subreader: fix unsafe sscanf calls with "%["

[mplayer.git] / sub / subreader.c

/*
 * Subtitle reader with format autodetection
 *
 * Copyright (c) 2001 laaz
 * Some code cleanup & realloc() by A'rpi/ESP-team
 *
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <ctype.h>

#include "config.h"
#include "mp_msg.h"
#include "subreader.h"
#include "mpcommon.h"
#include "subassconvert.h"
#include "options.h"
#include "stream/stream.h"
#include "libavutil/common.h"
#include "libavutil/avstring.h"

#ifdef CONFIG_ENCA
#include <enca.h>
#endif

#define ERR ((void *) -1)

#ifdef CONFIG_ICONV
#include <iconv.h>
char *sub_cp=NULL;
#endif

int suboverlap_enabled = 1;

// Parameter struct for the format-specific readline functions
struct readline_args {
    int utf16;
    struct MPOpts *opts;
};

/* Maximal length of line of a subtitle */
#define LINE_LEN 1000
static float mpsub_position=0;
static float mpsub_multiplier=1.;
static int sub_slacktime = 20000; //20 sec

int sub_no_text_pp=0;   // 1 => do not apply text post-processing
                        // like {\...} elimination in SSA format.

int sub_match_fuzziness=0; // level of sub name matching fuzziness

/* Use the SUB_* constant defined in the header file */
int sub_format=SUB_INVALID;
/*
   Some subtitling formats, namely AQT and Subrip09, define the end of a
   subtitle as the beginning of the following. Since currently we read one
   subtitle at time, previous_sub_end is used to communicate the end of the
   previous subtitle from the code reading the next. The previous subtitle
   is then modified to have the correct end time.
 */
unsigned long previous_sub_end;

static int eol(char p) {
        return p=='\r' || p=='\n' || p=='\0';
}

/* Remove leading and trailing space */
static void trail_space(char *s) {
        int i = 0;
        while (isspace(s[i])) ++i;
        if (i) strcpy(s, s + i);
        i = strlen(s) - 1;
        while (i > 0 && isspace(s[i])) s[i--] = '\0';
}

static char *stristr(const char *haystack, const char *needle) {
    int len = 0;
    const char *p = haystack;

    if (!(haystack && needle)) return NULL;

    len=strlen(needle);
    while (*p != '\0') {
        if (strncasecmp(p, needle, len) == 0) return (char*)p;
        p++;
    }

    return NULL;
}

static void sami_add_line(subtitle *current, char *buffer, char **pos) {
    char *p = *pos;
    *p = 0;
    trail_space(buffer);
    if (*buffer && current->lines < SUB_MAX_TEXT)
        current->text[current->lines++] = strdup(buffer);
    *pos = buffer;
}

static subtitle *sub_read_line_sami(stream_t* st, subtitle *current,
                                    struct readline_args *args)
{
    int utf16 = args->utf16;
    static char line[LINE_LEN+1];
    static char *s = NULL, *slacktime_s;
    char text[LINE_LEN+1], *p=NULL, *q;
    int state;

    current->lines = current->start = current->end = 0;
    current->alignment = SUB_ALIGNMENT_BOTTOMCENTER;
    state = 0;

    /* read the first line */
    if (!s)
            if (!(s = stream_read_line(st, line, LINE_LEN, utf16))) return 0;

    do {
        switch (state) {

        case 0: /* find "START=" or "Slacktime:" */
            slacktime_s = stristr (s, "Slacktime:");
            if (slacktime_s)
                sub_slacktime = strtol (slacktime_s+10, NULL, 0) / 10;

            s = stristr (s, "Start=");
            if (s) {
                current->start = strtol (s + 6, &s, 0) / 10;
                /* eat '>' */
                for (; *s != '>' && *s != '\0'; s++);
                s++;
                state = 1; continue;
            }
            break;

        case 1: /* find (optional) "<P", skip other TAGs */
            for  (; *s == ' ' || *s == '\t'; s++); /* strip blanks, if any */
            if (*s == '\0') break;
            if (*s != '<') { state = 3; p = text; continue; } /* not a TAG */
            s++;
            if (*s == 'P' || *s == 'p') { s++; state = 2; continue; } /* found '<P' */
            for (; *s != '>' && *s != '\0'; s++); /* skip remains of non-<P> TAG */
            if (*s == '\0')
              break;
            s++;
            continue;

        case 2: /* find ">" */
            if ((s = strchr (s, '>'))) { s++; state = 3; p = text; continue; }
            break;

        case 3: /* get all text until '<' appears */
            if (p - text >= LINE_LEN)
                sami_add_line(current, text, &p);
            if (*s == '\0') break;
            else if (!strncasecmp (s, "<br>", 4)) {
                sami_add_line(current, text, &p);
                s += 4;
            }
            else if ((*s == '{') && !sub_no_text_pp) { state = 5; ++s; continue; }
            else if (*s == '<') { state = 4; }
            else if (!strncasecmp (s, "&nbsp;", 6)) { *p++ = ' '; s += 6; }
            else if (*s == '\t') { *p++ = ' '; s++; }
            else if (*s == '\r' || *s == '\n') { s++; }
            else *p++ = *s++;

            /* skip duplicated space */
            if (p > text + 2) if (*(p-1) == ' ' && *(p-2) == ' ') p--;

            continue;

        case 4: /* get current->end or skip <TAG> */
            q = stristr (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;
       case 5: /* get rid of {...} text, but read the alignment code */
            if ((*s == '\\') && (*(s + 1) == 'a') && !sub_no_text_pp) {
               if (stristr(s, "\\a1") != NULL) {
                   current->alignment = SUB_ALIGNMENT_BOTTOMLEFT;
                   s = s + 3;
               }
               if (stristr(s, "\\a2") != NULL) {
                   current->alignment = SUB_ALIGNMENT_BOTTOMCENTER;
                   s = s + 3;
               } else if (stristr(s, "\\a3") != NULL) {
                   current->alignment = SUB_ALIGNMENT_BOTTOMRIGHT;
                   s = s + 3;
               } else if ((stristr(s, "\\a4") != NULL) || (stristr(s, "\\a5") != NULL) || (stristr(s, "\\a8") != NULL)) {
                   current->alignment = SUB_ALIGNMENT_TOPLEFT;
                   s = s + 3;
               } else if (stristr(s, "\\a6") != NULL) {
                   current->alignment = SUB_ALIGNMENT_TOPCENTER;
                   s = s + 3;
               } else if (stristr(s, "\\a7") != NULL) {
                   current->alignment = SUB_ALIGNMENT_TOPRIGHT;
                   s = s + 3;
               } else if (stristr(s, "\\a9") != NULL) {
                   current->alignment = SUB_ALIGNMENT_MIDDLELEFT;
                   s = s + 3;
               } else if (stristr(s, "\\a10") != NULL) {
                   current->alignment = SUB_ALIGNMENT_MIDDLECENTER;
                   s = s + 4;
               } else if (stristr(s, "\\a11") != NULL) {
                   current->alignment = SUB_ALIGNMENT_MIDDLERIGHT;
                   s = s + 4;
               }
            }
            if (*s == '}') state = 3;
            ++s;
            continue;
        }

        /* read next line */
        if (state != 99 && !(s = stream_read_line (st, line, LINE_LEN, utf16))) {
            if (current->start > 0) {
                break; // if it is the last subtitle
            } else {
                return 0;
            }
        }

    } while (state != 99);

    // For the last subtitle
    if (current->end <= 0) {
        current->end = current->start + sub_slacktime;
        sami_add_line(current, text, &p);
    }

    return current;
}


static char *sub_readtext(char *source, char **dest) {
    int len=0;
    char *p=source;

