/*

 * 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 "demux.h"

#include "internal.h"

#include "subtitles.h"

typedef struct {

    FFDemuxSubtitlesQueue q;

} PJSContext;

static int pjs_probe(const 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;

        if (end < start || end - (uint64_t)start > INT_MAX)

            return AV_NOPTS_VALUE;

        *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);

    if (!st)

        return AVERROR(ENOMEM);

    avpriv_set_pts_info(st, 64, 1, 10);

    st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;

    st->codecpar->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(s, &pjs->q);

    return 0;

}

const FFInputFormat ff_pjs_demuxer = {

    .p.name         = "pjs",

    .p.long_name    = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),

    .p.extensions   = "pjs",

    .priv_data_size = sizeof(PJSContext),

    .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,

    .read_probe     = pjs_probe,

    .read_header    = pjs_read_header,

    .read_packet    = ff_subtitles_read_packet,

    .read_seek2     = ff_subtitles_read_seek,

    .read_close     = ff_subtitles_read_close,

};