以下にいくつかのコードがあります..YUV_420_888(android camera2 api)画像形式をARGB8888に変換し、jpegに保存します..しかし、結果はほぼ完全に緑色です..これを期待どおりに動作させる方法はありますか??
private ByteBuffer image2ByteBuffer(Image image) {
Image.Plane Y = image.getPlanes()[0];
Image.Plane U = image.getPlanes()[1];
Image.Plane V = image.getPlanes()[2];
int yRowStride = Y.getRowStride();
int yPixelStride = Y.getPixelStride();
int uRowStride = U.getRowStride();
int uPixelStride = U.getPixelStride();
int vRowStride = V.getRowStride();
int vPixelStride = V.getPixelStride();
ByteBuffer YBuffer = Y.getBuffer();
ByteBuffer UBuffer = U.getBuffer();
ByteBuffer VBuffer = V.getBuffer();
YBuffer.rewind();
UBuffer.rewind();
VBuffer.rewind();
int yb, ub, vb;
yb = YBuffer.capacity();
ub = UBuffer.capacity();
vb = VBuffer.capacity();
byte[] ybb, ubb,vbb;
ybb = new byte[yb];
ubb = new byte[ub];
vbb = new byte[vb];
YBuffer.get(ybb);
UBuffer.get(ubb);
VBuffer.get(vbb);
byte[] yData = ybb;
byte[] uData = new byte[yb/4];
byte[] vData = new byte[yb/4];
int index = 0;
for(int i = 0; (i < (640 * 480 * 0.5)) && (index < (640 * 480 * 0.25)); i += uPixelStride){
uData[index] = ubb[i];
vData[index] = vbb[i];
index++;
}
byte[] yuv420sp = new byte[(int)(640 * 480 * 1.5)];
// Y DATA FIRST
for (int i = 0 ; i < 640 * 480; i++)
yuv420sp[i] = yData[i];
//UV INTERLEAVED DATA NEXT
index = 640 * 480;
for (int i = 0; i < (640 * 480 * 0.25); i++) {
yuv420sp[index] = uData[i];
index++;
yuv420sp[index] = vData[i];
index++;
}
int[] decoded = new int[640 * 480];
YUV420Converter.decodeYUV420888(decoded, yuv420sp, 640, 480);
Bitmap bitmap = Bitmap.createBitmap(decoded, 640, 480, Bitmap.Config.ARGB_8888);
ByteBuffer byteBuffer = ByteBuffer.allocate(640 * 480 * 4);
bitmap.copyPixelsToBuffer(byteBuffer);
bitmap.recycle();
return byteBuffer;
}
次のコードはイメージリーダーからのものです
public void onImageAvailable(ImageReader reader) {
Image image = reader.acquireLatestImage();
ByteBuffer byteBuffer = image2ByteBuffer(image);
saveImage(byteBuffer);
byteBuffer.clear();
image.close();
}
public void saveImage(ByteBuffer imageByteBuffer) {
try {
imageByteBuffer.rewind();
Bitmap imageBitmap = Bitmap.createBitmap(WIDTH, HEIGHT, Bitmap.Config.ARGB_8888);
imageBitmap.copyPixelsFromBuffer(imageByteBuffer);
String filePath = Environment.getExternalStorageDirectory().getPath()
+ "/pic" + mImagesCount + ".png";
FileOutputStream fileOutputStream = new FileOutputStream(filePath);
imageBitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
//fileOutputStream.write(imageByteArray);
fileOutputStream.flush();
fileOutputStream.close();
imageBitmap.recycle();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
適切にフォーマットされた YUV を取得したら、ARGB にデコードするために使用されます
public static void decodeYUV420888(int[] rgb, byte[] yuv420sp, int width, int height) {
final int frameSize = width * height;
for (int j = 0, yp = 0; j < height; j++) { int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i++, yp++) {
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0)
y = 0;
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int b = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int r = (y1192 + 2066 * u);
if (r < 0) r = 0; else if (r > 262143)
r = 262143;
if (g < 0) g = 0; else if (g > 262143)
g = 262143;
if (b < 0) b = 0; else if (b > 262143)
b = 262143;
rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
}
}
}