| 1 | /*
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| 2 | * Copyright (c) 2012 Jan Vesely
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup audio
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| 30 | * @brief HelenOS sound server
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | */
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| 35 |
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| 36 | #ifndef AUDIO_SOURCE_H_
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| 37 | #define AUDIO_SOURCE_H_
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| 38 |
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| 39 | #include <adt/list.h>
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| 40 | #include <pcm/format.h>
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| 41 |
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| 42 | typedef struct audio_source audio_source_t;
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| 43 |
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| 44 | /** Audio data source abstraction structure */
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| 45 | struct audio_source {
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| 46 | /** Link in hound's sources list */
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| 47 | link_t link;
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| 48 | /** List of connections */
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| 49 | list_t connections;
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| 50 | /** String identifier */
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| 51 | char *name;
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| 52 | /** audio data format */
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| 53 | pcm_format_t format;
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| 54 | /** backend data */
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| 55 | void *private_data;
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| 56 | /** Callback for connection and disconnection */
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| 57 | errno_t (*connection_change)(audio_source_t *source, bool added);
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| 58 | /** Ask backend for more data */
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| 59 | errno_t (*update_available_data)(audio_source_t *source, size_t size);
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| 60 | };
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| 61 |
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| 62 | /**
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| 63 | * List instance helper.
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| 64 | * @param l link
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| 65 | * @return pointer to a source structure, NULL on failure.
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| 66 | */
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| 67 | static inline audio_source_t * audio_source_list_instance(link_t *l)
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| 68 | {
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| 69 | return l ? list_get_instance(l, audio_source_t, link) : NULL;
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| 70 | }
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| 71 |
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| 72 | errno_t audio_source_init(audio_source_t *source, const char *name, void *data,
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| 73 | errno_t (*connection_change)(audio_source_t *, bool),
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| 74 | errno_t (*update_available_data)(audio_source_t *, size_t),
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| 75 | const pcm_format_t *f);
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| 76 | void audio_source_fini(audio_source_t *source);
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| 77 | errno_t audio_source_push_data(audio_source_t *source, void *data,
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| 78 | size_t size);
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| 79 | static inline const pcm_format_t *audio_source_format(const audio_source_t *s)
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| 80 | {
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| 81 | assert(s);
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| 82 | return &s->format;
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| 83 | }
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| 84 | #endif
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| 85 |
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| 86 | /**
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| 87 | * @}
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| 88 | */
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