mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-03 16:09:39 +00:00
7cf4ab6229
By passing `NULL` to `g_signal_new` instead of a marshaller, GLib will actually internally optimize the signal (if the marshaller is available in GLib itself) by also setting the valist marshaller. This makes the signal emission a bit more performant than the regular marshalling, which still needs to box into `GValue` and call libffi in case of a generic marshaller. Note that for custom marshallers, one would use `g_signal_set_va_marshaller()` with the valist marshaller instead.
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/* GStreamer Tuner
|
|
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
|
|
*
|
|
* tunerchannel.c: tuner channel object design
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "tunerchannel.h"
|
|
|
|
/**
|
|
* SECTION:gsttunerchannel
|
|
* @title: GstTunerChannel
|
|
* @short_description: A channel from an element implementing the #GstTuner
|
|
* interface.
|
|
*
|
|
* The #GstTunerChannel object is provided by an element implementing
|
|
* the #GstTuner interface.
|
|
*
|
|
* GstTunerChannel provides a name and flags to determine the type and
|
|
* capabilities of the channel. If the GST_TUNER_CHANNEL_FREQUENCY flag is
|
|
* set, then the channel also information about the minimum and maximum
|
|
* frequency, and range of the reported signal strength.
|
|
*/
|
|
|
|
enum
|
|
{
|
|
/* FILL ME */
|
|
SIGNAL_FREQUENCY_CHANGED,
|
|
SIGNAL_SIGNAL_CHANGED,
|
|
LAST_SIGNAL
|
|
};
|
|
|
|
G_DEFINE_TYPE (GstTunerChannel, gst_tuner_channel, G_TYPE_OBJECT);
|
|
|
|
static void gst_tuner_channel_dispose (GObject * object);
|
|
|
|
static guint signals[LAST_SIGNAL] = { 0 };
|
|
|
|
static void
|
|
gst_tuner_channel_class_init (GstTunerChannelClass * klass)
|
|
{
|
|
GObjectClass *object_klass = (GObjectClass *) klass;
|
|
|
|
/**
|
|
* GstTunerChannel::frequency-changed:
|
|
* @tunerchannel: The #GstTunerChannel
|
|
* @frequency: The new frequency (an unsigned long)
|
|
*
|
|
* Reports that the current frequency has changed.
|
|
*/
|
|
signals[SIGNAL_FREQUENCY_CHANGED] =
|
|
g_signal_new ("frequency-changed", G_TYPE_FROM_CLASS (klass),
|
|
G_SIGNAL_RUN_LAST,
|
|
G_STRUCT_OFFSET (GstTunerChannelClass, frequency_changed),
|
|
NULL, NULL, NULL, G_TYPE_NONE, 1, G_TYPE_ULONG);
|
|
/**
|
|
* GstTunerChannel::signal-changed:
|
|
* @tunerchannel: The #GstTunerChannel
|
|
* @signal: The new signal strength (an integer)
|
|
*
|
|
* Reports that the signal strength has changed.
|
|
*
|
|
* See Also: gst_tuner_signal_strength()
|
|
*/
|
|
signals[SIGNAL_SIGNAL_CHANGED] =
|
|
g_signal_new ("signal-changed", G_TYPE_FROM_CLASS (klass),
|
|
G_SIGNAL_RUN_LAST,
|
|
G_STRUCT_OFFSET (GstTunerChannelClass, signal_changed),
|
|
NULL, NULL, NULL, G_TYPE_NONE, 1, G_TYPE_INT);
|
|
|
|
object_klass->dispose = gst_tuner_channel_dispose;
|
|
}
|
|
|
|
static void
|
|
gst_tuner_channel_init (GstTunerChannel * channel)
|
|
{
|
|
channel->label = NULL;
|
|
channel->flags = 0;
|
|
channel->min_frequency = channel->max_frequency = 0;
|
|
channel->min_signal = channel->max_signal = 0;
|
|
}
|
|
|
|
static void
|
|
gst_tuner_channel_dispose (GObject * object)
|
|
{
|
|
GstTunerChannel *channel = GST_TUNER_CHANNEL (object);
|
|
|
|
if (channel->label) {
|
|
g_free (channel->label);
|
|
channel->label = NULL;
|
|
}
|
|
|
|
G_OBJECT_CLASS (gst_tuner_channel_parent_class)->dispose (object);
|
|
}
|