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https://github.com/FFmpeg/FFmpeg.git
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1fc5d327e4
The packets muxers receive are not guaranteed to be writable, so they must not be modified. Ergo only access the packet's data via a const uint8_t*. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* SUP muxer
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* Copyright (c) 2014 Petri Hintukainen <phintuka@users.sourceforge.net>
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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/intreadwrite.h"
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#define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */
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static int sup_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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const uint8_t *data = pkt->data;
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size_t size = pkt->size;
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uint32_t pts = 0, dts = 0;
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if (pkt->pts != AV_NOPTS_VALUE) {
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pts = pkt->pts;
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}
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if (pkt->dts != AV_NOPTS_VALUE) {
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dts = pkt->dts;
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}
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/*
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Split frame to segments.
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mkvmerge stores multiple segments in one frame.
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*/
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while (size > 2) {
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size_t len = AV_RB16(data + 1) + 3;
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if (len > size) {
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av_log(s, AV_LOG_ERROR, "Not enough data, skipping %"SIZE_SPECIFIER" bytes\n",
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size);
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return AVERROR_INVALIDDATA;
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}
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/* header */
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avio_wb16(s->pb, SUP_PGS_MAGIC);
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avio_wb32(s->pb, pts);
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avio_wb32(s->pb, dts);
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avio_write(s->pb, data, len);
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data += len;
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size -= len;
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}
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if (size > 0) {
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av_log(s, AV_LOG_ERROR, "Skipping %"SIZE_SPECIFIER" bytes after last segment in frame\n",
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size);
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static int sup_write_header(AVFormatContext *s)
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{
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if (s->nb_streams != 1) {
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av_log(s, AV_LOG_ERROR, "%s files have exactly one stream\n",
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s->oformat->name);
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return AVERROR(EINVAL);
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}
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avpriv_set_pts_info(s->streams[0], 32, 1, 90000);
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return 0;
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}
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const AVOutputFormat ff_sup_muxer = {
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.name = "sup",
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.long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"),
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.extensions = "sup",
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.mime_type = "application/x-pgs",
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.subtitle_codec = AV_CODEC_ID_HDMV_PGS_SUBTITLE,
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.write_header = sup_write_header,
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.write_packet = sup_write_packet,
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.flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
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};
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