从 摄像头 预览 图像中获取yuv（或者格式数据） 转换成 jpeg bmp格式 转成bmp 格式，网上有人说，用 rawByteArray2RGBABitmap2 直接转的效率更高
Camera.PreviewCallback mPreviewCallback = new Camera.PreviewCallback() { @Override public void onPreviewFrame(byte[] data, Camera camera) { decodeToJpeg(data,camera); } }
public static void decodeToJpeg(byte[] data,Camera camera){ try { Size size = camera.getParameters().getPreviewSize(); int format = camera.getParameters().getPreviewFormat(); log(“>>>>>>”+”format = “+ format+”size=”+size.width+”,”+size.height); YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null); ByteArrayOutputStream stream = new ByteArrayOutputStream(); image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, stream); byte[] buf = stream.toByteArray();
log(">>>>>>" + "yuv Size="+data.length+",jpeg Size = "+stream.size()+","+buf.length); stream.close(); } catch (Exception e) { e.printStackTrace(); } } public static void yuvToBmp(byte[] data,Camera camera){ try { Size size = camera.getParameters().getPreviewSize(); int format = camera.getParameters().getPreviewFormat(); log(">>>>>>"+"format = "+ format+"size="+size.width+","+size.height); YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null); ByteArrayOutputStream stream = new ByteArrayOutputStream(); image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, stream); Bitmap bmp = BitmapFactory.decodeByteArray( stream.toByteArray(), 0, stream.size()); log(bmp.getWidth() + " " + bmp.getHeight()); log(">>>>>>" + "yuv Size="+data.length+",jpeg Size = "+stream.size()); stream.close(); bmp.recycle(); } catch (Exception e) { e.printStackTrace(); } } public Bitmap rawByteArray2RGBABitmap2(byte[] data, int width, int height) { int frameSize = width * height; int[] rgba = new int[frameSize]; for (int i = 0; i < height; i++) for (int j = 0; j < width; j++) { int y = (0xff & ((int) data[i * width + j])); int u = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 0])); int v = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 1])); y = y < 16 ? 16 : y; int r = Math.round(1.164f * (y - 16) + 1.596f * (v - 128)); int g = Math.round(1.164f * (y - 16) - 0.813f * (v - 128) - 0.391f * (u - 128)); int b = Math.round(1.164f * (y - 16) + 2.018f * (u - 128)); r = r < 0 ? 0 : (r > 255 ? 255 : r); g = g < 0 ? 0 : (g > 255 ? 255 : g); b = b < 0 ? 0 : (b > 255 ? 255 : b); rgba[i * width + j] = 0xff000000 + (b << 16) + (g << 8) + r; } Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bmp.setPixels(rgba, 0 , width, 0, 0, width, height); return bmp; }