2 * Copyright (c) 2012 Clément Bœsch
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * SAMI subtitle decoder
24 * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
28 #include "libavutil/avstring.h"
29 #include "libavutil/bprint.h"
37 static int sami_paragraph_to_ass(AVCodecContext
*avctx
, const char *src
)
39 SAMIContext
*sami
= avctx
->priv_data
;
42 char *dupsrc
= av_strdup(src
);
45 av_bprint_clear(&sami
->content
);
48 int prev_chr_is_space
= 0;
49 AVBPrint
*dst
= &sami
->content
;
51 /* parse & extract paragraph tag */
52 p
= av_stristr(p
, "<P");
55 if (p
[2] != '>' && !av_isspace(p
[2])) { // avoid confusion with tags such as <PRE>
59 if (dst
->len
) // add a separator with the previous paragraph if there was one
60 av_bprintf(dst
, "\\N");
61 tag
= av_strtok(p
, ">", &saveptr
);
66 /* check if the current paragraph is the "source" (speaker name) */
67 if (av_stristr(tag
, "ID=Source") || av_stristr(tag
, "ID=\"Source\"")) {
72 /* if empty event -> skip subtitle */
73 while (av_isspace(*p
))
75 if (!strncmp(p
, " ", 6)) {
80 /* extract the text, stripping most of the tags */
83 if (!av_strncasecmp(p
, "<P", 2) && (p
[2] == '>' || av_isspace(p
[2])))
85 if (!av_strncasecmp(p
, "<BR", 3))
86 av_bprintf(dst
, "\\N");
88 while (*p
&& *p
!= '>')
96 av_bprint_chars(dst
, *p
, 1);
97 else if (!prev_chr_is_space
)
98 av_bprint_chars(dst
, ' ', 1);
99 prev_chr_is_space
= av_isspace(*p
);
104 av_bprint_clear(&sami
->full
);
105 if (sami
->source
.len
)
106 av_bprintf(&sami
->full
, "{\\i1}%s{\\i0}\\N", sami
->source
.str
);
107 av_bprintf(&sami
->full
, "%s", sami
->content
.str
);
114 static int sami_decode_frame(AVCodecContext
*avctx
,
115 void *data
, int *got_sub_ptr
, AVPacket
*avpkt
)
117 AVSubtitle
*sub
= data
;
118 const char *ptr
= avpkt
->data
;
119 SAMIContext
*sami
= avctx
->priv_data
;
121 if (ptr
&& avpkt
->size
> 0 && !sami_paragraph_to_ass(avctx
, ptr
)) {
122 int ts_start
= av_rescale_q(avpkt
->pts
, avctx
->time_base
, (AVRational
){1,100});
123 int ts_duration
= avpkt
->duration
!= -1 ?
124 av_rescale_q(avpkt
->duration
, avctx
->time_base
, (AVRational
){1,100}) : -1;
125 int ret
= ff_ass_add_rect_bprint(sub
, &sami
->full
, ts_start
, ts_duration
);
129 *got_sub_ptr
= sub
->num_rects
> 0;
133 static av_cold
int sami_init(AVCodecContext
*avctx
)
135 SAMIContext
*sami
= avctx
->priv_data
;
136 av_bprint_init(&sami
->source
, 0, 2048);
137 av_bprint_init(&sami
->content
, 0, 2048);
138 av_bprint_init(&sami
->full
, 0, 2048);
139 return ff_ass_subtitle_header_default(avctx
);
142 static av_cold
int sami_close(AVCodecContext
*avctx
)
144 SAMIContext
*sami
= avctx
->priv_data
;
145 av_bprint_finalize(&sami
->source
, NULL
);
146 av_bprint_finalize(&sami
->content
, NULL
);
147 av_bprint_finalize(&sami
->full
, NULL
);
151 AVCodec ff_sami_decoder
= {
153 .long_name
= NULL_IF_CONFIG_SMALL("SAMI subtitle"),
154 .type
= AVMEDIA_TYPE_SUBTITLE
,
155 .id
= AV_CODEC_ID_SAMI
,
156 .priv_data_size
= sizeof(SAMIContext
),
159 .decode
= sami_decode_frame
,