blob: 7cece268d9a60cd7e17de0ad52da37ff2fc16cd7 [file] [log] [blame]
* 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
#include "defines.h"
#include "constants.h"
* Construct an additional codebook vector by filtering the
* initial codebook buffer. This vector is then used to expand
* the codebook with an additional section.
void WebRtcIlbcfix_FilteredCbVecs(
WebRtc_Word16 *cbvectors, /* (o) Codebook vector for the higher section */
WebRtc_Word16 *CBmem, /* (i) Codebook memory that is filtered to create a
second CB section */
int lMem, /* (i) Length of codebook memory */
WebRtc_Word16 samples /* (i) Number of samples to filter */
) {
/* Set up the memory, start with zero state */
WebRtcSpl_MemSetW16(CBmem+lMem, 0, CB_HALFFILTERLEN);
WebRtcSpl_MemSetW16(cbvectors, 0, lMem-samples);
/* Filter to obtain the filtered CB memory */
CBmem+CB_HALFFILTERLEN+lMem-samples, cbvectors+lMem-samples,
(WebRtc_Word16*)WebRtcIlbcfix_kCbFiltersRev, CB_FILTERLEN, samples);