124 lines
3.8 KiB
C
Executable File
124 lines
3.8 KiB
C
Executable File
/*
|
|
* SCC muxer
|
|
* Copyright (c) 2017 Paul B Mahol
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "libavutil/log.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
typedef struct SCCContext {
|
|
int prev_h, prev_m, prev_s, prev_f;
|
|
int inside;
|
|
int n;
|
|
} SCCContext;
|
|
|
|
static int scc_write_header(AVFormatContext *avf)
|
|
{
|
|
SCCContext *scc = avf->priv_data;
|
|
|
|
if (avf->nb_streams != 1 ||
|
|
avf->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
|
|
av_log(avf, AV_LOG_ERROR,
|
|
"SCC supports only a single subtitles stream.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
if (avf->streams[0]->codecpar->codec_id != AV_CODEC_ID_EIA_608) {
|
|
av_log(avf, AV_LOG_ERROR,
|
|
"Unsupported subtitles codec: %s\n",
|
|
avcodec_get_name(avf->streams[0]->codecpar->codec_id));
|
|
return AVERROR(EINVAL);
|
|
}
|
|
avpriv_set_pts_info(avf->streams[0], 64, 1, 1000);
|
|
avio_printf(avf->pb, "Scenarist_SCC V1.0\n");
|
|
|
|
scc->prev_h = scc->prev_m = scc->prev_s = scc->prev_f = -1;
|
|
scc->inside = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int scc_write_packet(AVFormatContext *avf, AVPacket *pkt)
|
|
{
|
|
SCCContext *scc = avf->priv_data;
|
|
int64_t pts = pkt->pts;
|
|
int i, h, m, s, f;
|
|
|
|
if (pts == AV_NOPTS_VALUE) {
|
|
av_log(avf, AV_LOG_WARNING,
|
|
"Insufficient timestamps.\n");
|
|
return 0;
|
|
}
|
|
|
|
h = (int)(pts / (3600000));
|
|
m = (int)(pts / (60000)) % 60;
|
|
s = (int)(pts / 1000) % 60;
|
|
f = (int)(pts % 1000) / 33;
|
|
|
|
for (i = 0; i < pkt->size; i+=3) {
|
|
if (pkt->data[i] == 0xfc && ((pkt->data[i + 1] != 0x80 || pkt->data[i + 2] != 0x80)))
|
|
break;
|
|
}
|
|
if (i >= pkt->size)
|
|
return 0;
|
|
|
|
if (!scc->inside && (scc->prev_h != h || scc->prev_m != m || scc->prev_s != s || scc->prev_f != f)) {
|
|
avio_printf(avf->pb, "\n%02d:%02d:%02d:%02d\t", h, m, s, f);
|
|
scc->inside = 1;
|
|
}
|
|
for (i = 0; i < pkt->size; i+=3) {
|
|
if (i + 3 > pkt->size)
|
|
break;
|
|
|
|
if (pkt->data[i] != 0xfc || (pkt->data[i + 1] == 0x80 && pkt->data[i + 2] == 0x80))
|
|
continue;
|
|
if (!scc->inside) {
|
|
avio_printf(avf->pb, "\n%02d:%02d:%02d:%02d\t", h, m, s, f);
|
|
scc->inside = 1;
|
|
}
|
|
if (scc->n > 0)
|
|
avio_printf(avf->pb, " ");
|
|
avio_printf(avf->pb, "%02x%02x", pkt->data[i + 1], pkt->data[i + 2]);
|
|
scc->n++;
|
|
}
|
|
if (scc->inside && (scc->prev_h != h || scc->prev_m != m || scc->prev_s != s || scc->prev_f != f)) {
|
|
avio_printf(avf->pb, "\n");
|
|
scc->n = 0;
|
|
scc->inside = 0;
|
|
}
|
|
|
|
scc->prev_h = h;
|
|
scc->prev_m = m;
|
|
scc->prev_s = s;
|
|
scc->prev_f = f;
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_scc_muxer = {
|
|
.name = "scc",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Scenarist Closed Captions"),
|
|
.extensions = "scc",
|
|
.priv_data_size = sizeof(SCCContext),
|
|
.write_header = scc_write_header,
|
|
.write_packet = scc_write_packet,
|
|
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
|
|
.subtitle_codec = AV_CODEC_ID_EIA_608,
|
|
};
|