mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
4 years ago
parent
b52ca2cec2
commit
71f19bf5e3
5 changed files with 243 additions and 2 deletions
@ -0,0 +1,238 @@ |
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/*
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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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num *= 1000; |
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den = 1001; |
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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_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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goto fail; |
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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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fail: |
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ff_subtitles_queue_clean(&mcc->q); |
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return AVERROR(ENOMEM); |
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} |
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static int mcc_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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MCCContext *mcc = s->priv_data; |
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return ff_subtitles_queue_read_packet(&mcc->q, pkt); |
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} |
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static int mcc_read_seek(AVFormatContext *s, int stream_index, |
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
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{ |
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MCCContext *mcc = s->priv_data; |
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return ff_subtitles_queue_seek(&mcc->q, s, stream_index, |
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min_ts, ts, max_ts, flags); |
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} |
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static int mcc_read_close(AVFormatContext *s) |
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{ |
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MCCContext *mcc = s->priv_data; |
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ff_subtitles_queue_clean(&mcc->q); |
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return 0; |
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} |
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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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.read_probe = mcc_probe, |
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.read_header = mcc_read_header, |
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.read_packet = mcc_read_packet, |
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.read_seek2 = mcc_read_seek, |
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.read_close = mcc_read_close, |
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.extensions = "mcc", |
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}; |
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