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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 "FilterConfig.hxx"
#include "filter/ChainFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "ConfigData.hxx"
#include "ConfigOption.hxx"
#include "ConfigGlobal.hxx"
#include "ConfigError.hxx"
#include "util/Error.hxx"
#include <algorithm>
#include <string.h>
/**
* Find the "filter" configuration block for the specified name.
*
* @param filter_template_name the name of the filter template
* @param error space to return an error description
* @return the configuration block, or nullptr if none was configured
*/
static const struct config_param *
filter_plugin_config(const char *filter_template_name, Error &error)
{
const struct config_param *param = nullptr;
while ((param = config_get_next_param(CONF_AUDIO_FILTER, param)) != nullptr) {
const char *name = param->GetBlockValue("name");
if (name == nullptr) {
error.Format(config_domain,
"filter configuration without 'name' name in line %d",
param->line);
return nullptr;
}
if (strcmp(name, filter_template_name) == 0)
return param;
}
error.Format(config_domain,
"filter template not found: %s",
filter_template_name);
return nullptr;
}
static bool
filter_chain_append_new(Filter &chain, const char *template_name, Error &error)
{
const struct config_param *cfg =
filter_plugin_config(template_name, error);
if (cfg == nullptr)
// The error has already been set, just stop.
return false;
// Instantiate one of those filter plugins with the template name as a hint
Filter *f = filter_configured_new(*cfg, error);
if (f == nullptr)
// The error has already been set, just stop.
return false;
const char *plugin_name = cfg->GetBlockValue("plugin",
"unknown");
filter_chain_append(chain, plugin_name, f);
return true;
}
bool
filter_chain_parse(Filter &chain, const char *spec, Error &error)
{
const char *const end = spec + strlen(spec);
while (true) {
const char *comma = std::find(spec, end, ',');
if (comma > spec) {
const std::string name(spec, comma);
if (!filter_chain_append_new(chain, name.c_str(),
error))
return false;
}
if (comma == end)
break;
spec = comma + 1;
}
return true;
}
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