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Unsuccessful attempts at changing RGB->YUV coefficients to get proper color output. Turns out a gamma correction is needed that is more involved than I thought.

This commit is contained in:
mjbudd77 2021-09-13 23:04:14 -04:00
parent a83826c187
commit 233d555ffe
1 changed files with 63 additions and 34 deletions
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97
src/drivers/Qt/AviRecord.cpp
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@ -122,19 +122,61 @@ static void convertRgb_32_to_24( const unsigned char *src, unsigned char *dest,
//************************************************************************************** //**************************************************************************************
/* For RGB2YUV: */ /* For RGB2YUV: */
static const int RGB2YUV_SHIFT = 15; /* highest value where [RGB][YUV] fit in signed short */ //static const int RGB2YUV_SHIFT = 15; // highest value where [RGB][YUV] fit in signed short
static const int RY = 8414; // ((int)(( 65.738/256.0)*(1<<RGB2YUV_SHIFT)+0.5)); //static const int RY = 8414; // ((int)(( 65.738/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
static const int RV = 14392; // ((int)((112.439/256.0)*(1<<RGB2YUV_SHIFT)+0.5)); //static const int RV = 14392; // ((int)((112.439/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
static const int RU = -4856; // ((int)((-37.945/256.0)*(1<<RGB2YUV_SHIFT)+0.5)); //static const int RU = -4856; // ((int)((-37.945/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
//
//static const int GY = 16519; // ((int)((129.057/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
//static const int GV = -12051;// ((int)((-94.154/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
//static const int GU = -9534; // ((int)((-74.494/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
//
//static const int BY = 3208; // ((int)(( 25.064/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
//static const int BV = -2339; // ((int)((-18.285/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
//static const int BU = 14392; // ((int)((112.439/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
static const int GY = 16519; // ((int)((129.057/256.0)*(1<<RGB2YUV_SHIFT)+0.5)); #define RGB2YUV_SHIFT 15 // highest value where [RGB][YUV] fit in signed short
static const int GV = -12051;// ((int)((-94.154/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
static const int GU = -9534; // ((int)((-74.494/256.0)*(1<<RGB2YUV_SHIFT)+0.5));
static const int BY = 3208; // ((int)(( 25.064/256.0)*(1<<RGB2YUV_SHIFT)+0.5)); //#define BY ((int)( 0.098 * (1 << RGB2YUV_SHIFT) + 0.5))
static const int BV = -2339; // ((int)((-18.285/256.0)*(1<<RGB2YUV_SHIFT)+0.5)); //#define BV ((int)(-0.071 * (1 << RGB2YUV_SHIFT) + 0.5))
static const int BU = 14392; // ((int)((112.439/256.0)*(1<<RGB2YUV_SHIFT)+0.5)); //#define BU ((int)( 0.439 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GY ((int)( 0.504 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GV ((int)(-0.368 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GU ((int)(-0.291 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RY ((int)( 0.257 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RV ((int)( 0.439 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RU ((int)(-0.148 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define BY ((int)( 0.114 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define BV ((int)(-0.100 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define BU ((int)( 0.436 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GY ((int)( 0.587 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GV ((int)(-0.515 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GU ((int)(-0.289 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RY ((int)( 0.299 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RV ((int)( 0.615 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RU ((int)(-0.148 