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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.
*/
/**
* @author Simon Dieterle
* @author Andreas Fuchs
* @author Christian Grothoff
*
* @file
* API to access an audio microphone; provides access to hardware microphones
*
* @defgroup microphone Microphone library
* Provides access to hardware microphones.
* @{
*/
#ifndef GNUNET_MICROPHONE_SERVICE_H
#define GNUNET_MICROPHONE_SERVICE_H
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "gnunet_util_lib.h"
/**
* Process recorded audio data.
*
* @param cls clsoure
* @param data_size number of bytes in @a data
* @param data audio data to play
*/
typedef void (*GNUNET_MICROPHONE_RecordedDataCallback)(void *cls,
size_t data_size,
const void *data);
/**
* Enable a microphone.
*
* @param cls clsoure
* @param rdc function to call with recorded data
* @param rdc_cls closure for @a dc
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
typedef int (*GNUNET_MICROPHONE_EnableCallback)(void *cls,
GNUNET_MICROPHONE_RecordedDataCallback rdc,
void *rdc_cls);
/**
* Function that disables a microphone.
*
* @param cls clsoure
*/
typedef void (*GNUNET_MICROPHONE_DisableCallback)(void *cls);
/**
* Function to destroy a microphone.
*
* @param cls clsoure
*/
typedef void (*GNUNET_MICROPHONE_DestroyCallback)(void *cls);
/**
* A microphone is a device that can capture or otherwise produce audio data.
*/
struct GNUNET_MICROPHONE_Handle
{
/**
* Turn on the microphone.
*/
GNUNET_MICROPHONE_EnableCallback enable_microphone;
/**
* Turn the microphone off.
*/
GNUNET_MICROPHONE_DisableCallback disable_microphone;
/**
* Destroy the microphone. Called by #GNUNET_MICROPHONE_destroy.
*/
GNUNET_MICROPHONE_DestroyCallback destroy_microphone;
/**
* Closure for the callbacks.
*/
void *cls;
};
/**
* 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);
/**
* Destroy a microphone.
*
* @param microphone microphone to destroy
*/
void
GNUNET_MICROPHONE_destroy (struct GNUNET_MICROPHONE_Handle *microphone);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
#endif
/** @} */ /* end of group */
/* end of gnunet_microphone_lib.h */
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