//    printf("src=%p  dest=%p  \n",source,dest);

    while ( !eol(*p) && *p!= '|' ) {
        p++,len++;
    }

    *dest= 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
}

static subtitle *sub_read_line_microdvd(stream_t *st,subtitle *current,
                                        struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    char line2[LINE_LEN+1];
    char *p, *next;
    int i;

    do {
        if (!stream_read_line (st, line, LINE_LEN, utf16)) return NULL;
    } while ((sscanf (line,
                      "{%ld}{}%[^\r\n]",
                      &(current->start), line2) < 2) &&
             (sscanf (line,
                      "{%ld}{%ld}%[^\r\n]",
                      &(current->start), &(current->end), line2) < 3));

    if (args->opts->ass_enabled) {
        subassconvert_microdvd(line2, line, LINE_LEN + 1);
        p = line;
    } else
        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) { mp_msg(MSGT_SUBREADER,MSGL_WARN,"Too many lines in a subtitle\n");current->lines=i;return current;}
    }
    current->lines= ++i;

    return current;
}

static subtitle *sub_read_line_mpl2(stream_t *st,subtitle *current,
                                    struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    char line2[LINE_LEN+1];
    char *p, *next;
    int i;

    do {
        if (!stream_read_line (st, line, LINE_LEN, utf16)) return NULL;
    } while ((sscanf (line,
                      "[%ld][%ld]%[^\r\n]",
                      &(current->start), &(current->end), line2) < 3));
    current->start *= 10;
    current->end *= 10;
    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) { mp_msg(MSGT_SUBREADER,MSGL_WARN,"Too many lines in a subtitle\n");current->lines=i;return current;}
    }
    current->lines= ++i;

    return current;
}

static subtitle *sub_read_line_subrip(stream_t* st, subtitle *current,
                                    struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    int a1,a2,a3,a4,b1,b2,b3,b4;
    char *p=NULL, *q=NULL;
    int len;

    while (1) {
        if (!stream_read_line (st, line, LINE_LEN, utf16)) 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 (!stream_read_line (st, line, LINE_LEN, utf16)) 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' && *p!='|' && strncmp(p,"[br]",4); p++,len++);
            current->text[current->lines-1]=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;
            if (*p=='|') p++;
            else while (*p++!=']');
        }
        break;
    }
    return current;
}

static subtitle *sub_ass_read_line_subviewer(stream_t *st, subtitle *current,
                                             struct readline_args *args)
{
    int utf16 = args->utf16;
    int a1, a2, a3, a4, b1, b2, b3, b4, j = 0;

    while (!current->text[0]) {
        char line[LINE_LEN + 1], full_line[LINE_LEN + 1];
        int i;

        /* Parse SubRip header */
        if (!stream_read_line(st, line, LINE_LEN, utf16))
            return NULL;
        if (sscanf(line, "%d:%d:%d%*1[,.:]%d --> %d:%d:%d%*1[,.:]%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;

        /* Concat lines */
        full_line[0] = 0;
        for (i = 0; i < SUB_MAX_TEXT; i++) {
            int blank = 1, len = 0;
            char *p;

            if (!stream_read_line(st, line, LINE_LEN, utf16))
                break;

            for (p = line; *p != '\n' && *p != '\r' && *p; p++, len++)
                if (*p != ' ' && *p != '\t')
                    blank = 0;

            if (blank)
                break;

            *p = 0;

            if (!(j + 1 + len < sizeof(full_line) - 1))
                break;

            if (j != 0)
                full_line[j++] = '\n';
            strcpy(&full_line[j], line);
            j += len;
        }

        /* Use the ASS/SSA converter to transform the whole lines */
        if (full_line[0]) {
            char converted_line[LINE_LEN + 1];
            subassconvert_subrip(full_line, converted_line, LINE_LEN + 1);
            current->text[0] = strdup(converted_line);
            current->lines = 1;
        }
    }
    return current;
}

static subtitle *sub_read_line_subviewer(stream_t *st,subtitle *current,
                                         struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    int a1,a2,a3,a4,b1,b2,b3,b4;
    char *p=NULL;
    int i,len;

    if (args->opts->ass_enabled)
        return sub_ass_read_line_subviewer(st, current, args);
    while (!current->text[0]) {
        if (!stream_read_line (st, line, LINE_LEN, utf16)) return NULL;
        if ((len=sscanf (line, "%d:%d:%d%*1[,.:]%d --> %d:%d:%d%*1[,.:]%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;) {
            int blank = 1;
            if (!stream_read_line (st, line, LINE_LEN, utf16)) break;
            len=0;
            for (p=line; *p!='\n' && *p!='\r' && *p; p++,len++)
                if (*p != ' ' && *p != '\t')
                    blank = 0;
            if (len && !blank) {
                int j=0,skip=0;
                char *curptr=current->text[i]=malloc (len+1);
                if (!current->text[i]) return ERR;
                //strncpy (current->text[i], line, len); current->text[i][len]='\0';
                for(; j<len; j++) {
                    /* let's filter html tags ::atmos */
                    if(line[j]=='>') {
                        skip=0;
                        continue;
                    }
                    if(line[j]=='<') {
                        skip=1;
                        continue;
                    }
                    if(skip) {
                        continue;
                    }
                    *curptr=line[j];
                    curptr++;
                }
                *curptr='\0';

                i++;
            } else {
                break;
            }
        }
        current->lines=i;
    }
    return current;
}

static subtitle *sub_read_line_subviewer2(stream_t *st,subtitle *current,
                                          struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    int a1,a2,a3,a4;
    char *p=NULL;
    int i,len;

    while (!current->text[0]) {
        if (!stream_read_line (st, line, LINE_LEN, utf16)) return NULL;
        if (line[0]!='{')
            continue;
        if ((len=sscanf (line, "{T %d:%d:%d:%d",&a1,&a2,&a3,&a4)) < 4)
            continue;
        current->start = a1*360000+a2*6000+a3*100+a4/10;
        for (i=0; i<SUB_MAX_TEXT;) {
            if (!stream_read_line (st, line, LINE_LEN, utf16)) break;
            if (line[0]=='}') break;
            len=0;
            for (p=line; *p!='\n' && *p!='\r' && *p; ++p,++len);
            if (len) {
                current->text[i]=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;
}


static subtitle *sub_read_line_vplayer(stream_t *st,subtitle *current,
                                       struct readline_args *args)
{
        int utf16 = args->utf16;
        char line[LINE_LEN+1];
        int a1,a2,a3;
        char *p=NULL, *next,separator;
        int i,len,plen;

        while (!current->text[0]) {
                if (!stream_read_line (st, line, LINE_LEN, utf16)) return NULL;
                if ((len=sscanf (line, "%d:%d:%d%c%n",&a1,&a2,&a3,&separator,&plen)) < 4)
                        continue;

                if (!(current->start = a1*360000+a2*6000+a3*100))
                        continue;
                /* removed by wodzu
                p=line;
                // finds the body of the subtitle
                for (i=0; i<3; i++){
                   p=strchr(p,':');
                   if (p==NULL) break;
                   ++p;
                }
                if (p==NULL) {
                    printf("SUB: Skipping incorrect subtitle line!\n");
                    continue;
                }
                */
                // by wodzu: hey! this time we know what length it has! what is
                // that magic for? it can't deal with space instead of third
                // colon! look, what simple it can be:
                p = &line[ 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) { mp_msg(MSGT_SUBREADER,MSGL_WARN,"Too many lines in a subtitle\n");current->lines=i;return current;}
                        }
                        current->lines=i+1;
                }
        }
        return current;
}

static subtitle *sub_read_line_rt(stream_t *st,subtitle *current,
                                    struct readline_args *args)
{
    int utf16 = args->utf16;

        //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[LINE_LEN+1];
    int a1,a2,a3,a4,b1,b2,b3,b4;
    char *p=NULL,*next=NULL;
    int i,len,plen;

    while (!current->text[0]) {
        if (!stream_read_line (st, line, LINE_LEN, utf16)) 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",&a3,&a4,&b3,&b4,&plen)) < 4) &&
        ((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d.%d\" %*[Ee]nd=\"%d:%d.%d\"%*[^<]<clear/>%n",&a3,&a4,&b2,&b3,&b4,&plen)) < 5) &&
        ((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) &&
        //now try it without end time
        ((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d.%d\"%*[^<]<clear/>%n",&a3,&a4,&plen)) < 2) &&
        ((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d\"%*[^<]<clear/>%n",&a2,&a3,&plen)) < 2) &&
        ((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d.%d\"%*[^<]<clear/>%n",&a2,&a3,&a4,&plen)) < 3) &&
        ((len=sscanf (line, "<%*[tT]ime %*[bB]egin=\"%d:%d:%d.%d\"%*[^<]<clear/>%n",&a1,&a2,&a3,&a4,&plen)) < 4)
        )
            continue;
        current->start = a1*360000+a2*6000+a3*100+a4/10;
        current->end   = b1*360000+b2*6000+b3*100+b4/10;
        if (b1 == 0 && b2 == 0 && b3 == 0 && b4 == 0)
          current->end = current->start+200;
        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/>");
        if(next && strlen(next)>8){
          next+=8;i=0;
          while ((next =sub_readtext (next, &(current->text[i])))) {
                if (current->text[i]==ERR) {return ERR;}
                i++;
                if (i>=SUB_MAX_TEXT) { mp_msg(MSGT_SUBREADER,MSGL_WARN,"Too many lines in a subtitle\n");current->lines=i;return current;}
          }
        }
                        current->lines=i+1;
    }
    return current;
}

static subtitle *sub_read_line_ssa(stream_t *st,subtitle *current,
                                    struct readline_args *args)
{
    /* Instead of hardcoding the expected fields and their order on
     * each dialogue line, this code should parse the "Format: " line
     * which lists the fields used in the script. As is, this may not
     * work correctly with all scripts.
     */

