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authorMax Kellermann <max@duempel.org>2009-07-03 01:02:53 +0200
committerMax Kellermann <max@duempel.org>2009-07-03 01:02:53 +0200
commit48f3e13beccec63de5322e2cc0c241527efeabef (patch)
tree8ec13aed180ef6e423e783d7a1ac803098f4d79d /src/filter
parenta923080d9b0d4866025404bcaf97111707d6fe23 (diff)
downloadmpd-48f3e13beccec63de5322e2cc0c241527efeabef.tar.gz
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filter: added new plugin API for filters
The filter API allows us to implement software volume as a pluggable filter, and we will be able to integrate libraries like SoX.
Diffstat (limited to 'src/filter')
-rw-r--r--src/filter/null_filter_plugin.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/src/filter/null_filter_plugin.c b/src/filter/null_filter_plugin.c
new file mode 100644
index 000000000..689388558
--- /dev/null
+++ b/src/filter/null_filter_plugin.c
@@ -0,0 +1,93 @@
+/*
+ * 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.
+ */
+
+/** \file
+ *
+ * This filter plugin does nothing. That is not quite useful, except
+ * for testing the filter core, or as a template for new filter
+ * plugins.
+ */
+
+#include "filter_plugin.h"
+#include "filter_internal.h"
+#include "filter_registry.h"
+
+#include <assert.h>
+
+struct null_filter {
+ struct filter filter;
+};
+
+static struct filter *
+null_filter_init(G_GNUC_UNUSED const struct config_param *param,
+ G_GNUC_UNUSED GError **error_r)
+{
+ struct null_filter *filter = g_new(struct null_filter, 1);
+
+ filter_init(&filter->filter, &null_filter_plugin);
+ return &filter->filter;
+}
+
+static void
+null_filter_finish(struct filter *_filter)
+{
+ struct null_filter *filter = (struct null_filter *)_filter;
+
+ g_free(filter);
+}
+
+static const struct audio_format *
+null_filter_open(struct filter *_filter,
+ const struct audio_format *audio_format,
+ G_GNUC_UNUSED GError **error_r)
+{
+ struct null_filter *filter = (struct null_filter *)_filter;
+ (void)filter;
+
+ return audio_format;
+}
+
+static void
+null_filter_close(struct filter *_filter)
+{
+ struct null_filter *filter = (struct null_filter *)_filter;
+ (void)filter;
+}
+
+static const void *
+null_filter_filter(struct filter *_filter,
+ const void *src, size_t src_size,
+ size_t *dest_size_r, G_GNUC_UNUSED GError **error_r)
+{
+ struct null_filter *filter = (struct null_filter *)_filter;
+ (void)filter;
+
+ /* return the unmodified source buffer */
+ *dest_size_r = src_size;
+ return src;
+}
+
+const struct filter_plugin null_filter_plugin = {
+ .name = "null",
+ .init = null_filter_init,
+ .finish = null_filter_finish,
+ .open = null_filter_open,
+ .close = null_filter_close,
+ .filter = null_filter_filter,
+};