1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_CbMemEnergy.c
******************************************************************/
#include "defines.h"
#include "constants.h"
#include "cb_mem_energy_calc.h"
/*----------------------------------------------------------------*
* Function WebRtcIlbcfix_CbMemEnergy computes the energy of all
* the vectors in the codebook memory that will be used in the
* following search for the best match.
*----------------------------------------------------------------*/
void WebRtcIlbcfix_CbMemEnergy(
int16_t range,
int16_t *CB, /* (i) The CB memory (1:st section) */
int16_t *filteredCB, /* (i) The filtered CB memory (2:nd section) */
int16_t lMem, /* (i) Length of the CB memory */
int16_t lTarget, /* (i) Length of the target vector */
int16_t *energyW16, /* (o) Energy in the CB vectors */
int16_t *energyShifts, /* (o) Shift value of the energy */
int16_t scale, /* (i) The scaling of all energy values */
int16_t base_size /* (i) Index to where the energy values should be stored */
) {
int16_t *ppi, *ppo, *pp;
int32_t energy, tmp32;
/* Compute the energy and store it in a vector. Also the
* corresponding shift values are stored. The energy values
* are reused in all three stages. */
/* Calculate the energy in the first block of 'lTarget' sampels. */
ppi = CB+lMem-lTarget-1;
ppo = CB+lMem-1;
pp=CB+lMem-lTarget;
energy = WebRtcSpl_DotProductWithScale( pp, pp, lTarget, scale);
/* Normalize the energy and store the number of shifts */
energyShifts[0] = (int16_t)WebRtcSpl_NormW32(energy);
tmp32 = WEBRTC_SPL_LSHIFT_W32(energy, energyShifts[0]);
energyW16[0] = (int16_t)WEBRTC_SPL_RSHIFT_W32(tmp32, 16);
/* Compute the energy of the rest of the cb memory
* by step wise adding and subtracting the next
* sample and the last sample respectively. */
WebRtcIlbcfix_CbMemEnergyCalc(energy, range, ppi, ppo, energyW16, energyShifts, scale, 0);
/* Next, precompute the energy values for the filtered cb section */
energy=0;
pp=filteredCB+lMem-lTarget;
energy = WebRtcSpl_DotProductWithScale( pp, pp, lTarget, scale);
/* Normalize the energy and store the number of shifts */
energyShifts[base_size] = (int16_t)WebRtcSpl_NormW32(energy);
tmp32 = WEBRTC_SPL_LSHIFT_W32(energy, energyShifts[base_size]);
energyW16[base_size] = (int16_t)WEBRTC_SPL_RSHIFT_W32(tmp32, 16);
ppi = filteredCB + lMem - 1 - lTarget;
ppo = filteredCB + lMem - 1;
WebRtcIlbcfix_CbMemEnergyCalc(energy, range, ppi, ppo, energyW16, energyShifts, scale, base_size);
}
|
