ref: 2024869a595118d686682b38386c594c717ea5bd
dir: /lpc10/synths.c/
/*
* Revision 1.2 1996/08/20 20:42:59 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:33 jaf
* Initial revision
*
*/
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
extern int synths_(integer *voice, integer *pitch, real *rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st);
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* Table of constant values */
static real c_b2 = .7f;
/* ***************************************************************** */
/* SYNTHS Version 54 */
/*
* Revision 1.2 1996/08/20 20:42:59 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:33 jaf
* Initial revision
* */
/* Revision 1.5 1996/03/26 19:31:58 jaf */
/* Commented out trace statements. */
/* Revision 1.4 1996/03/25 19:41:01 jaf */
/* Changed so that MAXFRM samples are always returned in the output array */
/* SPEECH. */
/* This required delaying the returned samples by MAXFRM sample times, */
/* and remembering any "left over" samples returned by PITSYN from one */
/* call of SYNTHS to the next. */
/* Changed size of SPEECH from 2*MAXFRM to MAXFRM. Removed local */
/* variable SOUT. Added local state variables BUF and BUFLEN. */
/* Revision 1.3 1996/03/25 19:20:10 jaf */
/* Added comments about the range of possible return values for argument */
/* K, and increased the size of the arrays filled in by PITSYN from 11 to */
/* 16, as has been already done inside of PITSYN. */
/* Revision 1.2 1996/03/22 00:18:18 jaf */
/* Added comments explaining meanings of input and output parameters, and */
/* indicating which array indices can be read or written. */
/* Added entry INITSYNTHS, which does nothing except call the */
/* corresponding initialization entries for subroutines PITSYN, BSYNZ, */
/* and DEEMP. */
/* Revision 1.1 1996/02/07 14:49:44 jaf */
/* Initial revision */
/* ***************************************************************** */
/* The note below is from the distributed version of the LPC10 coder. */
/* The version of the code below has been modified so that SYNTHS always */
/* has a constant frame length output of MAXFRM. */
/* Also, BSYNZ and DEEMP need not be modified to work on variable */
/* positions within an array. It is only necessary to pass the first */
/* index desired as the array argument. What actually gets passed is the */
/* address of that array position, which the subroutine treats as the */
/* first index of the array. */
/* This technique is used in subroutine ANALYS when calling PREEMP, so it */
/* appears that multiple people wrote different parts of this LPC10 code, */
/* and that they didn't necessarily have equivalent knowledge of Fortran */
/* (not surprising). */
/* NOTE: There is excessive buffering here, BSYNZ and DEEMP should be */
/* changed to operate on variable positions within SOUT. Also, */
/* the output length parameter is bogus, and PITSYN should be */
/* rewritten to allow a constant frame length output. */
/* Input: */
/* VOICE - Half frame voicing decisions */
/* Indices 1 through 2 read. */
/* Input/Output: */
/* PITCH - Pitch */
/* PITCH is restricted to range 20 to 156, inclusive, */
/* before calling subroutine PITSYN, and then PITSYN */
/* can modify it further under some conditions. */
/* RMS - Energy */
/* Only use is for debugging, and passed to PITSYN. */
/* See comments there for how it can be modified. */
/* RC - Reflection coefficients */
/* Indices 1 through ORDER restricted to range -.99 to .99, */
/* before calling subroutine PITSYN, and then PITSYN */
/* can modify it further under some conditions. */
/* Output: */
/* SPEECH - Synthesized speech samples. */
/* Indices 1 through the final value of K are written. */
/* K - Number of samples placed into array SPEECH. */
/* This is always MAXFRM. */
/* Subroutine */ int synths_(integer *voice, integer *pitch, real *
rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st)
{
/* Initialized data */
real *buf;
integer *buflen;
/* System generated locals */
integer i__1;
real r__1, r__2;
/* Local variables */
real rmsi[16];
integer nout, ivuv[16], i__, j;
extern /* Subroutine */ int deemp_(real *, integer *, struct lpc10_decoder_state *);
real ratio;
integer ipiti[16];
extern int bsynz_(real *, integer *,
integer *, real *, real *, real *, real *, struct lpc10_decoder_state *), irc2pc_(real *, real *
, integer *, real *, real *);
real g2pass;
real pc[10];
extern /* Subroutine */ int pitsyn_(integer *, integer *, integer *, real
*, real *, integer *, integer *, integer *, real *, real *,
integer *, real *, struct lpc10_decoder_state *);
real rci[160] /* was [10][16] */;
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Parameters/constants */
/* Local variables that need not be saved */
/* Local state */
/* BUF is a buffer of speech samples that would have been returned
*/
/* by the older version of SYNTHS, but the newer version doesn't, */
/* so that the newer version can always return MAXFRM samples on */
/* every call. This has the effect of delaying the return of */
/* samples for one additional frame time. */
/* Indices 1 through BUFLEN contain samples that are left over from
*/
/* the last call to SYNTHS. Given the way that PITSYN works, */
/* BUFLEN should always be in the range MAXFRM-MAXPIT+1 through */
/* MAXFRM, inclusive, after a call to SYNTHS is complete. */
/* On the first call to SYNTHS (or the first call after */
/* reinitializing with the entry INITSYNTHS), BUFLEN is MAXFRM, and
*/
/* a frame of silence is always returned. */
/* Parameter adjustments */
if (voice) {
--voice;
}
if (rc) {
--rc;
}
if (speech) {
--speech;
}
/* Function Body */
buf = &(st->buf[0]);
buflen = &(st->buflen);
/* Computing MAX */
i__1 = min(*pitch,156);
*pitch = max(i__1,20);
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
/* Computing MAX */
/* Computing MIN */
r__2 = rc[i__];
r__1 = min(r__2,.99f);
rc[i__] = max(r__1,-.99f);
}
pitsyn_(&contrl_1.order, &voice[1], pitch, rms, &rc[1], &contrl_1.lframe,
ivuv, ipiti, rmsi, rci, &nout, &ratio, st);
if (nout > 0) {
i__1 = nout;
for (j = 1; j <= i__1; ++j) {
/* Add synthesized speech for pitch period J to the en
d of */
/* BUF. */
irc2pc_(&rci[j * 10 - 10], pc, &contrl_1.order, &c_b2, &g2pass);
bsynz_(pc, &ipiti[j - 1], &ivuv[j - 1], &buf[*buflen], &rmsi[j - 1]
, &ratio, &g2pass, st);
deemp_(&buf[*buflen], &ipiti[j - 1], st);
*buflen += ipiti[j - 1];
}
/* Copy first MAXFRM samples from BUF to output array SPEECH
*/
/* (scaling them), and then remove them from the beginning of
*/
/* BUF. */
for (i__ = 1; i__ <= 180; ++i__) {
speech[i__] = buf[i__ - 1] / 4096.f;
}
*k = 180;
*buflen += -180;
i__1 = *buflen;
for (i__ = 1; i__ <= i__1; ++i__) {
buf[i__ - 1] = buf[i__ + 179];
}
}
return 0;
} /* synths_ */