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Original file line number | Diff line number | Diff line change |
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/* | ||
* SubRip subtitle demuxer | ||
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> | ||
* | ||
* 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 | ||
*/ | ||
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||
#include "avformat.h" | ||
#include "internal.h" | ||
#include "libavutil/intreadwrite.h" | ||
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static int srt_probe(AVProbeData *p) | ||
{ | ||
unsigned char *ptr = p->buf; | ||
int i, v, num = 0; | ||
|
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if (AV_RB24(ptr) == 0xEFBBBF) | ||
ptr += 3; /* skip UTF-8 BOM */ | ||
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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; | ||
} | ||
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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; | ||
} | ||
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static int64_t get_pts(const char *buf) | ||
{ | ||
int i, v, hour, min, sec, hsec; | ||
|
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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; | ||
} | ||
|
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static inline int is_eol(char c) | ||
{ | ||
return c == '\r' || c == '\n'; | ||
} | ||
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static int srt_read_packet(AVFormatContext *s, AVPacket *pkt) | ||
{ | ||
char buffer[2048], *ptr = buffer, *ptr2; | ||
int64_t pos = url_ftell(s->pb); | ||
int res = AVERROR_EOF; | ||
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do { | ||
ptr2 = ptr; | ||
ptr += ff_get_line(s->pb, ptr, sizeof(buffer)+buffer-ptr); | ||
} while (!is_eol(*ptr2) && !url_feof(s->pb) && ptr-buffer<sizeof(buffer)-1); | ||
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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; | ||
} | ||
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AVInputFormat 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, | ||
}; |