56 lines
1.8 KiB
C
56 lines
1.8 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 "common_audio/signal_processing/include/signal_processing_library.h"
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#include "rtc_base/sanitizer.h"
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void WebRtcSpl_FilterMAFastQ12(const int16_t* in_ptr,
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int16_t* out_ptr,
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const int16_t* B,
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size_t B_length,
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size_t length)
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{
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size_t i, j;
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rtc_MsanCheckInitialized(B, sizeof(B[0]), B_length);
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rtc_MsanCheckInitialized(in_ptr - B_length + 1, sizeof(in_ptr[0]),
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B_length + length - 1);
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for (i = 0; i < length; i++)
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{
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int32_t o = 0;
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for (j = 0; j < B_length; j++)
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{
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// Negative overflow is permitted here, because this is
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// auto-regressive filters, and the state for each batch run is
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// stored in the "negative" positions of the output vector.
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o += B[j] * in_ptr[(ptrdiff_t) i - (ptrdiff_t) j];
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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((int32_t)134215679, o, (int32_t)-134217728);
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*out_ptr++ = (int16_t)((o + (int32_t)2048) >> 12);
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}
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return;
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}
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