mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 03:39:45 +00:00
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
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* Copyright (c) 2014 Eejya Singh
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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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* STL subtitles format demuxer
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* @see https://documentation.apple.com/en/dvdstudiopro/usermanual/index.html#chapter=19%26section=13%26tasks=true
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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/intreadwrite.h"
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#include "libavutil/avstring.h"
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typedef struct {
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FFDemuxSubtitlesQueue q;
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} STLContext;
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static int stl_probe(const AVProbeData *p)
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{
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char c;
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const unsigned char *ptr = p->buf;
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if (AV_RB24(ptr) == 0xEFBBBF)
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ptr += 3; /* skip UTF-8 BOM */
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while (*ptr == '\r' || *ptr == '\n' || *ptr == '$' || !strncmp(ptr, "//" , 2))
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ptr += ff_subtitles_next_line(ptr);
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if (sscanf(ptr, "%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d , %c", &c) == 1)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int64_t get_pts(char **buf, int *duration)
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{
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int hh1, mm1, ss1, ms1;
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int hh2, mm2, ss2, ms2;
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int len = 0;
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if (sscanf(*buf, "%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , %n",
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&hh1, &mm1, &ss1, &ms1,
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&hh2, &mm2, &ss2, &ms2, &len) >= 8 && len > 0) {
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int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
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int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
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*duration = end - start;
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*buf += len;
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return start;
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}
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return AV_NOPTS_VALUE;
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}
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static int stl_read_header(AVFormatContext *s)
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{
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STLContext *stl = 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, 100);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_STL;
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while (!avio_feof(s->pb)) {
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char line[4096];
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char *p = line;
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const int64_t pos = avio_tell(s->pb);
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int len = ff_get_line(s->pb, line, sizeof(line));
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int64_t pts_start;
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int duration;
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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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pts_start = get_pts(&p , &duration);
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if (pts_start != AV_NOPTS_VALUE) {
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AVPacket *sub;
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sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 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 = duration;
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}
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}
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ff_subtitles_queue_finalize(s, &stl->q);
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return 0;
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}
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static int stl_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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STLContext *stl = s->priv_data;
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return ff_subtitles_queue_read_packet(&stl->q, pkt);
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}
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static int stl_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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STLContext *stl = s->priv_data;
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return ff_subtitles_queue_seek(&stl->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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static int stl_read_close(AVFormatContext *s)
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{
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STLContext *stl = s->priv_data;
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ff_subtitles_queue_clean(&stl->q);
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return 0;
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}
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AVInputFormat ff_stl_demuxer = {
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.name = "stl",
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.long_name = NULL_IF_CONFIG_SMALL("Spruce subtitle format"),
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.priv_data_size = sizeof(STLContext),
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.read_probe = stl_probe,
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.read_header = stl_read_header,
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.read_packet = stl_read_packet,
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.read_seek2 = stl_read_seek,
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.read_close = stl_read_close,
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.extensions = "stl",
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};
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