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 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: ausys.h,v $
  32  * Revision 1.1  2002/02/02 19:16:28  mdw
  33  * New audio subsystem.
  34  *
  35  */
  36
  37 #ifndef AUSYS_H
  38 #define AUSYS_H
  39
  40 #ifdef __cplusplus
  41   extern "C" {
  42 #endif
  43
  44 /*----- Header files ------------------------------------------------------*/
  45
  46 #ifndef AU_H
  47 #  include "au.h"
  48 #endif
  49
  50 /*----- Global variables --------------------------------------------------*/
  51
  52 extern const char *const ausys_suffix;  /* Suffix for audio files */
  53
  54 /*----- Functions provided ------------------------------------------------*/
  55
  56 /* --- @ausys_init@ --- *
  57  *
  58  * Arguments:   ---
  59  *
  60  * Returns:     ---
  61  *
  62  * Use:         Does any initialization required by the system-specific audio
  63  *              handler.
  64  */
  65
  66 extern void ausys_init(void);
  67
  68 /* --- @ausys_shutdown@ --- *
  69  *
  70  * Arguments:   ---
  71  *
  72  * Returns:     ---
  73  *
  74  * Use:         Does any tidying up required.
  75  */
  76
  77 extern void ausys_shutdown(void);
  78
  79 /* --- @ausys_lock@, @ausys_unlock@ --- *
  80  *
  81  * Arguments:   ---
  82  *
  83  * Returns:     ---
  84  *
  85  * Use:         Locks or unlocks the audio subsystem.  This protects the
  86  *              audio queue from becoming corrupted during all the tedious
  87  *              asynchronous stuff.
  88  */
  89
  90 extern void ausys_lock(void);
  91 extern void ausys_unlock(void);
  92
  93 /* --- @ausys_queue@ --- *
  94  *
  95  * Arguments:   @au_data *a@ = an audio thingy to play
  96  *
  97  * Returns:     ---
  98  *
  99  * Use:         Queues an audio sample to be played.  The sample should be
 100  *              freed (with @au_free@) when it's no longer wanted.
 101  */
 102
 103 extern void ausys_queue(au_data */*a*/);
 104
 105 /* --- @ausys_decode@ --- *
 106  *
 107  * Arguments:   @au_sample *s@ = pointer to sample block
 108  *              @const void *p@ = pointer to sample file contents
 109  *              @size_t sz@ = size of sample file contents
 110  *
 111  * Returns:     Pointer to a sample data structure.
 112  *
 113  * Use:         Decodes a WAV file into something the system-specific layer
 114  *              actually wants to deal with.
 115  */
 116
 117 extern au_data *ausys_decode(au_sample */*s*/,
 118                              const void */*p*/, size_t /*sz*/);
 119
 120 /* --- @ausys_free@ --- *
 121  *
 122  * Arguments:   @au_data *a@ = an audio thingy to free
 123  *
 124  * Returns:     ---
 125  *
 126  * Use:         Frees a decoded audio sample.
 127  */
 128
 129 extern void ausys_free(au_data */*a*/);
 130
 131 /*----- That's all, folks -------------------------------------------------*/
 132
 133 #ifdef __cplusplus
 134   }
 135 #endif
 136
 137 #endif