Sun Aug 6 15:02:53 2006

Asterisk developer's documentation

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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]

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Detailed Description

A-Law to Signed linear conversion.

Definition in file alaw.h.

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Define Documentation

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

Definition at line 41 of file alaw.h. Referenced by alawtolin_framein(), ast_dsp_process(), fill_rxgain(), fill_txgain(), and load_module().

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

Definition at line 40 of file alaw.h. Referenced by fill_rxgain(), fill_txgain(), lintoalaw_framein(), and load_module().

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Function Documentation

void ast_alaw_init (  void   )

To init the ulaw to slinear conversion stuff, this needs to be run. Definition at line 83 of file alaw.c. References __ast_alaw, __ast_lin2a, alaw2linear(), and linear2alaw(). Referenced by main(). { int i; /* * Set up mu-law conversion table */ for(i = 0;i < 256;i++) { __ast_alaw[i] = alaw2linear(i); } /* set up the reverse (mu-law) conversion table */ for(i = -32768; i < 32768; i++) { __ast_lin2a[((unsigned short)i) >> 3] = linear2alaw(i); } }

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Variable Documentation

short __ast_alaw[256]

help Definition at line 81 of file alaw.c. Referenced by ast_alaw_init().

unsigned char __ast_lin2a[8192]

Definition at line 80 of file alaw.c. Referenced by ast_alaw_init().

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