gstreamer/gst-libs/gst/mixer/mixer.c

/* GStreamer Mixer
 * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
 *
 * mixer.c: mixer design virtual class function wrappers
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "mixer.h"
#include "mixermarshal.h"

enum {
  MUTE_TOGGLED,
  RECORD_TOGGLED,
  VOLUME_CHANGED,
  LAST_SIGNAL
};

static void 	gst_mixer_class_init	(GstMixerClass *klass);

static guint gst_mixer_signals[LAST_SIGNAL] = { 0 };

GType
gst_mixer_get_type (void)
{
  static GType gst_mixer_type = 0;

  if (!gst_mixer_type) {
    static const GTypeInfo gst_mixer_info = {
      sizeof (GstMixerClass),
      (GBaseInitFunc) gst_mixer_class_init,
      NULL,
      NULL,
      NULL,
      NULL,
      0,
      0,
      NULL,
    };

    gst_mixer_type = g_type_register_static (G_TYPE_INTERFACE,
					     "GstMixer",
					     &gst_mixer_info, 0);
    g_type_interface_add_prerequisite (gst_mixer_type,
				       GST_TYPE_IMPLEMENTS_INTERFACE);
  }

  return gst_mixer_type;
}

static void
gst_mixer_class_init (GstMixerClass *klass)
{
  static gboolean initialized = FALSE;
  
  if (!initialized) {
    gst_mixer_signals[RECORD_TOGGLED] =
      g_signal_new ("record_toggled",
		    GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,
		    G_STRUCT_OFFSET (GstMixerClass, record_toggled),
		    NULL, NULL,
		    gst_mixer_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 1,
		    GST_TYPE_MIXER_TRACK, G_TYPE_BOOLEAN);
    gst_mixer_signals[MUTE_TOGGLED] =
      g_signal_new ("mute_toggled",
		    GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,
		    G_STRUCT_OFFSET (GstMixerClass, mute_toggled),
		    NULL, NULL,
		    gst_mixer_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 1,
		    GST_TYPE_MIXER_TRACK, G_TYPE_BOOLEAN);
    gst_mixer_signals[VOLUME_CHANGED] =
      g_signal_new ("volume_changed",
		    GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,
		    G_STRUCT_OFFSET (GstMixerClass, volume_changed),
		    NULL, NULL,
		    gst_mixer_marshal_VOID__OBJECT_POINTER, G_TYPE_NONE, 1,
		    GST_TYPE_MIXER_TRACK, G_TYPE_POINTER);
      
    initialized = TRUE;
  }

  /* default virtual functions */
  klass->list_tracks = NULL;
  klass->set_volume = NULL;
  klass->get_volume = NULL;
  klass->set_mute = NULL;
  klass->set_record = NULL;
}

const GList *
gst_mixer_list_tracks (GstMixer *mixer)
{
  GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->list_tracks) {
    return klass->list_tracks (mixer);
  }

  return NULL;
}

void
gst_mixer_set_volume (GstMixer      *mixer,
		      GstMixerTrack *track,
		      gint          *volumes)
{
  GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->set_volume) {
    klass->set_volume (mixer, track, volumes);
  }
}

void
gst_mixer_get_volume (GstMixer      *mixer,
		      GstMixerTrack *track,
		      gint          *volumes)
{
  GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->get_volume) {
    klass->get_volume (mixer, track, volumes);
  } else {
    gint i;

    for (i = 0; i < track->num_channels; i++) {
      volumes[i] = 0;
    }
  }
}

void
gst_mixer_set_mute (GstMixer      *mixer,
		    GstMixerTrack *track,
		    gboolean       mute)
{
  GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->set_mute) {
    klass->set_mute (mixer, track, mute);
  }
}

void
gst_mixer_set_record (GstMixer      *mixer,
		      GstMixerTrack *track,
		      gboolean       record)
{
  GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);

  if (klass->set_record) {
    klass->set_record (mixer, track, record);
  }
}

void
gst_mixer_mute_toggled (GstMixer      *mixer,
			GstMixerTrack *track,
			gboolean       mute)
{
  g_signal_emit (G_OBJECT (mixer),
		 gst_mixer_signals[MUTE_TOGGLED], 0,
		 track, mute);

  g_signal_emit_by_name (G_OBJECT (track),
			 "mute_toggled",
			 mute);
}

void
gst_mixer_record_toggled (GstMixer      *mixer,
			  GstMixerTrack *track,
			  gboolean       record)
{
  g_signal_emit (G_OBJECT (mixer),
		 gst_mixer_signals[RECORD_TOGGLED], 0,
		 track, record);

  g_signal_emit_by_name (G_OBJECT (track),
			 "record_toggled",
			 record);
}

void
gst_mixer_volume_changed (GstMixer      *mixer,
			  GstMixerTrack *track,
			  gint          *volumes)
{
  g_signal_emit (G_OBJECT (mixer),
		 gst_mixer_signals[VOLUME_CHANGED], 0,
		 track, volumes);

  g_signal_emit_by_name (G_OBJECT (track),
			 "volume_changed",
			 volumes);
}