Comments (3)
@leestars 确定导出的YUV数据到底是NV21的,还是NV12的。output导出的数据是YUV的,但是YUV也有YUV420\YUV422\YUV420SP等等格式,建议先看下这些基础性的东西。
from audiovideo.
我查了资料,确实有很多种格式,我调用output方法,看打印出来的log是yuv420p,我用了下面这种方法将yuv转rgb,转出来的效果是一样的。
private int[] yuv420pToRgb(byte[] yuv420p,int width,int height) {
int frameSize = width * height;
int[] rgb = new int[frameSize];
int i = 0, j = 0,yp = 0;
int uvp = 0, u = 0, v = 0;
for (j = 0, yp = 0; j < height; j++) {
uvp = frameSize + (j >> 1) * width;
u = 0;
v = 0;
for (i = 0; i < width; i++, yp++)
{
int y = (0xff & ((int) yuv420p[yp])) - 16;
if (y < 0)
y = 0;
if ((i & 1) == 0)
{
v = (0xff & yuv420p[uvp++]) - 128;
u = (0xff & yuv420p[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (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);
}
}
return rgb;
}
有黑白图像,但是有绿色的紫色在上面,这种情况是不是y转对了,但是u和v没有转对?
@doggycoder
from audiovideo.
我查了资料,确实有很多种格式,我调用output方法,看打印出来的log是yuv420p,我用了下面这种方法将yuv转rgb,转出来的效果是一样的。
private int[] yuv420pToRgb(byte[] yuv420p,int width,int height) {
int frameSize = width * height;
int[] rgb = new int[frameSize];
int i = 0, j = 0,yp = 0;
int uvp = 0, u = 0, v = 0;
for (j = 0, yp = 0; j < height; j++) {
uvp = frameSize + (j >> 1) * width;
u = 0;
v = 0;
for (i = 0; i < width; i++, yp++)
{
int y = (0xff & ((int) yuv420p[yp])) - 16;
if (y < 0)
y = 0;
if ((i & 1) == 0)
{
v = (0xff & yuv420p[uvp++]) - 128;
u = (0xff & yuv420p[uvp++]) - 128;
}int y1192 = 1192 * y; int r = (y1192 + 1634 * v); int g = (y1192 - 833 * v - 400 * u); int b = (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); } } return rgb; }
有黑白图像,但是有绿色的紫色在上面,这种情况是不是y转对了,但是u和v没有转对?
@doggycoder
是不是UV的通道读错了,比如误将V通道读入了U通道数据
from audiovideo.
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