Add a growl (http://growl.info/) notification plugin (most of code from msn.c)
[vlc.git] / modules / audio_filter / channel_mixer / simple.c
1 /*****************************************************************************
2  * simple.c : simple channel mixer plug-in (only 7/7.1/5/5.1 -> Stereo for now)
3  *****************************************************************************
4  * Copyright (C) 2002 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Gildas Bazin <gbazin@videolan.org>
8  *
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.
13  *
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.
18  *
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <stdlib.h>                                      /* malloc(), free() */
28 #include <string.h>
29
30 #include <vlc/vlc.h>
31 #include "audio_output.h"
32 #include "aout_internal.h"
33
34 /*****************************************************************************
35  * Local prototypes
36  *****************************************************************************/
37 static int  Create    ( vlc_object_t * );
38
39 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
40                         aout_buffer_t * );
41
42 /*****************************************************************************
43  * Module descriptor
44  *****************************************************************************/
45 vlc_module_begin();
46     set_description( _("audio filter for simple channel mixing") );
47     set_capability( "audio filter", 10 );
48     set_category( CAT_AUDIO );
49     set_subcategory( SUBCAT_AUDIO_MISC );
50     set_callbacks( Create, NULL );
51 vlc_module_end();
52
53 /*****************************************************************************
54  * Create: allocate trivial channel mixer
55  *****************************************************************************/
56 static int Create( vlc_object_t *p_this )
57 {
58     aout_filter_t * p_filter = (aout_filter_t *)p_this;
59
60     if ( (p_filter->input.i_physical_channels
61            == p_filter->output.i_physical_channels
62            && p_filter->input.i_original_channels
63                == p_filter->output.i_original_channels)
64           || p_filter->input.i_format != p_filter->output.i_format
65           || p_filter->input.i_rate != p_filter->output.i_rate
66           || p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
67     {
68         return -1;
69     }
70
71     /* Only conversion to Stereo right now */
72     if( p_filter->output.i_physical_channels !=
73         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) ) return -1;
74
75     /* Only from 7/7.1/5/5.1 */
76     if( (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
77         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
78          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
79         (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
80         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
81          AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
82          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) )
83     {
84         return -1;
85     }
86
87     p_filter->pf_do_work = DoWork;
88     p_filter->b_in_place = 0;
89
90     return 0;
91 }
92
93 /*****************************************************************************
94  * DoWork: convert a buffer
95  *****************************************************************************/
96 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
97                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
98 {
99     int i_input_nb = aout_FormatNbChannels( &p_filter->input );
100     int i_output_nb = aout_FormatNbChannels( &p_filter->output );
101     float *p_dest = (float *)p_out_buf->p_buffer;
102     float *p_src = (float *)p_in_buf->p_buffer;
103     int i;
104
105     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
106     p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes * i_output_nb / i_input_nb;
107
108     if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
109     for( i = p_in_buf->i_nb_samples; i--; )
110     {
111         *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
112         p_dest++;
113         *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
114         p_dest++;
115
116         p_src += 7;
117
118         if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
119     }
120     else
121     for( i = p_in_buf->i_nb_samples; i--; )
122     {
123         *p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
124         p_dest++;
125         *p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
126         p_dest++;
127
128         p_src += 5;
129
130         if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
131     }
132 }