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routines.c
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routines.c
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#include "dct.h"
void matr_mult(double a[4][4], double b[4][4], double c[4][4])
{
register int i,j,k;
for (i=0; i<4; i++)
for (j=0; j<4; j++)
{
c[i][j]=0.0;
for (k=0; k<4; k++) c[i][j]+=a[i][k]*b[k][j];
}
}
void initCoefs(double Amatr[4][4], short flag)
{
double a,b,c;
if (flag != ISH264)
{
a=0.5; b=sqrt(0.5)*cos(M_PI/8); c=sqrt(0.5)*cos(3*M_PI/8);
Amatr[0][0]=Amatr[0][1]=Amatr[0][2]=Amatr[0][3]=a;
Amatr[1][0]=b;Amatr[1][1]=c;Amatr[1][2]=-c;Amatr[1][3]=-b;
Amatr[2][0]=Amatr[2][3]=a;Amatr[2][1]=Amatr[2][2]=-a;
Amatr[3][0]=c;Amatr[3][1]=-b;Amatr[3][2]=b;Amatr[3][3]=-c;
}
else
{
a=0.5;b=sqrt(0.4);
Amatr[0][0]=Amatr[2][0]=Amatr[0][2]=Amatr[2][2]=a*a;
Amatr[1][0]=Amatr[0][1]=Amatr[1][2]=Amatr[2][1]=Amatr[2][3]=Amatr[3][2]=Amatr[0][3]=Amatr[3][0]=(a*b)/2;
Amatr[1][1]=Amatr[1][3]=Amatr[3][1]=Amatr[3][3]=(b*b)/4;
}
}
void clearMatr16(double m[4][4])
{
register int i,j;
for (i=0;i<4;i++)
for (j=0;j<4;j++) m[i][j]=0.0;
}
void transposeMatr(double a[4][4], double aT[4][4])
{
register int i,j;
for (i=0; i<4; i++)
for (j=0; j<4 ; j++)
aT[i][j]=a[j][i];
}
void readFrame(FILE *rawv, uchar theframe[MAXHEIGHT][MAXWIDTH], int h, int w)
{
uchar Ybuf[h*w];
int YLEN=h*w;
register int i,j,k=0;
fread(Ybuf, 1, YLEN, rawv);
if (ferror(rawv)!=0)
{
perror("readFrame()");
exit(2);
}
for (j=0; j<w; j++)
for (i=0;i<h;i++) theframe[i][j]=Ybuf[k++];
fread(Ybuf, 1, (int)(YLEN/2), rawv); /* Skip chroma data */
if (ferror(rawv)!=0)
{
perror("readFrame()");
exit(2);
}
return;
}
void performDCT(uchar theframe[MAXHEIGHT][MAXWIDTH], int h, int w)
{
register int i,j,k,l,q,p,m;
double submatr[ARRAYS][4][4], X[4][4],Y[ARRAYS][4][4], energies[4][4];
double Ytemp[4][4];
double macblocks=h*w, arrs=macblocks/16.0; //'macblocks' = How many Macroblocks. 'arrs'=Denominator to calculate average energies
initCoefs(A,0); transposeMatr(A, AT);
clearMatr16(energies);
k=0;l=0;m=0;
/* The DCT itself */
do
{
for (i=l;i<l+4;i++)
for (j=k;j<k+4;j++) X[i-l][j-k]=theframe[i][j];
matr_mult(A,X,Ytemp);
matr_mult(Ytemp, AT, Y[m]);
for (q=0; q<4; q++)
for (p=0;p<4;p++)
energies[q][p]+=Y[m][q][p]*Y[m][q][p];
m++;
k=(k+4)%w; /*k+=4; if (k>=w) k=0;*/
if (k==0) l+=4;
}
while (l<h);
printf("DONE!\n");
/* Now, let's calculate energy. */
l=0;
for (i=0; i<4; i++)
for (j=0;j<4;j++) printf("%d.Average Energy for [%d , %d] is %.3lf\n", ++l,i+1,j+1,energies[i][j]/arrs);
putchar('\n');
initCoefs(A,ISH264);
C[0][0]=C[0][1]=C[0][2]=C[0][3]=1.0;
C[1][0]=2.0;C[1][1]=1;C[1][2]=-1.0;C[1][3]=-2.0;
C[2][0]=1.0;C[2][1]=C[2][2]=-1.0;C[2][3]=1.0;
C[3][0]=1;C[3][1]=-2.0;C[3][2]=2.0;C[3][3]=-1.0;
transposeMatr(C,CT);
clearMatr16(energies);
/* Perform DCT (with "rounded" constants) for each 4x4 submatrix */
/**********
m=0;k=0;l=0;
do
{
for (i=l;i<l+4;i++)
for (j=k;j<k+4;j++) X[i-l][j-k]=theframe[i][j];
matr_mult(C,X,Ytemp);
matr_mult(Ytemp, CT, Y[m]);
for (q=0; q<4; q++)
for (p=0;p<4;p++)
{
Y[m][p][q]*=A[p][q];
energies[q][p]+=Y[m][q][p]*Y[m][q][p];
}
m++;
k=(k+4)%w;
if (k==0) l+=4;
}
while (l<h);
printf("H.264 \"rounded\" completed!\n");
l=0;
for (i=0; i<4; i++)
for (j=0;j<4;j++) printf("%d.Average Energy for [%d , %d] is %.3lf\n", ++l,i+1,j+1,energies[i][j]/(double)arrs);
putchar('\n');
**********/
return;
}