libavformat/vplayerdec.c

   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  * VPlayer subtitles format demuxer
  24  */
  25
  26 #include "avformat.h"
  27 #include "internal.h"
  28 #include "subtitles.h"
  29
  30 typedef struct {
  31     FFDemuxSubtitlesQueue q;
  32 } VPlayerContext;
  33
  34 static int vplayer_probe(const AVProbeData *p)
  35 {
  36     char c;
  37     const unsigned char *ptr = p->buf;
  38
  39     if ((sscanf(ptr, "%*3d:%*2d:%*2d.%*2d%c", &c) == 1 ||
  40          sscanf(ptr, "%*3d:%*2d:%*2d%c",      &c) == 1) && strchr(": =", c))
  41         return AVPROBE_SCORE_MAX;
  42     return 0;
  43 }
  44
  45 static int64_t read_ts(char **line)
  46 {
  47     char c;
  48     int hh, mm, ss, ms, n, len;
  49
  50     if (((n = sscanf(*line, "%d:%d:%d.%d%c%n", &hh, &mm, &ss, &ms, &c, &len)) >= 5 ||
  51          (n = sscanf(*line, "%d:%d:%d%c%n",    &hh, &mm, &ss,      &c, &len)) >= 4) && strchr(": =", c)) {
  52         *line += len;
  53         return (hh*3600LL + mm*60LL + ss) * 100LL + (n < 5 ? 0 : ms);
  54     }
  55     return AV_NOPTS_VALUE;
  56 }
  57
  58 static int vplayer_read_header(AVFormatContext *s)
  59 {
  60     VPlayerContext *vplayer = s->priv_data;
  61     AVStream *st = avformat_new_stream(s, NULL);
  62
  63     if (!st)
  64         return AVERROR(ENOMEM);
  65     avpriv_set_pts_info(st, 64, 1, 100);
  66     st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
  67     st->codecpar->codec_id   = AV_CODEC_ID_VPLAYER;
  68
  69     while (!avio_feof(s->pb)) {
  70         char line[4096];
  71         char *p = line;
  72         const int64_t pos = avio_tell(s->pb);
  73         int len = ff_get_line(s->pb, line, sizeof(line));
  74         int64_t pts_start;
  75
  76         if (!len)
  77             break;
  78
  79         line[strcspn(line, "\r\n")] = 0;
  80
  81         pts_start = read_ts(&p);
  82         if (pts_start != AV_NOPTS_VALUE) {
  83             AVPacket *sub;
  84
  85             sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
  86             if (!sub) {
  87                 ff_subtitles_queue_clean(&vplayer->q);
  88                 return AVERROR(ENOMEM);
  89             }
  90             sub->pos = pos;
  91             sub->pts = pts_start;
  92             sub->duration = -1;
  93         }
  94     }
  95
  96     ff_subtitles_queue_finalize(s, &vplayer->q);
  97     return 0;
  98 }
  99
 100 static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
 101 {
 102     VPlayerContext *vplayer = s->priv_data;
 103     return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
 104 }
 105
 106 static int vplayer_read_seek(AVFormatContext *s, int stream_index,
 107                              int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
 108 {
 109     VPlayerContext *vplayer = s->priv_data;
 110     return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
 111                                    min_ts, ts, max_ts, flags);
 112 }
 113
 114 static int vplayer_read_close(AVFormatContext *s)
 115 {
 116     VPlayerContext *vplayer = s->priv_data;
 117     ff_subtitles_queue_clean(&vplayer->q);
 118     return 0;
 119 }
 120
 121 AVInputFormat ff_vplayer_demuxer = {
 122     .name           = "vplayer",
 123     .long_name      = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
 124     .priv_data_size = sizeof(VPlayerContext),
 125     .read_probe     = vplayer_probe,
 126     .read_header    = vplayer_read_header,
 127     .read_packet    = vplayer_read_packet,
 128     .read_seek2     = vplayer_read_seek,
 129     .read_close     = vplayer_read_close,
 130     .extensions     = "txt",
 131 };