/*
  * 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
  * SubViewer v1 subtitle demuxer
  */
 
 #include "avformat.h"
 #include "internal.h"
 #include "subtitles.h"
 
 typedef struct {
     FFDemuxSubtitlesQueue q;
 } SubViewer1Context;
 
 static int subviewer1_probe(AVProbeData *p)
 {
     const unsigned char *ptr = p->buf;
 
     if (strstr(ptr, "******** START SCRIPT ********"))

         return AVPROBE_SCORE_EXTENSION;

     return 0;
 }
 
 static int subviewer1_read_header(AVFormatContext *s)
 {
     int delay = 0;
     AVPacket *sub = NULL;
     SubViewer1Context *subviewer1 = s->priv_data;
     AVStream *st = avformat_new_stream(s, NULL);
 
     if (!st)
         return AVERROR(ENOMEM);
     avpriv_set_pts_info(st, 64, 1, 1);
     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
     st->codec->codec_id   = AV_CODEC_ID_SUBVIEWER1;
 
     while (!url_feof(s->pb)) {
         char line[4096];
         int len = ff_get_line(s->pb, line, sizeof(line));
         int hh, mm, ss;
 
         if (!len)
             break;
 
         if (!strncmp(line, "[DELAY]", 7)) {
             ff_get_line(s->pb, line, sizeof(line));
             sscanf(line, "%d", &delay);
         }
 
         if (sscanf(line, "[%d:%d:%d]", &hh, &mm, &ss) == 3) {
             const int64_t pos = avio_tell(s->pb);
             int64_t pts_start = hh*3600LL + mm*60LL + ss + delay;
 
             len = ff_get_line(s->pb, line, sizeof(line));
             line[strcspn(line, "\r\n")] = 0;
             if (!*line) {
                 if (sub)
                     sub->duration = pts_start - sub->pts;
             } else {
                 sub = ff_subtitles_queue_insert(&subviewer1->q, line, len, 0);
                 if (!sub)
                     return AVERROR(ENOMEM);
                 sub->pos = pos;
                 sub->pts = pts_start;
                 sub->duration = -1;
             }
         }
     }
 
     ff_subtitles_queue_finalize(&subviewer1->q);
     return 0;
 }
 
 static int subviewer1_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     SubViewer1Context *subviewer1 = s->priv_data;
     return ff_subtitles_queue_read_packet(&subviewer1->q, pkt);
 }
 
 static int subviewer1_read_seek(AVFormatContext *s, int stream_index,
                                int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
 {
     SubViewer1Context *subviewer1 = s->priv_data;
     return ff_subtitles_queue_seek(&subviewer1->q, s, stream_index,
                                    min_ts, ts, max_ts, flags);
 }
 
 static int subviewer1_read_close(AVFormatContext *s)
 {
     SubViewer1Context *subviewer1 = s->priv_data;
     ff_subtitles_queue_clean(&subviewer1->q);
     return 0;
 }
 
 AVInputFormat ff_subviewer1_demuxer = {
     .name           = "subviewer1",
     .long_name      = NULL_IF_CONFIG_SMALL("SubViewer v1 subtitle format"),
     .priv_data_size = sizeof(SubViewer1Context),
     .read_probe     = subviewer1_probe,
     .read_header    = subviewer1_read_header,
     .read_packet    = subviewer1_read_packet,
     .read_seek2     = subviewer1_read_seek,
     .read_close     = subviewer1_read_close,
     .extensions     = "sub",
 };