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Diffstat (limited to '')
-rw-r--r-- | third_party/aom/aom_dsp/aom_convolve.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/aom_convolve.c b/third_party/aom/aom_dsp/aom_convolve.c new file mode 100644 index 0000000000..254f6401c7 --- /dev/null +++ b/third_party/aom/aom_dsp/aom_convolve.c @@ -0,0 +1,261 @@ +/* + * 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_convolve8_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_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) { + aom_convolve8_c(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4, + 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 |