ref: d9ca52452bff9481ec1ed4684985a86fb7fc3c3e
dir: /vp8/common/variance_c.c/
/* * Copyright (c) 2010 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 "variance.h" #include "filter.h" unsigned int vp8_get_mb_ss_c ( const short *src_ptr ) { unsigned int i = 0, sum = 0; do { sum += (src_ptr[i] * src_ptr[i]); i++; } while (i < 256); return sum; } static void variance( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, int w, int h, unsigned int *sse, int *sum) { int i, j; int diff; *sum = 0; *sse = 0; for (i = 0; i < h; i++) { for (j = 0; j < w; j++) { diff = src_ptr[j] - ref_ptr[j]; *sum += diff; *sse += diff * diff; } src_ptr += source_stride; ref_ptr += recon_stride; } } unsigned int vp8_variance16x16_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { unsigned int var; int avg; variance(src_ptr, source_stride, ref_ptr, recon_stride, 16, 16, &var, &avg); *sse = var; return (var - ((unsigned int)(avg * avg) >> 8)); } unsigned int vp8_variance8x16_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { unsigned int var; int avg; variance(src_ptr, source_stride, ref_ptr, recon_stride, 8, 16, &var, &avg); *sse = var; return (var - ((unsigned int)(avg * avg) >> 7)); } unsigned int vp8_variance16x8_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { unsigned int var; int avg; variance(src_ptr, source_stride, ref_ptr, recon_stride, 16, 8, &var, &avg); *sse = var; return (var - ((unsigned int)(avg * avg) >> 7)); } unsigned int vp8_variance8x8_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { unsigned int var; int avg; variance(src_ptr, source_stride, ref_ptr, recon_stride, 8, 8, &var, &avg); *sse = var; return (var - ((unsigned int)(avg * avg) >> 6)); } unsigned int vp8_variance4x4_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { unsigned int var; int avg; variance(src_ptr, source_stride, ref_ptr, recon_stride, 4, 4, &var, &avg); *sse = var; return (var - ((unsigned int)(avg * avg) >> 4)); } unsigned int vp8_mse16x16_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { unsigned int var; int avg; variance(src_ptr, source_stride, ref_ptr, recon_stride, 16, 16, &var, &avg); *sse = var; return var; } /**************************************************************************** * * ROUTINE : filter_block2d_bil_first_pass * * INPUTS : UINT8 *src_ptr : Pointer to source block. * UINT32 src_pixels_per_line : Stride of input block. * UINT32 pixel_step : Offset between filter input samples (see notes). * UINT32 output_height : Input block height. * UINT32 output_width : Input block width. * INT32 *vp8_filter : Array of 2 bi-linear filter taps. * * OUTPUTS : INT32 *output_ptr : Pointer to filtered block. * * RETURNS : void * * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block in * either horizontal or vertical direction to produce the * filtered output block. Used to implement first-pass * of 2-D separable filter. * * SPECIAL NOTES : Produces INT32 output to retain precision for next pass. * Two filter taps should sum to VP8_FILTER_WEIGHT. * pixel_step defines whether the filter is applied * horizontally (pixel_step=1) or vertically (pixel_step=stride). * It defines the offset required to move from one input * to the next. * ****************************************************************************/ static void var_filter_block2d_bil_first_pass ( const unsigned char *src_ptr, unsigned short *output_ptr, unsigned int src_pixels_per_line, int pixel_step, unsigned int output_height, unsigned int output_width, const short *vp8_filter ) { unsigned int i, j; for (i = 0; i < output_height; i++) { for (j = 0; j < output_width; j++) { // Apply bilinear filter output_ptr[j] = (((int)src_ptr[0] * vp8_filter[0]) + ((int)src_ptr[pixel_step] * vp8_filter[1]) + (VP8_FILTER_WEIGHT / 2)) >> VP8_FILTER_SHIFT; src_ptr++; } // Next row... src_ptr += src_pixels_per_line - output_width; output_ptr += output_width; } } /**************************************************************************** * * ROUTINE : filter_block2d_bil_second_pass * * INPUTS : INT32 *src_ptr : Pointer to source block. * UINT32 src_pixels_per_line : Stride of input block. * UINT32 pixel_step : Offset between filter input samples (see notes). * UINT32 output_height : Input block height. * UINT32 output_width : Input block width. * INT32 *vp8_filter : Array of 2 bi-linear filter taps. * * OUTPUTS : UINT16 *output_ptr : Pointer to filtered block. * * RETURNS : void * * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block in * either horizontal or vertical direction to produce the * filtered output block. Used to implement second-pass * of 2-D separable filter. * * SPECIAL NOTES : Requires 32-bit input as produced by filter_block2d_bil_first_pass. * Two