1 /*****************************************************************************
2 * downmix.c : AC3 downmix module
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: downmix.c,v 1.1 2001/05/15 16:19:42 sam Exp $
7 * Authors: Gaƫl Hendryckx <jimmy@via.ecp.fr>
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 downmix
25 #include "modules_inner.h"
27 /*****************************************************************************
29 *****************************************************************************/
40 #include "ac3_downmix.h"
41 #include "ac3_downmix_common.h"
45 /*****************************************************************************
46 * Local and extern prototypes.
47 *****************************************************************************/
48 static void downmix_getfunctions( function_list_t * p_function_list );
49 static int downmix_Probe ( probedata_t *p_data );
51 /*****************************************************************************
52 * Build configuration tree.
53 *****************************************************************************/
55 ADD_WINDOW( "Configuration for AC3 downmix module" )
56 ADD_COMMENT( "Ha, ha -- nothing to configure yet" )
59 /*****************************************************************************
60 * InitModule: get the module structure and configuration.
61 *****************************************************************************
62 * We have to fill psz_name, psz_longname and psz_version. These variables
63 * will be strdup()ed later by the main application because the module can
64 * be unloaded later to save memory, and we want to be able to access this
65 * data even after the module has been unloaded.
66 *****************************************************************************/
69 p_module->psz_name = MODULE_STRING;
70 p_module->psz_longname = "AC3 downmix module";
71 p_module->psz_version = VERSION;
73 p_module->i_capabilities = MODULE_CAPABILITY_NULL
74 | MODULE_CAPABILITY_DOWNMIX;
79 /*****************************************************************************
80 * ActivateModule: set the module to an usable state.
81 *****************************************************************************
82 * This function fills the capability functions and the configuration
83 * structure. Once ActivateModule() has been called, the i_usage can
84 * be set to 0 and calls to NeedModule() be made to increment it. To unload
85 * the module, one has to wait until i_usage == 0 and call DeactivateModule().
86 *****************************************************************************/
89 p_module->p_functions = malloc( sizeof( module_functions_t ) );
90 if( p_module->p_functions == NULL )
95 downmix_getfunctions( &p_module->p_functions->downmix );
97 p_module->p_config = p_config;
102 /*****************************************************************************
103 * DeactivateModule: make sure the module can be unloaded.
104 *****************************************************************************
105 * This function must only be called when i_usage == 0. If it successfully
106 * returns, i_usage can be set to -1 and the module unloaded. Be careful to
107 * lock usage_lock during the whole process.
108 *****************************************************************************/
111 free( p_module->p_functions );
116 /* Following functions are local */
118 /*****************************************************************************
119 * Functions exported as capabilities. They are declared as static so that
120 * we don't pollute the namespace too much.
121 *****************************************************************************/
122 static void downmix_getfunctions( function_list_t * p_function_list )
124 p_function_list->pf_probe = downmix_Probe;
125 #define F p_function_list->functions.downmix
126 F.pf_downmix_3f_2r_to_2ch = _M( downmix_3f_2r_to_2ch );
127 F.pf_downmix_3f_1r_to_2ch = _M( downmix_3f_1r_to_2ch );
128 F.pf_downmix_2f_2r_to_2ch = _M( downmix_2f_2r_to_2ch );
129 F.pf_downmix_2f_1r_to_2ch = _M( downmix_2f_1r_to_2ch );
130 F.pf_downmix_3f_0r_to_2ch = _M( downmix_3f_0r_to_2ch );
131 F.pf_stream_sample_2ch_to_s16 = _M( stream_sample_2ch_to_s16 );
132 F.pf_stream_sample_1ch_to_s16 = _M( stream_sample_1ch_to_s16 );
136 /*****************************************************************************
137 * downmix_Probe: returns a preference score
138 *****************************************************************************/
139 static int downmix_Probe( probedata_t *p_data )
141 if( TestMethod( DOWNMIX_METHOD_VAR, "downmix" ) )
146 /* This plugin always works */