Annotation of src/usr.bin/aucat/abuf.h, Revision 1.7
1.7 ! ratchov 1: /* $OpenBSD: abuf.h,v 1.6 2008/08/14 09:44:15 ratchov Exp $ */
1.1 ratchov 2: /*
3: * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17: #ifndef ABUF_H
18: #define ABUF_H
19:
20: #include <sys/queue.h>
21:
22: struct abuf;
23: struct aproc;
24:
25: struct abuf {
26: /*
1.4 ratchov 27: * Misc aproc-specific per-buffer parameters.
28: * since the buffer can connect any pair of aproc structure,
29: * each aproc must have it's own specific data. Thus we cannot
30: * use an union. The only exception is the xrun field, because
31: * there can be only one aproc that absorbs xruns in any
32: * intput->output path.
1.1 ratchov 33: */
34: int mixvol; /* input gain */
35: unsigned mixdone; /* input of mixer */
36: unsigned mixtodo; /* output of mixer */
37: unsigned subdone; /* output if sub */
1.4 ratchov 38: #define XRUN_IGNORE 0 /* on xrun silently insert/discard samples */
39: #define XRUN_SYNC 1 /* catchup to sync to the mix/sub */
40: #define XRUN_ERROR 2 /* xruns are errors, eof/hup buffer */
41: unsigned xrun; /* common to mix and sub */
1.1 ratchov 42: LIST_ENTRY(abuf) ient; /* for mix inputs list */
43: LIST_ENTRY(abuf) oent; /* for sub outputs list */
44:
45: /*
46: * fifo parameters
47: */
48: unsigned bpf; /* bytes per frame */
49: unsigned start; /* offset where data starts */
50: unsigned used; /* valid data */
51: unsigned len; /* size of the ring */
1.7 ! ratchov 52: unsigned abspos; /* frame number of the start position */
1.6 ratchov 53: unsigned silence; /* silence to insert on next write */
54: unsigned drop; /* frames to drop on next read */
1.1 ratchov 55: struct aproc *rproc; /* reader */
56: struct aproc *wproc; /* writer */
1.6 ratchov 57: unsigned char *data; /* actual data (immediately following) */
1.1 ratchov 58: };
59:
60: /*
61: * the buffer contains at least one frame. This macro should
62: * be used to check if the buffer can be flushed
63: */
64: #define ABUF_ROK(b) ((b)->used >= (b)->bpf)
65:
66: /*
67: * there's room for at least one frame
68: */
69: #define ABUF_WOK(b) ((b)->len - (b)->used >= (b)->bpf)
70:
71: /*
72: * the buffer is empty and has no more writer
73: */
74: #define ABUF_EOF(b) (!ABUF_ROK(b) && (b)->wproc == NULL)
75:
76: /*
77: * similar to !ABUF_WOK, but is used for file i/o, where
78: * operation may not involve an integer number of frames
79: */
80: #define ABUF_FULL(b) ((b)->used == (b)->len)
81:
82: /*
83: * same as !ABUF_ROK, but used for files, where
84: * operations are byte orientated, not frame-oriented
85: */
86: #define ABUF_EMPTY(b) ((b)->used == 0)
87:
88: struct abuf *abuf_new(unsigned, unsigned);
89: void abuf_del(struct abuf *);
90: unsigned char *abuf_rgetblk(struct abuf *, unsigned *, unsigned);
91: unsigned char *abuf_wgetblk(struct abuf *, unsigned *, unsigned);
1.5 ratchov 92: void abuf_rdiscard(struct abuf *, unsigned);
93: void abuf_wcommit(struct abuf *, unsigned);
1.1 ratchov 94: void abuf_fill(struct abuf *);
95: void abuf_flush(struct abuf *);
96: void abuf_eof(struct abuf *);
97: void abuf_hup(struct abuf *);
98: void abuf_run(struct abuf *);
99:
100: #endif /* !defined(ABUF_H) */