Android GLSurfaceView 显示YUV数据的坑，图像偏蓝色

前几天学习使用 GLSurfaceView 显示摄像头获取到的YUV数据，发现画面偏蓝色。经过反复的查找，原来是采集的数据排列顺序的问题，

params.setPictureFormat(ImageFormat.NV21);

本来以为数据排列是



按照这个数据顺序，显示出来的图像有问题（偏蓝色），一个偶然的机会，突然想到是不是UV数据出错了。结果查看了帮助文档：



居然是 YCrCb，不是 YCbCr哦。



粗心的人伤不起啊，以后要多加仔细了。

下面放点源代码。

YUV转RGBA像素点算法

这里写代码片
private static final String vertexShaderString =
"attribute vec4 vertexIn;" +
"attribute vec2 textureIn;" +
"varying vec2 textureOut;" +
"void main() {" +
"gl_Position = vertexIn;" +
"textureOut = textureIn;" +
"}";
private static final String yuvFragmentShaderString =
"precision mediump float;" +
"uniform sampler2D tex_y;" +
"uniform sampler2D tex_u;" +
"uniform sampler2D tex_v;" +
"varying vec2 textureOut;" +
"void main() {" +
"float y = (texture2D(tex_y, textureOut).r - 16./255.) * 1.164;" +
" if(y < 0.0) y=0.0;" +
"vec4 c = vec4(y);" +
"vec4 U = vec4(texture2D(tex_u, textureOut).r - 128./255.);" +
"vec4 V = vec4(texture2D(tex_v, textureOut).r - 128./255.);" +
"c += V * vec4(1.596, -0.813, 0, 0);" +
"c += U * vec4(0, -0.392, 2.017, 0);" +
//                    "c.a = 1.0;" +
"gl_FragColor = c;" +
"}";

YUV数据分离

这里写代码片
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
Camera.Size size = camera.getParameters().getPreviewSize(); //获取预览大小
int width = size.width;
int height = size.height;
int pixelLength = width * height;
byte[] yData = new byte[pixelLength];
byte[] uData = new byte[pixelLength / 4];
byte[] vData = new byte[pixelLength / 4];
System.arraycopy(data, 0, yData, 0, pixelLength);
for (int i = 0; i < pixelLength / 4; i++) {
vData[i] = data[pixelLength + i * 2];
uData[i] = data[pixelLength + i * 2 + 1];
}
//处理YUV数据
}