mirror of https://github.com/mpv-player/mpv
373 lines
9.0 KiB
C
373 lines
9.0 KiB
C
/*
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* Subtitle reader with format autodetection
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*
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* Written by laaz
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* Some code cleanup & realloc() by A'rpi/ESP-team
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "subreader.h"
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#define ERR (void *)-1
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int sub_uses_time=0;
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int sub_errs=0;
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int sub_num=0; // number of subtitle structs
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int sub_format=-1; // 0 for microdvd
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// 1 for SubRip
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// 2 for the third format (what's this?)
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// 3 for SAMI (smi)
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int eol(char p) {
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return (p=='\r' || p=='\n' || p=='\0');
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}
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static inline void trail_space(char *s) {
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int i;
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while (isspace(*s)) strcpy(s, s + 1);
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i = strlen(s) - 1;
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while (i > 0 && isspace(s[i])) s[i--] = '\0';
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}
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subtitle *sub_read_line_sami(FILE *fd, subtitle *current) {
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static char line[1001];
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static char *s = NULL;
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char text[1000], *p, *q;
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int state;
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current->lines = current->start = current->end = 0;
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state = 0;
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/* read the first line */
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if (!s)
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if (!(s = fgets(line, 1000, fd))) return 0;
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do {
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switch (state) {
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case 0: /* find "START=" */
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s = strstr (s, "Start=");
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if (s) {
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current->start = strtol (s + 6, &s, 0) / 10;
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state = 1; continue;
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}
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break;
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case 1: /* find "<P" */
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if ((s = strstr (s, "<P"))) { s += 2; state = 2; continue; }
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break;
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case 2: /* find ">" */
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if ((s = strchr (s, '>'))) { s++; state = 3; p = text; continue; }
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break;
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case 3: /* get all text until '<' appears */
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if (*s == '\0') { break; }
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else if (*s == '<') { state = 4; }
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else if (!strncasecmp (s, " ", 6)) { *p++ = ' '; s += 6; }
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else if (*s == '\r') { s++; }
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else if (!strncasecmp (s, "<br>", 4) || *s == '\n') {
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*p = '\0'; p = text; trail_space (text);
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if (text[0] != '\0')
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current->text[current->lines++] = strdup (text);
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if (*s == '\n') s++; else s += 4;
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}
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else *p++ = *s++;
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continue;
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case 4: /* get current->end or skip <TAG> */
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q = strstr (s, "Start=");
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if (q) {
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current->end = strtol (q + 6, &q, 0) / 10 - 1;
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*p = '\0'; trail_space (text);
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if (text[0] != '\0')
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current->text[current->lines++] = strdup (text);
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if (current->lines > 0) { state = 99; break; }
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state = 0; continue;
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}
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s = strchr (s, '>');
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if (s) { s++; state = 3; continue; }
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break;
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}
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/* read next line */
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if (state != 99 && !(s = fgets (line, 1000, fd))) return 0;
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} while (state != 99);
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return current;
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}
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char *sub_readtext(char *source, char **dest) {
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int len=0;
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char *p;
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for (p=source;*p!='\r' && *p!='\n' && *p!='|'; p++,len++);
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*dest= (char *)malloc (len+1);
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if (!dest) {return ERR;}
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strncpy(*dest, source, len);
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(*dest)[len]=0;
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while (*p=='\r' || *p=='\n' || *p=='|') p++;
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if (*p) return p; // not-last text field
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else return NULL; // last text field
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}
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subtitle *sub_read_line_microdvd(FILE *fd,subtitle *current) {
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char line[1001];
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char line2[1001];
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char *p, *next;
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int i;
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bzero (current, sizeof(current));
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do {
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if (!fgets (line, 1000, fd)) return NULL;
