Removed local */
67 /* variable SOUT. Added local state variables BUF and BUFLEN. */
68
69 /* Revision 1.3 1996/03/25 19:20:10 jaf */
70 /* Added comments about the range of possible return values for argument */
71 /* K, and increased the size of the arrays filled in by PITSYN from 11 to */
72 /* 16, as has been already done inside of PITSYN. */
73
74 /* Revision 1.2 1996/03/22 00:18:18 jaf */
75 /* Added comments explaining meanings of input and output parameters, and */
76 /* indicating which array indices can be read or written. */
77
78 /* Added entry INITSYNTHS, which does nothing except call the */
79 /* corresponding initialization entries for subroutines PITSYN, BSYNZ, */
80 /* and DEEMP. */
81
82 /* Revision 1.1 1996/02/07 14:49:44 jaf */
83 /* Initial revision */
84
85
86 /* ***************************************************************** */
87
88 /* The note below is from the distributed version of the LPC10 coder. */
89 /* The version of the code below has been modified so that SYNTHS always */
90 /* has a constant frame length output of MAXFRM. */
91
92 /* Also, BSYNZ and DEEMP need not be modified to work on variable */
93 /* positions within an array. It is only necessary to pass the first */
94 /* index desired as the array argument. What actually gets passed is the */
95 /* address of that array position, which the subroutine treats as the */
96 /* first index of the array. */
97
98 /* This technique is used in subroutine ANALYS when calling PREEMP, so it */
99 /* appears that multiple people wrote different parts of this LPC10 code, */
100 /* and that they didn't necessarily have equivalent knowledge of Fortran */
101 /* (not surprising). */
102
103 /* NOTE: There is excessive buffering here, BSYNZ and DEEMP should be */
104 /* changed to operate on variable positions within SOUT. Also, */
105 /* the output length parameter is bogus, and PITSYN should be */
106 /* rewritten to allow a constant frame length output. */
107
108 /* Input: */
109 /* VOICE - Half frame voicing decisions */
110 /* Indices 1 through 2 read. */
111 /* Input/Output: */
112 /* PITCH - Pitch */
113 /* PITCH is restricted to range 20 to 156, inclusive, */
114 /* before calling subroutine PITSYN, and then PITSYN */
115 /* can modify it further under some conditions. */
116 /* RMS - Energy */
117 /* Only use is for debugging, and passed to PITSYN. */
118 /* See comments there for how it can be modified. */
119 /* RC - Reflection coefficients */
120 /* Indices 1 through ORDER restricted to range -.99 to .99, */
121 /* before calling subroutine PITSYN, and then PITSYN */
122 /* can modify it further under some conditions. */
123 /* Output: */
124 /* SPEECH - Synthesized speech samples. */
125 /* Indices 1 through the final value of K are written. */
126 /* K - Number of samples placed into array SPEECH. */
127 /* This is always MAXFRM. */
128
synths_(integer * voice,integer * pitch,real * rms,real * rc,real * speech,integer * k,struct lpc10_decoder_state * st)129 /* Subroutine */ int synths_(integer *voice, integer *pitch, real *
130 rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st)
131 {
132 /* Initialized data */
133
134 real *buf;
135 integer *buflen;
136
137 /* System generated locals */
138 integer i__1;
139 real r__1, r__2;
140
141 /* Local variables */
142 real rmsi[16];
143 integer nout, ivuv[16], i__, j;
144 extern /* Subroutine */ int deemp_(real *, integer *, struct lpc10_decoder_state *);
145 real ratio;
146 integer ipiti[16];
147 extern int bsynz_(real *, integer *,
148 integer *, real *, real *, real *, real *, struct lpc10_decoder_state *), irc2pc_(real *, real *
149 , integer *, real *, real *);
150 real g2pass;
151 real pc[10];
152 extern /* Subroutine */ int pitsyn_(integer *, integer *, integer *, real
153 *, real *, integer *, integer *, integer *, real *, real *,
154 integer *, real *, struct lpc10_decoder_state *);
155 real rci[160] /* was [10][16] */;
156
157 /* LPC Configuration parameters: */
158 /* Frame size, Prediction order, Pitch period */
159 /* Arguments */
160
161 /* LPC Processing control variables: */
162
163 /* *** Read-only: initialized in setup */
164
165 /* Files for Speech, Parameter, and Bitstream Input & Output, */
166 /* and message and debug outputs. */
167
168 /* Here are the only files which use these variables: */
169
170 /* lpcsim.f setup.f trans.f error.f vqsetup.f */
171
172 /* Many files which use fdebug are not listed, since it is only used in */
173 /* those other files conditionally, to print trace statements. */
174 /* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
175 /* LPC order, Frame size, Quantization rate, Bits per frame, */
176 /* Error correction */
177 /* Subroutine SETUP is the only place where order is assigned a value, */
178 /* and that value is 10. It could increase efficiency 1% or so to */
179 /* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
180 */
181 /* a variable in a COMMON block, since it is used in many places in the */
182 /* core of the coding and decoding routines. Actually, I take that back.
