1 /* 2 * Copyright (C) 2014 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.camera.one.v2.sharedimagereader; 18 19 import com.android.camera.async.HandlerFactory; 20 import com.android.camera.async.Lifetime; 21 import com.android.camera.async.Observable; 22 import com.android.camera.async.Updatable; 23 import com.android.camera.one.v2.camera2proxy.ImageReaderProxy; 24 import com.android.camera.one.v2.core.RequestBuilder; 25 import com.android.camera.one.v2.sharedimagereader.imagedistributor.ImageDistributor; 26 import com.android.camera.one.v2.sharedimagereader.imagedistributor.ImageDistributorFactory; 27 import com.android.camera.one.v2.sharedimagereader.ticketpool.FiniteTicketPool; 28 import com.android.camera.one.v2.sharedimagereader.ticketpool.TicketPool; 29 30 /** 31 * Usage: 32 * <p> 33 * Ensure that *all* capture requests send to the camera device update the 34 * global timestamp queue with the timestamp associated with the image as soon 35 * as it arrives. 36 * <p> 37 * Add the OnImageAvailableListener to the image reader in a separate thread. 38 * <p> 39 * Use the {@link ManagedImageReader} to create image streams to add to 40 * {@link RequestBuilder}s to interact with the camera and ImageReader. 41 */ 42 public class SharedImageReaderFactory { 43 private final Updatable<Long> mGlobalTimestampQueue; 44 private final ManagedImageReader mSharedImageReader; 45 private final Observable<Integer> mAvailableImageCount; 46 47 /** 48 * @param lifetime The lifetime of the SharedImageReader, and other 49 * components, to produce. Note that this may be shorter than the 50 * lifetime of the provided ImageReader. 51 * @param imageReader The ImageReader to wrap. Note that this can outlive 52 * @param handlerFactory Used for create handler threads on which to receive 53 * callbacks from the platform. 54 */ 55 public SharedImageReaderFactory(Lifetime lifetime, ImageReaderProxy imageReader, 56 HandlerFactory handlerFactory) { 57 ImageDistributorFactory imageDistributorFactory = new ImageDistributorFactory(new 58 Lifetime(lifetime), imageReader, handlerFactory); 59 ImageDistributor imageDistributor = imageDistributorFactory.provideImageDistributor(); 60 mGlobalTimestampQueue = imageDistributorFactory.provideGlobalTimestampCallback(); 61 62 TicketPool ticketPool = new FiniteTicketPool(imageReader.getMaxImages() - 2); 63 mAvailableImageCount = ticketPool.getAvailableTicketCount(); 64 mSharedImageReader = new ManagedImageReader( 65 new Lifetime(lifetime), ticketPool, imageReader.getSurface(), imageDistributor); 66 } 67 68 public Updatable<Long> provideGlobalTimestampQueue() { 69 return mGlobalTimestampQueue; 70 } 71 72 public ManagedImageReader provideSharedImageReader() { 73 return mSharedImageReader; 74 } 75 76 public Observable<Integer> provideAvailableImageCount() { 77 return mAvailableImageCount; 78 } 79 } 80
