1/* 2 * Metadata muxer 3 * Copyright (c) 2010 Anton Khirnov 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <inttypes.h> 23 24#include "avformat.h" 25#include "ffmeta.h" 26#include "libavutil/dict.h" 27 28 29static void write_escape_str(AVIOContext *s, const uint8_t *str) 30{ 31 const uint8_t *p = str; 32 33 while (*p) { 34 if (*p == '#' || *p == ';' || *p == '=' || *p == '\\' || *p == '\n') 35 avio_w8(s, '\\'); 36 avio_w8(s, *p); 37 p++; 38 } 39} 40 41static void write_tags(AVIOContext *s, AVDictionary *m) 42{ 43 AVDictionaryEntry *t = NULL; 44 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) { 45 write_escape_str(s, t->key); 46 avio_w8(s, '='); 47 write_escape_str(s, t->value); 48 avio_w8(s, '\n'); 49 } 50} 51 52static int write_header(AVFormatContext *s) 53{ 54 avio_write(s->pb, ID_STRING, sizeof(ID_STRING) - 1); 55 avio_w8(s->pb, '1'); // version 56 avio_w8(s->pb, '\n'); 57 avio_flush(s->pb); 58 return 0; 59} 60 61static int write_trailer(AVFormatContext *s) 62{ 63 int i; 64 65 write_tags(s->pb, s->metadata); 66 67 for (i = 0; i < s->nb_streams; i++) { 68 avio_write(s->pb, ID_STREAM, sizeof(ID_STREAM) - 1); 69 avio_w8(s->pb, '\n'); 70 write_tags(s->pb, s->streams[i]->metadata); 71 } 72 73 for (i = 0; i < s->nb_chapters; i++) { 74 AVChapter *ch = s->chapters[i]; 75 avio_write(s->pb, ID_CHAPTER, sizeof(ID_CHAPTER) - 1); 76 avio_w8(s->pb, '\n'); 77 avio_printf(s->pb, "TIMEBASE=%d/%d\n", ch->time_base.num, ch->time_base.den); 78 avio_printf(s->pb, "START=%"PRId64"\n", ch->start); 79 avio_printf(s->pb, "END=%"PRId64"\n", ch->end); 80 write_tags(s->pb, ch->metadata); 81 } 82 83 avio_flush(s->pb); 84 85 return 0; 86} 87 88static int write_packet(AVFormatContext *s, AVPacket *pkt) 89{ 90 return 0; 91} 92 93AVOutputFormat ff_ffmetadata_muxer = { 94 .name = "ffmetadata", 95 .long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text format"), 96 .extensions = "ffmeta", 97 .write_header = write_header, 98 .write_packet = write_packet, 99 .write_trailer = write_trailer, 100 .flags = AVFMT_NOTIMESTAMPS | AVFMT_NOSTREAMS, 101}; 102