mirror of https://github.com/FFmpeg/FFmpeg.git
Fixes #4767. Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/249/head
Paul B Mahol
8 years ago
parent
b953aec3c4
commit
45ff6ef50e
4 changed files with 186 additions and 1 deletions
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/*
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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/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(AVProbeData *p) |
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{ |
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char buf[128]; |
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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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if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0) |
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return 0; |
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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 line[4096], line2[4096]; |
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int count = 0, ret = 0; |
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ptrdiff_t len2, 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)) { |
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const int64_t pos = ff_text_pos(&tr); |
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char *saveptr = NULL, *lline; |
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int hh1, mm1, ss1, fs1, i; |
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int hh2, mm2, ss2, fs2; |
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int64_t ts_start, ts_end; |
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AVPacket *sub; |
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if (count == 0) { |
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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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break; |
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} |
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} |
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if (!strncmp(line, "Scenarist_SCC V1.0", 18)) |
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continue; |
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if (sscanf(line, "%d:%d:%d:%d", &hh1, &mm1, &ss1, &fs1) != 4 && |
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sscanf(line, "%d:%d:%d;%d", &hh1, &mm1, &ss1, &fs1) != 4) |
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continue; |
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ts_start = (hh1 * 3600LL + mm1 * 60LL + ss1) * 1000LL + fs1 * 33; |
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while (!ff_text_eof(&tr)) { |
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len2 = ff_subtitles_read_line(&tr, line2, sizeof(line2)); |
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if (len2 > 13) |
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break; |
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} |
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if (sscanf(line2, "%d:%d:%d:%d", &hh2, &mm2, &ss2, &fs2) != 4 && |
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sscanf(line2, "%d:%d:%d;%d", &hh2, &mm2, &ss2, &fs2) != 4) |
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continue; |
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ts_end = (hh2 * 3600LL + mm2 * 60LL + ss2) * 1000LL + fs2 * 33; |
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count++; |
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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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if (!ptr) |
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break; |
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if (sscanf(ptr, "%c%c%c%c", &c1, &c2, &c3, &c4) != 4) |
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break; |
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lline = NULL; |
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out[i+0] = 0xfc; |
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out[i+1] = convert(c2) | (convert(c1) << 4); |
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out[i+2] = convert(c4) | (convert(c3) << 4); |
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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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return AVERROR(ENOMEM); |
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sub->pos = pos; |
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sub->pts = ts_start; |
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sub->duration = FFMAX(1200, ts_end - ts_start); |
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memmove(line, line2, sizeof(line)); |
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FFSWAP(ptrdiff_t, len, len2); |
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} |
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ff_subtitles_queue_finalize(s, &scc->q); |
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return ret; |
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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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