1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.internal.telephony.d2d; 18 19 import android.content.ContentResolver; 20 import android.provider.Settings; 21 22 /** 23 * Timeouts and configuration parameters related to the device-to-device communication code. 24 */ 25 public final class Timeouts { 26 27 public static class Adapter { 28 private final ContentResolver mContentResolver; 29 Adapter(ContentResolver cr)30 public Adapter(ContentResolver cr) { 31 mContentResolver = cr; 32 } 33 getRtpMessageAckDurationMillis()34 public long getRtpMessageAckDurationMillis() { 35 return Timeouts.getRtpMessageAckDurationMillis(mContentResolver); 36 } 37 38 /** 39 * The minimum interval between DTMF digits. 40 * @return minimum interval in millis. 41 */ getDtmfMinimumIntervalMillis()42 public long getDtmfMinimumIntervalMillis() { 43 return Timeouts.getDtmfMinimumIntervalMillis(mContentResolver); 44 } 45 getMaxDurationOfDtmfMessageMillis()46 public long getMaxDurationOfDtmfMessageMillis() { 47 return Timeouts.getMaxDurationOfDtmfMessageMillis(mContentResolver); 48 } 49 getDtmfDurationFuzzMillis()50 public long getDtmfDurationFuzzMillis() { 51 return Timeouts.getDtmfDurationFuzzMillis(mContentResolver); 52 } 53 getDtmfNegotiationTimeoutMillis()54 public long getDtmfNegotiationTimeoutMillis() { 55 return Timeouts.getDtmfNegotiationTimeoutMillis(mContentResolver); 56 } 57 } 58 59 /** A prefix to use for all keys so to not clobber the global namespace. */ 60 private static final String PREFIX = "telephony.d2d."; 61 62 /** 63 * Returns the timeout value from Settings or the default value if it hasn't been changed. This 64 * method is safe to call from any thread, including the UI thread. 65 * 66 * @param contentResolver The content resolved. 67 * @param key Settings key to retrieve. 68 * @param defaultValue Default value, in milliseconds. 69 * @return The timeout value from Settings or the default value if it hasn't been changed. 70 */ get(ContentResolver contentResolver, String key, long defaultValue)71 private static long get(ContentResolver contentResolver, String key, long defaultValue) { 72 return Settings.Secure.getLong(contentResolver, PREFIX + key, defaultValue); 73 } 74 75 /** 76 * Determines the length of time to wait for acknowledgement of an RTP header extension before 77 * retrying a message send. 78 * @param cr 79 * @return 80 */ getRtpMessageAckDurationMillis(ContentResolver cr)81 public static long getRtpMessageAckDurationMillis(ContentResolver cr) { 82 return get(cr, "rtp_message_ack_duration_millis", 1000L); 83 } 84 85 /** 86 * Determines the minimum duration between DTMF digits. Digits are sent with this much spacing 87 * between them. 88 * @param cr 89 * @return 90 */ getDtmfMinimumIntervalMillis(ContentResolver cr)91 public static long getDtmfMinimumIntervalMillis(ContentResolver cr) { 92 return get(cr, "dtmf_minimum_interval_millis", 100L); 93 } 94 95 /** 96 * Determines the maximum amount of time to wait for a single DTMF sequence. 97 * @param cr 98 * @return 99 */ getMaxDurationOfDtmfMessageMillis(ContentResolver cr)100 public static long getMaxDurationOfDtmfMessageMillis(ContentResolver cr) { 101 return get(cr, "dtmf_max_message_duration_millis", 1000L); 102 } 103 104 /** 105 * Determines the maximum amount of time to wait for negotiation of the DTMF protocol. 106 * @param cr 107 * @return 108 */ getDtmfNegotiationTimeoutMillis(ContentResolver cr)109 public static long getDtmfNegotiationTimeoutMillis(ContentResolver cr) { 110 return get(cr, "dtmf_negotiation_timeout_millis", 3000L); 111 } 112 113 /** 114 * A random amount of time up to this amount will be added to 115 * {@link #getMaxDurationOfDtmfMessageMillis(ContentResolver)} when determining how long to 116 * wait before sending a DTMF message. This fuzz factor is used to account for timing 117 * discrepancies between devices. 118 * @param cr 119 * @return 120 */ getDtmfDurationFuzzMillis(ContentResolver cr)121 public static long getDtmfDurationFuzzMillis(ContentResolver cr) { 122 return get(cr, "dtmf_duration_fuzz_millis", 10L); 123 } 124 125 } 126