111 lines
3.0 KiB
C++
111 lines
3.0 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "FilterConfig.hxx"
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#include "filter/ChainFilterPlugin.hxx"
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#include "FilterPlugin.hxx"
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#include "FilterInternal.hxx"
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#include "FilterRegistry.hxx"
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#include "ConfigData.hxx"
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#include "ConfigOption.hxx"
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#include "ConfigGlobal.hxx"
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#include "ConfigError.hxx"
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#include "util/Error.hxx"
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#include <algorithm>
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#include <string.h>
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/**
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* Find the "filter" configuration block for the specified name.
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*
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* @param filter_template_name the name of the filter template
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* @param error space to return an error description
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* @return the configuration block, or nullptr if none was configured
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*/
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static const struct config_param *
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filter_plugin_config(const char *filter_template_name, Error &error)
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{
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const struct config_param *param = nullptr;
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while ((param = config_get_next_param(CONF_AUDIO_FILTER, param)) != nullptr) {
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const char *name = param->GetBlockValue("name");
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if (name == nullptr) {
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error.Format(config_domain,
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"filter configuration without 'name' name in line %d",
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param->line);
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return nullptr;
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}
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if (strcmp(name, filter_template_name) == 0)
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return param;
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}
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error.Format(config_domain,
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"filter template not found: %s",
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filter_template_name);
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return nullptr;
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}
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static bool
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filter_chain_append_new(Filter &chain, const char *template_name, Error &error)
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{
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const struct config_param *cfg =
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filter_plugin_config(template_name, error);
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if (cfg == nullptr)
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// The error has already been set, just stop.
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return false;
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// Instantiate one of those filter plugins with the template name as a hint
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Filter *f = filter_configured_new(*cfg, error);
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if (f == nullptr)
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// The error has already been set, just stop.
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return false;
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const char *plugin_name = cfg->GetBlockValue("plugin",
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"unknown");
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filter_chain_append(chain, plugin_name, f);
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return true;
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}
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bool
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filter_chain_parse(Filter &chain, const char *spec, Error &error)
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{
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const char *const end = spec + strlen(spec);
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while (true) {
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const char *comma = std::find(spec, end, ',');
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if (comma > spec) {
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const std::string name(spec, comma);
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if (!filter_chain_append_new(chain, name.c_str(),
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error))
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return false;
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}
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if (comma == end)
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break;
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spec = comma + 1;
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}
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return true;
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}
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