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/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "OpusTags.hxx"
#include "OpusReader.hxx"
#include "XiphTags.hxx"
#include "tag/TagHandler.hxx"
#include "tag/Tag.hxx"
#include "ReplayGainInfo.hxx"
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
gcc_pure
static TagType
ParseOpusTagName(const char *name)
{
TagType type = tag_name_parse_i(name);
if (type != TAG_NUM_OF_ITEM_TYPES)
return type;
return tag_table_lookup_i(xiph_tags, name);
}
static void
ScanOneOpusTag(const char *name, const char *value,
ReplayGainInfo *rgi,
const struct tag_handler *handler, void *ctx)
{
if (rgi != nullptr && strcmp(name, "R128_TRACK_GAIN") == 0) {
/* R128_TRACK_GAIN is a Q7.8 fixed point number in
dB */
char *endptr;
long l = strtol(value, &endptr, 10);
if (endptr > value && *endptr == 0)
rgi->tuples[REPLAY_GAIN_TRACK].gain = double(l) / 256.;
}
tag_handler_invoke_pair(handler, ctx, name, value);
if (handler->tag != nullptr) {
TagType t = ParseOpusTagName(name);
if (t != TAG_NUM_OF_ITEM_TYPES)
tag_handler_invoke_tag(handler, ctx, t, value);
}
}
bool
ScanOpusTags(const void *data, size_t size,
ReplayGainInfo *rgi,
const struct tag_handler *handler, void *ctx)
{
OpusReader r(data, size);
if (!r.Expect("OpusTags", 8))
return false;
if (handler->pair == nullptr && handler->tag == nullptr)
return true;
if (!r.SkipString())
return false;
uint32_t n;
if (!r.ReadWord(n))
return false;
while (n-- > 0) {
char *p = r.ReadString();
if (p == nullptr)
return false;
char *eq = strchr(p, '=');
if (eq != nullptr && eq > p) {
*eq = 0;
ScanOneOpusTag(p, eq + 1, rgi, handler, ctx);
}
delete[] p;
}
return true;
}
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