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

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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: 2.2 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_LpcEncode.c
16
17******************************************************************/
18
19#include "defines.h"
20#include "simple_lpc_analysis.h"
21#include "simple_interpolate_lsf.h"
22#include "simple_lsf_quant.h"
23#include "lsf_check.h"
24#include "constants.h"
25
26/*----------------------------------------------------------------*
27 *  lpc encoder
28 *---------------------------------------------------------------*/
29
30void WebRtcIlbcfix_LpcEncode(
31    int16_t *syntdenum,  /* (i/o) synthesis filter coefficients
32                                           before/after encoding */
33    int16_t *weightdenum, /* (i/o) weighting denumerator coefficients
34                                   before/after encoding */
35    int16_t *lsf_index,  /* (o) lsf quantization index */
36    int16_t *data,   /* (i) Speech to do LPC analysis on */
37    iLBC_Enc_Inst_t *iLBCenc_inst
38    /* (i/o) the encoder state structure */
39                              ) {
40  /* Stack based */
41  int16_t lsf[LPC_FILTERORDER * LPC_N_MAX];
42  int16_t lsfdeq[LPC_FILTERORDER * LPC_N_MAX];
43
44  /* Calculate LSF's from the input speech */
45  WebRtcIlbcfix_SimpleLpcAnalysis(lsf, data, iLBCenc_inst);
46
47  /* Quantize the LSF's */
48  WebRtcIlbcfix_SimpleLsfQ(lsfdeq, lsf_index, lsf, iLBCenc_inst->lpc_n);
49
50  /* Stableize the LSF's if needed */
51  WebRtcIlbcfix_LsfCheck(lsfdeq, LPC_FILTERORDER, iLBCenc_inst->lpc_n);
52
53  /* Calculate the synthesis and weighting filter coefficients from
54     the optimal LSF and the dequantized LSF */
55  WebRtcIlbcfix_SimpleInterpolateLsf(syntdenum, weightdenum,
56                                     lsf, lsfdeq, iLBCenc_inst->lsfold,
57                                     iLBCenc_inst->lsfdeqold, LPC_FILTERORDER, iLBCenc_inst);
58
59  return;
60}
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