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libswscale
Commit e68c321d authored by michael's avatar michael
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more scaling algos 


git-svn-id: file:///var/local/repositories/mplayer/trunk/postproc@6638 b3059339-0415-0410-9bf9-f77b7e298cf2
parent 07c51bac
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Showing with 107 additions and 50 deletions
swscale.c
View file @ e68c321d
......@@ -958,6 +958,10 @@ void swsGetFlagsAndFilterFromCmdLine(int *flags, SwsFilter **srcFilterParam, Sws
case 4: *flags|= SWS_POINT; break;
case 5: *flags|= SWS_AREA; break;
case 6: *flags|= SWS_BICUBLIN; break;
case 7: *flags|= SWS_GAUSS; break;
case 8: *flags|= SWS_SINC; break;
case 9: *flags|= SWS_LANCZOS; break;
case 10:*flags|= SWS_SPLINE; break;
default:*flags|= SWS_BILINEAR; break;
}
......@@ -975,6 +979,16 @@ SwsContext *getSwsContextFromCmdLine(int srcW, int srcH, int srcFormat, int dstW
return getSwsContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, srcFilterParam, dstFilterParam);
}
static double getSplineCoeff(double a, double b, double c, double d, double dist)
{
// printf("%f %f %f %f %f\n", a,b,c,d,dist);
if(dist<=1.0) return ((d*dist + c)*dist + b)*dist +a;
else return getSplineCoeff( 0.0,
b+ 2.0*c + 3.0*d,
c + 3.0*d,
-b- 3.0*c - 6.0*d,
dist-1.0);
}
static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *outFilterSize, int xInc,
int srcW, int dstW, int filterAlign, int one, int flags,
......@@ -1025,7 +1039,7 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
xDstInSrc+= xInc;
}
}
else if(xInc <= (1<<16) || (flags&SWS_FAST_BILINEAR)) // upscale
else if((xInc <= (1<<16) && (flags&SWS_AREA)) || (flags&SWS_FAST_BILINEAR)) // bilinear upscale
{
int i;
int xDstInSrc;
......@@ -1041,32 +1055,6 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
int j;
(*filterPos)[i]= xx;
if((flags & SWS_BICUBIC) || (flags & SWS_X))
{
double d= ABS(((xx+1)<<16) - xDstInSrc)/(double)(1<<16);
double y1,y2,y3,y4;
double A= -0.6;
if(flags & SWS_BICUBIC){
// Equation is from VirtualDub
y1 = ( + A*d - 2.0*A*d*d + A*d*d*d);
y2 = (+ 1.0 - (A+3.0)*d*d + (A+2.0)*d*d*d);
y3 = ( - A*d + (2.0*A+3.0)*d*d - (A+2.0)*d*d*d);
y4 = ( + A*d*d - A*d*d*d);
}else{
// cubic interpolation (derived it myself)
y1 = ( -2.0*d + 3.0*d*d - 1.0*d*d*d)/6.0;
y2 = (6.0 -3.0*d - 6.0*d*d + 3.0*d*d*d)/6.0;
y3 = ( +6.0*d + 3.0*d*d - 3.0*d*d*d)/6.0;
y4 = ( -1.0*d + 1.0*d*d*d)/6.0;
}
filter[i*filterSize + 0]= y1;
filter[i*filterSize + 1]= y2;
filter[i*filterSize + 2]= y3;
filter[i*filterSize + 3]= y4;
}
else
{
//Bilinear upscale / linear interpolate / Area averaging
for(j=0; j<filterSize; j++)
{
......@@ -1076,35 +1064,48 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
filter[i*filterSize + j]= coeff;
xx++;
}
}
xDstInSrc+= xInc;
}
}
else // downscale
else
{
int xDstInSrc;
ASSERT(dstW <= srcW)
double xDstInSrc;
double sizeFactor, filterSizeInSrc;
const double xInc1= (double)xInc / (double)(1<<16);
int param= (flags&SWS_PARAM_MASK)>>SWS_PARAM_SHIFT;
if (flags&SWS_BICUBIC) sizeFactor= 4.0;
else if(flags&SWS_X) sizeFactor= 8.0;
else if(flags&SWS_AREA) sizeFactor= 1.0; //downscale only, for upscale it is bilinear
else if(flags&SWS_GAUSS) sizeFactor= 8.0; // infinite ;)
else if(flags&SWS_LANCZOS) sizeFactor= param ? 2.0*param : 6.0;
else if(flags&SWS_SINC) sizeFactor= 100.0; // infinite ;)
else if(flags&SWS_SPLINE) sizeFactor= 20.0; // infinite ;)
else if(flags&SWS_BILINEAR) sizeFactor= 2.0;
else ASSERT(0)
if(xInc1 <= 1.0) filterSizeInSrc= sizeFactor; // upscale
else filterSizeInSrc= sizeFactor*srcW / (double)dstW;
if(flags&SWS_BICUBIC) filterSize= (int)ceil(1 + 4.0*srcW / (double)dstW);
else if(flags&SWS_X) filterSize= (int)ceil(1 + 4.0*srcW / (double)dstW);
