2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
13 #include "./vpx_config.h"
14 #include "./vp9_rtcd.h"
15 #include "vp9/common/vp9_common.h"
16 #include "vp9/common/vp9_convolve.h"
17 #include "vp9/common/vp9_filter.h"
18 #include "vpx/vpx_integer.h"
19 #include "vpx_ports/mem.h"
21 static void convolve_horiz(const uint8_t *src, ptrdiff_t src_stride,
22 uint8_t *dst, ptrdiff_t dst_stride,
23 const InterpKernel *x_filters,
24 int x0_q4, int x_step_q4, int w, int h) {
26 src -= SUBPEL_TAPS / 2 - 1;
27 for (y = 0; y < h; ++y) {
29 for (x = 0; x < w; ++x) {
30 const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
31 const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
33 for (k = 0; k < SUBPEL_TAPS; ++k)
34 sum += src_x[k] * x_filter[k];
35 dst[x] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
43 static void convolve_avg_horiz(const uint8_t *src, ptrdiff_t src_stride,
44 uint8_t *dst, ptrdiff_t dst_stride,
45 const InterpKernel *x_filters,
46 int x0_q4, int x_step_q4, int w, int h) {
48 src -= SUBPEL_TAPS / 2 - 1;
49 for (y = 0; y < h; ++y) {
51 for (x = 0; x < w; ++x) {
52 const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
53 const int16_t *const x_filter = x_filters[x_q4 & SUBPEL_MASK];
55 for (k = 0; k < SUBPEL_TAPS; ++k)
56 sum += src_x[k] * x_filter[k];
57 dst[x] = ROUND_POWER_OF_TWO(dst[x] +
58 clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS)), 1);
66 static void convolve_vert(const uint8_t *src, ptrdiff_t src_stride,
67 uint8_t *dst, ptrdiff_t dst_stride,
68 const InterpKernel *y_filters,
69 int y0_q4, int y_step_q4, int w, int h) {
71 src -= src_stride * (SUBPEL_TAPS / 2 - 1);
73 for (x = 0; x < w; ++x) {
75 for (y = 0; y < h; ++y) {
76 const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
77 const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
79 for (k = 0; k < SUBPEL_TAPS; ++k)
80 sum += src_y[k * src_stride] * y_filter[k];
81 dst[y * dst_stride] = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
89 static void convolve_avg_vert(const uint8_t *src, ptrdiff_t src_stride,
90 uint8_t *dst, ptrdiff_t dst_stride,
91 const InterpKernel *y_filters,
92 int y0_q4, int y_step_q4, int w, int h) {
94 src -= src_stride * (SUBPEL_TAPS / 2 - 1);
96 for (x = 0; x < w; ++x) {
98 for (y = 0; y < h; ++y) {
99 const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
100 const int16_t *const y_filter = y_filters[y_q4 & SUBPEL_MASK];
102 for (k = 0; k < SUBPEL_TAPS; ++k)
103 sum += src_y[k * src_stride] * y_filter[k];
104 dst[y * dst_stride] = ROUND_POWER_OF_TWO(dst[y * dst_stride] +
105 clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS)), 1);
113 static void convolve(const uint8_t *src, ptrdiff_t src_stride,
114 uint8_t *dst, ptrdiff_t dst_stride,
115 const InterpKernel *const x_filters,
116 int x0_q4, int x_step_q4,
117 const InterpKernel *const y_filters,
118 int y0_q4, int y_step_q4,
120 // Fixed size intermediate buffer places limits on parameters.
121 // Maximum intermediate_height is 324, for y_step_q4 == 80,
122 // h == 64, taps == 8.
123 // y_step_q4 of 80 allows for 1/10 scale for 5 layer svc
124 uint8_t temp[64 * 324];
125 int intermediate_height = (((h - 1) * y_step_q4 + 15) >> 4) + SUBPEL_TAPS;
129 assert(y_step_q4 <= 80);
130 assert(x_step_q4 <= 80);
132 if (intermediate_height < h)
133 intermediate_height = h;
135 convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1), src_stride, temp, 64,
136 x_filters, x0_q4, x_step_q4, w, intermediate_height);
137 convolve_vert(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, dst_stride,
138 y_filters, y0_q4, y_step_q4, w, h);
141 static const InterpKernel *get_filter_base(const int16_t *filter) {
142 // NOTE: This assumes that the filter table is 256-byte aligned.
143 // TODO(agrange) Modify to make independent of table alignment.
