1 /* 2 * Copyright (C) 2013 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 android.media; 18 19 /** @hide */ 20 public interface MediaTimeProvider { 21 // we do not allow negative media time 22 /** 23 * Presentation time value if no timed event notification is requested. 24 */ 25 public final static long NO_TIME = -1; 26 27 /** 28 * Cancels all previous notification request from this listener if any. It 29 * registers the listener to get seek and stop notifications. If timeUs is 30 * not negative, it also registers the listener for a timed event 31 * notification when the presentation time reaches (becomes greater) than 32 * the value specified. This happens immediately if the current media time 33 * is larger than or equal to timeUs. 34 * 35 * @param timeUs presentation time to get timed event callback at (or 36 * {@link #NO_TIME}) 37 */ 38 public void notifyAt(long timeUs, OnMediaTimeListener listener); 39 40 /** 41 * Cancels all previous notification request from this listener if any. It 42 * registers the listener to get seek and stop notifications. If the media 43 * is stopped, the listener will immediately receive a stop notification. 44 * Otherwise, it will receive a timed event notificaton. 45 */ 46 public void scheduleUpdate(OnMediaTimeListener listener); 47 48 /** 49 * Cancels all previous notification request from this listener if any. 50 */ 51 public void cancelNotifications(OnMediaTimeListener listener); 52 53 /** 54 * Get the current presentation time. 55 * 56 * @param precise Whether getting a precise time is important. This is 57 * more costly. 58 * @param monotonic Whether returned time should be monotonic: that is, 59 * greater than or equal to the last returned time. Don't 60 * always set this to true. E.g. this has undesired 61 * consequences if the media is seeked between calls. 62 * @throws IllegalStateException if the media is not initialized 63 */ 64 public long getCurrentTimeUs(boolean precise, boolean monotonic) 65 throws IllegalStateException; 66 67 /** @hide */ 68 public static interface OnMediaTimeListener { 69 /** 70 * Called when the registered time was reached naturally. 71 * 72 * @param timeUs current media time 73 */ 74 void onTimedEvent(long timeUs); 75 76 /** 77 * Called when the media time changed due to seeking. 78 * 79 * @param timeUs current media time 80 */ 81 void onSeek(long timeUs); 82 83 /** 84 * Called when the playback stopped. This is not called on pause, only 85 * on full stop, at which point there is no further current media time. 86 */ 87 void onStop(); 88 } 89 } 90 91
