aom_dsp/aom_convolve.c - aom - Git at Google

 /*
  * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
  *
  * This source code is subject to the terms of the BSD 2 Clause License and
  * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
  * was not distributed with this source code in the LICENSE file, you can
  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
  * Media Patent License 1.0 was not distributed with this source code in the
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */

 #include <assert.h>
 #include <string.h>

 #include "config/aom_config.h"
 #include "config/aom_dsp_rtcd.h"

 #include "aom/aom_integer.h"
 #include "aom_dsp/aom_dsp_common.h"
 #include "aom_dsp/aom_filter.h"
 #include "aom_ports/mem.h"

 static inline int horz_scalar_product(const uint8_t *a, const int16_t *b) {
   int sum = 0;
   for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k] * b[k];
   return sum;
 }

 static inline int vert_scalar_product(const uint8_t *a, ptrdiff_t a_stride,
                                       const int16_t *b) {
   int sum = 0;
   for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k * a_stride] * b[k];
   return sum;
 }

 static void convolve_horiz(const uint8_t *src, ptrdiff_t src_stride,
                            uint8_t *dst, ptrdiff_t dst_stride,
                            const InterpKernel *x_filters, int x0_q4,
                            int x_step_q4, int w, int h) {
   src -= SUBPEL_TAPS / 2 - 1;
   for (int y = 0; y < h; ++y) {
     int x_q4 = x0_q4;
     for (int x = 0; x < w; ++x) {
       const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
       const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
       const int sum = horz_scalar_product(src_x, x_filter);
       dst[x] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
       x_q4 += x_step_q4;
     }
     src += src_stride;
     dst += dst_stride;
   }
 }

 static void convolve_vert(const uint8_t *src, ptrdiff_t src_stride,
                           uint8_t *dst, ptrdiff_t dst_stride,
                           const InterpKernel *y_filters, int y0_q4,
                           int y_step_q4, int w, int h) {
   src -= src_stride * (SUBPEL_TAPS / 2 - 1);

   for (int x = 0; x < w; ++x) {
     int y_q4 = y0_q4;
     for (int y = 0; y < h; ++y) {
       const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
       const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
       const int sum = vert_scalar_product(src_y, src_stride, y_filter);
       dst[y * dst_stride] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
       y_q4 += y_step_q4;
     }
     ++src;
     ++dst;
   }
 }

 static const InterpKernel *get_filter_base(const int16_t *filter) {
   // NOTE: This assumes that the filter table is 256-byte aligned.
   return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF));
 }

 static int get_filter_offset(const int16_t *f, const InterpKernel *base) {
   return (int)((const InterpKernel *)(intptr_t)f - base);
 }

 void aom_convolve8_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
                            uint8_t *dst, ptrdiff_t dst_stride,
                            const int16_t *filter_x, int x_step_q4,
                            const int16_t *filter_y, int y_step_q4, int w,
                            int h) {
   const InterpKernel *const filters_x = get_filter_base(filter_x);
   const int x0_q4 = get_filter_offset(filter_x, filters_x);

   (void)filter_y;
   (void)y_step_q4;

   convolve_horiz(src, src_stride, dst, dst_stride, filters_x, x0_q4, x_step_q4,
                  w, h);
 }

 void aom_convolve8_vert_c(const uint8_t *src, ptrdiff_t src_stride,
                           uint8_t *dst, ptrdiff_t dst_stride,
                           const int16_t *filter_x, int x_step_q4,
                           const int16_t *filter_y, int y_step_q4, int w,
                           int h) {
   const InterpKernel *const filters_y = get_filter_base(filter_y);
   const int y0_q4 = get_filter_offset(filter_y, filters_y);

   (void)filter_x;
   (void)x_step_q4;

   convolve_vert(src, src_stride, dst, dst_stride, filters_y, y0_q4, y_step_q4,
                 w, h);
 }

 void aom_scaled_2d_c(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst,
                      ptrdiff_t dst_stride, const InterpKernel *filter,
                      int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w,
                      int h) {
   // Note: Fixed size intermediate buffer, temp, places limits on parameters.
   // 2d filtering proceeds in 2 steps:
   //   (1) Interpolate horizontally into an intermediate buffer, temp.
   //   (2) Interpolate temp vertically to derive the sub-pixel result.
   // Deriving the maximum number of rows in the temp buffer (135):
   // --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative).
   // --Largest block size is 64x64 pixels.
   // --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the
   //   original frame (in 1/16th pixel units).
   // --Must round-up because block may be located at sub-pixel position.
   // --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails.
   // --((64 - 1) * 32 + 15) >> 4 + 8 = 135.
   // When calling in frame scaling function, the smallest scaling factor is x1/4
   // ==> y_step_q4 = 64. Since w and h are at most 16, the temp buffer is still
   // big enough.
   uint8_t temp[64 * 135];
   const int intermediate_height =
       (((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;

