标签：int NSLog ++ YUV char width RGB rgba
YUV常见格式是以下四种,其他的格式自行搜索,以下是转换方法
I420: YYYYYYYY UU VV =>YUV420P
YV12: YYYYYYYY VV UU =>YUV420P
NV12: YYYYYYYY UVUV =>YUV420SP
NV21: YYYYYYYY VUVU =>YUV420SP
以下转换方法是RGBA的像素格式,如果是ARGB,RGB,BGR等,自行去转换,
或者调整方法;
I420: YYYYYYYY UU VV =>YUV420P转换方法
char rgba[] = {
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0
};
NSLog(@"===y===%d",(int)(0.299*1 + 0.587*2 + 0.114*3));
NSLog(@"===u===%d",(int)(-0.1687*1 - 0.3313*2 + 0.5*3 + 128));
NSLog(@"===v===%d",(int)(0.5*1 - 0.4187*2 - 0.0813*3 + 128));
int height = 4;
int width = 4;
int frameSize = width * height;
int yIndex = 0;
int vIndex = frameSize;
int uIndex = frameSize*1.25;
unsigned char *yuv_Y = (unsigned char *)malloc(frameSize+frameSize/4+frameSize/4);
int r, g, b, y, u, v, a;
int index = 0;
size_t offset,p;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {//RGBA
offset = ((width * j) + i);
p = offset*4;
//
r = rgba[p + 0];
g = rgba[p + 1];
b = rgba[p + 2];
a = rgba[p + 3];
//转换
y = 0.299*r + 0.587*g + 0.114*b;
u = -0.1687*r - 0.3313*g + 0.5*b + 128;
v = 0.5*r - 0.4187*g - 0.0813*b + 128;
yuv_Y[yIndex++] = y;
if (j % 2 == 0 && i % 2 == 0) {//按2 * 2矩阵取
yuv_Y[vIndex++] = u;
yuv_Y[uIndex++] = v;
}
index ++;
}
}
for (int i = 0; i<frameSize+frameSize/2; i++) {
NSLog(@"===y===%d",yuv_Y[i]);
}
I420: YYYYYYYY UU VV =>YUV420P转换方法(2)
char rgba[] = {
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0
};
NSLog(@"===y===%d",(int)(0.299*1 + 0.587*2 + 0.114*3));
NSLog(@"===u===%d",(int)(-0.1687*1 - 0.3313*2 + 0.5*3 + 128));
NSLog(@"===v===%d",(int)(0.5*1 - 0.4187*2 - 0.0813*3 + 128));
int height = 4;
int width = 4;
int frameSize = width * height;
int yIndex = 0;
int vIndex = 0;
int uIndex = 0;
unsigned char *yuv_Y = (unsigned char *)malloc(frameSize);
unsigned char *yuv_V = (unsigned char *)malloc(frameSize/4);
unsigned char *yuv_U = (unsigned char *)malloc(frameSize/4);
int r, g, b, y, u, v, a;
int index = 0;
size_t offset,p;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {//RGBA
offset = ((width * j) + i);
p = offset*4;
//
r = rgba[p + 0];
g = rgba[p + 1];
b = rgba[p + 2];
a = rgba[p + 3];
//转换
y = 0.299*r + 0.587*g + 0.114*b;
u = -0.1687*r - 0.3313*g + 0.5*b + 128;
v = 0.5*r - 0.4187*g - 0.0813*b + 128;
yuv_Y[yIndex++] = y;
if (j % 2 == 0 && i % 2 == 0) {//按2 * 2矩阵取
yuv_V[vIndex++] = v;
yuv_U[uIndex++] = u;
}
index ++;
}
}
for (int i = 0; i<frameSize; i++) {
NSLog(@"===y===%d",yuv_Y[i]);
}
for (int i = 0; i<frameSize/4; i++) {
NSLog(@"===v===%d",yuv_V[i]);
}
for (int i = 0; i<frameSize/4; i++) {
NSLog(@"===u===%d",yuv_U[i]);
}
YV12: YYYYYYYY VV UU =>YUV420P转换方法
char rgba[] = {
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0
};
NSLog(@"===y===%d",(int)(0.299*1 + 0.587*2 + 0.114*3));
NSLog(@"===u===%d",(int)(-0.1687*1 - 0.3313*2 + 0.5*3 + 128));
NSLog(@"===v===%d",(int)(0.5*1 - 0.4187*2 - 0.0813*3 + 128));
int height = 4;
int width = 4;
int frameSize = width * height;
int yIndex = 0;
int vIndex = frameSize;
