1 files changed, 72 insertions, 0 deletions
diff --git a/thirdparty/libvpx/vpx_dsp/arm/vpx_convolve_neon.c b/thirdparty/libvpx/vpx_dsp/arm/vpx_convolve_neon.c
new file mode 100644
index 0000000000..1506ce6203
--- /dev/null
+++ b/thirdparty/libvpx/vpx_dsp/arm/vpx_convolve_neon.c
@@ -0,0 +1,72 @@
+/*
+ *  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 <assert.h>
+
+#include "./vpx_dsp_rtcd.h"
+#include "vpx_dsp/vpx_dsp_common.h"
+#include "vpx_ports/mem.h"
+
+void 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) {
+  /* 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).
+   */
+  DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
+
+  // Account for the vertical phase needing 3 lines prior and 4 lines post
+  int intermediate_height = h + 7;
+
+  assert(y_step_q4 == 16);
+  assert(x_step_q4 == 16);
+
+  /* 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.
+   */
+  vpx_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 */
+  vpx_convolve8_vert_neon(temp + 64 * 3, 64,
+                          dst, dst_stride,
+                          filter_x, x_step_q4, filter_y, y_step_q4,
+                          w, h);
+}
+
+void 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) {
+  DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
+  int intermediate_height = h + 7;
+
+  assert(y_step_q4 == 16);
+  assert(x_step_q4 == 16);
+
+  /* This implementation has the same issues as above. In addition, we only want
+   * to average the values after both passes.
+   */
+  vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride,
+                           temp, 64,
+                           filter_x, x_step_q4, filter_y, y_step_q4,
+                           w, intermediate_height);
+  vpx_convolve8_avg_vert_neon(temp + 64 * 3,
+                              64, dst, dst_stride,
+                              filter_x, x_step_q4, filter_y, y_step_q4,
+                              w, h);
+}