Annotation of src/usr.bin/aucat/amsg.h, Revision 1.19
1.19 ! ratchov 1: /* $OpenBSD: amsg.h,v 1.18 2010/10/21 18:57:42 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: */
1.5 ratchov 17: #ifndef AMSG_H
18: #define AMSG_H
1.1 ratchov 19:
20: #include <stdint.h>
1.18 ratchov 21: #include "conf.h"
1.1 ratchov 22:
23: /*
24: * WARNING: since the protocol may be simultaneously used by static
25: * binaries or by different versions of a shared library, we are not
26: * allowed to change the packet binary representation in a backward
27: * incompatible way.
1.6 ratchov 28: *
29: * Especially, make sure the amsg_xxx structures are not larger
30: * than 32 bytes.
1.1 ratchov 31: */
32: struct amsg {
33: #define AMSG_ACK 0 /* ack for START/STOP */
34: #define AMSG_GETPAR 1 /* get the current parameters */
35: #define AMSG_SETPAR 2 /* set the current parameters */
36: #define AMSG_START 3 /* request the server to start the stream */
1.4 ratchov 37: #define AMSG_STOP 4 /* request the server to stop the stream */
1.1 ratchov 38: #define AMSG_DATA 5 /* data block */
1.17 ratchov 39: #define AMSG_POS 6 /* initial position */
40: #define AMSG_MOVE 7 /* position changed */
41: #define AMSG_GETCAP 8 /* get capabilities */
42: #define AMSG_SETVOL 9 /* set volume */
43: #define AMSG_HELLO 10 /* say hello, check versions and so ... */
44: #define AMSG_BYE 11 /* ask server to drop connection */
1.1 ratchov 45: uint32_t cmd;
46: uint32_t __pad;
47: union {
48: struct amsg_par {
1.7 ratchov 49: uint8_t legacy_mode; /* compat for old libs */
1.1 ratchov 50: uint8_t xrun; /* one of above */
51: uint8_t bps; /* bytes per sample */
52: uint8_t bits; /* actually used bits */
53: uint8_t msb; /* 1 if MSB justified */
54: uint8_t le; /* 1 if little endian */
55: uint8_t sig; /* 1 if signed */
56: uint8_t __pad1;
57: uint16_t pchan; /* play channels */
58: uint16_t rchan; /* record channels */
59: uint32_t rate; /* frames per second */
1.3 ratchov 60: uint32_t bufsz; /* total buffered frames */
1.1 ratchov 61: uint32_t round;
1.3 ratchov 62: uint32_t appbufsz; /* client side bufsz */
63: uint32_t _reserved[1]; /* for future use */
1.1 ratchov 64: } par;
65: struct amsg_cap {
66: uint32_t rate; /* native rate */
1.3 ratchov 67: uint32_t _reserved2[1]; /* for future use */
1.1 ratchov 68: uint16_t rchan; /* native rec channels */
69: uint16_t pchan; /* native play channels */
70: uint8_t bits; /* native bits per sample */
71: uint8_t bps; /* native ytes per sample */
72: uint8_t _reserved[10]; /* for future use */
73: } cap;
74: struct amsg_data {
75: #define AMSG_DATAMAX 0x1000
76: uint32_t size;
77: } data;
78: struct amsg_ts {
79: int32_t delta;
80: } ts;
1.2 ratchov 81: struct amsg_vol {
82: uint32_t ctl;
83: } vol;
1.6 ratchov 84: struct amsg_hello {
1.18 ratchov 85: uint16_t mode; /* bitmap of MODE_XXX */
1.19 ! ratchov 86: #define AMSG_VERSION 4
1.11 ratchov 87: uint8_t version; /* protocol version */
88: uint8_t reserved1[5]; /* for future use */
1.8 ratchov 89: char opt[12]; /* profile name */
1.6 ratchov 90: char who[12]; /* hint for leases */
91: } hello;
1.1 ratchov 92: } u;
93: };
94:
95: /*
1.9 ratchov 96: * Initialize an amsg structure: fill all fields with 0xff, so the read
97: * can test which fields were set.
1.1 ratchov 98: */
99: #define AMSG_INIT(m) do { memset((m), 0xff, sizeof(struct amsg)); } while (0)
100:
101: /*
1.9 ratchov 102: * Since the structure is memset to 0xff, the MSB can be used to check
103: * if any field was set.
1.1 ratchov 104: */
105: #define AMSG_ISSET(x) (((x) & (1 << (8 * sizeof(x) - 1))) == 0)
106:
1.5 ratchov 107: #endif /* !defined(AMSG_H) */
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