/*
  * Metadata muxer
  * Copyright (c) 2010 Anton Khirnov
  *
  * 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 <inttypes.h>
 

 #include "avformat.h"

 #include "ffmeta.h"

 #include "libavutil/dict.h"

 static void write_escape_str(AVIOContext *s, const uint8_t *str)

 {
     const uint8_t *p = str;
 
     while (*p) {
         if (*p == '#' || *p == ';' || *p == '=' || *p == '\\' || *p == '\n')

             avio_w8(s, '\\');
         avio_w8(s, *p);

         p++;
     }
 }
 

 static void write_tags(AVIOContext *s, AVDictionary *m)

 {

     AVDictionaryEntry *t = NULL;
     while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {

         write_escape_str(s, t->key);

         avio_w8(s, '=');

         write_escape_str(s, t->value);

         avio_w8(s, '\n');

     }
 }
 
 static int write_header(AVFormatContext *s)
 {

     avio_write(s->pb, ID_STRING, sizeof(ID_STRING) - 1);

     avio_w8(s->pb, '1');          // version
     avio_w8(s->pb, '\n');

     avio_flush(s->pb);

     return 0;
 }
 
 static int write_trailer(AVFormatContext *s)
 {
     int i;
 
     write_tags(s->pb, s->metadata);
 
     for (i = 0; i < s->nb_streams; i++) {

         avio_write(s->pb, ID_STREAM, sizeof(ID_STREAM) - 1);

         avio_w8(s->pb, '\n');

         write_tags(s->pb, s->streams[i]->metadata);
     }
 
     for (i = 0; i < s->nb_chapters; i++) {
         AVChapter *ch = s->chapters[i];

         avio_write(s->pb, ID_CHAPTER, sizeof(ID_CHAPTER) - 1);

         avio_w8(s->pb, '\n');

         avio_printf(s->pb, "TIMEBASE=%d/%d\n", ch->time_base.num, ch->time_base.den);
         avio_printf(s->pb, "START=%"PRId64"\n", ch->start);
         avio_printf(s->pb, "END=%"PRId64"\n",   ch->end);

         write_tags(s->pb, ch->metadata);
     }
 
     return 0;
 }
 
 static int write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     return 0;
 }
 

 AVOutputFormat ff_ffmetadata_muxer = {

     .name          = "ffmetadata",

     .long_name     = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text"),

     .extensions    = "ffmeta",
     .write_header  = write_header,
     .write_packet  = write_packet,
     .write_trailer = write_trailer,
     .flags         = AVFMT_NOTIMESTAMPS | AVFMT_NOSTREAMS,
 };