git.maemo.org Git - mafwsubrenderer/blob - gst-plugins-base-subtitles0.10/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 /* This does not get you what you think it does, use obj->mixer   */
  34 /* #define GST_ALSA_MIXER(obj)             ((GstAlsaMixer*)(obj)) */
  35
  36 typedef struct _GstAlsaMixer GstAlsaMixer;
  37
  38 typedef enum {
  39   GST_ALSA_MIXER_CAPTURE = 1<<0,
  40   GST_ALSA_MIXER_PLAYBACK = 1<<1,
  41   GST_ALSA_MIXER_ALL = GST_ALSA_MIXER_CAPTURE | GST_ALSA_MIXER_PLAYBACK
  42 } GstAlsaMixerDirection;
  43
  44 /**
  45  * GstAlsaMixer:
  46  *
  47  * Opaque data structure
  48  */
  49 struct _GstAlsaMixer
  50 {
  51   GList *               tracklist;      /* list of available tracks */
  52
  53   snd_mixer_t *         handle;
  54
  55   GstTask *             task;
  56   GStaticRecMutex *     task_mutex;
  57   GStaticRecMutex *     rec_mutex;
  58
  59   int                   pfd[2];
  60
  61   GstMixer *            interface;
  62   gchar *               device;
  63   gchar *               cardname;
  64
  65   GstAlsaMixerDirection dir;
  66 };
  67
  68
  69 GstAlsaMixer*   gst_alsa_mixer_new              (const gchar *device,
  70                                                  GstAlsaMixerDirection dir);
  71 void            gst_alsa_mixer_free             (GstAlsaMixer *mixer);
  72
  73 const GList*    gst_alsa_mixer_list_tracks      (GstAlsaMixer * mixer);
  74 void            gst_alsa_mixer_set_volume       (GstAlsaMixer * mixer,
  75                                                  GstMixerTrack * track,
  76                                                  gint * volumes);
  77 void            gst_alsa_mixer_get_volume       (GstAlsaMixer * mixer,
  78                                                  GstMixerTrack * track,
  79                                                  gint * volumes);
  80 void            gst_alsa_mixer_set_record       (GstAlsaMixer * mixer,
  81                                                  GstMixerTrack * track,
  82                                                  gboolean record);
  83 void            gst_alsa_mixer_set_mute         (GstAlsaMixer * mixer,
  84                                                  GstMixerTrack * track,
  85                                                  gboolean mute);
  86 void            gst_alsa_mixer_set_option       (GstAlsaMixer * mixer,
  87                                                  GstMixerOptions * opts,
  88                                                  gchar * value);
  89 const gchar*    gst_alsa_mixer_get_option       (GstAlsaMixer * mixer,
  90                                                  GstMixerOptions * opts);
  91 void            _gst_alsa_mixer_set_interface   (GstAlsaMixer * mixer,
  92                                                  GstMixer * interface);
  93 GstMixerFlags   gst_alsa_mixer_get_mixer_flags  (GstAlsaMixer *mixer);
  94
  95 #define GST_IMPLEMENT_ALSA_MIXER_METHODS(Type, interface_as_function)           \
  96 static gboolean                                                                 \
  97 interface_as_function ## _supported (Type *this, GType iface_type)              \
  98 {                                                                               \
  99   g_assert (iface_type == GST_TYPE_MIXER);                                      \
 100                                                                                 \
 101   return (this->mixer != NULL);                                                 \
 102 }                                                                               \
 103                                                                                 \
 104 static const GList*                                                             \
 105 interface_as_function ## _list_tracks (GstMixer * mixer)                        \
 106 {                                                                               \
 107   Type *this = (Type*) mixer;                                                   \
 108                                                                                 \
 109   g_return_val_if_fail (this != NULL, NULL);                                    \
 110   g_return_val_if_fail (this->mixer != NULL, NULL);                             \
 111                                                                                 \
 112   return gst_alsa_mixer_list_tracks (this->mixer);                              \
 113 }                                                                               \
 114                                                                                 \
 115 static void                                                                     \
 116 interface_as_function ## _set_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_set_volume (this->mixer, track, volumes);                      \
 125 }                                                                               \
 126                                                                                 \
 127 static void                                                                     \
 128 interface_as_function ## _get_volume (GstMixer * mixer, GstMixerTrack * track,  \
 129     gint * volumes)                                                             \
 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_get_volume (this->mixer, track, volumes);                      \
