JM中的有用程序
JM中的有用程序
#if 0
/*
* 1. dct方法
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define M 16
#define BLOCK_SIZE 4
static int tmp[M];
void forward4x4(int (*block)[M], int (*tblock)[M], int pos_y, int pos_x)
{
int i, ii;
int *pTmp = tmp, *pblock;
static int p0,p1,p2,p3;
static int t0,t1,t2,t3;
// Horizontal
for (i=pos_y; i < pos_y + BLOCK_SIZE; i++)
{
pblock = &block[i][pos_x];
p0 = *(pblock++);
p1 = *(pblock++);
p2 = *(pblock++);
p3 = *(pblock );
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
*(pTmp++) = t0 + t1;
*(pTmp++) = (t3 << 1) + t2;
*(pTmp++) = t0 - t1;
*(pTmp++) = t3 - (t2 << 1);
}
// Vertical
for (i=0; i < BLOCK_SIZE; i++)
{
pTmp = tmp + i;
p0 = *pTmp;
p1 = *(pTmp += BLOCK_SIZE);
p2 = *(pTmp += BLOCK_SIZE);
p3 = *(pTmp += BLOCK_SIZE);
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
ii = pos_x + i;
tblock[pos_y ][ii] = t0 + t1;
tblock[pos_y + 1][ii] = t2 + (t3 << 1);
tblock[pos_y + 2][ii] = t0 - t1;
tblock[pos_y + 3][ii] = t3 - (t2 << 1);
}
}
void print_arr(int arr[][M],int n)
{
int j,i;
for(j=0;j<n;j++)
{
for(i=0;i<M;i++)
printf("%8d",arr[j][i]);
printf("\n");
}
}
int main()
{
int orig[M][M];
int dct[M][M];
int j,i;
// srand((int)time(NULL));
for(j=0;j<M;j++)
for(i=0;i<M;i++)
orig[j][i]=rand()%100;
print_arr(orig,M);
for(j=0;j<M;j+=4)
{
for(i=0;i<M;i+=4)
forward4x4(orig,dct,j,i);
}
print_arr(dct,M);
}
#endif
#if 0
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define M 16
#define BLOCK_SIZE 4
static int tmp[16];
void forward4x4(int **block, int **tblock, int pos_y, int pos_x)
{
int i, ii;
int *pTmp = tmp, *pblock;
static int p0,p1,p2,p3;
static int t0,t1,t2,t3;
// Horizontal
for (i=pos_y; i < pos_y + BLOCK_SIZE; i++)
{
pblock = &block[i][pos_x];
p0 = *(pblock++);
p1 = *(pblock++);
p2 = *(pblock++);
p3 = *(pblock );
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
*(pTmp++) = t0 + t1;
*(pTmp++) = (t3 << 1) + t2;
*(pTmp++) = t0 - t1;
*(pTmp++) = t3 - (t2 << 1);
}
// Vertical
for (i=0; i < BLOCK_SIZE; i++)
{
pTmp = tmp + i;
p0 = *pTmp;
p1 = *(pTmp += BLOCK_SIZE);
p2 = *(pTmp += BLOCK_SIZE);
p3 = *(pTmp += BLOCK_SIZE);
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
ii = pos_x + i;
tblock[pos_y ][ii] = t0 + t1;
tblock[pos_y + 1][ii] = t2 + (t3 << 1);
tblock[pos_y + 2][ii] = t0 - t1;
tblock[pos_y + 3][ii] = t3 - (t2 << 1);
}
}
void print_arr(int **arr,int n,int m)
{
int j,i;
for(j=0;j<n;j++)
{
for(i=0;i<m;i++)
printf("%8d",arr[j][i]);
printf("\n");
}
}
int main()
{
int **orig;
int **dct;
int j,i;
// srand((int)time(NULL));
orig=malloc(sizeof(int*)*M);
dct=malloc(sizeof(int*)*M);
for(j=0;j<M;j++)
{
orig[j]=malloc(sizeof(int)*M);
dct[j]=malloc(sizeof(int)*M);
}
for(j=0;j<M;j++)
for(i=0;i<M;i++)
orig[j][i]=rand()%100;
print_arr(orig,M,M);
for(j=0;j<M;j+=4)
{
for(i=0;i<M;i+=4)
forward4x4(orig,dct,j,i);
}
print_arr(dct,M,M);
for(j=0;j<M;j++)
{
free(orig[j]);
free(dct[j]);
}
