338 lines
10 KiB
C
338 lines
10 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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#include "./vp8_rtcd.h"
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#include "filter.h"
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#include "variance.h"
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/* This is a bad idea.
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* ctz = count trailing zeros */
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static int ctz(int a) {
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int b = 0;
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while (a != 1) {
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a >>= 1;
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b++;
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}
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return b;
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}
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static unsigned int variance(
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const unsigned char *src_ptr,
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int source_stride,
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const unsigned char *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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{
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int i, j;
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int diff, sum;
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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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{
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for (j = 0; j < w; j++)
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{
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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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return (*sse - (((unsigned int)sum * sum) >> (int)((ctz(w) + ctz(h)))));
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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 *src_ptr : Pointer to source block.
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* UINT32 src_pixels_per_line : Stride of input block.
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* UINT32 pixel_step : Offset between filter input samples (see notes).
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* UINT32 output_height : Input block height.
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* UINT32 output_width : Input block width.
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* INT32 *vp8_filter : Array of 2 bi-linear filter taps.
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*
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* OUTPUTS : INT32 *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 output to retain precision for next pass.
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* Two filter taps should sum to VP8_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
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(
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const unsigned char *src_ptr,
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unsigned short *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 short *vp8_filter
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)
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{
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unsigned int i, j;
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for (i = 0; i < output_height; i++)
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{
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for (j = 0; j < output_width; j++)
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{
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/* Apply bilinear filter */
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output_ptr[j] = (((int)src_ptr[0] * vp8_filter[0]) +
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((int)src_ptr[pixel_step] * vp8_filter[1]) +
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(VP8_FILTER_WEIGHT / 2)) >> VP8_FILTER_SHIFT;
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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 *src_ptr : Pointer to source block.
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* UINT32 src_pixels_per_line : Stride of input block.
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* UINT32 pixel_step : Offset between filter input samples (see notes).
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* UINT32 output_height : Input block height.
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* UINT32 output_width : Input block width.
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* INT32 *vp8_filter : Array of 2 bi-linear filter taps.
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*
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* OUTPUTS : UINT16 *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 VP8_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
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(
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const unsigned short *src_ptr,
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unsigned char *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 short *vp8_filter
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)
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{
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unsigned int i, j;
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int Temp;
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for (i = 0; i < output_height; i++)
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{
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for (j = 0; j < output_width; j++)
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{
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/* Apply filter */
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Temp = ((int)src_ptr[0] * vp8_filter[0]) +
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((int)src_ptr[pixel_step] * vp8_filter[1]) +
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(VP8_FILTER_WEIGHT / 2);
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output_ptr[j] = (unsigned int)(Temp >> VP8_FILTER_SHIFT);
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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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unsigned int vp8_sub_pixel_variance4x4_c
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(
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const unsigned char *src_ptr,
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int src_pixels_per_line,
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int xoffset,
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int yoffset,
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const unsigned char *dst_ptr,
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int dst_pixels_per_line,
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unsigned int *sse
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)
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{
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unsigned char temp2[20*16];
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const short *HFilter, *VFilter;
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unsigned short FData3[5*4]; /* Temp data bufffer used in filtering */
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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/* First filter 1d Horizontal */
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var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 5, 4, HFilter);
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/* Now filter Verticaly */
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var_filter_block2d_bil_second_pass(FData3, temp2, 4, 4, 4, 4, VFilter);
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return variance(temp2, 4, dst_ptr, dst_pixels_per_line, 4, 4, sse);
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}
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unsigned int vp8_sub_pixel_variance8x8_c
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(
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const unsigned char *src_ptr,
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int src_pixels_per_line,
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int xoffset,
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int yoffset,
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const unsigned char *dst_ptr,
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int dst_pixels_per_line,
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unsigned int *sse
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)
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{
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unsigned short FData3[9*8]; /* Temp data bufffer used in filtering */
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unsigned char temp2[20*16];
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const short *HFilter, *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 9, 8, HFilter);
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var_filter_block2d_bil_second_pass(FData3, temp2, 8, 8, 8, 8, VFilter);
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return variance(temp2, 8, dst_ptr, dst_pixels_per_line, 8, 8, sse);
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}
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unsigned int vp8_sub_pixel_variance16x16_c
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(
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const unsigned char *src_ptr,
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int src_pixels_per_line,
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int xoffset,
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int yoffset,
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const unsigned char *dst_ptr,
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int dst_pixels_per_line,
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unsigned int *sse
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)
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{
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unsigned short FData3[17*16]; /* Temp data bufffer used in filtering */
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unsigned char temp2[20*16];
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const short *HFilter, *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 17, 16, HFilter);
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var_filter_block2d_bil_second_pass(FData3, temp2, 16, 16, 16, 16, VFilter);
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return variance(temp2, 16, dst_ptr, dst_pixels_per_line, 16, 16, sse);
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}
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unsigned int vp8_variance_halfpixvar16x16_h_c(
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const unsigned char *src_ptr,
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int source_stride,
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const unsigned char *ref_ptr,
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int recon_stride,
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unsigned int *sse)
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{
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return vp8_sub_pixel_variance16x16_c(src_ptr, source_stride, 4, 0,
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ref_ptr, recon_stride, sse);
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}
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unsigned int vp8_variance_halfpixvar16x16_v_c(
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const unsigned char *src_ptr,
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int source_stride,
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const unsigned char *ref_ptr,
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int recon_stride,
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unsigned int *sse)
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{
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return vp8_sub_pixel_variance16x16_c(src_ptr, source_stride, 0, 4,
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ref_ptr, recon_stride, sse);
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}
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unsigned int vp8_variance_halfpixvar16x16_hv_c(
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const unsigned char *src_ptr,
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int source_stride,
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const unsigned char *ref_ptr,
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int recon_stride,
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unsigned int *sse)
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{
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return vp8_sub_pixel_variance16x16_c(src_ptr, source_stride, 4, 4,
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ref_ptr, recon_stride, sse);
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}
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unsigned int vp8_sub_pixel_variance16x8_c
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(
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const unsigned char *src_ptr,
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int src_pixels_per_line,
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int xoffset,
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int yoffset,
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const unsigned char *dst_ptr,
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int dst_pixels_per_line,
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unsigned int *sse
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)
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{
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unsigned short FData3[16*9]; /* Temp data bufffer used in filtering */
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unsigned char temp2[20*16];
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const short *HFilter, *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 9, 16, HFilter);
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var_filter_block2d_bil_second_pass(FData3, temp2, 16, 16, 8, 16, VFilter);
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return variance(temp2, 16, dst_ptr, dst_pixels_per_line, 16, 8, sse);
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}
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unsigned int vp8_sub_pixel_variance8x16_c
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(
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const unsigned char *src_ptr,
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int src_pixels_per_line,
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int xoffset,
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int yoffset,
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const unsigned char *dst_ptr,
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int dst_pixels_per_line,
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unsigned int *sse
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)
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{
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unsigned short FData3[9*16]; /* Temp data bufffer used in filtering */
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unsigned char temp2[20*16];
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const short *HFilter, *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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var_filter_block2d_bil_first_pass(src_ptr, FData3, src_pixels_per_line, 1, 17, 8, HFilter);
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var_filter_block2d_bil_second_pass(FData3, temp2, 8, 8, 16, 8, VFilter);
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return variance(temp2, 8, dst_ptr, dst_pixels_per_line, 8, 16, sse);
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}
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