/*
  * 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
  * MPL2 subtitles format demuxer
  */
 
 #include "avformat.h"
 #include "internal.h"
 #include "subtitles.h"
 
 typedef struct {
     FFDemuxSubtitlesQueue q;
 } MPL2Context;
 
 static int mpl2_probe(AVProbeData *p)
 {
     int i;
     char c;
     int64_t start, end;
     const unsigned char *ptr = p->buf;
     const unsigned char *ptr_end = ptr + p->buf_size;
 
     for (i = 0; i < 2; i++) {

         if (sscanf(ptr, "[%"SCNd64"][%"SCNd64"]%c", &start, &end, &c) != 3 &&
             sscanf(ptr, "[%"SCNd64"][]%c",          &start,       &c) != 2)

             return 0;

         ptr += ff_subtitles_next_line(ptr);

         if (ptr >= ptr_end)
             return 0;
     }
     return AVPROBE_SCORE_MAX;
 }
 
 static int read_ts(char **line, int64_t *pts_start, int *duration)
 {
     char c;
     int len;
     int64_t end;
 

     if (sscanf(*line, "[%"SCNd64"][]%c%n",

                pts_start, &c, &len) >= 2) {
         *duration = -1;
         *line += len - 1;
         return 0;
     }

     if (sscanf(*line, "[%"SCNd64"][%"SCNd64"]%c%n",

                pts_start, &end, &c, &len) >= 3) {
         *duration = end - *pts_start;
         *line += len - 1;
         return 0;
     }
     return -1;
 }
 
 static int mpl2_read_header(AVFormatContext *s)
 {
     MPL2Context *mpl2 = 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_MPL2;
 

     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;
 
         if (!read_ts(&p, &pts_start, &duration)) {
             AVPacket *sub;
 
             sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0);
             if (!sub)
                 return AVERROR(ENOMEM);
             sub->pos = pos;
             sub->pts = pts_start;
             sub->duration = duration;
         }
     }
 
     ff_subtitles_queue_finalize(&mpl2->q);
     return res;
 }
 
 static int mpl2_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     MPL2Context *mpl2 = s->priv_data;
     return ff_subtitles_queue_read_packet(&mpl2->q, pkt);
 }
 
 static int mpl2_read_seek(AVFormatContext *s, int stream_index,
                           int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
 {
     MPL2Context *mpl2 = s->priv_data;
     return ff_subtitles_queue_seek(&mpl2->q, s, stream_index,
                                    min_ts, ts, max_ts, flags);
 }
 
 static int mpl2_read_close(AVFormatContext *s)
 {
     MPL2Context *mpl2 = s->priv_data;
     ff_subtitles_queue_clean(&mpl2->q);
     return 0;
 }
 
 AVInputFormat ff_mpl2_demuxer = {
     .name           = "mpl2",
     .long_name      = NULL_IF_CONFIG_SMALL("MPL2 subtitles"),
     .priv_data_size = sizeof(MPL2Context),
     .read_probe     = mpl2_probe,
     .read_header    = mpl2_read_header,
     .read_packet    = mpl2_read_packet,
     .read_seek2     = mpl2_read_seek,
     .read_close     = mpl2_read_close,
     .extensions     = "txt,mpl2",
 };