mirror of
https://github.com/FFmpeg/FFmpeg.git
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97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MPL2 subtitles decoder
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*
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* @see http://web.archive.org/web/20090328040233/http://napisy.ussbrowarek.org/mpl2-eng.html
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*/
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#include "avcodec.h"
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#include "ass.h"
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#include "libavutil/bprint.h"
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static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
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{
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if (*p == ' ')
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p++;
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while (*p) {
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int got_style = 0;
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while (*p && strchr("/\\_", *p)) {
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if (*p == '/') av_bprintf(buf, "{\\i1}");
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else if (*p == '\\') av_bprintf(buf, "{\\b1}");
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else if (*p == '_') av_bprintf(buf, "{\\u1}");
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got_style = 1;
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p++;
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}
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while (*p && *p != '|') {
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if (*p != '\r' && *p != '\n')
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av_bprint_chars(buf, *p, 1);
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p++;
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}
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if (*p == '|') {
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if (got_style)
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av_bprintf(buf, "{\\r}");
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av_bprintf(buf, "\\N");
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p++;
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}
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}
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av_bprintf(buf, "\r\n");
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return 0;
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}
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static int mpl2_decode_frame(AVCodecContext *avctx, void *data,
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int *got_sub_ptr, AVPacket *avpkt)
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{
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AVBPrint buf;
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AVSubtitle *sub = data;
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const char *ptr = avpkt->data;
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const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100});
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const int ts_duration = avpkt->duration != -1 ?
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av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr)) {
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if (!av_bprint_is_complete(&buf)) {
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av_bprint_finalize(&buf, NULL);
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return AVERROR(ENOMEM);
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}
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ff_ass_add_rect(sub, buf.str, ts_start, ts_duration, 0);
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}
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*got_sub_ptr = sub->num_rects > 0;
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av_bprint_finalize(&buf, NULL);
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return avpkt->size;
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}
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AVCodec ff_mpl2_decoder = {
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.name = "mpl2",
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.long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_MPL2,
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.decode = mpl2_decode_frame,
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.init = ff_ass_subtitle_header_default,
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};
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