/*
  * Copyright (c) 2012 Clément Bœsch
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * VPlayer subtitles format demuxer
  */
 
 #include "avformat.h"
 #include "internal.h"
 #include "subtitles.h"
 
 typedef struct {
     FFDemuxSubtitlesQueue q;
 } VPlayerContext;
 
 static int vplayer_probe(AVProbeData *p)
 {
     char c;
     const unsigned char *ptr = p->buf;
 
     if (sscanf(ptr, "%*d:%*d:%*d.%*d%c", &c) == 1 && strchr(": =", c))
         return AVPROBE_SCORE_MAX;
     return 0;
 }
 
 static int64_t read_ts(char **line)
 {
     char c;
     int hh, mm, ss, ms, len;
 
     if (sscanf(*line, "%d:%d:%d.%d%c%n",
                &hh, &mm, &ss, &ms, &c, &len) >= 5) {
         *line += len;
         return (hh*3600LL + mm*60LL + ss) * 100LL + ms;
     }
     return AV_NOPTS_VALUE;
 }
 
 static int vplayer_read_header(AVFormatContext *s)
 {
     VPlayerContext *vplayer = s->priv_data;
     AVStream *st = avformat_new_stream(s, NULL);
 
     if (!st)
         return AVERROR(ENOMEM);
     avpriv_set_pts_info(st, 64, 1, 100);
     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
     st->codec->codec_id   = AV_CODEC_ID_VPLAYER;
 

     while (!avio_feof(s->pb)) {

         char line[4096];
         char *p = line;
         const int64_t pos = avio_tell(s->pb);
         int len = ff_get_line(s->pb, line, sizeof(line));
         int64_t pts_start;
 
         if (!len)
             break;
 
         line[strcspn(line, "\r\n")] = 0;
 
         pts_start = read_ts(&p);
         if (pts_start != AV_NOPTS_VALUE) {
             AVPacket *sub;
 
             sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
             if (!sub)
                 return AVERROR(ENOMEM);
             sub->pos = pos;
             sub->pts = pts_start;
             sub->duration = -1;
         }
     }
 

     ff_subtitles_queue_finalize(s, &vplayer->q);

     return 0;
 }
 
 static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     VPlayerContext *vplayer = s->priv_data;
     return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
 }
 
 static int vplayer_read_seek(AVFormatContext *s, int stream_index,
                              int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
 {
     VPlayerContext *vplayer = s->priv_data;
     return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
                                    min_ts, ts, max_ts, flags);
 }
 
 static int vplayer_read_close(AVFormatContext *s)
 {
     VPlayerContext *vplayer = s->priv_data;
     ff_subtitles_queue_clean(&vplayer->q);
     return 0;
 }
 
 AVInputFormat ff_vplayer_demuxer = {
     .name           = "vplayer",
     .long_name      = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
     .priv_data_size = sizeof(VPlayerContext),
     .read_probe     = vplayer_probe,
     .read_header    = vplayer_read_header,
     .read_packet    = vplayer_read_packet,
     .read_seek2     = vplayer_read_seek,
     .read_close     = vplayer_read_close,
     .extensions     = "txt",
 };