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comparison: media/libyuv/source/compare_common.cc
media/libyuv/source/compare_common.cc
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| -1:000000000000 | 0:a138b5b45589 |
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| 1 /* | |
| 2 * Copyright 2012 The LibYuv 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 #include "libyuv/basic_types.h" | |
| 12 | |
| 13 #ifdef __cplusplus | |
| 14 namespace libyuv { | |
| 15 extern "C" { | |
| 16 #endif | |
| 17 | |
| 18 uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count) { | |
| 19 uint32 sse = 0u; | |
| 20 int i; | |
| 21 for (i = 0; i < count; ++i) { | |
| 22 int diff = src_a[i] - src_b[i]; | |
| 23 sse += (uint32)(diff * diff); | |
| 24 } | |
| 25 return sse; | |
| 26 } | |
| 27 | |
| 28 // hash seed of 5381 recommended. | |
| 29 // Internal C version of HashDjb2 with int sized count for efficiency. | |
| 30 uint32 HashDjb2_C(const uint8* src, int count, uint32 seed) { | |
| 31 uint32 hash = seed; | |
| 32 int i; | |
| 33 for (i = 0; i < count; ++i) { | |
| 34 hash += (hash << 5) + src[i]; | |
| 35 } | |
| 36 return hash; | |
| 37 } | |
| 38 | |
| 39 #ifdef __cplusplus | |
| 40 } // extern "C" | |
| 41 } // namespace libyuv | |
| 42 #endif |
