aarch64: NEON fixed/floating point MPADSP apply_window

30%/25% (fixed/float) faster mp3 decoding on Apple's A7. The floating
point decoder is approximately 7% faster.

1 files changed, 39 insertions, 0 deletions

diff --git a/libavcodec/aarch64/mpegaudiodsp_init.c b/libavcodec/aarch64/mpegaudiodsp_init.c
new file mode 100644
index 0000000000..a8b2baf955
--- /dev/null
+++ b/libavcodec/aarch64/mpegaudiodsp_init.c
@@ -0,0 +1,39 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/aarch64/cpu.h"
+#include "libavcodec/mpegaudiodsp.h"
+#include "config.h"
+
+void ff_mpadsp_apply_window_fixed_neon(int32_t *synth_buf, int32_t *window,
+                                       int *dither, int16_t *samples, int incr);
+void ff_mpadsp_apply_window_float_neon(float *synth_buf, float *window,
+                                       int *dither, float *samples, int incr);
+
+av_cold void ff_mpadsp_init_aarch64(MPADSPContext *s)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags)) {
+        s->apply_window_fixed = ff_mpadsp_apply_window_fixed_neon;
+        s->apply_window_float = ff_mpadsp_apply_window_float_neon;
+    }
+}