215 lines
5.9 KiB
C
Executable File
215 lines
5.9 KiB
C
Executable File
/*
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* SCC subtitle demuxer
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* Copyright (c) 2017 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 SCCContext {
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FFDemuxSubtitlesQueue q;
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} SCCContext;
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static int scc_probe(const AVProbeData *p)
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{
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char buf[18];
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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, "Scenarist_SCC V1.0", 18))
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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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static int scc_read_header(AVFormatContext *s)
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{
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SCCContext *scc = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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char line2[4096], line[4096];
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int64_t pos, ts, next_ts = AV_NOPTS_VALUE;
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ptrdiff_t len;
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uint8_t out[4096];
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FFTextReader tr;
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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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avpriv_set_pts_info(st, 64, 1, 1000);
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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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while (!ff_text_eof(&tr) || next_ts == AV_NOPTS_VALUE || line2[0]) {
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char *saveptr = NULL, *lline;
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int hh, mm, ss, fs, i;
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AVPacket *sub;
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if (next_ts == AV_NOPTS_VALUE) {
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while (!ff_text_eof(&tr)) {
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len = ff_subtitles_read_line(&tr, line, sizeof(line));
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if (len <= 13)
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continue;
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if (!strncmp(line, "Scenarist_SCC V1.0", 18))
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continue;
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if (av_sscanf(line, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) == 4)
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break;
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}
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ts = (hh * 3600LL + mm * 60LL + ss) * 1000LL + fs * 33;
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while (!ff_text_eof(&tr)) {
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len = ff_subtitles_read_line(&tr, line2, sizeof(line2));
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if (len <= 13)
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continue;
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if (av_sscanf(line2, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) == 4)
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break;
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}
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} else {
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memmove(line, line2, sizeof(line));
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line2[0] = 0;
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while (!ff_text_eof(&tr)) {
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len = ff_subtitles_read_line(&tr, line2, sizeof(line2));
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if (len <= 13)
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continue;
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if (av_sscanf(line2, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) == 4)
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break;
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}
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}
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next_ts = (hh * 3600LL + mm * 60LL + ss) * 1000LL + fs * 33;
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pos = ff_text_pos(&tr);
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lline = (char *)&line;
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lline += 12;
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for (i = 0; i < 4095; i += 3) {
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char *ptr = av_strtok(lline, " ", &saveptr);
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char c1, c2, c3, c4;
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uint8_t o1, o2;
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if (!ptr)
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break;
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if (av_sscanf(ptr, "%c%c%c%c", &c1, &c2, &c3, &c4) != 4)
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break;
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o1 = convert(c2) | (convert(c1) << 4);
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o2 = convert(c4) | (convert(c3) << 4);
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lline = NULL;
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if (i > 12 && o1 == 0x94 && o2 == 0x20 && saveptr &&
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(av_strncasecmp(saveptr, "942f", 4) && !av_strncasecmp(saveptr, "942c", 4))) {
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out[i] = 0;
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sub = ff_subtitles_queue_insert(&scc->q, out, i, 0);
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if (!sub)
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goto fail;
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sub->pos = pos;
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pos += i;
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sub->pts = ts;
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sub->duration = i * 11;
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ts += sub->duration;
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i = 0;
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}
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out[i+0] = 0xfc;
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out[i+1] = o1;
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out[i+2] = o2;
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}
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out[i] = 0;
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sub = ff_subtitles_queue_insert(&scc->q, out, i, 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 = next_ts - ts;
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ts = next_ts;
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}
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ff_subtitles_queue_finalize(s, &scc->q);
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return 0;
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fail:
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ff_subtitles_queue_clean(&scc->q);
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return AVERROR(ENOMEM);
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}
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static int scc_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SCCContext *scc = s->priv_data;
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return ff_subtitles_queue_read_packet(&scc->q, pkt);
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}
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static int scc_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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SCCContext *scc = s->priv_data;
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return ff_subtitles_queue_seek(&scc->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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static int scc_read_close(AVFormatContext *s)
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{
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SCCContext *scc = s->priv_data;
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ff_subtitles_queue_clean(&scc->q);
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return 0;
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}
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AVInputFormat ff_scc_demuxer = {
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.name = "scc",
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.long_name = NULL_IF_CONFIG_SMALL("Scenarist Closed Captions"),
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.priv_data_size = sizeof(SCCContext),
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.read_probe = scc_probe,
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.read_header = scc_read_header,
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.read_packet = scc_read_packet,
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.read_seek2 = scc_read_seek,
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.read_close = scc_read_close,
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.extensions = "scc",
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};
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