modules/audio_output/adummy.c

   1 /*****************************************************************************
   2  * adummy.c : dummy audio output plugin
   3  *****************************************************************************
   4  * Copyright (C) 2002 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <vlc_common.h>
  29 #include <vlc_plugin.h>
  30 #include <vlc_aout.h>
  31 #include <vlc_cpu.h>
  32
  33 static int Open( vlc_object_t * p_this );
  34
  35 vlc_module_begin ()
  36     set_shortname( N_("Dummy") )
  37     set_description( N_("Dummy audio output") )
  38     set_capability( "audio output", 0 )
  39     set_callbacks( Open, NULL )
  40     add_shortcut( "dummy" )
  41 vlc_module_end ()
  42
  43 #define A52_FRAME_NB 1536
  44
  45 static void Play(audio_output_t *aout, block_t *block)
  46 {
  47     block_Release( block );
  48     (void) aout;
  49 }
  50
  51 static void Flush(audio_output_t *aout, bool wait)
  52 {
  53     (void) aout; (void) wait;
  54 }
  55
  56 static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
  57 {
  58     if (aout_FormatNbChannels(fmt) == 0)
  59         return VLC_EGENERIC;
  60
  61     if (AOUT_FMT_SPDIF(fmt) && var_InheritBool(aout, "spdif"))
  62     {
  63         fmt->i_format = VLC_CODEC_SPDIFL;
  64         fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
  65         fmt->i_frame_length = A52_FRAME_NB;
  66     }
  67     else
  68         fmt->i_format = HAVE_FPU ? VLC_CODEC_FL32 : VLC_CODEC_S16N;
  69
  70     fmt->channel_type = AUDIO_CHANNEL_TYPE_BITMAP;
  71     return VLC_SUCCESS;
  72 }
  73
  74 static int Open(vlc_object_t *obj)
  75 {
  76     audio_output_t *aout = (audio_output_t *)obj;
  77
  78     aout->start = Start;
  79     aout->time_get = NULL;
  80     aout->play = Play;
  81     aout->pause = NULL;
  82     aout->flush = Flush;
  83     aout->stop = NULL;
  84     aout->volume_set = NULL;
  85     aout->mute_set = NULL;
  86     return VLC_SUCCESS;
  87 }