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/* (C) 1998 Justin Schoeman */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
struct jfs_cmd
{
char cmd[256];
unsigned int len;
};
struct jfs_cmd jfs_cmd_tab[256]; /* Maximum 256 commands */
int jfs_stream[256][256];
unsigned int jfs_first[256];
unsigned int jfs_size=-1;
unsigned char *sframe, *tframe;
int jfs_width, jfs_height;
void jfs_getit(int group, unsigned int frame)
{
unsigned char t1, t2;
int file=0, i;
unsigned int thisframe;
frame=(frame<<1)+jfs_first[group];
read(jfs_stream[group][file], &thisframe, sizeof(thisframe));
lseek(jfs_stream[group][file], -sizeof(thisframe), SEEK_CUR);
if(frame>thisframe) /* search forwards */
{
while(frame>thisframe)
{
if(jfs_stream[group][++file]==-1)
{
for(file--; file>=0; file--)
lseek(jfs_stream[group][file], jfs_size+sizeof(thisframe), SEEK_CUR);
file++;
}
read(jfs_stream[group][file], &thisframe, sizeof(thisframe));
lseek(jfs_stream[group][file], -sizeof(thisframe), SEEK_CUR);
}
if(thisframe!=frame) /* forward too far - go back 1 */
{
if(file==0)
while(jfs_stream[group][file]!=-1)
lseek(jfs_stream[group][file++], -(jfs_size+sizeof(thisframe)), SEEK_CUR);
file--;
read(jfs_stream[group][file], &thisframe, sizeof(thisframe));
lseek(jfs_stream[group][file], -sizeof(thisframe), SEEK_CUR);
}
} else if(frame<thisframe)
{
while(frame<thisframe) /* search backward */
{
if(file==0)
while(jfs_stream[group][file]!=-1)
lseek(jfs_stream[group][file++], -(jfs_size+sizeof(thisframe)), SEEK_CUR);
file--;
read(jfs_stream[group][file], &thisframe, sizeof(thisframe));
lseek(jfs_stream[group][file], -sizeof(thisframe), SEEK_CUR);
}
}
lseek(jfs_stream[group][file], sizeof(thisframe), SEEK_CUR);
fprintf(stderr,"Frame requested: %u Frame retrieved: %u\n", frame, thisframe);
for (i=0; i<(jfs_size>>1); i++)
{
read(jfs_stream[group][file], &t1, sizeof(t1));
read(jfs_stream[group][file], &t2, sizeof(t2));
sframe[i*3]=t2&0xf8;
sframe[(i*3)+1]=((t2<<5)&0xe0)|((t1>>3)&0x1c);
sframe[(i*3)+2]=(t1<<3)&0xf8;
}
lseek(jfs_stream[group][file], -(sizeof(thisframe)+jfs_size), SEEK_CUR); /* lets keep our file pointers nice and orderly */
}
unsigned char *getframe(char *fname)
{
char name[1024], junk[1024];
unsigned int newframe, bmark;
int i,j,k,l,m;
FILE *cliptab;
for(i=0; fname[i]!=':'; i++)name[i]=fname[i];
name[i]=(char)0;
newframe=(unsigned int)atoi(&fname[i+1]);
if(jfs_size==-1) /* First time - open file and get details */
{
fprintf(stderr, "INITIALISING VIDEO FILES\n");
sprintf(&(name[i]), ":cliptab");
cliptab=fopen(name, "r");
if(!cliptab)
{
perror("open cliptab");
exit(-1);
}
i=0;
while(strcmp(fgets(name, 1024, cliptab),"*\n")!=0)
{
strcpy(&(name[strlen(name)])," !!END!! ");
fprintf(stderr, "group %d: ", i);
j=0;
sscanf(name, "%s %1024c", junk, name);
while(strcmp(junk,"!!END!!")!=0)
{
if(j==0)j++; /* skip audio file */
else
{
fprintf(stderr, "[%s]", junk);
jfs_stream[i][j-1]=open(junk, O_RDONLY);
if(jfs_stream[i][j-1]<=0)
{
perror("open video file");
exit(-1);
}
j++;
}
sscanf(name, "%s %1024c", junk, name);
}
jfs_stream[i][j-1]=-1;
fprintf(stderr,"\n");
read(jfs_stream[i][0], &jfs_width, sizeof(jfs_width)); /* width */
read(jfs_stream[i][0], &jfs_height, sizeof(jfs_height)); /* height */
read(jfs_stream[i][0], &jfs_first[i], sizeof(jfs_first[i])); /* dummy for lastfield */
read(jfs_stream[i][0], &jfs_first[i], sizeof(jfs_first[i]));
lseek(jfs_stream[i][0], -sizeof(jfs_first[i]), SEEK_CUR);
i++;
}
jfs_size=jfs_width*jfs_height*2;
sframe=(unsigned char*)malloc(jfs_width*jfs_height*3);
if(sframe==NULL)
{
fprintf(stderr,"Couldn't allocate storage for sframe\n");
exit(-1);
}
tframe=(unsigned char*)malloc(jfs_width*jfs_height*3);
if(tframe==NULL)
{
fprintf(stderr,"Couldn't allocate storage for tframe\n");
exit(-1);
}
i=0;
