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/*
This file is part of GNUnet
Copyright (C) 2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file conversation/speaker.c
* @brief API to access an audio speaker; provides access to hardware speakers
* @author Simon Dieterle
* @author Andreas Fuchs
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_speaker_lib.h"
#include "conversation.h"
/**
* Internal data structures for the speaker.
*/
struct Speaker
{
/**
* Our configuration.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Handle for the playback helper
*/
struct GNUNET_HELPER_Handle *playback_helper;
};
/**
* Function that enables a speaker.
*
* @param cls closure with the `struct Speaker`
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
static int
enable (void *cls)
{
struct Speaker *spe = cls;
static char *playback_helper_argv[] =
{
"gnunet-helper-audio-playback",
NULL
};
spe->playback_helper = GNUNET_HELPER_start (GNUNET_NO,
"gnunet-helper-audio-playback",
playback_helper_argv,
NULL,
NULL, spe);
if (NULL == spe->playback_helper)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Could not start playback audio helper.\n"));
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Function that disables a speaker.
*
* @param cls closure with the `struct Speaker`
*/
static void
disable (void *cls)
{
struct Speaker *spe = cls;
if (NULL == spe->playback_helper)
{
GNUNET_break (0);
return;
}
GNUNET_break (GNUNET_OK ==
GNUNET_HELPER_kill (spe->playback_helper, GNUNET_NO));
GNUNET_HELPER_destroy (spe->playback_helper);
spe->playback_helper = NULL;
}
/**
* Function to destroy a speaker.
*
* @param cls closure with the `struct Speaker`
*/
static void
destroy (void *cls)
{
struct Speaker *spe = cls;
if (NULL != spe->playback_helper)
disable (spe);
}
/**
* Function to cause a speaker to play audio data.
*
* @param cls clsoure with the `struct Speaker`
* @param data_size number of bytes in @a data
* @param data audio data to play, format is
* opaque to the API but should be OPUS.
*/
static void
play (void *cls,
size_t data_size,
const void *data)
{
struct Speaker *spe = cls;
char buf[sizeof (struct AudioMessage) + data_size];
struct AudioMessage *am;
if (NULL == spe->playback_helper)
{
GNUNET_break (0);
return;
}
am = (struct AudioMessage *) buf;
am->header.size = htons (sizeof (struct AudioMessage) + data_size);
am->header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO);
GNUNET_memcpy (&am[1], data, data_size);
(void) GNUNET_HELPER_send (spe->playback_helper,
&am->header,
GNUNET_NO,
NULL, NULL);
}
/**
* Create a speaker that corresponds to the speaker hardware
* of our system.
*
* @param cfg configuration to use
* @return NULL on error
*/
struct GNUNET_SPEAKER_Handle *
GNUNET_SPEAKER_create_from_hardware (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_SPEAKER_Handle *speaker;
struct Speaker *spe;
spe = GNUNET_new (struct Speaker);
spe->cfg = cfg;
speaker = GNUNET_new (struct GNUNET_SPEAKER_Handle);
speaker->cls = spe;
speaker->enable_speaker = &enable;
speaker->play = &play;
speaker->disable_speaker = &disable;
speaker->destroy_speaker = &destroy;
return speaker;
}
/**
* Destroy a speaker.
*
* @param speaker speaker to destroy
*/
void
GNUNET_SPEAKER_destroy (struct GNUNET_SPEAKER_Handle *speaker)
{
speaker->destroy_speaker (speaker->cls);
GNUNET_free (speaker);
}
/* end of speaker.c */
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