1 /*********************************************************************** 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3 Redistribution and use in source and binary forms, with or without 4 modification, are permitted provided that the following conditions 5 are met: 6 - Redistributions of source code must retain the above copyright notice, 7 this list of conditions and the following disclaimer. 8 - Redistributions in binary form must reproduce the above copyright 9 notice, this list of conditions and the following disclaimer in the 10 documentation and/or other materials provided with the distribution. 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the 12 names of specific contributors, may be used to endorse or promote 13 products derived from this software without specific prior written 14 permission. 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 POSSIBILITY OF SUCH DAMAGE. 26 ***********************************************************************/ 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 /* Insertion sort (fast for already almost sorted arrays): */ 33 /* Best case: O(n) for an already sorted array */ 34 /* Worst case: O(n^2) for an inversely sorted array */ 35 /* */ 36 /* Shell short: https://en.wikipedia.org/wiki/Shell_sort */ 37 38 #include "SigProc_FIX.h" 39 40 void silk_insertion_sort_increasing( 41 opus_int32 *a, /* I/O Unsorted / Sorted vector */ 42 opus_int *idx, /* O Index vector for the sorted elements */ 43 const opus_int L, /* I Vector length */ 44 const opus_int K /* I Number of correctly sorted positions */ 45 ) 46 { 47 opus_int32 value; 48 opus_int i, j; 49 50 /* Safety checks */ 51 celt_assert( K > 0 ); 52 celt_assert( L > 0 ); 53 celt_assert( L >= K ); 54 55 /* Write start indices in index vector */ 56 for( i = 0; i < K; i++ ) { 57 idx[ i ] = i; 58 } 59 60 /* Sort vector elements by value, increasing order */ 61 for( i = 1; i < K; i++ ) { 62 value = a[ i ]; 63 for( j = i - 1; ( j >= 0 ) && ( value < a[ j ] ); j-- ) { 64 a[ j + 1 ] = a[ j ]; /* Shift value */ 65 idx[ j + 1 ] = idx[ j ]; /* Shift index */ 66 } 67 a[ j + 1 ] = value; /* Write value */ 68 idx[ j + 1 ] = i; /* Write index */ 69 } 70 71 /* If less than L values are asked for, check the remaining values, */ 72 /* but only spend CPU to ensure that the K first values are correct */ 73 for( i = K; i < L; i++ ) { 74 value = a[ i ]; 75 if( value < a[ K - 1 ] ) { 76 for( j = K - 2; ( j >= 0 ) && ( value < a[ j ] ); j-- ) { 77 a[ j + 1 ] = a[ j ]; /* Shift value */ 78 idx[ j + 1 ] = idx[ j ]; /* Shift index */ 79 } 80 a[ j + 1 ] = value; /* Write value */ 81 idx[ j + 1 ] = i; /* Write index */ 82 } 83 } 84 } 85 86 #ifdef FIXED_POINT 87 /* This function is only used by the fixed-point build */ 88 void silk_insertion_sort_decreasing_int16( 89 opus_int16 *a, /* I/O Unsorted / Sorted vector */ 90 opus_int *idx, /* O Index vector for the sorted elements */ 91 const opus_int L, /* I Vector length */ 92 const opus_int K /* I Number of correctly sorted positions */ 93 ) 94 { 95 opus_int i, j; 96 opus_int value; 97 98 /* Safety checks */ 99 celt_assert( K > 0 ); 100 celt_assert( L > 0 ); 101 celt_assert( L >= K ); 102 103 /* Write start indices in index vector */ 104 for( i = 0; i < K; i++ ) { 105 idx[ i ] = i; 106 } 107 108 /* Sort vector elements by value, decreasing order */ 109 for( i = 1; i < K; i++ ) { 110 value = a[ i ]; 111 for( j = i - 1; ( j >= 0 ) && ( value > a[ j ] ); j-- ) { 112 a[ j + 1 ] = a[ j ]; /* Shift value */ 113 idx[ j + 1 ] = idx[ j ]; /* Shift index */ 114 } 115 a[ j + 1 ] = value; /* Write value */ 116 idx[ j + 1 ] = i; /* Write index */ 117 } 118 119 /* If less than L values are asked for, check the remaining values, */ 120 /* but only spend CPU to ensure that the K first values are correct */ 121 for( i = K; i < L; i++ ) { 122 value = a[ i ]; 123 if( value > a[ K - 1 ] ) { 124 for( j = K - 2; ( j >= 0 ) && ( value > a[ j ] ); j-- ) { 125 a[ j + 1 ] = a[ j ]; /* Shift value */ 126 idx[ j + 1 ] = idx[ j ]; /* Shift index */ 127 } 128 a[ j + 1 ] = value; /* Write value */ 129 idx[ j + 1 ] = i; /* Write index */ 130 } 131 } 132 } 133 #endif 134 135 void silk_insertion_sort_increasing_all_values_int16( 136 opus_int16 *a, /* I/O Unsorted / Sorted vector */ 137 const opus_int L /* I Vector length */ 138 ) 139 { 140 opus_int value; 141 opus_int i, j; 142 143 /* Safety checks */ 144 celt_assert( L > 0 ); 145 146 /* Sort vector elements by value, increasing order */ 147 for( i = 1; i < L; i++ ) { 148 value = a[ i ]; 149 for( j = i - 1; ( j >= 0 ) && ( value < a[ j ] ); j-- ) { 150 a[ j + 1 ] = a[ j ]; /* Shift value */ 151 } 152 a[ j + 1 ] = value; /* Write value */ 153 } 154 } 155