free(orig);
free(dct);
}
#endif
#if 0
2. splityuv 函数
#if 1
/*
* 13. 截取YUV中的某些帧
*/
#include <stdio.h>
#include <stdlib.h>
typedef unsigned char byte;
int main(int argc,char*argv[])
{
char *yuvpath;
char outpath[100];
int from,to;
FILE *p_in,*p_out;
int height, width;
int framebytes;
byte *buf;
if(argc<2) {
printf("Usage:splityuv xxx.yuv from to \n");
exit(-1);
}
yuvpath=argv[1];
if(argc<3)
from=0;
else {
int tmp=atoi(argv[2]);
from=tmp>=0?tmp:0;
}
if(argc<4)
to=130;
else {
int tmp=atoi(argv[3]);
to=tmp>0?tmp:130;
}
if(argc<5) {
height=144;
width=176;
}
else {
int tmph=atoi(argv[4]);
int tmpw=atoi(argv[5]);
height=tmph>0?tmph:144;
width=tmpw>0?tmpw:176;
}
framebytes=height*width+height/2*width/2*2;
if(NULL==(buf=(byte*)calloc(framebytes,sizeof(byte)))) {
printf("Merrory allocate error!\n");
exit(-1);
}
sprintf(outpath,"%s_%d_%d",yuvpath,from,to);
if(NULL==(p_in=fopen(yuvpath,"r"))) {
printf("open file error\n");
exit(-4);
}
if(NULL==(p_out=fopen(outpath,"w"))) {
printf("open file error\n");
exit(-4);
}
{
int i;
for(i=from;i<to;++i)
{
if(-1==fseek(p_in,framebytes*i,SEEK_SET))
{
printf("read yuv file error\n");
exit(10);
}
if(framebytes!=fread(buf,sizeof(byte),framebytes,p_in))
{
printf("read file error\n");
exit(-3);
}
if(-1==fseek(p_out,framebytes*i,SEEK_SET))
{
printf("read yuv file error\n");
exit(10);
}
if(framebytes!=fwrite(buf,sizeof(byte),framebytes,p_out))
{
printf("write file error\n");
exit(-7);
}
}
}
fclose(p_in);
fclose(p_out);
free(buf);
return 0;
}
#endif
#if 0
3. 读取一帧图像
/*
* Description: 读取yuv视频文件中的某一帧
*/
#include <stdio.h>
#include <stdlib.h>
typedef unsigned char byte;
byte**y;
byte**u;
byte**v;
void getimgdata(FILE*p_in,int fno,int height,int width);
void memalloc(byte***src,int row,int col);
void freemem(byte**src,int row);
int main(int argc,char*argv[])
{
char *yuvpath;
int framenumber;
FILE *p_in;
int height;
int width;
if(argc<2)
{
printf("Usage:readimg xxx.yuv fno height width \n");
exit(-1);
}
yuvpath=argv[1];
if(argc<3)
{
framenumber=0;
}
else
{
framenumber=atoi(argv[2]);
}
if(argc<5)
{
height=144;
width=176;
}
else
{
height=atoi(argv[3]);
width=atoi(argv[4]);
}
memalloc(&y,height,width);
memalloc(&u,height/2,width/2);
memalloc(&v,height/2,width/2);
if(NULL==(p_in=fopen(yuvpath,"r")))
{
printf("open file error\n");
exit(-4);
}
getimgdata(p_in,framenumber,height,width);
{
FILE *p_y,*p_u,*p_v;
FILE *p_y2,*p_u2,*p_v2;
int i,j;
char yname[20]="y";
char yname2[20]="y";
char uname[20]="u";
char uname2[20]="u";
char vname[20]="v";
char vname2[20]="v";
sprintf(yname,"%s_%d.txt",yname,framenumber);
sprintf(yname2,"%s_%d.bin",yname2,framenumber);
sprintf(uname,"%s_%d.txt",uname,framenumber);
sprintf(uname2,"%s_%d.bin",uname2,framenumber);
sprintf(vname,"%s_%d.txt",vname,framenumber);
sprintf(vname2,"%s_%d.bin",vname2,framenumber);
