swr: aarch64 audio_convert and neon clobber test

Ported from avresample
Code by:  Mans Rullgard, Janne Grunau, Martin Storsjo
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/aarch64/Makefile

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

libswresample/aarch64/audio_convert_init.c

+/*
+ * This file is part of libswresample.
+ *
+ * libswresample 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.
+ *
+ * libswresample 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 libswresample; 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 "libswresample/swresample_internal.h"
+#include "libswresample/audioconvert.h"
+
+void swri_oldapi_conv_flt_to_s16_neon(int16_t *dst, const float *src, int len);
+void swri_oldapi_conv_fltp_to_s16_2ch_neon(int16_t *dst, float *const *src, int len, int channels);
+void swri_oldapi_conv_fltp_to_s16_nch_neon(int16_t *dst, float *const *src, int len, int channels);
+
+static void conv_flt_to_s16_neon(uint8_t **dst, const uint8_t **src, int len){
+    swri_oldapi_conv_flt_to_s16_neon((int16_t*)*dst, (const float*)*src, len);
+}
+
+static void conv_fltp_to_s16_2ch_neon(uint8_t **dst, const uint8_t **src, int len){
+    swri_oldapi_conv_fltp_to_s16_2ch_neon((int16_t*)*dst, (float *const*)src, len, 2);
+}
+
+static void conv_fltp_to_s16_nch_neon(uint8_t **dst, const uint8_t **src, int len){
+    int channels;
+    for(channels=3; channels<SWR_CH_MAX && src[channels]; channels++)
+        ;
+    swri_oldapi_conv_fltp_to_s16_nch_neon((int16_t*)*dst, (float *const*)src, len, channels);
+}
+
+av_cold void swri_audio_convert_init_aarch64(struct AudioConvert *ac,
+                                       enum AVSampleFormat out_fmt,
+                                       enum AVSampleFormat in_fmt,
+                                       int channels)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    ac->simd_f= NULL;
+
+    if (have_neon(cpu_flags)) {
+        if(out_fmt == AV_SAMPLE_FMT_S16 && in_fmt == AV_SAMPLE_FMT_FLT || out_fmt == AV_SAMPLE_FMT_S16P && in_fmt == AV_SAMPLE_FMT_FLTP)
+            ac->simd_f = conv_flt_to_s16_neon;
+        if(out_fmt == AV_SAMPLE_FMT_S16 && in_fmt == AV_SAMPLE_FMT_FLTP && channels == 2)
+            ac->simd_f = conv_fltp_to_s16_2ch_neon;
+        if(out_fmt == AV_SAMPLE_FMT_S16 && in_fmt == AV_SAMPLE_FMT_FLTP && channels >  2)
+            ac->simd_f = conv_fltp_to_s16_nch_neon;
+        if(ac->simd_f)
+            ac->in_simd_align_mask = ac->out_simd_align_mask = 15;
+    }
+}

libswresample/aarch64/neontest.c

+/*
+ * check NEON registers for clobbers
+ * Copyright (c) 2013 Martin Storsjo
+ *
+ * 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 "libswresample/swresample.h"
+#include "libavutil/aarch64/neontest.h"
+
+wrap(swr_convert(struct SwrContext *s, uint8_t **out, int out_count,
+                 const uint8_t **in , int in_count))
+{
+    testneonclobbers(swr_convert, s, out, out_count, in, in_count);
+}

libswresample/audioconvert.c

@@ -156,6 +156,7 @@ AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt,
 
     if(HAVE_YASM && HAVE_MMX) swri_audio_convert_init_x86(ctx, out_fmt, in_fmt, channels);
     if(ARCH_ARM)              swri_audio_convert_init_arm(ctx, out_fmt, in_fmt, channels);
+    if(ARCH_AARCH64)          swri_audio_convert_init_aarch64(ctx, out_fmt, in_fmt, channels);
 
     return ctx;
 }

libswresample/swresample_internal.h

@@ -188,6 +188,10 @@ void swri_rematrix_init_x86(struct SwrContext *s);
 void swri_get_dither(SwrContext *s, void *dst, int len, unsigned seed, enum AVSampleFormat noise_fmt);
 int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt);
 
+void swri_audio_convert_init_aarch64(struct AudioConvert *ac,
+                                 enum AVSampleFormat out_fmt,
+                                 enum AVSampleFormat in_fmt,
+                                 int channels);
 void swri_audio_convert_init_arm(struct AudioConvert *ac,
                                  enum AVSampleFormat out_fmt,
                                  enum AVSampleFormat in_fmt,