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/*
* Copyright (C) 2003-2013 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 "VorbisComments.hxx"
#include "XiphTags.h"
#include "tag.h"
#include "tag_table.h"
#include "tag_handler.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;
}
/**
* 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(const char *comment,
const char *name, enum tag_type tag_type,
const struct tag_handler *handler, void *handler_ctx)
{
const char *value;
value = vorbis_comment_value(comment, name);
if (value != NULL) {
tag_handler_invoke_tag(handler, handler_ctx, tag_type, value);
return true;
}
return false;
}
static void
vorbis_scan_comment(const char *comment,
const struct tag_handler *handler, void *handler_ctx)
{
if (handler->pair != NULL) {
char *name = g_strdup((const char*)comment);
char *value = strchr(name, '=');
if (value != NULL && value > name) {
*value++ = 0;
tag_handler_invoke_pair(handler, handler_ctx,
name, value);
}
g_free(name);
}
for (const struct tag_table *i = xiph_tags; i->name != NULL; ++i)
if (vorbis_copy_comment(comment, i->name, i->type,
handler, handler_ctx))
return;
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (vorbis_copy_comment(comment,
tag_item_names[i], tag_type(i),
handler, handler_ctx))
return;
}
void
vorbis_comments_scan(char **comments,
const struct tag_handler *handler, void *handler_ctx)
{
while (*comments)
vorbis_scan_comment(*comments++,
handler, handler_ctx);
}
struct tag *
vorbis_comments_to_tag(char **comments)
{
struct tag *tag = tag_new();
vorbis_comments_scan(comments, &add_tag_handler, tag);
if (tag_is_empty(tag)) {
tag_free(tag);
tag = NULL;
}
return tag;
}
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