/* * 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 #include "./vp8_rtcd.h" #include "vp8/common/filter.h" DECLARE_ALIGNED(16, const short, vp8_bilinear_filters[8][2]) = { { 128, 0 }, { 112, 16 }, { 96, 32 }, { 80, 48 }, { 64, 64 }, { 48, 80 }, { 32, 96 }, { 16, 112 } }; DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[8][6]) = { { 0, 0, 128, 0, 0, 0 }, /* note that 1/8 pel positions are just as per alpha -0.5 bicubic */ { 0, -6, 123, 12, -1, 0 }, { 2, -11, 108, 36, -8, 1 }, /* New 1/4 pel 6 tap filter */ { 0, -9, 93, 50, -6, 0 }, { 3, -16, 77, 77, -16, 3 }, /* New 1/2 pel 6 tap filter */ { 0, -6, 50, 93, -9, 0 }, { 1, -8, 36, 108, -11, 2 }, /* New 1/4 pel 6 tap filter */ { 0, -1, 12, 123, -6, 0 }, }; static void filter_block2d_first_pass(unsigned char *src_ptr, int *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) { Temp = ((int)src_ptr[-2 * (int)pixel_step] * vp8_filter[0]) + ((int)src_ptr[-1 * (int)pixel_step] * vp8_filter[1]) + ((int)src_ptr[0] * vp8_filter[2]) + ((int)src_ptr[pixel_step] * vp8_filter[3]) + ((int)src_ptr[2 * pixel_step] * vp8_filter[4]) + ((int)src_ptr[3 * pixel_step] * vp8_filter[5]) + (VP8_FILTER_WEIGHT >> 1); /* Rounding */ /* Normalize back to 0-255 */ Temp = Temp >> VP8_FILTER_SHIFT; if (Temp < 0) { Temp = 0; } else if (Temp > 255) { Temp = 255; } output_ptr[j] = Temp; src_ptr++; } /* Next row... */ src_ptr += src_pixels_per_line - output_width; output_ptr += output_width; } } static void filter_block2d_second_pass(int *src_ptr, unsigned char *output_ptr, int output_pitch, 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[-2 * (int)pixel_step] * vp8_filter[0]) + ((int)src_ptr[-1 * (int)pixel_step] * vp8_filter[1]) + ((int)src_ptr[0] * vp8_filter[2]) + ((int)src_ptr[pixel_step] * vp8_filter[3]) + ((int)src_ptr[2 * pixel_step] * vp8_filter[4]) + ((int)src_ptr[3 * pixel_step] * vp8_filter[5]) + (VP8_FILTER_WEIGHT >> 1); /* Rounding */ /* Normalize back to 0-255 */ Temp = Temp >> VP8_FILTER_SHIFT; if (Temp < 0) { Temp = 0; } else if (Temp > 255) { Temp = 255; } output_ptr[j] = (unsigned char)Temp; src_ptr++; } /* Start next row */ src_ptr += src_pixels_per_line - output_width; output_ptr += output_pitch; } } static void filter_block2d(unsigned char *src_ptr, unsigned char *output_ptr, unsigned int src_pixels_per_line, int output_pitch, const short *HFilter, const short *VFilter) { int FData[9 * 4]; /* Temp data buffer used in filtering */ /* First filter 1-D horizontally... */ filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 9, 4, HFilter); /* then filter verticaly... */ filter_block2d_second_pass(FData + 8, output_ptr, output_pitch, 4, 4, 4, 4, VFilter); } void vp8_sixtap_predict4x4_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ filter_block2d(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter); } void vp8_sixtap_predict8x8_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; int FData[13 * 16]; /* Temp data buffer used in filtering */ HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ /* First filter 1-D horizontally... */ filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 13, 8, HFilter); /* then filter verticaly... */ filter_block2d_second_pass(FData + 16, dst_ptr, dst_pitch, 8, 8, 8, 8, VFilter); } void vp8_sixtap_predict8x4_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; int FData[13 * 16]; /* Temp data buffer used in filtering */ HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ /* First filter 1-D horizontally... */ filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 9, 8, HFilter); /* then filter verticaly... */ filter_block2d_second_pass(FData + 16, dst_ptr, dst_pitch, 8, 8, 4, 8, VFilter); } void vp8_sixtap_predict16x16_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; int FData[21 * 24]; /* Temp data buffer used in filtering */ HFilter = vp8_sub_pel_filters[xoffset]; /* 6 tap */ VFilter = vp8_sub_pel_filters[yoffset]; /* 6 tap */ /* First filter 1-D horizontally... */ filter_block2d_first_pass(src_ptr - (2 * src_pixels_per_line), FData, src_pixels_per_line, 1, 21, 16, HFilter); /* then filter verticaly... */ filter_block2d_second_pass(FData + 32, dst_ptr, dst_pitch, 16, 16, 16, 16, VFilter); } /**************************************************************************** * * ROUTINE : filter_block2d_bil_first_pass * * INPUTS : UINT8 *src_ptr : Pointer to source block. * UINT32 src_stride : Stride of source block. * UINT32 