src/playlist/aout.c

   1 /*****************************************************************************
   2  * aout.c: audio output controls for the VLC playlist
   3  *****************************************************************************
   4  * Copyright (C) 2002-2012 VLC authors and VideoLAN
   5  *
   6  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include "config.h"
  25 #endif
  26
  27 #include <math.h>
  28
  29 #include <vlc_common.h>
  30 #include <vlc_aout.h>
  31 #include <vlc_playlist.h>
  32
  33 #include "../audio_output/aout_internal.h"
  34 #include "playlist_internal.h"
  35
  36 audio_output_t *playlist_GetAout(playlist_t *pl)
  37 {
  38     /* NOTE: it is assumed that the input resource exists. In practice,
  39      * the playlist must have been activated. This is automatic when calling
  40      * pl_Get(). FIXME: input resources are deleted at deactivation, this can
  41      * be too early. */
  42     playlist_private_t *sys = pl_priv(pl);
  43     return input_resource_HoldAout(sys->p_input_resource);
  44 }
  45
  46 float playlist_VolumeGet (playlist_t *pl)
  47 {
  48     float volume = -1.f;
  49
  50     audio_output_t *aout = playlist_GetAout (pl);
  51     if (aout != NULL)
  52     {
  53         volume = aout_VolumeGet (aout);
  54         vlc_object_release (aout);
  55     }
  56     return volume;
  57 }
  58
  59 int playlist_VolumeSet (playlist_t *pl, float vol)
  60 {
  61     int ret = -1;
  62
  63     audio_output_t *aout = playlist_GetAout (pl);
  64     if (aout != NULL)
  65     {
  66         ret = aout_VolumeSet (aout, vol);
  67         vlc_object_release (aout);
  68     }
  69     return ret;
  70 }
  71
  72 /**
  73  * Raises the volume.
  74  * \param value how much to increase (> 0) or decrease (< 0) the volume
  75  * \param volp if non-NULL, will contain contain the resulting volume
  76  */
  77 int playlist_VolumeUp (playlist_t *pl, int value, float *volp)
  78 {
  79     int ret = -1;
  80
  81     audio_output_t *aout = playlist_GetAout (pl);
  82     if (aout != NULL)
  83     {
  84         ret = aout_VolumeUpdate (aout, value, volp);
  85         vlc_object_release (aout);
  86     }
  87     return ret;
  88 }
  89
  90 int playlist_MuteGet (playlist_t *pl)
  91 {
  92     int mute = -1;
  93
  94     audio_output_t *aout = playlist_GetAout (pl);
  95     if (aout != NULL)
  96     {
  97         mute = aout_MuteGet (aout);
  98         vlc_object_release (aout);
  99     }
 100     return mute;
 101 }
 102
 103 int playlist_MuteSet (playlist_t *pl, bool mute)
 104 {
 105     int ret = -1;
 106
 107     audio_output_t *aout = playlist_GetAout (pl);
 108     if (aout != NULL)
 109     {
 110         ret = aout_MuteSet (aout, mute);
 111         vlc_object_release (aout);
 112     }
 113     return ret;
 114 }
 115
 116 void playlist_EnableAudioFilter (playlist_t *pl, const char *name, bool add)
 117 {
 118     audio_output_t *aout = playlist_GetAout (pl);
 119
 120     aout_ChangeFilterString (VLC_OBJECT(pl), aout ? VLC_OBJECT(aout) : NULL,
 121                              "audio-filter", name, add);
 122     if (aout != NULL)
 123         vlc_object_release (aout);
 124 }