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  1. /*
  2.  * Copyright (c) 2014 Eejya Singh
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. /**
  22.  * @file
  23.  * STL subtitles format demuxer
  24.  * @see https://documentation.apple.com/en/dvdstudiopro/usermanual/index.html#chapter=19%26section=13%26tasks=true
  25.  */
  26.  
  27. #include "avformat.h"
  28. #include "internal.h"
  29. #include "subtitles.h"
  30. #include "libavutil/intreadwrite.h"
  31. #include "libavutil/avstring.h"
  32.  
  33. typedef struct {
  34.     FFDemuxSubtitlesQueue q;
  35. } STLContext;
  36.  
  37. static int stl_probe(AVProbeData *p)
  38. {
  39.     char c;
  40.     const unsigned char *ptr = p->buf;
  41.  
  42.     if (AV_RB24(ptr) == 0xEFBBBF)
  43.         ptr += 3;  /* skip UTF-8 BOM */
  44.  
  45.     while (*ptr == '\r' || *ptr == '\n' || *ptr == '$' || !strncmp(ptr, "//" , 2))
  46.         ptr += ff_subtitles_next_line(ptr);
  47.  
  48.     if (sscanf(ptr, "%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d , %c", &c) == 1)
  49.         return AVPROBE_SCORE_MAX;
  50.  
  51.     return 0;
  52. }
  53.  
  54. static int64_t get_pts(char **buf, int *duration)
  55. {
  56.     int hh1, mm1, ss1, ms1;
  57.     int hh2, mm2, ss2, ms2;
  58.     int len = 0;
  59.  
  60.     if (sscanf(*buf, "%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , %n",
  61.                 &hh1, &mm1, &ss1, &ms1,
  62.                 &hh2, &mm2, &ss2, &ms2, &len) >= 8 && len > 0) {
  63.         int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
  64.         int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
  65.         *duration = end - start;
  66.         *buf += len;
  67.         return start;
  68.     }
  69.     return AV_NOPTS_VALUE;
  70. }
  71.  
  72. static int stl_read_header(AVFormatContext *s)
  73. {
  74.     STLContext *stl = s->priv_data;
  75.     AVStream *st = avformat_new_stream(s, NULL);
  76.  
  77.     if (!st)
  78.         return AVERROR(ENOMEM);
  79.     avpriv_set_pts_info(st, 64, 1, 100);
  80.     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  81.     st->codec->codec_id   = AV_CODEC_ID_STL;
  82.  
  83.     while (!avio_feof(s->pb)) {
  84.         char line[4096];
  85.         char *p = line;
  86.         const int64_t pos = avio_tell(s->pb);
  87.         int len = ff_get_line(s->pb, line, sizeof(line));
  88.         int64_t pts_start;
  89.         int duration;
  90.  
  91.         if (!len)
  92.             break;
  93.  
  94.         line[strcspn(line, "\r\n")] = 0;
  95.         pts_start = get_pts(&p , &duration);
  96.  
  97.         if (pts_start != AV_NOPTS_VALUE) {
  98.             AVPacket *sub;
  99.             sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0);
  100.             if (!sub)
  101.                 return AVERROR(ENOMEM);
  102.             sub->pos = pos;
  103.             sub->pts = pts_start;
  104.             sub->duration = duration;
  105.         }
  106.     }
  107.     ff_subtitles_queue_finalize(&stl->q);
  108.     return 0;
  109. }
  110. static int stl_read_packet(AVFormatContext *s, AVPacket *pkt)
  111. {
  112.     STLContext *stl = s->priv_data;
  113.     return ff_subtitles_queue_read_packet(&stl->q, pkt);
  114. }
  115.  
  116. static int stl_read_seek(AVFormatContext *s, int stream_index,
  117.                              int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
  118. {
  119.     STLContext *stl = s->priv_data;
  120.     return ff_subtitles_queue_seek(&stl->q, s, stream_index,
  121.                                    min_ts, ts, max_ts, flags);
  122. }
  123.  
  124. static int stl_read_close(AVFormatContext *s)
  125. {
  126.     STLContext *stl = s->priv_data;
  127.     ff_subtitles_queue_clean(&stl->q);
  128.     return 0;
  129. }
  130.  
  131. AVInputFormat ff_stl_demuxer = {
  132.     .name           = "stl",
  133.     .long_name      = NULL_IF_CONFIG_SMALL("Spruce subtitle format"),
  134.     .priv_data_size = sizeof(STLContext),
  135.     .read_probe     = stl_probe,
  136.     .read_header    = stl_read_header,
  137.     .read_packet    = stl_read_packet,
  138.     .read_seek2     = stl_read_seek,
  139.     .read_close     = stl_read_close,
  140.     .extensions     = "stl",
  141. };
  142.