if(NULL==(p_y=fopen(yname,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_u=fopen(uname,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_v=fopen(vname,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_y2=fopen(yname2,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_u2=fopen(uname2,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_v2=fopen(vname2,"w")))
{
printf("open file error\n");
exit(-4);
}
for(j=0;j<height;j++)
{
for(i=0;i<width;i++)
{
fprintf(p_y,"%d ",y[j][i]);
}
fprintf(p_y,"\n");
fwrite(y[j],sizeof(byte),width,p_y2);
}
for(j=0;j<height/2;j++)
{
for(i=0;i<width/2;i++)
{
fprintf(p_u,"%d ",u[j][i]);
fprintf(p_v,"%d ",v[j][i]);
}
fprintf(p_u,"\n");
fprintf(p_v,"\n");
fwrite(u[j],sizeof(byte),width/4,p_u2);
fwrite(v[j],sizeof(byte),width/4,p_v2);
}
fclose(p_y);
fclose(p_u);
fclose(p_v);
fclose(p_y2);
fclose(p_u2);
fclose(p_v2);
}
freemem(y,height);
freemem(u,height/2);
freemem(v,height/2);
return 0;
}
void getimgdata(FILE*p_in,int fno,int height,int width)
{
int bytes_y=height*width;
int bytes_uv=height/2*width/2;
int frame_bytes=bytes_y+bytes_uv*2;
byte*buf;
byte*buf_y;
byte*buf_u;
byte*buf_v;
if(-1==fseek(p_in,frame_bytes*fno,SEEK_SET))
{
printf("read yuv file error\n");
exit(10);
}
if(NULL==y||NULL==u||NULL==v)
{
printf("y/u/v:no memory allocation\n");
exit(-2);
}
if(NULL==(buf=(byte*)calloc(frame_bytes,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(NULL==(buf_y=(byte*)calloc(bytes_y,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(NULL==(buf_u=(byte*)calloc(bytes_uv,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(NULL==(buf_v=(byte*)calloc(bytes_uv,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(frame_bytes!=fread(buf,sizeof(byte),frame_bytes,p_in))
{
printf("read file error\n");
exit(-3);
}
memcpy(buf_y,buf,bytes_y);
memcpy(buf_u,buf+bytes_y,bytes_uv);
memcpy(buf_v,buf+bytes_y+bytes_uv,bytes_uv);
{
int j;
for(j=0;j<height;j++)
memcpy(y[j],buf_y+j*width,width);
for(j=0;j<height/2;j++)
{
memcpy(u[j],buf_u+j*width/2,width/2);
memcpy(v[j],buf_v+j*width/2,width/2);
}
}
free(buf);
free(buf_y);
free(buf_u);
free(buf_v);
}
void memalloc(byte***src,int row,int col)
{
int i;
*src=(byte**)calloc(row,sizeof(byte*));
for(i=0;i<row;i++)
(*src)[i]=(byte*)calloc(col,sizeof(byte));
}
void freemem(byte**src,int row)
{
int i;
for(i=0;i<row;i++)
free(src[i]);
free(src);
}
/*
* 17. 根据坐标来计算角度
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define PI 3.1415926
int main(int argc,char*argv[])
{
int y,x;
double dge;
double ddd;
double ddd2;
if(argc<3)
{
printf("wrong\n");
exit(-1);
}
y=atoi(argv[1]);
x=atoi(argv[2]);
if(x==0&&y==0)
{
printf("bad input \n");
exit(1);
}
if(x==0&&y>0)
ddd=PI/2;
else if(x==0&&y<0)
ddd=3*PI/2;
else if(y==0&&x>0)
ddd=0;
else if(y==0&&x<0)
ddd=PI;
else
{
dge=((double)y)/x;
printf("dge=%f\n",dge);
ddd=atan(dge);
if(ddd<0)
ddd+=PI;
}
printf("ddd=%f\n",ddd);
ddd2=ddd*180/PI;
printf("ddd2=%f\n",ddd2);
return 0;
}
#endif
