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https://github.com/FFmpeg/FFmpeg.git
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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
111 lines
3.3 KiB
C
111 lines
3.3 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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* WebVTT subtitle decoder
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* @see http://dev.w3.org/html5/webvtt/
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* @todo need to support extended markups and cue settings
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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 const struct {
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const char *from;
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const char *to;
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} webvtt_tag_replace[] = {
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{"<i>", "{\\i1}"}, {"</i>", "{\\i0}"},
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{"<b>", "{\\b1}"}, {"</b>", "{\\b0}"},
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{"<u>", "{\\u1}"}, {"</u>", "{\\u0}"},
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{"{", "\\{"}, {"}", "\\}"}, // escape to avoid ASS markup conflicts
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{">", ">"}, {"<", "<"},
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{"‎", ""}, {"‏", ""}, // FIXME: properly honor bidi marks
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{"&", "&"}, {" ", "\\h"},
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};
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static int webvtt_event_to_ass(AVBPrint *buf, const char *p)
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{
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int i, again = 0, skip = 0;
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while (*p) {
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for (i = 0; i < FF_ARRAY_ELEMS(webvtt_tag_replace); i++) {
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const char *from = webvtt_tag_replace[i].from;
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const size_t len = strlen(from);
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if (!strncmp(p, from, len)) {
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av_bprintf(buf, "%s", webvtt_tag_replace[i].to);
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p += len;
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again = 1;
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break;
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}
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}
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if (!*p)
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break;
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if (again) {
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again = 0;
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skip = 0;
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continue;
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}
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if (*p == '<')
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skip = 1;
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else if (*p == '>')
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skip = 0;
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else if (p[0] == '\n' && p[1])
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av_bprintf(buf, "\\N");
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else if (!skip && *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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return 0;
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}
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static int webvtt_decode_frame(AVCodecContext *avctx,
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void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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int ret = 0;
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AVSubtitle *sub = data;
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const char *ptr = avpkt->data;
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FFASSDecoderContext *s = avctx->priv_data;
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AVBPrint buf;
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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if (ptr && avpkt->size > 0 && !webvtt_event_to_ass(&buf, ptr))
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ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
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av_bprint_finalize(&buf, NULL);
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if (ret < 0)
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return ret;
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*got_sub_ptr = sub->num_rects > 0;
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return avpkt->size;
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}
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const AVCodec ff_webvtt_decoder = {
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.name = "webvtt",
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.long_name = NULL_IF_CONFIG_SMALL("WebVTT subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_WEBVTT,
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.decode = webvtt_decode_frame,
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.init = ff_ass_subtitle_header_default,
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.flush = ff_ass_decoder_flush,
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.priv_data_size = sizeof(FFASSDecoderContext),
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};
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