        int utf16 = args->utf16;
        int comma;

        int hour1, min1, sec1, hunsec1,
            hour2, min2, sec2, hunsec2, nothing;
        int num;

        char line[LINE_LEN+1],
             line3[LINE_LEN+1],
             *line2;
        char *tmp;

        do {
                if (!stream_read_line (st, line, LINE_LEN, utf16)) return NULL;
        } while (sscanf (line, "Dialogue: Marked=%d,%d:%d:%d.%d,%d:%d:%d.%d"
                        "%[^\n\r]", &nothing,
                        &hour1, &min1, &sec1, &hunsec1,
                        &hour2, &min2, &sec2, &hunsec2,
                        line3) < 9
                 &&
                 sscanf (line, "Dialogue: %d,%d:%d:%d.%d,%d:%d:%d.%d"
                         "%[^\n\r]", &nothing,
                         &hour1, &min1, &sec1, &hunsec1,
                         &hour2, &min2, &sec2, &hunsec2,
                         line3) < 9         );

        line2=strchr(line3, ',');
        if (!line2) return NULL;

        for (comma = 3; comma < 9; comma ++)
            if (!(line2 = strchr(++line2, ',')))
                return NULL;
        line2++;

        current->lines=0;num=0;
        current->start = 360000*hour1 + 6000*min1 + 100*sec1 + hunsec1;
        current->end   = 360000*hour2 + 6000*min2 + 100*sec2 + hunsec2;

        while (((tmp=strstr(line2, "\\n")) != NULL) || ((tmp=strstr(line2, "\\N")) != NULL) ){
                current->text[num]=malloc(tmp-line2+1);
                strncpy (current->text[num], line2, tmp-line2);
                current->text[num][tmp-line2]='\0';
                line2=tmp+2;
                num++;
                current->lines++;
                if (current->lines >=  SUB_MAX_TEXT) return current;
        }

        current->text[num]=strdup(line2);
        current->lines++;

        return current;
}

static void sub_pp_ssa(subtitle *sub)
{
    for (int i = 0; i < sub->lines; i++) {
        char *s, *d;
        s = d = sub->text[i];
        while (1) {
            while (*s == '{')
                while (*s && *s++ != '}');
            if (!(*d++ = *s++))
                break;
        }
    }
}

/*
 * PJS subtitles reader.
 * That's the "Phoenix Japanimation Society" format.
 * I found some of them in http://www.scriptsclub.org/ (used for anime).
 * The time is in tenths of second.
 *
 * by set, based on code by szabi (dunnowhat sub format ;-)
 */
static subtitle *sub_read_line_pjs(stream_t *st,subtitle *current,
                                   struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    char text[LINE_LEN+1], *s, *d;

    if (!stream_read_line (st, line, LINE_LEN, utf16))
        return NULL;
    /* skip spaces */
    for (s=line; *s && isspace(*s); s++);
    /* allow empty lines at the end of the file */
    if (*s==0)
        return NULL;
    /* get the time */
    if (sscanf (s, "%ld,%ld,", &(current->start),
                &(current->end)) <2) {
        return ERR;
    }
    /* the files I have are in tenths of second */
    current->start *= 10;
    current->end *= 10;
    /* walk to the beggining of the string */
    for (; *s; s++) if (*s==',') break;
    if (*s) {
        for (s++; *s; s++) if (*s==',') break;
        if (*s) s++;
    }
    if (*s!='"') {
        return ERR;
    }
    /* copy the string to the text buffer */
    for (s++, d=text; *s && *s!='"'; s++, d++)
        *d=*s;
    *d=0;
    current->text[0] = strdup(text);
    current->lines = 1;

    return current;
}

static subtitle *sub_read_line_mpsub(stream_t *st, subtitle *current,
                                     struct readline_args *args)
{
        int utf16 = args->utf16;
        char line[LINE_LEN+1];
        float a,b;
        int num=0;
        char *p, *q;

        do
        {
                if (!stream_read_line(st, line, LINE_LEN, utf16)) return NULL;
        } while (sscanf (line, "%f %f", &a, &b) !=2);

        mpsub_position += a*mpsub_multiplier;
        current->start=(int) mpsub_position;
        mpsub_position += b*mpsub_multiplier;
        current->end=(int) mpsub_position;

        while (num < SUB_MAX_TEXT) {
                if (!stream_read_line (st, line, LINE_LEN, utf16)) {
                        if (num == 0) return NULL;
                        else return current;
                }
                p=line;
                while (isspace(*p)) p++;
                if (eol(*p) && num > 0) return current;
                if (eol(*p)) return NULL;

                for (q=p; !eol(*q); q++);
                *q='\0';
                if (strlen(p)) {
                        current->text[num]=strdup(p);
//                      printf (">%s<\n",p);
                        current->lines = ++num;
                } else {
                        if (num) return current;
                        else return NULL;
                }
        }
        return NULL; // we should have returned before if it's OK
}

static subtitle *sub_read_line_aqt(stream_t *st,subtitle *current,
                                   struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    char *next;
    int i;

    while (1) {
    // try to locate next subtitle
        if (!stream_read_line (st, line, LINE_LEN, utf16))
                return NULL;
        if (!(sscanf (line, "-->> %ld", &(current->start)) <1))
                break;
    }

    previous_sub_end = (current->start) ? current->start - 1 : 0;

    if (!stream_read_line (st, line, LINE_LEN, utf16))
        return NULL;

    sub_readtext((char *) &line,&current->text[0]);
    current->lines = 1;
    current->end = current->start; // will be corrected by next subtitle

    if (!stream_read_line (st, line, LINE_LEN, utf16))
        return current;

    next = line,i=1;
    while ((next =sub_readtext (next, &(current->text[i])))) {
        if (current->text[i]==ERR) {return ERR;}
        i++;
        if (i>=SUB_MAX_TEXT) { mp_msg(MSGT_SUBREADER,MSGL_WARN,"Too many lines in a subtitle\n");current->lines=i;return current;}
        }
    current->lines=i+1;

    if (!strlen(current->text[0]) && !strlen(current->text[1])) {
        previous_sub_end = 0;
        return NULL;
    }

    return current;
}

static subtitle *sub_read_line_subrip09(stream_t *st,subtitle *current,
                                    struct readline_args *args)
{
    int utf16 = args->utf16;
    char line[LINE_LEN+1];
    int a1,a2,a3;
    char * next=NULL;
    int i,len;

    while (1) {
    // try to locate next subtitle
        if (!stream_read_line (st, line, LINE_LEN, utf16))
                return NULL;
        if (!((len=sscanf (line, "[%d:%d:%d]",&a1,&a2,&a3)) < 3))
                break;
    }

    current->start = a1*360000+a2*6000+a3*100;

    previous_sub_end = (current->start) ? current->start - 1 : 0;

    if (!stream_read_line (st, line, LINE_LEN, utf16))
        return NULL;

    next = line,i=0;

    current->text[0]=""; // just to be sure that string is clear

    while ((next =sub_readtext (next, &(current->text[i])))) {
        if (current->text[i]==ERR) {return ERR;}
        i++;
        if (i>=SUB_MAX_TEXT) { mp_msg(MSGT_SUBREADER,MSGL_WARN,"Too many lines in a subtitle\n");current->lines=i;return current;}
        }
    current->lines=i+1;

    if (!strlen(current->text[0]) && (i==0)) {
        previous_sub_end = 0;
        return NULL;
    }

    return current;
}

static subtitle *sub_read_line_jacosub(stream_t* st, subtitle * current,
                                       struct readline_args *args)
{
    int utf16 = args->utf16;
    char line1[LINE_LEN], line2[LINE_LEN], directive[LINE_LEN], *p, *q;
    unsigned a1, a2, a3, a4, b1, b2, b3, b4, comment = 0;
    static unsigned jacoTimeres = 30;
    static int jacoShift = 0;

