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.initialization; 18 19 import android.hardware.camera2.CameraAccessException; 20 import android.os.Handler; 21 import android.view.Surface; 22 23 import com.android.camera.one.v2.camera2proxy.CameraCaptureSessionProxy; 24 import com.android.camera.one.v2.camera2proxy.CameraDeviceProxy; 25 import com.google.common.util.concurrent.ListenableFuture; 26 import com.google.common.util.concurrent.SettableFuture; 27 28 import java.util.List; 29 30 /** 31 * Asynchronously creates capture sessions. 32 */ 33 class CaptureSessionCreator { 34 private final CameraDeviceProxy mDevice; 35 private final Handler mCameraHandler; 36 37 /** 38 * @param device The device on which to create the capture session. 39 * @param cameraHandler The handler on which to process capture session 40 * state callbacks. 41 */ 42 public CaptureSessionCreator(CameraDeviceProxy device, Handler cameraHandler) { 43 mDevice = device; 44 mCameraHandler = cameraHandler; 45 } 46 47 /** 48 * Asynchronously creates a capture session, returning a future to it. 49 * 50 * @param surfaces The set of output surfaces for the camera capture 51 * session. 52 * @return A Future for the camera capture session. 53 */ 54 public ListenableFuture<CameraCaptureSessionProxy> createCaptureSession( 55 List<Surface> surfaces) { 56 final SettableFuture<CameraCaptureSessionProxy> sessionFuture = SettableFuture.create(); 57 try { 58 mDevice.createCaptureSession(surfaces, new CameraCaptureSessionProxy.StateCallback() { 59 @Override 60 public void onActive(CameraCaptureSessionProxy session) { 61 // Ignore. 62 } 63 64 @Override 65 public void onConfigureFailed(CameraCaptureSessionProxy session) { 66 sessionFuture.cancel(true); 67 session.close(); 68 } 69 70 @Override 71 public void onConfigured(CameraCaptureSessionProxy session) { 72 boolean valueSet = sessionFuture.set(session); 73 if (!valueSet) { 74 // If the future was already marked with cancellation or 75 // an exception, close the session. 76 session.close(); 77 } 78 } 79 80 @Override 81 public void onReady(CameraCaptureSessionProxy session) { 82 // Ignore. 83 } 84 85 @Override 86 public void onClosed(CameraCaptureSessionProxy session) { 87 sessionFuture.cancel(true); 88 session.close(); 89 } 90 }, mCameraHandler); 91 } catch (CameraAccessException e) { 92 sessionFuture.setException(e); 93 } 94 return sessionFuture; 95 } 96 } 97
