Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.camera2.its; import android.content.Context; import android.graphics.ImageFormat; import android.hardware.camera2.CameraDevice; import android.hardware.camera2.CameraCharacteristics; import android.hardware.camera2.CaptureRequest; import android.hardware.camera2.CaptureResult; import android.hardware.camera2.params.MeteringRectangle; import android.hardware.camera2.params.StreamConfigurationMap; import android.media.Image; import android.media.Image.Plane; import android.net.Uri; import android.os.Environment; import android.util.Log; import android.util.Size; import org.json.JSONArray; import org.json.JSONObject; import java.nio.ByteBuffer; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.List; public class ItsUtils { public static final String TAG = ItsUtils.class.getSimpleName(); public static ByteBuffer jsonToByteBuffer(JSONObject jsonObj) { return ByteBuffer.wrap(jsonObj.toString().getBytes(Charset.defaultCharset())); } public static MeteringRectangle[] getJsonWeightedRectsFromArray(JSONArray a, boolean normalized, int width, int height) throws ItsException { try { // Returns [x0,y0,x1,y1,wgt, x0,y0,x1,y1,wgt, x0,y0,x1,y1,wgt, ...] assert (a.length() % 5 == 0); MeteringRectangle[] ma = new MeteringRectangle[a.length() / 5]; for (int i = 0; i < a.length(); i += 5) { int x, y, w, h; if (normalized) { x = (int) Math.floor(a.getDouble(i + 0) * width + 0.5f); y = (int) Math.floor(a.getDouble(i + 1) * height + 0.5f); w = (int) Math.floor(a.getDouble(i + 2) * width + 0.5f); h = (int) Math.floor(a.getDouble(i + 3) * height + 0.5f); } else { x = a.getInt(i + 0); y = a.getInt(i + 1); w = a.getInt(i + 2); h = a.getInt(i + 3); } x = Math.max(x, 0); y = Math.max(y, 0); w = Math.min(w, width - x); h = Math.min(h, height - y); int wgt = a.getInt(i + 4); ma[i / 5] = new MeteringRectangle(x, y, w, h, wgt); } return ma; } catch (org.json.JSONException e) { throw new ItsException("JSON error: ", e); } } public static JSONArray getOutputSpecs(JSONObject jsonObjTop) throws ItsException { try { if (jsonObjTop.has("outputSurfaces")) { return jsonObjTop.getJSONArray("outputSurfaces"); } return null; } catch (org.json.JSONException e) { throw new ItsException("JSON error: ", e); } } public static Size[] getRawOutputSizes(CameraCharacteristics ccs) throws ItsException { return getOutputSizes(ccs, ImageFormat.RAW_SENSOR); } public static Size[] getJpegOutputSizes(CameraCharacteristics ccs) throws ItsException { return getOutputSizes(ccs, ImageFormat.JPEG); } public static Size[] getYuvOutputSizes(CameraCharacteristics ccs) throws ItsException { return getOutputSizes(ccs, ImageFormat.YUV_420_888); } private static Size[] getOutputSizes(CameraCharacteristics ccs, int format) throws ItsException { StreamConfigurationMap configMap = ccs.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP); if (configMap == null) { throw new ItsException("Failed to get stream config"); } return configMap.getOutputSizes(format); } public static byte[] getDataFromImage(Image image) throws ItsException { int format = image.getFormat(); int width = image.getWidth(); int height = image.getHeight(); byte[] data = null; // Read image data Plane[] planes = image.getPlanes(); // Check image validity if (!checkAndroidImageFormat(image)) { throw new ItsException("Invalid image format passed to getDataFromImage: " + image.getFormat()); } if (format == ImageFormat.JPEG) { // JPEG doesn't have pixelstride and rowstride, treat it as 1D buffer. ByteBuffer buffer = planes[0].getBuffer(); data = new byte[buffer.capacity()]; buffer.get(data); return data; } else if (format == ImageFormat.YUV_420_888 || format == ImageFormat.RAW_SENSOR || format == ImageFormat.RAW10) { int offset = 0; data = new byte[width * height * ImageFormat.getBitsPerPixel(format) / 8]; byte[] rowData = new byte[planes[0].getRowStride()]; for (int i = 0; i < planes.length; i++) { ByteBuffer buffer = planes[i].getBuffer(); int rowStride = planes[i].getRowStride(); int pixelStride = planes[i].getPixelStride(); int bytesPerPixel = ImageFormat.getBitsPerPixel(format) / 8; Logt.i(TAG, String.format("Reading image: fmt %d, plane %d, w %d, h %d, rowStride %d, pixStride %d", format, i, width, height, rowStride, pixelStride)); // For multi-planar yuv images, assuming yuv420 with 2x2 chroma subsampling. int w = (i == 0) ? width : width / 2; int h = (i == 0) ? height : height / 2; for (int row = 0; row < h; row++) { if (pixelStride == bytesPerPixel) { // Special case: optimized read of the entire row int length = w * bytesPerPixel; buffer.get(data, offset, length); // Advance buffer the remainder of the row stride buffer.position(buffer.position() + rowStride - length); offset += length; } else { // Generic case: should work for any pixelStride but slower. // Use intermediate buffer to avoid read byte-by-byte from // DirectByteBuffer, which is very bad for performance. // Also need avoid access out of bound by only reading the available // bytes in the bytebuffer. int readSize = rowStride; if (buffer.remaining() < readSize) { readSize = buffer.remaining(); } buffer.get(rowData, 0, readSize); if (pixelStride >= 1) { for (int col = 0; col < w; col++) { data[offset++] = rowData[col * pixelStride]; } } else { // PixelStride of 0 can mean pixel isn't a multiple of 8 bits, for // example with RAW10. Just copy the buffer, dropping any padding at // the end of the row. int length = (w * ImageFormat.getBitsPerPixel(format)) / 8; System.arraycopy(rowData, 0, data, offset, length); offset += length; } } } } Logt.i(TAG, String.format("Done reading image, format %d", format)); return data; } else { throw new ItsException("Unsupported image format: " + format); } } private static boolean checkAndroidImageFormat(Image image) { int format = image.getFormat(); Plane[] planes = image.getPlanes(); switch (format) { case ImageFormat.YUV_420_888: case ImageFormat.NV21: case ImageFormat.YV12: return 3 == planes.length; case ImageFormat.RAW_SENSOR: case ImageFormat.RAW10: case ImageFormat.JPEG: return 1 == planes.length; default: return false; } } }