/*
* 1. dct方法
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define M 16
#define BLOCK_SIZE 4
static int tmp[M];
void forward4x4(int (*block)[M], int (*tblock)[M], int pos_y, int pos_x)
{
int i, ii;
int *pTmp = tmp, *pblock;
static int p0,p1,p2,p3;
static int t0,t1,t2,t3;
// Horizontal
for (i=pos_y; i < pos_y + BLOCK_SIZE; i++)
{
pblock = &block[i][pos_x];
p0 = *(pblock++);
p1 = *(pblock++);
p2 = *(pblock++);
p3 = *(pblock );
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
*(pTmp++) = t0 + t1;
*(pTmp++) = (t3 << 1) + t2;
*(pTmp++) = t0 - t1;
*(pTmp++) = t3 - (t2 << 1);
}
// Vertical
for (i=0; i < BLOCK_SIZE; i++)
{
pTmp = tmp + i;
p0 = *pTmp;
p1 = *(pTmp += BLOCK_SIZE);
p2 = *(pTmp += BLOCK_SIZE);
p3 = *(pTmp += BLOCK_SIZE);
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
ii = pos_x + i;
tblock[pos_y ][ii] = t0 + t1;
tblock[pos_y + 1][ii] = t2 + (t3 << 1);
tblock[pos_y + 2][ii] = t0 - t1;
tblock[pos_y + 3][ii] = t3 - (t2 << 1);
}
}
void print_arr(int arr[][M],int n)
{
int j,i;
for(j=0;j<n;j++)
{
for(i=0;i<M;i++)
printf("%8d",arr[j][i]);
printf("\n");
}
}
int main()
{
int orig[M][M];
int dct[M][M];
int j,i;
// srand((int)time(NULL));
for(j=0;j<M;j++)
for(i=0;i<M;i++)
orig[j][i]=rand()%100;
print_arr(orig,M);
for(j=0;j<M;j+=4)
{
for(i=0;i<M;i+=4)
forward4x4(orig,dct,j,i);
}
print_arr(dct,M);
}
#endif
#if 0
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define M 16
#define BLOCK_SIZE 4
static int tmp[16];
void forward4x4(int **block, int **tblock, int pos_y, int pos_x)
{
int i, ii;
int *pTmp = tmp, *pblock;
static int p0,p1,p2,p3;
static int t0,t1,t2,t3;
// Horizontal
for (i=pos_y; i < pos_y + BLOCK_SIZE; i++)
{
pblock = &block[i][pos_x];
p0 = *(pblock++);
p1 = *(pblock++);
p2 = *(pblock++);
p3 = *(pblock );
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
*(pTmp++) = t0 + t1;
*(pTmp++) = (t3 << 1) + t2;
*(pTmp++) = t0 - t1;
*(pTmp++) = t3 - (t2 << 1);
}
// Vertical
for (i=0; i < BLOCK_SIZE; i++)
{
pTmp = tmp + i;
p0 = *pTmp;
p1 = *(pTmp += BLOCK_SIZE);
p2 = *(pTmp += BLOCK_SIZE);
p3 = *(pTmp += BLOCK_SIZE);
t0 = p0 + p3;
t1 = p1 + p2;
t2 = p1 - p2;
t3 = p0 - p3;
ii = pos_x + i;
tblock[pos_y ][ii] = t0 + t1;
tblock[pos_y + 1][ii] = t2 + (t3 << 1);
tblock[pos_y + 2][ii] = t0 - t1;
tblock[pos_y + 3][ii] = t3 - (t2 << 1);
}
}
void print_arr(int **arr,int n,int m)
{
int j,i;
for(j=0;j<n;j++)
{
for(i=0;i<m;i++)
printf("%8d",arr[j][i]);
printf("\n");
}
}
int main()
{
int **orig;
int **dct;
int j,i;
// srand((int)time(NULL));
orig=malloc(sizeof(int*)*M);
dct=malloc(sizeof(int*)*M);
for(j=0;j<M;j++)
{
orig[j]=malloc(sizeof(int)*M);
dct[j]=malloc(sizeof(int)*M);
}
for(j=0;j<M;j++)
for(i=0;i<M;i++)
orig[j][i]=rand()%100;
print_arr(orig,M,M);
for(j=0;j<M;j+=4)
{
for(i=0;i<M;i+=4)
forward4x4(orig,dct,j,i);
}
print_arr(dct,M,M);
for(j=0;j<M;j++)
{
free(orig[j]);
free(dct[j]);
}
free(orig);
free(dct);
