mirror of
https://git.ffmpeg.org/ffmpeg.git
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124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/*
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* SCC muxer
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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 "libavutil/log.h"
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#include "libavutil/intreadwrite.h"
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typedef struct SCCContext {
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int prev_h, prev_m, prev_s, prev_f;
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int inside;
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int n;
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} SCCContext;
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static int scc_write_header(AVFormatContext *avf)
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{
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SCCContext *scc = avf->priv_data;
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if (avf->nb_streams != 1 ||
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avf->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
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av_log(avf, AV_LOG_ERROR,
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"SCC supports only a single subtitles stream.\n");
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return AVERROR(EINVAL);
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}
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if (avf->streams[0]->codecpar->codec_id != AV_CODEC_ID_EIA_608) {
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av_log(avf, AV_LOG_ERROR,
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"Unsupported subtitles codec: %s\n",
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avcodec_get_name(avf->streams[0]->codecpar->codec_id));
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return AVERROR(EINVAL);
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}
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avpriv_set_pts_info(avf->streams[0], 64, 1, 1000);
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avio_printf(avf->pb, "Scenarist_SCC V1.0\n");
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scc->prev_h = scc->prev_m = scc->prev_s = scc->prev_f = -1;
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scc->inside = 0;
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return 0;
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}
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static int scc_write_packet(AVFormatContext *avf, AVPacket *pkt)
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{
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SCCContext *scc = avf->priv_data;
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int64_t pts = pkt->pts;
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int i, h, m, s, f;
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if (pts == AV_NOPTS_VALUE) {
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av_log(avf, AV_LOG_WARNING,
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"Insufficient timestamps.\n");
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return 0;
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}
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h = (int)(pts / (3600000));
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m = (int)(pts / (60000)) % 60;
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s = (int)(pts / 1000) % 60;
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f = (int)(pts % 1000) / 33;
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for (i = 0; i < pkt->size - 2; i+=3) {
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if (pkt->data[i] == 0xfc && ((pkt->data[i + 1] != 0x80 || pkt->data[i + 2] != 0x80)))
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break;
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}
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if (i >= pkt->size - 2)
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return 0;
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if (!scc->inside && (scc->prev_h != h || scc->prev_m != m || scc->prev_s != s || scc->prev_f != f)) {
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avio_printf(avf->pb, "\n%02d:%02d:%02d:%02d\t", h, m, s, f);
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scc->inside = 1;
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}
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for (i = 0; i < pkt->size; i+=3) {
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if (i + 3 > pkt->size)
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break;
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if (pkt->data[i] != 0xfc || (pkt->data[i + 1] == 0x80 && pkt->data[i + 2] == 0x80))
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continue;
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if (!scc->inside) {
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avio_printf(avf->pb, "\n%02d:%02d:%02d:%02d\t", h, m, s, f);
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scc->inside = 1;
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}
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if (scc->n > 0)
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avio_w8(avf->pb, ' ');
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avio_printf(avf->pb, "%02x%02x", pkt->data[i + 1], pkt->data[i + 2]);
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scc->n++;
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}
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if (scc->inside && (scc->prev_h != h || scc->prev_m != m || scc->prev_s != s || scc->prev_f != f)) {
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avio_w8(avf->pb, '\n');
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scc->n = 0;
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scc->inside = 0;
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}
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scc->prev_h = h;
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scc->prev_m = m;
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scc->prev_s = s;
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scc->prev_f = f;
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return 0;
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}
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const AVOutputFormat ff_scc_muxer = {
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.name = "scc",
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.long_name = NULL_IF_CONFIG_SMALL("Scenarist Closed Captions"),
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.extensions = "scc",
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.priv_data_size = sizeof(SCCContext),
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.write_header = scc_write_header,
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.write_packet = scc_write_packet,
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.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
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.subtitle_codec = AV_CODEC_ID_EIA_608,
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};
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