/*
* Copyright (c) 2012 Jan Vesely
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup audio
* @brief HelenOS sound server
* @{
*/
/** @file
*/
#ifndef AUDIO_SOURCE_H_
#define AUDIO_SOURCE_H_
#include <adt/list.h>
#include <pcm/format.h>
typedef struct audio_source audio_source_t;
/** Audio data source abstraction structure */
struct audio_source {
/** Link in hound's sources list */
link_t link;
/** List of connections */
list_t connections;
/** String identifier */
char *name;
/** audio data format */
pcm_format_t format;
/** backend data */
void *private_data;
/** Callback for connection and disconnection */
errno_t (*connection_change)(audio_source_t *source, bool added);
/** Ask backend for more data */
errno_t (*update_available_data)(audio_source_t *source, size_t size);
};
/**
* List instance helper.
* @param l link
* @return pointer to a source structure, NULL on failure.
*/
static inline audio_source_t *audio_source_list_instance(link_t *l)
{
return l ? list_get_instance(l, audio_source_t, link) : NULL;
}
errno_t audio_source_init(audio_source_t *source, const char *name, void *data,
errno_t (*connection_change)(audio_source_t *, bool),
errno_t (*update_available_data)(audio_source_t *, size_t),
const pcm_format_t *f);
void audio_source_fini(audio_source_t *source);
errno_t audio_source_push_data(audio_source_t *source, void *data,
size_t size);
static inline const pcm_format_t *audio_source_format(const audio_source_t *s)
{
assert(s);
return &s->format;
}
#endif
/**
* @}
*/