2 * This file is part of DisOrder
3 * Copyright (C) 2005, 2007, 2008, 2013 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file lib/speaker-protocol.h
19 * @brief Speaker/server protocol support
21 * This file defines the protocol by which the main server and the speaker
22 * process communicate.
25 #ifndef SPEAKER_PROTOCOL_H
26 #define SPEAKER_PROTOCOL_H
28 #include "byte-order.h"
29 #include <netinet/in.h>
31 /** @brief A message from the main server to the speaker, or vica versa */
32 struct speaker_message {
33 /** @brief Message type
35 * Messages from the main server:
41 * - @ref SM_RTP_REQUEST
42 * - @ref SM_RTP_CANCEL
44 * Messages from the speaker:
53 /** @brief Message-specific data */
57 /** @brief Track ID (including 0 terminator) */
58 char id[24]; /* ID including terminator */
60 /** @brief An IP address (for @ref SM_RTP_REQUEST and @ref SM_RTP_CANCEL) */
61 struct sockaddr_storage address;
65 /* messages from the main DisOrder server */
67 /** @brief Play track @c id
69 * The track must already have been prepared.
73 /** @brief Pause current track */
76 /** @brief Resume current track */
79 /** @brief Cancel track @c id */
82 /** @brief Reload configuration */
85 /** @brief Reload configuration */
86 #define SM_RTP_REQUEST 6
88 /** @brief Reload configuration */
89 #define SM_RTP_CANCEL 7
91 /* messages from the speaker */
92 /** @brief Paused track @c id, @c data seconds in
94 * There is no @c SM_RESUMED, instead @ref SM_PLAYING is sent after the track
95 * starts playing again.
99 /** @brief Finished playing track @c id */
100 #define SM_FINISHED 129
102 /** @brief Never heard of track @c id */
103 #define SM_UNKNOWN 130
105 /** @brief Currently track @c id, @c data seconds in
107 * This is sent from time to time while a track is playing.
109 #define SM_PLAYING 131
111 /** @brief Speaker process is ready
113 * This is sent once at startup when the speaker has finished its
117 /** @brief Cancelled track @c id which wasn't playing */
118 #define SM_STILLBORN 133
120 /** @brief A connection for track @c id arrived */
121 #define SM_ARRIVED 134
123 void speaker_send(int fd, const struct speaker_message *sm);
124 /* Send a message. */
126 int speaker_recv(int fd, struct speaker_message *sm);
127 /* Receive a message. Return 0 on EOF, +ve if a message is read, -1 on EAGAIN,
128 * terminates on any other error. */
130 /** @brief One chunk in a stream */
131 struct stream_header {
132 /** @brief Number of bytes */
135 /** @brief Frames per second */
138 /** @brief Samples per frames */
141 /** @brief Bits per sample */
144 /** @brief Endianness */
146 } attribute((packed));
148 static inline int formats_equal(const struct stream_header *a,
149 const struct stream_header *b) {
150 return (a->rate == b->rate
151 && a->channels == b->channels
152 && a->bits == b->bits
153 && a->endian == b->endian);
156 #endif /* SPEAKER_PROTOCOL_H */