494 lines
14 KiB
C
494 lines
14 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 "filter.h"
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#include "./vp8_rtcd.h"
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DECLARE_ALIGNED(16, const short, vp8_bilinear_filters[8][2]) =
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{
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{ 128, 0 },
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{ 112, 16 },
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{ 96, 32 },
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{ 80, 48 },
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{ 64, 64 },
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{ 48, 80 },
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{ 32, 96 },
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{ 16, 112 }
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};
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DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[8][6]) =
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{
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{ 0, 0, 128, 0, 0, 0 }, /* note that 1/8 pel positions are just as per alpha -0.5 bicubic */
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{ 0, -6, 123, 12, -1, 0 },
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{ 2, -11, 108, 36, -8, 1 }, /* New 1/4 pel 6 tap filter */
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{ 0, -9, 93, 50, -6, 0 },
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{ 3, -16, 77, 77, -16, 3 }, /* New 1/2 pel 6 tap filter */
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{ 0, -6, 50, 93, -9, 0 },
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{ 1, -8, 36, 108, -11, 2 }, /* New 1/4 pel 6 tap filter */
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{ 0, -1, 12, 123, -6, 0 },
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};
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static void filter_block2d_first_pass
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(
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unsigned char *src_ptr,
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int *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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Temp = ((int)src_ptr[-2 * (int)pixel_step] * vp8_filter[0]) +
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((int)src_ptr[-1 * (int)pixel_step] * vp8_filter[1]) +
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((int)src_ptr[0] * vp8_filter[2]) +
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((int)src_ptr[pixel_step] * vp8_filter[3]) +
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((int)src_ptr[2*pixel_step] * vp8_filter[4]) +
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((int)src_ptr[3*pixel_step] * vp8_filter[5]) +
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(VP8_FILTER_WEIGHT >> 1); /* Rounding */
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/* Normalize back to 0-255 */
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Temp = Temp >> VP8_FILTER_SHIFT;
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if (Temp < 0)
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Temp = 0;
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else if (Temp > 255)
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Temp = 255;
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output_ptr[j] = Temp;
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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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static void filter_block2d_second_pass
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(
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int *src_ptr,
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unsigned char *output_ptr,
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int output_pitch,
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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[-2 * (int)pixel_step] * vp8_filter[0]) +
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((int)src_ptr[-1 * (int)pixel_step] * vp8_filter[1]) +
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((int)src_ptr[0] * vp8_filter[2]) +
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((int)src_ptr[pixel_step] * vp8_filter[3]) +
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((int)src_ptr[2*pixel_step] * vp8_filter[4]) +
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((int)src_ptr[3*pixel_step] * vp8_filter[5]) +
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(VP8_FILTER_WEIGHT >> 1); /* Rounding */
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/* Normalize back to 0-255 */
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Temp = Temp >> VP8_FILTER_SHIFT;
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if (Temp < 0)
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Temp = 0;
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else if (Temp > 255)
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Temp = 255;
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output_ptr[j] = (unsigned char)Temp;
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src_ptr++;
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}
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/* Start next row */
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src_ptr += src_pixels_per_line - output_width;
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output_ptr += output_pitch;
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}
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}
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static void filter_block2d
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(
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unsigned char *src_ptr,
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unsigned char *output_ptr,
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unsigned int src_pixels_per_line,
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int output_pitch,
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const short *HFilter,
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const short *VFilter
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)
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{
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int FData[9*4]; /* Temp data buffer used in filtering */
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/* First filter 1-D horizontally... */
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filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 9, 4, HFilter);
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/* then filter verticaly... */
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filter_block2d_second_pass(FData + 8, output_ptr, output_pitch, 4, 4, 4, 4, VFilter);
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}
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void vp8_sixtap_predict4x4_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */
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VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */
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filter_block2d(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter);
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}
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void vp8_sixtap_predict8x8_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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int FData[13*16]; /* Temp data buffer used in filtering */
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HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */
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VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */
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/* First filter 1-D horizontally... */
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filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 13, 8, HFilter);
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/* then filter verticaly... */
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filter_block2d_second_pass(FData + 16, dst_ptr, dst_pitch, 8, 8, 8, 8, VFilter);
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}
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void vp8_sixtap_predict8x4_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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int FData[13*16]; /* Temp data buffer used in filtering */
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HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */
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VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */
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/* First filter 1-D horizontally... */
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filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 9, 8, HFilter);
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/* then filter verticaly... */
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filter_block2d_second_pass(FData + 16, dst_ptr, dst_pitch, 8, 8, 4, 8, VFilter);
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}
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void vp8_sixtap_predict16x16_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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int FData[21*24]; /* Temp data buffer used in filtering */
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HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */
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VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */
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/* First filter 1-D horizontally... */
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filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 21, 16, HFilter);
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/* then filter verticaly... */
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filter_block2d_second_pass(FData + 32, dst_ptr, dst_pitch, 16, 16, 16, 16, VFilter);
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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_stride : Stride of source block.
