1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* Copyright (c) 2012 Clément Bœsch
*
* 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
* SubViewer subtitle decoder
* @see https://en.wikipedia.org/wiki/SubViewer
*/
#include "avcodec.h"
#include "ass.h"
#include "libavutil/bprint.h"
static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
{
while (*p) {
if (!strncmp(p, "[br]", 4)) {
av_bprintf(buf, "\\N");
p += 4;
} else {
if (p[0] == '\n' && p[1])
av_bprintf(buf, "\\N");
else if (*p != '\n' && *p != '\r')
av_bprint_chars(buf, *p, 1);
p++;
}
}
av_bprintf(buf, "\r\n");
return 0;
}
static int subviewer_decode_frame(AVCodecContext *avctx,
void *data, int *got_sub_ptr, AVPacket *avpkt)
{
char c;
AVSubtitle *sub = data;
const char *ptr = avpkt->data;
AVBPrint buf;
/* To be removed later */
if (ptr && sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) {
av_log(avctx, AV_LOG_ERROR, "AVPacket is not clean (contains timing "
"information). You need to upgrade your libavformat or "
"sanitize your packet.\n");
return AVERROR_INVALIDDATA;
}
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
// note: no need to rescale pts & duration since they are in the same
// timebase as ASS (1/100)
if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0);
*got_sub_ptr = sub->num_rects > 0;
av_bprint_finalize(&buf, NULL);
return avpkt->size;
}
AVCodec ff_subviewer_decoder = {
.name = "subviewer",
.long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_SUBVIEWER,
.decode = subviewer_decode_frame,
.init = ff_ass_subtitle_header_default,
};
|