filter taps should sum to VP8_FILTER_WEIGHT. * pixel_step defines whether the filter is applied * horizontally (pixel_step=1) or vertically (pixel_step=stride). * It defines the offset required to move from one input * to the next. * ****************************************************************************/ static void var_filter_block2d_bil_second_pass ( const unsigned short *src_ptr, unsigned char *output_ptr, unsigned int src_pixels_per_line, unsigned int pixel_step, unsigned int output_height, unsigned int output_width, const short *vp8_filter ) { unsigned int i, j; int Temp; for (i = 0; i < output_height; i++) { for (j = 0; j < output_width; j++) { // Apply filter Temp = ((int)src_ptr[0] * vp8_filter[0]) + ((int)src_ptr[pixel_step] * vp8_filter[1]) + (VP8_FILTER_WEIGHT / 2); output_ptr[j] = (unsigned int)(Temp >> VP8_FILTER_SHIFT); src_ptr++; } // Next row... src_ptr += src_pixels_per_line - output_width; output_ptr += output_width; } } unsigned int vp8_sub_pixel_variance4x4_c ( const unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, const unsigned char *dst_ptr, int dst_pixels_per_line, unsigned int *sse ) { unsigned char temp2[20*16]; const short *HFilter, *VFilter; unsigned short FData3[5*4]; // Temp data bufffer used in filtering HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; // First filter 1d Horizontal var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 5, 4, HFilter); // Now filter Verticaly var_filter_block2d_bil_second_pass(FData3, temp2, 4, 4, 4, 4, VFilter); return vp8_variance4x4_c(temp2, 4, dst_ptr, dst_pixels_per_line, sse); } unsigned int vp8_sub_pixel_variance8x8_c ( const unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, const unsigned char *dst_ptr, int dst_pixels_per_line, unsigned int *sse ) { unsigned short FData3[9*8]; // Temp data bufffer used in filtering unsigned char temp2[20*16]; const short *HFilter, *VFilter; HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 9, 8, HFilter); var_filter_block2d_bil_second_pass(FData3, temp2, 8, 8, 8, 8, VFilter); return vp8_variance8x8_c(temp2, 8, dst_ptr, dst_pixels_per_line, sse); } unsigned int vp8_sub_pixel_variance16x16_c ( const unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, const unsigned char *dst_ptr, int dst_pixels_per_line, unsigned int *sse ) { unsigned short FData3[17*16]; // Temp data bufffer used in filtering unsigned char temp2[20*16]; const short *HFilter, *VFilter; HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 17, 16, HFilter); var_filter_block2d_bil_second_pass(FData3, temp2, 16, 16, 16, 16, VFilter); return vp8_variance16x16_c(temp2, 16, dst_ptr, dst_pixels_per_line, sse); } unsigned int vp8_variance_halfpixvar16x16_h_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { return vp8_sub_pixel_variance16x16_c(src_ptr, source_stride, 4, 0, ref_ptr, recon_stride, sse); } unsigned int vp8_variance_halfpixvar16x16_v_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { return vp8_sub_pixel_variance16x16_c(src_ptr, source_stride, 0, 4, ref_ptr, recon_stride, sse); } unsigned int vp8_variance_halfpixvar16x16_hv_c( const unsigned char *src_ptr, int source_stride, const unsigned char *ref_ptr, int recon_stride, unsigned int *sse) { return vp8_sub_pixel_variance16x16_c(src_ptr, source_stride, 4, 4, ref_ptr, recon_stride, sse); } unsigned int vp8_sub_pixel_mse16x16_c ( const unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, const unsigned char *dst_ptr, int dst_pixels_per_line, unsigned int *sse ) { vp8_sub_pixel_variance16x16_c(src_ptr, src_pixels_per_line, xoffset, yoffset, dst_ptr, dst_pixels_per_line, sse); return *sse; } unsigned int vp8_sub_pixel_variance16x8_c ( const unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, const unsigned char *dst_ptr, int dst_pixels_per_line, unsigned int *sse ) { unsigned short FData3[16*9]; // Temp data bufffer used in filtering unsigned char temp2[20*16]; const short *HFilter, *VFilter; HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 9, 16, HFilter); var_filter_block2d_bil_second_pass(FData3, temp2, 16, 16, 8, 16, VFilter); return vp8_variance16x8_c(temp2, 16, dst_ptr, dst_pixels_per_line, sse); } unsigned int vp8_sub_pixel_variance8x16_c ( const unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, const unsigned char *dst_ptr, int dst_pixels_per_line, unsigned int *sse ) { unsigned short FData3[9*16]; // Temp data bufffer used in filtering unsigned char temp2[20*16]; const short *HFilter, *VFilter; HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 17, 8, HFilter); var_filter_block2d_bil_second_pass(FData3, temp2, 8, 8, 16, 8, VFilter); return vp8_variance8x16_c(temp2, 8, dst_ptr, dst_pixels_per_line, sse); }