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* UINT32 height : Block height.
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* UINT32 width : 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 *dst_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
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* in the horizontal direction to produce the filtered output
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* block. Used to implement first-pass 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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*
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****************************************************************************/
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static void filter_block2d_bil_first_pass
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(
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unsigned char *src_ptr,
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unsigned short *dst_ptr,
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unsigned int src_stride,
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unsigned int height,
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unsigned int 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 < height; i++)
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{
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for (j = 0; j < width; j++)
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{
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/* Apply bilinear filter */
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dst_ptr[j] = (((int)src_ptr[0] * vp8_filter[0]) +
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((int)src_ptr[1] * 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_stride - width;
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dst_ptr += 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 dst_pitch : Destination block pitch.
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* UINT32 height : Block height.
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* UINT32 width : 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 *dst_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
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* in the vertical direction to produce the filtered output
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* block. Used to implement second-pass 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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*
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****************************************************************************/
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static void filter_block2d_bil_second_pass
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(
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unsigned short *src_ptr,
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unsigned char *dst_ptr,
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int dst_pitch,
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unsigned int height,
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unsigned int 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 < height; i++)
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{
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for (j = 0; j < 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[width] * vp8_filter[1]) +
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(VP8_FILTER_WEIGHT / 2);
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dst_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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dst_ptr += dst_pitch;
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}
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}
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/****************************************************************************
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*
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* ROUTINE : filter_block2d_bil
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*
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* INPUTS : UINT8 *src_ptr : Pointer to source block.
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* UINT32 src_pitch : Stride of source block.
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* UINT32 dst_pitch : Stride of destination block.
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* INT32 *HFilter : Array of 2 horizontal filter taps.
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* INT32 *VFilter : Array of 2 vertical filter taps.
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* INT32 Width : Block width
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* INT32 Height : Block height
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*
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* OUTPUTS : UINT16 *dst_ptr : Pointer to filtered block.
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*
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* RETURNS : void
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*
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* FUNCTION : 2-D filters an input block by applying a 2-tap
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* bi-linear filter horizontally followed by a 2-tap
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* bi-linear filter vertically on the result.
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*
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* SPECIAL NOTES : The largest block size can be handled here is 16x16
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*
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****************************************************************************/
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static void filter_block2d_bil
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(
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unsigned char *src_ptr,
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unsigned char *dst_ptr,
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unsigned int src_pitch,
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unsigned int dst_pitch,
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const short *HFilter,
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const short *VFilter,
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int Width,
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int Height
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)
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{
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unsigned short FData[17*16]; /* Temp data buffer used in filtering */
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/* First filter 1-D horizontally... */
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filter_block2d_bil_first_pass(src_ptr, FData, src_pitch, Height + 1, Width, HFilter);
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/* then 1-D vertically... */
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filter_block2d_bil_second_pass(FData, dst_ptr, dst_pitch, Height, Width, VFilter);
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}
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void vp8_bilinear_predict4x4_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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#if 0
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{
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int i;
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unsigned char temp1[16];
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unsigned char temp2[16];
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bilinear_predict4x4_mmx(src_ptr, src_pixels_per_line, xoffset, yoffset, temp1, 4);
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filter_block2d_bil(src_ptr, temp2, src_pixels_per_line, 4, HFilter, VFilter, 4, 4);
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for (i = 0; i < 16; i++)
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{
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if (temp1[i] != temp2[i])
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{
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bilinear_predict4x4_mmx(src_ptr, src_pixels_per_line, xoffset, yoffset, temp1, 4);
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filter_block2d_bil(src_ptr, temp2, src_pixels_per_line, 4, HFilter, VFilter, 4, 4);
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}
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}
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}
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#endif
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filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 4, 4);
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}
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void vp8_bilinear_predict8x8_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 8, 8);
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}
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void vp8_bilinear_predict8x4_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 8, 4);
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}
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void vp8_bilinear_predict16x16_c
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(
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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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unsigned char *dst_ptr,
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int dst_pitch
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)
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{
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const short *HFilter;
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const short *VFilter;
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HFilter = vp8_bilinear_filters[xoffset];
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VFilter = vp8_bilinear_filters[yoffset];
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filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 16, 16);
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}
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