mirror of
https://git.ffmpeg.org/ffmpeg.git
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215 lines
6.5 KiB
C
215 lines
6.5 KiB
C
/*
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* MCC subtitle demuxer
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* Copyright (c) 2020 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/intreadwrite.h"
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typedef struct MCCContext {
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FFDemuxSubtitlesQueue q;
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} MCCContext;
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static int mcc_probe(const AVProbeData *p)
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{
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char buf[28];
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FFTextReader tr;
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ff_text_init_buf(&tr, p->buf, p->buf_size);
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while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n')
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ff_text_r8(&tr);
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ff_text_read(&tr, buf, sizeof(buf));
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if (!memcmp(buf, "File Format=MacCaption_MCC V", 28))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int convert(uint8_t x)
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{
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if (x >= 'a')
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x -= 87;
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else if (x >= 'A')
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x -= 55;
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else
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x -= '0';
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return x;
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}
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typedef struct alias {
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uint8_t key;
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int len;
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const char *value;
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} alias;
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static const alias aliases[20] = {
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{ .key = 16, .len = 3, .value = "\xFA\x0\x0", },
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{ .key = 17, .len = 6, .value = "\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 18, .len = 9, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 19, .len = 12, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 20, .len = 15, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 21, .len = 18, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .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", },
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{ .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", },
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{ .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", },
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{ .key = 25, .len = 3, .value = "\xFB\x80\x80", },
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{ .key = 26, .len = 3, .value = "\xFC\x80\x80", },
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{ .key = 27, .len = 3, .value = "\xFD\x80\x80", },
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{ .key = 28, .len = 2, .value = "\x96\x69", },
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{ .key = 29, .len = 2, .value = "\x61\x01", },
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{ .key = 30, .len = 3, .value = "\xFC\x80\x80", },
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{ .key = 31, .len = 3, .value = "\xFC\x80\x80", },
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{ .key = 32, .len = 4, .value = "\xE1\x00\x00\x00", },
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{ .key = 33, .len = 0, .value = NULL, },
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{ .key = 34, .len = 0, .value = NULL, },
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{ .key = 35, .len = 1, .value = "\x0", },
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};
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static int mcc_read_header(AVFormatContext *s)
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{
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MCCContext *mcc = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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AVRational rate;
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int64_t ts, pos;
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uint8_t out[4096];
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char line[4096];
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FFTextReader tr;
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int ret = 0;
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ff_text_init_avio(s, &tr, s->pb);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
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avpriv_set_pts_info(st, 64, 1, 30);
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while (!ff_text_eof(&tr)) {
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int hh, mm, ss, fs, i = 0, j = 0;
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int start = 12, count = 0;
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AVPacket *sub;
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char *lline;
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ff_subtitles_read_line(&tr, line, sizeof(line));
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if (!strncmp(line, "File Format=MacCaption_MCC V", 28))
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continue;
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if (!strncmp(line, "//", 2))
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continue;
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if (!strncmp(line, "Time Code Rate=", 15)) {
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char *rate_str = line + 15;
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char *df = NULL;
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int num = -1, den = -1;
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if (rate_str[0]) {
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num = strtol(rate_str, &df, 10);
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den = 1;
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if (df && !av_strncasecmp(df, "DF", 2)) {
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av_reduce(&num, &den, num * 1000LL, 1001, INT_MAX);
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}
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}
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if (num > 0 && den > 0) {
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rate = av_make_q(num, den);
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avpriv_set_pts_info(st, 64, rate.den, rate.num);
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}
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continue;
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}
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if (av_sscanf(line, "%d:%d:%d:%d", &hh, &mm, &ss, &fs) != 4)
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continue;
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ts = av_sat_add64(av_rescale(hh * 3600LL + mm * 60LL + ss, rate.num, rate.den), fs);
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lline = (char *)&line;
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lline += 12;
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pos = ff_text_pos(&tr);
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while (lline[i]) {
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uint8_t v = convert(lline[i]);
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if (v >= 16 && v <= 35) {
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int idx = v - 16;
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if (aliases[idx].len) {
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if (j >= sizeof(out) - 1 - aliases[idx].len) {
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j = 0;
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break;
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}
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memcpy(out + j, aliases[idx].value, aliases[idx].len);
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j += aliases[idx].len;
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}
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} else {
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uint8_t vv;
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if (i + 13 >= sizeof(line) - 1)
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break;
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vv = convert(lline[i + 1]);
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if (j >= sizeof(out) - 1) {
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j = 0;
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break;
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}
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out[j++] = vv | (v << 4);
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i++;
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}
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i++;
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}
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out[j] = 0;
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if (out[7] & 0x80)
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start += 4;
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count = (out[11] & 0x1f) * 3;
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if (j < start + count + 1)
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continue;
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if (!count)
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continue;
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sub = ff_subtitles_queue_insert(&mcc->q, out + start, count, 0);
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if (!sub)
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return AVERROR(ENOMEM);
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sub->pos = pos;
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sub->pts = ts;
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sub->duration = 1;
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}
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ff_subtitles_queue_finalize(s, &mcc->q);
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return ret;
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}
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const AVInputFormat ff_mcc_demuxer = {
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.name = "mcc",
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.long_name = NULL_IF_CONFIG_SMALL("MacCaption"),
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.priv_data_size = sizeof(MCCContext),
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.flags_internal = FF_FMT_INIT_CLEANUP,
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.read_probe = mcc_probe,
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.read_header = mcc_read_header,
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.extensions = "mcc",
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.read_packet = ff_subtitles_read_packet,
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.read_seek2 = ff_subtitles_read_seek,
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.read_close = ff_subtitles_read_close,
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};
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