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-rw-r--r--src/conf.h3
-rw-r--r--src/filter/chain_filter_plugin.c99
-rw-r--r--src/filter/chain_filter_plugin.h12
-rw-r--r--src/output_init.c4
4 files changed, 118 insertions, 0 deletions
diff --git a/src/conf.h b/src/conf.h
index 7dd12afda..049c980ec 100644
--- a/src/conf.h
+++ b/src/conf.h
@@ -42,6 +42,7 @@
#define CONF_PASSWORD "password"
#define CONF_DEFAULT_PERMS "default_permissions"
#define CONF_AUDIO_OUTPUT "audio_output"
+#define CONF_AUDIO_FILTER "filter"
#define CONF_AUDIO_OUTPUT_FORMAT "audio_output_format"
#define CONF_MIXER_TYPE "mixer_type"
#define CONF_REPLAYGAIN "replaygain"
@@ -73,6 +74,8 @@
#define DEFAULT_PLAYLIST_MAX_LENGTH (1024*16)
#define DEFAULT_PLAYLIST_SAVE_ABSOLUTE_PATHS false
+#define MAX_FILTER_CHAIN_LENGTH 255
+
struct block_param {
char *name;
char *value;
diff --git a/src/filter/chain_filter_plugin.c b/src/filter/chain_filter_plugin.c
index 5cd8aa014..5f9544b50 100644
--- a/src/filter/chain_filter_plugin.c
+++ b/src/filter/chain_filter_plugin.c
@@ -18,12 +18,14 @@
*/
#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 <assert.h>
+#include <string.h>
struct filter_chain {
/** the base class */
@@ -176,3 +178,100 @@ filter_chain_append(struct filter *_chain, struct filter *filter)
chain->children = g_slist_append(chain->children, filter);
}
+
+/**
+ * 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;
+}
diff --git a/src/filter/chain_filter_plugin.h b/src/filter/chain_filter_plugin.h
index f8462b22d..54e07081d 100644
--- a/src/filter/chain_filter_plugin.h
+++ b/src/filter/chain_filter_plugin.h
@@ -45,4 +45,16 @@ filter_chain_new(void);
void
filter_chain_append(struct filter *chain, struct filter *filter);
+/**
+ * Builds a filter chain from a configuration string on the form
+ * "name1, name2, name3, ..." by looking up each name among the
+ * configured filter sections. If no filters are specified, a
+ * null filter is automatically appended.
+ * @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);
+
#endif
diff --git a/src/output_init.c b/src/output_init.c
index a1b79c994..6ca190fd0 100644
--- a/src/output_init.c
+++ b/src/output_init.c
@@ -41,6 +41,7 @@
#define AUDIO_OUTPUT_TYPE "type"
#define AUDIO_OUTPUT_NAME "name"
#define AUDIO_OUTPUT_FORMAT "format"
+#define AUDIO_FILTERS "filters"
static const struct audio_output_plugin *
audio_output_detect(GError **error)
@@ -190,6 +191,9 @@ audio_output_init(struct audio_output *ao, const struct config_param *param,
ao->filter = filter_chain_new();
assert(ao->filter != NULL);
+ filter_chain_parse(ao->filter,
+ config_get_block_string(param, AUDIO_FILTERS, "")
+ );
ao->thread = NULL;
ao->command = AO_COMMAND_NONE;