mirror of
https://github.com/FFmpeg/FFmpeg.git
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149 lines
4.3 KiB
C
149 lines
4.3 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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* AQTitle subtitles format demuxer
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*
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* @see http://web.archive.org/web/20070210095721/http://www.volny.cz/aberka/czech/aqt.html
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* @see https://trac.annodex.net/wiki/AQTitle
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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#include "libavutil/opt.h"
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typedef struct {
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const AVClass *class;
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FFDemuxSubtitlesQueue q;
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AVRational frame_rate;
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} AQTitleContext;
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static int aqt_probe(const AVProbeData *p)
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{
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int frame;
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const char *ptr = p->buf;
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if (sscanf(ptr, "-->> %d", &frame) == 1)
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return AVPROBE_SCORE_EXTENSION;
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return 0;
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}
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static int aqt_read_header(AVFormatContext *s)
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{
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AQTitleContext *aqt = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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int new_event = 1;
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int64_t pos = 0, frame = AV_NOPTS_VALUE;
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AVPacket *sub = NULL;
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, aqt->frame_rate.den, aqt->frame_rate.num);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_TEXT;
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while (!avio_feof(s->pb)) {
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char line[4096];
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int len = ff_get_line(s->pb, line, sizeof(line));
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if (!len)
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break;
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line[strcspn(line, "\r\n")] = 0;
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if (sscanf(line, "-->> %"SCNd64, &frame) == 1) {
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new_event = 1;
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pos = avio_tell(s->pb);
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if (sub) {
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sub->duration = frame - sub->pts;
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sub = NULL;
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}
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} else if (*line) {
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if (!new_event) {
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sub = ff_subtitles_queue_insert(&aqt->q, "\n", 1, 1);
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if (!sub)
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return AVERROR(ENOMEM);
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}
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sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event);
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if (!sub)
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return AVERROR(ENOMEM);
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if (new_event) {
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sub->pts = frame;
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sub->duration = -1;
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sub->pos = pos;
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}
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new_event = 0;
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}
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}
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ff_subtitles_queue_finalize(s, &aqt->q);
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return 0;
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}
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static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AQTitleContext *aqt = s->priv_data;
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return ff_subtitles_queue_read_packet(&aqt->q, pkt);
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}
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static int aqt_read_seek(AVFormatContext *s, int stream_index,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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AQTitleContext *aqt = s->priv_data;
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return ff_subtitles_queue_seek(&aqt->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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static int aqt_read_close(AVFormatContext *s)
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{
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AQTitleContext *aqt = s->priv_data;
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ff_subtitles_queue_clean(&aqt->q);
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return 0;
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}
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#define OFFSET(x) offsetof(AQTitleContext, x)
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#define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
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static const AVOption aqt_options[] = {
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{ "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD },
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{ NULL }
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};
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static const AVClass aqt_class = {
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.class_name = "aqtdec",
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.item_name = av_default_item_name,
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.option = aqt_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_aqtitle_demuxer = {
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.name = "aqtitle",
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.long_name = NULL_IF_CONFIG_SMALL("AQTitle subtitles"),
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.priv_data_size = sizeof(AQTitleContext),
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.read_probe = aqt_probe,
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.read_header = aqt_read_header,
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.read_packet = aqt_read_packet,
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.read_seek2 = aqt_read_seek,
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.read_close = aqt_read_close,
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.extensions = "aqt",
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.priv_class = &aqt_class,
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};
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