1 /*****************************************************************************
2 * spdif.c : dummy mixer for S/PDIF output (1 input only)
3 *****************************************************************************
4 * Copyright (C) 2002 the VideoLAN team
7 * Authors: Christophe Massiot <massiot@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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
37 #include <vlc_aout_mixer.h>
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Create ( vlc_object_t * );
44 static void DoWork ( aout_mixer_t *, aout_buffer_t * );
46 /*****************************************************************************
48 *****************************************************************************/
50 set_category( CAT_AUDIO )
51 set_subcategory( SUBCAT_AUDIO_MISC )
52 set_description( N_("Dummy S/PDIF audio mixer") )
53 set_capability( "audio mixer", 1 )
54 set_callbacks( Create, NULL )
57 /*****************************************************************************
58 * Create: allocate spdif mixer
59 *****************************************************************************/
60 static int Create( vlc_object_t *p_this )
62 aout_mixer_t *p_mixer = (aout_mixer_t *)p_this;
64 if ( !AOUT_FMT_NON_LINEAR(&p_mixer->fmt) )
69 p_mixer->mix = DoWork;
70 /* This is a bit kludgy - do not ask for a new buffer, since the one
71 * provided by the first input will be good enough. */
72 p_mixer->allocation.b_alloc = false;
77 /*****************************************************************************
78 * DoWork: mix a new output buffer - this does nothing, indeed
79 *****************************************************************************/
80 static void DoWork( aout_mixer_t * p_mixer, aout_buffer_t * p_buffer )
82 VLC_UNUSED( p_buffer );
84 aout_mixer_input_t * p_input = p_mixer->input;
86 aout_buffer_t * p_old_buffer = aout_FifoPop( NULL, &p_input->fifo );
87 /* We don't free the old buffer because,
88 * The aout core use a hack to avoid useless memcpy: the buffer in which
89 * to mix is the same as the one in the first active input fifo.
90 * So the ownership of that buffer belongs to our caller */
91 assert( p_old_buffer == p_buffer );