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/*
* APE tag writer
* Copyright (c) 2012 Paul B Mahol
*
* 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 "libavutil/dict.h"
#include "avio_internal.h"
#include "avformat.h"
#include "apetag.h"
#define APE_TAG_PREAMBLE "APETAGEX"
#define APE_TAG_VERSION 2000
#define APE_TAG_FOOTER_BYTES 32
static int string_is_ascii(const uint8_t *str)
{
while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
return !*str;
}
void ff_ape_write(AVFormatContext *s)
{
int64_t tag_bytes;
AVDictionaryEntry *t = NULL;
AVIOContext *pb = s->pb;
int tags = 0, vlen;
tag_bytes = avio_tell(s->pb);
while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
if (!string_is_ascii(t->key)) {
av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
continue;
}
vlen = strlen(t->value);
avio_wl32(pb, vlen + 1);
avio_wl32(pb, 0); // flags
avio_put_str(pb, t->key);
avio_put_str(pb, t->value);
tags++;
}
tag_bytes = avio_tell(s->pb) - tag_bytes;
if (!tags)
return;
avio_write(pb, APE_TAG_PREAMBLE, 8);
avio_wl32(pb, APE_TAG_VERSION);
avio_wl32(pb, tag_bytes + APE_TAG_FOOTER_BYTES);
avio_wl32(pb, tags); // item count
avio_wl32(pb, 0); // global flags
ffio_fill(pb, 0, 8); // reserved
}
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