 137 }                                                                               \
 138                                                                                 \
 139 static void                                                                     \
 140 interface_as_function ## _set_record (GstMixer * mixer, GstMixerTrack * track,  \
 141     gboolean record)                                                            \
 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_record (this->mixer, track, record);                       \
 149 }                                                                               \
 150                                                                                 \
 151 static void                                                                     \
 152 interface_as_function ## _set_mute (GstMixer * mixer, GstMixerTrack * track,    \
 153     gboolean mute)                                                              \
 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_mute (this->mixer, track, mute);                           \
 161 }                                                                               \
 162                                                                                 \
 163 static void                                                                     \
 164 interface_as_function ## _set_option (GstMixer * mixer, GstMixerOptions * opts, \
 165     gchar * value)                                                              \
 166 {                                                                               \
 167   Type *this = (Type*) mixer;                                                   \
 168                                                                                 \
 169   g_return_if_fail (this != NULL);                                              \
 170   g_return_if_fail (this->mixer != NULL);                                       \
 171                                                                                 \
 172   gst_alsa_mixer_set_option (this->mixer, opts, value);                         \
 173 }                                                                               \
 174                                                                                 \
 175 static const gchar*                                                             \
 176 interface_as_function ## _get_option (GstMixer * mixer, GstMixerOptions * opts) \
 177 {                                                                               \
 178   Type *this = (Type*) mixer;                                                   \
 179                                                                                 \
 180   g_return_val_if_fail (this != NULL, NULL);                                    \
 181   g_return_val_if_fail (this->mixer != NULL, NULL);                             \
 182                                                                                 \
 183   return gst_alsa_mixer_get_option (this->mixer, opts);                         \
 184 }                                                                               \
 185                                                                                 \
 186 static GstMixerFlags                                                            \
 187 interface_as_function ## _get_mixer_flags (GstMixer * mixer)                    \
 188 {                                                                               \
 189   Type *this = (Type*) mixer;                                                   \
 190                                                                                 \
 191   g_return_val_if_fail (this != NULL, GST_MIXER_FLAG_NONE);                     \
 192   g_return_val_if_fail (this->mixer != NULL, GST_MIXER_FLAG_NONE);              \
 193                                                                                 \
 194   return gst_alsa_mixer_get_mixer_flags (this->mixer);                          \
 195 }                                                                               \
 196                                                                                 \
 197 static void                                                                     \
 198 interface_as_function ## _interface_init (GstMixerClass * klass)                \
 199 {                                                                               \
 200   GST_MIXER_TYPE (klass) = GST_MIXER_HARDWARE;                                  \
 201                                                                                 \
 202   /* set up the interface hooks */                                              \
 203   klass->list_tracks = interface_as_function ## _list_tracks;                   \
 204   klass->set_volume = interface_as_function ## _set_volume;                     \
 205   klass->get_volume = interface_as_function ## _get_volume;                     \
 206   klass->set_mute = interface_as_function ## _set_mute;                         \
 207   klass->set_record = interface_as_function ## _set_record;                     \
 208   klass->set_option = interface_as_function ## _set_option;                     \
 209   klass->get_option = interface_as_function ## _get_option;                     \
 210   klass->get_mixer_flags = interface_as_function ## _get_mixer_flags;           \
 211 }
 212
 213
 214 G_END_DECLS
 215
 216
 217 #endif /* __GST_ALSA_MIXER_H__ */