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_dsp_rtcd.h"
14 #include "vpx_dsp/vpx_dsp_common.h"
15 #include "vpx_ports/mem.h"
17 void vpx_convolve8_neon(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst,
18 ptrdiff_t dst_stride, const int16_t *filter_x,
19 int x_step_q4, const int16_t *filter_y, int y_step_q4,
21 /* Given our constraints: w <= 64, h <= 64, taps == 8 we can reduce the
22 * maximum buffer size to 64 * 64 + 7 (+ 1 to make it divisible by 4).
24 uint8_t temp[64 * 72];
26 // Account for the vertical phase needing 3 lines prior and 4 lines post
27 const int intermediate_height = h + 7;
29 assert(y_step_q4 == 16);
30 assert(x_step_q4 == 16);
32 /* Filter starting 3 lines back. The neon implementation will ignore the given
33 * height and filter a multiple of 4 lines. Since this goes in to the temp
34 * buffer which has lots of extra room and is subsequently discarded this is
35 * safe if somewhat less than ideal. */
36 vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, w, filter_x,
37 x_step_q4, filter_y, y_step_q4, w,
40 /* Step into the temp buffer 3 lines to get the actual frame data */
41 vpx_convolve8_vert_neon(temp + w * 3, w, dst, dst_stride, filter_x, x_step_q4,
42 filter_y, y_step_q4, w, h);
45 void vpx_convolve8_avg_neon(const uint8_t *src, ptrdiff_t src_stride,
46 uint8_t *dst, ptrdiff_t dst_stride,
47 const int16_t *filter_x, int x_step_q4,
48 const int16_t *filter_y, int y_step_q4, int w,
50 uint8_t temp[64 * 72];
51 const int intermediate_height = h + 7;
53 assert(y_step_q4 == 16);
54 assert(x_step_q4 == 16);
56 /* This implementation has the same issues as above. In addition, we only want
57 * to average the values after both passes.
59 vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, w, filter_x,
60 x_step_q4, filter_y, y_step_q4, w,
62 vpx_convolve8_avg_vert_neon(temp + w * 3, w, dst, dst_stride, filter_x,
63 x_step_q4, filter_y, y_step_q4, w, h);