3 * Copyright (c) 2020 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/avstring.h"
26 #include "libavutil/bprint.h"
27 #include "libavutil/intreadwrite.h"
29 typedef struct MCCContext {
30 FFDemuxSubtitlesQueue q;
33 static int mcc_probe(const AVProbeData *p)
38 ff_text_init_buf(&tr, p->buf, p->buf_size);
40 while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n')
43 ff_text_read(&tr, buf, sizeof(buf));
45 if (!memcmp(buf, "File Format=MacCaption_MCC V", 28))
46 return AVPROBE_SCORE_MAX;
51 static int convert(uint8_t x)
62 typedef struct alias {
68 static const alias aliases[20] = {
69 { .key = 16, .len = 3, .value = "\xFA\x0\x0", },
70 { .key = 17, .len = 6, .value = "\xFA\x0\x0\xFA\x0\x0", },
71 { .key = 18, .len = 9, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
72 { .key = 19, .len = 12, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
73 { .key = 20, .len = 15, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
74 { .key = 21, .len = 18, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
75 { .key = 22, .len = 21, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
76 { .key = 23, .len = 24, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
77 { .key = 24, .len = 27, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
78 { .key = 25, .len = 3, .value = "\xFB\x80\x80", },
79 { .key = 26, .len = 3, .value = "\xFC\x80\x80", },
80 { .key = 27, .len = 3, .value = "\xFD\x80\x80", },
81 { .key = 28, .len = 2, .value = "\x96\x69", },
82 { .key = 29, .len = 2, .value = "\x61\x01", },
83 { .key = 30, .len = 3, .value = "\xFC\x80\x80", },
84 { .key = 31, .len = 3, .value = "\xFC\x80\x80", },
85 { .key = 32, .len = 4, .value = "\xE1\x00\x00\x00", },
86 { .key = 33, .len = 0, .value = NULL, },
87 { .key = 34, .len = 0, .value = NULL, },
88 { .key = 35, .len = 1, .value = "\x0", },
91 static int mcc_read_header(AVFormatContext *s)
93 MCCContext *mcc = s->priv_data;
94 AVStream *st = avformat_new_stream(s, NULL);
102 ff_text_init_avio(s, &tr, s->pb);
105 return AVERROR(ENOMEM);
106 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
107 st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
108 avpriv_set_pts_info(st, 64, 1, 30);
110 while (!ff_text_eof(&tr)) {
111 int hh, mm, ss, fs, i = 0, j = 0;
112 int start = 12, count = 0;
116 ff_subtitles_read_line(&tr, line, sizeof(line));
117 if (!strncmp(line, "File Format=MacCaption_MCC V", 28))
119 if (!strncmp(line, "//", 2))
121 if (!strncmp(line, "Time Code Rate=", 15)) {
122 char *rate_str = line + 15;
124 int num = -1, den = -1;
127 num = strtol(rate_str, &df, 10);
129 if (df && !av_strncasecmp(df, "DF", 2)) {
135 if (num > 0 && den > 0) {
136 rate = av_make_q(num, den);
137 avpriv_set_pts_info(st, 64, rate.den, rate.num);
142 if (av_sscanf(line, "%d:%d:%d:%d", &hh, &mm, &ss, &fs) != 4)
145 ts = av_rescale(hh * 3600LL + mm * 60LL + ss, rate.num, rate.den) + fs;
147 lline = (char *)&line;
149 pos = ff_text_pos(&tr);
152 uint8_t v = convert(lline[i]);
154 if (v >= 16 && v <= 35) {
156 if (aliases[idx].len) {
157 if (j >= sizeof(out) - 1 - aliases[idx].len) {
161 memcpy(out + j, aliases[idx].value, aliases[idx].len);
162 j += aliases[idx].len;
167 if (i + 13 >= sizeof(line) - 1)
169 vv = convert(lline[i + 1]);
170 if (j >= sizeof(out) - 1) {
174 out[j++] = vv | (v << 4);
184 count = (out[11] & 0x1f) * 3;
185 if (j < start + count + 1)
190 sub = ff_subtitles_queue_insert(&mcc->q, out + start, count, 0);
199 ff_subtitles_queue_finalize(s, &mcc->q);
203 ff_subtitles_queue_clean(&mcc->q);
204 return AVERROR(ENOMEM);
207 static int mcc_read_packet(AVFormatContext *s, AVPacket *pkt)
209 MCCContext *mcc = s->priv_data;
210 return ff_subtitles_queue_read_packet(&mcc->q, pkt);
213 static int mcc_read_seek(AVFormatContext *s, int stream_index,
214 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
216 MCCContext *mcc = s->priv_data;
217 return ff_subtitles_queue_seek(&mcc->q, s, stream_index,
218 min_ts, ts, max_ts, flags);
221 static int mcc_read_close(AVFormatContext *s)
223 MCCContext *mcc = s->priv_data;
224 ff_subtitles_queue_clean(&mcc->q);
228 AVInputFormat ff_mcc_demuxer = {
230 .long_name = NULL_IF_CONFIG_SMALL("MacCaption"),
231 .priv_data_size = sizeof(MCCContext),
232 .read_probe = mcc_probe,
233 .read_header = mcc_read_header,
234 .read_packet = mcc_read_packet,
235 .read_seek2 = mcc_read_seek,
236 .read_close = mcc_read_close,