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      1 /*
      2  *  Copyright (c) 2012 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 implementations of the iLBC specific functions
     14  * WebRtcSpl_ReverseOrderMultArrayElements()
     15  * WebRtcSpl_ElementwiseVectorMult()
     16  * WebRtcSpl_AddVectorsAndShift()
     17  * WebRtcSpl_AddAffineVectorToVector()
     18  * WebRtcSpl_AffineTransformVector()
     19  *
     20  */
     21 
     22 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
     23 
     24 void WebRtcSpl_ReverseOrderMultArrayElements(int16_t *out, const int16_t *in,
     25                                              const int16_t *win,
     26                                              int16_t vector_length,
     27                                              int16_t right_shifts)
     28 {
     29     int i;
     30     int16_t *outptr = out;
     31     const int16_t *inptr = in;
     32     const int16_t *winptr = win;
     33     for (i = 0; i < vector_length; i++)
     34     {
     35         (*outptr++) = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(*inptr++,
     36                                                                *winptr--, right_shifts);
     37     }
     38 }
     39 
     40 void WebRtcSpl_ElementwiseVectorMult(int16_t *out, const int16_t *in,
     41                                      const int16_t *win, int16_t vector_length,
     42                                      int16_t right_shifts)
     43 {
     44     int i;
     45     int16_t *outptr = out;
     46     const int16_t *inptr = in;
     47     const int16_t *winptr = win;
     48     for (i = 0; i < vector_length; i++)
     49     {
     50         (*outptr++) = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(*inptr++,
     51                                                                *winptr++, right_shifts);
     52     }
     53 }
     54 
     55 void WebRtcSpl_AddVectorsAndShift(int16_t *out, const int16_t *in1,
     56                                   const int16_t *in2, int16_t vector_length,
     57                                   int16_t right_shifts)
     58 {
     59     int i;
     60     int16_t *outptr = out;
     61     const int16_t *in1ptr = in1;
     62     const int16_t *in2ptr = in2;
     63     for (i = vector_length; i > 0; i--)
     64     {
     65         (*outptr++) = (int16_t)(((*in1ptr++) + (*in2ptr++)) >> right_shifts);
     66     }
     67 }
     68 
     69 void WebRtcSpl_AddAffineVectorToVector(int16_t *out, int16_t *in,
     70                                        int16_t gain, int32_t add_constant,
     71                                        int16_t right_shifts, int vector_length)
     72 {
     73     int16_t *inPtr;
     74     int16_t *outPtr;
     75     int i;
     76 
     77     inPtr = in;
     78     outPtr = out;
     79     for (i = 0; i < vector_length; i++)
     80     {
     81         (*outPtr++) += (int16_t)((WEBRTC_SPL_MUL_16_16((*inPtr++), gain)
     82                 + (int32_t)add_constant) >> right_shifts);
     83     }
     84 }
     85 
     86 void WebRtcSpl_AffineTransformVector(int16_t *out, int16_t *in,
     87                                      int16_t gain, int32_t add_constant,
     88                                      int16_t right_shifts, int vector_length)
     89 {
     90     int16_t *inPtr;
     91     int16_t *outPtr;
     92     int i;
     93 
     94     inPtr = in;
     95     outPtr = out;
     96     for (i = 0; i < vector_length; i++)
     97     {
     98         (*outPtr++) = (int16_t)((WEBRTC_SPL_MUL_16_16((*inPtr++), gain)
     99                 + (int32_t)add_constant) >> right_shifts);
    100     }
    101 }
    102