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/*
* Copyright (C) 2003-2012 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 "vorbis_comments.h"
#include "tag.h"
#include "replay_gain_info.h"
#include <glib.h>
#include <assert.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
static const char *
vorbis_comment_value(const char *comment, const char *needle)
{
size_t len = strlen(needle);
if (g_ascii_strncasecmp(comment, needle, len) == 0 &&
comment[len] == '=')
return comment + len + 1;
return NULL;
}
bool
vorbis_comments_to_replay_gain(struct replay_gain_info *rgi, char **comments)
{
const char *temp;
bool found = false;
replay_gain_info_init(rgi);
while (*comments) {
if ((temp =
vorbis_comment_value(*comments, "replaygain_track_gain"))) {
rgi->tuples[REPLAY_GAIN_TRACK].gain = atof(temp);
found = true;
} else if ((temp = vorbis_comment_value(*comments,
"replaygain_album_gain"))) {
rgi->tuples[REPLAY_GAIN_ALBUM].gain = atof(temp);
found = true;
} else if ((temp = vorbis_comment_value(*comments,
"replaygain_track_peak"))) {
rgi->tuples[REPLAY_GAIN_TRACK].peak = atof(temp);
found = true;
} else if ((temp = vorbis_comment_value(*comments,
"replaygain_album_peak"))) {
rgi->tuples[REPLAY_GAIN_ALBUM].peak = atof(temp);
found = true;
}
comments++;
}
return found;
}
static const char *VORBIS_COMMENT_TRACK_KEY = "tracknumber";
static const char *VORBIS_COMMENT_DISC_KEY = "discnumber";
/**
* Check if the comment's name equals the passed name, and if so, copy
* the comment value into the tag.
*/
static bool
vorbis_copy_comment(struct tag *tag, const char *comment,
const char *name, enum tag_type tag_type)
{
const char *value;
value = vorbis_comment_value(comment, name);
if (value != NULL) {
tag_add_item(tag, tag_type, value);
return true;
}
return false;
}
static void
vorbis_parse_comment(struct tag *tag, const char *comment)
{
assert(tag != NULL);
if (vorbis_copy_comment(tag, comment, VORBIS_COMMENT_TRACK_KEY,
TAG_TRACK) ||
vorbis_copy_comment(tag, comment, VORBIS_COMMENT_DISC_KEY,
TAG_DISC) ||
vorbis_copy_comment(tag, comment, "album artist",
TAG_ALBUM_ARTIST))
return;
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (vorbis_copy_comment(tag, comment,
tag_item_names[i], i))
return;
}
struct tag *
vorbis_comments_to_tag(char **comments)
{
struct tag *tag = tag_new();
while (*comments)
vorbis_parse_comment(tag, *comments++);
if (tag_is_empty(tag)) {
tag_free(tag);
tag = NULL;
}
return tag;
}
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