ext/alsa/gstalsamixer.h

   1 /* ALSA mixer interface implementation.
   2  * Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the Free
  16  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19
  20 #ifndef __GST_ALSA_MIXER_H__
  21 #define __GST_ALSA_MIXER_H__
  22
  23
  24 #include "gstalsa.h"
  25
  26 #include <gst/interfaces/mixer.h>
  27 #include "gstalsamixeroptions.h"
  28 #include "gstalsamixertrack.h"
  29
  30
  31 G_BEGIN_DECLS
  32
  33
  34 #define GST_ALSA_MIXER(obj)             ((GstAlsaMixer*)(obj))
  35
  36
  37 typedef enum {
  38   GST_ALSA_MIXER_CAPTURE = 1<<0,
  39   GST_ALSA_MIXER_PLAYBACK = 1<<1,
  40   GST_ALSA_MIXER_ALL = GST_ALSA_MIXER_CAPTURE | GST_ALSA_MIXER_PLAYBACK
  41 } GstAlsaMixerDirection;
  42
  43
  44 typedef struct _GstAlsaMixer GstAlsaMixer;
  45
  46
  47 struct _GstAlsaMixer {
  48   GList *               tracklist;      /* list of available tracks */
  49
  50   snd_mixer_t *         handle;
  51
  52   gchar *               device;
  53   gchar *               cardname;
  54
  55   GstAlsaMixerDirection dir;
  56 };
  57
  58
  59 GstAlsaMixer*   gst_alsa_mixer_new              (const gchar *device,
  60                                                  GstAlsaMixerDirection dir);
  61 void            gst_alsa_mixer_free             (GstAlsaMixer *mixer);
  62
  63 const GList*    gst_alsa_mixer_list_tracks      (GstAlsaMixer * mixer);
  64 void            gst_alsa_mixer_set_volume       (GstAlsaMixer * mixer,
  65                                                  GstMixerTrack * track,
  66                                                  gint * volumes);
  67 void            gst_alsa_mixer_get_volume       (GstAlsaMixer * mixer,
  68                                                  GstMixerTrack * track,
  69                                                  gint * volumes);
  70 void            gst_alsa_mixer_set_record       (GstAlsaMixer * mixer,
  71                                                  GstMixerTrack * track,
  72                                                  gboolean record);
  73 void            gst_alsa_mixer_set_mute         (GstAlsaMixer * mixer,
  74                                                  GstMixerTrack * track,
  75                                                  gboolean mute);
  76 void            gst_alsa_mixer_set_option       (GstAlsaMixer * mixer,
  77                                                  GstMixerOptions * opts,
  78                                                  gchar * value);
  79 const gchar*    gst_alsa_mixer_get_option       (GstAlsaMixer * mixer,
  80                                                  GstMixerOptions * opts);
  81
  82
  83 #define GST_IMPLEMENT_ALSA_MIXER_METHODS(Type, interface_as_function)           \
  84 static gboolean                                                                 \
  85 interface_as_function ## _supported (Type *this, GType iface_type)              \
  86 {                                                                               \
  87   g_assert (iface_type == GST_TYPE_MIXER);                                      \
  88                                                                                 \
  89   return (this->mixer != NULL);                                                 \
  90 }                                                                               \
  91                                                                                 \
  92 static const GList*                                                             \
  93 interface_as_function ## _list_tracks (GstMixer * mixer)                        \
  94 {                                                                               \
  95   Type *this = (Type*) mixer;                                                   \
  96                                                                                 \
  97   g_return_val_if_fail (this != NULL, NULL);                                    \
  98   g_return_val_if_fail (this->mixer != NULL, NULL);                             \
  99                                                                                 \
 100   return gst_alsa_mixer_list_tracks (this->mixer);                              \
 101 }                                                                               \
 102                                                                                 \
 103 static void                                                                     \
 104 interface_as_function ## _set_volume (GstMixer * mixer, GstMixerTrack * track,  \
 105     gint * volumes)                                                             \
 106 {                                                                               \
 107   Type *this = (Type*) mixer;                                                   \
 108                                                                                 \
 109   g_return_if_fail (this != NULL);                                              \
 110   g_return_if_fail (this->mixer != NULL);                                       \
 111                                                                                 \
 112   gst_alsa_mixer_set_volume (this->mixer, track, volumes);                      \
 113 }                                                                               \
 114                                                                                 \
 115 static void                                                                     \
 116 interface_as_function ## _get_volume (GstMixer * mixer, GstMixerTrack * track,  \
 117     gint * volumes)                                                             \
 118 {                                                                               \
 119   Type *this = (Type*) mixer;                                                   \
