Merge changes from team/russell/codec_resample

This commit imports libresample for use in Asterisk.  It also adds a new codec
module, codec_resample.  This module uses libresample to re-sample signed linear
audio between 8 kHz and 16 kHz.

It also provides an alternative for converting between 16 kHz G.722 and 8 kHz
signed linear when using G.722, which will likely be useful as some people have
complained about volume issues when the current codec_g722 converts to 8 kHz 
signed linear.  But, to test this, you will have to disable the g722-to-slin and
g722-to-slin16 translators in codec_g722.c.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@95501 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 90 insertions, 0 deletions

diff --git a/main/libresample/src/resample_defs.h b/main/libresample/src/resample_defs.h
new file mode 100644
index 000000000..f1b10d432
--- /dev/null
+++ b/main/libresample/src/resample_defs.h
@@ -0,0 +1,90 @@
+/**********************************************************************
+
+  resample_defs.h
+
+  Real-time library interface by Dominic Mazzoni
+
+  Based on resample-1.7:
+    http://www-ccrma.stanford.edu/~jos/resample/
+
+  License: LGPL - see the file LICENSE.txt for more information
+
+**********************************************************************/
+
+#ifndef __RESAMPLE_DEFS__
+#define __RESAMPLE_DEFS__
+
+#if 0
+#if !defined(WIN32) && !defined(__CYGWIN__)
+#include "config.h"
+#endif
+#endif
+
+#define DEBUG 0
+
+#ifndef TRUE
+#define TRUE  1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef PI
+#define PI (3.14159265358979232846)
+#endif
+
+#ifndef PI2
+#define PI2 (6.28318530717958465692)
+#endif
+
+#define D2R (0.01745329348)          /* (2*pi)/360 */
+#define R2D (57.29577951)            /* 360/(2*pi) */
+
+#ifndef MAX
+#define MAX(x,y) ((x)>(y) ?(x):(y))
+#endif
+#ifndef MIN
+#define MIN(x,y) ((x)<(y) ?(x):(y))
+#endif
+
+#ifndef ABS
+#define ABS(x)   ((x)<0   ?(-(x)):(x))
+#endif
+
+#ifndef SGN
+#define SGN(x)   ((x)<0   ?(-1):((x)==0?(0):(1)))
+#endif
+
+#if HAVE_INTTYPES_H
+  #include <inttypes.h>
+  typedef char           BOOL;
+  typedef int32_t        WORD;
+  typedef uint32_t       UWORD;
+#else
+  typedef char           BOOL;
+  typedef int            WORD;
+  typedef unsigned int   UWORD;
+#endif
+
+#ifdef DEBUG
+#define INLINE
+#else
+#define INLINE inline
+#endif
+
+/* Accuracy */
+
+#define Npc 4096
+
+/* Function prototypes */
+
+int lrsSrcUp(float X[], float Y[], double factor, double *Time,
+             UWORD Nx, UWORD Nwing, float LpScl,
+             float Imp[], float ImpD[], BOOL Interp);
+
+int lrsSrcUD(float X[], float Y[], double factor, double *Time,
+             UWORD Nx, UWORD Nwing, float LpScl,
+             float Imp[], float ImpD[], BOOL Interp);
+
+#endif