/*
* Copyright (c) 2009 Levente Farkas
* Copyright (C) 2009 Tamas Korodi <kotyo@zamba.fm>
* Copyright (c) 2008 Wayne Meissner
*
* This file is part of gstreamer-java.
*
* This code is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License version 3 only, as
* published by the Free Software Foundation.
*
* This code 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 Lesser General Public License
* version 3 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with this work. If not, see <http://www.gnu.org/licenses/>.
*/
package org.gstreamer.interfaces;
import org.gstreamer.GObject;
import org.gstreamer.lowlevel.GstAPI.GstCallback;
import org.gstreamer.lowlevel.GstTunerAPI;
import com.sun.jna.NativeLong;
import com.sun.jna.Pointer;
import static org.gstreamer.lowlevel.GstTunerAPI.GSTTUNER_API;
/**
*
*/
public class TunerChannel extends GObject {
private final GstTunerAPI.TunerChannelStruct struct;
private final Tuner tuner;
public static final class Flags {
public static final int INPUT = (1<<0);
public static final int OUTPUT = (1<<1);
public static final int FREQUENCY = (1<<2);
public static final int AUDIO = (1<<3);
}
/**
* For internal gstreamer-java use only
*
* @param init initialization data
*/
public TunerChannel(Initializer init) {
super(init);
throw new IllegalArgumentException("Cannot instantiate");
}
TunerChannel(Tuner tuner, Pointer ptr, boolean needRef, boolean ownsHandle) {
super(initializer(ptr, needRef, ownsHandle));
struct = new GstTunerAPI.TunerChannelStruct(ptr);
this.tuner = tuner;
}
/**
* Checks if a flag is set on this channel.
*
* @return true if the flag is set
*/
public final boolean hasFlag(int flag) {
return (struct.getFlags() & flag) != 0;
}
/**
* Retrieves the current frequency from the given channel
*
* @return the current frequency
*/
public long getFrequency() {
return GSTTUNER_API.gst_tuner_get_frequency(tuner, this).longValue();
}
/**
* Retrieves the label from the given channel
*
* @return the label
*/
public String getLabel() {
return struct.getLabel();
}
/**
* Sets a tuning frequency on the given tuner/channel.
* <p><b>Note:</b> this requires the given channel to be a "tuning"
* channel, which can be checked with {@link #isTuningChannel}
*/
public void setFrequency(long frequency) {
GSTTUNER_API.gst_tuner_set_frequency(tuner, this, new NativeLong(frequency));
}
/**
* Checks if the frequency of this channel can be changed
*
* @return true if this channel is a tuning channel
*/
public boolean isTuningChannel() {
return hasFlag(Flags.FREQUENCY);
}
/**
* Gets the strength of the signal on this channel.
* <p><b>Note:</b> this requires the current channel to be a "tuning"
* channel, i.e. a channel on which frequency can be set. This can be
* checked using {@link #isTuningChannel()}
*
* @return the current signal strength
*/
public int getSignalStrength() {
return GSTTUNER_API.gst_tuner_signal_strength(tuner, this);
}
/**
* Signal emitted when the frequency on a channel changes
*
* @see #connect(FREQUENCY_CHANGED)
* @see #disconnect(FREQUENCY_CHANGED)
*/
public static interface FREQUENCY_CHANGED {
/**
* Called when the frequency on a {@link Tuner} changes
*
* @param channel the channel which the frequency changed on
* @param frequency the current frequency
*/
public void frequencyChanged(TunerChannel channel, long frequency);
}
/**
* Signal emitted when the signal strength on a channel changes
*
* @see #connect(SIGNAL_CHANGED)
* @see #disconnect(SIGNAL_CHANGED)
*/
public static interface SIGNAL_CHANGED {
/**
* Called when the signal strength on a {@link Tuner} changes
*
* @param channel the channel which the signal strength changed on
* @param signal the new signal strength
*/
public void signalChanged(TunerChannel channel, int signal);
}
/**
* Add a listener for frequency-changed messages.
*
* @param listener The listener to be called when the frequency changes
*/
public void connect(final FREQUENCY_CHANGED listener) {
connect(FREQUENCY_CHANGED.class, listener, new GstCallback() {
@SuppressWarnings("unused")
public boolean callback(long frequency) {
listener.frequencyChanged(TunerChannel.this, frequency);
return true;
}
});
}
/**
* Disconnect the listener for frequency-changed messages.
*
* @param listener The listener that was registered to receive the message.
*/
public void disconnect(FREQUENCY_CHANGED listener) {
super.disconnect(FREQUENCY_CHANGED.class, listener);
}
/**
* Add a listener for signal-changed messages.
*
* @param listener The listener to be called when the signal strength changes
*/
public void connect(final SIGNAL_CHANGED listener) {
connect(SIGNAL_CHANGED.class, listener, new GstCallback() {
@SuppressWarnings("unused")
public boolean callback(int signal) {
listener.signalChanged(TunerChannel.this, signal);
return true;
}
});
}
/**
* Disconnect the listener for signal-changed messages.
*
* @param listener The listener that was registered to receive the message.
*/
public void disconnect(SIGNAL_CHANGED listener) {
super.disconnect(SIGNAL_CHANGED.class, listener);
}
}