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  1. /*
  2.  * Copyright (c) 2012 Clément Bœsch
  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.  * PJS (Phoenix Japanimation Society) subtitles format demuxer
  24.  *
  25.  * @see http://subs.com.ru/page.php?al=pjs
  26.  */
  27.  
  28. #include "avformat.h"
  29. #include "internal.h"
  30. #include "subtitles.h"
  31.  
  32. typedef struct {
  33.     FFDemuxSubtitlesQueue q;
  34. } PJSContext;
  35.  
  36. static int pjs_probe(AVProbeData *p)
  37. {
  38.     char c;
  39.     int64_t start, end;
  40.     const unsigned char *ptr = p->buf;
  41.  
  42.     if (sscanf(ptr, "%"SCNd64",%"SCNd64",%c", &start, &end, &c) == 3) {
  43.         size_t q1pos = strcspn(ptr, "\"");
  44.         size_t q2pos = q1pos + strcspn(ptr + q1pos + 1, "\"") + 1;
  45.         if (strcspn(ptr, "\r\n") > q2pos)
  46.             return AVPROBE_SCORE_MAX;
  47.     }
  48.     return 0;
  49. }
  50.  
  51. static int64_t read_ts(char **line, int *duration)
  52. {
  53.     int64_t start, end;
  54.  
  55.     if (sscanf(*line, "%"SCNd64",%"SCNd64, &start, &end) == 2) {
  56.         *line += strcspn(*line, "\"");
  57.         *line += !!**line;
  58.         *duration = end - start;
  59.         return start;
  60.     }
  61.     return AV_NOPTS_VALUE;
  62. }
  63.  
  64. static int pjs_read_header(AVFormatContext *s)
  65. {
  66.     PJSContext *pjs = s->priv_data;
  67.     AVStream *st = avformat_new_stream(s, NULL);
  68.     int res = 0;
  69.  
  70.     if (!st)
  71.         return AVERROR(ENOMEM);
  72.     avpriv_set_pts_info(st, 64, 1, 10);
  73.     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  74.     st->codec->codec_id   = AV_CODEC_ID_PJS;
  75.  
  76.     while (!avio_feof(s->pb)) {
  77.         char line[4096];
  78.         char *p = line;
  79.         const int64_t pos = avio_tell(s->pb);
  80.         int len = ff_get_line(s->pb, line, sizeof(line));
  81.         int64_t pts_start;
  82.         int duration;
  83.  
  84.         if (!len)
  85.             break;
  86.  
  87.         line[strcspn(line, "\r\n")] = 0;
  88.  
  89.         pts_start = read_ts(&p, &duration);
  90.         if (pts_start != AV_NOPTS_VALUE) {
  91.             AVPacket *sub;
  92.  
  93.             p[strcspn(p, "\"")] = 0;
  94.             sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
  95.             if (!sub)
  96.                 return AVERROR(ENOMEM);
  97.             sub->pos = pos;
  98.             sub->pts = pts_start;
  99.             sub->duration = duration;
  100.         }
  101.     }
  102.  
  103.     ff_subtitles_queue_finalize(&pjs->q);
  104.     return res;
  105. }
  106.  
  107. static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt)
  108. {
  109.     PJSContext *pjs = s->priv_data;
  110.     return ff_subtitles_queue_read_packet(&pjs->q, pkt);
  111. }
  112.  
  113. static int pjs_read_seek(AVFormatContext *s, int stream_index,
  114.                          int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
  115. {
  116.     PJSContext *pjs = s->priv_data;
  117.     return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
  118.                                    min_ts, ts, max_ts, flags);
  119. }
  120.  
  121. static int pjs_read_close(AVFormatContext *s)
  122. {
  123.     PJSContext *pjs = s->priv_data;
  124.     ff_subtitles_queue_clean(&pjs->q);
  125.     return 0;
  126. }
  127.  
  128. AVInputFormat ff_pjs_demuxer = {
  129.     .name           = "pjs",
  130.     .long_name      = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
  131.     .priv_data_size = sizeof(PJSContext),
  132.     .read_probe     = pjs_probe,
  133.     .read_header    = pjs_read_header,
  134.     .read_packet    = pjs_read_packet,
  135.     .read_seek2     = pjs_read_seek,
  136.     .read_close     = pjs_read_close,
  137.     .extensions     = "pjs",
  138. };
  139.