/*

 * 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

 * Raw subtitles decoder

 */

#include "config_components.h"

#include "avcodec.h"

#include "ass.h"

#include "codec_internal.h"

#include "libavutil/attributes.h"

#include "libavutil/bprint.h"

#include "libavutil/opt.h"

typedef struct {

    AVClass *class;

    const char *linebreaks;

    int keep_ass_markup;

    int readorder;

} TextContext;

#define OFFSET(x) offsetof(TextContext, x)

#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

static const AVOption options[] = {

    { "keep_ass_markup", "Set if ASS tags must be escaped", OFFSET(keep_ass_markup), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags=SD },

    { NULL }

};

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

                             int *got_sub_ptr, const AVPacket *avpkt)

{

    int ret = 0;

    AVBPrint buf;

    const char *ptr = avpkt->data;

    TextContext *text = avctx->priv_data;

    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);

    if (ptr && avpkt->size > 0 && *ptr) {

        ff_ass_bprint_text_event(&buf, ptr, avpkt->size, text->linebreaks, text->keep_ass_markup);

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

    }

    av_bprint_finalize(&buf, NULL);

    if (ret < 0)

        return ret;

    *got_sub_ptr = sub->num_rects > 0;

    return avpkt->size;

}

static av_cold void text_flush(AVCodecContext *avctx)

{

    TextContext *text = avctx->priv_data;

    if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))

        text->readorder = 0;

}

static const AVClass textsub_decoder_class = {

    .class_name = "text/vplayer/stl/pjs/subviewer1 decoder",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

#if CONFIG_TEXT_DECODER

const FFCodec ff_text_decoder = {

    .p.name         = "text",

    CODEC_LONG_NAME("Raw text subtitle"),

    .priv_data_size = sizeof(TextContext),

    .p.type         = AVMEDIA_TYPE_SUBTITLE,

    .p.id           = AV_CODEC_ID_TEXT,

    FF_CODEC_DECODE_SUB_CB(text_decode_frame),

    .init           = ff_ass_subtitle_header_default,

    .p.priv_class   = &textsub_decoder_class,

    .flush          = text_flush,

};

#endif

#if CONFIG_VPLAYER_DECODER || CONFIG_PJS_DECODER || CONFIG_SUBVIEWER1_DECODER || CONFIG_STL_DECODER

static av_cold int linebreak_init(AVCodecContext *avctx)

{

    TextContext *text = avctx->priv_data;

    text->linebreaks = "|";

    return ff_ass_subtitle_header_default(avctx);

}

#if CONFIG_VPLAYER_DECODER

const FFCodec ff_vplayer_decoder = {

    .p.name         = "vplayer",

    CODEC_LONG_NAME("VPlayer subtitle"),

    .priv_data_size = sizeof(TextContext),

    .p.type         = AVMEDIA_TYPE_SUBTITLE,

    .p.id           = AV_CODEC_ID_VPLAYER,

    FF_CODEC_DECODE_SUB_CB(text_decode_frame),

    .init           = linebreak_init,

    .p.priv_class   = &textsub_decoder_class,

    .flush          = text_flush,

};

#endif

#if CONFIG_STL_DECODER

const FFCodec ff_stl_decoder = {

    .p.name         = "stl",

    CODEC_LONG_NAME("Spruce subtitle format"),

    .priv_data_size = sizeof(TextContext),

    .p.type         = AVMEDIA_TYPE_SUBTITLE,

    .p.id           = AV_CODEC_ID_STL,

    FF_CODEC_DECODE_SUB_CB(text_decode_frame),

    .init           = linebreak_init,

    .p.priv_class   = &textsub_decoder_class,

    .flush          = text_flush,

};

#endif

#if CONFIG_PJS_DECODER

const FFCodec ff_pjs_decoder = {

    .p.name         = "pjs",

    CODEC_LONG_NAME("PJS subtitle"),

    .priv_data_size = sizeof(TextContext),

    .p.type         = AVMEDIA_TYPE_SUBTITLE,

    .p.id           = AV_CODEC_ID_PJS,

    FF_CODEC_DECODE_SUB_CB(text_decode_frame),

    .init           = linebreak_init,

    .p.priv_class   = &textsub_decoder_class,

    .flush          = text_flush,

};

#endif

#if CONFIG_SUBVIEWER1_DECODER

const FFCodec ff_subviewer1_decoder = {

    .p.name         = "subviewer1",

    CODEC_LONG_NAME("SubViewer1 subtitle"),

    .priv_data_size = sizeof(TextContext),

    .p.type         = AVMEDIA_TYPE_SUBTITLE,

    .p.id           = AV_CODEC_ID_SUBVIEWER1,

    FF_CODEC_DECODE_SUB_CB(text_decode_frame),

    .init           = linebreak_init,

    .p.priv_class   = &textsub_decoder_class,

    .flush          = text_flush,

};

#endif

#endif /* text subtitles with '|' line break */