42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* This file contains the function WebRtcSpl_GetHanningWindow().
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* The description header can be found in signal_processing_library.h
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*
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*/
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#include "signal_processing_library.h"
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void WebRtcSpl_GetHanningWindow(WebRtc_Word16 *v, WebRtc_Word16 size)
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{
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int jj;
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WebRtc_Word16 *vptr1;
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WebRtc_Word32 index;
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WebRtc_Word32 factor = ((WebRtc_Word32)0x40000000);
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factor = WebRtcSpl_DivW32W16(factor, size);
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if (size < 513)
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index = (WebRtc_Word32)-0x200000;
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else
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index = (WebRtc_Word32)-0x100000;
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vptr1 = v;
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for (jj = 0; jj < size; jj++)
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{
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index += factor;
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(*vptr1++) = WebRtcSpl_kHanningTable[index >> 22];
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}
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}
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