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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.hardware;
import android.content.Context;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.util.Log;
/**
* Class that operates consumer infrared on the device.
*
* <p>
* To obtain an instance of the system infrared transmitter, call
* {@link android.content.Context#getSystemService(java.lang.String)
* Context.getSystemService()} with
* {@link android.content.Context#CONSUMER_IR_SERVICE} as the argument.
* </p>
*/
public final class ConsumerIrManager {
private static final String TAG = "ConsumerIr";
private final String mPackageName;
private final IConsumerIrService mService;
/**
* @hide to prevent subclassing from outside of the framework
*/
public ConsumerIrManager(Context context) {
mPackageName = context.getPackageName();
mService = IConsumerIrService.Stub.asInterface(
ServiceManager.getService(Context.CONSUMER_IR_SERVICE));
}
/**
* Check whether the device has an infrared emitter.
*
* @return true if the device has an infrared emitter, else false.
*/
public boolean hasIrEmitter() {
if (mService == null) {
Log.w(TAG, "no consumer ir service.");
return false;
}
try {
return mService.hasIrEmitter();
} catch (RemoteException e) {
}
return false;
}
/**
* Transmit an infrared pattern
* <p>
* This method is synchronous; when it returns the pattern has
* been transmitted. Only patterns shorter than 2 seconds will
* be transmitted.
* </p>
*
* @param carrierFrequency The IR carrier frequency in Hertz.
* @param pattern The alternating on/off pattern in microseconds to transmit.
*/
public void transmit(int carrierFrequency, int[] pattern) {
if (mService == null) {
Log.w(TAG, "failed to transmit; no consumer ir service.");
return;
}
try {
mService.transmit(mPackageName, carrierFrequency, pattern);
} catch (RemoteException e) {
Log.w(TAG, "failed to transmit.", e);
}
}
/**
* Represents a range of carrier frequencies (inclusive) on which the
* infrared transmitter can transmit
*/
public final class CarrierFrequencyRange {
private final int mMinFrequency;
private final int mMaxFrequency;
/**
* Create a segment of a carrier frequency range.
*
* @param min The minimum transmittable frequency in this range segment.
* @param max The maximum transmittable frequency in this range segment.
*/
public CarrierFrequencyRange(int min, int max) {
mMinFrequency = min;
mMaxFrequency = max;
}
/**
* Get the minimum (inclusive) frequency in this range segment.
*/
public int getMinFrequency() {
return mMinFrequency;
}
/**
* Get the maximum (inclusive) frequency in this range segment.
*/
public int getMaxFrequency() {
return mMaxFrequency;
}
};
/**
* Query the infrared transmitter's supported carrier frequencies
*
* @return an array of
* {@link android.hardware.ConsumerIrManager.CarrierFrequencyRange}
* objects representing the ranges that the transmitter can support, or
* null if there was an error communicating with the Consumer IR Service.
*/
public CarrierFrequencyRange[] getCarrierFrequencies() {
if (mService == null) {
Log.w(TAG, "no consumer ir service.");
return null;
}
try {
int[] freqs = mService.getCarrierFrequencies();
if (freqs.length % 2 != 0) {
Log.w(TAG, "consumer ir service returned an uneven number of frequencies.");
return null;
}
CarrierFrequencyRange[] range = new CarrierFrequencyRange[freqs.length / 2];
for (int i = 0; i < freqs.length; i += 2) {
range[i / 2] = new CarrierFrequencyRange(freqs[i], freqs[i+1]);
}
return range;
} catch (RemoteException e) {
}
return null;
}
}
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