mdw@git.distorted.org.uk Git - jog/blob - ausys.h

   1 /* -*-c-*-
   2  *
   3  * $Id: ausys.h,v 1.1 2002/02/02 19:16:28 mdw Exp $
   4  *
   5  * System-specific audio-handling interface
   6  *
   7  * (c) 2002 Mark Wooding
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Jog: Programming for a jogging machine.
  13  *
  14  * Jog is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * Jog is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with Jog; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 #ifndef AUSYS_H
  30 #define AUSYS_H
  31
  32 #ifdef __cplusplus
  33   extern "C" {
  34 #endif
  35
  36 /*----- Header files ------------------------------------------------------*/
  37
  38 #ifndef AU_H
  39 #  include "au.h"
  40 #endif
  41
  42 /*----- Global variables --------------------------------------------------*/
  43
  44 extern const char *const ausys_suffix;  /* Suffix for audio files */
  45
  46 /*----- Functions provided ------------------------------------------------*/
  47
  48 /* --- @ausys_init@ --- *
  49  *
  50  * Arguments:   ---
  51  *
  52  * Returns:     ---
  53  *
  54  * Use:         Does any initialization required by the system-specific audio
  55  *              handler.
  56  */
  57
  58 extern void ausys_init(void);
  59
  60 /* --- @ausys_shutdown@ --- *
  61  *
  62  * Arguments:   ---
  63  *
  64  * Returns:     ---
  65  *
  66  * Use:         Does any tidying up required.
  67  */
  68
  69 extern void ausys_shutdown(void);
  70
  71 /* --- @ausys_lock@, @ausys_unlock@ --- *
  72  *
  73  * Arguments:   ---
  74  *
  75  * Returns:     ---
  76  *
  77  * Use:         Locks or unlocks the audio subsystem.  This protects the
  78  *              audio queue from becoming corrupted during all the tedious
  79  *              asynchronous stuff.
  80  */
  81
  82 extern void ausys_lock(void);
  83 extern void ausys_unlock(void);
  84
  85 /* --- @ausys_queue@ --- *
  86  *
  87  * Arguments:   @au_data *a@ = an audio thingy to play
  88  *
  89  * Returns:     ---
  90  *
  91  * Use:         Queues an audio sample to be played.  The sample should be
  92  *              freed (with @au_free@) when it's no longer wanted.
  93  */
  94
  95 extern void ausys_queue(au_data */*a*/);
  96
  97 /* --- @ausys_decode@ --- *
  98  *
  99  * Arguments:   @au_sample *s@ = pointer to sample block
 100  *              @const void *p@ = pointer to sample file contents
 101  *              @size_t sz@ = size of sample file contents
 102  *
 103  * Returns:     Pointer to a sample data structure.
 104  *
 105  * Use:         Decodes a WAV file into something the system-specific layer
 106  *              actually wants to deal with.
 107  */
 108
 109 extern au_data *ausys_decode(au_sample */*s*/,
 110                              const void */*p*/, size_t /*sz*/);
 111
 112 /* --- @ausys_free@ --- *
 113  *
 114  * Arguments:   @au_data *a@ = an audio thingy to free
 115  *
 116  * Returns:     ---
 117  *
 118  * Use:         Frees a decoded audio sample.
 119  */
 120
 121 extern void ausys_free(au_data */*a*/);
 122
 123 /*----- That's all, folks -------------------------------------------------*/
 124
 125 #ifdef __cplusplus
 126   }
 127 #endif
 128
 129 #endif