src/control/audio.c

   1 /*****************************************************************************
   2  * libvlc_audio.c: New libvlc audio control API
   3  *****************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Filippo Carone <filippo@carone.org>
   8  *          Jean-Paul Saman <jpsaman _at_ m2x _dot_ nl>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #include "libvlc_internal.h"
  26 #include <vlc/libvlc.h>
  27
  28 #include <vlc_input.h>
  29 #include <vlc_aout.h>
  30
  31
  32 /*
  33  * Remember to release the returned aout_instance_t since it is locked at
  34  * the end of this function.
  35  */
  36 static aout_instance_t *GetAOut( libvlc_instance_t *p_instance,
  37                                  libvlc_exception_t *p_exception )
  38 {
  39     aout_instance_t * p_aout = NULL;
  40
  41     p_aout = vlc_object_find( p_instance->p_libvlc_int, VLC_OBJECT_AOUT, FIND_CHILD );
  42     if( !p_aout )
  43     {
  44         libvlc_exception_raise( p_exception, "No active audio output" );
  45         return NULL;
  46     }
  47
  48     return p_aout;
  49 }
  50
  51
  52 /*****************************************************************************
  53  * libvlc_audio_get_mute : Get the volume state, true if muted
  54  *****************************************************************************/
  55 void libvlc_audio_toggle_mute( libvlc_instance_t *p_instance,
  56                                libvlc_exception_t *p_e )
  57 {
  58     VLC_UNUSED(p_e);
  59
  60     aout_VolumeMute( p_instance->p_libvlc_int, NULL );
  61 }
  62
  63 int libvlc_audio_get_mute( libvlc_instance_t *p_instance,
  64                            libvlc_exception_t *p_e )
  65 {
  66     /*
  67      * If the volume level is 0, then the channel is muted
  68      */
  69     audio_volume_t i_volume;
  70
  71     i_volume = libvlc_audio_get_volume(p_instance, p_e);
  72     if ( i_volume == 0 )
  73         return true;
  74     return false;
  75 }
  76
  77 void libvlc_audio_set_mute( libvlc_instance_t *p_instance, int mute,
  78                             libvlc_exception_t *p_e )
  79 {
  80     if ( mute ^ libvlc_audio_get_mute( p_instance, p_e ) )
  81     {
  82         aout_VolumeMute( p_instance->p_libvlc_int, NULL );
  83     }
  84 }
  85
  86 /*****************************************************************************
  87  * libvlc_audio_get_volume : Get the current volume (range 0-200 %)
  88  *****************************************************************************/
  89 int libvlc_audio_get_volume( libvlc_instance_t *p_instance,
  90                              libvlc_exception_t *p_e )
  91 {
  92     VLC_UNUSED(p_e);
  93
  94     audio_volume_t i_volume;
  95
  96     aout_VolumeGet( p_instance->p_libvlc_int, &i_volume );
  97
  98     return (i_volume*200+AOUT_VOLUME_MAX/2)/AOUT_VOLUME_MAX;
  99 }
 100
 101
 102 /*****************************************************************************
 103  * libvlc_audio_set_volume : Set the current volume
 104  *****************************************************************************/
 105 void libvlc_audio_set_volume( libvlc_instance_t *p_instance, int i_volume,
 106                               libvlc_exception_t *p_e )
 107 {
 108     if( i_volume >= 0 && i_volume <= 200 )
 109     {
 110         i_volume = (i_volume * AOUT_VOLUME_MAX + 100) / 200;
 111
 112         aout_VolumeSet( p_instance->p_libvlc_int, i_volume );
 113     }
 114     else
 115     {
 116         libvlc_exception_raise( p_e, "Volume out of range" );
 117     }
 118 }
 119
 120 /*****************************************************************************
 121  * libvlc_audio_get_track_count : Get the number of available audio tracks
 122  *****************************************************************************/
 123 int libvlc_audio_get_track_count( libvlc_media_player_t *p_mi,
 124                                   libvlc_exception_t *p_e )
 125 {
 126     input_thread_t *p_input_thread = libvlc_get_input_thread( p_mi, p_e );
 127     vlc_value_t val_list;
 128
 129     if( !p_input_thread )
 130         return -1;
 131
 132     var_Change( p_input_thread, "audio-es", VLC_VAR_GETCHOICES, &val_list, NULL );
 133     vlc_object_release( p_input_thread );
 134     return val_list.p_list->i_count;
 135 }
 136
 137 /*****************************************************************************
 138  * libvlc_audio_get_track : Get the current audio track
 139  *****************************************************************************/
