我如何转换的Android位图NV12颜色格式? [英] How can I convert android bitmap to NV12 color format?
问题描述
我在写一些code为转换的Android位图NV12格式。
I'm writing some code for converting android bitmap to NV12 format.
我发现code,让我NV21从Android的位图,它似乎是code工作。 (转换位图阵列YUV(的YCbCr NV21))
I found code that gives me NV21 from android bitmap, and it seems that the code works. (Convert bitmap array to YUV (YCbCr NV21))
唯一的区别,我发现是根据参考NV12和NV21之间切换U和V字节。 ( http://www.fourcc.org/yuv.php )
Only difference I found is to switch U and V byte between NV12 and NV21 according to reference. (http://www.fourcc.org/yuv.php)
于是我改变了U形,并从原来的code中的位置V,然后将结果就像下面的。
So I changed the position of U and V from original code, and then the result is like following.
byte [] getNV12(int inputWidth, int inputHeight, Bitmap scaled) {
// Reference (Variation) : https://gist.github.com/wobbals/5725412
int [] argb = new int[inputWidth * inputHeight];
//Log.i(TAG, "scaled : " + scaled);
scaled.getPixels(argb, 0, inputWidth, 0, 0, inputWidth, inputHeight);
byte [] yuv = new byte[inputWidth*inputHeight*3/2];
encodeYUV420SP(yuv, argb, inputWidth, inputHeight);
scaled.recycle();
return yuv;
}
void encodeYUV420SP(byte[] yuv420sp, int[] argb, int width, int height) {
final int frameSize = width * height;
int yIndex = 0;
int uvIndex = frameSize;
int a, R, G, B, Y, U, V;
int index = 0;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {
a = (argb[index] & 0xff000000) >> 24; // a is not used obviously
R = (argb[index] & 0xff0000) >> 16;
G = (argb[index] & 0xff00) >> 8;
B = (argb[index] & 0xff) >> 0;
// well known RGB to YUV algorithm
Y = ( ( 66 * R + 129 * G + 25 * B + 128) >> 8) + 16;
V = ( ( -38 * R - 74 * G + 112 * B + 128) >> 8) + 128; // Previously U
U = ( ( 112 * R - 94 * G - 18 * B + 128) >> 8) + 128; // Previously V
yuv420sp[yIndex++] = (byte) ((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));
if (j % 2 == 0 && index % 2 == 0) {
yuv420sp[uvIndex++] = (byte)((V<0) ? 0 : ((V > 255) ? 255 : V));
yuv420sp[uvIndex++] = (byte)((U<0) ? 0 : ((U > 255) ? 255 : U));
}
index ++;
}
}
}
我错在将图像转换? (我是pretty的肯定EN codeR也没问题。)
Am I wrong in converting images? (I'm pretty sure that encoder has no problem.)
破碎的形象截图:<一href="https://www.dropbox.com/s/vho14831fgnh1kl/Thu%20Aug%2001%2008_56_14%20GMT%2B09_00%202013%20%281%29.mp4_000002000.jpg" rel="nofollow">https://www.dropbox.com/s/vho14831fgnh1kl/Thu%20Aug%2001%2008_56_14%20GMT%2B09_00%202013%20%281%29.mp4_000002000.jpg
推荐答案
替换
a = (argb[index] & 0xff000000) >> 24; // a is not used obviously
R = (argb[index] & 0xff0000) >> 16;
G = (argb[index] & 0xff00) >> 8;
B = (argb[index] & 0xff) >> 0;
与
R = (argb[index] & 0xff000000) >>> 24;
G = (argb[index] & 0xff0000) >> 16;
B = (argb[index] & 0xff00) >> 8;
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