height : Block height. * UINT32 width : Block width. * INT32 *vp8_filter : Array of 2 bi-linear filter taps. * * OUTPUTS : INT32 *dst_ptr : Pointer to filtered block. * * RETURNS : void * * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block * in the horizontal 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. * ****************************************************************************/ static void filter_block2d_bil_first_pass( unsigned char *src_ptr, unsigned short *dst_ptr, unsigned int src_stride, unsigned int height, unsigned int width, const short *vp8_filter) { unsigned int i, j; for (i = 0; i < height; ++i) { for (j = 0; j < width; ++j) { /* Apply bilinear filter */ dst_ptr[j] = (((int)src_ptr[0] * vp8_filter[0]) + ((int)src_ptr[1] * vp8_filter[1]) + (VP8_FILTER_WEIGHT / 2)) >> VP8_FILTER_SHIFT; src_ptr++; } /* Next row... */ src_ptr += src_stride - width; dst_ptr += width; } } /**************************************************************************** * * ROUTINE : filter_block2d_bil_second_pass * * INPUTS : INT32 *src_ptr : Pointer to source block. * UINT32 dst_pitch : Destination block pitch. * UINT32 height : Block height. * UINT32 width : Block width. * INT32 *vp8_filter : Array of 2 bi-linear filter taps. * * OUTPUTS : UINT16 *dst_ptr : Pointer to filtered block. * * RETURNS : void * * FUNCTION : Applies a 1-D 2-tap bi-linear filter to the source block * in the 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. * ****************************************************************************/ static void filter_block2d_bil_second_pass(unsigned short *src_ptr, unsigned char *dst_ptr, int dst_pitch, unsigned int height, unsigned int width, const short *vp8_filter) { unsigned int i, j; int Temp; for (i = 0; i < height; ++i) { for (j = 0; j < width; ++j) { /* Apply filter */ Temp = ((int)src_ptr[0] * vp8_filter[0]) + ((int)src_ptr[width] * vp8_filter[1]) + (VP8_FILTER_WEIGHT / 2); dst_ptr[j] = (unsigned int)(Temp >> VP8_FILTER_SHIFT); src_ptr++; } /* Next row... */ dst_ptr += dst_pitch; } } /**************************************************************************** * * ROUTINE : filter_block2d_bil * * INPUTS : UINT8 *src_ptr : Pointer to source block. * UINT32 src_pitch : Stride of source block. * UINT32 dst_pitch : Stride of destination block. * INT32 *HFilter : Array of 2 horizontal filter * taps. * INT32 *VFilter : Array of 2 vertical filter taps. * INT32 Width : Block width * INT32 Height : Block height * * OUTPUTS : UINT16 *dst_ptr : Pointer to filtered block. * * RETURNS : void * * FUNCTION : 2-D filters an input block by applying a 2-tap * bi-linear filter horizontally followed by a 2-tap * bi-linear filter vertically on the result. * * SPECIAL NOTES : The largest block size can be handled here is 16x16 * ****************************************************************************/ static void filter_block2d_bil(unsigned char *src_ptr, unsigned char *dst_ptr, unsigned int src_pitch, unsigned int dst_pitch, const short *HFilter, const short *VFilter, int Width, int Height) { unsigned short FData[17 * 16]; /* Temp data buffer used in filtering */ /* First filter 1-D horizontally... */ filter_block2d_bil_first_pass(src_ptr, FData, src_pitch, Height + 1, Width, HFilter); /* then 1-D vertically... */ filter_block2d_bil_second_pass(FData, dst_ptr, dst_pitch, Height, Width, VFilter); } void vp8_bilinear_predict4x4_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; // This represents a copy and is not required to be handled by optimizations. assert((xoffset | yoffset) != 0); HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 4, 4); } void vp8_bilinear_predict8x8_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; assert((xoffset | yoffset) != 0); HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 8, 8); } void vp8_bilinear_predict8x4_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; assert((xoffset | yoffset) != 0); HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 8, 4); } void vp8_bilinear_predict16x16_c(unsigned char *src_ptr, int src_pixels_per_line, int xoffset, int yoffset, unsigned char *dst_ptr, int dst_pitch) { const short *HFilter; const short *VFilter; assert((xoffset | yoffset) != 0); HFilter = vp8_bilinear_filters[xoffset]; VFilter = vp8_bilinear_filters[yoffset]; filter_block2d_bil(src_ptr, dst_ptr, src_pixels_per_line, dst_pitch, HFilter, VFilter, 16, 16); }