    memset(current, 0, sizeof(subtitle));
    memset(line1, 0, LINE_LEN);
    memset(line2, 0, LINE_LEN);
    memset(directive, 0, LINE_LEN);
    while (!current->text[0]) {
        if (!stream_read_line(st, line1, LINE_LEN, utf16)) {
            return NULL;
        }
        if (sscanf
            (line1, "%u:%u:%u.%u %u:%u:%u.%u %[^\n\r]", &a1, &a2, &a3, &a4,
             &b1, &b2, &b3, &b4, line2) < 9) {
            if (sscanf(line1, "@%u @%u %[^\n\r]", &a4, &b4, line2) < 3) {
                if (line1[0] == '#') {
                    int hours = 0, minutes = 0, seconds, delta, inverter =
                        1;
                    unsigned units = jacoShift;
                    switch (toupper(line1[1])) {
                    case 'S':
                        if (isalpha(line1[2])) {
                            delta = 6;
                        } else {
                            delta = 2;
                        }
                        if (sscanf(&line1[delta], "%d", &hours)) {
                            if (hours < 0) {
                                hours *= -1;
                                inverter = -1;
                            }
                            if (sscanf(&line1[delta], "%*d:%d", &minutes)) {
                                if (sscanf
                                    (&line1[delta], "%*d:%*d:%d",
                                     &seconds)) {
                                    sscanf(&line1[delta], "%*d:%*d:%*d.%d",
                                           &units);
                                } else {
                                    hours = 0;
                                    sscanf(&line1[delta], "%d:%d.%d",
                                           &minutes, &seconds, &units);
                                    minutes *= inverter;
                                }
                            } else {
                                hours = minutes = 0;
                                sscanf(&line1[delta], "%d.%d", &seconds,
                                       &units);
                                seconds *= inverter;
                            }
                            jacoShift =
                                ((hours * 3600 + minutes * 60 +
                                  seconds) * jacoTimeres +
                                 units) * inverter;
                        }
                        break;
                    case 'T':
                        if (isalpha(line1[2])) {
                            delta = 8;
                        } else {
                            delta = 2;
                        }
                        sscanf(&line1[delta], "%u", &jacoTimeres);
                        break;
                    }
                }
                continue;
            } else {
                current->start =
                    (unsigned long) ((a4 + jacoShift) * 100.0 /
                                     jacoTimeres);
                current->end =
                    (unsigned long) ((b4 + jacoShift) * 100.0 /
                                     jacoTimeres);
            }
        } else {
            current->start =
                (unsigned
                 long) (((a1 * 3600 + a2 * 60 + a3) * jacoTimeres + a4 +
                         jacoShift) * 100.0 / jacoTimeres);
            current->end =
                (unsigned
                 long) (((b1 * 3600 + b2 * 60 + b3) * jacoTimeres + b4 +
                         jacoShift) * 100.0 / jacoTimeres);
        }
        current->lines = 0;
        p = line2;
        while ((*p == ' ') || (*p == '\t')) {
            ++p;
        }
        if (isalpha(*p)||*p == '[') {
            int cont, jLength;

            if (sscanf(p, "%s %[^\n\r]", directive, line1) < 2)
                return (subtitle *) ERR;
            jLength = strlen(directive);
            for (cont = 0; cont < jLength; ++cont) {
                if (isalpha(*(directive + cont)))
                    *(directive + cont) = toupper(*(directive + cont));
            }
            if ((strstr(directive, "RDB") != NULL)
                || (strstr(directive, "RDC") != NULL)
                || (strstr(directive, "RLB") != NULL)
                || (strstr(directive, "RLG") != NULL)) {
                continue;
            }
            if (strstr(directive, "JL") != NULL) {
                current->alignment = SUB_ALIGNMENT_BOTTOMLEFT;
            } else if (strstr(directive, "JR") != NULL) {
                current->alignment = SUB_ALIGNMENT_BOTTOMRIGHT;
            } else {
                current->alignment = SUB_ALIGNMENT_BOTTOMCENTER;
            }
            strcpy(line2, line1);
            p = line2;
        }
        for (q = line1; (!eol(*p)) && (current->lines < SUB_MAX_TEXT); ++p) {
            switch (*p) {
            case '{':
                comment++;
                break;
            case '}':
                if (comment) {
                    --comment;
                    //the next line to get rid of a blank after the comment
                    if ((*(p + 1)) == ' ')
                        p++;
                }
                break;
            case '~':
                if (!comment) {
                    *q = ' ';
                    ++q;
                }
                break;
            case ' ':
            case '\t':
                if ((*(p + 1) == ' ') || (*(p + 1) == '\t'))
                    break;
                if (!comment) {
                    *q = ' ';
                    ++q;
                }
                break;
            case '\\':
                if (*(p + 1) == 'n') {
                    *q = '\0';
                    q = line1;
                    current->text[current->lines++] = strdup(line1);
                    ++p;
                    break;
                }
                if ((toupper(*(p + 1)) == 'C')
                    || (toupper(*(p + 1)) == 'F')) {
                    ++p,++p;
                    break;
                }
                if ((*(p + 1) == 'B') || (*(p + 1) == 'b') || (*(p + 1) == 'D') ||      //actually this means "insert current date here"
                    (*(p + 1) == 'I') || (*(p + 1) == 'i') || (*(p + 1) == 'N') || (*(p + 1) == 'T') || //actually this means "insert current time here"
                    (*(p + 1) == 'U') || (*(p + 1) == 'u')) {
                    ++p;
                    break;
                }
                if ((*(p + 1) == '\\') ||
                    (*(p + 1) == '~') || (*(p + 1) == '{')) {
                    ++p;
                } else if (eol(*(p + 1))) {
                    if (!stream_read_line(st, directive, LINE_LEN, utf16))
                        return NULL;
                    trail_space(directive);
                    av_strlcat(line2, directive, LINE_LEN);
                    break;
                }
            default:
                if (!comment) {
                    *q = *p;
                    ++q;
                }
            }                   //-- switch
        }                       //-- for
        *q = '\0';
        if (current->lines < SUB_MAX_TEXT)
            current->text[current->lines] = strdup(line1);
    }                           //-- while
    if (current->lines < SUB_MAX_TEXT)
        current->lines++;
    return current;
}

static int sub_autodetect (stream_t* st, int *uses_time, int utf16) {
    char line[LINE_LEN+1];
    int i,j=0;

    while (j < 100) {
        j++;
        if (!stream_read_line (st, line, LINE_LEN, utf16))
            return SUB_INVALID;

        if (sscanf (line, "{%d}{%d}", &i, &i)==2)
                {*uses_time=0;return SUB_MICRODVD;}
        if (sscanf (line, "{%d}{}", &i)==1)
                {*uses_time=0;return SUB_MICRODVD;}
        if (sscanf (line, "[%d][%d]", &i, &i)==2)
                {*uses_time=1;return SUB_MPL2;}
        if (sscanf (line, "%d:%d:%d.%d,%d:%d:%d.%d",     &i, &i, &i, &i, &i, &i, &i, &i)==8)
                {*uses_time=1;return SUB_SUBRIP;}
        if (sscanf (line, "%d:%d:%d%*1[,.:]%d --> %d:%d:%d%*1[,.:]%d", &i, &i, &i, &i, &i, &i, &i, &i) == 8)
                {*uses_time=1;return SUB_SUBVIEWER;}
        if (sscanf (line, "{T %d:%d:%d:%d",&i, &i, &i, &i)==4)
                {*uses_time=1;return SUB_SUBVIEWER2;}
        if (strstr (line, "<SAMI>"))
                {*uses_time=1; return SUB_SAMI;}
        if (sscanf(line, "%d:%d:%d.%d %d:%d:%d.%d", &i, &i, &i, &i, &i, &i, &i, &i) == 8)
                {*uses_time = 1; return SUB_JACOSUB;}
        if (sscanf(line, "@%d @%d", &i, &i) == 2)
                {*uses_time = 1; return SUB_JACOSUB;}
        if (sscanf (line, "%d:%d:%d:",     &i, &i, &i )==3)
                {*uses_time=1;return SUB_VPLAYER;}
        if (sscanf (line, "%d:%d:%d ",     &i, &i, &i )==3)
                {*uses_time=1;return SUB_VPLAYER;}
        if (!strncasecmp(line, "<window", 7))
                {*uses_time=1;return SUB_RT;}
        if (!memcmp(line, "Dialogue: Marked", 16))
                {*uses_time=1; return SUB_SSA;}
        if (!memcmp(line, "Dialogue: ", 10))
                {*uses_time=1; return SUB_SSA;}
        if (sscanf (line, "%d,%d,\"%c", &i, &i, (char *) &i) == 3)
                {*uses_time=1;return SUB_PJS;}
        if (sscanf (line, "FORMAT=%d", &i) == 1)
                {*uses_time=0; return SUB_MPSUB;}
        if (!memcmp(line, "FORMAT=TIME", 11))
                {*uses_time=1; return SUB_MPSUB;}
        if (strstr (line, "-->>"))
                {*uses_time=0; return SUB_AQTITLE;}
        if (sscanf (line, "[%d:%d:%d]", &i, &i, &i)==3)
                {*uses_time=1;return SUB_SUBRIP09;}
    }

    return SUB_INVALID;  // too many bad lines
}

extern float sub_delay;
extern float sub_fps;

