LE Audio: add ContentControlIdKeeper (101018fb) · Commits · e / os / android_packages_modules_Bluetooth

android/app/src/com/android/bluetooth/le_audio/ContentControlIdKeeper.java

0 → 100644

+61 −0

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		/*
		* Copyright 2021 HIMSA II K/S - www.himsa.com.
		* Represented by EHIMA - www.ehima.com
		*
		* 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 com.android.le_audio;

		import java.util.SortedSet;
		import java.util.TreeSet;

		/**
		* This class keeps Content Control Ids for LE Audio profiles.
		*/
		public class ContentControlIdKeeper {

		public static final int CCID_INVALID = 0;
		public static final int CCID_MIN = 0x01;
		public static final int CCID_MAX = 0xFF;

		private static SortedSet<Integer> sAssignedCcidList = new TreeSet();

		public static synchronized int acquireCcid() {
		int ccid = CCID_INVALID;

		if (sAssignedCcidList.size() == 0) {
		ccid = CCID_MIN;
		} else if (sAssignedCcidList.last() < CCID_MAX) {
		ccid = sAssignedCcidList.last() + 1;
		} else if (sAssignedCcidList.first() > CCID_MIN) {
		ccid = sAssignedCcidList.first() - 1;
		} else {
		int first_ccid_avail = sAssignedCcidList.first() + 1;
		while (first_ccid_avail < CCID_MAX - 1) {
		if (!sAssignedCcidList.contains(first_ccid_avail)) {
		ccid = first_ccid_avail;
		break;
		}
		first_ccid_avail++;
		}
		}

		if (ccid != CCID_INVALID) sAssignedCcidList.add(ccid);
		return ccid;
		}

		public static synchronized void releaseCcid(int value) {
		sAssignedCcidList.remove(value);
		}
		}