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} while (*line=='\n' || *line == '\r' || !*line);
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if (sscanf (line, "{%ld}{%ld}%s", &(current->start), &(current->end),line2) <2) {return ERR;}
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p=line;
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while (*p++!='}');
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while (*p++!='}');
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next=p, i=0;
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while ((next =sub_readtext (next, &(current->text[i])))) {
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if (current->text[i]==ERR) {return ERR;}
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i++;
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if (i>=SUB_MAX_TEXT) { printf ("Too many lines in a subtitle\n");current->lines=i;return;}
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}
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current->lines=i+1;
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return current;
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}
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subtitle *sub_read_line_subrip(FILE *fd, subtitle *current) {
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char line[1001];
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int a1,a2,a3,a4,b1,b2,b3,b4;
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char *p=NULL, *q=NULL;
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int len;
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bzero (current, sizeof(current));
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while (!current->text[0]) {
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if (!fgets (line, 1000, fd)) return NULL;
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if (sscanf (line, "%d:%d:%d.%d,%d:%d:%d.%d",&a1,&a2,&a3,&a4,&b1,&b2,&b3,&b4) < 8) continue;
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current->start = a1*360000+a2*6000+a3*100+a4;
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current->end = b1*360000+b2*6000+b3*100+b4;
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if (!fgets (line, 1000, fd)) return NULL;
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p=q=line;
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for (current->lines=1; current->lines < SUB_MAX_TEXT; current->lines++) {
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for (q=p,len=0; *p && *p!='\r' && *p!='\n' && strncmp(p,"[br]",4); p++,len++);
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current->text[current->lines-1]=(char *)malloc (len+1);
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if (!current->text[current->lines-1]) return ERR;
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strncpy (current->text[current->lines-1], q, len);
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current->text[current->lines-1][len]='\0';
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if (!*p || *p=='\r' || *p=='\n') break;
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while (*p++!=']');
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}
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}
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return current;
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}
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subtitle *sub_read_line_third(FILE *fd,subtitle *current) {
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char line[1001];
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int a1,a2,a3,a4,b1,b2,b3,b4;
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char *p=NULL;
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int i,len;
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bzero (current, sizeof(current));
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while (!current->text[0]) {
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if (!fgets (line, 1000, fd)) return NULL;
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if ((len=sscanf (line, "%d:%d:%d,%d --> %d:%d:%d,%d",&a1,&a2,&a3,&a4,&b1,&b2,&b3,&b4)) < 8)
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continue;
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current->start = a1*360000+a2*6000+a3*100+a4/10;
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current->end = b1*360000+b2*6000+b3*100+b4/10;
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for (i=0; i<SUB_MAX_TEXT;) {
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if (!fgets (line, 1000, fd)) break;
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len=0;
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for (p=line; *p!='\n' && *p!='\r' && *p; p++,len++);
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if (len) {
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current->text[i]=(char *)malloc (len+1);
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if (!current->text[i]) return ERR;
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strncpy (current->text[i], line, len); current->text[i][len]='\0';
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i++;
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} else {
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break;
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}
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}
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current->lines=i;
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}
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return current;
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}
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int sub_autodetect (FILE *fd) {
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char line[1001];
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int i,j=0;
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// char *p;
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while (j < 100) {
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j++;
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if (!fgets (line, 1000, fd))
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return -1;
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if (sscanf (line, "{%d}{%d}", &i, &i)==2)
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{sub_uses_time=0;return 0;}
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if (sscanf (line, "%d:%d:%d.%d,%d:%d:%d.%d", &i, &i, &i, &i, &i, &i, &i, &i)==8)
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{sub_uses_time=1;return 1;}
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if (sscanf (line, "%d:%d:%d,%d --> %d:%d:%d,%d", &i, &i, &i, &i, &i, &i, &i, &i)==8)
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{sub_uses_time=1;return 2;}
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if (strstr (line, "<SAMI>"))
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{sub_uses_time=1; return 3;}
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}
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return -1; // too many bad lines
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}
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subtitle* sub_read_file (char *filename) {
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FILE *fd;
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int n_max;
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subtitle *first;
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subtitle * (*func[4])(FILE *fd,subtitle *dest)=
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{
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sub_read_line_microdvd,
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sub_read_line_subrip,
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sub_read_line_third,
