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Code Issues Releases Activity

area averageing scaling support (-sws 5) (is identical to bilinear for upscale)

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Originally committed as revision 4403 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc
This commit is contained in:
Michael Niedermayer 2002-01-29 01:43:15 +00:00
parent ff7ba85694
commit d8863d37e2
2 changed files with 18 additions and 8 deletions
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25
postproc/swscale.c
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@ -604,6 +604,7 @@ void SwScale_YV12slice(unsigned char* src[], int srcStride[], int srcSliceY ,
case 2: flags|= SWS_BICUBIC; break;
case 3: flags|= SWS_X; break;
case 4: flags|= SWS_POINT; break;
case 5: flags|= SWS_AREA; break;
default:flags|= SWS_BILINEAR; break;
}
@ -666,7 +667,7 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
int xDstInSrc;
if (flags&SWS_BICUBIC) filterSize= 4;
else if(flags&SWS_X ) filterSize= 4;
else filterSize= 2;
else filterSize= 2; // SWS_BILINEAR / SWS_AREA
// printf("%d %d %d\n", filterSize, srcW, dstW);
filter= (double*)memalign(8, dstW*sizeof(double)*filterSize);
@ -705,6 +706,7 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
}
else
{
//Bilinear upscale / linear interpolate / Area averaging
for(j=0; j<filterSize; j++)
{
double d= ABS((xx<<16) - xDstInSrc)/(double)(1<<16);
@ -721,9 +723,10 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
else // downscale
{
int xDstInSrc;
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 filterSize= (int)ceil(1 + 2.0*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);
// printf("%d %d %d\n", *filterSize, srcW, dstW);
filter= (double*)memalign(8, dstW*sizeof(double)*filterSize);
@ -749,15 +752,19 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
else
coeff=0.0;
}
/* else if(flags & SWS_X)
else if(flags & SWS_AREA)
{
}*/
double srcPixelSize= (1<<16)/(double)xInc;
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
{
coeff= 1.0 - d;
if(coeff<0) coeff=0;
}
// printf("%1.3f %d %d \n", coeff, (int)d, xDstInSrc);
// printf("%1.3f %2.3f %d \n", coeff, d, xDstInSrc);
filter[i*filterSize + j]= coeff;
xx++;
}
@ -1225,7 +1232,9 @@ SwsContext *getSwsContext(int srcW, int srcH, int srcFormat, int dstW, int dstH,
else if(flags&SWS_BICUBIC)
fprintf(stderr, "\nSwScaler: BICUBIC scaler ");
else if(flags&SWS_POINT)
fprintf(stderr, "\nSwScaler: POINT scaler ");
fprintf(stderr, "\nSwScaler: Nearest Neighbor / POINT scaler ");
else if(flags&SWS_AREA)
fprintf(stderr, "\nSwScaler: Area Averageing scaler ");
else
fprintf(stderr, "\nSwScaler: ehh flags invalid?! ");

1
postproc/swscale.h
View File

@ -22,6 +22,7 @@
#define SWS_BICUBIC 4
#define SWS_X 8
#define SWS_POINT 0x10
#define SWS_AREA 0x20
#define SWS_FULL_UV_IPOL 0x100
#define SWS_PRINT_INFO 0x1000