1 /*****************************************************************************
2 * alsa.c : alsa plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000 VideoLAN
7 * 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
26 /*****************************************************************************
28 *****************************************************************************/
32 #include <sys/types.h>
34 #include <sys/asoundlib.h> /* for alsa :) */
35 #include <linux/asound.h>
37 #include <stdlib.h> /* malloc(), free() */
40 #include "common.h" /* boolean_t, byte_t */
44 #include "interface.h"
49 #include "modules_inner.h"
51 /*****************************************************************************
52 * Build configuration tree.
53 *****************************************************************************/
55 ADD_COMMENT( "Yeah, alsa rocks !" )
58 /*****************************************************************************
59 * Capabilities defined in the other files.
60 *****************************************************************************/
61 extern void aout_getfunctions( function_list_t * p_function_list );
63 /*****************************************************************************
64 * InitModule: get the module structure and configuration.
65 *****************************************************************************
66 * We have to fill psz_name, psz_longname and psz_version. These variables
67 * will be strdup()ed later by the main application because the module can
68 * be unloaded later to save memory, and we want to be able to access this
69 * data even after the module has been unloaded.
70 *****************************************************************************/
71 int InitModule( module_t * p_module )
73 p_module->psz_name = MODULE_STRING;
74 p_module->psz_longname = "Alsa audio module";
75 p_module->psz_version = VERSION;
76 p_module->i_capabilities = MODULE_CAPABILITY_NULL
77 | MODULE_CAPABILITY_AOUT;
82 /*****************************************************************************
83 * ActivateModule: set the module to an usable state.
84 *****************************************************************************
85 * This function fills the capability functions and the configuration
86 * structure. Once ActivateModule() has been called, the i_usage can
87 * be set to 0 and calls to NeedModule() be made to increment it. To unload
88 * the module, one has to wait until i_usage == 0 and call DeactivateModule().
89 *****************************************************************************/
90 int ActivateModule( module_t * p_module )
92 p_module->p_functions = malloc( sizeof( module_functions_t ) );
93 if( p_module->p_functions == NULL )
98 aout_getfunctions( &p_module->p_functions->aout );
100 p_module->p_config = p_config;
106 /*****************************************************************************
107 * DeactivateModule: make sure the module can be unloaded.
108 *****************************************************************************
109 * This function must only be called when i_usage == 0. If it successfully
110 * returns, i_usage can be set to -1 and the module unloaded. Be careful to
111 * lock usage_lock during the whole process.
112 *****************************************************************************/
113 int DeactivateModule( module_t * p_module )
115 free( p_module->p_functions );