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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
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* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* tunerchannel.c: tuner channel object design
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "tunerchannel.h"
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/**
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* SECTION:gsttunerchannel
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* @title: GstTunerChannel
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* @short_description: A channel from an element implementing the #GstTuner
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* interface.
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*
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* The #GstTunerChannel object is provided by an element implementing
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* the #GstTuner interface.
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*
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* GstTunerChannel provides a name and flags to determine the type and
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* capabilities of the channel. If the GST_TUNER_CHANNEL_FREQUENCY flag is
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* set, then the channel also information about the minimum and maximum
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* frequency, and range of the reported signal strength.
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*/
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enum
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{
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/* FILL ME */
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SIGNAL_FREQUENCY_CHANGED,
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SIGNAL_SIGNAL_CHANGED,
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LAST_SIGNAL
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};
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G_DEFINE_TYPE (GstTunerChannel, gst_tuner_channel, G_TYPE_OBJECT);
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static void gst_tuner_channel_dispose (GObject * object);
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static guint signals[LAST_SIGNAL] = { 0 };
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static void
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gst_tuner_channel_class_init (GstTunerChannelClass * klass)
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{
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GObjectClass *object_klass = (GObjectClass *) klass;
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/**
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* GstTunerChannel::frequency-changed:
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* @tunerchannel: The #GstTunerChannel
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* @frequency: The new frequency (an unsigned long)
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*
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* Reports that the current frequency has changed.
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*/
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signals[SIGNAL_FREQUENCY_CHANGED] =
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g_signal_new ("frequency-changed", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstTunerChannelClass, frequency_changed),
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NULL, NULL, NULL, G_TYPE_NONE, 1, G_TYPE_ULONG);
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/**
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* GstTunerChannel::signal-changed:
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* @tunerchannel: The #GstTunerChannel
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* @signal: The new signal strength (an integer)
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*
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* Reports that the signal strength has changed.
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*
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* See Also: gst_tuner_signal_strength()
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*/
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signals[SIGNAL_SIGNAL_CHANGED] =
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g_signal_new ("signal-changed", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstTunerChannelClass, signal_changed),
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NULL, NULL, NULL, G_TYPE_NONE, 1, G_TYPE_INT);
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object_klass->dispose = gst_tuner_channel_dispose;
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}
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static void
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gst_tuner_channel_init (GstTunerChannel * channel)
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{
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channel->label = NULL;
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channel->flags = 0;
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channel->min_frequency = channel->max_frequency = 0;
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channel->min_signal = channel->max_signal = 0;
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}
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static void
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gst_tuner_channel_dispose (GObject * object)
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{
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GstTunerChannel *channel = GST_TUNER_CHANNEL (object);
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if (channel->label) {
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g_free (channel->label);
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channel->label = NULL;
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}
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G_OBJECT_CLASS (gst_tuner_channel_parent_class)->dispose (object);
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}
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