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>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int Create ( vlc_object_t
* );
43 static void DoWork ( aout_mixer_t
*, aout_buffer_t
* );
45 /*****************************************************************************
47 *****************************************************************************/
49 set_category( CAT_AUDIO
)
50 set_subcategory( SUBCAT_AUDIO_MISC
)
51 set_description( N_("Dummy S/PDIF audio mixer") )
52 set_capability( "audio mixer", 1 )
53 set_callbacks( Create
, NULL
)
56 /*****************************************************************************
57 * Create: allocate spdif mixer
58 *****************************************************************************/
59 static int Create( vlc_object_t
*p_this
)
61 aout_mixer_t
*p_mixer
= (aout_mixer_t
*)p_this
;
63 if ( !AOUT_FMT_NON_LINEAR(&p_mixer
->fmt
) )
68 p_mixer
->mix
= DoWork
;
69 /* This is a bit kludgy - do not ask for a new buffer, since the one
70 * provided by the first input will be good enough. */
71 p_mixer
->allocation
.b_alloc
= false;
76 /*****************************************************************************
77 * DoWork: mix a new output buffer - this does nothing, indeed
78 *****************************************************************************/
79 static void DoWork( aout_mixer_t
* p_mixer
, aout_buffer_t
* p_buffer
)
81 VLC_UNUSED( p_buffer
);
84 aout_mixer_input_t
* p_input
= p_mixer
->input
[i
];
85 while ( p_input
->is_invalid
)
86 p_input
= p_mixer
->input
[++i
];
88 aout_buffer_t
* p_old_buffer
= aout_FifoPop( NULL
, &p_input
->fifo
);
89 /* We don't free the old buffer because,
90 * The aout core use a hack to avoid useless memcpy: the buffer in which
91 * to mix is the same as the one in the first active input fifo.
92 * So the ownership of that buffer belongs to our caller */
93 assert( p_old_buffer
== p_buffer
);
95 /* Empty other FIFOs to avoid a memory leak. */
96 for ( i
++; i
< p_mixer
->input_count
; i
++ )
98 p_input
= p_mixer
->input
[i
];
99 if ( p_input
->is_invalid
)
101 while ((p_old_buffer
= aout_FifoPop( NULL
, &p_input
->fifo
)))
102 aout_BufferFree( p_old_buffer
);