#ifdef CONFIG_ICONV
static iconv_t icdsc = (iconv_t)(-1);

void    subcp_open (stream_t *st)
{
        char *tocp = "UTF-8";

        if (sub_cp){
                const char *cp_tmp = sub_cp;
#ifdef CONFIG_ENCA
                char enca_lang[3], enca_fallback[100];
                if (sscanf(sub_cp, "enca:%2s:%99s", enca_lang, enca_fallback) == 2
                     || sscanf(sub_cp, "ENCA:%2s:%99s", enca_lang, enca_fallback) == 2) {
                  if (st && st->flags & MP_STREAM_SEEK ) {
                    cp_tmp = guess_cp(st, enca_lang, enca_fallback);
                  } else {
                    cp_tmp = enca_fallback;
                    if (st)
                      mp_msg(MSGT_SUBREADER,MSGL_WARN,"SUB: enca failed, stream must be seekable.\n");
                  }
                }
#endif
                if ((icdsc = iconv_open (tocp, cp_tmp)) != (iconv_t)(-1)){
                        mp_msg(MSGT_SUBREADER,MSGL_V,"SUB: opened iconv descriptor.\n");
                } else
                        mp_msg(MSGT_SUBREADER,MSGL_ERR,"SUB: error opening iconv descriptor.\n");
        }
}

void    subcp_close (void)
{
        if (icdsc != (iconv_t)(-1)){
                (void) iconv_close (icdsc);
                icdsc = (iconv_t)(-1);
                mp_msg(MSGT_SUBREADER,MSGL_V,"SUB: closed iconv descriptor.\n");
        }
}

subtitle* subcp_recode (subtitle *sub)
{
        int l=sub->lines;
        size_t ileft, oleft;
        char *op, *ip, *ot;
        if(icdsc == (iconv_t)(-1)) return sub;

        while (l){
                ip = sub->text[--l];
                ileft = strlen(ip);
                oleft = 4 * ileft;

                if (!(ot = malloc(oleft + 1)))
                    abort();
                op = ot;
                if (iconv(icdsc, &ip, &ileft,
                          &op, &oleft) == (size_t)(-1)) {
                        mp_msg(MSGT_SUBREADER,MSGL_WARN,"SUB: error recoding line.\n");
                        free(ot);
                        continue;
                }
                // In some stateful encodings, we must clear the state to handle the last character
                if (iconv(icdsc, NULL, NULL,
                          &op, &oleft) == (size_t)(-1)) {
                        mp_msg(MSGT_SUBREADER,MSGL_WARN,"SUB: error recoding line, can't clear encoding state.\n");
                }
                *op='\0' ;
                free (sub->text[l]);
                sub->text[l] = ot;
        }
        return sub;
}
#endif

static void adjust_subs_time(subtitle* sub, float subtime, float fps, int block,
                             int sub_num, int sub_uses_time) {
        int n,m;
        subtitle* nextsub;
        int i = sub_num;
        unsigned long subfms = (sub_uses_time ? 100 : fps) * subtime;
        unsigned long overlap = (sub_uses_time ? 100 : fps) / 5; // 0.2s

        n=m=0;
        if (i)  for (;;){
                if (sub->end <= sub->start){
                        sub->end = sub->start + subfms;
                        m++;
                        n++;
                }
                if (!--i) break;
                nextsub = sub + 1;
            if(block){
                if ((sub->end > nextsub->start) && (sub->end <= nextsub->start + overlap)) {
                    // these subtitles overlap for less than 0.2 seconds
                    // and would result in very short overlapping subtitle
                    // so let's fix the problem here, before overlapping code
                    // get its hands on them
                    unsigned delta = sub->end - nextsub->start, half = delta / 2;
                    sub->end -= half + 1;
                    nextsub->start += delta - half;
                }
                if (sub->end >= nextsub->start){
                        sub->end = nextsub->start - 1;
                        if (sub->end - sub->start > subfms)
                                sub->end = sub->start + subfms;
                        if (!m)
                                n++;
                }
            }

                /* Theory:
                 * Movies are often converted from FILM (24 fps)
                 * to PAL (25) by simply speeding it up, so we
                 * to multiply the original timestmaps by
                 * (Movie's FPS / Subtitle's (guessed) FPS)
                 * so eg. for 23.98 fps movie and PAL time based
                 * subtitles we say -subfps 25 and we're fine!
                 */

                /* timed sub fps correction ::atmos */
                /* the frame-based case is handled in mpcommon.c
                 * where find_sub is called */
                if(sub_uses_time && sub_fps) {
                        sub->start *= sub_fps/fps;
                        sub->end   *= sub_fps/fps;
                }

                sub = nextsub;
                m = 0;
        }
        if (n) mp_msg(MSGT_SUBREADER,MSGL_V,"SUB: Adjusted %d subtitle(s).\n", n);
}

struct subreader {
    subtitle * (*read)(stream_t *st, subtitle *dest,
                       struct readline_args *args);
    void       (*post)(subtitle *dest);
    const char *name;
};

#ifdef CONFIG_ENCA
const char* guess_buffer_cp(unsigned char* buffer, int buflen, const char *preferred_language, const char *fallback)
{
    const char **languages;
    size_t langcnt;
    EncaAnalyser analyser;
    EncaEncoding encoding;
    const char *detected_sub_cp = NULL;
    int i;

    languages = enca_get_languages(&langcnt);
    mp_msg(MSGT_SUBREADER, MSGL_V, "ENCA supported languages: ");
    for (i = 0; i < langcnt; i++) {
        mp_msg(MSGT_SUBREADER, MSGL_V, "%s ", languages[i]);
    }
    mp_msg(MSGT_SUBREADER, MSGL_V, "\n");

    for (i = 0; i < langcnt; i++) {
        if (strcasecmp(languages[i], preferred_language) != 0) continue;
        analyser = enca_analyser_alloc(languages[i]);
        encoding = enca_analyse_const(analyser, buffer, buflen);
        enca_analyser_free(analyser);
        if (encoding.charset != ENCA_CS_UNKNOWN) {
            detected_sub_cp = enca_charset_name(encoding.charset, ENCA_NAME_STYLE_ICONV);
            break;
        }
    }

    free(languages);

    if (!detected_sub_cp) {
        detected_sub_cp = fallback;
        mp_msg(MSGT_SUBREADER, MSGL_INFO, "ENCA detection failed: fallback to %s\n", fallback);
    }else{
        mp_msg(MSGT_SUBREADER, MSGL_INFO, "ENCA detected charset: %s\n", detected_sub_cp);
    }

    return detected_sub_cp;
}

#define MAX_GUESS_BUFFER_SIZE (256*1024)
const char* guess_cp(stream_t *st, const char *preferred_language, const char *fallback)
{
    size_t buflen;
    unsigned char *buffer;
    const char *detected_sub_cp = NULL;

    buffer = malloc(MAX_GUESS_BUFFER_SIZE);
    buflen = stream_read(st,buffer, MAX_GUESS_BUFFER_SIZE);

    detected_sub_cp = guess_buffer_cp(buffer, buflen, preferred_language, fallback);

    free(buffer);
    stream_reset(st);
    stream_seek(st,0);

    return detected_sub_cp;
}
#undef MAX_GUESS_BUFFER_SIZE
#endif

sub_data* sub_read_file(char *filename, float fps, struct MPOpts *opts)
{
    int utf16;
    stream_t* fd;
    int n_max, n_first, i, j, sub_first, sub_orig;
    subtitle *first, *second, *sub, *return_sub, *alloced_sub = NULL;
    sub_data *subt_data;
    int uses_time = 0, sub_num = 0, sub_errs = 0;
    static const struct subreader sr[]=
    {
            { sub_read_line_microdvd, NULL, "microdvd" },
            { sub_read_line_subrip, NULL, "subrip" },
            { sub_read_line_subviewer, NULL, "subviewer" },
            { sub_read_line_sami, NULL, "sami" },
            { sub_read_line_vplayer, NULL, "vplayer" },
            { sub_read_line_rt, NULL, "rt" },
            { sub_read_line_ssa, sub_pp_ssa, "ssa" },
            { sub_read_line_pjs, NULL, "pjs" },
            { sub_read_line_mpsub, NULL, "mpsub" },
            { sub_read_line_aqt, NULL, "aqt" },
            { sub_read_line_subviewer2, NULL, "subviewer 2.0" },
            { sub_read_line_subrip09, NULL, "subrip 0.9" },
            { sub_read_line_jacosub, NULL, "jacosub" },
            { sub_read_line_mpl2, NULL, "mpl2" }
    };
    const struct subreader *srp;

    if(filename==NULL) return NULL; //qnx segfault
    fd=open_stream (filename, opts, NULL); if (!fd) return NULL;

    sub_format = SUB_INVALID;
    for (utf16 = 0; sub_format == SUB_INVALID && utf16 < 3; utf16++) {
        sub_format=sub_autodetect (fd, &uses_time, utf16);
        stream_reset(fd);
        stream_seek(fd,0);
    }
    utf16--;

    mpsub_multiplier = (uses_time ? 100.0 : 1.0);
    if (sub_format==SUB_INVALID) {mp_msg(MSGT_SUBREADER,MSGL_WARN,"SUB: Could not determine file format\n");return NULL;}
    srp=sr+sub_format;
    mp_msg(MSGT_SUBREADER, MSGL_V, "SUB: Detected subtitle file format: %s\n", srp->name);

