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/*
* FILE: audio_types.h
* PROGRAM: RAT
* AUTHOR: Orion Hodson
*
* Copyright (c) 1998-2001 University College London
* All rights reserved.
*
* $Id: audio_types.h,v 1.20 2001/07/06 22:00:23 ucaccsp Exp $
*/
#ifndef _RAT_AUDIO_TYPES_H_
#define _RAT_AUDIO_TYPES_H_
/* This version of the code can only work with a constant device */
/* encoding. To use different encodings the parameters below have */
/* to be changed and the program recompiled. */
/* The clock translation problems have to be taken into consideration */
/* if different users use different base encodings... */
typedef enum {
DEV_PCMU, /* mu-law (8 bits) */
DEV_PCMA, /* a-law (8 bits) */
DEV_S8, /* signed 8 bits */
DEV_U8, /* unsigned 8 bits */
DEV_S16 /* signed 16 bits */
} deve_e;
typedef struct s_audio_format {
deve_e encoding;
int sample_rate; /* Should be one of 8000, 16000, 24000, 32000, 48000 */
int bits_per_sample; /* Should be 8 or 16 */
int channels; /* Should be 1 or 2 */
int bytes_per_block; /* size of unit we will read/write in */
} audio_format;
typedef short sample; /* Sample representation 16 bit signed */
typedef int audio_desc_t; /* Unique handle for identifying audio devices */
#define AUDIO_DEVICE_NAME_LENGTH 63
typedef struct {
audio_desc_t descriptor;
char *name;
} audio_device_details_t;
typedef uint32_t audio_port_t;
#define AUDIO_PORT_NAME_LENGTH 20
#define AUDIO_PORT_PHONE "Phone"
#define AUDIO_PORT_SPEAKER "Speaker"
#define AUDIO_PORT_HEADPHONE "Headphone"
#define AUDIO_PORT_LINE_OUT "Line-Out"
#define AUDIO_PORT_MICROPHONE "Microphone"
#define AUDIO_PORT_LINE_IN "Line-In"
#define AUDIO_PORT_CD "CD"
typedef struct {
audio_port_t port;
char name[AUDIO_PORT_NAME_LENGTH + 1];
} audio_port_details_t;
#define BYTES_PER_SAMPLE sizeof(sample)
#define PCMU_AUDIO_ZERO 127
#define PCMA_AUDIO_ZERO 213
#define L16_AUDIO_ZERO 0
#define MAX_AMP 100
#define DEVICE_REC_BUF 16000
#define DEVICE_BUF_UNIT 320
#endif /* _RAT_AUDIO_TYPES_H_ */
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