125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
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/*
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$Log$
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Revision 1.15 2004/06/26 03:50:14 markster
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Merge source cleanups (bug #1911)
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Revision 1.14 2003/02/12 13:59:15 matteo
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mer feb 12 14:56:57 CET 2003
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Revision 1.1.1.1 2003/02/12 13:59:15 matteo
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mer feb 12 14:56:57 CET 2003
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Revision 1.2 2000/01/05 08:20:39 markster
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Some OSS fixes and a few lpc changes to make it actually work
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* Revision 1.2 1996/08/20 20:41:32 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:30:49 jaf
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* Initial revision
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*
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*/
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/* -- translated by f2c (version 19951025).
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You must link the resulting object file with the libraries:
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-lf2c -lm (in that order)
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*/
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#include "f2c.h"
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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern integer random_(struct lpc10_decoder_state *st);
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#endif
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/* ********************************************************************** */
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/* RANDOM Version 49 */
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/* $Log$
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* Revision 1.15 2004/06/26 03:50:14 markster
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* Merge source cleanups (bug #1911)
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*
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* Revision 1.14 2003/02/12 13:59:15 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.1.1.1 2003/02/12 13:59:15 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.2 2000/01/05 08:20:39 markster
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* Some OSS fixes and a few lpc changes to make it actually work
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*
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* Revision 1.2 1996/08/20 20:41:32 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:30:49 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/20 16:13:54 jaf */
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/* Rearranged comments a little bit, and added comments explaining that */
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/* even though there is local state here, there is no need to create an */
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/* ENTRY for reinitializing it. */
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/* Revision 1.2 1996/03/14 22:25:29 jaf */
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/* Just rearranged the comments and local variable declarations a bit. */
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/* Revision 1.1 1996/02/07 14:49:01 jaf */
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/* Initial revision */
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/* ********************************************************************* */
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/* Pseudo random number generator based on Knuth, Vol 2, p. 27. */
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/* Function Return: */
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/* RANDOM - Integer variable, uniformly distributed over -32768 to 32767 */
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/* This subroutine maintains local state from one call to the next. */
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/* In the context of the LPC10 coder, there is no reason to reinitialize */
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/* this local state when switching between audio streams, because its */
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/* results are only used to generate noise for unvoiced frames. */
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integer random_(struct lpc10_decoder_state *st)
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{
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/* Initialized data */
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integer *j;
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integer *k;
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shortint *y;
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/* System generated locals */
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integer ret_val;
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/* Parameters/constants */
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/* Local state */
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/* The following is a 16 bit 2's complement addition, */
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/* with overflow checking disabled */
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j = &(st->j);
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k = &(st->k);
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y = &(st->y[0]);
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y[*k - 1] += y[*j - 1];
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ret_val = y[*k - 1];
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--(*k);
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if (*k <= 0) {
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*k = 5;
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}
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--(*j);
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if (*j <= 0) {
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*j = 5;
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}
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return ret_val;
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} /* random_ */
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