vp9_convolve_neon.c 3.3 KB
Newer Older
Johann's avatar
Johann committed
1
2
3
4
5
6
7
8
9
10
11
12
/*
 *  Copyright (c) 2013 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 "./vp9_rtcd.h"
#include "vp9/common/vp9_common.h"
13
#include "vpx_ports/mem.h"
Johann's avatar
Johann committed
14
15
16
17
18
19
20
21
22

void vp9_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) {
  /* Given our constraints: w <= 64, h <= 64, taps == 8 we can reduce the
   * maximum buffer size to 64 * 64 + 7 (+ 1 to make it divisible by 4).
   */
23
  DECLARE_ALIGNED_ARRAY(8, uint8_t, temp, 64 * 72);
Johann's avatar
Johann committed
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

  // Account for the vertical phase needing 3 lines prior and 4 lines post
  int intermediate_height = h + 7;

  if (x_step_q4 != 16 || y_step_q4 != 16)
    return vp9_convolve8_c(src, src_stride,
                           dst, dst_stride,
                           filter_x, x_step_q4,
                           filter_y, y_step_q4,
                           w, h);

  /* Filter starting 3 lines back. The neon implementation will ignore the
   * given height and filter a multiple of 4 lines. Since this goes in to
   * the temp buffer which has lots of extra room and is subsequently discarded
   * this is safe if somewhat less than ideal.
   */
  vp9_convolve8_horiz_neon(src - src_stride * 3, src_stride,
                           temp, 64,
                           filter_x, x_step_q4, filter_y, y_step_q4,
                           w, intermediate_height);

  /* Step into the temp buffer 3 lines to get the actual frame data */
  vp9_convolve8_vert_neon(temp + 64 * 3, 64,
                          dst, dst_stride,
                          filter_x, x_step_q4, filter_y, y_step_q4,
                          w, h);
}

void vp9_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) {
57
  DECLARE_ALIGNED_ARRAY(8, uint8_t, temp, 64 * 72);
Johann's avatar
Johann committed
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
  int intermediate_height = h + 7;

  if (x_step_q4 != 16 || y_step_q4 != 16)
    return vp9_convolve8_avg_c(src, src_stride,
                               dst, dst_stride,
                               filter_x, x_step_q4,
                               filter_y, y_step_q4,
                               w, h);

  /* This implementation has the same issues as above. In addition, we only want
   * to average the values after both passes.
   */
  vp9_convolve8_horiz_neon(src - src_stride * 3, src_stride,
                           temp, 64,
                           filter_x, x_step_q4, filter_y, y_step_q4,
                           w, intermediate_height);
  vp9_convolve8_avg_vert_neon(temp + 64 * 3,
                              64, dst, dst_stride,
                              filter_x, x_step_q4, filter_y, y_step_q4,
                              w, h);
}