static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags)
{
SwsVector *vec;
SwsFilter sws_filter;
vec = sws_getGaussianVec(f->radius, f->quality);
if (!vec)
return 0;
sws_scaleVec(vec, f->strength);
vec->coeff[vec->length / 2] += 1.0 - f->strength;
sws_filter.lumH = sws_filter.lumV = vec;
sws_filter.chrH = sws_filter.chrV = NULL;
f->filter_context = sws_getCachedContext(NULL,
width, height, AV_PIX_FMT_GRAY8,
width, height, AV_PIX_FMT_GRAY8,
flags, &sws_filter, NULL, NULL);
sws_freeVec(vec);
if (!f->filter_context)
return 0;
return 1;
}
static int allocStuff(FilterParam *f, int width, int height){
int stride= (width+7)&~7;
SwsVector *vec;
SwsFilter swsF;
int i,x,y;
f->preFilterBuf= (uint8_t*)memalign(8, stride*height);
f->preFilterStride= stride;
vec = sws_getGaussianVec(f->preFilterRadius, f->quality);
swsF.lumH= swsF.lumV= vec;
swsF.chrH= swsF.chrV= NULL;
f->preFilterContext= sws_getContext(
width, height, PIX_FMT_GRAY8, width, height, PIX_FMT_GRAY8, get_sws_cpuflags()|SWS_POINT, &swsF, NULL, NULL);
sws_freeVec(vec);
vec = sws_getGaussianVec(f->strength, 5.0);
for(i=0; i<512; i++){
double d;
int index= i-256 + vec->length/2;
if(index<0 || index>=vec->length) d= 0.0;
else d= vec->coeff[index];
f->colorDiffCoeff[i]= (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5);
}
sws_freeVec(vec);
vec = sws_getGaussianVec(f->radius, f->quality);
f->distWidth= vec->length;
f->distStride= (vec->length+7)&~7;
f->distCoeff= (int32_t*)memalign(8, f->distWidth*f->distStride*sizeof(int32_t));
for(y=0; y<vec->length; y++){
for(x=0; x<vec->length; x++){
double d= vec->coeff[x] * vec->coeff[y];
f->distCoeff[x + y*f->distStride]= (int)(d*(1<<10) + 0.5);
// if(y==vec->length/2)
// printf("%6d ", f->distCoeff[x + y*f->distStride]);
}
}
sws_freeVec(vec);
return 0;
}
static int allocStuff(FilterParam *f, int width, int height){
SwsVector *vec;
SwsFilter swsF;
vec = sws_getGaussianVec(f->radius, f->quality);
sws_scaleVec(vec, f->strength);
vec->coeff[vec->length/2]+= 1.0 - f->strength;
swsF.lumH= swsF.lumV= vec;
swsF.chrH= swsF.chrV= NULL;
f->filterContext= sws_getContext(
width, height, PIX_FMT_GRAY8, width, height, PIX_FMT_GRAY8, SWS_BICUBIC, &swsF, NULL, NULL);
sws_freeVec(vec);
return 0;
}
