forked from FFmpeg/FFmpeg
avformat: add Scenarist Closed Captions demuxer
Fixes #4767. Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
b953aec3c4
commit
45ff6ef50e
4 changed files with 186 additions and 1 deletions
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@ -434,6 +434,7 @@ OBJS-$(CONFIG_SAMI_DEMUXER) += samidec.o subtitles.o
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OBJS-$(CONFIG_SAP_DEMUXER) += sapdec.o
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OBJS-$(CONFIG_SAP_MUXER) += sapenc.o
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OBJS-$(CONFIG_SBG_DEMUXER) += sbgdec.o
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OBJS-$(CONFIG_SCC_DEMUXER) += sccdec.o subtitles.o
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OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o
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OBJS-$(CONFIG_SDR2_DEMUXER) += sdr2.o
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OBJS-$(CONFIG_SDS_DEMUXER) += sdsdec.o
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@ -273,6 +273,7 @@ void av_register_all(void)
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REGISTER_DEMUXER (SAMI, sami);
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REGISTER_MUXDEMUX(SAP, sap);
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REGISTER_DEMUXER (SBG, sbg);
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REGISTER_DEMUXER (SCC, scc);
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REGISTER_DEMUXER (SDP, sdp);
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REGISTER_DEMUXER (SDR2, sdr2);
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REGISTER_DEMUXER (SDS, sds);
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183
libavformat/sccdec.c
Normal file
183
libavformat/sccdec.c
Normal file
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@ -0,0 +1,183 @@
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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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@ -32,7 +32,7 @@
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// Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
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// Also please add any ticket numbers that you believe might be affected here
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#define LIBAVFORMAT_VERSION_MAJOR 57
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#define LIBAVFORMAT_VERSION_MINOR 64
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#define LIBAVFORMAT_VERSION_MINOR 65
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#define LIBAVFORMAT_VERSION_MICRO 100
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#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
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