#ifdef CONFIG_ICONV
    {
            int l,k;
            k = -1;
            if ((l=strlen(filename))>4){
                    char *exts[] = {".utf", ".utf8", ".utf-8" };
                    for (k=3;--k>=0;)
                        if (l >= strlen(exts[k]) && !strcasecmp(filename+(l - strlen(exts[k])), exts[k])){
                            break;
                        }
            }
            if (k<0) subcp_open(fd);
    }
#endif

    sub_num=0;n_max=32;
    first=malloc(n_max*sizeof(subtitle));
    if (!first)
        abort();

    alloced_sub =
    sub = malloc(sizeof(subtitle));
    //This is to deal with those formats (AQT & Subrip) which define the end of a subtitle
    //as the beginning of the following
    previous_sub_end = 0;
    while(1){
        if(sub_num>=n_max){
            n_max+=16;
            first=realloc(first,n_max*sizeof(subtitle));
        }
        memset(sub, '\0', sizeof(subtitle));
        sub=srp->read(fd, sub, &(struct readline_args){utf16, opts});
        if(!sub) break;   // EOF
#ifdef CONFIG_ICONV
        if (sub!=ERR) sub=subcp_recode(sub);
#endif
        if ( sub == ERR )
         {
#ifdef CONFIG_ICONV
          subcp_close();
#endif
          free(first);
          free(alloced_sub);
          return NULL;
         }
        // Apply any post processing that needs recoding first
        if ((sub!=ERR) && !sub_no_text_pp && srp->post) srp->post(sub);
        if(!sub_num || (first[sub_num - 1].start <= sub->start)){
            first[sub_num].start = sub->start;
            first[sub_num].end   = sub->end;
            first[sub_num].lines = sub->lines;
            first[sub_num].alignment = sub->alignment;
            for(i = 0; i < sub->lines; ++i){
                first[sub_num].text[i] = sub->text[i];
            }
            if (previous_sub_end){
                first[sub_num - 1].end = previous_sub_end;
                previous_sub_end = 0;
            }
        } else {
            for(j = sub_num - 1; j >= 0; --j){
                first[j + 1].start = first[j].start;
                first[j + 1].end   = first[j].end;
                first[j + 1].lines = first[j].lines;
                first[j + 1].alignment = first[j].alignment;
                for(i = 0; i < first[j].lines; ++i){
                    first[j + 1].text[i] = first[j].text[i];
                }
                if(!j || (first[j - 1].start <= sub->start)){
                    first[j].start = sub->start;
                    first[j].end   = sub->end;
                    first[j].lines = sub->lines;
                    first[j].alignment = sub->alignment;
                    for(i = 0; i < SUB_MAX_TEXT; ++i){
                        first[j].text[i] = sub->text[i];
                    }
                    if (previous_sub_end){
                        first[j].end = first[j - 1].end;
                        first[j - 1].end = previous_sub_end;
                        previous_sub_end = 0;
                    }
                    break;
                }
            }
        }
        if(sub==ERR) ++sub_errs; else ++sub_num; // Error vs. Valid
    }

    free_stream(fd);

#ifdef CONFIG_ICONV
    subcp_close();
#endif
    free(alloced_sub);

//    printf ("SUB: Subtitle format %s time.\n", uses_time?"uses":"doesn't use");
    mp_msg(MSGT_SUBREADER, MSGL_V,"SUB: Read %i subtitles, %i bad line(s).\n",
           sub_num, sub_errs);

    if(sub_num<=0){
        free(first);
        return NULL;
    }

    // we do overlap if the user forced it (suboverlap_enable == 2) or
    // the user didn't forced no-overlapsub and the format is Jacosub or Ssa.
    // this is because usually overlapping subtitles are found in these formats,
    // while in others they are probably result of bad timing
if ((suboverlap_enabled == 2) ||
    ((suboverlap_enabled) && ((sub_format == SUB_JACOSUB) || (sub_format == SUB_SSA)))) {
    adjust_subs_time(first, 6.0, fps, 0, sub_num, uses_time);/*~6 secs AST*/
// here we manage overlapping subtitles
    sub_orig = sub_num;
    n_first = sub_num;
    sub_num = 0;
    second = NULL;
    // for each subtitle in first[] we deal with its 'block' of
    // bonded subtitles
    for (sub_first = 0; sub_first < n_first; ++sub_first) {
        unsigned long global_start = first[sub_first].start,
                global_end = first[sub_first].end, local_start, local_end;
        int lines_to_add = first[sub_first].lines, sub_to_add = 0,
                **placeholder = NULL, higher_line = 0, counter, start_block_sub = sub_num;
        char real_block = 1;

        // here we find the number of subtitles inside the 'block'
        // and its span interval. this works well only with sorted
        // subtitles
        while ((sub_first + sub_to_add + 1 < n_first) && (first[sub_first + sub_to_add + 1].start < global_end)) {
            ++sub_to_add;
            lines_to_add += first[sub_first + sub_to_add].lines;
            if (first[sub_first + sub_to_add].start < global_start) {
                global_start = first[sub_first + sub_to_add].start;
            }
            if (first[sub_first + sub_to_add].end > global_end) {
                global_end = first[sub_first + sub_to_add].end;
            }
        }

        /* Avoid n^2 memory use for the "placeholder" data structure
         * below with subtitles that have a huge number of
         * consecutive overlapping lines. */
        lines_to_add = FFMIN(lines_to_add, SUB_MAX_TEXT);

        // we need a structure to keep trace of the screen lines
        // used by the subs, a 'placeholder'
        counter = 2 * sub_to_add + 1;  // the maximum number of subs derived
                                       // from a block of sub_to_add+1 subs
        placeholder = malloc(sizeof(int *) * counter);
        for (i = 0; i < counter; ++i) {
            placeholder[i] = malloc(sizeof(int) * lines_to_add);
            for (j = 0; j < lines_to_add; ++j) {
                placeholder[i][j] = -1;
            }
        }

        counter = 0;
        local_end = global_start - 1;
        do {
            int ls;

            // here we find the beginning and the end of a new
            // subtitle in the block
            local_start = local_end + 1;
            local_end   = global_end;
            for (j = 0; j <= sub_to_add; ++j) {
                if ((first[sub_first + j].start - 1 > local_start) && (first[sub_first + j].start - 1 < local_end)) {
                    local_end = first[sub_first + j].start - 1;
                } else if ((first[sub_first + j].end > local_start) && (first[sub_first + j].end < local_end)) {
                    local_end = first[sub_first + j].end;
                }
            }
            // here we allocate the screen lines to subs we must
            // display in current local_start-local_end interval.
            // if the subs were yet presents in the previous interval
            // they keep the same lines, otherside they get unused lines
            for (j = 0; j <= sub_to_add; ++j) {
                if ((first[sub_first + j].start <= local_end) && (first[sub_first + j].end > local_start)) {
                    unsigned long sub_lines = first[sub_first + j].lines, fragment_length = lines_to_add + 1,
                        tmp = 0;
                    char boolean = 0;
                    int fragment_position = -1;

                    // if this is not the first new sub of the block
                    // we find if this sub was present in the previous
                    // new sub
                    if (counter)
                        for (i = 0; i < lines_to_add; ++i) {
                            if (placeholder[counter - 1][i] == sub_first + j) {
                                placeholder[counter][i] = sub_first + j;
                                boolean = 1;
                            }
                        }
                    if (boolean)
                        continue;

