2612b99cc7
Removing VP9_FILTER_WEIGHT, VP9_FILTER_SHIFT, BLOCK_WIDTH_HEIGHT constants. Using ROUND_POWER_OF_TWO for rounding. Change-Id: I2e8d6858dcd600a87096138209731137d7decc24
146 lines
5.8 KiB
C
146 lines
5.8 KiB
C
/*
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* Copyright (c) 2010 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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#ifndef VP9_COMMON_VP9_SUBPELVAR_H_
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#define VP9_COMMON_VP9_SUBPELVAR_H_
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#include "vp9/common/vp9_common.h"
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#include "vp9/common/vp9_convolve.h"
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static void variance(const uint8_t *src_ptr,
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int source_stride,
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const uint8_t *ref_ptr,
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int recon_stride,
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int w,
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int h,
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unsigned int *sse,
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int *sum) {
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int i, j;
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int diff;
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*sum = 0;
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*sse = 0;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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diff = src_ptr[j] - ref_ptr[j];
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*sum += diff;
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*sse += diff * diff;
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}
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src_ptr += source_stride;
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ref_ptr += recon_stride;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : filter_block2d_bil_first_pass
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*
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* INPUTS : uint8_t *src_ptr : Pointer to source block.
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* uint32_t src_pixels_per_line : Stride of input block.
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* uint32_t pixel_step : Offset between filter input samples (see notes).
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* uint32_t output_height : Input block height.
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* uint32_t output_width : Input block width.
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* int32_t *vp9_filter : Array of 2 bi-linear filter taps.
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*
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* OUTPUTS : int32_t *output_ptr : Pointer to filtered block.
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*
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* RETURNS : void
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*
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* FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block in
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* either horizontal or vertical direction to produce the
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* filtered output block. Used to implement first-pass
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* of 2-D separable filter.
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*
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* SPECIAL NOTES : Produces int32_t output to retain precision for next pass.
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* Two filter taps should sum to VP9_FILTER_WEIGHT.
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* pixel_step defines whether the filter is applied
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* horizontally (pixel_step=1) or vertically (pixel_step=stride).
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* It defines the offset required to move from one input
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* to the next.
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*
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****************************************************************************/
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static void var_filter_block2d_bil_first_pass(const uint8_t *src_ptr,
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uint16_t *output_ptr,
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unsigned int src_pixels_per_line,
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int pixel_step,
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unsigned int output_height,
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unsigned int output_width,
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const int16_t *vp9_filter) {
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unsigned int i, j;
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for (i = 0; i < output_height; i++) {
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for (j = 0; j < output_width; j++) {
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output_ptr[j] = ROUND_POWER_OF_TWO((int)src_ptr[0] * vp9_filter[0] +
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(int)src_ptr[pixel_step] * vp9_filter[1],
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VP9_FILTER_BITS);
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src_ptr++;
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}
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// Next row...
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src_ptr += src_pixels_per_line - output_width;
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output_ptr += output_width;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : filter_block2d_bil_second_pass
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*
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* INPUTS : int32_t *src_ptr : Pointer to source block.
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* uint32_t src_pixels_per_line : Stride of input block.
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* uint32_t pixel_step : Offset between filter input samples (see notes).
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* uint32_t output_height : Input block height.
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* uint32_t output_width : Input block width.
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* int32_t *vp9_filter : Array of 2 bi-linear filter taps.
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*
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* OUTPUTS : uint16_t *output_ptr : Pointer to filtered block.
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*
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* RETURNS : void
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*
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* FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block in
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* either horizontal or vertical direction to produce the
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* filtered output block. Used to implement second-pass
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* of 2-D separable filter.
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*
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* SPECIAL NOTES : Requires 32-bit input as produced by filter_block2d_bil_first_pass.
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* Two filter taps should sum to VP9_FILTER_WEIGHT.
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* pixel_step defines whether the filter is applied
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* horizontally (pixel_step=1) or vertically (pixel_step=stride).
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* It defines the offset required to move from one input
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* to the next.
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*
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****************************************************************************/
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static void var_filter_block2d_bil_second_pass(const uint16_t *src_ptr,
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uint8_t *output_ptr,
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unsigned int src_pixels_per_line,
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unsigned int pixel_step,
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unsigned int output_height,
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unsigned int output_width,
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const int16_t *vp9_filter) {
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unsigned int i, j;
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for (i = 0; i < output_height; i++) {
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for (j = 0; j < output_width; j++) {
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output_ptr[j] = ROUND_POWER_OF_TWO((int)src_ptr[0] * vp9_filter[0] +
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(int)src_ptr[pixel_step] * vp9_filter[1],
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VP9_FILTER_BITS);
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src_ptr++;
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}
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src_ptr += src_pixels_per_line - output_width;
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output_ptr += output_width;
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}
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}
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#endif // VP9_COMMON_VP9_SUBPELVAR_H_
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