/ocr/ocrservice/src/com/googlecode/eyesfree/ocr/intent/CaptureActivity.java

  1/*
  2 * Copyright (C) 2011 Google Inc.
  3 *
  4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  5 * use this file except in compliance with the License. You may obtain a copy of
  6 * 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, WITHOUT
 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 13 * License for the specific language governing permissions and limitations under
 14 * the License.
 15 */
 16
 17package com.googlecode.eyesfree.ocr.intent;
 18
 19import android.app.Activity;
 20import android.graphics.Rect;
 21import android.graphics.YuvImage;
 22import android.hardware.Camera;
 23import android.net.Uri;
 24import android.os.Bundle;
 25import android.util.Log;
 26
 27import com.googlecode.eyesfree.ocr.client.Intents;
 28import com.googlecode.eyesfree.opticflow.FrameProducer.Frame;
 29import com.googlecode.eyesfree.opticflow.FrameProducer.FrameReceiver;
 30
 31import java.io.IOException;
 32import java.io.OutputStream;
 33
 34/**
 35 * @author alanv@google.com (Alan Viverette)
 36 */
 37public abstract class CaptureActivity extends CameraActivity {
 38    private static final String TAG = "CaptureActivity";
 39
 40    private static final int DEFAULT_JPEG_QUALITY = 85;
 41
 42    private Uri mSaveUri;
 43
 44    @Override
 45    public void onCreate(Bundle savedInstanceState) {
 46        super.onCreate(savedInstanceState);
 47
 48        mSaveUri = getIntent().getParcelableExtra(Intents.Detect.EXTRA_OUTPUT);
 49    }
 50
 51    protected void takePreview() {
 52        getCameraManager().requestFrame(frameCallback);
 53    }
 54
 55    protected void takePicture() {
 56        getCameraManager().requestPicture(pictureCallback);
 57    }
 58
 59    private void writePreview(byte[] yuvData, int format, int width, int height) {
 60        Log.i(TAG, "Writing preview to " + mSaveUri.toString());
 61
 62        int result = Activity.RESULT_CANCELED;
 63
 64        try {
 65            Rect rectangle = new Rect(0, 0, width, height);
 66
 67            OutputStream stream = getContentResolver().openOutputStream(mSaveUri);
 68
 69            YuvImage yuvImage = new YuvImage(yuvData, format, width, height, null);
 70            yuvImage.compressToJpeg(rectangle, DEFAULT_JPEG_QUALITY, stream);
 71
 72            stream.close();
 73
 74            result = Activity.RESULT_OK;
 75        } catch (IOException e) {
 76            e.printStackTrace();
 77        }
 78
 79        setResult(result);
 80        finish();
 81    }
 82
 83    private void writePicture(byte[] jpegData) {
 84        Log.i(TAG, "Writing picture to " + mSaveUri.toString());
 85
 86        int result = Activity.RESULT_CANCELED;
 87
 88        try {
 89            OutputStream stream = getContentResolver().openOutputStream(mSaveUri);
 90
 91            stream.write(jpegData);
 92            stream.close();
 93
 94            result = Activity.RESULT_OK;
 95        } catch (IOException e) {
 96            e.printStackTrace();
 97        }
 98
 99        setResult(result);
100        finish();
101    }
102
103    private final FrameReceiver frameCallback = new FrameReceiver() {
104        @Override
105        public void onFrameReceived(Frame frame) {
106            writePreview(frame.data, frame.format, frame.width, frame.height);
107
108            frame.recycle();
109        }
110    };
111
112    private final Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {
113        @Override
114        public void onPictureTaken(byte[] data, Camera camera) {
115            writePicture(data);
116        }
117    };
118}