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Diffstat (limited to 'media/libvpx/vp8/common/filter.c')
-rw-r--r-- | media/libvpx/vp8/common/filter.c | 493 |
1 files changed, 493 insertions, 0 deletions
diff --git a/media/libvpx/vp8/common/filter.c b/media/libvpx/vp8/common/filter.c new file mode 100644 index 000000000..84c608eff --- /dev/null +++ b/media/libvpx/vp8/common/filter.c @@ -0,0 +1,493 @@ +/* + * 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 "filter.h" +#include "./vp8_rtcd.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; + + HFilter = vp8_bilinear_filters[xoffset]; + VFilter = vp8_bilinear_filters[yoffset]; +#if 0 + { + int i; + unsigned char temp1[16]; + unsigned char temp2[16]; + + bilinear_predict4x4_mmx(src_ptr, src_pixels_per_line, xoffset, yoffset, temp1, 4); + filter_block2d_bil(src_ptr, temp2, src_pixels_per_line, 4, HFilter, VFilter, 4, 4); + + for (i = 0; i < 16; i++) + { + if (temp1[i] != temp2[i]) + { + bilinear_predict4x4_mmx(src_ptr, src_pixels_per_line, xoffset, yoffset, temp1, 4); + filter_block2d_bil(src_ptr, temp2, src_pixels_per_line, 4, HFilter, VFilter, 4, 4); + } + } + } +#endif + 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; + + 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; + + 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; + + 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); +} |