andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2012 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 | * This file contains the implementation of functions |
| 13 | * WebRtcSpl_MaxAbsValueW16C() |
| 14 | * WebRtcSpl_MaxAbsValueW32C() |
| 15 | * WebRtcSpl_MaxValueW16C() |
| 16 | * WebRtcSpl_MaxValueW32C() |
| 17 | * WebRtcSpl_MinValueW16C() |
| 18 | * WebRtcSpl_MinValueW32C() |
| 19 | * WebRtcSpl_MaxAbsIndexW16() |
| 20 | * WebRtcSpl_MaxIndexW16() |
| 21 | * WebRtcSpl_MaxIndexW32() |
| 22 | * WebRtcSpl_MinIndexW16() |
| 23 | * WebRtcSpl_MinIndexW32() |
| 24 | * |
| 25 | */ |
| 26 | |
pbos@webrtc.org | abf0cd8 | 2013-05-27 09:49:58 +0000 | [diff] [blame] | 27 | #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 28 | |
| 29 | #include <stdlib.h> |
| 30 | |
| 31 | // TODO(bjorn/kma): Consolidate function pairs (e.g. combine |
| 32 | // WebRtcSpl_MaxAbsValueW16C and WebRtcSpl_MaxAbsIndexW16 into a single one.) |
| 33 | // TODO(kma): Move the next six functions into min_max_operations_c.c. |
| 34 | |
| 35 | // Maximum absolute value of word16 vector. C version for generic platforms. |
| 36 | int16_t WebRtcSpl_MaxAbsValueW16C(const int16_t* vector, int length) { |
| 37 | int i = 0, absolute = 0, maximum = 0; |
| 38 | |
| 39 | if (vector == NULL || length <= 0) { |
| 40 | return -1; |
| 41 | } |
| 42 | |
| 43 | for (i = 0; i < length; i++) { |
| 44 | absolute = abs((int)vector[i]); |
| 45 | |
| 46 | if (absolute > maximum) { |
| 47 | maximum = absolute; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | // Guard the case for abs(-32768). |
| 52 | if (maximum > WEBRTC_SPL_WORD16_MAX) { |
| 53 | maximum = WEBRTC_SPL_WORD16_MAX; |
| 54 | } |
| 55 | |
| 56 | return (int16_t)maximum; |
| 57 | } |
| 58 | |
| 59 | // Maximum absolute value of word32 vector. C version for generic platforms. |
| 60 | int32_t WebRtcSpl_MaxAbsValueW32C(const int32_t* vector, int length) { |
| 61 | // Use uint32_t for the local variables, to accommodate the return value |
| 62 | // of abs(0x80000000), which is 0x80000000. |
| 63 | |
| 64 | uint32_t absolute = 0, maximum = 0; |
| 65 | int i = 0; |
| 66 | |
| 67 | if (vector == NULL || length <= 0) { |
| 68 | return -1; |
| 69 | } |
| 70 | |
| 71 | for (i = 0; i < length; i++) { |
| 72 | absolute = abs((int)vector[i]); |
| 73 | if (absolute > maximum) { |
| 74 | maximum = absolute; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | maximum = WEBRTC_SPL_MIN(maximum, WEBRTC_SPL_WORD32_MAX); |
| 79 | |
| 80 | return (int32_t)maximum; |
| 81 | } |
| 82 | |
| 83 | // Maximum value of word16 vector. C version for generic platforms. |
| 84 | int16_t WebRtcSpl_MaxValueW16C(const int16_t* vector, int length) { |
| 85 | int16_t maximum = WEBRTC_SPL_WORD16_MIN; |
| 86 | int i = 0; |
| 87 | |
| 88 | if (vector == NULL || length <= 0) { |
| 89 | return maximum; |
| 90 | } |
| 91 | |
| 92 | for (i = 0; i < length; i++) { |
| 93 | if (vector[i] > maximum) |
| 94 | maximum = vector[i]; |
| 95 | } |
| 96 | return maximum; |
| 97 | } |
| 98 | |
| 99 | // Maximum value of word32 vector. C version for generic platforms. |
| 100 | int32_t WebRtcSpl_MaxValueW32C(const int32_t* vector, int length) { |
| 101 | int32_t maximum = WEBRTC_SPL_WORD32_MIN; |
| 102 | int i = 0; |
| 103 | |
| 104 | if (vector == NULL || length <= 0) { |
| 105 | return maximum; |
| 106 | } |
| 107 | |
| 108 | for (i = 0; i < length; i++) { |
| 109 | if (vector[i] > maximum) |
| 110 | maximum = vector[i]; |
| 111 | } |
| 112 | return maximum; |
| 113 | } |
| 114 | |
| 115 | // Minimum value of word16 vector. C version for generic platforms. |
| 116 | int16_t WebRtcSpl_MinValueW16C(const int16_t* vector, int length) { |
