ref: cb63aefa4527dbde62abcc4c7f8b5bef40a8cf6b
dir: /vpx_dsp/avg.c/
/*
* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdlib.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_ports/mem.h"
unsigned int vpx_avg_8x8_c(const uint8_t *s, int p) {
int i, j;
int sum = 0;
for (i = 0; i < 8; ++i, s += p)
for (j = 0; j < 8; sum += s[j], ++j) {
}
return (sum + 32) >> 6;
}
unsigned int vpx_avg_4x4_c(const uint8_t *s, int p) {
int i, j;
int sum = 0;
for (i = 0; i < 4; ++i, s += p)
for (j = 0; j < 4; sum += s[j], ++j) {
}
return (sum + 8) >> 4;
}
// src_diff: first pass, 9 bit, dynamic range [-255, 255]
// second pass, 12 bit, dynamic range [-2040, 2040]
static void hadamard_col8(const int16_t *src_diff, ptrdiff_t src_stride,
int16_t *coeff) {
int16_t b0 = src_diff[0 * src_stride] + src_diff[1 * src_stride];
int16_t b1 = src_diff[0 * src_stride] - src_diff[1 * src_stride];
int16_t b2 = src_diff[2 * src_stride] + src_diff[3 * src_stride];
int16_t b3 = src_diff[2 * src_stride] - src_diff[3 * src_stride];
int16_t b4 = src_diff[4 * src_stride] + src_diff[5 * src_stride];
int16_t b5 = src_diff[4 * src_stride] - src_diff[5 * src_stride];
int16_t b6 = src_diff[6 * src_stride] + src_diff[7 * src_stride];
int16_t b7 = src_diff[6 * src_stride] - src_diff[7 * src_stride];
int16_t c0 = b0 + b2;
int16_t c1 = b1 + b3;
int16_t c2 = b0 - b2;
int16_t c3 = b1 - b3;
int16_t c4 = b4 + b6;
int16_t c5 = b5 + b7;
int16_t c6 = b4 - b6;
int16_t c7 = b5 - b7;
coeff[0] = c0 + c4;
coeff[7] = c1 + c5;
coeff[3] = c2 + c6;
coeff[4] = c3 + c7;
coeff[2] = c0 - c4;
coeff[6] = c1 - c5;
coeff[1] = c2 - c6;
coeff[5] = c3 - c7;
}
// The order of the output coeff of the hadamard is not important. For
// optimization purposes the final transpose may be skipped.
void vpx_hadamard_8x8_c(const int16_t *src_diff, ptrdiff_t src_stride,
tran_low_t *coeff) {
int idx;
int16_t buffer[64];
int16_t buffer2[64];
int16_t *tmp_buf = &buffer[0];
for (idx = 0; idx < 8; ++idx) {
hadamard_col8(src_diff, src_stride, tmp_buf); // src_diff: 9 bit
// dynamic range [-255, 255]
tmp_buf += 8;
++src_diff;
}
tmp_buf = &buffer[0];
for (idx = 0; idx < 8; ++idx) {
hadamard_col8(tmp_buf, 8, buffer2 + 8 * idx); // tmp_buf: 12 bit
// dynamic range [-2040, 2040]
// buffer2: 15 bit
// dynamic range [-16320, 16320]
++tmp_buf;
}
for (idx = 0; idx < 64; ++idx) coeff[idx] = (tran_low_t)buffer2[idx];
}
// In place 16x16 2D Hadamard transform
void vpx_hadamard_16x16_c(const int16_t *src_diff, ptrdiff_t src_stride,
tran_low_t *coeff) {
int idx;
for (idx = 0; idx < 4; ++idx) {
// src_diff: 9 bit, dynamic range [-255, 255]
const int16_t *src_ptr =
src_diff + (idx >> 1) * 8 * src_stride + (idx & 0x01) * 8;
vpx_hadamard_8x8_c(src_ptr, src_stride, coeff + idx * 64);
}
// coeff: 15 bit, dynamic range [-16320, 16320]
for (idx = 0; idx < 64; ++idx) {
tran_low_t a0 = coeff[0];
tran_low_t a1 = coeff[64];
tran_low_t a2 = coeff[128];
tran_low_t a3 = coeff[192];
tran_low_t b0 = (a0 + a1) >> 1; // (a0 + a1): 16 bit, [-32640, 32640]
tran_low_t b1 = (a0 - a1) >> 1; // b0-b3: 15 bit, dynamic range
tran_low_t b2 = (a2 + a3) >> 1; // [-16320, 16320]
tran_low_t b3 = (a2 - a3) >> 1;
coeff[0] = b0 + b2; // 16 bit, [-32640, 32640]
coeff[64] = b1 + b3;
coeff[128] = b0 - b2;
coeff[192] = b1 - b3;
++coeff;
}
}
// coeff: 16 bits, dynamic range [-32640, 32640].
