1 /* 2 ** Copyright 2003-2010, VisualOn, Inc. 3 ** 4 ** Licensed under the Apache License, Version 2.0 (the "License"); 5 ** you may not use this file except in compliance with the License. 6 ** You may obtain a copy of the License at 7 ** 8 ** http://www.apache.org/licenses/LICENSE-2.0 9 ** 10 ** Unless required by applicable law or agreed to in writing, software 11 ** distributed under the License is distributed on an "AS IS" BASIS, 12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 ** See the License for the specific language governing permissions and 14 ** limitations under the License. 15 */ 16 17 /*************************************************************************** 18 * File: qisf_ns.c * 19 * * 20 * Description: Coding/Decoding of ISF parameters for background noise.* 21 * The ISF vector is quantized using VQ with split-by-5 * 22 * * 23 ****************************************************************************/ 24 25 #include "typedef.h" 26 #include "basic_op.h" 27 #include "acelp.h" 28 #include "qisf_ns.tab" /* Codebooks of ISFs */ 29 30 /*------------------------------------------------------------------* 31 * routine: Qisf_ns() * 32 * ~~~~~~~~~ * 33 *------------------------------------------------------------------*/ 34 35 void Qisf_ns( 36 Word16 * isf1, /* input : ISF in the frequency domain (0..0.5) */ 37 Word16 * isf_q, /* output: quantized ISF */ 38 Word16 * indice /* output: quantization indices */ 39 ) 40 { 41 Word16 i; 42 Word32 tmp; 43 44 for (i = 0; i < ORDER; i++) 45 { 46 isf_q[i] = sub(isf1[i], mean_isf_noise[i]); 47 } 48 49 indice[0] = Sub_VQ(&isf_q[0], dico1_isf_noise, 2, SIZE_BK_NOISE1, &tmp); 50 indice[1] = Sub_VQ(&isf_q[2], dico2_isf_noise, 3, SIZE_BK_NOISE2, &tmp); 51 indice[2] = Sub_VQ(&isf_q[5], dico3_isf_noise, 3, SIZE_BK_NOISE3, &tmp); 52 indice[3] = Sub_VQ(&isf_q[8], dico4_isf_noise, 4, SIZE_BK_NOISE4, &tmp); 53 indice[4] = Sub_VQ(&isf_q[12], dico5_isf_noise, 4, SIZE_BK_NOISE5, &tmp); 54 55 /* decoding the ISFs */ 56 57 Disf_ns(indice, isf_q); 58 59 return; 60 } 61 62 /******************************************************************** 63 * Function: Disf_ns() * 64 * ~~~~~~~~~ * 65 * Decoding of ISF parameters * 66 *-------------------------------------------------------------------* 67 * Arguments: * 68 * indice[] : indices of the selected codebook entries * 69 * isf[] : quantized ISFs (in frequency domain) * 70 *********************************************************************/ 71 72 void Disf_ns( 73 Word16 * indice, /* input: quantization indices */ 74 Word16 * isf_q /* input : ISF in the frequency domain (0..0.5) */ 75 ) 76 { 77 Word16 i; 78 79 for (i = 0; i < 2; i++) 80 { 81 isf_q[i] = dico1_isf_noise[indice[0] * 2 + i]; 82 } 83 for (i = 0; i < 3; i++) 84 { 85 isf_q[i + 2] = dico2_isf_noise[indice[1] * 3 + i]; 86 } 87 for (i = 0; i < 3; i++) 88 { 89 isf_q[i + 5] = dico3_isf_noise[indice[2] * 3 + i]; 90 } 91 for (i = 0; i < 4; i++) 92 { 93 isf_q[i + 8] = dico4_isf_noise[indice[3] * 4 + i]; 94 } 95 for (i = 0; i < 4; i++) 96 { 97 isf_q[i + 12] = dico5_isf_noise[indice[4] * 4 + i]; 98 } 99 100 for (i = 0; i < ORDER; i++) 101 { 102 isf_q[i] = add(isf_q[i], mean_isf_noise[i]); 103 } 104 105 Reorder_isf(isf_q, ISF_GAP, ORDER); 106 107 return; 108 } 109 110 111 112
