arm64: convert dcadsp neon asm from arm

~2% faster dts decoding overall.

                    cortex-a57   cortex-a53
dca_decode_hf_c:    474.8        1659.9
dca_decode_hf_neon: 225.2         301.1
dca_lfe_fir0_c:     913.2        1537.7
dca_lfe_fir0_neon:  286.8         451.9
dca_lfe_fir1_c:     848.7        1711.5
dca_lfe_fir1_neon:  387.1         506.4

1 files changed, 51 insertions, 0 deletions

diff --git a/libavcodec/aarch64/dcadsp_init.c b/libavcodec/aarch64/dcadsp_init.c
new file mode 100644
index 0000000000..ad910700f0
--- /dev/null
+++ b/libavcodec/aarch64/dcadsp_init.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
+ *
+ * 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 "config.h"
+
+#include "libavutil/aarch64/cpu.h"
+#include "libavutil/attributes.h"
+#include "libavcodec/dcadsp.h"
+
+void ff_dca_lfe_fir0_neon(float *out, const float *in, const float *coefs);
+void ff_dca_lfe_fir1_neon(float *out, const float *in, const float *coefs);
+
+void ff_synth_filter_float_neon(FFTContext *imdct,
+                                float *synth_buf_ptr, int *synth_buf_offset,
+                                float synth_buf2[32], const float window[512],
+                                float out[32], const float in[32],
+                                float scale);
+
+void ff_decode_hf_neon(float dst[DCA_SUBBANDS][8],
+                       const int32_t vq_num[DCA_SUBBANDS],
+                       const int8_t hf_vq[1024][32], intptr_t vq_offset,
+                       int32_t scale[DCA_SUBBANDS][2],
+                       intptr_t start, intptr_t end);
+
+av_cold void ff_dcadsp_init_aarch64(DCADSPContext *s)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags)) {
+        s->lfe_fir[0] = ff_dca_lfe_fir0_neon;
+        s->lfe_fir[1] = ff_dca_lfe_fir1_neon;
+        s->decode_hf  = ff_decode_hf_neon;
+    }
+}