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- /*
- $Log$
- Revision 1.15 2004/06/26 03:50:14 markster
- Merge source cleanups (bug #1911)
- Revision 1.14 2003/02/12 13:59:15 matteo
- mer feb 12 14:56:57 CET 2003
- Revision 1.1.1.1 2003/02/12 13:59:15 matteo
- mer feb 12 14:56:57 CET 2003
- Revision 1.2 2000/01/05 08:20:39 markster
- Some OSS fixes and a few lpc changes to make it actually work
- * Revision 1.2 1996/08/20 20:30:11 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_encoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_encoder_state().
- *
- * Changed name of function from lpcenc_ to lpc10_encode, simply to make
- * all lpc10 functions have more consistent naming with each other.
- *
- * Revision 1.1 1996/08/19 22:31:48 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"
- #ifdef P_R_O_T_O_T_Y_P_E_S
- extern int lpcdec_(integer *bits, real *speech);
- extern int initlpcdec_(void);
- /* comlen contrl_ 12 */
- /*:ref: chanrd_ 14 5 4 4 4 4 4 */
- /*:ref: decode_ 14 7 4 4 4 4 4 6 6 */
- /*:ref: synths_ 14 6 4 4 6 6 6 4 */
- /*:ref: initdecode_ 14 0 */
- /*:ref: initsynths_ 14 0 */
- #endif
- /* Common Block Declarations */
- extern struct {
- integer order, lframe;
- logical corrp;
- } contrl_;
- #define contrl_1 contrl_
- /* Table of constant values */
- static integer c__10 = 10;
- /* ***************************************************************** */
- /* $Log$
- * Revision 1.15 2004/06/26 03:50:14 markster
- * Merge source cleanups (bug #1911)
- *
- * Revision 1.14 2003/02/12 13:59:15 matteo
- * mer feb 12 14:56:57 CET 2003
- *
- * Revision 1.1.1.1 2003/02/12 13:59:15 matteo
- * mer feb 12 14:56:57 CET 2003
- *
- * Revision 1.2 2000/01/05 08:20:39 markster
- * Some OSS fixes and a few lpc changes to make it actually work
- *
- * Revision 1.2 1996/08/20 20:30:11 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_encoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_encoder_state().
- *
- * Changed name of function from lpcenc_ to lpc10_encode, simply to make
- * all lpc10 functions have more consistent naming with each other.
- *
- * Revision 1.1 1996/08/19 22:31:48 jaf
- * Initial revision
- * */
- /* Revision 1.1 1996/03/28 00:03:00 jaf */
- /* Initial revision */
- /* ***************************************************************** */
- /* Decode 54 bits to one frame of 180 speech samples. */
- /* Input: */
- /* BITS - 54 encoded bits, stored 1 per array element. */
- /* Indices 1 through 53 read (SYNC bit ignored). */
- /* Output: */
- /* SPEECH - Speech encoded as real values in the range [-1,+1]. */
- /* Indices 1 through 180 written. */
- /* This subroutine maintains local state from one call to the next. If */
- /* you want to switch to using a new audio stream for this filter, or */
- /* reinitialize its state for any other reason, call the ENTRY */
- /* INITLPCDEC. */
- /* Subroutine */ int lpc10_decode(integer *bits, real *speech,
- struct lpc10_decoder_state *st)
- {
- integer irms, voice[2], pitch, ipitv;
- extern /* Subroutine */ int decode_(integer *, integer *, integer *,
- integer *, integer *, real *, real *, struct lpc10_decoder_state *);
- real rc[10];
- extern /* Subroutine */ int chanrd_(integer *, integer *, integer *,
- integer *, integer *), synths_(integer *,
- integer *, real *, real *, real *, integer *,
- struct lpc10_decoder_state *);
- integer irc[10], len;
- real rms;
- /* $Log$
- * Revision 1.15 2004/06/26 03:50:14 markster
- * Merge source cleanups (bug #1911)
- *
- * Revision 1.14 2003/02/12 13:59:15 matteo
- * mer feb 12 14:56:57 CET 2003
- *
- * Revision 1.1.1.1 2003/02/12 13:59:15 matteo
- * mer feb 12 14:56:57 CET 2003
- *
- * Revision 1.2 2000/01/05 08:20:39 markster
- * Some OSS fixes and a few lpc changes to make it actually work
- *
- * Revision 1.2 1996/08/20 20:30:11 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_encoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_encoder_state().
- *
- * Changed name of function from lpcenc_ to lpc10_encode, simply to make
- * all lpc10 functions have more consistent naming with each other.
- *
- * Revision 1.1 1996/08/19 22:31:48 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 */
- /* $Log$
- * Revision 1.15 2004/06/26 03:50:14 markster
- * Merge source cleanups (bug #1911)
- *
- * Revision 1.14 2003/02/12 13:59:15 matteo
- * mer feb 12 14:56:57 CET 2003
- *
- * Revision 1.1.1.1 2003/02/12 13:59:15 matteo
- * mer feb 12 14:56:57 CET 2003
- *
- * Revision 1.2 2000/01/05 08:20:39 markster
- * Some OSS fixes and a few lpc changes to make it actually work
- *
- * Revision 1.2 1996/08/20 20:30:11 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_encoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_encoder_state().
- *
- * Changed name of function from lpcenc_ to lpc10_encode, simply to make
- * all lpc10 functions have more consistent naming with each other.
- *
- * Revision 1.1 1996/08/19 22:31:48 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 */
- /* 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 */
- /* Local variables that need not be saved */
- /* Uncoded speech parameters */
- /* Coded speech parameters */
- /* Others */
- /* Local state */
- /* None */
- /* Parameter adjustments */
- if (bits) {
- --bits;
- }
- if (speech) {
- --speech;
- }
- /* Function Body */
- chanrd_(&c__10, &ipitv, &irms, irc, &bits[1]);
- decode_(&ipitv, &irms, irc, voice, &pitch, &rms, rc, st);
- synths_(voice, &pitch, &rms, rc, &speech[1], &len, st);
- return 0;
- } /* lpcdec_ */
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