183 */
184 /* At least when compiling with f2c, the upper bound of DO loops is */
185 /* stored in a local variable before the DO loop begins, and then that is
186 */
187 /* compared against on each iteration. */
188 /* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
189 /* Similarly for quant, which is given a value of 2400 in SETUP. quant */
190 /* is used in only a few places, and never in the core coding and */
191 /* decoding routines, so it could be eliminated entirely. */
192 /* nbits is similar to quant, and is given a value of 54 in SETUP. */
193 /* corrp is given a value of .TRUE. in SETUP, and is only used in the */
194 /* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
195 /* coder significantly whether it is .TRUE. or .FALSE., or whether it is
196 */
197 /* a constant or a variable, since it is only examined once per frame. */
198 /* Leaving it as a variable that is set to .TRUE. seems like a good */
199 /* idea, since it does enable some error-correction capability for */
200 /* unvoiced frames, with no change in the coding rate, and no noticeable
201 */
202 /* quality difference in the decoded speech. */
203 /* integer quant, nbits */
204 /* *** Read/write: variables for debugging, not needed for LPC algorithm
205 */
206
207 /* Current frame, Unstable frames, Output clip count, Max onset buffer,
208 */
209 /* Debug listing detail level, Line count on listing page */
210
211 /* nframe is not needed for an embedded LPC10 at all. */
212 /* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
213 /* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
214 /* an application, I would recommend removing the call to ERROR in RCCHK,
215 */
216 /* and remove ERROR and nunsfm completely. */
217 /* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
218 */
219 /* sread.f. When LPC10 is embedded into an application, one might want */
220 /* to cause it to be incremented in a routine that takes the output of */
221 /* SYNTHS and sends it to an audio device. It could be optionally */
222 /* displayed, for those that might want to know what it is. */
223 /* maxosp is never initialized to 0 in SETUP, although it probably should
224 */
225 /* be, and it is updated in subroutine ANALYS. I doubt that its value */
226 /* would be of much interest to an application in which LPC10 is */
227 /* embedded. */
228 /* listl and lincnt are not needed for an embedded LPC10 at all. */
229 /* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
230 /* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
231 /* common /contrl/ quant, nbits */
232 /* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
233 /* Parameters/constants */
234 /* Local variables that need not be saved */
235 /* Local state */
236 /* BUF is a buffer of speech samples that would have been returned
237 */
238 /* by the older version of SYNTHS, but the newer version doesn't, */
239 /* so that the newer version can always return MAXFRM samples on */
240 /* every call. This has the effect of delaying the return of */
241 /* samples for one additional frame time. */
242
243 /* Indices 1 through BUFLEN contain samples that are left over from
244 */
245 /* the last call to SYNTHS. Given the way that PITSYN works, */
246 /* BUFLEN should always be in the range MAXFRM-MAXPIT+1 through */
247 /* MAXFRM, inclusive, after a call to SYNTHS is complete. */
248
249 /* On the first call to SYNTHS (or the first call after */
250 /* reinitializing with the entry INITSYNTHS), BUFLEN is MAXFRM, and
251 */
252 /* a frame of silence is always returned. */
253 /* Parameter adjustments */
254 if (voice) {
255 --voice;
256 }
257 if (rc) {
258 --rc;
259 }
260 if (speech) {
261 --speech;
262 }
263
264 /* Function Body */
265 buf = &(st->buf[0]);
266 buflen = &(st->buflen);
267
268 /* Computing MAX */
269 i__1 = min(*pitch,156);
270 *pitch = max(i__1,20);
271 i__1 = contrl_1.order;
272 for (i__ = 1; i__ <= i__1; ++i__) {
273 /* Computing MAX */
274 /* Computing MIN */
275 r__2 = rc[i__];
276 r__1 = min(r__2,.99f);
277 rc[i__] = max(r__1,-.99f);
278 }
279 pitsyn_(&contrl_1.order, &voice[1], pitch, rms, &rc[1], &contrl_1.lframe,
280 ivuv, ipiti, rmsi, rci, &nout, &ratio, st);
281 if (nout > 0) {
282 i__1 = nout;
283 for (j = 1; j <= i__1; ++j) {
284
285 /* Add synthesized speech for pitch period J to the en
286 d of */
287 /* BUF. */
288
289 irc2pc_(&rci[j * 10 - 10], pc, &contrl_1.order, &c_b2, &g2pass);
290 bsynz_(pc, &ipiti[j - 1], &ivuv[j - 1], &buf[*buflen], &rmsi[j - 1]
291 , &ratio, &g2pass, st);
292 deemp_(&buf[*buflen], &ipiti[j - 1], st);
293 *buflen += ipiti[j - 1];
294 }
295
296 /* Copy first MAXFRM samples from BUF to output array SPEECH
297 */
298 /* (scaling them), and then remove them from the beginning of
299 */
300 /* BUF. */
301
302 for (i__ = 1; i__ <= 180; ++i__) {
303 speech[i__] = buf[i__ - 1] / 4096.f;
304 }
305 *k = 180;
306 *buflen += -180;
307 i__1 = *buflen;
308 for (i__ = 1; i__ <= i__1; ++i__) {
309 buf[i__ - 1] = buf[i__ + 179];
310 }
311 }
312 return 0;
313 } /* synths_ */
314