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_GetCbVec.c 16 17 ******************************************************************/ 18 19 #include "defines.h" 20 #include "constants.h" 21 #include "create_augmented_vec.h" 22 23 /*----------------------------------------------------------------* 24 * Construct codebook vector for given index. 25 *---------------------------------------------------------------*/ 26 27 void WebRtcIlbcfix_GetCbVec( 28 int16_t *cbvec, /* (o) Constructed codebook vector */ 29 int16_t *mem, /* (i) Codebook buffer */ 30 size_t index, /* (i) Codebook index */ 31 size_t lMem, /* (i) Length of codebook buffer */ 32 size_t cbveclen /* (i) Codebook vector length */ 33 ){ 34 size_t k, base_size; 35 size_t lag; 36 /* Stack based */ 37 int16_t tempbuff2[SUBL+5]; 38 39 /* Determine size of codebook sections */ 40 41 base_size=lMem-cbveclen+1; 42 43 if (cbveclen==SUBL) { 44 base_size += cbveclen / 2; 45 } 46 47 /* No filter -> First codebook section */ 48 49 if (index<lMem-cbveclen+1) { 50 51 /* first non-interpolated vectors */ 52 53 k=index+cbveclen; 54 /* get vector */ 55 WEBRTC_SPL_MEMCPY_W16(cbvec, mem+lMem-k, cbveclen); 56 57 } else if (index < base_size) { 58 59 /* Calculate lag */ 60 61 k = (2 * (index - (lMem - cbveclen + 1))) + cbveclen; 62 63 lag = k / 2; 64 65 WebRtcIlbcfix_CreateAugmentedVec(lag, mem+lMem, cbvec); 66 67 } 68 69 /* Higher codebbok section based on filtering */ 70 71 else { 72 73 size_t memIndTest; 74 75 /* first non-interpolated vectors */ 76 77 if (index-base_size<lMem-cbveclen+1) { 78 79 /* Set up filter memory, stuff zeros outside memory buffer */ 80 81 memIndTest = lMem-(index-base_size+cbveclen); 82 83 WebRtcSpl_MemSetW16(mem-CB_HALFFILTERLEN, 0, CB_HALFFILTERLEN); 84 WebRtcSpl_MemSetW16(mem+lMem, 0, CB_HALFFILTERLEN); 85 86 /* do filtering to get the codebook vector */ 87 88 WebRtcSpl_FilterMAFastQ12( 89 &mem[memIndTest+4], cbvec, (int16_t*)WebRtcIlbcfix_kCbFiltersRev, 90 CB_FILTERLEN, cbveclen); 91 } 92 93 /* interpolated vectors */ 94 95 else { 96 /* Stuff zeros outside memory buffer */ 97 memIndTest = lMem-cbveclen-CB_FILTERLEN; 98 WebRtcSpl_MemSetW16(mem+lMem, 0, CB_HALFFILTERLEN); 99 100 /* do filtering */ 101 WebRtcSpl_FilterMAFastQ12( 102 &mem[memIndTest+7], tempbuff2, (int16_t*)WebRtcIlbcfix_kCbFiltersRev, 103 CB_FILTERLEN, cbveclen+5); 104 105 /* Calculate lag index */ 106 lag = (cbveclen<<1)-20+index-base_size-lMem-1; 107 108 WebRtcIlbcfix_CreateAugmentedVec(lag, tempbuff2+SUBL+5, cbvec); 109 } 110 } 111 } 112