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

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/* 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;
}
klass->mixer_type = GST_MIXER_SOFTWARE;
/* default virtual functions */
klass->list_tracks = NULL;
klass->set_volume = NULL;
klass->get_volume = NULL;
klass->set_mute = NULL;
klass->set_record = NULL;
}
/**
*agst_mixer_list_tracks:
* @mixer: the #GstMixer (a #GstElement) to get the tracks from.
*
* Returns a list of avialable tracks for this mixer/element. Note
* that it is allowed for sink (output) elements to only provide
* the output tracks in this list. Likewise, for sources (inputs),
* it is allowed to only provide input elements in this list.
*
* Returns: A #GList consisting of zero or more #GstMixerTracks.
*/
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;
}
/**
* gst_mixer_set_volume:
* @mixer: The #GstMixer (a #GstElement) that owns the track.
* @track: The #GstMixerTrack to set the volume on.
* @volumes: an array of integers (of size track->num_channels)
* that gives the wanted volume for each channel in
* this track.
*
* Sets the volume on each channel in a track. Short note about
* naming: a track is defined as one separate stream owned by
* the mixer/element, such as 'Line-in' or 'Microphone'. A
* channel is said to be a mono-stream inside this track. A
* stereo track thus contains two channels.
*/
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);
}
}
/*
* gst_mixer_get_volume:
* @mixer: the #GstMixer (a #GstElement) that owns the track
* @track: the GstMixerTrack to get the volume from.
* @volumes: a pre-allocated array of integers (of size
* track->num_channels) to store the current volume
* of each channel in the given track in.
*
* Get the current volume(s) on the given track.
*/
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;
}
}
}
/**
* gst_mixer_set_mute:
* @mixer: the #GstMixer (a #GstElement) that owns the track.
* @track: the #GstMixerTrack to operate on.
* @mute: a boolean value indicating whether to turn on or off
* muting.
*
* Mutes or unmutes the given channel. To find out whether a
* track is currently muted, use GST_MIXER_TRACK_HAS_FLAG ().
*/
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);
}
}
/**
* gst_mixer_set_record:
* @mixer: The #GstMixer (a #GstElement) that owns the track.
* @track: the #GstMixerTrack to operate on.
* @record: a boolean value that indicates whether to turn on
* or off recording.
*
* Enables or disables recording on the given track. Note that
* this is only possible on input tracks, not on output tracks
* (see GST_MIXER_TRACK_HAS_FLAG () and the GST_MIXER_TRACK_INPUT
* flag).
*/
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);
}