如何将RGB转换为NV12 [英] How to convert RGB to NV12

问题描述

以下是将NV12转换为RGB的代码。

我想要的是从RGB转换为NV12。



无效CFramePump： ：NV12ToRGB（BYTE * pOut，BYTE * pIn，unsigned int Width，unsigned int Height）

{





HRESULT hr = S_OK;

DWORD dexOut = 0;



unsigned int PX，PY;



int y [4];

int u;

int v;





int rbg_off;



int y_off = 0;

int v_off =高度*宽度;

unsigned int rgb;

rbg_off = 0;

int ppy = 0;

int ppx = 0;

int off;



for（PY = 0; PY< Height; PY + = 2）

{



for（PX = 0; PX <宽度; PX + = 2）

{



//获取YUV值

y_off = PY *宽度+ PX;



y [0] = pIn [y_off] ;

y [1] = pIn [y_off + 1];

y [2] = pIn [y_off + Width];

y [3] = pIn [y_off + Width + 1];





u = pIn [v_off ++];



v = pIn [v_off ++];



off =（PY *宽度* 3）+（PX * 3）;



rgb = yuv2rgb（y [0]，u，v）;

pOut [off] =（rgb& 0x000000ff）;

pOut [off + 1] =（rgb& 0x0000ff00）>> 8;

pOut [off + 2] =（rgb& 0x00ff0000）>> 16;





rgb = yuv2rgb（y [1]，u，v）;

pOut [ off + 3] =（rgb& 0x000000ff）;

pOut [off + 4] =（rgb& 0x0000ff00）>> 8;

pOut [off + 5] =（rgb& 0x00ff0000）>> 16;



off + =（宽* 3）;



rgb = yuv2rgb（y [2] ，u，v）;

pOut [off] =（rgb& 0x000000ff）;

pOut [off + 1] =（rgb& 0x0000ff00）>> ; 8;

pOut [off + 2] =（rgb& 0x00ff0000）>> 16;



rgb = yuv2rgb（y [3]，u，v）;

pOut [off + 3] =（rgb& ; 0x000000ff）;

pOut [off + 4] =（rgb& 0x0000ff00）>> 8;

pOut [off + 5] =（rgb& 0x00ff0000）>> 16;





}



}

$ / b $ b $



unsigned int yuv2rgb（int Y，int Cr，int Cb）

{

int Ey，Epb，Epr;

int例如，Eb，Er;

unsigned int result;



Ey =（Y-16）;

Epb =（Cb-128）;

Epr =（Cr-128）;



Eg =（298 * Ey - 100 * Epb - 208 * Epr）/ 256;

Eb =（298 * Ey + 516 * Epb）/ 256;

Er =（298 * Ey + 408 * Epr）/ 256;



if（例如> 255）

Eg = 255;

if（例如< 0）

Eg = 0;



if（Eb> 255）

Eb = 255;

if（Eb< 0）

Eb = 0;



if（Er> 255）

Er = 255;

if（Er< 0）

Er = 0;



result =（Eb<< 16）| （例如<< 8）|尔;



返回结果;

}



我的尝试：



从NV12转换为RGB。

我想要RGB到NV12转换例程。

解决方案

看一下这个链接：



GitHub - cohenrotem / Rgb2NV12：将RGB转换为NV12色彩空间，在Matlab中，IPP ，Plain C和SSE优化代码 [ ^ ]

Below is the code for converting NV12 to RGB.
What i want is conversion from RGB to NV12.

void CFramePump::NV12ToRGB( BYTE* pOut, BYTE* pIn,unsigned int Width, unsigned int Height)
{


HRESULT hr = S_OK;
DWORD dexOut = 0;

unsigned int PX,PY;

int y[4];
int u;
int v;


int rbg_off;

int y_off = 0;
int v_off=Height*Width;
unsigned int rgb;
rbg_off = 0;
int ppy =0;
int ppx =0;
int off;

for (PY=0;PY<Height;PY+=2)
{

for (PX=0;PX<Width;PX+=2)
{

// getting the YUV values
y_off =PY*Width+PX;

y[0] = pIn[y_off];
y[1] = pIn[y_off+1];
y[2] = pIn[y_off+Width];
y[3] = pIn[y_off+Width+1];


u = pIn[v_off++];

v = pIn[v_off++];

off = (PY*Width*3)+(PX*3);

rgb = yuv2rgb(y[0], u, v);
pOut[off] = (rgb & 0x000000ff);
pOut[off+1] = (rgb & 0x0000ff00) >> 8;
pOut[off+2] = (rgb & 0x00ff0000) >> 16;


rgb = yuv2rgb( y[1],u,v);
pOut[off+3] = (rgb & 0x000000ff);
pOut[off+4] = (rgb & 0x0000ff00) >> 8;
pOut[off+5] = (rgb & 0x00ff0000) >> 16;

off+=(Width*3);

rgb = yuv2rgb( y[2],u,v);
pOut[off] = (rgb & 0x000000ff);
pOut[off+1] = (rgb & 0x0000ff00) >> 8;
pOut[off+2] = (rgb & 0x00ff0000) >> 16;

rgb = yuv2rgb( y[3],u,v);
pOut[off+3] = (rgb & 0x000000ff);
pOut[off+4] = (rgb & 0x0000ff00) >> 8;
pOut[off+5] = (rgb & 0x00ff0000) >> 16;


}

}

}

unsigned int yuv2rgb( int Y, int Cr ,int Cb )
{
int Ey, Epb, Epr;
int Eg, Eb, Er;
unsigned int result;

Ey = (Y-16);
Epb = (Cb-128);
Epr = (Cr-128);

Eg = (298*Ey - 100*Epb - 208*Epr)/256;
Eb = (298*Ey + 516*Epb)/256;
Er = (298*Ey + 408*Epr)/256;

if(Eg > 255)
Eg = 255;
if(Eg < 0)
Eg = 0;

if(Eb > 255)
Eb = 255;
if(Eb < 0)
Eb = 0;

if(Er > 255)
Er = 255;
if(Er < 0)
Er = 0;

result = (Eb << 16) | (Eg << 8) | Er;

return result;
}

What I have tried:

Conversion from NV12 to RGB.
I want RGB to NV12 conversion routine.

解决方案

take a look at this link:

GitHub - cohenrotem/Rgb2NV12: Convert RGB to NV12 color space, in Matlab, IPP, Plain C, and SSE optimized code[^]

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