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define BY ((int)( 0.11400 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define BV ((int)(-0.08131 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define BU ((int)( 0.50000 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GY ((int)( 0.58700 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GV ((int)(-0.41869 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define GU ((int)(-0.33126 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RY ((int)( 0.29900 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RV ((int)( 0.50000 * (1 << RGB2YUV_SHIFT) + 0.5))
//#define RU ((int)(-0.16874 * (1 << RGB2YUV_SHIFT) + 0.5))
#define BY ( (int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define BV (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define BU ( (int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define GY ( (int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define GV (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define GU (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define RY ( (int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define RV ( (int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define RU (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
static const int Y_ADD = 16; static const int Y_ADD = 16;
static const int U_ADD = 128; static const int U_ADD = 128;
@ -151,6 +193,7 @@ void Convert_4byte_To_I420Frame(const void* data, unsigned char* dest, unsigned
unsigned vpos = npixels; unsigned vpos = npixels;
unsigned upos = vpos + npixels / 4; unsigned upos = vpos + npixels / 4;
unsigned stride = width*PixStride; unsigned stride = width*PixStride;
int Y, U, V;
/*fprintf(stderr, "npixels=%u, width=%u, height=%u, ypos=%u,upos=%u,vpos=%u", /*fprintf(stderr, "npixels=%u, width=%u, height=%u, ypos=%u,upos=%u,vpos=%u",
npixels,width,height, ypos,upos,vpos);*/ npixels,width,height, ypos,upos,vpos);*/
@ -162,22 +205,6 @@ void Convert_4byte_To_I420Frame(const void* data, unsigned char* dest, unsigned
{ {
for(unsigned x=0; x<width; x += 2) for(unsigned x=0; x<width; x += 2)
{ {
//#ifdef __MMX__
// if(PixStride == 4)
// {
// c64_MMX p0_1; p0_1.Get(&src[pos]); // two 32-bit pixels (4*8)
// c64_MMX p2_3; p2_3.Get(&src[pos+stride]); // two 32-bit pixels
// pos += PixStride*2;
//
// Convert_I420_MMX_Common(p0_1, p2_3,
// dest+ypos,
// dest+ypos+width,
// dest+upos++,
// dest+vpos++);
// }
// else
//#endif
{ {
int c[3], rgb[3][4]; int c[3], rgb[3][4];
@ -193,15 +220,21 @@ void Convert_4byte_To_I420Frame(const void* data, unsigned char* dest, unsigned
unsigned destpos[4] = { ypos, ypos+width, ypos+1, ypos+width+1 }; unsigned destpos[4] = { ypos, ypos+width, ypos+1, ypos+width+1 };
for(int n=0; n<4; ++n) for(int n=0; n<4; ++n)
{ {
dest[destpos[n]] Y = Y_ADD + ((RY * rgb[0][n]
= Y_ADD + ((RY * rgb[0][n]
+ GY * rgb[1][n] + GY * rgb[1][n]
+ BY * rgb[2][n] + BY * rgb[2][n]
) >> RGB2YUV_SHIFT); // y ) >> RGB2YUV_SHIFT); // y
dest[destpos[n]] = Y;
} }
dest[upos++] = (U_ADD + ((RU * c[0] + GU * c[1] + BU * c[2]) >> (RGB2YUV_SHIFT+2)) ); U = (U_ADD + ((RU * c[0] + GU * c[1] + BU * c[2]) >> (RGB2YUV_SHIFT+2)) );
dest[vpos++] = (V_ADD + ((RV * c[0] + GV * c[1] + BV * c[2]) >> (RGB2YUV_SHIFT+2)) ); V = (V_ADD + ((RV * c[0] + GV * c[1] + BV * c[2]) >> (RGB2YUV_SHIFT+2)) );
//printf("%i,%i = rgb( %i, %i, %i ) = yuv( %i, %i, %i )\n", x,y,
// rgb[0][3], rgb[1][3], rgb[2][3], Y, U, V );
dest[upos++] = U;
dest[vpos++] = V;
} }
ypos += 2; ypos += 2;
@ -212,10 +245,6 @@ void Convert_4byte_To_I420Frame(const void* data, unsigned char* dest, unsigned
/*fprintf(stderr, ",yr=%u,ur=%u,vr=%u\n", /*fprintf(stderr, ",yr=%u,ur=%u,vr=%u\n",
ypos,upos,vpos);*/ ypos,upos,vpos);*/
//#ifdef __MMX__
// MMX_clear();
//#endif
} }
//************************************************************************************** //**************************************************************************************
#ifdef _USE_X264 #ifdef _USE_X264