mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-23 07:42:51 +00:00
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
|
|
* SubRip subtitle demuxer
|
|
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
static int srt_probe(AVProbeData *p)
|
|
{
|
|
unsigned char *ptr = p->buf;
|
|
int i, v, num = 0;
|
|
|
|
if (AV_RB24(ptr) == 0xEFBBBF)
|
|
ptr += 3; /* skip UTF-8 BOM */
|
|
|
|
for (i=0; i<2; i++) {
|
|
if (num == i && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1)
|
|
return AVPROBE_SCORE_MAX;
|
|
num = atoi(ptr);
|
|
ptr += strcspn(ptr, "\n") + 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int srt_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
AVStream *st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return -1;
|
|
av_set_pts_info(st, 64, 1, 1000);
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_id = CODEC_ID_SRT;
|
|
return 0;
|
|
}
|
|
|
|
static int64_t get_pts(const char *buf)
|
|
{
|
|
int i, v, hour, min, sec, hsec;
|
|
|
|
for (i=0; i<2; i++) {
|
|
if (sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %*d:%*2d:%*2d%*1[,.]%3d",
|
|
&hour, &min, &sec, &hsec, &v) == 5) {
|
|
min += 60*hour;
|
|
sec += 60*min;
|
|
return sec*1000+hsec;
|
|
}
|
|
buf += strcspn(buf, "\n") + 1;
|
|
}
|
|
return AV_NOPTS_VALUE;
|
|
}
|
|
|
|
static inline int is_eol(char c)
|
|
{
|
|
return c == '\r' || c == '\n';
|
|
}
|
|
|
|
static int srt_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
char buffer[2048], *ptr = buffer, *ptr2;
|
|
int64_t pos = avio_tell(s->pb);
|
|
int res = AVERROR_EOF;
|
|
|
|
do {
|
|
ptr2 = ptr;
|
|
ptr += ff_get_line(s->pb, ptr, sizeof(buffer)+buffer-ptr);
|
|
} while (!is_eol(*ptr2) && !s->pb->eof_reached && ptr-buffer<sizeof(buffer)-1);
|
|
|
|
if (buffer[0] && !(res = av_new_packet(pkt, ptr-buffer))) {
|
|
memcpy(pkt->data, buffer, pkt->size);
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
pkt->pos = pos;
|
|
pkt->pts = pkt->dts = get_pts(pkt->data);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
AVInputFormat ff_srt_demuxer = {
|
|
.name = "srt",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle format"),
|
|
.read_probe = srt_probe,
|
|
.read_header = srt_read_header,
|
|
.read_packet = srt_read_packet,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|