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/*
* 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_FilteredCbVecs.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/filtered_cb_vecs.h"
#include "modules/audio_coding/codecs/ilbc/constants.h"
#include "modules/audio_coding/codecs/ilbc/defines.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(
int16_t *cbvectors, /* (o) Codebook vector for the higher section */
int16_t *CBmem, /* (i) Codebook memory that is filtered to create a
second CB section */
size_t lMem, /* (i) Length of codebook memory */
size_t samples /* (i) Number of samples to filter */
) {
/* Set up the memory, start with zero state */
WebRtcSpl_MemSetW16(CBmem+lMem, 0, CB_HALFFILTERLEN);
WebRtcSpl_MemSetW16(CBmem-CB_HALFFILTERLEN, 0, CB_HALFFILTERLEN);
WebRtcSpl_MemSetW16(cbvectors, 0, lMem-samples);
/* Filter to obtain the filtered CB memory */
WebRtcSpl_FilterMAFastQ12(
CBmem+CB_HALFFILTERLEN+lMem-samples, cbvectors+lMem-samples,
(int16_t*)WebRtcIlbcfix_kCbFiltersRev, CB_FILTERLEN, samples);
return;
}
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