From 036e12b225b2869861d1449534dec94bd491559e Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Fri, 27 Jan 2017 13:58:11 +0100 Subject: avformat: add SCC muxer Signed-off-by: Paul B Mahol --- libavformat/sccenc.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 libavformat/sccenc.c (limited to 'libavformat/sccenc.c') diff --git a/libavformat/sccenc.c b/libavformat/sccenc.c new file mode 100644 index 0000000000..f3cf3d599c --- /dev/null +++ b/libavformat/sccenc.c @@ -0,0 +1,123 @@ +/* + * 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, +}; -- cgit v1.2.3