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, vlc_tick_t date)
  46 {
  47     block_Release( block );
  48     (void) aout; (void) date;
  49 }
  50
  51 static void Pause(audio_output_t *aout, bool paused, vlc_tick_t date)
  52 {
  53     (void) aout; (void) paused; (void) date;
  54 }
  55
  56 static void Flush(audio_output_t *aout, bool wait)
  57 {
  58     (void) aout; (void) wait;
  59 }
  60
  61 static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
  62 {
  63     (void) aout;
  64
  65     switch (fmt->i_format)
  66     {
  67         case VLC_CODEC_A52:
  68         case VLC_CODEC_EAC3:
  69             fmt->i_format = VLC_CODEC_SPDIFL;
  70             fmt->i_bytes_per_frame = 4;
  71             fmt->i_frame_length = 1;
  72             break;
  73         case VLC_CODEC_DTS:
  74         case VLC_CODEC_TRUEHD:
  75         case VLC_CODEC_MLP:
  76             fmt->i_format = VLC_CODEC_SPDIFL;
  77             fmt->i_rate = 768000;
  78             fmt->i_bytes_per_frame = 16;
  79             fmt->i_frame_length = 1;
  80             break;
  81         default:
  82             assert(AOUT_FMT_LINEAR(fmt));
  83             assert(aout_FormatNbChannels(fmt) > 0);
  84             fmt->i_format = HAVE_FPU ? VLC_CODEC_FL32 : VLC_CODEC_S16N;
  85             fmt->channel_type = AUDIO_CHANNEL_TYPE_BITMAP;
  86             break;
  87     }
  88
  89     return VLC_SUCCESS;
  90 }
  91
  92 static int Open(vlc_object_t *obj)
  93 {
  94     audio_output_t *aout = (audio_output_t *)obj;
  95
  96     aout->start = Start;
  97     aout->time_get = aout_TimeGetDefault;
  98     aout->play = Play;
  99     aout->pause = Pause;
 100     aout->flush = Flush;
 101     aout->stop = NULL;
 102     aout->volume_set = NULL;
 103     aout->mute_set = NULL;
 104     return VLC_SUCCESS;
 105 }