Sat Aug 6 00:39:33 2011

Asterisk developer's documentation


alaw.h File Reference

A-Law to Signed linear conversion. More...

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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]


Detailed Description

A-Law to Signed linear conversion.

Definition in file alaw.h.


Define Documentation

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

Definition at line 41 of file alaw.h.

Referenced by alawtolin_framein(), ast_dsp_process(), calc_energy(), dahdi_r2_alaw_to_linear(), fill_rxgain(), fill_txgain(), and load_module().

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

Definition at line 40 of file alaw.h.

Referenced by dahdi_r2_linear_to_alaw(), fill_rxgain(), fill_txgain(), lintoalaw_framein(), and load_module().


Function Documentation

void ast_alaw_init ( void   ) 

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

Definition at line 84 of file alaw.c.

References alaw2linear(), and linear2alaw().

Referenced by main().

00085 {
00086    int i;
00087    /* 
00088     *  Set up mu-law conversion table
00089     */
00090    for(i = 0;i < 256;i++)
00091       {
00092            __ast_alaw[i] = alaw2linear(i);
00093       }
00094      /* set up the reverse (mu-law) conversion table */
00095    for(i = -32768; i < 32768; i++)
00096       {
00097       __ast_lin2a[((unsigned short)i) >> 3] = linear2alaw(i);
00098       }
00099 
00100 }


Variable Documentation

short __ast_alaw[256]

help

Definition at line 82 of file alaw.c.

unsigned char __ast_lin2a[8192]

Definition at line 81 of file alaw.c.


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