synths.c,v

lpc10-15为美军2400bps语音压缩标准的C语音源代码。

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1.2
date	96.08.20.20.42.59;	author jaf;	state Exp;
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1.1
date	96.08.19.22.30.33;	author jaf;	state Exp;
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desc
@@


1.2
log
@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().
@
text
@/*

$Log: synths.c,v $
 * Revision 1.1  1996/08/19  22:30:33  jaf
 * Initial revision
 *

*/

#ifdef P_R_O_T_O_T_Y_P_E_S
extern int synths_(integer *voice, integer *pitch, real *rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st);
/* comlen contrl_ 12 */
/*:ref: pitsyn_ 14 12 4 4 4 6 6 4 4 4 6 6 4 6 */
/*:ref: irc2pc_ 14 5 6 6 4 6 6 */
/*:ref: bsynz_ 14 7 6 4 4 6 6 6 6 */
/*:ref: deemp_ 14 2 6 4 */
/*:ref: initpitsyn_ 14 0 */
/*:ref: initbsynz_ 14 0 */
/*:ref: initdeemp_ 14 0 */
#endif

/*  -- translated by f2c (version 19951025).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include "f2c.h"

/* 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 */

/* $Log: synths.c,v $
 * 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 /* Subroutine */ 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] */;

/* $Log: synths.c,v $
 * Revision 1.1  1996/08/19  22:30:33  jaf
 * Initial revision
 * */
/* Revision 1.3  1996/03/29  22:03:47  jaf */
/* Removed definitions for any constants that were no longer used. */

/* Revision 1.2  1996/03/26  19:34:33  jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */

/* Revision 1.1  1996/02/07  14:43:51  jaf */
/* Initial revision */

/*   LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/*       Arguments */
/* $Log: synths.c,v $
 * Revision 1.1  1996/08/19  22:30:33  jaf
 * Initial revision
 * */
/* Revision 1.3  1996/03/29  22:05:55  jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */

/* Revision 1.2  1996/03/26  19:34:50  jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */

/* Revision 1.1  1996/02/07  14:44:09  jaf */
/* Initial revision */

/*   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 */