Release 4.7 drivers/isdn/i4l/isdn_audio.h

/* $Id: isdn_audio.h,v 1.1.2.2 2004/01/12 22:37:18 keil Exp $
 *
 * Linux ISDN subsystem, audio conversion and compression (linklevel).
 *
 * Copyright 1994-1999 by Fritz Elfert (fritz@isdn4linux.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */


#define DTMF_NPOINTS 205        
/* Number of samples for DTMF recognition */

typedef struct adpcm_state {
	
int a;
	
int d;
	
int word;
	
int nleft;
	
int nbits;
} 
adpcm_state;


typedef struct dtmf_state {
	
char last;
	
char llast;
	
int idx;
	
int buf[DTMF_NPOINTS];
} 
dtmf_state;


typedef struct silence_state {
	
int state;
	
unsigned int idx;
} 
silence_state;

extern void isdn_audio_ulaw2alaw(unsigned char *, unsigned long);
extern void isdn_audio_alaw2ulaw(unsigned char *, unsigned long);
extern adpcm_state *isdn_audio_adpcm_init(adpcm_state *, int);
extern int isdn_audio_adpcm2xlaw(adpcm_state *, int, unsigned char *, unsigned char *, int);
extern int isdn_audio_xlaw2adpcm(adpcm_state *, int, unsigned char *, unsigned char *, int);
extern void isdn_audio_calc_dtmf(modem_info *, unsigned char *, int, int);
extern void isdn_audio_eval_dtmf(modem_info *);
dtmf_state *isdn_audio_dtmf_init(dtmf_state *);
extern void isdn_audio_calc_silence(modem_info *, unsigned char *, int, int);
extern void isdn_audio_eval_silence(modem_info *);
silence_state *isdn_audio_silence_init(silence_state *);
extern void isdn_audio_put_dle_code(modem_info *, u_char);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
209
98.12%
4
80.00%
andrew morton
andrew morton
4
1.88%
1
20.00%
Total
213
100.00%
5
100.00%
  
Directory: drivers/isdn/i4l

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