1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
* Copyright (C) 2003 by Dave J. Andruczyk <djandruczyk at yahoo dot com>
*
* Linux eXtace Audio visualizer
*
*
* This software comes under the GPL (GNU Public License)
* You may freely copy,distribute, etc. this as long as all the source code
* is made available for FREE.
*
* No warranty is made or implied. You use this program at your own risk.
*/
#ifndef __INPUT_H__
#define __INPUT_H__
#include <config.h>
#include <enums.h>
#include <fcntl.h>
#include <gtk/gtk.h> /* needed for error window */
#ifdef HAVE_ESD
#include <esd.h>
#endif
#ifdef HAVE_ALSA
#include <alsa/asoundlib.h>
#endif
#ifdef HAVE_OSS
#include <sys/soundcard.h>
#endif
#ifdef HAVE_COMEDI
#include <comedilib.h>
#endif
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
/*
Input data type. Assume that it is a 2 byte integer.
Since COMEDI gives samples of type sampl_t = unsigned short,
we need a type conversion for ringbuffer
*/
typedef short ring_type;
#define INPUT_RING(A) (input_unsigned?((unsigned short *) ringbuffer)[A]: \
((signed short *) ringbuffer)[A])
/*
Data ring buffer is shared globally,
perhaps this should be turned into a structure.
The idea here is that the calling program sets the
size and allocates memory for ringbuffer.
The input routines set ring_channels and ring_rate.
*/
ring_type *ringbuffer; /* Array of raw audio data from input source */
int input_unsigned; /* Flag whether input data is unsigned vs. signed */
int ring_end; /* size of ring buffer in total samples */
int ring_pos; /* offset of the most recent sample in ringbuffer */
int ring_remainder; /* if partial sample has been read, leftover bytes */
int ring_channels; /* number of channels being read into input ring
This should be set with update_ring_channels(...); */
float ring_rate; /* samples read per second in each channel */
/* time that most recent data in ring buffer was read */
struct timeval input_arrival;
/* Variables needed for updating the input progress monitor window */
/* These must be initialized by routines outside of input.c */
GtkWidget *buffer_area; /* Buffer latency display window area */
GdkPixmap *buffer_pixmap; /* Buffer window backing pixmap pointer */
GdkGC *latency_monitor_gc; /* Graphics context for Arc in dircontrol */
/* Prototypes */
int input_thread_starter(int );
int input_thread_stopper(int );
void *input_reader_thread(void *);
int open_datasource(DataSource );
int close_datasource(int );
int update_ring_channels(int );
void error_close_cb(GtkWidget *, gpointer * );
#ifdef HAVE_COMEDI
comedi_t *comedi_dev_pointer(int handle);
comedi_cmd *comedi_cmd_pointer(int handle);
#endif
/* Prototypes */
#endif
|
