2 This file is part of GNUnet
3 Copyright (C) 2013 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
17 * @author Simon Dieterle
18 * @author Andreas Fuchs
19 * @author Christian Grothoff
22 * API to access an audio speaker; provides access to hardware speakers
24 * @defgroup speaker Speaker service
25 * Access hardware audio speakers.
28 #ifndef GNUNET_SPEAKER_SERVICE_H
29 #define GNUNET_SPEAKER_SERVICE_H
34 #if 0 /* keep Emacsens' auto-indent happy */
39 #include "gnunet_util_lib.h"
42 * Function that enables a speaker.
45 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
47 typedef int (*GNUNET_SPEAKER_EnableCallback)(void *cls);
50 * Function that disables a speaker.
54 typedef void (*GNUNET_SPEAKER_DisableCallback)(void *cls);
57 * Function to destroy a speaker.
61 typedef void (*GNUNET_SPEAKER_DestroyCallback)(void *cls);
64 * Function to cause a speaker to play audio data.
67 * @param data_size number of bytes in @a data
68 * @param data audio data to play, format is
69 * opaque to the API but should be OPUS.
71 typedef void (*GNUNET_SPEAKER_PlayCallback)(void *cls,
77 * A speaker is a device that can play or record audio data.
79 struct GNUNET_SPEAKER_Handle
83 * Turn on the speaker.
85 GNUNET_SPEAKER_EnableCallback enable_speaker;
90 GNUNET_SPEAKER_PlayCallback play;
93 * Turn the speaker off.
95 GNUNET_SPEAKER_DisableCallback disable_speaker;
98 * Destroy the speaker. Called by #GNUNET_SPEAKER_destroy.
100 GNUNET_SPEAKER_DestroyCallback destroy_speaker;
103 * Closure for the callbacks.
111 * Create a speaker that corresponds to the speaker hardware
114 * @param cfg configuration to use
115 * @return NULL on error
117 struct GNUNET_SPEAKER_Handle *
118 GNUNET_SPEAKER_create_from_hardware (const struct GNUNET_CONFIGURATION_Handle *cfg);
124 * @param speaker speaker to destroy
127 GNUNET_SPEAKER_destroy (struct GNUNET_SPEAKER_Handle *speaker);
130 #if 0 /* keep Emacsens' auto-indent happy */
139 /** @} */ /* end of group */
141 /* end of gnunet_speaker_lib.h */