while(fgets(&(jfs_cmd_tab[i].cmd[0]), 256, cliptab))
{
switch(jfs_cmd_tab[i].cmd[0])
{
case 'B': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d", &(junk[0]), &j, &k, &(jfs_cmd_tab[i].len));
fprintf(stderr, "Block group %u start %u length %u\n", j, k, jfs_cmd_tab[i].len);
break;
case 'F': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d", &(junk[0]), &j, &k, &(jfs_cmd_tab[i].len));
fprintf(stderr, "Block group %u start %u length %u (fade to black)\n", j, k, jfs_cmd_tab[i].len);
break;
case 'f': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d", &(junk[0]), &j, &k, &(jfs_cmd_tab[i].len));
fprintf(stderr, "Block group %u start %u length %u (fade from black)\n", j, k, jfs_cmd_tab[i].len);
break;
case 'O': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d %d %d", &(junk[0]), &j, &k, &(jfs_cmd_tab[i].len), &l, &m);
fprintf(stderr, "Block group %u start %u length %u (OV group %u start %u)\n", j, k, jfs_cmd_tab[i].len, l, m);
break;
case 'X': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d %d %d", &(junk[0]), &j, &k, &(jfs_cmd_tab[i].len), &l, &m);
fprintf(stderr, "Block group %u start %u length %u (mix to group %u start %u)\n", j, k, jfs_cmd_tab[i].len, l, m);
break;
default: fprintf(stderr, "Unknown edit command\n");
exit(-1);
}
i++;
}
}
fprintf(stderr, "Fetching frame %u = ", newframe);
bmark=0;
i=0;
while(newframe>=(bmark+=jfs_cmd_tab[i].len))i++;
switch(jfs_cmd_tab[i].cmd[0])
{
case 'B': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d", &(junk[0]), &j, &k, (int *)&(junk[0]));
newframe=(newframe-bmark)+k+jfs_cmd_tab[i].len;
fprintf(stderr, "%u of group %d.\n", newframe, j);
jfs_getit(j, newframe);
break;
case 'F': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d", &(junk[0]), &j, &k, (int *)&(junk[0]));
newframe=(newframe-bmark)+k+jfs_cmd_tab[i].len;
fprintf(stderr, "%u of group %d (fade %f).\n", newframe, j,(1-(float)(newframe-k)/(float)jfs_cmd_tab[i].len));
jfs_getit(j, newframe);
for(j=0; j<(jfs_width*jfs_height*3); j++)
sframe[j]=sframe[j]*(1-(float)((float)(newframe-k)/(float)(jfs_cmd_tab[i].len)));
break;
case 'f': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d", &(junk[0]), &j, &k, (int *)&(junk[0]));
newframe=(newframe-bmark)+k+jfs_cmd_tab[i].len;
fprintf(stderr, "%u of group %d (fade %f).\n", newframe, j,(float)(newframe-k)/(float)jfs_cmd_tab[i].len);
jfs_getit(j, newframe);
for(j=0; j<(jfs_width*jfs_height*3); j++)
sframe[j]=sframe[j]*((float)((float)(newframe-k)/(float)(jfs_cmd_tab[i].len)));
break;
case 'X': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d %d %d", &(junk[0]), &j, &k, (int *)&(junk[0]), &l, &m);
newframe=(newframe-bmark)+k+jfs_cmd_tab[i].len;
fprintf(stderr, "%u of group %d.\n", newframe, j);
jfs_getit(j, newframe);
bcopy(sframe, tframe, (jfs_width*jfs_height*3));
newframe=(newframe-k)+m;
fprintf(stderr, "Mix to = %u of group %d.\n", newframe, l);
jfs_getit(l, newframe);
for(j=0; j<(jfs_width*jfs_height*3); j++)
sframe[j]=tframe[j]*(1-((float)(newframe-m)/(float)(jfs_cmd_tab[i].len)))+sframe[j]*((float)(newframe-m)/(float)(jfs_cmd_tab[i].len));
break;
case 'O': sscanf(jfs_cmd_tab[i].cmd, "%c %d %d %d %d %d", &(junk[0]), &j, &k, (int *)&(junk[0]), &l, &m);
newframe=(newframe-bmark)+k+jfs_cmd_tab[i].len;
fprintf(stderr, "%u of group %d.\n", newframe, j);
jfs_getit(j, newframe);
bcopy(sframe, tframe, (jfs_width*jfs_height*3));
newframe=(newframe-k)+m;
fprintf(stderr, "Overlay = %u of group %d.\n", newframe, l);
jfs_getit(l, newframe);
for(i=0; i<(jfs_width*jfs_height); i++)
if((sframe[i*3]==0)&(sframe[(i*3)+1]==0)&(sframe[(i*3)+2]==0))
{
sframe[i*3]=tframe[i*3];
sframe[(i*3)+1]=tframe[(i*3)+1];
sframe[(i*3)+2]=tframe[(i*3)+2];
}
break;
default: fprintf(stderr, "Unknown edit command\n");
exit(-1);
}
return sframe;
}
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