94 строки
2.3 KiB
C
94 строки
2.3 KiB
C
/*
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* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vp9/common/vp9_common.h"
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#include "vpx_ports/mem.h"
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unsigned int vp9_avg_8x8_c(const uint8_t *s, int p) {
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int i, j;
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int sum = 0;
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for (i = 0; i < 8; ++i, s+=p)
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for (j = 0; j < 8; sum += s[j], ++j) {}
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return (sum + 32) >> 6;
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}
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unsigned int vp9_avg_4x4_c(const uint8_t *s, int p) {
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int i, j;
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int sum = 0;
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for (i = 0; i < 4; ++i, s+=p)
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for (j = 0; j < 4; sum += s[j], ++j) {}
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return (sum + 8) >> 4;
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}
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// Integer projection onto row vectors.
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void vp9_int_pro_row_c(int16_t *hbuf, uint8_t const *ref,
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const int ref_stride, const int height) {
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int idx;
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const int norm_factor = MAX(8, height >> 1);
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for (idx = 0; idx < 16; ++idx) {
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int i;
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hbuf[idx] = 0;
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for (i = 0; i < height; ++i)
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hbuf[idx] += ref[i * ref_stride];
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hbuf[idx] /= norm_factor;
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++ref;
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}
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}
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int16_t vp9_int_pro_col_c(uint8_t const *ref, const int width) {
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int idx;
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int16_t sum = 0;
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const int norm_factor = MAX(8, width >> 1);
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for (idx = 0; idx < width; ++idx)
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sum += ref[idx];
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return sum / norm_factor;
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}
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int vp9_vector_var_c(int16_t const *ref, int16_t const *src,
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const int bwl) {
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int i;
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int width = 4 << bwl;
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int sse = 0, mean = 0, var;
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for (i = 0; i < width; ++i) {
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int diff = ref[i] - src[i];
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mean += diff;
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sse += diff * diff;
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}
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var = sse - ((mean * mean) >> (bwl + 2));
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return var;
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}
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#if CONFIG_VP9_HIGHBITDEPTH
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unsigned int vp9_highbd_avg_8x8_c(const uint8_t *s8, int p) {
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int i, j;
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int sum = 0;
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const uint16_t* s = CONVERT_TO_SHORTPTR(s8);
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for (i = 0; i < 8; ++i, s+=p)
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for (j = 0; j < 8; sum += s[j], ++j) {}
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return (sum + 32) >> 6;
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}
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unsigned int vp9_highbd_avg_4x4_c(const uint8_t *s8, int p) {
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int i, j;
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int sum = 0;
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const uint16_t* s = CONVERT_TO_SHORTPTR(s8);
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for (i = 0; i < 4; ++i, s+=p)
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for (j = 0; j < 4; sum += s[j], ++j) {}
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return (sum + 8) >> 4;
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}
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#endif // CONFIG_VP9_HIGHBITDEPTH
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