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mpv/subreader.c

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/*
* Subtitle reader with format autodetection
*
* Written by laaz
* Some code cleanup & realloc() by A'rpi/ESP-team
* dunnowhat sub format by szabi
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "subreader.h"
#define ERR (void *)-1
int sub_uses_time=0;
int sub_errs=0;
int sub_num=0; // number of subtitle structs
int sub_format=-1; // 0 for microdvd
// 1 for SubRip
// 2 for SubViewer
// 3 for SAMI (smi)
// 4 for vplayer format
// 5 for RT format
// 6 for ssa (Sub Station Alpha)
// 7 for ... erm ... dunnowhat. tell me if you know
int eol(char p) {
return (p=='\r' || p=='\n' || p=='\0');
}
static inline void trail_space(char *s) {
int i;
while (isspace(*s)) strcpy(s, s + 1);
i = strlen(s) - 1;
while (i > 0 && isspace(s[i])) s[i--] = '\0';
}
subtitle *sub_read_line_sami(FILE *fd, subtitle *current) {
static char line[1001];
static char *s = NULL;
char text[1000], *p, *q;
int state;
current->lines = current->start = current->end = 0;
state = 0;
/* read the first line */
if (!s)
if (!(s = fgets(line, 1000, fd))) return 0;
do {
switch (state) {
case 0: /* find "START=" */
s = strstr (s, "Start=");
if (s) {
current->start = strtol (s + 6, &s, 0) / 10;
state = 1; continue;
}
break;
case 1: /* find "<P" */
if ((s = strstr (s, "<P"))) { s += 2; state = 2; continue; }
break;
case 2: /* find ">" */
if ((s = strchr (s, '>'))) { s++; state = 3; p = text; continue; }
break;
case 3: /* get all text until '<' appears */
if (*s == '\0') { break; }
else if (*s == '<') { state = 4; }
else if (!strncasecmp (s, "&nbsp;", 6)) { *p++ = ' '; s += 6; }
else if (*s == '\r') { s++; }
else if (!strncasecmp (s, "<br>", 4) || *s == '\n') {
*p = '\0'; p = text; trail_space (text);
if (text[0] != '\0')
current->text[current->lines++] = strdup (text);
if (*s == '\n') s++; else s += 4;
}
else *p++ = *s++;
continue;
case 4: /* get current->end or skip <TAG> */
q = strstr (s, "Start=");
if (q) {
current->end = strtol (q + 6, &q, 0) / 10 - 1;
*p = '\0'; trail_space (text);
if (text[0] != '\0')
current->text[current->lines++] = strdup (text);
if (current->lines > 0) { state = 99; break; }
state = 0; continue;
}
s = strchr (s, '>');
if (s) { s++; state = 3; continue; }
break;
}
/* read next line */
if (state != 99 && !(s = fgets (line, 1000, fd))) return 0;
} while (state != 99);
return current;
}
char *sub_readtext(char *source, char **dest) {
int len=0;
char *p=source;
while ( !eol(*p) && *p!= '|' ) {
p++,len++;
}
*dest= (char *)malloc (len+1);
if (!dest) {return ERR;}
strncpy(*dest, source, len);
(*dest)[len]=0;
while (*p=='\r' || *p=='\n' || *p=='|') p++;
if (*p) return p; // not-last text field
else return NULL; // last text field
}
subtitle *sub_read_line_microdvd(FILE *fd,subtitle *current) {
char line[1001];
char line2[1001];
char *p, *next;
int i;
bzero (current, sizeof(current));
do {
if (!fgets (line, 1000, fd)) return NULL;
} while (sscanf (line, "{%ld}{%ld}%[^\r\n]", &(current->start), &(current->end),line2) <3);
p=line2;
next=p, i=0;
while ((next =sub_readtext (next, &(current->text[i])))) {
if (current->text[i]==ERR) {return ERR;}
i++;
if (i>=SUB_MAX_TEXT) { printf ("Too many lines in a subtitle\n");current->lines=i;return current;}
}
current->lines= ++i;
return current;
}
