mirror of
https://github.com/FFmpeg/FFmpeg.git
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125 lines
3.7 KiB
C
125 lines
3.7 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 v1 subtitle demuxer
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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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typedef struct {
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FFDemuxSubtitlesQueue q;
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} SubViewer1Context;
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static int subviewer1_probe(const AVProbeData *p)
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{
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const unsigned char *ptr = p->buf;
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if (strstr(ptr, "******** START SCRIPT ********"))
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return AVPROBE_SCORE_EXTENSION;
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return 0;
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}
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static int subviewer1_read_header(AVFormatContext *s)
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{
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int delay = 0;
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AVPacket *sub = NULL;
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SubViewer1Context *subviewer1 = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, 1);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_SUBVIEWER1;
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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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int hh, mm, ss;
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if (!len)
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break;
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if (!strncmp(line, "[DELAY]", 7)) {
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ff_get_line(s->pb, line, sizeof(line));
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sscanf(line, "%d", &delay);
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}
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if (sscanf(line, "[%d:%d:%d]", &hh, &mm, &ss) == 3) {
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const int64_t pos = avio_tell(s->pb);
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int64_t pts_start = hh*3600LL + mm*60LL + ss + delay;
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len = ff_get_line(s->pb, line, sizeof(line));
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line[strcspn(line, "\r\n")] = 0;
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if (!*line) {
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if (sub)
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sub->duration = pts_start - sub->pts;
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} else {
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sub = ff_subtitles_queue_insert(&subviewer1->q, line, len, 0);
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if (!sub)
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return AVERROR(ENOMEM);
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sub->pos = pos;
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sub->pts = pts_start;
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sub->duration = -1;
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}
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}
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}
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ff_subtitles_queue_finalize(s, &subviewer1->q);
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return 0;
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}
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static int subviewer1_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SubViewer1Context *subviewer1 = s->priv_data;
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return ff_subtitles_queue_read_packet(&subviewer1->q, pkt);
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}
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static int subviewer1_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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SubViewer1Context *subviewer1 = s->priv_data;
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return ff_subtitles_queue_seek(&subviewer1->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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static int subviewer1_read_close(AVFormatContext *s)
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{
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SubViewer1Context *subviewer1 = s->priv_data;
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ff_subtitles_queue_clean(&subviewer1->q);
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return 0;
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}
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AVInputFormat ff_subviewer1_demuxer = {
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.name = "subviewer1",
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.long_name = NULL_IF_CONFIG_SMALL("SubViewer v1 subtitle format"),
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.priv_data_size = sizeof(SubViewer1Context),
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.read_probe = subviewer1_probe,
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.read_header = subviewer1_read_header,
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.read_packet = subviewer1_read_packet,
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.read_seek2 = subviewer1_read_seek,
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.read_close = subviewer1_read_close,
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.extensions = "sub",
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};
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