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/*
* SSA/ASS decoder
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
*
* 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
*/

#include <string.h>

#include "avcodec.h"
#include "ass.h"
#include "ass_split.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"

static av_cold int ass_decode_init(AVCodecContext *avctx)
{
    avctx->subtitle_header = av_malloc(avctx->extradata_size);
    if (!avctx->subtitle_header)
        return AVERROR(ENOMEM);
    memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
    avctx->subtitle_header_size = avctx->extradata_size;
    avctx->priv_data = ff_ass_split(avctx->extradata);
    if(!avctx->priv_data)
        return -1;
    return 0;
}

static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
                            AVPacket *avpkt)
{
    const char *ptr = avpkt->data;
    int len, size = avpkt->size;

    while (size > 0) {
        int duration;
        ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL);
        if (!dialog)
            return AVERROR_INVALIDDATA;
        duration = dialog->end - dialog->start;
        len = ff_ass_add_rect(data, ptr, 0, duration, 1);
        if (len < 0)
            return len;
        ptr += len;
        size -= len;
    }

    *got_sub_ptr = avpkt->size > 0;
    return avpkt->size;
}

static int ass_decode_close(AVCodecContext *avctx)
{
    ff_ass_split_free(avctx->priv_data);
    avctx->priv_data = NULL;
    return 0;
}

AVCodec ff_ass_decoder = {
    .name = "ass",
    .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
    .type = AVMEDIA_TYPE_SUBTITLE,
    .id = AV_CODEC_ID_SSA,
    .init = ass_decode_init,
    .decode = ass_decode_frame,
    .close = ass_decode_close,
};
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