2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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.
11 /******************************************************************
13 iLBC Speech Coder ANSI-C Source Code
15 WebRtcIlbcfix_Refiner.c
17 ******************************************************************/
20 #include "constants.h"
21 #include "enh_upsample.h"
24 /*----------------------------------------------------------------*
25 * find segment starting near idata+estSegPos that has highest
26 * correlation with idata+centerStartPos through
27 * idata+centerStartPos+ENH_BLOCKL-1 segment is found at a
28 * resolution of ENH_UPSO times the original of the original
30 *---------------------------------------------------------------*/
32 void WebRtcIlbcfix_Refiner(
33 int16_t *updStartPos, /* (o) updated start point (Q-2) */
34 int16_t *idata, /* (i) original data buffer */
35 int16_t idatal, /* (i) dimension of idata */
36 int16_t centerStartPos, /* (i) beginning center segment */
37 int16_t estSegPos, /* (i) estimated beginning other segment (Q-2) */
38 int16_t *surround, /* (i/o) The contribution from this sequence
39 summed with earlier contributions */
40 int16_t gain /* (i) Gain to use for this sequence */
42 int16_t estSegPosRounded,searchSegStartPos,searchSegEndPos,corrdim;
43 int16_t tloc,tloc2,i,st,en,fraction;
45 int32_t maxtemp, scalefact;
46 int16_t *filtStatePtr, *polyPtr;
49 int32_t corrVecUps[ENH_CORRDIM*ENH_UPS0];
50 int32_t corrVecTemp[ENH_CORRDIM];
51 int16_t vect[ENH_VECTL];
52 int16_t corrVec[ENH_CORRDIM];
54 /* defining array bounds */
56 estSegPosRounded = (estSegPos - 2) >> 2;
58 searchSegStartPos=estSegPosRounded-ENH_SLOP;
60 if (searchSegStartPos<0) {
63 searchSegEndPos=estSegPosRounded+ENH_SLOP;
65 if(searchSegEndPos+ENH_BLOCKL >= idatal) {
66 searchSegEndPos=idatal-ENH_BLOCKL-1;
68 corrdim=searchSegEndPos-searchSegStartPos+1;
70 /* compute upsampled correlation and find
73 WebRtcIlbcfix_MyCorr(corrVecTemp,idata+searchSegStartPos,
74 (int16_t)(corrdim+ENH_BLOCKL-1),idata+centerStartPos,ENH_BLOCKL);
76 /* Calculate the rescaling factor for the correlation in order to
77 put the correlation in a int16_t vector instead */
78 maxtemp=WebRtcSpl_MaxAbsValueW32(corrVecTemp, (int16_t)corrdim);
80 scalefact=WebRtcSpl_GetSizeInBits(maxtemp)-15;
83 for (i=0;i<corrdim;i++) {
84 corrVec[i] = (int16_t)(corrVecTemp[i] >> scalefact);
87 for (i=0;i<corrdim;i++) {
88 corrVec[i]=(int16_t)corrVecTemp[i];
91 /* In order to guarantee that all values are initialized */
92 for (i=corrdim;i<ENH_CORRDIM;i++) {
96 /* Upsample the correlation */
97 WebRtcIlbcfix_EnhUpsample(corrVecUps,corrVec);
100 tloc=WebRtcSpl_MaxIndexW32(corrVecUps, (int16_t) (ENH_UPS0*corrdim));
102 /* make vector can be upsampled without ever running outside
104 *updStartPos = (int16_t)WEBRTC_SPL_MUL_16_16(searchSegStartPos,4) + tloc + 4;
106 tloc2 = (tloc + 3) >> 2;
108 st=searchSegStartPos+tloc2-ENH_FL0;
110 /* initialize the vector to be filtered, stuff with zeros
111 when data is outside idata buffer */
113 WebRtcSpl_MemSetW16(vect, 0, (int16_t)(-st));
114 WEBRTC_SPL_MEMCPY_W16(&vect[-st], idata, (ENH_VECTL+st));
120 WEBRTC_SPL_MEMCPY_W16(vect, &idata[st],
121 (ENH_VECTL-(en-idatal)));
122 WebRtcSpl_MemSetW16(&vect[ENH_VECTL-(en-idatal)], 0,
123 (int16_t)(en-idatal));
126 WEBRTC_SPL_MEMCPY_W16(vect, &idata[st], ENH_VECTL);
129 /* Calculate which of the 4 fractions to use */
130 fraction=(int16_t)WEBRTC_SPL_MUL_16_16(tloc2,ENH_UPS0)-tloc;
132 /* compute the segment (this is actually a convolution) */
134 filtStatePtr = filt + 6;
135 polyPtr = (int16_t*)WebRtcIlbcfix_kEnhPolyPhaser[fraction];
137 *filtStatePtr-- = *polyPtr++;
140 WebRtcSpl_FilterMAFastQ12(
141 &vect[6], vect, filt,
142 ENH_FLO_MULT2_PLUS1, ENH_BLOCKL);
144 /* Add the contribution from this vector (scaled with gain) to the total surround vector */
145 WebRtcSpl_AddAffineVectorToVector(
146 surround, vect, gain,
147 (int32_t)32768, 16, ENH_BLOCKL);