   assert(w <= 64);
   assert(h <= 64);
   assert(y_step_q4 <= 32 || (y_step_q4 <= 64 && h <= 32));
   assert(x_step_q4 <= 64);

   convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1), src_stride, temp, 64,
                  filter, x0_q4, x_step_q4, w, intermediate_height);
   convolve_vert(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, dst_stride, filter,
                 y0_q4, y_step_q4, w, h);
 }

 void aom_convolve_copy_c(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst,
                          ptrdiff_t dst_stride, int w, int h) {
   for (int r = h; r > 0; --r) {
     memmove(dst, src, w);
     src += src_stride;
     dst += dst_stride;
   }
 }

 #if CONFIG_AV1_HIGHBITDEPTH
 static inline int highbd_vert_scalar_product(const uint16_t *a,
                                              ptrdiff_t a_stride,
                                              const int16_t *b) {
   int sum = 0;
   for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k * a_stride] * b[k];
   return sum;
 }

 static inline int highbd_horz_scalar_product(const uint16_t *a,
                                              const int16_t *b) {
   int sum = 0;
   for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k] * b[k];
   return sum;
 }

 static void highbd_convolve_horiz(const uint8_t *src8, ptrdiff_t src_stride,
                                   uint8_t *dst8, ptrdiff_t dst_stride,
                                   const InterpKernel *x_filters, int x0_q4,
                                   int x_step_q4, int w, int h, int bd) {
   uint16_t *src = CONVERT_TO_SHORTPTR(src8);
   uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
   src -= SUBPEL_TAPS / 2 - 1;
   for (int y = 0; y < h; ++y) {
     int x_q4 = x0_q4;
     for (int x = 0; x < w; ++x) {
       const uint16_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
       const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
       const int sum = highbd_horz_scalar_product(src_x, x_filter);
       dst[x] = clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd);
       x_q4 += x_step_q4;
     }
     src += src_stride;
     dst += dst_stride;
   }
 }

 static void highbd_convolve_vert(const uint8_t *src8, ptrdiff_t src_stride,
                                  uint8_t *dst8, ptrdiff_t dst_stride,
                                  const InterpKernel *y_filters, int y0_q4,
                                  int y_step_q4, int w, int h, int bd) {
   uint16_t *src = CONVERT_TO_SHORTPTR(src8);
   uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
   src -= src_stride * (SUBPEL_TAPS / 2 - 1);
   for (int x = 0; x < w; ++x) {
     int y_q4 = y0_q4;
     for (int y = 0; y < h; ++y) {
       const uint16_t *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
       const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
       const int sum = highbd_vert_scalar_product(src_y, src_stride, y_filter);
       dst[y * dst_stride] =
           clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd);
       y_q4 += y_step_q4;
     }
     ++src;
     ++dst;
   }
 }

 void aom_highbd_convolve8_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
                                   uint8_t *dst, ptrdiff_t dst_stride,
                                   const int16_t *filter_x, int x_step_q4,
                                   const int16_t *filter_y, int y_step_q4, int w,
                                   int h, int bd) {
   const InterpKernel *const filters_x = get_filter_base(filter_x);
   const int x0_q4 = get_filter_offset(filter_x, filters_x);
   (void)filter_y;
   (void)y_step_q4;

   highbd_convolve_horiz(src, src_stride, dst, dst_stride, filters_x, x0_q4,
                         x_step_q4, w, h, bd);
 }

 void aom_highbd_convolve8_vert_c(const uint8_t *src, ptrdiff_t src_stride,
                                  uint8_t *dst, ptrdiff_t dst_stride,
                                  const int16_t *filter_x, int x_step_q4,
                                  const int16_t *filter_y, int y_step_q4, int w,
                                  int h, int bd) {
   const InterpKernel *const filters_y = get_filter_base(filter_y);
   const int y0_q4 = get_filter_offset(filter_y, filters_y);
   (void)filter_x;
   (void)x_step_q4;

   highbd_convolve_vert(src, src_stride, dst, dst_stride, filters_y, y0_q4,
                        y_step_q4, w, h, bd);
 }

 void aom_highbd_convolve_copy_c(const uint16_t *src, ptrdiff_t src_stride,
                                 uint16_t *dst, ptrdiff_t dst_stride, int w,
                                 int h) {
   for (int y = 0; y < h; ++y) {
     memmove(dst, src, w * sizeof(src[0]));
     src += src_stride;
     dst += dst_stride;
   }
 }
 #endif  // CONFIG_AV1_HIGHBITDEPTH
	/*
	* Copyright (c) 2016, Alliance for Open Media. All rights reserved.
	*
	* This source code is subject to the terms of the BSD 2 Clause License and
	* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
	* was not distributed with this source code in the LICENSE file, you can
	* obtain it at www.aomedia.org/license/software. If the Alliance for Open
	* Media Patent License 1.0 was not distributed with this source code in the
	* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
	*/

