gstreamer/ext/alsa/gstalsamixer.h

/* ALSA mixer interface implementation.
 * Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#ifndef __GST_ALSA_MIXER_H__
#define __GST_ALSA_MIXER_H__


#include "gstalsa.h"

#include <gst/interfaces/mixer.h>
#include "gstalsamixeroptions.h"
#include "gstalsamixertrack.h"


G_BEGIN_DECLS

/* This does not get you what you think it does, use obj->mixer   */
/* #define GST_ALSA_MIXER(obj)             ((GstAlsaMixer*)(obj)) */

typedef struct _GstAlsaMixer GstAlsaMixer;

typedef enum {
  GST_ALSA_MIXER_CAPTURE = 1<<0,
  GST_ALSA_MIXER_PLAYBACK = 1<<1,
  GST_ALSA_MIXER_ALL = GST_ALSA_MIXER_CAPTURE | GST_ALSA_MIXER_PLAYBACK
} GstAlsaMixerDirection;

/**
 * GstAlsaMixer:
 *
 * Opaque data structure
 */
struct _GstAlsaMixer
{
  GList *               tracklist;      /* list of available tracks */

  snd_mixer_t *         handle;

  gchar *               device;
  gchar *               cardname;

  GstAlsaMixerDirection dir;
};


GstAlsaMixer*   gst_alsa_mixer_new              (const gchar *device,
                                                 GstAlsaMixerDirection dir);
void            gst_alsa_mixer_free             (GstAlsaMixer *mixer);

const GList*    gst_alsa_mixer_list_tracks      (GstAlsaMixer * mixer);
void            gst_alsa_mixer_set_volume       (GstAlsaMixer * mixer,
                                                 GstMixerTrack * track,
                                                 gint * volumes);
void            gst_alsa_mixer_get_volume       (GstAlsaMixer * mixer,
                                                 GstMixerTrack * track,
                                                 gint * volumes);
void            gst_alsa_mixer_set_record       (GstAlsaMixer * mixer,
                                                 GstMixerTrack * track,
                                                 gboolean record);
void            gst_alsa_mixer_set_mute         (GstAlsaMixer * mixer,
                                                 GstMixerTrack * track,
                                                 gboolean mute);
void            gst_alsa_mixer_set_option       (GstAlsaMixer * mixer,
                                                 GstMixerOptions * opts,
                                                 gchar * value);
const gchar*    gst_alsa_mixer_get_option       (GstAlsaMixer * mixer,
                                                 GstMixerOptions * opts);


#define GST_IMPLEMENT_ALSA_MIXER_METHODS(Type, interface_as_function)           \
static gboolean                                                                 \
interface_as_function ## _supported (Type *this, GType iface_type)              \
{                                                                               \
  g_assert (iface_type == GST_TYPE_MIXER);                                      \
                                                                                \
  return (this->mixer != NULL);                                                 \
}                                                                               \
                                                                                \
static const GList*                                                             \
interface_as_function ## _list_tracks (GstMixer * mixer)                        \
{                                                                               \
  Type *this = (Type*) mixer;                                                   \
                                                                                \
  g_return_val_if_fail (this != NULL, NULL);                                    \
  g_return_val_if_fail (this->mixer != NULL, NULL);                             \
                                                                                \
  return gst_alsa_mixer_list_tracks (this->mixer);                              \
}                                                                               \
                                                                                \
static void                                                                     \
interface_as_function ## _set_volume (GstMixer * mixer, GstMixerTrack * track,  \
    gint * volumes)                                                             \
{                                                                               \
  Type *this = (Type*) mixer;                                                   \
                                                                                \
  g_return_if_fail (this != NULL);                                              \
  g_return_if_fail (this->mixer != NULL);                                       \
                                                                                \
  gst_alsa_mixer_set_volume (this->mixer, track, volumes);                      \
}                                                                               \
                                                                                \
static void                                                                     \
interface_as_function ## _get_volume (GstMixer * mixer, GstMixerTrack * track,  \
    gint * volumes)                                                             \
{                                                                               \
  Type *this = (Type*) mixer;                                                   \
                                                                                \
  g_return_if_fail (this != NULL);                                              \
  g_return_if_fail (this->mixer != NULL);                                       \
                                                                                \
  gst_alsa_mixer_get_volume (this->mixer, track, volumes);                      \
}                                                                               \
                                                                                \
static void                                                                     \
interface_as_function ## _set_record (GstMixer * mixer, GstMixerTrack * track,  \
    gboolean record)                                                            \
{                                                                               \
  Type *this = (Type*) mixer;                                                   \
                                                                                \
  g_return_if_fail (this != NULL);                                              \
  g_return_if_fail (this->mixer != NULL);                                       \
                                                                                \
  gst_alsa_mixer_set_record (this->mixer, track, record);                       \
}                                                                               \
                                                                                \
static void                                                                     \
interface_as_function ## _set_mute (GstMixer * mixer, GstMixerTrack * track,    \
    gboolean mute)                                                              \
{                                                                               \
  Type *this = (Type*) mixer;                                                   \
                                                                                \
  g_return_if_fail (this != NULL);                                              \
  g_return_if_fail (this->mixer != NULL);                                       \
                                                                                \
  gst_alsa_mixer_set_mute (this->mixer, track, mute);                           \
}                                                                               \
                                                                                \
static void                                                                     \
interface_as_function ## _set_option (GstMixer * mixer, GstMixerOptions * opts, \
    gchar * value)                                                              \
{                                                                               \
  Type *this = (Type*) mixer;                                                   \
                                                                                \
  g_return_if_fail (this != NULL);                                              \
  g_return_if_fail (this->mixer != NULL);                                       \
                                                                                \
  gst_alsa_mixer_set_option (this->mixer, opts, value);                         \
}                                                                               \
                                                                                \
static const gchar*                                                             \
interface_as_function ## _get_option (GstMixer * mixer, GstMixerOptions * opts) \
{                                                                               \
  Type *this = (Type*) mixer;                                                   \
                                                                                \
  g_return_val_if_fail (this != NULL, NULL);                                    \
  g_return_val_if_fail (this->mixer != NULL, NULL);                             \
                                                                                \
  return gst_alsa_mixer_get_option (this->mixer, opts);                         \
}                                                                               \
                                                                                \
static void                                                                     \
interface_as_function ## _interface_init (GstMixerClass * klass)                \
{                                                                               \
  GST_MIXER_TYPE (klass) = GST_MIXER_HARDWARE;                                  \
                                                                                \
  /* set up the interface hooks */                                              \
  klass->list_tracks = interface_as_function ## _list_tracks;                   \
  klass->set_volume = interface_as_function ## _set_volume;                     \
  klass->get_volume = interface_as_function ## _get_volume;                     \
  klass->set_mute = interface_as_function ## _set_mute;                         \
  klass->set_record = interface_as_function ## _set_record;                     \
  klass->set_option = interface_as_function ## _set_option;                     \
  klass->get_option = interface_as_function ## _get_option;                     \
}


G_END_DECLS


#endif /* __GST_ALSA_MIXER_H__ */