1 files changed, 68 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_dsp/arm/vpx_convolve_neon.c b/media/libvpx/libvpx/vpx_dsp/arm/vpx_convolve_neon.c
new file mode 100644
index 0000000000..57772ea668
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_dsp/arm/vpx_convolve_neon.c
@@ -0,0 +1,68 @@
+/*
+ *  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_dsp/vpx_filter.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 InterpKernel *filter,
+                        int x0_q4, int x_step_q4, int y0_q4, 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).
+   */
+  uint8_t temp[64 * 72];
+
+  const int vert_filter_taps = vpx_get_filter_taps(filter[y0_q4]) <= 4 ? 4 : 8;
+  /* Account for the vertical phase needing vert_filter_taps / 2 - 1 lines prior
+   * and vert_filter_taps / 2 lines post. (+1 to make total divisible by 4.) */
+  const int intermediate_height = h + vert_filter_taps;
+  const ptrdiff_t border_offset = vert_filter_taps / 2 - 1;
+
+  assert(y_step_q4 == 16);
+  assert(x_step_q4 == 16);
+
+  /* Filter starting border_offset 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 * border_offset, src_stride, temp,
+                           w, filter, x0_q4, x_step_q4, y0_q4, y_step_q4, w,
+                           intermediate_height);
+
+  /* Step into the temp buffer border_offset lines to get actual frame data. */
+  vpx_convolve8_vert_neon(temp + w * border_offset, w, dst, dst_stride, filter,
+                          x0_q4, x_step_q4, y0_q4, 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 InterpKernel *filter, int x0_q4,
+                            int x_step_q4, int y0_q4, int y_step_q4, int w,
+                            int h) {
+  uint8_t temp[64 * 72];
+  const int intermediate_height = h + 8;
+
+  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, w, filter,
+                           x0_q4, x_step_q4, y0_q4, y_step_q4, w,
+                           intermediate_height);
+  vpx_convolve8_avg_vert_neon(temp + w * 3, w, dst, dst_stride, filter, x0_q4,
+                              x_step_q4, y0_q4, y_step_q4, w, h);
+}