1 files changed, 41 insertions, 0 deletions
diff --git a/src/common_audio/signal_processing_library/main/source/get_hanning_window.c b/src/common_audio/signal_processing_library/main/source/get_hanning_window.c
new file mode 100644
index 0000000000..2845c8385a
--- /dev/null
+++ b/src/common_audio/signal_processing_library/main/source/get_hanning_window.c
@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_GetHanningWindow().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "signal_processing_library.h"
+
+void WebRtcSpl_GetHanningWindow(WebRtc_Word16 *v, WebRtc_Word16 size)
+{
+    int jj;
+    WebRtc_Word16 *vptr1;
+
+    WebRtc_Word32 index;
+    WebRtc_Word32 factor = ((WebRtc_Word32)0x40000000);
+
+    factor = WebRtcSpl_DivW32W16(factor, size);
+    if (size < 513)
+        index = (WebRtc_Word32)-0x200000;
+    else
+        index = (WebRtc_Word32)-0x100000;
+    vptr1 = v;
+
+    for (jj = 0; jj < size; jj++)
+    {
+        index += factor;
+        (*vptr1++) = WebRtcSpl_kHanningTable[index >> 22];
+    }
+
+}