1/* 2 * SUP muxer 3 * Copyright (c) 2014 Petri Hintukainen <phintuka@users.sourceforge.net> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "avformat.h" 23#include "internal.h" 24#include "libavutil/intreadwrite.h" 25 26#define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */ 27 28static int sup_write_packet(AVFormatContext *s, AVPacket *pkt) 29{ 30 const uint8_t *data = pkt->data; 31 size_t size = pkt->size; 32 uint32_t pts = 0, dts = 0; 33 34 if (pkt->pts != AV_NOPTS_VALUE) { 35 pts = pkt->pts; 36 } 37 if (pkt->dts != AV_NOPTS_VALUE) { 38 dts = pkt->dts; 39 } 40 41 /* 42 Split frame to segments. 43 mkvmerge stores multiple segments in one frame. 44 */ 45 while (size > 2) { 46 size_t len = AV_RB16(data + 1) + 3; 47 48 if (len > size) { 49 av_log(s, AV_LOG_ERROR, "Not enough data, skipping %"SIZE_SPECIFIER" bytes\n", 50 size); 51 return AVERROR_INVALIDDATA; 52 } 53 54 /* header */ 55 avio_wb16(s->pb, SUP_PGS_MAGIC); 56 avio_wb32(s->pb, pts); 57 avio_wb32(s->pb, dts); 58 59 avio_write(s->pb, data, len); 60 61 data += len; 62 size -= len; 63 } 64 65 if (size > 0) { 66 av_log(s, AV_LOG_ERROR, "Skipping %"SIZE_SPECIFIER" bytes after last segment in frame\n", 67 size); 68 return AVERROR_INVALIDDATA; 69 } 70 71 return 0; 72} 73 74static int sup_write_header(AVFormatContext *s) 75{ 76 if (s->nb_streams != 1) { 77 av_log(s, AV_LOG_ERROR, "%s files have exactly one stream\n", 78 s->oformat->name); 79 return AVERROR(EINVAL); 80 } 81 82 avpriv_set_pts_info(s->streams[0], 32, 1, 90000); 83 84 return 0; 85} 86 87const AVOutputFormat ff_sup_muxer = { 88 .name = "sup", 89 .long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"), 90 .extensions = "sup", 91 .mime_type = "application/x-pgs", 92 .subtitle_codec = AV_CODEC_ID_HDMV_PGS_SUBTITLE, 93 .write_header = sup_write_header, 94 .write_packet = sup_write_packet, 95 .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, 96}; 97