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.processing.imagebackend;
18 
19 import android.graphics.ImageFormat;
20 
21 import android.graphics.Rect;
22 import com.android.camera.debug.Log;
23 import com.android.camera.one.v2.camera2proxy.ImageProxy;
24 import com.android.camera.session.CaptureSession;
25 
26 import java.util.List;
27 import java.util.concurrent.Executor;
28 
29 /**
30  * Implements the conversion of a YUV_420_888 image to compressed JPEG byte
31  * array, as two separate tasks: the first to copy from the image to NV21 memory
32  * layout, and the second to convert the image into JPEG, using the built-in
33  * Android compressor.
34  *
35  * TODO: Implement cropping, if required.
36  */
37 class TaskChainedCompressImageToJpeg extends TaskJpegEncode {
38     private final static Log.Tag TAG = new Log.Tag("TaskChainJpg");
39 
TaskChainedCompressImageToJpeg(ImageToProcess image, Executor executor, ImageTaskManager imageTaskManager, CaptureSession captureSession)40     TaskChainedCompressImageToJpeg(ImageToProcess image, Executor executor,
41             ImageTaskManager imageTaskManager, CaptureSession captureSession) {
42         super(image, executor, imageTaskManager, ProcessingPriority.SLOW, captureSession);
43     }
44 
logWrapper(String message)45     private void logWrapper(String message) {
46         // Do nothing.
47     }
48 
49     @Override
run()50     public void run() {
51         ImageToProcess img = mImage;
52         Rect safeCrop = guaranteedSafeCrop(img.proxy, img.crop);
53         final List<ImageProxy.Plane> planeList = img.proxy.getPlanes();
54 
55         final TaskImage inputImage = new TaskImage(mImage.rotation, img.proxy.getWidth(),
56                 img.proxy.getHeight(), img.proxy.getFormat(), safeCrop);
57         final TaskImage resultImage = new TaskImage(mImage.rotation, img.proxy.getWidth(),
58                 img.proxy.getHeight(), ImageFormat.JPEG , safeCrop);
59         byte[] dataCopy;
60         int[] strides = new int[3];
61 
62         try {
63             onStart(mId, inputImage, resultImage, TaskInfo.Destination.FINAL_IMAGE);
64 
65             // Do the byte copy
66             strides[0] = planeList.get(0).getRowStride()
67                     / planeList.get(0).getPixelStride();
68             strides[1] = planeList.get(1).getRowStride()
69                     / planeList.get(1).getPixelStride();
70             strides[2] = 2 * planeList.get(2).getRowStride()
71                     / planeList.get(2).getPixelStride();
72 
73             // TODO: For performance, use a cache subsystem for buffer reuse.
74             dataCopy = convertYUV420ImageToPackedNV21(img.proxy);
75         } finally {
76             // Release the image now that you have a usable copy
77             mImageTaskManager.releaseSemaphoreReference(img, mExecutor);
78         }
79 
80         final byte[] chainedDataCopy = dataCopy;
81         final int[] chainedStrides = strides;
82 
83         // This task drops the image reference.
84         TaskImageContainer chainedTask = new TaskJpegEncode(this, ProcessingPriority.SLOW) {
85 
86             @Override
87             public void run() {
88                 // Image is closed by now. Do NOT reference image directly.
89                 byte[] compressedData = convertNv21toJpeg(chainedDataCopy,
90                         resultImage.height, resultImage.width, chainedStrides);
91                 onJpegEncodeDone(mId, inputImage, resultImage, compressedData,
92                         TaskInfo.Destination.FINAL_IMAGE);
93                 logWrapper("Finished off a chained task now that image is released.");
94             }
95         };
96 
97         // Passed null, since the image has already been released.
98         mImageTaskManager.appendTasks(null, chainedTask);
99         logWrapper("Kicking off a chained task now that image is released.");
100     }
101 }
102