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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 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.
*/
/**
* @file conversation/microphone.c
* @brief API to access an audio microphone; provides access to hardware microphones;
* actually just wraps the gnunet-helper-audio-record
* @author Simon Dieterle
* @author Andreas Fuchs
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_microphone_lib.h"
#include "conversation.h"
/**
* Internal data structures for the microphone.
*/
struct Microphone
{
/**
* Our configuration.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Handle for the record helper
*/
struct GNUNET_HELPER_Handle *record_helper;
/**
* Function to call with audio data (if we are enabled).
*/
GNUNET_MICROPHONE_RecordedDataCallback rdc;
/**
* Closure for @e rdc.
*/
void *rdc_cls;
};
/**
* Function to process the audio from the record helper
*
* @param cls clsoure with our `struct Microphone`
* @param msg the message from the helper
* @return #GNUNET_OK on success,
* #GNUNET_NO to stop further processing (no error)
* #GNUNET_SYSERR to stop further processing with error
*/
static int
process_record_messages (void *cls,
const struct GNUNET_MessageHeader *msg)
{
struct Microphone *mic = cls;
const struct AudioMessage *am;
if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
am = (const struct AudioMessage *) msg;
mic->rdc (mic->rdc_cls,
ntohs (msg->size) - sizeof (struct AudioMessage),
&am[1]);
return GNUNET_OK;
}
/**
* Enable a microphone.
*
* @param cls clsoure with our `struct Microphone`
* @param rdc function to call with recorded data
* @param rdc_cls closure for @a dc
*/
static int
enable (void *cls,
GNUNET_MICROPHONE_RecordedDataCallback rdc,
void *rdc_cls)
{
struct Microphone *mic = cls;
static char * const record_helper_argv[] =
{
"gnunet-helper-audio-record",
NULL
};
mic->rdc = rdc;
mic->rdc_cls = rdc_cls;
mic->record_helper = GNUNET_HELPER_start (GNUNET_NO,
"gnunet-helper-audio-record",
record_helper_argv,
&process_record_messages,
NULL, mic);
if (NULL == mic->record_helper)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Could not start record audio helper\n"));
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Function that disables a microphone.
*
* @param cls clsoure
*/
static void
disable (void *cls)
{
struct Microphone *mic = cls;
if (NULL == mic->record_helper)
{
GNUNET_break (0);
return;
}
GNUNET_break (GNUNET_OK ==
GNUNET_HELPER_kill (mic->record_helper, GNUNET_NO));
GNUNET_HELPER_destroy (mic->record_helper);
mic->record_helper = NULL;
}
/**
* Function to destroy a microphone.
*
* @param cls clsoure
*/
static void
destroy (void *cls)
{
struct Microphone *mic = cls;
if (NULL != mic->record_helper)
disable (mic);
}
/**
* Create a microphone that corresponds to the microphone hardware
* of our system.
*
* @param cfg configuration to use
* @return NULL on error
*/
struct GNUNET_MICROPHONE_Handle *
GNUNET_MICROPHONE_create_from_hardware (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_MICROPHONE_Handle *microphone;
struct Microphone *mic;
mic = GNUNET_new (struct Microphone);
mic->cfg = cfg;
microphone = GNUNET_new (struct GNUNET_MICROPHONE_Handle);
microphone->cls = mic;
microphone->enable_microphone = &enable;
microphone->disable_microphone = &disable;
microphone->destroy_microphone = &destroy;
return microphone;
}
/**
* Destroy a microphone.
*
* @param microphone microphone to destroy
*/
void
GNUNET_MICROPHONE_destroy (struct GNUNET_MICROPHONE_Handle *microphone)
{
microphone->destroy_microphone (microphone->cls);
GNUNET_free (microphone);
}
/* end of microphone.c */
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