subtitle *sub_read_line_subrip(FILE *fd, subtitle *current) {
char line[1001];
int a1,a2,a3,a4,b1,b2,b3,b4;
char *p=NULL, *q=NULL;
int len;
bzero (current, sizeof(current));
while (!current->text[0]) {
if (!fgets (line, 1000, fd)) return NULL;
if (sscanf (line, "%d:%d:%d.%d,%d:%d:%d.%d",&a1,&a2,&a3,&a4,&b1,&b2,&b3,&b4) < 8) continue;
current->start = a1*360000+a2*6000+a3*100+a4;
current->end = b1*360000+b2*6000+b3*100+b4;
if (!fgets (line, 1000, fd)) return NULL;
p=q=line;
for (current->lines=1; current->lines < SUB_MAX_TEXT; current->lines++) {
for (q=p,len=0; *p && *p!='\r' && *p!='\n' && strncmp(p,"[br]",4); p++,len++);
current->text[current->lines-1]=(char *)malloc (len+1);
if (!current->text[current->lines-1]) return ERR;
strncpy (current->text[current->lines-1], q, len);
current->text[current->lines-1][len]='\0';
if (!*p || *p=='\r' || *p=='\n') break;
while (*p++!=']');
}
}
return current;
}
subtitle *sub_read_line_third(FILE *fd,subtitle *current) {
char line[1001];
int a1,a2,a3,a4,b1,b2,b3,b4;
char *p=NULL;
int i,len;
bzero (current, sizeof(current));
while (!current->text[0]) {
if (!fgets (line, 1000, fd)) return NULL;
if ((len=sscanf (line, "%d:%d:%d,%d --> %d:%d:%d,%d",&a1,&a2,&a3,&a4,&b1,&b2,&b3,&b4)) < 8)
continue;
current->start = a1*360000+a2*6000+a3*100+a4/10;
current->end = b1*360000+b2*6000+b3*100+b4/10;
for (i=0; i<SUB_MAX_TEXT;) {
if (!fgets (line, 1000, fd)) break;
len=0;
for (p=line; *p!='\n' && *p!='\r' && *p; p++,len++);
if (len) {
current->text[i]=(char *)malloc (len+1);
if (!current->text[i]) return ERR;
strncpy (current->text[i], line, len); current->text[i][len]='\0';
i++;
} else {
break;
}
}
current->lines=i;
}
return current;
}
subtitle *sub_read_line_vplayer(FILE *fd,subtitle *current) {
char line[1001];
char line2[1001];
int a1,a2,a3,b1,b2,b3;
char *p=NULL, *next;
int i,len,len2,plen;
bzero (current, sizeof(current));
while (!current->text[0]) {
if (!fgets (line, 1000, fd)) return NULL;
if ((len=sscanf (line, "%d:%d:%d:%n",&a1,&a2,&a3,&plen)) < 3)
continue;
if (!fgets (line2, 1000, fd)) return NULL;
if ((len2=sscanf (line2, "%d:%d:%d:",&b1,&b2,&b3)) < 3)
continue;
// przewi<77> o linijk<6A> do ty<74>u:
fseek(fd,-strlen(line2),SEEK_CUR);
current->start = a1*360000+a2*6000+a3*100;
current->end = b1*360000+b2*6000+b3*100;
if ((current->end - current->start) > 1000) {current->end = current->start + 1000;} // not too long though.
// teraz czas na wkopiowanie stringu
p=line; p+=plen;i=0;
if (*p!='|') {
//
next = p,i=0;
while ((next =sub_readtext (next, &(current->text[i])))) {
if (current->text[i]==ERR) {return ERR;}
i++;
if (i>=SUB_MAX_TEXT) { printf ("Too many lines in a subtitle\n");current->lines=i;return current;}
}
current->lines=i+1;
}
}
return current;
}
subtitle *sub_read_line_rt(FILE *fd,subtitle *current) {
//TODO: This format uses quite rich (sub/super)set of xhtml
// I couldn't check it since DTD is not included.
// WARNING: full XML parses can be required for proper parsing
char line[1001];
int a1,a2,a3,a4,b1,b2,b3,b4;
char *p=NULL,*next=NULL;
int i,len,plen;
bzero (current, sizeof(current));
while (!current->text[0]) {
if (!fgets (line, 1000, fd)) return NULL;
//TODO: it seems that format of time is not easily determined, it may be 1:12, 1:12.0 or 0:1:12.0
//to describe the same moment in time. Maybe there are even more formats in use.
