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Introduce and use sws_allocVec().

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Originally committed as revision 29536 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Ramiro Polla 2009-08-19 01:33:17 +00:00
parent 20484b90ec
commit 1aff375d41
2 changed files with 23 additions and 18 deletions
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36
libswscale/swscale.c
View File

@ -3240,20 +3240,28 @@ SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
return filter;
}
SwsVector *sws_allocVec(int length)
{
SwsVector *vec = av_malloc(sizeof(SwsVector));
if (!vec)
return NULL;
vec->length = length;
vec->coeff = av_malloc(sizeof(double) * length);
if (!vec->coeff)
av_freep(&vec);
return vec;
}
SwsVector *sws_getGaussianVec(double variance, double quality)
{
const int length= (int)(variance*quality + 0.5) | 1;
int i;
double *coeff= av_malloc(length*sizeof(double));
double middle= (length-1)*0.5;
SwsVector *vec= av_malloc(sizeof(SwsVector));
vec->coeff= coeff;
vec->length= length;
SwsVector *vec= sws_allocVec(length);
for (i=0; i<length; i++) {
double dist= i-middle;
coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*PI);
vec->coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*PI);
}
sws_normalizeVec(vec, 1.0);
@ -3264,14 +3272,10 @@ SwsVector *sws_getGaussianVec(double variance, double quality)
SwsVector *sws_getConstVec(double c, int length)
{
int i;
double *coeff= av_malloc(length*sizeof(double));
SwsVector *vec= av_malloc(sizeof(SwsVector));
vec->coeff= coeff;
vec->length= length;
SwsVector *vec= sws_allocVec(length);
for (i=0; i<length; i++)
coeff[i]= c;
vec->coeff[i]= c;
return vec;
}
@ -3397,14 +3401,10 @@ void sws_convVec(SwsVector *a, SwsVector *b)
SwsVector *sws_cloneVec(SwsVector *a)
{
double *coeff= av_malloc(a->length*sizeof(double));
int i;
SwsVector *vec= av_malloc(sizeof(SwsVector));
SwsVector *vec= sws_allocVec(a->length);
vec->coeff= coeff;
vec->length= a->length;
for (i=0; i<a->length; i++) coeff[i]= a->coeff[i];
for (i=0; i<a->length; i++) vec->coeff[i]= a->coeff[i];
return vec;
}

5
libswscale/swscale.h
View File

@ -181,6 +181,11 @@ int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
int *srcRange, int **table, int *dstRange,
int *brightness, int *contrast, int *saturation);
/**
* Allocates and returns an uninitialized vector with length coefficients.
*/
SwsVector *sws_allocVec(int length);
/**
* Returns a normalized Gaussian curve used to filter stuff
* quality=3 is high quality, lower is lower quality.