/*

 * 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 decoder

 *

 * @see http://web.archive.org/web/20090328040233/http://napisy.ussbrowarek.org/mpl2-eng.html

 */

#include "avcodec.h"

#include "ass.h"

#include "codec_internal.h"

#include "libavutil/bprint.h"

static int mpl2_event_to_ass(AVBPrint *buf, const char *p)

{

    if (*p == ' ')

        p++;

    while (*p) {

        int got_style = 0;

        while (*p && strchr("/\\_", *p)) {

            if      (*p == '/')  av_bprintf(buf, "{\\i1}");

            else if (*p == '\\') av_bprintf(buf, "{\\b1}");

            else if (*p == '_')  av_bprintf(buf, "{\\u1}");

            got_style = 1;

            p++;

        }

        while (*p && *p != '|') {

            if (*p != '\r' && *p != '\n')

                av_bprint_chars(buf, *p, 1);

            p++;

        }

        if (*p == '|') {

            if (got_style)

                av_bprintf(buf, "{\\r}");

            av_bprintf(buf, "\\N");

            p++;

        }

    }

    return 0;

}

static int mpl2_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,

                             int *got_sub_ptr, const AVPacket *avpkt)

{

    int ret = 0;

    AVBPrint buf;

    const char *ptr = avpkt->data;

    FFASSDecoderContext *s = avctx->priv_data;

    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);

    if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr))

        ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);

    av_bprint_finalize(&buf, NULL);

    if (ret < 0)

        return ret;

    *got_sub_ptr = sub->num_rects > 0;

    return avpkt->size;

}

const FFCodec ff_mpl2_decoder = {

    .p.name         = "mpl2",

    CODEC_LONG_NAME("MPL2 subtitle"),

    .p.type         = AVMEDIA_TYPE_SUBTITLE,

    .p.id           = AV_CODEC_ID_MPL2,

    FF_CODEC_DECODE_SUB_CB(mpl2_decode_frame),

    .init           = ff_ass_subtitle_header_default,

    .flush          = ff_ass_decoder_flush,

    .priv_data_size = sizeof(FFASSDecoderContext),

};