//if ((len=sscanf (line, "<Time Begin=\"%d:%d:%d.%d\" End=\"%d:%d:%d.%d\"",&a1,&a2,&a3,&a4,&b1,&b2,&b3,&b4)) < 8)
plen=a1=a2=a3=a4=b1=b2=b3=b4=0;
if (
((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d\" %*[Ee]nd=\"%d:%d\"%*[^<]<clear/>%n",&a2,&a3,&b2,&b3,&plen)) < 4) &&
((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d\" %*[Ee]nd=\"%d:%d.%d\"%*[^<]<clear/>%n",&a2,&a3,&b2,&b3,&b4,&plen)) < 5) &&
// ((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d.%d\" %*[Ee]nd=\"%d:%d\"%*[^<]<clear/>%n",&a2,&a3,&a4,&b2,&b3,&plen)) < 5) &&
((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d.%d\" %*[Ee]nd=\"%d:%d.%d\"%*[^<]<clear/>%n",&a2,&a3,&a4,&b2,&b3,&b4,&plen)) < 6) &&
((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d:%d.%d\" %*[Ee]nd=\"%d:%d:%d.%d\"%*[^<]<clear/>%n",&a1,&a2,&a3,&a4,&b1,&b2,&b3,&b4,&plen)) < 8)
)
continue;
current->start = a1*360000+a2*6000+a3*100+a4/10;
current->end = b1*360000+b2*6000+b3*100+b4/10;
p=line; p+=plen;i=0;
// TODO: I don't know what kind of convention is here for marking multiline subs, maybe <br/> like in xml?
next = strstr(line,"<clear/>")+8;i=0;
while ((next =sub_readtext (next, &(current->text[i])))) {
if (current->text[i]==ERR) {return ERR;}
i++;
if (i>=SUB_MAX_TEXT) { printf ("Too many lines in a subtitle\n");current->lines=i;return current;}
}
current->lines=i+1;
}
return current;
}
subtitle *sub_read_line_ssa(FILE *fd,subtitle *current) {
int hour1, min1, sec1, hunsec1,
hour2, min2, sec2, hunsec2, nothing;
char line[1000],
line2[1000];
do {
if (!fgets (line, 1000, fd)) return NULL;
} while (sscanf (line, "Dialogue: Marked=%d,%d:%d:%d.%d,%d:%d:%d.%d,"
"*Default,%d,%d,%d,%d,,%[^\n\r]", &nothing, &hour1, &min1,
&sec1, &hunsec1,
&hour2, &min2, &sec2, &hunsec2, &nothing,
&nothing, &nothing, &nothing, line2) < 14);
current->lines=1;
current->start = 360000*hour1 + 6000*min1 + 100*sec1 + hunsec1;
current->end = 360000*hour2 + 6000*min2 + 100*sec2 + hunsec2;
current->text[0]=(char *) malloc(strlen(line2)+1);
strcpy(current->text[0],line2);
return current;
}
subtitle *sub_read_line_dunnowhat(FILE *fd,subtitle *current) {
char line[1001];
char text[1001];
bzero (current, sizeof(current));
if (!fgets (line, 1000, fd))
return NULL;
if (sscanf (line, "%ld,%ld,\"%[^\"]", &(current->start),
&(current->end), text) <3)
return ERR;
current->text[0] = strdup(text);
current->lines = 1;
return current;
}
int sub_autodetect (FILE *fd) {
char line[1001];
int i,j=0;
// char *p;
while (j < 100) {
j++;
if (!fgets (line, 1000, fd))
return -1;
if (sscanf (line, "{%d}{%d}", &i, &i)==2)
{sub_uses_time=0;return 0;}
if (sscanf (line, "%d:%d:%d.%d,%d:%d:%d.%d", &i, &i, &i, &i, &i, &i, &i, &i)==8)
{sub_uses_time=1;return 1;}
if (sscanf (line, "%d:%d:%d,%d --> %d:%d:%d,%d", &i, &i, &i, &i, &i, &i, &i, &i)==8)
{sub_uses_time=1;return 2;}
if (strstr (line, "<SAMI>"))
{sub_uses_time=1; return 3;}
if (sscanf (line, "%d:%d:%d:", &i, &i, &i )==3)
{sub_uses_time=1;return 4;}
//TODO: just checking if first line of sub starts with "<" is WAY
// too weak test for RT
// Please someone who knows the format of RT... FIX IT!!!
// It may conflict with other sub formats in the future (actually it doesn't)
if ( *line == '<' )
{sub_uses_time=1;return 5;}
// I have only seen only 1 piece of .ssa file.
