mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 11:44:49 +00:00
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 2014 Eejya Singh
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* STL subtitles format demuxer
|
|
* @see https://documentation.apple.com/en/dvdstudiopro/usermanual/index.html#chapter=19%26section=13%26tasks=true
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "subtitles.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/avstring.h"
|
|
|
|
typedef struct {
|
|
FFDemuxSubtitlesQueue q;
|
|
} STLContext;
|
|
|
|
static int stl_probe(const AVProbeData *p)
|
|
{
|
|
char c;
|
|
const unsigned char *ptr = p->buf;
|
|
|
|
if (AV_RB24(ptr) == 0xEFBBBF)
|
|
ptr += 3; /* skip UTF-8 BOM */
|
|
|
|
while (*ptr == '\r' || *ptr == '\n' || *ptr == '$' || !strncmp(ptr, "//" , 2))
|
|
ptr += ff_subtitles_next_line(ptr);
|
|
|
|
if (sscanf(ptr, "%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d , %c", &c) == 1)
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int64_t get_pts(char **buf, int *duration)
|
|
{
|
|
int hh1, mm1, ss1, ms1;
|
|
int hh2, mm2, ss2, ms2;
|
|
int len = 0;
|
|
|
|
if (sscanf(*buf, "%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , %n",
|
|
&hh1, &mm1, &ss1, &ms1,
|
|
&hh2, &mm2, &ss2, &ms2, &len) >= 8 && len > 0) {
|
|
int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
|
|
int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
|
|
*duration = end - start;
|
|
*buf += len;
|
|
return start;
|
|
}
|
|
return AV_NOPTS_VALUE;
|
|
}
|
|
|
|
static int stl_read_header(AVFormatContext *s)
|
|
{
|
|
STLContext *stl = s->priv_data;
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
avpriv_set_pts_info(st, 64, 1, 100);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codecpar->codec_id = AV_CODEC_ID_STL;
|
|
|
|
while (!avio_feof(s->pb)) {
|
|
char line[4096];
|
|
char *p = line;
|
|
const int64_t pos = avio_tell(s->pb);
|
|
int len = ff_get_line(s->pb, line, sizeof(line));
|
|
int64_t pts_start;
|
|
int duration;
|
|
|
|
if (!len)
|
|
break;
|
|
|
|
line[strcspn(line, "\r\n")] = 0;
|
|
pts_start = get_pts(&p , &duration);
|
|
|
|
if (pts_start != AV_NOPTS_VALUE) {
|
|
AVPacket *sub;
|
|
sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0);
|
|
if (!sub)
|
|
return AVERROR(ENOMEM);
|
|
sub->pos = pos;
|
|
sub->pts = pts_start;
|
|
sub->duration = duration;
|
|
}
|
|
}
|
|
ff_subtitles_queue_finalize(s, &stl->q);
|
|
return 0;
|
|
}
|
|
static int stl_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
STLContext *stl = s->priv_data;
|
|
return ff_subtitles_queue_read_packet(&stl->q, pkt);
|
|
}
|
|
|
|
static int stl_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
|
|
{
|
|
STLContext *stl = s->priv_data;
|
|
return ff_subtitles_queue_seek(&stl->q, s, stream_index,
|
|
min_ts, ts, max_ts, flags);
|
|
}
|
|
|
|
static int stl_read_close(AVFormatContext *s)
|
|
{
|
|
STLContext *stl = s->priv_data;
|
|
ff_subtitles_queue_clean(&stl->q);
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_stl_demuxer = {
|
|
.name = "stl",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Spruce subtitle format"),
|
|
.priv_data_size = sizeof(STLContext),
|
|
.read_probe = stl_probe,
|
|
.read_header = stl_read_header,
|
|
.read_packet = stl_read_packet,
|
|
.read_seek2 = stl_read_seek,
|
|
.read_close = stl_read_close,
|
|
.extensions = "stl",
|
|
};
|