50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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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_FilterMAFastQ12().
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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_FilterMAFastQ12(WebRtc_Word16* in_ptr,
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WebRtc_Word16* out_ptr,
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WebRtc_Word16* B,
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WebRtc_Word16 B_length,
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WebRtc_Word16 length)
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{
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WebRtc_Word32 o;
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int i, j;
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for (i = 0; i < length; i++)
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{
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G_CONST WebRtc_Word16* b_ptr = &B[0];
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G_CONST WebRtc_Word16* x_ptr = &in_ptr[i];
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o = (WebRtc_Word32)0;
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for (j = 0; j < B_length; j++)
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{
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o += WEBRTC_SPL_MUL_16_16(*b_ptr++, *x_ptr--);
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}
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// If output is higher than 32768, saturate it. Same with negative side
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// 2^27 = 134217728, which corresponds to 32768 in Q12
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// Saturate the output
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o = WEBRTC_SPL_SAT((WebRtc_Word32)134215679, o, (WebRtc_Word32)-134217728);
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*out_ptr++ = (WebRtc_Word16)((o + (WebRtc_Word32)2048) >> 12);
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}
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return;
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}
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