}
#endif
#if 0
2. splityuv 函数
#if 1
/*
* 13. 截取YUV中的某些帧
*/
#include <stdio.h>
#include <stdlib.h>
typedef unsigned char byte;
int main(int argc,char*argv[])
{
char *yuvpath;
char outpath[100];
int from,to;
FILE *p_in,*p_out;
int height, width;
int framebytes;
byte *buf;
if(argc<2) {
printf("Usage:splityuv xxx.yuv from to \n");
exit(-1);
}
yuvpath=argv[1];
if(argc<3)
from=0;
else {
int tmp=atoi(argv[2]);
from=tmp>=0?tmp:0;
}
if(argc<4)
to=130;
else {
int tmp=atoi(argv[3]);
to=tmp>0?tmp:130;
}
if(argc<5) {
height=144;
width=176;
}
else {
int tmph=atoi(argv[4]);
int tmpw=atoi(argv[5]);
height=tmph>0?tmph:144;
width=tmpw>0?tmpw:176;
}
framebytes=height*width+height/2*width/2*2;
if(NULL==(buf=(byte*)calloc(framebytes,sizeof(byte)))) {
printf("Merrory allocate error!\n");
exit(-1);
}
sprintf(outpath,"%s_%d_%d",yuvpath,from,to);
if(NULL==(p_in=fopen(yuvpath,"r"))) {
printf("open file error\n");
exit(-4);
}
if(NULL==(p_out=fopen(outpath,"w"))) {
printf("open file error\n");
exit(-4);
}
{
int i;
for(i=from;i<to;++i)
{
if(-1==fseek(p_in,framebytes*i,SEEK_SET))
{
printf("read yuv file error\n");
exit(10);
}
if(framebytes!=fread(buf,sizeof(byte),framebytes,p_in))
{
printf("read file error\n");
exit(-3);
}
if(-1==fseek(p_out,framebytes*i,SEEK_SET))
{
printf("read yuv file error\n");
exit(10);
}
if(framebytes!=fwrite(buf,sizeof(byte),framebytes,p_out))
{
printf("write file error\n");
exit(-7);
}
}
}
fclose(p_in);
fclose(p_out);
free(buf);
return 0;
}
#endif
#if 0
3. 读取一帧图像
/*
* Description: 读取yuv视频文件中的某一帧
*/
#include <stdio.h>
#include <stdlib.h>
typedef unsigned char byte;
byte**y;
byte**u;
byte**v;
void getimgdata(FILE*p_in,int fno,int height,int width);
void memalloc(byte***src,int row,int col);
void freemem(byte**src,int row);
int main(int argc,char*argv[])
{
char *yuvpath;
int framenumber;
FILE *p_in;
int height;
int width;
if(argc<2)
{
printf("Usage:readimg xxx.yuv fno height width \n");
exit(-1);
}
yuvpath=argv[1];
if(argc<3)
{
framenumber=0;
}
else
{
framenumber=atoi(argv[2]);
}
if(argc<5)
{
height=144;
width=176;
}
else
{
height=atoi(argv[3]);
width=atoi(argv[4]);
}
memalloc(&y,height,width);
memalloc(&u,height/2,width/2);
memalloc(&v,height/2,width/2);
if(NULL==(p_in=fopen(yuvpath,"r")))
{
printf("open file error\n");
exit(-4);
}
getimgdata(p_in,framenumber,height,width);
{
FILE *p_y,*p_u,*p_v;
FILE *p_y2,*p_u2,*p_v2;
int i,j;
char yname[20]="y";
char yname2[20]="y";
char uname[20]="u";
char uname2[20]="u";
char vname[20]="v";
char vname2[20]="v";
sprintf(yname,"%s_%d.txt",yname,framenumber);
sprintf(yname2,"%s_%d.bin",yname2,framenumber);
sprintf(uname,"%s_%d.txt",uname,framenumber);
sprintf(uname2,"%s_%d.bin",uname2,framenumber);
sprintf(vname,"%s_%d.txt",vname,framenumber);
sprintf(vname2,"%s_%d.bin",vname2,framenumber);
