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Don't attempt to build debs for dapper (which is where the
[disorder] / lib / speaker-protocol.h
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ea410ba1 1/*
2 * This file is part of DisOrder
5aff007d 3 * Copyright (C) 2005, 2007, 2008 Richard Kettlewell
ea410ba1 4 *
e7eb3a27 5 * This program is free software: you can redistribute it and/or modify
ea410ba1 6 * it under the terms of the GNU General Public License as published by
e7eb3a27 7 * the Free Software Foundation, either version 3 of the License, or
ea410ba1 8 * (at your option) any later version.
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9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
ea410ba1 15 * You should have received a copy of the GNU General Public License
e7eb3a27 16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
ea410ba1 17 */
fbf86993 18/** @file lib/speaker-protocol.h
ea410ba1 19 * @brief Speaker/server protocol support
20 *
21 * This file defines the protocol by which the main server and the speaker
22 * process communicate.
23 */
24
cf714d85 25#ifndef SPEAKER_PROTOCOL_H
26#define SPEAKER_PROTOCOL_H
ea410ba1 27
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28#include "byte-order.h"
29
ea410ba1 30/** @brief A message from the main server to the speaker, or vica versa */
31struct speaker_message {
32 /** @brief Message type
33 *
34 * Messges from the main server:
ea410ba1 35 * - @ref SM_PLAY
36 * - @ref SM_PAUSE
37 * - @ref SM_RESUME
38 * - @ref SM_CANCEL
39 * - @ref SM_RELOAD
40 *
41 * Messages from the speaker:
42 * - @ref SM_PAUSED
43 * - @ref SM_FINISHED
44 * - @ref SM_PLAYING
2b2a5fed 45 * - @ref SM_UNKNOWN
ea410ba1 46 */
47 int type;
48
49 /** @brief Message-specific data */
50 long data;
51
52 /** @brief Track ID (including 0 terminator) */
53 char id[24]; /* ID including terminator */
54};
55
56/* messages from the main DisOrder server */
ea410ba1 57
58/** @brief Play track @c id
59 *
60 * The track must already have been prepared.
61 */
62#define SM_PLAY 1
63
64/** @brief Pause current track */
65#define SM_PAUSE 2
66
67/** @brief Resume current track */
68#define SM_RESUME 3
69
70/** @brief Cancel track @c id */
71#define SM_CANCEL 4
72
73/** @brief Reload configuration */
74#define SM_RELOAD 5
75
76/* messages from the speaker */
77/** @brief Paused track @c id, @c data seconds in
78 *
79 * There is no @c SM_RESUMED, instead @ref SM_PLAYING is sent after the track
80 * starts playing again.
81 */
82#define SM_PAUSED 128
83
84/** @brief Finished playing track @c id */
85#define SM_FINISHED 129
86
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87/** @brief Never heard of track @c id */
88#define SM_UNKNOWN 130
89
ea410ba1 90/** @brief Currently track @c id, @c data seconds in
91 *
92 * This is sent from time to time while a track is playing.
93 */
94#define SM_PLAYING 131
95
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96/** @brief Speaker process is ready
97 *
98 * This is sent once at startup when the speaker has finished its
99 * initialization. */
100#define SM_READY 132
101
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102/** @brief Cancelled track @c id which wasn't playing */
103#define SM_STILLBORN 133
104
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105void speaker_send(int fd, const struct speaker_message *sm);
106/* Send a message. */
ea410ba1 107
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108int speaker_recv(int fd, struct speaker_message *sm);
109/* Receive a message. Return 0 on EOF, +ve if a message is read, -1 on EAGAIN,
110 * terminates on any other error. */
ea410ba1 111
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112/** @brief One chunk in a stream */
113struct stream_header {
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114 /** @brief Number of bytes */
115 uint32_t nbytes;
116
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117 /** @brief Frames per second */
118 uint32_t rate;
119
120 /** @brief Samples per frames */
121 uint8_t channels;
122
123 /** @brief Bits per sample */
124 uint8_t bits;
125
126 /** @brief Endianness */
127 uint8_t endian;
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128} attribute((packed));
129
130static inline int formats_equal(const struct stream_header *a,
131 const struct stream_header *b) {
132 return (a->rate == b->rate
133 && a->channels == b->channels
134 && a->bits == b->bits
135 && a->endian == b->endian);
136}
137
cf714d85 138#endif /* SPEAKER_PROTOCOL_H */
ea410ba1 139
140/*
141Local Variables:
142c-basic-offset:2
143comment-column:40
144fill-column:79
145indent-tabs-mode:nil
146End:
147*/