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     float stepSize = var_InheritFloat (pl, "volume-step") / (float)AOUT_VOLUME_DEFAULT;
  82
  83     float delta = value * stepSize;
  84
  85     audio_output_t *aout = playlist_GetAout (pl);
  86     if (aout != NULL)
  87     {
  88         float vol = aout_VolumeGet (aout);
  89         if (vol >= 0.)
  90         {
  91             vol += delta;
  92             if (vol < 0.)
  93                 vol = 0.;
  94             if (vol > 2.)
  95                 vol = 2.;
  96             vol = (roundf (vol / stepSize)) * stepSize;
  97             if (volp != NULL)
  98                 *volp = vol;
  99             ret = aout_VolumeSet (aout, vol);
 100         }
 101         vlc_object_release (aout);
 102     }
 103     return ret;
 104 }
 105
 106 int playlist_MuteGet (playlist_t *pl)
 107 {
 108     int mute = -1;
 109
 110     audio_output_t *aout = playlist_GetAout (pl);
 111     if (aout != NULL)
 112     {
 113         mute = aout_MuteGet (aout);
 114         vlc_object_release (aout);
 115     }
 116     return mute;
 117 }
 118
 119 int playlist_MuteSet (playlist_t *pl, bool mute)
 120 {
 121     int ret = -1;
 122
 123     audio_output_t *aout = playlist_GetAout (pl);
 124     if (aout != NULL)
 125     {
 126         ret = aout_MuteSet (aout, mute);
 127         vlc_object_release (aout);
 128     }
 129     return ret;
 130 }
 131
 132 void playlist_EnableAudioFilter (playlist_t *pl, const char *name, bool add)
 133 {
 134     audio_output_t *aout = playlist_GetAout (pl);
 135
 136     aout_ChangeFilterString (VLC_OBJECT(pl), VLC_OBJECT(aout),
 137                              "audio-filter", name, add);
 138     if (aout != NULL)
 139         vlc_object_release (aout);
 140 }