3 * Copyright (c) 2008 Michael Niedermayer
4 * Copyright (c) 2014 Clément Bœsch
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "subtitles.h"
28 #include "libavcodec/internal.h"
29 #include "libavutil/bprint.h"
31 typedef struct ASSContext
{
32 FFDemuxSubtitlesQueue q
;
36 static int ass_probe(AVProbeData
*p
)
40 ff_text_init_buf(&tr
, p
->buf
, p
->buf_size
);
42 ff_text_read(&tr
, buf
, sizeof(buf
));
44 if (!memcmp(buf
, "[Script Info]", 13))
45 return AVPROBE_SCORE_MAX
;
50 static int ass_read_close(AVFormatContext
*s
)
52 ASSContext
*ass
= s
->priv_data
;
53 ff_subtitles_queue_clean(&ass
->q
);
57 static int read_dialogue(ASSContext
*ass
, AVBPrint
*dst
, const uint8_t *p
,
58 int64_t *start
, int *duration
)
62 int hh1
, mm1
, ss1
, ms1
;
63 int hh2
, mm2
, ss2
, ms2
;
65 if (sscanf(p
, "Dialogue: %*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d,%n",
66 &hh1
, &mm1
, &ss1
, &ms1
,
67 &hh2
, &mm2
, &ss2
, &ms2
, &pos
) >= 8 && pos
> 0) {
69 /* This is not part of the sscanf itself in order to handle an actual
70 * number (which would be the Layer) or the form "Marked=N" (which is
71 * the old SSA field, now replaced by Layer, and will lead to Layer
73 const int layer
= atoi(p
+ 10);
75 end
= (hh2
*3600LL + mm2
*60LL + ss2
) * 100LL + ms2
;
76 *start
= (hh1
*3600LL + mm1
*60LL + ss1
) * 100LL + ms1
;
77 *duration
= end
- *start
;
80 av_bprintf(dst
, "%u,%d,%s", ass
->readorder
++, layer
, p
+ pos
);
82 /* right strip the buffer */
83 while (dst
->len
> 0 &&
84 dst
->str
[dst
->len
- 1] == '\r' ||
85 dst
->str
[dst
->len
- 1] == '\n')
86 dst
->str
[--dst
->len
] = 0;
92 static int64_t get_line(AVBPrint
*buf
, FFTextReader
*tr
)
94 int64_t pos
= ff_text_pos(tr
);
98 char c
= ff_text_r8(tr
);
101 av_bprint_chars(buf
, c
, 1);
108 static int ass_read_header(AVFormatContext
*s
)
110 ASSContext
*ass
= s
->priv_data
;
111 AVBPrint header
, line
, rline
;
115 ff_text_init_avio(s
, &tr
, s
->pb
);
117 st
= avformat_new_stream(s
, NULL
);
119 return AVERROR(ENOMEM
);
120 avpriv_set_pts_info(st
, 64, 1, 100);
121 st
->codec
->codec_type
= AVMEDIA_TYPE_SUBTITLE
;
122 st
->codec
->codec_id
= AV_CODEC_ID_ASS
;
124 av_bprint_init(&header
, 0, AV_BPRINT_SIZE_UNLIMITED
);
125 av_bprint_init(&line
, 0, AV_BPRINT_SIZE_UNLIMITED
);
126 av_bprint_init(&rline
, 0, AV_BPRINT_SIZE_UNLIMITED
);
129 int64_t pos
= get_line(&line
, &tr
);
130 int64_t ts_start
= AV_NOPTS_VALUE
;
134 if (!line
.str
[0]) // EOF
137 if (read_dialogue(ass
, &rline
, line
.str
, &ts_start
, &duration
) < 0) {
138 av_bprintf(&header
, "%s", line
.str
);
141 sub
= ff_subtitles_queue_insert(&ass
->q
, rline
.str
, rline
.len
, 0);
143 res
= AVERROR(ENOMEM
);
148 sub
->duration
= duration
;
151 res
= avpriv_bprint_to_extradata(st
->codec
, &header
);
155 ff_subtitles_queue_finalize(&ass
->q
);
158 av_bprint_finalize(&header
, NULL
);
159 av_bprint_finalize(&line
, NULL
);
160 av_bprint_finalize(&rline
, NULL
);
164 static int ass_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
166 ASSContext
*ass
= s
->priv_data
;
167 return ff_subtitles_queue_read_packet(&ass
->q
, pkt
);
170 static int ass_read_seek(AVFormatContext
*s
, int stream_index
,
171 int64_t min_ts
, int64_t ts
, int64_t max_ts
, int flags
)
173 ASSContext
*ass
= s
->priv_data
;
174 return ff_subtitles_queue_seek(&ass
->q
, s
, stream_index
,
175 min_ts
, ts
, max_ts
, flags
);
178 AVInputFormat ff_ass_demuxer
= {
180 .long_name
= NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
181 .priv_data_size
= sizeof(ASSContext
),
182 .read_probe
= ass_probe
,
183 .read_header
= ass_read_header
,
184 .read_packet
= ass_read_packet
,
185 .read_close
= ass_read_close
,
186 .read_seek2
= ass_read_seek
,