 140 int libvlc_audio_get_track( libvlc_media_player_t *p_mi,
 141                             libvlc_exception_t *p_e )
 142 {
 143     input_thread_t *p_input_thread = libvlc_get_input_thread( p_mi, p_e );
 144     vlc_value_t val_list;
 145     vlc_value_t val;
 146     int i_track = -1;
 147     int i_ret = -1;
 148     int i;
 149
 150     if( !p_input_thread )
 151         return -1;
 152
 153     i_ret = var_Get( p_input_thread, "audio-es", &val );
 154     if( i_ret < 0 )
 155     {
 156         libvlc_exception_raise( p_e, "Getting Audio track information failed" );
 157         vlc_object_release( p_input_thread );
 158         return i_ret;
 159     }
 160
 161     var_Change( p_input_thread, "audio-es", VLC_VAR_GETCHOICES, &val_list, NULL );
 162     for( i = 0; i < val_list.p_list->i_count; i++ )
 163     {
 164         vlc_value_t track_val = val_list.p_list->p_values[i];
 165         if( track_val.i_int == val.i_int )
 166         {
 167             i_track = i;
 168             break;
 169        }
 170     }
 171     vlc_object_release( p_input_thread );
 172     return i_track;
 173 }
 174
 175
 176 /*****************************************************************************
 177  * libvlc_audio_set_track : Set the current audio track
 178  *****************************************************************************/
 179 void libvlc_audio_set_track( libvlc_media_player_t *p_mi, int i_track,
 180                              libvlc_exception_t *p_e )
 181 {
 182     input_thread_t *p_input_thread = libvlc_get_input_thread( p_mi, p_e );
 183     vlc_value_t val_list;
 184     int i_ret = -1;
 185     int i;
 186
 187     if( !p_input_thread )
 188         return;
 189
 190     var_Change( p_input_thread, "audio-es", VLC_VAR_GETCHOICES, &val_list, NULL );
 191     for( i = 0; i < val_list.p_list->i_count; i++ )
 192     {
 193         vlc_value_t val = val_list.p_list->p_values[i];
 194         if( i_track == val.i_int )
 195         {
 196             i_ret = var_Set( p_input_thread, "audio-es", val );
 197             if( i_ret < 0 )
 198             {
 199                 libvlc_exception_raise( p_e, "Setting audio track failed" );
 200             }
 201             vlc_object_release( p_input_thread );
 202             return;
 203         }
 204     }
 205     libvlc_exception_raise( p_e, "Audio track out of range" );
 206     vlc_object_release( p_input_thread );
 207 }
 208
 209 /*****************************************************************************
 210  * libvlc_audio_get_channel : Get the current audio channel
 211  *****************************************************************************/
 212 int libvlc_audio_get_channel( libvlc_instance_t *p_instance,
 213                                 libvlc_exception_t *p_e )
 214 {
 215     aout_instance_t *p_aout = GetAOut( p_instance, p_e );
 216     if( p_aout )
 217     {
 218         vlc_value_t val;
 219
 220         var_Get( p_aout, "audio-channels", &val );
 221         vlc_object_release( p_aout );
 222         return val.i_int;
 223     }
 224     return -1;
 225 }
 226
 227 /*****************************************************************************
 228  * libvlc_audio_set_channel : Set the current audio channel
 229  *****************************************************************************/
 230 void libvlc_audio_set_channel( libvlc_instance_t *p_instance, int i_channel,
 231                                libvlc_exception_t *p_e )
 232 {
 233     aout_instance_t *p_aout = GetAOut( p_instance, p_e );
 234     if( p_aout )
 235     {
 236         vlc_value_t val;
 237         int i_ret = -1;
 238
 239         val.i_int = i_channel;
 240         switch( i_channel )
 241         {
 242             case AOUT_VAR_CHAN_RSTEREO:
 243             case AOUT_VAR_CHAN_STEREO:
 244             case AOUT_VAR_CHAN_LEFT:
 245             case AOUT_VAR_CHAN_RIGHT:
 246             case AOUT_VAR_CHAN_DOLBYS:
 247                 i_ret = var_Set( p_aout, "audio-channels", val );
 248                 if( i_ret < 0 )
 249                 {
 250                     libvlc_exception_raise( p_e, "Failed setting audio channel" );
 251                     vlc_object_release( p_aout );
 252                     return;
 253                 }
 254                 vlc_object_release( p_aout );
 255                 return; /* Found */
 256             default:
 257                 libvlc_exception_raise( p_e, "Audio channel out of range" );
 258                 break;
 259         }
 260         vlc_object_release( p_aout );
 261     }
 262 }