1 /*****************************************************************************
2 * alsa.c : alsa plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000 VideoLAN
5 * $Id: alsa.c,v 1.9 2001/04/27 16:08:26 sam Exp $
7 * Authors: Henri Fallon <henri@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 #define MODULE_NAME alsa
25 #include "modules_inner.h"
27 /*****************************************************************************
29 *****************************************************************************/
33 #include <stdlib.h> /* malloc(), free() */
36 #include "common.h" /* boolean_t, byte_t */
42 /*****************************************************************************
43 * Build configuration tree.
44 *****************************************************************************/
46 ADD_COMMENT( "Yeah, alsa rocks !" )
49 /*****************************************************************************
50 * Capabilities defined in the other files.
51 *****************************************************************************/
52 void _M( aout_getfunctions )( function_list_t * p_function_list );
54 /*****************************************************************************
55 * InitModule: get the module structure and configuration.
56 *****************************************************************************
57 * We have to fill psz_name, psz_longname and psz_version. These variables
58 * will be strdup()ed later by the main application because the module can
59 * be unloaded later to save memory, and we want to be able to access this
60 * data even after the module has been unloaded.
61 *****************************************************************************/
64 p_module->psz_name = MODULE_STRING;
65 p_module->psz_longname = "Alsa audio module";
66 p_module->psz_version = VERSION;
67 p_module->i_capabilities = MODULE_CAPABILITY_NULL
68 | MODULE_CAPABILITY_AOUT;
73 /*****************************************************************************
74 * ActivateModule: set the module to an usable state.
75 *****************************************************************************
76 * This function fills the capability functions and the configuration
77 * structure. Once ActivateModule() has been called, the i_usage can
78 * be set to 0 and calls to NeedModule() be made to increment it. To unload
79 * the module, one has to wait until i_usage == 0 and call DeactivateModule().
80 *****************************************************************************/
83 p_module->p_functions = malloc( sizeof( module_functions_t ) );
84 if( p_module->p_functions == NULL )
89 _M( aout_getfunctions )( &p_module->p_functions->aout );
91 p_module->p_config = p_config;
97 /*****************************************************************************
98 * DeactivateModule: make sure the module can be unloaded.
99 *****************************************************************************
100 * This function must only be called when i_usage == 0. If it successfully
101 * returns, i_usage can be set to -1 and the module unloaded. Be careful to
102 * lock usage_lock during the whole process.
103 *****************************************************************************/
106 free( p_module->p_functions );