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source: webrtc/webrtc/modules/audio_coding/codecs/ilbc/interpolate_samples.c @ 0:4bda6873e34c

pub_scrub_3792 tip
Last change on this file since 0:4bda6873e34c was 0:4bda6873e34c, checked in by Michael Prittie <mprittie@…>, 6 years ago

Scrubbed password for publication.

File size: 1.5 KB
Line 
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 iLBC Speech Coder ANSI-C Source Code
14
15 WebRtcIlbcfix_InterpolateSamples.c
16
17******************************************************************/
18
19#include "defines.h"
20#include "constants.h"
21
22void WebRtcIlbcfix_InterpolateSamples(
23    int16_t *interpSamples, /* (o) The interpolated samples */
24    int16_t *CBmem,   /* (i) The CB memory */
25    int16_t lMem    /* (i) Length of the CB memory */
26                                      ) {
27  int16_t *ppi, *ppo, i, j, temp1, temp2;
28  int16_t *tmpPtr;
29
30  /* Calculate the 20 vectors of interpolated samples (4 samples each)
31     that are used in the codebooks for lag 20 to 39 */
32  tmpPtr = interpSamples;
33  for (j=0; j<20; j++) {
34    temp1 = 0;
35    temp2 = 3;
36    ppo = CBmem+lMem-4;
37    ppi = CBmem+lMem-j-24;
38    for (i=0; i<4; i++) {
39
40      *tmpPtr++ = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WebRtcIlbcfix_kAlpha[temp2],*ppo, 15) +
41          (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WebRtcIlbcfix_kAlpha[temp1], *ppi, 15);
42
43      ppo++;
44      ppi++;
45      temp1++;
46      temp2--;
47    }
48  }
49
50  return;
51}
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