1 /*
2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
3 *
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.
9 */
10
11 #include <assert.h>
12
13 #include "./vpx_dsp_rtcd.h"
14 #include "vpx_dsp/vpx_dsp_common.h"
15 #include "vpx_ports/mem.h"
16
vpx_convolve8_neon(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)17 void vpx_convolve8_neon(const uint8_t *src, ptrdiff_t src_stride,
18 uint8_t *dst, ptrdiff_t dst_stride,
19 const int16_t *filter_x, int x_step_q4,
20 const int16_t *filter_y, int y_step_q4,
21 int w, int h) {
22 /* Given our constraints: w <= 64, h <= 64, taps == 8 we can reduce the
23 * maximum buffer size to 64 * 64 + 7 (+ 1 to make it divisible by 4).
24 */
25 DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
26
27 // Account for the vertical phase needing 3 lines prior and 4 lines post
28 int intermediate_height = h + 7;
29
30 assert(y_step_q4 == 16);
31 assert(x_step_q4 == 16);
32
33 /* Filter starting 3 lines back. The neon implementation will ignore the
34 * given height and filter a multiple of 4 lines. Since this goes in to
35 * the temp buffer which has lots of extra room and is subsequently discarded
36 * this is safe if somewhat less than ideal.
37 */
38 vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride,
39 temp, 64,
40 filter_x, x_step_q4, filter_y, y_step_q4,
41 w, intermediate_height);
42
43 /* Step into the temp buffer 3 lines to get the actual frame data */
44 vpx_convolve8_vert_neon(temp + 64 * 3, 64,
45 dst, dst_stride,
46 filter_x, x_step_q4, filter_y, y_step_q4,
47 w, h);
48 }
49
vpx_convolve8_avg_neon(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)50 void vpx_convolve8_avg_neon(const uint8_t *src, ptrdiff_t src_stride,
51 uint8_t *dst, ptrdiff_t dst_stride,
52 const int16_t *filter_x, int x_step_q4,
53 const int16_t *filter_y, int y_step_q4,
54 int w, int h) {
55 DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
56 int intermediate_height = h + 7;
57
58 assert(y_step_q4 == 16);
59 assert(x_step_q4 == 16);
60
61 /* This implementation has the same issues as above. In addition, we only want
62 * to average the values after both passes.
63 */
64 vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride,
65 temp, 64,
66 filter_x, x_step_q4, filter_y, y_step_q4,
67 w, intermediate_height);
68 vpx_convolve8_avg_vert_neon(temp + 64 * 3,
69 64, dst, dst_stride,
70 filter_x, x_step_q4, filter_y, y_step_q4,
71 w, h);
72 }
73