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alaw.h File Reference

Detailed Description

A-Law to Signed linear conversion.

Definition in file alaw.h.

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Go to the source code of this file.

Defines

#define AST_ALAW(a)   (__ast_alaw[(int)(a)])
#define AST_LIN2A(a)   (__ast_lin2a[((unsigned short)(a)) >> 3])

Functions

void ast_alaw_init (void)

Variables

short __ast_alaw [256]
unsigned char __ast_lin2a [8192]

Define Documentation

#define AST_ALAW (  a   )     (__ast_alaw[(int)(a)])
 

Definition at line 41 of file alaw.h.

Referenced by ast_dsp_process(), fill_rxgain(), and fill_txgain().

#define AST_LIN2A (  a   )     (__ast_lin2a[((unsigned short)(a)) >> 3])
 

Definition at line 40 of file alaw.h.

Referenced by fill_rxgain(), and fill_txgain().

Function Documentation

void ast_alaw_init (  void   ) 
 

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

Definition at line 80 of file alaw.c.

References alaw2linear().

00081 {
00082    int i;
00083    /* 
00084     *  Set up mu-law conversion table
00085     */
00086    for (i = 0; i < 256; i++) {
00087            __ast_alaw[i] = alaw2linear(i);
00088    }
00089    /* set up the reverse (mu-law) conversion table */
00090    for (i = -32768; i < 32768; i++) {
00091       __ast_lin2a[((unsigned short)i) >> 3] = linear2alaw(i);
00092    }
00093 
00094 }

Variable Documentation

short __ast_alaw[256]
 

help

Definition at line 78 of file alaw.c.

unsigned char __ast_lin2a[8192]
 

Definition at line 77 of file alaw.c.

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