127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/*
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* Copyright (C) 2003-2009 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 "filter_config.h"
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#include "config.h"
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#include "conf.h"
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#include "filter/chain_filter_plugin.h"
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#include "filter_plugin.h"
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#include "filter_internal.h"
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#include "filter_registry.h"
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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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* @return the configuration block, or NULL 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)
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{
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const struct config_param *param = NULL;
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while ((param = config_get_next_param(CONF_AUDIO_FILTER, param)) != NULL) {
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const char *name =
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config_get_block_string(param, "name", NULL);
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if (name == NULL)
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g_error("filter configuration without 'name' name in line %d",
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param->line);
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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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return NULL;
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}
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/**
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* Builds a filter chain from a configuration string on the form
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* "name1, name2, name3, ..." by looking up each name among the
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* configured filter sections.
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* @param chain the chain to append filters on
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* @param spec the filter chain specification
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* @return the number of filters which were successfully added
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*/
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unsigned int
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filter_chain_parse(struct filter *chain, const char *spec)
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{
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// Split on comma
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gchar** tokens = g_strsplit_set(spec, ",", 255);
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int added_filters = 0;
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// Add each name to the filter chain by instantiating an actual filter
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char **template_names = tokens;
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while (*template_names != NULL) {
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const char *plugin_name;
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const struct filter_plugin *fp;
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struct filter *f;
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const struct config_param *cfg;
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// Squeeze whitespace
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g_strstrip(*template_names);
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cfg = filter_plugin_config(*template_names);
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if (cfg == NULL) {
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g_error("Unable to locate filter template %s",
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*template_names);
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++template_names;
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continue;
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}
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// Figure out what kind of a plugin that is
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plugin_name = config_get_block_string(cfg, "plugin", NULL);
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if (plugin_name == NULL) {
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g_error("filter configuration without 'plugin' at line %d",
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cfg->line);
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++template_names;
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continue;
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}
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// Instantiate one of those filter plugins with the template name as a hint
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fp = filter_plugin_by_name(plugin_name);
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if (fp == NULL) {
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g_error("filter plugin not found: %s",
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plugin_name);
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++template_names;
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continue;
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}
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f = filter_new(fp, cfg, NULL);
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if (f == NULL) {
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g_error("filter plugin initialization failed: %s",
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plugin_name);
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++template_names;
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continue;
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}
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filter_chain_append(chain, f);
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++added_filters;
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++template_names;
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}
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g_strfreev(tokens);
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return added_filters;
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}
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