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-rw-r--r--libvpx/vp8/common/filter.c494
1 files changed, 494 insertions, 0 deletions
diff --git a/libvpx/vp8/common/filter.c b/libvpx/vp8/common/filter.c
new file mode 100644
index 0000000..1901ea3
--- /dev/null
+++ b/libvpx/vp8/common/filter.c
@@ -0,0 +1,494 @@
+/*
+ * 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 <stdlib.h>
+#include "filter.h"
+#include "vpx_ports/mem.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);
+}
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