                    // we are looking for the shortest among all groups of
                    // sequential blank lines whose length is greater than or
                    // equal to sub_lines. we store in fragment_position the
                    // position of the shortest group, in fragment_length its
                    // length, and in tmp the length of the group currently
                    // examinated
                    for (i = 0; i < lines_to_add; ++i) {
                        if (placeholder[counter][i] == -1) {
                            // placeholder[counter][i] is part of the current group
                            // of blank lines
                            ++tmp;
                        } else {
                            if (tmp == sub_lines) {
                                // current group's size fits exactly the one we
                                // need, so we stop looking
                                fragment_position = i - tmp;
                                tmp = 0;
                                break;
                            }
                            if ((tmp) && (tmp > sub_lines) && (tmp < fragment_length)) {
                                // current group is the best we found till here,
                                // but is still bigger than the one we are looking
                                // for, so we keep on looking
                                fragment_length = tmp;
                                fragment_position = i - tmp;
                                tmp = 0;
                            } else {
                                // current group doesn't fit at all, so we forget it
                                tmp = 0;
                            }
                        }
                    }
                    if (tmp) {
                        // last screen line is blank, a group ends with it
                        if ((tmp >= sub_lines) && (tmp < fragment_length)) {
                            fragment_position = i - tmp;
                        }
                    }
                    if (fragment_position == -1) {
                        // it was not possible to find free screen line(s) for a subtitle,
                        // usually this means a bug in the code; however we do not overlap
                        mp_msg(MSGT_SUBREADER, MSGL_WARN, "SUB: we could not find a suitable position for an overlapping subtitle\n");
                        higher_line = SUB_MAX_TEXT + 1;
                        break;
                    } else {
                        for (tmp = 0; tmp < sub_lines; ++tmp) {
                            placeholder[counter][fragment_position + tmp] = sub_first + j;
                        }
                    }
                }
            }
            for (j = higher_line + 1; j < lines_to_add; ++j) {
                if (placeholder[counter][j] != -1)
                    higher_line = j;
                else
                    break;
            }
            if (higher_line >= SUB_MAX_TEXT) {
                // the 'block' has too much lines, so we don't overlap the
                // subtitles
                second = realloc(second, (sub_num + sub_to_add + 1) * sizeof(subtitle));
                for (j = 0; j <= sub_to_add; ++j) {
                    int ls;
                    memset(&second[sub_num + j], '\0', sizeof(subtitle));
                    second[sub_num + j].start = first[sub_first + j].start;
                    second[sub_num + j].end   = first[sub_first + j].end;
                    second[sub_num + j].lines = first[sub_first + j].lines;
                    second[sub_num + j].alignment = first[sub_first + j].alignment;
                    for (ls = 0; ls < second[sub_num + j].lines; ls++) {
                        second[sub_num + j].text[ls] = strdup(first[sub_first + j].text[ls]);
                    }
                }
                sub_num += sub_to_add + 1;
                sub_first += sub_to_add;
                real_block = 0;
                break;
            }

            // we read the placeholder structure and create the new
            // subs.
            second = realloc(second, (sub_num + 1) * sizeof(subtitle));
            memset(&second[sub_num], '\0', sizeof(subtitle));
            second[sub_num].start = local_start;
            second[sub_num].end   = local_end;
            second[sub_num].alignment = first[sub_first].alignment;
            n_max = (lines_to_add < SUB_MAX_TEXT) ? lines_to_add : SUB_MAX_TEXT;
            for (i = 0, j = 0; j < n_max; ++j) {
                if (placeholder[counter][j] != -1) {
                    int lines = first[placeholder[counter][j]].lines;
                    for (ls = 0; ls < lines; ++ls) {
                        second[sub_num].text[i++] = strdup(first[placeholder[counter][j]].text[ls]);
                    }
                    j += lines - 1;
                } else {
                    second[sub_num].text[i++] = strdup(" ");
                }
            }
            ++sub_num;
            ++counter;
        } while (local_end < global_end);
        if (real_block)
            for (i = 0; i < counter; ++i)
                second[start_block_sub + i].lines = higher_line + 1;

        counter = 2 * sub_to_add + 1;
        for (i = 0; i < counter; ++i) {
            free(placeholder[i]);
        }
        free(placeholder);
        sub_first += sub_to_add;
    }

    for (j = sub_orig - 1; j >= 0; --j) {
        for (i = first[j].lines - 1; i >= 0; --i) {
            free(first[j].text[i]);
        }
    }
    free(first);

    return_sub = second;
} else { //if(suboverlap_enabled)
    adjust_subs_time(first, 6.0, fps, 1, sub_num, uses_time);/*~6 secs AST*/
    return_sub = first;
}
    if (return_sub == NULL) return NULL;
    subt_data = malloc(sizeof(sub_data));
    subt_data->filename = strdup(filename);
    subt_data->sub_uses_time = uses_time;
    subt_data->sub_num = sub_num;
    subt_data->sub_errs = sub_errs;
    subt_data->subtitles = return_sub;
    return subt_data;
}

void list_sub_file(sub_data* subd){
    int i,j;
    subtitle *subs = subd->subtitles;

    for(j=0; j < subd->sub_num; j++){
        subtitle* egysub=&subs[j];
        mp_msg(MSGT_SUBREADER,MSGL_INFO,"%i line%c (%li-%li)\n",
                    egysub->lines,
                    (1==egysub->lines)?' ':'s',
                    egysub->start,
                    egysub->end);
        for (i=0; i<egysub->lines; i++) {
            mp_msg(MSGT_SUBREADER,MSGL_INFO,"\t\t%d: %s%s", i,egysub->text[i], i==egysub->lines-1?"":" \n ");
        }
        mp_msg(MSGT_SUBREADER,MSGL_INFO,"\n");
    }

    mp_msg(MSGT_SUBREADER,MSGL_INFO,"Subtitle format %s time.\n",
                                  subd->sub_uses_time ? "uses":"doesn't use");
    mp_msg(MSGT_SUBREADER,MSGL_INFO,"Read %i subtitles, %i errors.\n", subd->sub_num, subd->sub_errs);
}

void dump_srt(sub_data* subd, float fps){
    int i,j;
    int h,m,s,ms;
    FILE * fd;
    subtitle * onesub;
    unsigned long temp;
    subtitle *subs = subd->subtitles;

    if (!subd->sub_uses_time && sub_fps == 0)
        sub_fps = fps;
    fd=fopen("dumpsub.srt","w");
    if(!fd)
    {
        perror("dump_srt: fopen");
        return;
    }
    for(i=0; i < subd->sub_num; i++)
    {
        onesub=subs+i;    //=&subs[i];
        fprintf(fd,"%d\n",i+1);//line number

        temp=onesub->start;
        if (!subd->sub_uses_time)
            temp = temp * 100 / sub_fps;
        temp -= sub_delay * 100;
        h=temp/360000;temp%=360000;     //h =1*100*60*60
        m=temp/6000;  temp%=6000;       //m =1*100*60
        s=temp/100;   temp%=100;        //s =1*100
        ms=temp*10;                     //ms=1*10
        fprintf(fd,"%02d:%02d:%02d,%03d --> ",h,m,s,ms);

        temp=onesub->end;
        if (!subd->sub_uses_time)
            temp = temp * 100 / sub_fps;
        temp -= sub_delay * 100;
        h=temp/360000;temp%=360000;
        m=temp/6000;  temp%=6000;
        s=temp/100;   temp%=100;
        ms=temp*10;
        fprintf(fd,"%02d:%02d:%02d,%03d\n",h,m,s,ms);

        for(j=0;j<onesub->lines;j++)
            fprintf(fd,"%s\n",onesub->text[j]);

        fprintf(fd,"\n");
    }
    fclose(fd);
    mp_msg(MSGT_SUBREADER,MSGL_INFO,"SUB: Subtitles dumped in \'dumpsub.srt\'.\n");
}

void dump_mpsub(sub_data* subd, float fps){
        int i,j;
        FILE *fd;
        float a,b;
        subtitle *subs = subd->subtitles;

        mpsub_position = subd->sub_uses_time? (sub_delay*100) : (sub_delay*fps);
        if (sub_fps==0) sub_fps=fps;

        fd=fopen ("dump.mpsub", "w");
        if (!fd) {
                perror ("dump_mpsub: fopen");
                return;
        }


        if (subd->sub_uses_time) fprintf (fd,"FORMAT=TIME\n\n");
        else fprintf (fd, "FORMAT=%5.2f\n\n", fps);

        for(j=0; j < subd->sub_num; j++){
                subtitle* egysub=&subs[j];
                if (subd->sub_uses_time) {
                        a=((egysub->start-mpsub_position)/100.0);
                        b=((egysub->end-egysub->start)/100.0);
                        if ( (float)((int)a) == a)
                        fprintf (fd, "%.0f",a);
                        else
                        fprintf (fd, "%.2f",a);

