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      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 implementations of the functions
     14  * WebRtcSpl_VectorBitShiftW16()
     15  * WebRtcSpl_VectorBitShiftW32()
     16  * WebRtcSpl_VectorBitShiftW32ToW16()
     17  * WebRtcSpl_ScaleVector()
     18  * WebRtcSpl_ScaleVectorWithSat()
     19  * WebRtcSpl_ScaleAndAddVectors()
     20  *
     21  * The description header can be found in signal_processing_library.h
     22  *
     23  */
     24 
     25 #include "signal_processing_library.h"
     26 
     27 void WebRtcSpl_VectorBitShiftW16(WebRtc_Word16 *res,
     28                              WebRtc_Word16 length,
     29                              G_CONST WebRtc_Word16 *in,
     30                              WebRtc_Word16 right_shifts)
     31 {
     32     int i;
     33 
     34     if (right_shifts > 0)
     35     {
     36         for (i = length; i > 0; i--)
     37         {
     38             (*res++) = ((*in++) >> right_shifts);
     39         }
     40     } else
     41     {
     42         for (i = length; i > 0; i--)
     43         {
     44             (*res++) = ((*in++) << (-right_shifts));
     45         }
     46     }
     47 }
     48 
     49 void WebRtcSpl_VectorBitShiftW32(WebRtc_Word32 *out_vector,
     50                              WebRtc_Word16 vector_length,
     51                              G_CONST WebRtc_Word32 *in_vector,
     52                              WebRtc_Word16 right_shifts)
     53 {
     54     int i;
     55 
     56     if (right_shifts > 0)
     57     {
     58         for (i = vector_length; i > 0; i--)
     59         {
     60             (*out_vector++) = ((*in_vector++) >> right_shifts);
     61         }
     62     } else
     63     {
     64         for (i = vector_length; i > 0; i--)
     65         {
     66             (*out_vector++) = ((*in_vector++) << (-right_shifts));
     67         }
     68     }
     69 }
     70 
     71 void WebRtcSpl_VectorBitShiftW32ToW16(WebRtc_Word16 *res,
     72                                   WebRtc_Word16 length,
     73                                   G_CONST WebRtc_Word32 *in,
     74                                   WebRtc_Word16 right_shifts)
     75 {
     76     int i;
     77 
     78     if (right_shifts >= 0)
     79     {
     80         for (i = length; i > 0; i--)
     81         {
     82             (*res++) = (WebRtc_Word16)((*in++) >> right_shifts);
     83         }
     84     } else
     85     {
     86         WebRtc_Word16 left_shifts = -right_shifts;
     87         for (i = length; i > 0; i--)
     88         {
     89             (*res++) = (WebRtc_Word16)((*in++) << left_shifts);
     90         }
     91     }
     92 }
     93 
     94 void WebRtcSpl_ScaleVector(G_CONST WebRtc_Word16 *in_vector, WebRtc_Word16 *out_vector,
     95                            WebRtc_Word16 gain, WebRtc_Word16 in_vector_length,
     96                            WebRtc_Word16 right_shifts)
     97 {
     98     // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts
     99     int i;
    100     G_CONST WebRtc_Word16 *inptr;
    101     WebRtc_Word16 *outptr;
    102 
    103     inptr = in_vector;
    104     outptr = out_vector;
    105 
    106     for (i = 0; i < in_vector_length; i++)
    107     {
    108         (*outptr++) = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(*inptr++, gain, right_shifts);
    109     }
    110 }
    111 
    112 void WebRtcSpl_ScaleVectorWithSat(G_CONST WebRtc_Word16 *in_vector, WebRtc_Word16 *out_vector,
    113                                  WebRtc_Word16 gain, WebRtc_Word16 in_vector_length,
    114                                  WebRtc_Word16 right_shifts)
    115 {
    116     // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts
    117     int i;
    118     WebRtc_Word32 tmpW32;
    119     G_CONST WebRtc_Word16 *inptr;
    120     WebRtc_Word16 *outptr;
    121 
    122     inptr = in_vector;
    123     outptr = out_vector;
    124 
    125     for (i = 0; i < in_vector_length; i++)
    126     {
    127         tmpW32 = WEBRTC_SPL_MUL_16_16_RSFT(*inptr++, gain, right_shifts);
    128         ( *outptr++) = (WebRtc_Word16)WEBRTC_SPL_SAT(32767, tmpW32, -32768);
    129     }
    130 }
    131 
    132 void WebRtcSpl_ScaleAndAddVectors(G_CONST WebRtc_Word16 *in1, WebRtc_Word16 gain1, int shift1,
    133                                   G_CONST WebRtc_Word16 *in2, WebRtc_Word16 gain2, int shift2,
    134                                   WebRtc_Word16 *out, int vector_length)
    135 {
    136     // Performs vector operation: out = (gain1*in1)>>shift1 + (gain2*in2)>>shift2
    137     int i;
    138     G_CONST WebRtc_Word16 *in1ptr;
    139     G_CONST WebRtc_Word16 *in2ptr;
    140     WebRtc_Word16 *outptr;
    141 
    142     in1ptr = in1;
    143     in2ptr = in2;
    144     outptr = out;
    145 
    146     for (i = 0; i < vector_length; i++)
    147     {
    148         (*outptr++) = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(gain1, *in1ptr++, shift1)
    149                 + (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(gain2, *in2ptr++, shift2);
    150     }
    151 }
    152