--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intercom/g726/g726.h	Fri Jun 25 09:57:52 2010 +0200
@@ -0,0 +1,129 @@
+/*
+  ============================================================================
+   File: G726.H                                        28-Feb-1991 (18:00:00)
+  ============================================================================
+
+                            UGST/ITU-T G726 MODULE
+
+                          GLOBAL FUNCTION PROTOTYPES
+
+   History:
+   28.Feb.92	v1.0	First version <simao@cpqd.br>
+   06.May.94    v2.0    Smart prototypes that work with many compilers <simao> 
+  ============================================================================
+*/
+#ifndef G726_defined
+#define G726_defined 200
+
+/* Smart function prototypes: for [ag]cc, VaxC, and [tb]cc */
+#if !defined(ARGS)
+#if (defined(__STDC__) || defined(VMS) || defined(__DECC)  || defined(MSDOS) || defined(__MSDOS__)) || defined (__CYGWIN__) || defined (_MSC_VER)
+#define ARGS(s) s
+#else
+#define ARGS(s) ()
+#endif
+#endif
+
+
+/* State for G726 encoder and decoder */
+typedef struct {
+  short sr0, sr1;               /* Reconstructed signal with delays 0 and 1 */
+  short a1r, a2r;               /* Triggered 2nd order predictor coeffs. */
+  short b1r;                    /* Triggered 6nd order predictor coeffs */
+  short b2r;
+  short b3r;
+  short b4r;
+  short b5r;
+  short b6r;
+  short dq5;                    /* Quantized difference signal with delays 5
+                                 * to 0 */
+  short dq4;
+  short dq3;
+  short dq2;
+  short dq1;
+  short dq0;
+  short dmsp;                   /* Short term average of the F(I) sequence */
+  short dmlp;                   /* Long term average of the F(I) sequence */
+  short apr;                    /* Triggered unlimited speed control
+                                 * parameter */
+  short yup;                    /* Fast quantizer scale factor */
+  short tdr;                    /* Triggered tone detector */
+  short pk0, pk1;               /* sign of dq+sez with delays 0 and 1 */
+  long ylp;                     /* Slow quantizer scale factor */
+} G726_state;
+
+#ifdef VAXC
+#  define SHORT short
+#else
+#  define SHORT int
+#endif
+
+/* Function prototypes */
+void G726_encode ARGS((unsigned char *inp_buf, short *out_buf, long smpno,
+    char *law, SHORT rate, SHORT r, G726_state * state));
+void G726_decode ARGS((short *inp_buf, unsigned char *out_buf, long smpno,
+    char *law, SHORT rate, SHORT r, G726_state * state));
+void G726_expand ARGS((short *s, char *law, short *sl));
+void G726_subta ARGS((short *sl, short *se, short *d));
+void G726_log ARGS((short *d, short *dl, short *ds));
+void G726_quan ARGS((SHORT rate, short *dln, short *ds, short *i));
+void G726_subtb ARGS((short *dl, short *y, short *dln));
+void G726_adda ARGS((short *dqln, short *y, short *dql));
+void G726_antilog ARGS((short *dql, short *dqs, short *dq));
+void G726_reconst ARGS((SHORT rate, short *i, short *dqln, short *dqs));
+void G726_delaya ARGS((short *r, short *x, short *y));
+void G726_delayb ARGS((short *r, short *x, short *y));
+void G726_delayc ARGS((short *r, long *x, long *y));
+void G726_delayd ARGS((short *r, short *x, short *y));
+void G726_filtd ARGS((short *wi, short *y, short *yut));
+void G726_filte ARGS((short *yup, long *yl, long *ylp));
+void G726_functw ARGS((SHORT rate, short *i, short *wi));
+void G726_limb ARGS((short *yut, short *yup));
+void G726_mix ARGS((short *al, short *yu, long *yl, short *y));
+void G726_filta ARGS((short *fi, short *dms, short *dmsp));
+void G726_filtb ARGS((short *fi, short *dml, short *dmlp));
+void G726_filtc ARGS((short *ax, short *ap, short *app));
+void G726_functf ARGS((SHORT rate, short *i, short *fi));
+void G726_lima ARGS((short *ap, short *al));
+void G726_subtc ARGS((short *dmsp, short *dmlp, short *tdp, short *y,
+    short *ax));
+void G726_triga ARGS((short *tr, short *app, short *apr));
+void G726_accum ARGS((short *wa1, short *wa2, short *wb1, short *wb2,
+    short *wb3, short *wb4, short *wb5, short *wb6, short *se,
+    short *sez));
+void G726_addb ARGS((short *dq, short *se, short *sr));
+void G726_addc ARGS((short *dq, short *sez, short *pk0, short *sigpk));
+void G726_floata ARGS((short *dq, short *dq0));
+void G726_floatb ARGS((short *sr, short *sr0));
+void G726_fmult ARGS((short *An, short *SRn, short *WAn));
+void G726_limc ARGS((short *a2t, short *a2p));
+void G726_limd ARGS((short *a1t, short *a2p, short *a1p));
+void G726_trigb ARGS((short *tr, short *ap, short *ar));
+void G726_upa1 ARGS((short *pk0, short *pk1, short *a1, short *sigpk,
+    short *a1t));
+void G726_upa2 ARGS((short *pk0, short *pk1, short *pk2, short *a2,
+    short *a1, short *sigpk, short *a2t));
+void G726_upb ARGS((SHORT rate, short *u, short *b, short *dq,
+    short *bp));
+void G726_xor ARGS((short *dqn, short *dq, short *u));
+void G726_tone ARGS((short *a2p, short *tdp));
+void G726_trans ARGS((short *td, long *yl, short *dq, short *tr));
+void G726_compress ARGS((short *sr, char *law, short *sp));
+void G726_sync ARGS((SHORT rate, short *i, short *sp, short *dlnx,
+    short *dsx, char *law, short *sd));
+
+/* Definitions for better user interface (?!) */
+#ifndef IS_LOG
+#  define IS_LOG   0
+#endif
+
+#ifndef IS_LIN
+#  define IS_LIN   1
+#endif
+
+#ifndef IS_ADPCM
+#  define IS_ADPCM 2
+#endif
+
+#endif
+/* .......................... End of G726.H ........................... */