if(NULL==(p_y=fopen(yname,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_u=fopen(uname,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_v=fopen(vname,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_y2=fopen(yname2,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_u2=fopen(uname2,"w")))
{
printf("open file error\n");
exit(-4);
}
if(NULL==(p_v2=fopen(vname2,"w")))
{
printf("open file error\n");
exit(-4);
}
for(j=0;j<height;j++)
{
for(i=0;i<width;i++)
{
fprintf(p_y,"%d ",y[j][i]);
}
fprintf(p_y,"\n");
fwrite(y[j],sizeof(byte),width,p_y2);
}
for(j=0;j<height/2;j++)
{
for(i=0;i<width/2;i++)
{
fprintf(p_u,"%d ",u[j][i]);
fprintf(p_v,"%d ",v[j][i]);
}
fprintf(p_u,"\n");
fprintf(p_v,"\n");
fwrite(u[j],sizeof(byte),width/4,p_u2);
fwrite(v[j],sizeof(byte),width/4,p_v2);
}
fclose(p_y);
fclose(p_u);
fclose(p_v);
fclose(p_y2);
fclose(p_u2);
fclose(p_v2);
}
freemem(y,height);
freemem(u,height/2);
freemem(v,height/2);
return 0;
}
void getimgdata(FILE*p_in,int fno,int height,int width)
{
int bytes_y=height*width;
int bytes_uv=height/2*width/2;
int frame_bytes=bytes_y+bytes_uv*2;
byte*buf;
byte*buf_y;
byte*buf_u;
byte*buf_v;
if(-1==fseek(p_in,frame_bytes*fno,SEEK_SET))
{
printf("read yuv file error\n");
exit(10);
}
if(NULL==y||NULL==u||NULL==v)
{
printf("y/u/v:no memory allocation\n");
exit(-2);
}
if(NULL==(buf=(byte*)calloc(frame_bytes,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(NULL==(buf_y=(byte*)calloc(bytes_y,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(NULL==(buf_u=(byte*)calloc(bytes_uv,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(NULL==(buf_v=(byte*)calloc(bytes_uv,sizeof(byte))))
{
printf("memorry allocation error\n");
exit(-1);
}
if(frame_bytes!=fread(buf,sizeof(byte),frame_bytes,p_in))
{
printf("read file error\n");
exit(-3);
}
memcpy(buf_y,buf,bytes_y);
memcpy(buf_u,buf+bytes_y,bytes_uv);
memcpy(buf_v,buf+bytes_y+bytes_uv,bytes_uv);
{
int j;
for(j=0;j<height;j++)
memcpy(y[j],buf_y+j*width,width);
for(j=0;j<height/2;j++)
{
memcpy(u[j],buf_u+j*width/2,width/2);
memcpy(v[j],buf_v+j*width/2,width/2);
}
}
free(buf);
free(buf_y);
free(buf_u);
free(buf_v);
}
void memalloc(byte***src,int row,int col)
{
int i;
*src=(byte**)calloc(row,sizeof(byte*));
for(i=0;i<row;i++)
(*src)[i]=(byte*)calloc(col,sizeof(byte));
}
void freemem(byte**src,int row)
{
int i;
for(i=0;i<row;i++)
free(src[i]);
free(src);
}
/*
* 17. 根据坐标来计算角度
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define PI 3.1415926
int main(int argc,char*argv[])
{
int y,x;
double dge;
double ddd;
double ddd2;
if(argc<3)
{
printf("wrong\n");
exit(-1);
}
y=atoi(argv[1]);
x=atoi(argv[2]);
if(x==0&&y==0)
{
printf("bad input \n");
exit(1);
}
if(x==0&&y>0)
ddd=PI/2;
else if(x==0&&y<0)
ddd=3*PI/2;
else if(y==0&&x>0)
ddd=0;
else if(y==0&&x<0)
ddd=PI;
else
{
dge=((double)y)/x;
printf("dge=%f\n",dge);
ddd=atan(dge);
if(ddd<0)
ddd+=PI;
}
printf("ddd=%f\n",ddd);
ddd2=ddd*180/PI;
printf("ddd2=%f\n",ddd2);
return 0;
}
#endif
