From 7a6bd541528b4d00b52d422d02f01d42346e68df Mon Sep 17 00:00:00 2001 From: Petri Hintukainen Date: Tue, 30 Sep 2014 11:01:17 +0300 Subject: Add SUP/PGS subtitle muxer Fixes ticket #2208 --- libavformat/supenc.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 libavformat/supenc.c (limited to 'libavformat/supenc.c') diff --git a/libavformat/supenc.c b/libavformat/supenc.c new file mode 100644 index 0000000000..f5f6b58c87 --- /dev/null +++ b/libavformat/supenc.c @@ -0,0 +1,96 @@ +/* + * SUP muxer + * Copyright (c) 2014 Petri Hintukainen + * + * 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/intreadwrite.h" + +#define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */ + +static int sup_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + uint8_t *data = pkt->data; + size_t size = pkt->size; + uint32_t pts = 0, dts = 0; + + if (pkt->pts != AV_NOPTS_VALUE) { + pts = (uint32_t)pkt->pts; + } + if (pkt->dts != AV_NOPTS_VALUE) { + dts = (uint32_t)pkt->dts; + } + + /* + Split frame to segments. + mkvmerge stores multiple segments in one frame. + */ + while (size > 2) { + size_t len = AV_RB16(data + 1) + 3; + + if (len > size) { + av_log(s, AV_LOG_ERROR, "Not enough data, skipping %d bytes\n", + (int)size); + return AVERROR_INVALIDDATA; + } + + /* header */ + avio_wb16(s->pb, SUP_PGS_MAGIC); + avio_wb32(s->pb, pts); + avio_wb32(s->pb, dts); + + avio_write(s->pb, data, len); + + data += len; + size -= len; + } + + if (size > 0) { + av_log(s, AV_LOG_ERROR, "Skipping %d bytes after last segment in frame\n", + (int)size); + return AVERROR_INVALIDDATA; + } + + return 0; +} + +static int sup_write_header(AVFormatContext *s) +{ + if (s->nb_streams != 1) { + av_log(s, AV_LOG_ERROR, "%s files have exactly one stream\n", + s->oformat->name); + return AVERROR(EINVAL); + } + + avpriv_set_pts_info(s->streams[0], 32, 1, 90000); + + return 0; +} + +AVOutputFormat ff_sup_muxer = { + .name = "sup", + .long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"), + .extensions = "sup", + .mime_type = "application/x-pgs", + .subtitle_codec = AV_CODEC_ID_HDMV_PGS_SUBTITLE, + .write_header = sup_write_header, + .write_packet = sup_write_packet, + .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, +}; -- cgit v1.2.1