	#include <assert.h>
	#include <string.h>

	#include "config/aom_config.h"
	#include "config/aom_dsp_rtcd.h"

	#include "aom/aom_integer.h"
	#include "aom_dsp/aom_dsp_common.h"
	#include "aom_dsp/aom_filter.h"
	#include "aom_ports/mem.h"

	static inline int horz_scalar_product(const uint8_t a, const int16_t b) {
	int sum = 0;
	for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k] * b[k];
	return sum;
	}

	static inline int vert_scalar_product(const uint8_t *a, ptrdiff_t a_stride,
	const int16_t *b) {
	int sum = 0;
	for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k * a_stride] * b[k];
	return sum;
	}

	static void convolve_horiz(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const InterpKernel *x_filters, int x0_q4,
	int x_step_q4, int w, int h) {
	src -= SUBPEL_TAPS / 2 - 1;
	for (int y = 0; y < h; ++y) {
	int x_q4 = x0_q4;
	for (int x = 0; x < w; ++x) {
	const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
	const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
	const int sum = horz_scalar_product(src_x, x_filter);
	dst[x] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
	x_q4 += x_step_q4;
	}
	src += src_stride;
	dst += dst_stride;
	}
	}

	static void convolve_vert(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const InterpKernel *y_filters, int y0_q4,
	int y_step_q4, int w, int h) {
	src -= src_stride * (SUBPEL_TAPS / 2 - 1);

	for (int x = 0; x < w; ++x) {
	int y_q4 = y0_q4;
	for (int y = 0; y < h; ++y) {
	const unsigned char src_y = &src[(y_q4 >> SUBPEL_BITS) src_stride];
	const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
	const int sum = vert_scalar_product(src_y, src_stride, y_filter);
	dst[y * dst_stride] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
	y_q4 += y_step_q4;
	}
	++src;
	++dst;
	}
	}

	static const InterpKernel get_filter_base(const int16_t filter) {
	// NOTE: This assumes that the filter table is 256-byte aligned.
	return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF));
	}

	static int get_filter_offset(const int16_t f, const InterpKernel base) {
	return (int)((const InterpKernel *)(intptr_t)f - base);
	}

	void aom_convolve8_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const int16_t *filter_x, int x_step_q4,
	const int16_t *filter_y, int y_step_q4, int w,
	int h) {
	const InterpKernel *const filters_x = get_filter_base(filter_x);
	const int x0_q4 = get_filter_offset(filter_x, filters_x);

	(void)filter_y;
	(void)y_step_q4;

	convolve_horiz(src, src_stride, dst, dst_stride, filters_x, x0_q4, x_step_q4,
	w, h);
	}

	void aom_convolve8_vert_c(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const int16_t *filter_x, int x_step_q4,
	const int16_t *filter_y, int y_step_q4, int w,
	int h) {
	const InterpKernel *const filters_y = get_filter_base(filter_y);
	const int y0_q4 = get_filter_offset(filter_y, filters_y);

	(void)filter_x;
	(void)x_step_q4;

	convolve_vert(src, src_stride, dst, dst_stride, filters_y, y0_q4, y_step_q4,
	w, h);
	}

	void aom_scaled_2d_c(const uint8_t src, ptrdiff_t src_stride, uint8_t dst,
	ptrdiff_t dst_stride, const InterpKernel *filter,
	int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w,
	int h) {
	// Note: Fixed size intermediate buffer, temp, places limits on parameters.
	// 2d filtering proceeds in 2 steps:
	// (1) Interpolate horizontally into an intermediate buffer, temp.
	// (2) Interpolate temp vertically to derive the sub-pixel result.
	// Deriving the maximum number of rows in the temp buffer (135):
	// --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative).
	// --Largest block size is 64x64 pixels.
	// --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the
	// original frame (in 1/16th pixel units).
	// --Must round-up because block may be located at sub-pixel position.
	// --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails.
	// --((64 - 1) * 32 + 15) >> 4 + 8 = 135.
	// When calling in frame scaling function, the smallest scaling factor is x1/4
	// ==> y_step_q4 = 64. Since w and h are at most 16, the temp buffer is still
	// big enough.
	uint8_t temp[64 * 135];
	const int intermediate_height =
	(((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;

