1 files changed, 84 insertions, 0 deletions
diff --git a/src/filter/NormalizeFilterPlugin.cxx b/src/filter/NormalizeFilterPlugin.cxx
new file mode 100644
index 00000000..e18c5cdf
--- /dev/null
+++ b/src/filter/NormalizeFilterPlugin.cxx
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2003-2013 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 "FilterPlugin.hxx"
+#include "FilterInternal.hxx"
+#include "FilterRegistry.hxx"
+#include "pcm_buffer.h"
+#include "audio_format.h"
+#include "AudioCompress/compress.h"
+
+#include <assert.h>
+#include <string.h>
+
+class NormalizeFilter final : public Filter {
+	struct Compressor *compressor;
+
+	struct pcm_buffer buffer;
+
+public:
+	virtual const audio_format *Open(audio_format &af, GError **error_r);
+	virtual void Close();
+	virtual const void *FilterPCM(const void *src, size_t src_size,
+				      size_t *dest_size_r, GError **error_r);
+};
+
+static Filter *
+normalize_filter_init(gcc_unused const struct config_param *param,
+		      gcc_unused GError **error_r)
+{
+	return new NormalizeFilter();
+}
+
+const struct audio_format *
+NormalizeFilter::Open(audio_format &audio_format, gcc_unused GError **error_r)
+{
+	audio_format.format = SAMPLE_FORMAT_S16;
+
+	compressor = Compressor_new(0);
+	pcm_buffer_init(&buffer);
+
+	return &audio_format;
+}
+
+void
+NormalizeFilter::Close()
+{
+	pcm_buffer_deinit(&buffer);
+	Compressor_delete(compressor);
+}
+
+const void *
+NormalizeFilter::FilterPCM(const void *src, size_t src_size,
+			   size_t *dest_size_r, gcc_unused GError **error_r)
+{
+	int16_t *dest = (int16_t *)pcm_buffer_get(&buffer, src_size);
+	memcpy(dest, src, src_size);
+
+	Compressor_Process_int16(compressor, dest, src_size / 2);
+
+	*dest_size_r = src_size;
+	return dest;
+}
+
+const struct filter_plugin normalize_filter_plugin = {
+	"normalize",
+	normalize_filter_init,
+};