else if(flags&SWS_AREA) filterSize= (int)ceil(1 + 1.0*srcW / (double)dstW);
else /* BILINEAR */ filterSize= (int)ceil(1 + 2.0*srcW / (double)dstW);
filter= (double*)memalign(8, dstW*sizeof(double)*filterSize);
filterSize= (int)ceil(1 + filterSizeInSrc); // will be reduced later if possible
if(filterSize > srcW-2) filterSize=srcW-2;
xDstInSrc= xInc/2 - 0x8000;
filter= (double*)memalign(16, dstW*sizeof(double)*filterSize);
xDstInSrc= xInc1 / 2.0 - 0.5;
for(i=0; i<dstW; i++)
{
int xx= (int)((double)xDstInSrc/(double)(1<<16) - (filterSize-1)*0.5 + 0.5);
int xx= (int)(xDstInSrc - (filterSize-1)*0.5 + 0.5);
int j;
(*filterPos)[i]= xx;
for(j=0; j<filterSize; j++)
{
double d= ABS((xx<<16) - xDstInSrc)/(double)xInc;
double d= ABS(xx - xDstInSrc)/filterSizeInSrc*sizeFactor;
double coeff;
if((flags & SWS_BICUBIC) || (flags & SWS_X))
if(flags & SWS_BICUBIC)
{
double A= -0.75;
// d*=2;
double A= param ? -param*0.01 : -0.60;
// Equation is from VirtualDub
if(d<1.0)
coeff = (1.0 - (A+3.0)*d*d + (A+2.0)*d*d*d);
......@@ -1113,22 +1114,62 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
else
coeff=0.0;
}
/* else if(flags & SWS_X)
{
double p= param ? param*0.01 : 0.3;
coeff = d ? sin(d*PI)/(d*PI) : 1.0;
coeff*= pow(2.0, - p*d*d);
}*/
else if(flags & SWS_X)
{
double A= param ? param*0.1 : 1.0;
if(d<1.0)
coeff = cos(d*PI);
else
coeff=-1.0;
if(coeff<0.0) coeff= -pow(-coeff, A);
else coeff= pow( coeff, A);
coeff= coeff*0.5 + 0.5;
}
else if(flags & SWS_AREA)
{
double srcPixelSize= (1<<16)/(double)xInc;
double srcPixelSize= 1.0/xInc1;
if(d + srcPixelSize/2 < 0.5) coeff= 1.0;
else if(d - srcPixelSize/2 < 0.5) coeff= (0.5-d)/srcPixelSize + 0.5;
else coeff=0.0;
}
else
else if(flags & SWS_GAUSS)
{
double p= param ? param*0.1 : 3.0;
coeff = pow(2.0, - p*d*d);
}
else if(flags & SWS_SINC)
{
coeff = d ? sin(d*PI)/(d*PI) : 1.0;
}
else if(flags & SWS_LANCZOS)
{
double p= param ? param : 3.0;
coeff = d ? sin(d*PI)*sin(d*PI/p)/(d*d*PI*PI/p) : 1.0;
if(d>p) coeff=0;
}
else if(flags & SWS_BILINEAR)
{
coeff= 1.0 - d;
if(coeff<0) coeff=0;
}
else if(flags & SWS_SPLINE)
{
double p=-2.196152422706632;
coeff = getSplineCoeff(1.0, 0.0, p, -p-1.0, d);
}
else ASSERT(0)
filter[i*filterSize + j]= coeff;
xx++;
}
xDstInSrc+= xInc;
xDstInSrc+= xInc1;
}
}
......@@ -2178,7 +2219,15 @@ SwsContext *getSwsContext(int srcW, int srcH, int srcFormat, int dstW, int dstH,
else if(flags&SWS_AREA)
MSG_INFO("\nSwScaler: Area Averageing scaler, ");
else if(flags&SWS_BICUBLIN)
MSG_INFO("\nSwScaler: luma BICUBIC / chroma BILINEAR, ");
MSG_INFO("\nSwScaler: luma BICUBIC / chroma BILINEAR scaler, ");
else if(flags&SWS_GAUSS)
MSG_INFO("\nSwScaler: Gaussian scaler, ");
else if(flags&SWS_SINC)
MSG_INFO("\nSwScaler: Sinc scaler, ");
else if(flags&SWS_LANCZOS)
MSG_INFO("\nSwScaler: Lanczos scaler, ");
else if(flags&SWS_SPLINE)
MSG_INFO("\nSwScaler: Bicubic spline scaler, ");
else
MSG_INFO("\nSwScaler: ehh flags invalid?! ");
......
swscale.h
View file @ e68c321d
......@@ -24,18 +24,26 @@
#define SWS_POINT 0x10
#define SWS_AREA 0x20
#define SWS_BICUBLIN 0x40
#define SWS_GAUSS 0x80
#define SWS_SINC 0x100
#define SWS_LANCZOS 0x200
#define SWS_SPLINE 0x400
#define SWS_SRC_V_CHR_DROP_MASK 0x300
#define SWS_SRC_V_CHR_DROP_SHIFT 8
#define SWS_SRC_V_CHR_DROP_MASK 0x30000
#define SWS_SRC_V_CHR_DROP_SHIFT 16
//the following 4 flags are not completly implemented
#define SWS_PARAM_MASK 0x3FC0000
#define SWS_PARAM_SHIFT 18
#define SWS_PRINT_INFO 0x1000
//the following 3 flags are not completly implemented
//internal chrominace subsamling info
#define SWS_FULL_CHR_H_INT 0x2000
//input subsampling info
#define SWS_FULL_CHR_H_INP 0x4000
#define SWS_DIRECT_BGR 0x8000
#define SWS_PRINT_INFO 0x1000
#define SWS_MAX_REDUCE_CUTOFF 0.002
......
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