 120                                                                                 \
 121   g_return_if_fail (this != NULL);                                              \
 122   g_return_if_fail (this->mixer != NULL);                                       \
 123                                                                                 \
 124   gst_alsa_mixer_get_volume (this->mixer, track, volumes);                      \
 125 }                                                                               \
 126                                                                                 \
 127 static void                                                                     \
 128 interface_as_function ## _set_record (GstMixer * mixer, GstMixerTrack * track,  \
 129     gboolean record)                                                            \
 130 {                                                                               \
 131   Type *this = (Type*) mixer;                                                   \
 132                                                                                 \
 133   g_return_if_fail (this != NULL);                                              \
 134   g_return_if_fail (this->mixer != NULL);                                       \
 135                                                                                 \
 136   gst_alsa_mixer_set_record (this->mixer, track, record);                       \
 137 }                                                                               \
 138                                                                                 \
 139 static void                                                                     \
 140 interface_as_function ## _set_mute (GstMixer * mixer, GstMixerTrack * track,    \
 141     gboolean mute)                                                              \
 142 {                                                                               \
 143   Type *this = (Type*) mixer;                                                   \
 144                                                                                 \
 145   g_return_if_fail (this != NULL);                                              \
 146   g_return_if_fail (this->mixer != NULL);                                       \
 147                                                                                 \
 148   gst_alsa_mixer_set_mute (this->mixer, track, mute);                           \
 149 }                                                                               \
 150                                                                                 \
 151 static void                                                                     \
 152 interface_as_function ## _set_option (GstMixer * mixer, GstMixerOptions * opts, \
 153     gchar * value)                                                              \
 154 {                                                                               \
 155   Type *this = (Type*) mixer;                                                   \
 156                                                                                 \
 157   g_return_if_fail (this != NULL);                                              \
 158   g_return_if_fail (this->mixer != NULL);                                       \
 159                                                                                 \
 160   gst_alsa_mixer_set_option (this->mixer, opts, value);                         \
 161 }                                                                               \
 162                                                                                 \
 163 static const gchar*                                                             \
 164 interface_as_function ## _get_option (GstMixer * mixer, GstMixerOptions * opts) \
 165 {                                                                               \
 166   Type *this = (Type*) mixer;                                                   \
 167                                                                                 \
 168   g_return_val_if_fail (this != NULL, NULL);                                    \
 169   g_return_val_if_fail (this->mixer != NULL, NULL);                             \
 170                                                                                 \
 171   return gst_alsa_mixer_get_option (this->mixer, opts);                         \
 172 }                                                                               \
 173                                                                                 \
 174 static void                                                                     \
 175 interface_as_function ## _interface_init (GstMixerClass * klass)                \
 176 {                                                                               \
 177   GST_MIXER_TYPE (klass) = GST_MIXER_HARDWARE;                                  \
 178                                                                                 \
 179   /* set up the interface hooks */                                              \
 180   klass->list_tracks = interface_as_function ## _list_tracks;                   \
 181   klass->set_volume = interface_as_function ## _set_volume;                     \
 182   klass->get_volume = interface_as_function ## _get_volume;                     \
 183   klass->set_mute = interface_as_function ## _set_mute;                         \
 184   klass->set_record = interface_as_function ## _set_record;                     \
 185   klass->set_option = interface_as_function ## _set_option;                     \
 186   klass->get_option = interface_as_function ## _get_option;                     \
 187 }
 188
 189
 190 G_END_DECLS
 191
 192
 193 #endif /* __GST_ALSA_MIXER_H__ */