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alaw.c File Reference

#include <asterisk/alaw.h>

Go to the source code of this file.

Defines

#define AMI_MASK   0x55

Functions

void ast_alaw_init (void)
 Init the ulaw conversion stuff.

Variables

unsigned char __ast_lin2a [8192]
 converts signed linear to mulaw
short __ast_alaw [256]
 help

Define Documentation

#define AMI_MASK   0x55
 

Definition at line 16 of file alaw.c.

Function Documentation

void ast_alaw_init (  void   ) 
 

Init the ulaw conversion stuff.

To init the ulaw to slinear conversion stuff, this needs to be run.

Definition at line 68 of file alaw.c.

Referenced by main().

00069 {
00070    int i;
00071    /* 
00072     *  Set up mu-law conversion table
00073     */
00074    for(i = 0;i < 256;i++)
00075       {
00076            __ast_alaw[i] = alaw2linear(i);
00077       }
00078      /* set up the reverse (mu-law) conversion table */
00079    for(i = -32768; i < 32768; i++)
00080       {
00081       __ast_lin2a[((unsigned short)i) >> 3] = linear2alaw(i);
00082       }
00083 
00084 }

Variable Documentation

short __ast_alaw[256]
 

help

Definition at line 66 of file alaw.c.

unsigned char __ast_lin2a[8192]
 

converts signed linear to mulaw

Definition at line 65 of file alaw.c.

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