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/* |
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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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✓✓ |
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while (*p) { |
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✓✓ |
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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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✓✓ |
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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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✓✓ |
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if (!*p) |
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break; |
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✓✓ |
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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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✓✓ |
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if (*p == '<') |
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skip = 1; |
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✓✓ |
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else if (*p == '>') |
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skip = 0; |
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✓✓✓✗
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else if (p[0] == '\n' && p[1]) |
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av_bprintf(buf, "\\N"); |
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✓✓✓✓
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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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✓✗✓✗
✓✗ |
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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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✗✓ |
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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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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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}; |