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sub_read_line_sami
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};
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fd=fopen (filename, "r"); if (!fd) return NULL;
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sub_format=sub_autodetect (fd);
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if (sub_format==-1) {printf ("SUB: Could not determine file format\n");return NULL;}
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printf ("SUB: Detected subtitle file format: %d\n",sub_format);
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rewind (fd);
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sub_num=0;n_max=32;
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first=(subtitle *)malloc(n_max*sizeof(subtitle));
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if(!first) return NULL;
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while(1){
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subtitle *sub;
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if(sub_num>=n_max){
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n_max+=16;
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first=realloc(first,n_max*sizeof(subtitle));
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}
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sub=func[sub_format](fd,&first[sub_num]);
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if(!sub) break; // EOF
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if(sub==ERR) ++sub_errs; else ++sub_num; // Error vs. Valid
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}
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fclose(fd);
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// printf ("SUB: Subtitle format %s time.\n", sub_uses_time?"uses":"doesn't use");
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printf ("SUB: Read %i subtitles", sub_num);
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if (sub_errs) printf (", %i bad line(s).\n", sub_errs);
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else printf (".\n");
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return first;
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}
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char * strreplace( char * in,char * what,char * whereof )
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{
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int i;
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char * tmp;
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if ( ( in == NULL )||( what == NULL )||( whereof == NULL )||( ( tmp=strstr( in,what ) ) == NULL ) ) return NULL;
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for( i=0;i<strlen( whereof );i++ ) tmp[i]=whereof[i];
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if ( strlen( what ) > strlen( whereof ) ) tmp[i]=0;
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return in;
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}
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char * sub_filename( char * fname )
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{
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char * sub_name = NULL;
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char * sub_tmp = NULL;
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int i;
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#define SUB_EXTS 6
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char * sub_exts[SUB_EXTS] =
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{ ".sub",
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".SUB",
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".srt",
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".SRT",
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".smi",
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".SMI"};
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if ( fname == NULL ) return NULL;
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for( i=strlen( fname );i>0;i-- )
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if( fname[i] == '.' )
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{
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sub_tmp=(char *)&fname[i];
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break;
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}
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if ( i == 0 ) return NULL;
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sub_name=strdup( fname );
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for ( i=0;i<SUB_EXTS;i++ )
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{
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FILE * f;
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strcpy( sub_name,fname );
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f=fopen( strreplace( sub_name,sub_tmp,sub_exts[i] ),"rt" );
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if ( f != NULL )
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{
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fclose( f );
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printf( "SUB: Detected sub file: %s\n",sub_name );
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return sub_name;
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}
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}
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return NULL;
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}
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#if 0
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int main(int argc, char **argv) { // for testing
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int i,j;
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subtitle *subs;
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subtitle *egysub;
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if(argc<2){
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printf("\nUsage: subreader filename.sub\n\n");
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exit(1);
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}
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subs=sub_read_file(argv[1]);
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if(!subs){
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printf("Couldn't load file... let's write a bugreport :)\n");
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exit(1);
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}
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for(j=0;j<sub_num;j++){
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egysub=&subs[j];
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printf ("%i line%c (%i-%i) ",
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egysub->lines,
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(1==egysub->lines)?' ':'s',
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egysub->start,
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egysub->end);
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for (i=0; i<egysub->lines; i++) {
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printf ("%s%s",egysub->text[i], i==egysub->lines-1?"":" <BREAK> ");
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}
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printf ("\n");
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}
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printf ("Subtitle format %s time.\n", sub_uses_time?"uses":"doesn't use");
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printf ("Read %i subtitles, %i errors.\n", sub_num, sub_errs);
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return 0;
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}
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#endif
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