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 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 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
