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/*
* 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 "avcodec.h"
#include "ass.h"
#include "internal.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, void *data,
int *got_sub_ptr, AVPacket *avpkt)
{
int ret = 0;
AVBPrint buf;
AVSubtitle *sub = data;
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 void text_flush(AVCodecContext *avctx)
{
TextContext *text = avctx->priv_data;
if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
text->readorder = 0;
}
#define DECLARE_CLASS(decname) static const AVClass decname ## _decoder_class = { \
.class_name = #decname " decoder", \
.item_name = av_default_item_name, \
.option = decname ## _options, \
.version = LIBAVUTIL_VERSION_INT, \
}
#if CONFIG_TEXT_DECODER
#define text_options options
DECLARE_CLASS(text);
const AVCodec ff_text_decoder = {
.name = "text",
.long_name = NULL_IF_CONFIG_SMALL("Raw text subtitle"),
.priv_data_size = sizeof(TextContext),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_TEXT,
.decode = text_decode_frame,
.init = ff_ass_subtitle_header_default,
.priv_class = &text_decoder_class,
.flush = text_flush,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
#if CONFIG_VPLAYER_DECODER || CONFIG_PJS_DECODER || CONFIG_SUBVIEWER1_DECODER || CONFIG_STL_DECODER
static int linebreak_init(AVCodecContext *avctx)
{
TextContext *text = avctx->priv_data;
text->linebreaks = "|";
return ff_ass_subtitle_header_default(avctx);
}
#if CONFIG_VPLAYER_DECODER
#define vplayer_options options
DECLARE_CLASS(vplayer);
const AVCodec ff_vplayer_decoder = {
.name = "vplayer",
.long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitle"),
.priv_data_size = sizeof(TextContext),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_VPLAYER,
.decode = text_decode_frame,
.init = linebreak_init,
.priv_class = &vplayer_decoder_class,
.flush = text_flush,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
#if CONFIG_STL_DECODER
#define stl_options options
DECLARE_CLASS(stl);
const AVCodec ff_stl_decoder = {
.name = "stl",
.long_name = NULL_IF_CONFIG_SMALL("Spruce subtitle format"),
.priv_data_size = sizeof(TextContext),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_STL,
.decode = text_decode_frame,
.init = linebreak_init,
.priv_class = &stl_decoder_class,
.flush = text_flush,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
#if CONFIG_PJS_DECODER
#define pjs_options options
DECLARE_CLASS(pjs);
const AVCodec ff_pjs_decoder = {
.name = "pjs",
.long_name = NULL_IF_CONFIG_SMALL("PJS subtitle"),
.priv_data_size = sizeof(TextContext),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_PJS,
.decode = text_decode_frame,
.init = linebreak_init,
.priv_class = &pjs_decoder_class,
.flush = text_flush,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
#if CONFIG_SUBVIEWER1_DECODER
#define subviewer1_options options
DECLARE_CLASS(subviewer1);
const AVCodec ff_subviewer1_decoder = {
.name = "subviewer1",
.long_name = NULL_IF_CONFIG_SMALL("SubViewer1 subtitle"),
.priv_data_size = sizeof(TextContext),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_SUBVIEWER1,
.decode = text_decode_frame,
.init = linebreak_init,
.priv_class = &subviewer1_decoder_class,
.flush = text_flush,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
#endif /* text subtitles with '|' line break */
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