inital checkin of spandsp from http://www.soft-switch.org/downloads/snapshots/spandsp/spandsp-20080829.tar.gz

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9425 d0543943-73ff-0310-b7d9-9358b9ac24b2
2025-08-13 17:38:59 +00:00 · 2008-09-03 19:02:00 +00:00
parent c72e353b55
commit 1e177dbd2b
342 changed files with 164474 additions and 0 deletions
--- a/libs/spandsp/src/lpc10_encdecs.h
+++ b/libs/spandsp/src/lpc10_encdecs.h
@@ -0,0 +1,107 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * lpc10_encdecs.h - LPC10 low bit rate speech codec.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2006 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: lpc10_encdecs.h,v 1.11 2008/04/17 14:26:56 steveu Exp $
+ */
+
+#define LPC10_ORDER     10
+
+#if !defined(min)
+#define min(a,b) ((a) <= (b) ? (a) : (b))
+#endif
+#if !defined(max)
+#define max(a,b) ((a) >= (b) ? (a) : (b))
+#endif
+
+void lpc10_placea(int32_t *ipitch,
+                  int32_t voibuf[4][2],
+                  int32_t *obound,
+                  int32_t af,
+                  int32_t vwin[3][2],
+                  int32_t awin[3][2],
+                  int32_t ewin[3][2], 
+                  int32_t lframe,
+                  int32_t maxwin);
+
+void lpc10_placev(int32_t *osbuf,
+                  int32_t *osptr,
+                  int32_t oslen, 
+                  int32_t *obound,
+                  int32_t vwin[3][2],
+                  int32_t af,
+                  int32_t lframe,
+                  int32_t minwin,
+                  int32_t maxwin,
+                  int32_t dvwinl,
+                  int32_t dvwinh);
+
+void lpc10_voicing(lpc10_encode_state_t *st,
+                   int32_t *vwin,
+                   float *inbuf,
+                   float *lpbuf,
+                   const int32_t buflim[],
+                   int32_t half,
+                   float *minamd,
+                   float *maxamd, 
+	               int32_t *mintau,
+                   float *ivrc,
+                   int32_t *obound);
+
+void lpc10_analyse(lpc10_encode_state_t *st, float *speech, int32_t *voice, int32_t *pitch, float *rms, float rc[]);
+
+static __inline__ int32_t pow_ii(int32_t x, int32_t n)
+{
+    int32_t pow;
+    uint32_t u;
+
+    if (n <= 0)
+    {
+        if (n == 0  ||  x == 1)
+            return 1;
+        if (x != -1)
+            return (x == 0)  ?  1/x  :  0;
+        n = -n;
+    }
+    u = n;
+    for (pow = 1;  ;  )
+    {
+        if ((u & 1))
+            pow *= x;
+        if ((u >>= 1) == 0)
+            break;
+        x *= x;
+    }
+    return pow;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ float r_sign(float a, float b)
+{
+    float x;
+
+    x = fabsf(a);
+    return (b >= 0.0f)  ?  x  :  -x;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/