aarch64: NEON float to s16 audio conversion

libavresample/aarch64/Makefile

+OBJS                             += aarch64/audio_convert_init.o
+
 OBJS-$(CONFIG_NEON_CLOBBER_TEST) += aarch64/neontest.o
+
+NEON-OBJS                        += aarch64/audio_convert_neon.o

libavresample/aarch64/audio_convert_init.c

+/*
+ * 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 "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/aarch64/cpu.h"
+#include "libavutil/samplefmt.h"
+#include "libavresample/audio_convert.h"
+
+void ff_conv_flt_to_s16_neon(int16_t *dst, const float *src, int len);
+void ff_conv_fltp_to_s16_neon(int16_t *dst, float *const *src,
+                              int len, int channels);
+void ff_conv_fltp_to_s16_2ch_neon(int16_t *dst, float *const *src,
+                                  int len, int channels);
+
+av_cold void ff_audio_convert_init_aarch64(AudioConvert *ac)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags)) {
+        ff_audio_convert_set_func(ac, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT,
+                                  0, 16, 8, "NEON",
+                                  ff_conv_flt_to_s16_neon);
+        ff_audio_convert_set_func(ac, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLTP,
+                                  2, 16, 8, "NEON",
+                                  ff_conv_fltp_to_s16_2ch_neon);
+        ff_audio_convert_set_func(ac, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLTP,
+                                  0, 16, 8, "NEON",
+                                  ff_conv_fltp_to_s16_neon);
+    }
+}

libavresample/audio_convert.c

@@ -301,6 +301,8 @@ AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr,
 
     set_generic_function(ac);
 
+    if (ARCH_AARCH64)
+        ff_audio_convert_init_aarch64(ac);
     if (ARCH_ARM)
         ff_audio_convert_init_arm(ac);
     if (ARCH_X86)

libavresample/audio_convert.h

@@ -96,6 +96,7 @@ int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in);
 
 /* arch-specific initialization functions */
 
+void ff_audio_convert_init_aarch64(AudioConvert *ac);
 void ff_audio_convert_init_arm(AudioConvert *ac);
 void ff_audio_convert_init_x86(AudioConvert *ac);