| 117 | int16_t minimum = WEBRTC_SPL_WORD16_MAX; |
| 118 | int i = 0; |
| 119 | |
| 120 | if (vector == NULL || length <= 0) { |
| 121 | return minimum; |
| 122 | } |
| 123 | |
| 124 | for (i = 0; i < length; i++) { |
| 125 | if (vector[i] < minimum) |
| 126 | minimum = vector[i]; |
| 127 | } |
| 128 | return minimum; |
| 129 | } |
| 130 | |
| 131 | // Minimum value of word32 vector. C version for generic platforms. |
| 132 | int32_t WebRtcSpl_MinValueW32C(const int32_t* vector, int length) { |
| 133 | int32_t minimum = WEBRTC_SPL_WORD32_MAX; |
| 134 | int i = 0; |
| 135 | |
| 136 | if (vector == NULL || length <= 0) { |
| 137 | return minimum; |
| 138 | } |
| 139 | |
| 140 | for (i = 0; i < length; i++) { |
| 141 | if (vector[i] < minimum) |
| 142 | minimum = vector[i]; |
| 143 | } |
| 144 | return minimum; |
| 145 | } |
| 146 | |
| 147 | // Index of maximum absolute value in a word16 vector. |
| 148 | int WebRtcSpl_MaxAbsIndexW16(const int16_t* vector, int length) { |
| 149 | // Use type int for local variables, to accomodate the value of abs(-32768). |
| 150 | |
| 151 | int i = 0, absolute = 0, maximum = 0, index = 0; |
| 152 | |
| 153 | if (vector == NULL || length <= 0) { |
| 154 | return -1; |
| 155 | } |
| 156 | |
| 157 | for (i = 0; i < length; i++) { |
| 158 | absolute = abs((int)vector[i]); |
| 159 | |
| 160 | if (absolute > maximum) { |
| 161 | maximum = absolute; |
| 162 | index = i; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | return index; |
| 167 | } |
| 168 | |
| 169 | // Index of maximum value in a word16 vector. |
| 170 | int WebRtcSpl_MaxIndexW16(const int16_t* vector, int length) { |
| 171 | int i = 0, index = 0; |
| 172 | int16_t maximum = WEBRTC_SPL_WORD16_MIN; |
| 173 | |
| 174 | if (vector == NULL || length <= 0) { |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | for (i = 0; i < length; i++) { |
| 179 | if (vector[i] > maximum) { |
| 180 | maximum = vector[i]; |
| 181 | index = i; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | return index; |
| 186 | } |
| 187 | |
| 188 | // Index of maximum value in a word32 vector. |
| 189 | int WebRtcSpl_MaxIndexW32(const int32_t* vector, int length) { |
| 190 | int i = 0, index = 0; |
| 191 | int32_t maximum = WEBRTC_SPL_WORD32_MIN; |
| 192 | |
| 193 | if (vector == NULL || length <= 0) { |
| 194 | return -1; |
| 195 | } |
| 196 | |
| 197 | for (i = 0; i < length; i++) { |
| 198 | if (vector[i] > maximum) { |
| 199 | maximum = vector[i]; |
| 200 | index = i; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | return index; |
| 205 | } |
| 206 | |
| 207 | // Index of minimum value in a word16 vector. |
| 208 | int WebRtcSpl_MinIndexW16(const int16_t* vector, int length) { |
| 209 | int i = 0, index = 0; |
| 210 | int16_t minimum = WEBRTC_SPL_WORD16_MAX; |
| 211 | |
| 212 | if (vector == NULL || length <= 0) { |
| 213 | return -1; |
| 214 | } |
| 215 | |
| 216 | for (i = 0; i < length; i++) { |
| 217 | if (vector[i] < minimum) { |
| 218 | minimum = vector[i]; |
| 219 | index = i; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | return index; |
| 224 | } |
| 225 | |
| 226 | // Index of minimum value in a word32 vector. |
| 227 | int WebRtcSpl_MinIndexW32(const int32_t* vector, int length) { |
| 228 | int i = 0, index = 0; |
| 229 | int32_t minimum = WEBRTC_SPL_WORD32_MAX; |
| 230 | |
| 231 | if (vector == NULL || length <= 0) { |
| 232 | return -1; |
| 233 | } |
| 234 | |
| 235 | for (i = 0; i < length; i++) { |
| 236 | if (vector[i] < minimum) { |
| 237 | minimum = vector[i]; |
| 238 | index = i; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | return index; |
| 243 | } |