swscale: aarch64: Add a NEON implementation of interleaveBytes

This allows speeding up format conversions from yuv420 to nv12.

                             Cortex A53      A72      A73
interleave_bytes_c:             86077.5  51433.0  66972.0
interleave_bytes_neon:          19701.7  23019.2  15859.2
interleave_bytes_aligned_c:     86603.0  52017.2  67484.2
interleave_bytes_aligned_neon:   9061.0   7623.0   6309.0

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 41 insertions, 0 deletions

diff --git a/libswscale/aarch64/rgb2rgb.c b/libswscale/aarch64/rgb2rgb.c
new file mode 100644
index 0000000000..a9bf6ff9e0
--- /dev/null
+++ b/libswscale/aarch64/rgb2rgb.c
@@ -0,0 +1,41 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/aarch64/cpu.h"
+#include "libavutil/cpu.h"
+#include "libavutil/bswap.h"
+#include "libswscale/rgb2rgb.h"
+#include "libswscale/swscale.h"
+#include "libswscale/swscale_internal.h"
+
+void ff_interleave_bytes_neon(const uint8_t *src1, const uint8_t *src2,
+                              uint8_t *dest, int width, int height,
+                              int src1Stride, int src2Stride, int dstStride);
+
+av_cold void rgb2rgb_init_aarch64(void)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags)) {
+        interleaveBytes = ff_interleave_bytes_neon;
+    }
+}