/*
  * 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
  * PJS (Phoenix Japanimation Society) subtitles format demuxer
  *
  * @see http://subs.com.ru/page.php?al=pjs
  */
 
 #include "avformat.h"
 #include "internal.h"
 #include "subtitles.h"
 
 typedef struct {
     FFDemuxSubtitlesQueue q;
 } PJSContext;
 
 static int pjs_probe(AVProbeData *p)
 {
     char c;
     int64_t start, end;
     const unsigned char *ptr = p->buf;
 

     if (sscanf(ptr, "%"SCNd64",%"SCNd64",%c", &start, &end, &c) == 3) {

         size_t q1pos = strcspn(ptr, "\"");
         size_t q2pos = q1pos + strcspn(ptr + q1pos + 1, "\"") + 1;
         if (strcspn(ptr, "\r\n") > q2pos)
             return AVPROBE_SCORE_MAX;
     }
     return 0;
 }
 
 static int64_t read_ts(char **line, int *duration)
 {
     int64_t start, end;
 

     if (sscanf(*line, "%"SCNd64",%"SCNd64, &start, &end) == 2) {

         *line += strcspn(*line, "\"");
         *line += !!**line;

         *duration = end - start;
         return start;
     }
     return AV_NOPTS_VALUE;
 }
 
 static int pjs_read_header(AVFormatContext *s)
 {
     PJSContext *pjs = s->priv_data;
     AVStream *st = avformat_new_stream(s, NULL);
     int res = 0;
 
     if (!st)
         return AVERROR(ENOMEM);
     avpriv_set_pts_info(st, 64, 1, 10);
     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
     st->codec->codec_id   = AV_CODEC_ID_PJS;
 

     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;
         int duration;
 
         if (!len)
             break;
 
         line[strcspn(line, "\r\n")] = 0;
 
         pts_start = read_ts(&p, &duration);
         if (pts_start != AV_NOPTS_VALUE) {
             AVPacket *sub;
 
             p[strcspn(p, "\"")] = 0;
             sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
             if (!sub)
                 return AVERROR(ENOMEM);
             sub->pos = pos;
             sub->pts = pts_start;
             sub->duration = duration;
         }
     }
 
     ff_subtitles_queue_finalize(&pjs->q);
     return res;
 }
 
 static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     PJSContext *pjs = s->priv_data;
     return ff_subtitles_queue_read_packet(&pjs->q, pkt);
 }
 
 static int pjs_read_seek(AVFormatContext *s, int stream_index,
                          int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
 {
     PJSContext *pjs = s->priv_data;
     return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
                                    min_ts, ts, max_ts, flags);
 }
 
 static int pjs_read_close(AVFormatContext *s)
 {
     PJSContext *pjs = s->priv_data;
     ff_subtitles_queue_clean(&pjs->q);
     return 0;
 }
 
 AVInputFormat ff_pjs_demuxer = {
     .name           = "pjs",
     .long_name      = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
     .priv_data_size = sizeof(PJSContext),
     .read_probe     = pjs_probe,
     .read_header    = pjs_read_header,
     .read_packet    = pjs_read_packet,
     .read_seek2     = pjs_read_seek,
     .read_close     = pjs_read_close,
     .extensions     = "pjs",
 };