ref: 93da1ba2dc1c8b8af5c266d502fdbafa5dfef55a
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