84 lines
2.7 KiB
C
84 lines
2.7 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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* SubViewer subtitle decoder
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* @see https://en.wikipedia.org/wiki/SubViewer
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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 subviewer_event_to_ass(AVBPrint *buf, const char *p)
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{
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while (*p) {
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if (!strncmp(p, "[br]", 4)) {
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av_bprintf(buf, "\\N");
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p += 4;
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} else {
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if (p[0] == '\n' && p[1])
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av_bprintf(buf, "\\N");
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else if (*p != '\n' && *p != '\r')
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av_bprint_chars(buf, *p, 1);
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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 subviewer_decode_frame(AVCodecContext *avctx,
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void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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char c;
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AVSubtitle *sub = data;
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const char *ptr = avpkt->data;
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AVBPrint buf;
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/* To be removed later */
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if (ptr && sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) {
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av_log(avctx, AV_LOG_ERROR, "AVPacket is not clean (contains timing "
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"information). You need to upgrade your libavformat or "
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"sanitize your packet.\n");
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return AVERROR_INVALIDDATA;
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}
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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// note: no need to rescale pts & duration since they are in the same
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// timebase as ASS (1/100)
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if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
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ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0);
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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_subviewer_decoder = {
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.name = "subviewer",
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.long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_SUBVIEWER,
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.decode = subviewer_decode_frame,
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.init = ff_ass_subtitle_header_default,
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};
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