                        if ( (float)((int)b) == b)
                        fprintf (fd, " %.0f\n",b);
                        else
                        fprintf (fd, " %.2f\n",b);
                } else {
                        fprintf (fd, "%ld %ld\n", (long)((egysub->start*(fps/sub_fps))-((mpsub_position*(fps/sub_fps)))),
                                        (long)(((egysub->end)-(egysub->start))*(fps/sub_fps)));
                }

                mpsub_position = egysub->end;
                for (i=0; i<egysub->lines; i++) {
                        fprintf (fd, "%s\n",egysub->text[i]);
                }
                fprintf (fd, "\n");
        }
        fclose (fd);
        mp_msg(MSGT_SUBREADER,MSGL_INFO,"SUB: Subtitles dumped in \'dump.mpsub\'.\n");
}

void dump_microdvd(sub_data* subd, float fps) {
    int i, delay;
    FILE *fd;
    subtitle *subs = subd->subtitles;
    if (sub_fps == 0)
        sub_fps = fps;
    fd = fopen("dumpsub.sub", "w");
    if (!fd) {
        perror("dumpsub.sub: fopen");
        return;
    }
    delay = sub_delay * sub_fps;
    for (i = 0; i < subd->sub_num; ++i) {
        int j, start, end;
        start = subs[i].start;
        end = subs[i].end;
        if (subd->sub_uses_time) {
            start = start * sub_fps / 100 ;
            end = end * sub_fps / 100;
        }
        else {
            start = start * sub_fps / fps;
            end = end * sub_fps / fps;
        }
        start -= delay;
        end -= delay;
        fprintf(fd, "{%d}{%d}", start, end);
        for (j = 0; j < subs[i].lines; ++j)
            fprintf(fd, "%s%s", j ? "|" : "", subs[i].text[j]);
        fprintf(fd, "\n");
    }
    fclose(fd);
    mp_msg(MSGT_SUBREADER,MSGL_INFO,"SUB: Subtitles dumped in \'dumpsub.sub\'.\n");
}

void dump_jacosub(sub_data* subd, float fps) {
    int i,j;
    int h,m,s,cs;
    FILE * fd;
    subtitle * onesub;
    unsigned long temp;
    subtitle *subs = subd->subtitles;

    if (!subd->sub_uses_time && sub_fps == 0)
        sub_fps = fps;
    fd=fopen("dumpsub.jss","w");
    if(!fd)
    {
        perror("dump_jacosub: fopen");
        return;
    }
    fprintf(fd, "#TIMERES %d\n", (subd->sub_uses_time) ? 100 : (int)sub_fps);
    for(i=0; i < subd->sub_num; i++)
    {
        onesub=subs+i;    //=&subs[i];

        temp=onesub->start;
        if (!subd->sub_uses_time)
            temp = temp * 100 / sub_fps;
        temp -= sub_delay * 100;
        h=temp/360000;temp%=360000;     //h =1*100*60*60
        m=temp/6000;  temp%=6000;       //m =1*100*60
        s=temp/100;   temp%=100;        //s =1*100
        cs=temp;                        //cs=1*10
        fprintf(fd,"%02d:%02d:%02d.%02d ",h,m,s,cs);

        temp=onesub->end;
        if (!subd->sub_uses_time)
            temp = temp * 100 / sub_fps;
        temp -= sub_delay * 100;
        h=temp/360000;temp%=360000;
        m=temp/6000;  temp%=6000;
        s=temp/100;   temp%=100;
        cs=temp;
        fprintf(fd,"%02d:%02d:%02d.%02d {~} ",h,m,s,cs);

        for(j=0;j<onesub->lines;j++)
            fprintf(fd,"%s%s",j ? "\\n" : "", onesub->text[j]);

        fprintf(fd,"\n");
    }
    fclose(fd);
    mp_msg(MSGT_SUBREADER,MSGL_INFO,"SUB: Subtitles dumped in \'dumpsub.js\'.\n");
}

void dump_sami(sub_data* subd, float fps) {
    int i,j;
    FILE * fd;
    subtitle * onesub;
    unsigned long temp;
    subtitle *subs = subd->subtitles;

    if (!subd->sub_uses_time && sub_fps == 0)
        sub_fps = fps;
    fd=fopen("dumpsub.smi","w");
    if(!fd)
    {
        perror("dump_jacosub: fopen");
        return;
    }
    fprintf(fd, "<SAMI>\n"
                "<HEAD>\n"
                "       <STYLE TYPE=\"Text/css\">\n"
                "       <!--\n"
                "         P {margin-left: 29pt; margin-right: 29pt; font-size: 24pt; text-align: center; font-family: Tahoma; font-weight: bold; color: #FCDD03; background-color: #000000;}\n"
                "         .SUBTTL {Name: 'Subtitles'; Lang: en-US; SAMIType: CC;}\n"
                "       -->\n"
                "       </STYLE>\n"
                "</HEAD>\n"
                "<BODY>\n");
    for(i=0; i < subd->sub_num; i++)
    {
        onesub=subs+i;    //=&subs[i];

        temp=onesub->start;
        if (!subd->sub_uses_time)
            temp = temp * 100 / sub_fps;
        temp -= sub_delay * 100;
        fprintf(fd,"\t<SYNC Start=%lu>\n"
                    "\t  <P>", temp * 10);

        for(j=0;j<onesub->lines;j++)
            fprintf(fd,"%s%s",j ? "<br>" : "", onesub->text[j]);

        fprintf(fd,"\n");

        temp=onesub->end;
        if (!subd->sub_uses_time)
            temp = temp * 100 / sub_fps;
        temp -= sub_delay * 100;
        fprintf(fd,"\t<SYNC Start=%lu>\n"
                    "\t  <P>&nbsp;\n", temp * 10);
    }
    fprintf(fd, "</BODY>\n"
                "</SAMI>\n");
    fclose(fd);
    mp_msg(MSGT_SUBREADER,MSGL_INFO,"SUB: Subtitles dumped in \'dumpsub.smi\'.\n");
}

void sub_free( sub_data * subd )
{
    int i, j;

    if ( !subd ) return;

    for (i = 0; i < subd->sub_num; i++)
        for (j = 0; j < subd->subtitles[i].lines; j++)
            free( subd->subtitles[i].text[j] );
    free( subd->subtitles );
    free( subd->filename );
    free( subd );
}

#define MAX_SUBLINE 512
/**
 * \brief parse text and append it to subtitle in sub
 * \param sub subtitle struct to add text to
 * \param txt text to parse
 * \param len length of text in txt
 * \param endpts pts at which this subtitle text should be removed again
 *
 * <> and {} are interpreted as comment delimiters, "\n", "\N", '\n', '\r'
 * and '\0' are interpreted as newlines, duplicate, leading and trailing
 * newlines are ignored.
 */
void sub_add_text(subtitle *sub, const char *txt, int len, double endpts) {
  int comment = 0;
  int double_newline = 1; // ignore newlines at the beginning
  int i, pos;
  char *buf;
  if (sub->lines >= SUB_MAX_TEXT) return;
  pos = 0;
  buf = malloc(MAX_SUBLINE + 1);
  sub->text[sub->lines] = buf;
  sub->endpts[sub->lines] = endpts;
  for (i = 0; i < len && pos < MAX_SUBLINE; i++) {
    char c = txt[i];
    if (c == '<') comment |= 1;
    if (c == '{') comment |= 2;
    if (comment) {
      if (c == '}') comment &= ~2;
      if (c == '>') comment &= ~1;
      continue;
    }
    if (pos == MAX_SUBLINE - 1) {
      i--;
      c = 0;
    }
    if (c == '\\' && i + 1 < len) {
      c = txt[++i];
      if (c == 'n' || c == 'N') c = 0;
    }
    if (c == '\n' || c == '\r') c = 0;
    if (c) {
      double_newline = 0;
      buf[pos++] = c;
    } else if (!double_newline) {
      if (sub->lines >= SUB_MAX_TEXT - 1) {
        mp_msg(MSGT_VO, MSGL_WARN, "Too many subtitle lines\n");
        break;
      }
      double_newline = 1;
      buf[pos] = 0;
      sub->lines++;
      pos = 0;
      buf = malloc(MAX_SUBLINE + 1);
      sub->text[sub->lines] = buf;
      sub->endpts[sub->lines] = endpts;
    }
  }
  buf[pos] = 0;
  if (sub->lines < SUB_MAX_TEXT &&
      strlen(sub->text[sub->lines]))
    sub->lines++;
}

/**
 * \brief remove outdated subtitle lines.
 * \param sub subtitle struct to modify
 * \param pts current pts. All lines with endpts <= this will be removed.
 *            Use MP_NOPTS_VALUE to remove all lines
 * \return 1 if sub was modified, 0 otherwise.
 */
int sub_clear_text(subtitle *sub, double pts) {
  int i = 0;
  int changed = 0;
  while (i < sub->lines) {
    double endpts = sub->endpts[i];
    if (pts == MP_NOPTS_VALUE || (endpts != MP_NOPTS_VALUE && pts >= endpts)) {
      int j;
      free(sub->text[i]);
      for (j = i + 1; j < sub->lines; j++) {
        sub->text[j - 1] = sub->text[j];
        sub->endpts[j - 1] = sub->endpts[j];
      }
      sub->lines--;
      changed = 1;
    } else
      i++;
  }
  return changed;
}