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/*
* Copyright (C) 2003-2009 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 "filter_config.h"
#include "config.h"
#include "conf.h"
#include "filter/chain_filter_plugin.h"
#include "filter_plugin.h"
#include "filter_internal.h"
#include "filter_registry.h"
#include <string.h>
/**
* Find the "filter" configuration block for the specified name.
*
* @param filter_template_name the name of the filter template
* @return the configuration block, or NULL if none was configured
*/
static const struct config_param *
filter_plugin_config(const char *filter_template_name)
{
const struct config_param *param = NULL;
while ((param = config_get_next_param(CONF_AUDIO_FILTER, param)) != NULL) {
const char *name =
config_get_block_string(param, "name", NULL);
if (name == NULL)
g_error("filter configuration without 'name' name in line %d",
param->line);
if (strcmp(name, filter_template_name) == 0)
return param;
}
return NULL;
}
/**
* Builds a filter chain from a configuration string on the form
* "name1, name2, name3, ..." by looking up each name among the
* configured filter sections.
* @param chain the chain to append filters on
* @param spec the filter chain specification
* @return the number of filters which were successfully added
*/
unsigned int
filter_chain_parse(struct filter *chain, const char *spec)
{
// Split on comma
gchar** tokens = g_strsplit_set(spec, ",", 255);
int added_filters = 0;
// Add each name to the filter chain by instantiating an actual filter
char **template_names = tokens;
while (*template_names != NULL) {
const char *plugin_name;
const struct filter_plugin *fp;
struct filter *f;
const struct config_param *cfg;
// Squeeze whitespace
g_strstrip(*template_names);
cfg = filter_plugin_config(*template_names);
if (cfg == NULL) {
g_error("Unable to locate filter template %s",
*template_names);
++template_names;
continue;
}
// Figure out what kind of a plugin that is
plugin_name = config_get_block_string(cfg, "plugin", NULL);
if (plugin_name == NULL) {
g_error("filter configuration without 'plugin' at line %d",
cfg->line);
++template_names;
continue;
}
// Instantiate one of those filter plugins with the template name as a hint
fp = filter_plugin_by_name(plugin_name);
if (fp == NULL) {
g_error("filter plugin not found: %s",
plugin_name);
++template_names;
continue;
}
f = filter_new(fp, cfg, NULL);
if (f == NULL) {
g_error("filter plugin initialization failed: %s",
plugin_name);
++template_names;
continue;
}
filter_chain_append(chain, f);
++added_filters;
++template_names;
}
g_strfreev(tokens);
return added_filters;
}
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