1 /*****************************************************************************
2 * dsp.c : OSS /dev/dsp module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000 VideoLAN
5 * $Id: dsp.c,v 1.8 2001/03/21 13:42:33 sam Exp $
7 * Authors: Michel Kaempf <maxx@via.ecp.fr>
8 * Samuel Hocevar <sam@zoy.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 #define MODULE_NAME dsp
26 #include "modules_inner.h"
28 /*****************************************************************************
30 *****************************************************************************/
33 #include <stdlib.h> /* malloc(), free() */
34 #include <string.h> /* strdup() */
37 #include "common.h" /* boolean_t, byte_t */
43 /*****************************************************************************
44 * Build configuration tree.
45 *****************************************************************************/
47 ADD_WINDOW( "Configuration for dsp module" )
48 ADD_FRAME( "OSS Device" )
49 ADD_FILE( "Device name: ", MODULE_VAR(device), NULL )
52 /*****************************************************************************
53 * Capabilities defined in the other files.
54 *****************************************************************************/
55 void _M( aout_getfunctions )( function_list_t * p_function_list );
57 /*****************************************************************************
58 * InitModule: get the module structure and configuration.
59 *****************************************************************************
60 * We have to fill psz_name, psz_longname and psz_version. These variables
61 * will be strdup()ed later by the main application because the module can
62 * be unloaded later to save memory, and we want to be able to access this
63 * data even after the module has been unloaded.
64 *****************************************************************************/
67 p_module->psz_name = MODULE_STRING;
68 p_module->psz_longname = "Linux OSS /dev/dsp module";
69 p_module->psz_version = VERSION;
71 p_module->i_capabilities = MODULE_CAPABILITY_NULL
72 | MODULE_CAPABILITY_AOUT;
77 /*****************************************************************************
78 * ActivateModule: set the module to an usable state.
79 *****************************************************************************
80 * This function fills the capability functions and the configuration
81 * structure. Once ActivateModule() has been called, the i_usage can
82 * be set to 0 and calls to NeedModule() be made to increment it. To unload
83 * the module, one has to wait until i_usage == 0 and call DeactivateModule().
84 *****************************************************************************/
87 p_module->p_functions = malloc( sizeof( module_functions_t ) );
88 if( p_module->p_functions == NULL )
93 _M( aout_getfunctions )( &p_module->p_functions->aout );
95 p_module->p_config = p_config;
100 /*****************************************************************************
101 * DeactivateModule: make sure the module can be unloaded.
102 *****************************************************************************
103 * This function must only be called when i_usage == 0. If it successfully
104 * returns, i_usage can be set to -1 and the module unloaded. Be careful to
105 * lock usage_lock during the whole process.
106 *****************************************************************************/
109 free( p_module->p_functions );