// It may be not correct (tell me if it's not)
if (!memcmp(line, "Dialogue: Marked", 16))
{sub_uses_time=1; return 6;}
if (sscanf (line, "%d,%d,\"%c", &i, &i, (char *) &i) == 3)
{sub_uses_time=0;return 7;}
}
return -1; // too many bad lines
}
subtitle* sub_read_file (char *filename) {
FILE *fd;
int n_max;
subtitle *first;
subtitle * (*func[])(FILE *fd,subtitle *dest)=
{
sub_read_line_microdvd,
sub_read_line_subrip,
sub_read_line_third,
sub_read_line_sami,
sub_read_line_vplayer,
sub_read_line_rt,
sub_read_line_ssa,
sub_read_line_dunnowhat
};
fd=fopen (filename, "r"); if (!fd) return NULL;
sub_format=sub_autodetect (fd);
if (sub_format==-1) {printf ("SUB: Could not determine file format\n");return NULL;}
printf ("SUB: Detected subtitle file format: %d\n",sub_format);
rewind (fd);
sub_num=0;n_max=32;
first=(subtitle *)malloc(n_max*sizeof(subtitle));
if(!first) return NULL;
while(1){
subtitle *sub;
if(sub_num>=n_max){
n_max+=16;
first=realloc(first,n_max*sizeof(subtitle));
}
sub=func[sub_format](fd,&first[sub_num]);
if(!sub) break; // EOF
if(sub==ERR) ++sub_errs; else ++sub_num; // Error vs. Valid
}
fclose(fd);
// printf ("SUB: Subtitle format %s time.\n", sub_uses_time?"uses":"doesn't use");
printf ("SUB: Read %i subtitles", sub_num);
if (sub_errs) printf (", %i bad line(s).\n", sub_errs);
else printf (".\n");
return first;
}
#if 0
char * strreplace( char * in,char * what,char * whereof )
{
int i;
char * tmp;
if ( ( in == NULL )||( what == NULL )||( whereof == NULL )||( ( tmp=strstr( in,what ) ) == NULL ) ) return NULL;
for( i=0;i<strlen( whereof );i++ ) tmp[i]=whereof[i];
if ( strlen( what ) > strlen( whereof ) ) tmp[i]=0;
return in;
}
#endif
char * sub_filename(char* path, char * fname )
{
char * sub_name1;
char * sub_name2;
char * aviptr1, * aviptr2, * tmp;
int i,j;
FILE * f;
int pos=0;
char * sub_exts[] =
{ ".sub",
".SUB",
".srt",
".SRT",
".smi",
".SMI",
".rt",
".RT",
".txt",
".TXT",
".ssa",
".SSA"};
if ( fname == NULL ) return NULL;
sub_name1=strrchr(fname,'.');
if (!sub_name1) return NULL;
pos=sub_name1-fname;
sub_name1=malloc(strlen(fname)+8);
strcpy(sub_name1,fname);
sub_name2=malloc (strlen(path) + strlen(fname) + 8);
if ((tmp=strrchr(fname,'/')))
sprintf (sub_name2, "%s%s", path, tmp+1);
else
sprintf (sub_name2, "%s%s", path, fname);
aviptr1=strrchr(sub_name1,'.');
aviptr2=strrchr(sub_name2,'.');
for(j=0;j<=1;j++){
char* sub_name=j?sub_name1:sub_name2;
for ( i=0;i<(sizeof(sub_exts)/sizeof(char*));i++ ) {
strcpy(j?aviptr1:aviptr2,sub_exts[i]);
// printf("trying: '%s'\n",sub_name);
if((f=fopen( sub_name,"rt" ))) {
fclose( f );
printf( "SUB: Detected sub file: %s\n",sub_name );
return sub_name;
}
}
}
return NULL;
}
#if 0
int main(int argc, char **argv) { // for testing
int i,j;
subtitle *subs;
subtitle *egysub;
if(argc<2){
printf("\nUsage: subreader filename.sub\n\n");
exit(1);
}
subs=sub_read_file(argv[1]);
if(!subs){
printf("Couldn't load file... let's write a bugreport :)\n");
exit(1);
}
for(j=0;j<sub_num;j++){
egysub=&subs[j];
printf ("%i line%c (%li-%li) ",
egysub->lines,
(1==egysub->lines)?' ':'s',
egysub->start,
egysub->end);
for (i=0; i<egysub->lines; i++) {
printf ("%s%s",egysub->text[i], i==egysub->lines-1?"":" <BREAK> ");
}
printf ("\n");
}
printf ("Subtitle format %s time.\n", sub_uses_time?"uses":"doesn't use");
printf ("Read %i subtitles, %i errors.\n", sub_num, sub_errs);
return 0;
}
#endif
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