1b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/* 2b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * 4b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Use of this source code is governed by a BSD-style license 5b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * that can be found in the LICENSE file in the root of the source 6b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * tree. An additional intellectual property rights grant can be found 7b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * in the file PATENTS. All contributing project authors may 8b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * be found in the AUTHORS file in the root of the source tree. 9b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org */ 10b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 11b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/****************************************************************** 12b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 13b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org iLBC Speech Coder ANSI-C Source Code 14b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 15b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcIlbcfix_FilteredCbVecs.c 16b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 17b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org******************************************************************/ 18b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 19b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "defines.h" 20b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#include "constants.h" 21b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 22b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/*----------------------------------------------------------------* 23b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Construct an additional codebook vector by filtering the 24b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * initial codebook buffer. This vector is then used to expand 25b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * the codebook with an additional section. 26b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org *---------------------------------------------------------------*/ 27b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 28b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.orgvoid WebRtcIlbcfix_FilteredCbVecs( 29fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *cbvectors, /* (o) Codebook vector for the higher section */ 30fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t *CBmem, /* (i) Codebook memory that is filtered to create a 31b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org second CB section */ 32b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org int lMem, /* (i) Length of codebook memory */ 33fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org int16_t samples /* (i) Number of samples to filter */ 34b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org ) { 35b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 36b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Set up the memory, start with zero state */ 37b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_MemSetW16(CBmem+lMem, 0, CB_HALFFILTERLEN); 38b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_MemSetW16(CBmem-CB_HALFFILTERLEN, 0, CB_HALFFILTERLEN); 39b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_MemSetW16(cbvectors, 0, lMem-samples); 40b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 41b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org /* Filter to obtain the filtered CB memory */ 42b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 43b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org WebRtcSpl_FilterMAFastQ12( 44b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org CBmem+CB_HALFFILTERLEN+lMem-samples, cbvectors+lMem-samples, 45fbda0fcf2f9e82c82bcaac138f44d4e5144f6e0dpbos@webrtc.org (int16_t*)WebRtcIlbcfix_kCbFiltersRev, CB_FILTERLEN, samples); 46b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 47b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org return; 48b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org} 49