Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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, "\"") + 1;
  57.         *duration = end - start;
  58.         return start;
  59.     }
  60.     return AV_NOPTS_VALUE;
  61. }
  62.  
  63. static int pjs_read_header(AVFormatContext *s)
  64. {
  65.     PJSContext *pjs = s->priv_data;
  66.     AVStream *st = avformat_new_stream(s, NULL);
  67.     int res = 0;
  68.  
  69.     if (!st)
  70.         return AVERROR(ENOMEM);
  71.     avpriv_set_pts_info(st, 64, 1, 10);
  72.     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  73.     st->codec->codec_id   = AV_CODEC_ID_PJS;
  74.  
  75.     while (!url_feof(s->pb)) {
  76.         char line[4096];
  77.         char *p = line;
  78.         const int64_t pos = avio_tell(s->pb);
  79.         int len = ff_get_line(s->pb, line, sizeof(line));
  80.         int64_t pts_start;
  81.         int duration;
  82.  
  83.         if (!len)
  84.             break;
  85.  
  86.         line[strcspn(line, "\r\n")] = 0;
  87.  
  88.         pts_start = read_ts(&p, &duration);
  89.         if (pts_start != AV_NOPTS_VALUE) {
  90.             AVPacket *sub;
  91.  
  92.             p[strcspn(p, "\"")] = 0;
  93.             sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
  94.             if (!sub)
  95.                 return AVERROR(ENOMEM);
  96.             sub->pos = pos;
  97.             sub->pts = pts_start;
  98.             sub->duration = duration;
  99.         }
  100.     }
  101.  
  102.     ff_subtitles_queue_finalize(&pjs->q);
  103.     return res;
  104. }
  105.  
  106. static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt)
  107. {
  108.     PJSContext *pjs = s->priv_data;
  109.     return ff_subtitles_queue_read_packet(&pjs->q, pkt);
  110. }
  111.  
  112. static int pjs_read_seek(AVFormatContext *s, int stream_index,
  113.                          int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
  114. {
  115.     PJSContext *pjs = s->priv_data;
  116.     return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
  117.                                    min_ts, ts, max_ts, flags);
  118. }
  119.  
  120. static int pjs_read_close(AVFormatContext *s)
  121. {
  122.     PJSContext *pjs = s->priv_data;
  123.     ff_subtitles_queue_clean(&pjs->q);
  124.     return 0;
  125. }
  126.  
  127. AVInputFormat ff_pjs_demuxer = {
  128.     .name           = "pjs",
  129.     .long_name      = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
  130.     .priv_data_size = sizeof(PJSContext),
  131.     .read_probe     = pjs_probe,
  132.     .read_header    = pjs_read_header,
  133.     .read_packet    = pjs_read_packet,
  134.     .read_seek2     = pjs_read_seek,
  135.     .read_close     = pjs_read_close,
  136.     .extensions     = "pjs",
  137. };
  138.