| /* |
| * 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/defines.h" |
| #include "modules/audio_coding/codecs/ilbc/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( |
| 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; |
| } |