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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/* $OpenBSD: abuf.h,v 1.19 2009/10/09 16:49:48 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef ABUF_H
#define ABUF_H
#include <sys/queue.h>
#define XRUN_IGNORE 0 /* on xrun silently insert/discard samples */
#define XRUN_SYNC 1 /* catchup to sync to the mix/sub */
#define XRUN_ERROR 2 /* xruns are errors, eof/hup buffer */
#define MIDI_MSGMAX 16 /* max size of MIDI messaage */
struct aproc;
struct aparams;
struct abuf {
LIST_ENTRY(abuf) ient; /* reader's list of inputs entry */
LIST_ENTRY(abuf) oent; /* writer's list of outputs entry */
/*
* fifo parameters
*/
unsigned bpf; /* bytes per frame */
unsigned cmin, cmax; /* channel range of this buf */
unsigned start; /* offset where data starts */
unsigned used; /* valid data */
unsigned len; /* size of the ring */
unsigned abspos; /* frame number of the start position */
unsigned silence; /* silence to insert on next write */
unsigned drop; /* bytes to drop on next read */
struct aproc *rproc; /* reader */
struct aproc *wproc; /* writer */
struct abuf *duplex; /* link to buffer of the other direction */
unsigned inuse; /* in abuf_{flush,fill,run}() */
unsigned tickets; /* max data to (if throttling) */
/*
* Misc reader aproc-specific per-buffer parameters.
*/
union {
struct {
int weight; /* dynamic range */
int maxweight; /* max dynamic range allowed */
unsigned vol; /* volume within the dynamic range */
unsigned done; /* bytes ready */
unsigned xrun; /* underrun policy */
} mix;
struct {
unsigned st; /* MIDI running status */
unsigned used; /* bytes used from ``msg'' */
unsigned idx; /* actual MIDI message size */
unsigned len; /* MIDI message length */
unsigned char msg[MIDI_MSGMAX];
} midi;
} r;
/*
* Misc reader aproc-specific per-buffer parameters.
*/
union {
struct {
unsigned todo; /* bytes to process */
} mix;
struct {
unsigned done; /* bytes copied */
unsigned xrun; /* overrun policy */
} sub;
} w;
};
/*
* the buffer contains at least one frame. This macro should
* be used to check if the buffer can be flushed
*/
#define ABUF_ROK(b) ((b)->used >= (b)->bpf)
/*
* there's room for at least one frame
*/
#define ABUF_WOK(b) ((b)->len - (b)->used >= (b)->bpf)
/*
* the buffer is empty and has no writer anymore
*/
#define ABUF_EOF(b) (!ABUF_ROK(b) && (b)->wproc == NULL)
/*
* the buffer has no reader anymore, note that it's not
* enough the buffer to be disconnected, because it can
* be not yet connected buffer (eg. socket play buffer)
*/
#define ABUF_HUP(b) (!ABUF_WOK(b) && (b)->rproc == NULL)
/*
* similar to !ABUF_WOK, but is used for file i/o, where
* operation may not involve an integer number of frames
*/
#define ABUF_FULL(b) ((b)->used == (b)->len)
/*
* same as !ABUF_ROK, but used for files, where
* operations are byte orientated, not frame-oriented
*/
#define ABUF_EMPTY(b) ((b)->used == 0)
struct abuf *abuf_new(unsigned, struct aparams *);
void abuf_del(struct abuf *);
void abuf_dbg(struct abuf *);
void abuf_clear(struct abuf *);
unsigned char *abuf_rgetblk(struct abuf *, unsigned *, unsigned);
unsigned char *abuf_wgetblk(struct abuf *, unsigned *, unsigned);
void abuf_rdiscard(struct abuf *, unsigned);
void abuf_wcommit(struct abuf *, unsigned);
int abuf_fill(struct abuf *);
int abuf_flush(struct abuf *);
void abuf_eof(struct abuf *);
void abuf_hup(struct abuf *);
void abuf_run(struct abuf *);
void abuf_ipos(struct abuf *, int);
void abuf_opos(struct abuf *, int);
#endif /* !defined(ABUF_H) */
|