144 return (const InterpKernel *)(((intptr_t)filter) & ~((intptr_t)0xFF));
147 static int get_filter_offset(const int16_t *f, const InterpKernel *base) {
148 return (int)((const InterpKernel *)(intptr_t)f - base);
151 void vp9_convolve8_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
152 uint8_t *dst, ptrdiff_t dst_stride,
153 const int16_t *filter_x, int x_step_q4,
154 const int16_t *filter_y, int y_step_q4,
156 const InterpKernel *const filters_x = get_filter_base(filter_x);
157 const int x0_q4 = get_filter_offset(filter_x, filters_x);
159 convolve_horiz(src, src_stride, dst, dst_stride, filters_x,
160 x0_q4, x_step_q4, w, h);
163 void vp9_convolve8_avg_horiz_c(const uint8_t *src, ptrdiff_t src_stride,
164 uint8_t *dst, ptrdiff_t dst_stride,
165 const int16_t *filter_x, int x_step_q4,
166 const int16_t *filter_y, int y_step_q4,
168 const InterpKernel *const filters_x = get_filter_base(filter_x);
169 const int x0_q4 = get_filter_offset(filter_x, filters_x);
171 convolve_avg_horiz(src, src_stride, dst, dst_stride, filters_x,
172 x0_q4, x_step_q4, w, h);
175 void vp9_convolve8_vert_c(const uint8_t *src, ptrdiff_t src_stride,
176 uint8_t *dst, ptrdiff_t dst_stride,
177 const int16_t *filter_x, int x_step_q4,
178 const int16_t *filter_y, int y_step_q4,
180 const InterpKernel *const filters_y = get_filter_base(filter_y);
181 const int y0_q4 = get_filter_offset(filter_y, filters_y);
182 convolve_vert(src, src_stride, dst, dst_stride, filters_y,
183 y0_q4, y_step_q4, w, h);
186 void vp9_convolve8_avg_vert_c(const uint8_t *src, ptrdiff_t src_stride,
187 uint8_t *dst, ptrdiff_t dst_stride,
188 const int16_t *filter_x, int x_step_q4,
189 const int16_t *filter_y, int y_step_q4,
191 const InterpKernel *const filters_y = get_filter_base(filter_y);
192 const int y0_q4 = get_filter_offset(filter_y, filters_y);
193 convolve_avg_vert(src, src_stride, dst, dst_stride, filters_y,
194 y0_q4, y_step_q4, w, h);
197 void vp9_convolve8_c(const uint8_t *src, ptrdiff_t src_stride,
198 uint8_t *dst, ptrdiff_t dst_stride,
199 const int16_t *filter_x, int x_step_q4,
200 const int16_t *filter_y, int y_step_q4,
202 const InterpKernel *const filters_x = get_filter_base(filter_x);
203 const int x0_q4 = get_filter_offset(filter_x, filters_x);
205 const InterpKernel *const filters_y = get_filter_base(filter_y);
206 const int y0_q4 = get_filter_offset(filter_y, filters_y);
208 convolve(src, src_stride, dst, dst_stride,
209 filters_x, x0_q4, x_step_q4,
210 filters_y, y0_q4, y_step_q4, w, h);
213 void vp9_convolve8_avg_c(const uint8_t *src, ptrdiff_t src_stride,
214 uint8_t *dst, ptrdiff_t dst_stride,
215 const int16_t *filter_x, int x_step_q4,
216 const int16_t *filter_y, int y_step_q4,
218 /* Fixed size intermediate buffer places limits on parameters. */
219 DECLARE_ALIGNED_ARRAY(16, uint8_t, temp, 64 * 64);
223 vp9_convolve8_c(src, src_stride, temp, 64,
224 filter_x, x_step_q4, filter_y, y_step_q4, w, h);
225 vp9_convolve_avg_c(temp, 64, dst, dst_stride, NULL, 0, NULL, 0, w, h);
228 void vp9_convolve_copy_c(const uint8_t *src, ptrdiff_t src_stride,
229 uint8_t *dst, ptrdiff_t dst_stride,
230 const int16_t *filter_x, int filter_x_stride,
231 const int16_t *filter_y, int filter_y_stride,
235 for (r = h; r > 0; --r) {
236 vpx_memcpy(dst, src, w);
242 void vp9_convolve_avg_c(const uint8_t *src, ptrdiff_t src_stride,
243 uint8_t *dst, ptrdiff_t dst_stride,
244 const int16_t *filter_x, int filter_x_stride,
245 const int16_t *filter_y, int filter_y_stride,
249 for (y = 0; y < h; ++y) {
250 for (x = 0; x < w; ++x)
251 dst[x] = ROUND_POWER_OF_TWO(dst[x] + src[x], 1);