StarMirror/qTox
1
0
Fork 0
mirror of https://github.com/qTox/qTox.git synced 2024-03-22 14:00:36 +08:00
Code Issues Projects Releases Wiki Activity

Dramatically improve video quality

Browse Source 
Improve color space conversion

Fix bad order of arithemtic operation, i*cxbpl/2 becomes i/2*cxbpl, this fixed the 'ghost' images on the other parts of the screen when using subsampling
This commit is contained in:
Tux3 / Mlkj / !Lev.uXFMLA 2014-07-01 12:06:59 +02:00
parent c0564783fd
commit baf40991b8
1 changed files with 27 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
widget/camera.cpp
View File

@ -4,6 +4,21 @@
#include <QVideoEncoderSettings>
#include <QVideoEncoderSettingsControl>
static inline float getR(int Y, int V)
{
return qMax(qMin((int)(1.164*(Y - 16) + 1.596*(V - 128)),255),0);
}
static inline float getG(int Y, int U, int V)
{
return qMax(qMin((int)(1.164*(Y - 16) - 0.813*(V - 128) - 0.391*(U - 128)),255),0);
}
static inline float getB(int Y, int U)
{
return qMax(qMin((int)(1.164*(Y - 16) + 2.018*(U - 128)),255),0);
}
Camera::Camera()
: refcount{0}, camera{new QCamera}
{
@ -132,13 +147,13 @@ QImage Camera::getLastImage()
uint32_t* scanline = (uint32_t*)img.scanLine(i);
for (int j=0; j < bpl; j++)
{
float Y = yData[i*bpl + j];
float U = uData[i*cxbpl/2 + j/2];
float V = vData[i*cxbpl/2 + j/2];
int Y = yData[i*bpl + j];
int U = uData[i/2*cxbpl + j/2];
int V = vData[i/2*cxbpl + j/2];
uint8_t R = qMax(qMin((int)(Y + 1.402 * (V - 128)),255),0);
uint8_t G = qMax(qMin((int)(Y - 0.344 * (U - 128) - 0.714 * (V - 128)),255),0);
uint8_t B = qMax(qMin((int)(Y + 1.772 * (U - 128)),255),0);
uint8_t R = getR(Y,V);
uint8_t G = getG(Y,U,V);
uint8_t B = getB(Y,U);
scanline[j] = (0xFF<<24) + (R<<16) + (G<<8) + B;
}
@ -154,13 +169,13 @@ QImage Camera::getLastImage()
uint32_t* scanline = (uint32_t*)img.scanLine(i);
for (int j=0; j < bpl; j++)
{
float Y = yData[i*bpl + j];
float U = uData[i*cxbpl/2 + j/2];
float V = vData[i*cxbpl/2 + j/2];
int Y = yData[i*bpl + j];
int U = uData[i/2*cxbpl + j/2];
int V = vData[i/2*cxbpl + j/2];
uint8_t R = qMax(qMin((int)(Y + 1.402 * (V - 128)),255),0);
uint8_t G = qMax(qMin((int)(Y - 0.344 * (U - 128) - 0.714 * (V - 128)),255),0);
uint8_t B = qMax(qMin((int)(Y + 1.772 * (U - 128)),255),0);
uint8_t R = getR(Y,V);
uint8_t G = getG(Y,U,V);
uint8_t B = getB(Y,U);
scanline[j] = (0xFF<<24) + (R<<16) + (G<<8) + B;
}