GNUnet  0.19.4
speaker.c
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1 /*
2  This file is part of GNUnet
3  Copyright (C) 2013 GNUnet e.V.
4 
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.
9 
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.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
28 #include "platform.h"
29 #include "gnunet_speaker_lib.h"
30 #include "conversation.h"
31 
32 
36 struct Speaker
37 {
42 
47 };
48 
49 
56 static int
57 enable (void *cls)
58 {
59  struct Speaker *spe = cls;
60  static char *playback_helper_argv[] = {
61  "gnunet-helper-audio-playback",
62  NULL
63  };
64 
66  "gnunet-helper-audio-playback",
67  playback_helper_argv,
68  NULL,
69  NULL, spe);
70  if (NULL == spe->playback_helper)
71  {
73  _ ("Could not start playback audio helper.\n"));
74  return GNUNET_SYSERR;
75  }
76  return GNUNET_OK;
77 }
78 
79 
85 static void
86 disable (void *cls)
87 {
88  struct Speaker *spe = cls;
89 
90  if (NULL == spe->playback_helper)
91  {
92  GNUNET_break (0);
93  return;
94  }
98  spe->playback_helper = NULL;
99 }
100 
101 
107 static void
108 destroy (void *cls)
109 {
110  struct Speaker *spe = cls;
111 
112  if (NULL != spe->playback_helper)
113  disable (spe);
114 }
115 
116 
125 static void
126 play (void *cls,
127  size_t data_size,
128  const void *data)
129 {
130  struct Speaker *spe = cls;
131  char buf[sizeof(struct AudioMessage) + data_size];
132  struct AudioMessage *am;
133 
134  if (NULL == spe->playback_helper)
135  {
136  GNUNET_break (0);
137  return;
138  }
139  am = (struct AudioMessage *) buf;
140  am->header.size = htons (sizeof(struct AudioMessage) + data_size);
142  GNUNET_memcpy (&am[1], data, data_size);
143  (void) GNUNET_HELPER_send (spe->playback_helper,
144  &am->header,
145  GNUNET_NO,
146  NULL, NULL);
147 }
148 
149 
157 struct GNUNET_SPEAKER_Handle *
160 {
162  struct Speaker *spe;
163 
164  spe = GNUNET_new (struct Speaker);
165  spe->cfg = cfg;
167  speaker->cls = spe;
169  speaker->play = &play;
172  return speaker;
173 }
174 
175 
181 void
183 {
186 }
187 
188 
189 /* end of speaker.c */
constants for network protocols
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
static struct GNUNET_SPEAKER_Handle * speaker
Handle to the speaker.
uint32_t data
The data value.
static char buf[2048]
API to access an audio speaker; provides access to hardware speakers.
int GNUNET_HELPER_kill(struct GNUNET_HELPER_Handle *h, int soft_kill)
Sends termination signal to the helper process.
Definition: helper.c:167
struct GNUNET_HELPER_SendHandle * GNUNET_HELPER_send(struct GNUNET_HELPER_Handle *h, const struct GNUNET_MessageHeader *msg, int can_drop, GNUNET_HELPER_Continuation cont, void *cont_cls)
Send an message to the helper.
Definition: helper.c:614
struct GNUNET_HELPER_Handle * GNUNET_HELPER_start(int with_control_pipe, const char *binary_name, char *const binary_argv[], GNUNET_MessageTokenizerCallback cb, GNUNET_HELPER_ExceptionCallback exp_cb, void *cb_cls)
Starts a helper and begins reading from it.
Definition: helper.c:461
void GNUNET_HELPER_destroy(struct GNUNET_HELPER_Handle *h)
Free's the resources occupied by the helper handle.
Definition: helper.c:500
#define GNUNET_log(kind,...)
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
@ GNUNET_OK
@ GNUNET_NO
@ GNUNET_SYSERR
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
@ GNUNET_ERROR_TYPE_ERROR
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_free(ptr)
Wrapper around free.
#define GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO
Message to transmit the audio between helper and speaker/microphone library.
struct GNUNET_SPEAKER_Handle * GNUNET_SPEAKER_create_from_hardware(const struct GNUNET_CONFIGURATION_Handle *cfg)
Create a speaker that corresponds to the speaker hardware of our system.
Definition: speaker.c:158
void GNUNET_SPEAKER_destroy(struct GNUNET_SPEAKER_Handle *speaker)
Destroy a speaker.
Definition: speaker.c:182
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
static void disable(void *cls)
Function that disables a speaker.
Definition: speaker.c:86
static int enable(void *cls)
Function that enables a speaker.
Definition: speaker.c:57
static void destroy(void *cls)
Function to destroy a speaker.
Definition: speaker.c:108
static void play(void *cls, size_t data_size, const void *data)
Function to cause a speaker to play audio data.
Definition: speaker.c:126
Message to transmit the audio (between client and helpers).
Definition: conversation.h:59
struct GNUNET_MessageHeader header
Type is GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO.
Definition: conversation.h:63
The handle to a helper process.
Definition: helper.c:78
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.
A speaker is a device that can play or record audio data.
GNUNET_SPEAKER_DestroyCallback destroy_speaker
Destroy the speaker.
void * cls
Closure for the callbacks.
GNUNET_SPEAKER_PlayCallback play
Play audio.
GNUNET_SPEAKER_EnableCallback enable_speaker
Turn on the speaker.
GNUNET_SPEAKER_DisableCallback disable_speaker
Turn the speaker off.
Internal data structures for the speaker.
Definition: speaker.c:37
const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
Definition: speaker.c:41
struct GNUNET_HELPER_Handle * playback_helper
Handle for the playback helper.
Definition: speaker.c:46