3 * Copyright (c) 2017 Paul B Mahol
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "subtitles.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/intreadwrite.h"
28 typedef struct SCCContext {
29 FFDemuxSubtitlesQueue q;
32 static int scc_probe(AVProbeData *p)
37 ff_text_init_buf(&tr, p->buf, p->buf_size);
39 while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n')
42 ff_text_read(&tr, buf, sizeof(buf));
44 if (!memcmp(buf, "Scenarist_SCC V1.0", 18))
45 return AVPROBE_SCORE_MAX;
50 static int convert(uint8_t x)
61 static int scc_read_header(AVFormatContext *s)
63 SCCContext *scc = s->priv_data;
64 AVStream *st = avformat_new_stream(s, NULL);
65 char line[4096], line2[4096];
66 int count = 0, ret = 0;
71 ff_text_init_avio(s, &tr, s->pb);
74 return AVERROR(ENOMEM);
75 avpriv_set_pts_info(st, 64, 1, 1000);
76 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
77 st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
79 while (!ff_text_eof(&tr)) {
80 const int64_t pos = ff_text_pos(&tr);
81 char *saveptr = NULL, *lline;
82 int hh1, mm1, ss1, fs1, i;
83 int hh2, mm2, ss2, fs2;
84 int64_t ts_start, ts_end;
88 while (!ff_text_eof(&tr)) {
89 len = ff_subtitles_read_line(&tr, line, sizeof(line));
95 if (!strncmp(line, "Scenarist_SCC V1.0", 18))
97 if (sscanf(line, "%d:%d:%d%*[:;]%d", &hh1, &mm1, &ss1, &fs1) != 4)
100 ts_start = (hh1 * 3600LL + mm1 * 60LL + ss1) * 1000LL + fs1 * 33;
102 while (!ff_text_eof(&tr)) {
103 len2 = ff_subtitles_read_line(&tr, line2, sizeof(line2));
107 if (sscanf(line2, "%d:%d:%d%*[:;]%d", &hh2, &mm2, &ss2, &fs2) != 4)
110 ts_end = (hh2 * 3600LL + mm2 * 60LL + ss2) * 1000LL + fs2 * 33;
113 lline = (char *)&line;
116 for (i = 0; i < 4095; i += 3) {
117 char *ptr = av_strtok(lline, " ", &saveptr);
123 if (sscanf(ptr, "%c%c%c%c", &c1, &c2, &c3, &c4) != 4)
128 out[i+1] = convert(c2) | (convert(c1) << 4);
129 out[i+2] = convert(c4) | (convert(c3) << 4);
133 sub = ff_subtitles_queue_insert(&scc->q, out, i, 0);
135 return AVERROR(ENOMEM);
139 sub->duration = FFMAX(1200, ts_end - ts_start);
140 memmove(line, line2, sizeof(line));
141 FFSWAP(ptrdiff_t, len, len2);
144 ff_subtitles_queue_finalize(s, &scc->q);
149 static int scc_read_packet(AVFormatContext *s, AVPacket *pkt)
151 SCCContext *scc = s->priv_data;
152 return ff_subtitles_queue_read_packet(&scc->q, pkt);
155 static int scc_read_seek(AVFormatContext *s, int stream_index,
156 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
158 SCCContext *scc = s->priv_data;
159 return ff_subtitles_queue_seek(&scc->q, s, stream_index,
160 min_ts, ts, max_ts, flags);
163 static int scc_read_close(AVFormatContext *s)
165 SCCContext *scc = s->priv_data;
166 ff_subtitles_queue_clean(&scc->q);
170 AVInputFormat ff_scc_demuxer = {
172 .long_name = NULL_IF_CONFIG_SMALL("Scenarist Closed Captions"),
173 .priv_data_size = sizeof(SCCContext),
174 .read_probe = scc_probe,
175 .read_header = scc_read_header,
176 .read_packet = scc_read_packet,
177 .read_seek2 = scc_read_seek,
178 .read_close = scc_read_close,