// length: value range {16, 64, 256, 1024}.
int vpx_satd_c(const tran_low_t *coeff, int length) {
int i;
int satd = 0;
for (i = 0; i < length; ++i) satd += abs(coeff[i]);
// satd: 26 bits, dynamic range [-32640 * 1024, 32640 * 1024]
return satd;
}
// Integer projection onto row vectors.
// height: value range {16, 32, 64}.
void vpx_int_pro_row_c(int16_t hbuf[16], const uint8_t *ref,
const int ref_stride, const int height) {
int idx;
const int norm_factor = height >> 1;
for (idx = 0; idx < 16; ++idx) {
int i;
hbuf[idx] = 0;
// hbuf[idx]: 14 bit, dynamic range [0, 16320].
for (i = 0; i < height; ++i) hbuf[idx] += ref[i * ref_stride];
// hbuf[idx]: 9 bit, dynamic range [0, 510].
hbuf[idx] /= norm_factor;
++ref;
}
}
// width: value range {16, 32, 64}.
int16_t vpx_int_pro_col_c(const uint8_t *ref, const int width) {
int idx;
int16_t sum = 0;
// sum: 14 bit, dynamic range [0, 16320]
for (idx = 0; idx < width; ++idx) sum += ref[idx];
return sum;
}
// ref: [0 - 510]
// src: [0 - 510]
// bwl: {2, 3, 4}
int vpx_vector_var_c(const int16_t *ref, const int16_t *src, const int bwl) {
int i;
int width = 4 << bwl;
int sse = 0, mean = 0, var;
for (i = 0; i < width; ++i) {
int diff = ref[i] - src[i]; // diff: dynamic range [-510, 510], 10 bits.
mean += diff; // mean: dynamic range 16 bits.
sse += diff * diff; // sse: dynamic range 26 bits.
}
// (mean * mean): dynamic range 31 bits.
var = sse - ((mean * mean) >> (bwl + 2));
return var;
}
void vpx_minmax_8x8_c(const uint8_t *s, int p, const uint8_t *d, int dp,
int *min, int *max) {
int i, j;
*min = 255;
*max = 0;
for (i = 0; i < 8; ++i, s += p, d += dp) {
for (j = 0; j < 8; ++j) {
int diff = abs(s[j] - d[j]);
*min = diff < *min ? diff : *min;
*max = diff > *max ? diff : *max;
}
}
}
#if CONFIG_VP9_HIGHBITDEPTH
unsigned int vpx_highbd_avg_8x8_c(const uint8_t *s8, int p) {
int i, j;
int sum = 0;
const uint16_t *s = CONVERT_TO_SHORTPTR(s8);
for (i = 0; i < 8; ++i, s += p)
for (j = 0; j < 8; sum += s[j], ++j) {
}
return (sum + 32) >> 6;
}
unsigned int vpx_highbd_avg_4x4_c(const uint8_t *s8, int p) {
int i, j;
int sum = 0;
const uint16_t *s = CONVERT_TO_SHORTPTR(s8);
for (i = 0; i < 4; ++i, s += p)
for (j = 0; j < 4; sum += s[j], ++j) {
}
return (sum + 8) >> 4;
}
void vpx_highbd_minmax_8x8_c(const uint8_t *s8, int p, const uint8_t *d8,
int dp, int *min, int *max) {
int i, j;
const uint16_t *s = CONVERT_TO_SHORTPTR(s8);
const uint16_t *d = CONVERT_TO_SHORTPTR(d8);
*min = 255;
*max = 0;
for (i = 0; i < 8; ++i, s += p, d += dp) {
for (j = 0; j < 8; ++j) {
int diff = abs(s[j] - d[j]);
*min = diff < *min ? diff : *min;
*max = diff > *max ? diff : *max;
}
}
}
#endif // CONFIG_VP9_HIGHBITDEPTH