	assert(w <= 64);
	assert(h <= 64);
	assert(y_step_q4 <= 32 \|\| (y_step_q4 <= 64 && h <= 32));
	assert(x_step_q4 <= 64);

	convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1), src_stride, temp, 64,
	filter, x0_q4, x_step_q4, w, intermediate_height);
	convolve_vert(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, dst_stride, filter,
	y0_q4, y_step_q4, w, h);
	}

	void aom_convolve_copy_c(const uint8_t src, ptrdiff_t src_stride, uint8_t dst,
	ptrdiff_t dst_stride, int w, int h) {
	for (int r = h; r > 0; --r) {
	memmove(dst, src, w);
	src += src_stride;
	dst += dst_stride;
	}
	}

	#if CONFIG_AV1_HIGHBITDEPTH
	static inline int highbd_vert_scalar_product(const uint16_t *a,
	ptrdiff_t a_stride,
	const int16_t *b) {
	int sum = 0;
	for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k * a_stride] * b[k];
	return sum;
	}

	static inline int highbd_horz_scalar_product(const uint16_t *a,
	const int16_t *b) {
	int sum = 0;
	for (int k = 0; k < SUBPEL_TAPS; ++k) sum += a[k] * b[k];
	return sum;
	}

	static void highbd_convolve_horiz(const uint8_t *src8, ptrdiff_t src_stride,
	uint8_t *dst8, ptrdiff_t dst_stride,
	const InterpKernel *x_filters, int x0_q4,
	int x_step_q4, int w, int h, int bd) {
	uint16_t *src = CONVERT_TO_SHORTPTR(src8);
	uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
	src -= SUBPEL_TAPS / 2 - 1;
	for (int y = 0; y < h; ++y) {
	int x_q4 = x0_q4;
	for (int x = 0; x < w; ++x) {
	const uint16_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
	const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
	const int sum = highbd_horz_scalar_product(src_x, x_filter);
	dst[x] = clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd);
	x_q4 += x_step_q4;
	}
	src += src_stride;
	dst += dst_stride;
	}
	}

	static void highbd_convolve_vert(const uint8_t *src8, ptrdiff_t src_stride,
	uint8_t *dst8, ptrdiff_t dst_stride,
	const InterpKernel *y_filters, int y0_q4,
	int y_step_q4, int w, int h, int bd) {
	uint16_t *src = CONVERT_TO_SHORTPTR(src8);
	uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
	src -= src_stride * (SUBPEL_TAPS / 2 - 1);
	for (int x = 0; x < w; ++x) {
	int y_q4 = y0_q4;
	for (int y = 0; y < h; ++y) {
	const uint16_t src_y = &src[(y_q4 >> SUBPEL_BITS) src_stride];
	const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
	const int sum = highbd_vert_scalar_product(src_y, src_stride, y_filter);
	dst[y * dst_stride] =
	clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, FILTER_BITS), bd);
	y_q4 += y_step_q4;
	}
	++src;
	++dst;
	}
	}

	void aom_highbd_convolve8_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const int16_t *filter_x, int x_step_q4,
	const int16_t *filter_y, int y_step_q4, int w,
	int h, int bd) {
	const InterpKernel *const filters_x = get_filter_base(filter_x);
	const int x0_q4 = get_filter_offset(filter_x, filters_x);
	(void)filter_y;
	(void)y_step_q4;

	highbd_convolve_horiz(src, src_stride, dst, dst_stride, filters_x, x0_q4,
	x_step_q4, w, h, bd);
	}

	void aom_highbd_convolve8_vert_c(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const int16_t *filter_x, int x_step_q4,
	const int16_t *filter_y, int y_step_q4, int w,
	int h, int bd) {
	const InterpKernel *const filters_y = get_filter_base(filter_y);
	const int y0_q4 = get_filter_offset(filter_y, filters_y);
	(void)filter_x;
	(void)x_step_q4;

	highbd_convolve_vert(src, src_stride, dst, dst_stride, filters_y, y0_q4,
	y_step_q4, w, h, bd);
	}

	void aom_highbd_convolve_copy_c(const uint16_t *src, ptrdiff_t src_stride,
	uint16_t *dst, ptrdiff_t dst_stride, int w,
	int h) {
	for (int y = 0; y < h; ++y) {
	memmove(dst, src, w * sizeof(src[0]));
	src += src_stride;
	dst += dst_stride;
	}
	}
	#endif // CONFIG_AV1_HIGHBITDEPTH