int uIndex = frameSize * 1.25;
unsigned char *yuv = (unsigned char *)malloc(frameSize + frameSize/4 + frameSize/4);
int r, g, b, y, u, v, a;
int index = 0;
size_t offset,p;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {//RGBA
offset = ((width * j) + i);
p = offset*4;
//
r = rgba[p + 0];
g = rgba[p + 1];
b = rgba[p + 2];
a = rgba[p + 3];
//转换
y = 0.299*r + 0.587*g + 0.114*b;
u = -0.1687*r - 0.3313*g + 0.5*b + 128;
v = 0.5*r - 0.4187*g - 0.0813*b + 128;
yuv[yIndex++] = y;
if (j % 2 == 0 && i % 2 == 0) {//按2 * 2矩阵取
yuv[vIndex++] = v;
yuv[uIndex++] = u;
}
index ++;
}
}
for (int i = 0; i<frameSize + frameSize/2; i++) {
NSLog(@"===y===%d",yuv[i]);
}
NV21: YYYYYYYY VUVU =>YUV420SP转换方法
char rgba[] = {
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0
};
NSLog(@"===y===%d",(int)(0.299*1 + 0.587*2 + 0.114*3));
NSLog(@"===u===%d",(int)(-0.1687*1 - 0.3313*2 + 0.5*3 + 128));
NSLog(@"===v===%d",(int)(0.5*1 - 0.4187*2 - 0.0813*3 + 128));
int height = 4;
int width = 4;
int wh = width * height;
unsigned char *bufY = (unsigned char *)malloc(wh);
unsigned char *bufUV = (unsigned char *)malloc(wh/2);
size_t offset,p;
int r,g,b,y,u,v;
int a=255;
for (int row = 0; row < height; ++row) {
for (int col = 0; col < width; ++col) {
//
offset = ((width * row) + col);
p = offset*4;
//
r = rgba[p + 0];
g = rgba[p + 1];
b = rgba[p + 2];
a = rgba[p + 3];
//
y = 0.299*r + 0.587*g + 0.114*b;
u = -0.1687*r - 0.3313*g + 0.5*b + 128;
v = 0.5*r - 0.4187*g - 0.0813*b + 128;
//
bufY[offset] = y;
bufUV[(row/2)*width + (col/2)*2] = v;
bufUV[(row/2)*width + (col/2)*2 + 1] = u;
}
}
for (int i = 0; i<wh; i++) {
NSLog(@"===y===%d",bufY[i]);
}
for (int i = 0; i<wh/2; i++) {
NSLog(@"===uv===%d",bufUV[i]);
}
NV12: YYYYYYYY UVUV =>YUV420SP转换方法
char rgba[] = {
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0,
1,2,3,0,1,2,3,0,1,2,3,0,1,2,3,0
};
NSLog(@"===y===%d",(int)(0.299*1 + 0.587*2 + 0.114*3));
NSLog(@"===u===%d",(int)(-0.1687*1 - 0.3313*2 + 0.5*3 + 128));
NSLog(@"===v===%d",(int)(0.5*1 - 0.4187*2 - 0.0813*3 + 128));
int height = 4;
int width = 4;
int wh = width * height;
unsigned char *bufY = (unsigned char *)malloc(wh);
unsigned char *bufUV = (unsigned char *)malloc(wh/2);
size_t offset,p;
int r,g,b,y,u,v;
int a=255;
for (int row = 0; row < height; ++row) {
for (int col = 0; col < width; ++col) {
//
offset = ((width * row) + col);
p = offset*4;
//
r = rgba[p + 0];
g = rgba[p + 1];
b = rgba[p + 2];
a = rgba[p + 3];
//
y = 0.299*r + 0.587*g + 0.114*b;
u = -0.1687*r - 0.3313*g + 0.5*b + 128;
v = 0.5*r - 0.4187*g - 0.0813*b + 128;
//
bufY[offset] = y;
bufUV[(row/2)*width + (col/2)*2] = u;
bufUV[(row/2)*width + (col/2)*2 + 1] = v;
}
}
for (int i = 0; i<wh; i++) {
NSLog(@"===y===%d",bufY[i]);
}
for (int i = 0; i<wh/2; i++) {
NSLog(@"===uv===%d",bufUV[i]);
}
标签：int,NSLog,++,YUV,char,width,RGB,rgba 来源： https://blog.csdn.net/sinat_34245894/article/details/121989218
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