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/*
* 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_FilterMAFastQ12().
* The description header can be found in signal_processing_library.h
*
*/
#include "signal_processing_library.h"
void WebRtcSpl_FilterMAFastQ12(WebRtc_Word16* in_ptr,
WebRtc_Word16* out_ptr,
WebRtc_Word16* B,
WebRtc_Word16 B_length,
WebRtc_Word16 length)
{
WebRtc_Word32 o;
int i, j;
for (i = 0; i < length; i++)
{
G_CONST WebRtc_Word16* b_ptr = &B[0];
G_CONST WebRtc_Word16* x_ptr = &in_ptr[i];
o = (WebRtc_Word32)0;
for (j = 0; j < B_length; j++)
{
o += WEBRTC_SPL_MUL_16_16(*b_ptr++, *x_ptr--);
}
// If output is higher than 32768, saturate it. Same with negative side
// 2^27 = 134217728, which corresponds to 32768 in Q12
// Saturate the output
o = WEBRTC_SPL_SAT((WebRtc_Word32)134215679, o, (WebRtc_Word32)-134217728);
*out_ptr++ = (WebRtc_Word16)((o + (WebRtc_Word32)2048) >> 12);
}
return;
}
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