1 files changed, 112 insertions, 0 deletions
diff --git a/external/opus-1.1.4/silk/arm/NSQ_neon.c b/external/opus-1.1.4/silk/arm/NSQ_neon.c
new file mode 100644
index 0000000..9642529
--- /dev/null
+++ b/external/opus-1.1.4/silk/arm/NSQ_neon.c
@@ -0,0 +1,112 @@
+/***********************************************************************
+Copyright (C) 2014 Vidyo
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <arm_neon.h>
+#include "main.h"
+#include "stack_alloc.h"
+#include "NSQ.h"
+#include "celt/cpu_support.h"
+#include "celt/arm/armcpu.h"
+
+opus_int32 silk_noise_shape_quantizer_short_prediction_neon(const opus_int32 *buf32, const opus_int32 *coef32, opus_int order)
+{
+    int32x4_t coef0 = vld1q_s32(coef32);
+    int32x4_t coef1 = vld1q_s32(coef32 + 4);
+    int32x4_t coef2 = vld1q_s32(coef32 + 8);
+    int32x4_t coef3 = vld1q_s32(coef32 + 12);
+
+    int32x4_t a0 = vld1q_s32(buf32 - 15);
+    int32x4_t a1 = vld1q_s32(buf32 - 11);
+    int32x4_t a2 = vld1q_s32(buf32 - 7);
+    int32x4_t a3 = vld1q_s32(buf32 - 3);
+
+    int32x4_t b0 = vqdmulhq_s32(coef0, a0);
+    int32x4_t b1 = vqdmulhq_s32(coef1, a1);
+    int32x4_t b2 = vqdmulhq_s32(coef2, a2);
+    int32x4_t b3 = vqdmulhq_s32(coef3, a3);
+
+    int32x4_t c0 = vaddq_s32(b0, b1);
+    int32x4_t c1 = vaddq_s32(b2, b3);
+
+    int32x4_t d = vaddq_s32(c0, c1);
+
+    int64x2_t e = vpaddlq_s32(d);
+
+    int64x1_t f = vadd_s64(vget_low_s64(e), vget_high_s64(e));
+
+    opus_int32 out = vget_lane_s32(vreinterpret_s32_s64(f), 0);
+
+    out += silk_RSHIFT( order, 1 );
+
+    return out;
+}
+
+
+opus_int32 silk_NSQ_noise_shape_feedback_loop_neon(const opus_int32 *data0, opus_int32 *data1, const opus_int16 *coef, opus_int order)
+{
+    opus_int32 out;
+    if (order == 8)
+    {
+        int32x4_t a00 = vdupq_n_s32(data0[0]);
+        int32x4_t a01 = vld1q_s32(data1);  /* data1[0] ... [3] */
+
+        int32x4_t a0 = vextq_s32 (a00, a01, 3); /* data0[0] data1[0] ...[2] */
+        int32x4_t a1 = vld1q_s32(data1 + 3);  /* data1[3] ... [6] */
+
+        /*TODO: Convert these once in advance instead of once per sample, like
+          silk_noise_shape_quantizer_short_prediction_neon() does.*/
+        int16x8_t coef16 = vld1q_s16(coef);
+        int32x4_t coef0 = vmovl_s16(vget_low_s16(coef16));
+        int32x4_t coef1 = vmovl_s16(vget_high_s16(coef16));
+
+        /*This is not bit-exact with the C version, since we do not drop the
+          lower 16 bits of each multiply, but wait until the end to truncate
+          precision. This is an encoder-specific calculation (and unlike
+          silk_noise_shape_quantizer_short_prediction_neon(), is not meant to
+          simulate what the decoder will do). We still could use vqdmulhq_s32()
+          like silk_noise_shape_quantizer_short_prediction_neon() and save
+          half the multiplies, but the speed difference is not large, since we
+          then need two extra adds.*/
+        int64x2_t b0 = vmull_s32(vget_low_s32(a0), vget_low_s32(coef0));
+        int64x2_t b1 = vmlal_s32(b0, vget_high_s32(a0), vget_high_s32(coef0));
+        int64x2_t b2 = vmlal_s32(b1, vget_low_s32(a1), vget_low_s32(coef1));
+        int64x2_t b3 = vmlal_s32(b2, vget_high_s32(a1), vget_high_s32(coef1));
+
+        int64x1_t c = vadd_s64(vget_low_s64(b3), vget_high_s64(b3));
+        int64x1_t cS = vrshr_n_s64(c, 15);
+        int32x2_t d = vreinterpret_s32_s64(cS);
+
+        out = vget_lane_s32(d, 0);
+        vst1q_s32(data1, a0);
+        vst1q_s32(data1 + 4, a1);
+        return out;
+    }
+    return silk_NSQ_noise_shape_feedback_loop_c(data0, data1, coef, order);
+}