148 lines
5.8 KiB
C
148 lines
5.8 KiB
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 "vp9/common/filter.h"
|
|
|
|
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* 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 *vp9_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 VP9_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 *vp9_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] * vp9_filter[0]) +
|
|
((int)src_ptr[pixel_step] * vp9_filter[1]) +
|
|
(VP9_FILTER_WEIGHT / 2)) >> VP9_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 *vp9_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 VP9_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 *vp9_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] * vp9_filter[0]) +
|
|
((int)src_ptr[pixel_step] * vp9_filter[1]) +
|
|
(VP9_FILTER_WEIGHT / 2);
|
|
output_ptr[j] = (unsigned int)(Temp >> VP9_FILTER_SHIFT);
|
|
src_ptr++;
|
|
}
|
|
|
|
// Next row...
|
|
src_ptr += src_pixels_per_line - output_width;
|
|
output_ptr += output_width;
|
|
}
|
|
}
|
|
|