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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_FilterARFastQ12().
* The description header can be found in signal_processing_library.h
*
*/
#include "signal_processing_library.h"
void WebRtcSpl_FilterARFastQ12(WebRtc_Word16 *in, WebRtc_Word16 *out, WebRtc_Word16 *A,
WebRtc_Word16 A_length, WebRtc_Word16 length)
{
WebRtc_Word32 o;
int i, j;
WebRtc_Word16 *x_ptr = &in[0];
WebRtc_Word16 *filtered_ptr = &out[0];
for (i = 0; i < length; i++)
{
// Calculate filtered[i]
G_CONST WebRtc_Word16 *a_ptr = &A[0];
WebRtc_Word16 *state_ptr = &out[i - 1];
o = WEBRTC_SPL_MUL_16_16(*x_ptr++, *a_ptr++);
for (j = 1; j < A_length; j++)
{
o -= WEBRTC_SPL_MUL_16_16(*a_ptr++,*state_ptr--);
}
// Saturate the output
o = WEBRTC_SPL_SAT((WebRtc_Word32)134215679, o, (WebRtc_Word32)-134217728);
*filtered_ptr++ = (WebRtc_Word16)((o + (WebRtc_Word32)2048) >> 12);
}
return;
}
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