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 be 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(&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,