1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 /* 13 * This file contains the function WebRtcSpl_FilterMAFastQ12(). 14 * The description header can be found in signal_processing_library.h 15 * 16 */ 17 18 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" 19 20 void WebRtcSpl_FilterMAFastQ12(const int16_t* in_ptr, 21 int16_t* out_ptr, 22 const int16_t* B, 23 size_t B_length, 24 size_t length) 25 { 26 size_t i, j; 27 for (i = 0; i < length; i++) 28 { 29 int32_t o = 0; 30 31 for (j = 0; j < B_length; j++) 32 { 33 o += B[j] * in_ptr[i - j]; 34 } 35 36 // If output is higher than 32768, saturate it. Same with negative side 37 // 2^27 = 134217728, which corresponds to 32768 in Q12 38 39 // Saturate the output 40 o = WEBRTC_SPL_SAT((int32_t)134215679, o, (int32_t)-134217728); 41 42 *out_ptr++ = (int16_t)((o + (int32_t)2048) >> 12); 43 } 44 return; 45 } 46
