49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Modified from the Chromium original:
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// src/media/base/sinc_resampler.cc
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#include <arm_neon.h>
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#include "common_audio/resampler/sinc_resampler.h"
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namespace webrtc {
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float SincResampler::Convolve_NEON(const float* input_ptr,
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const float* k1,
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const float* k2,
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double kernel_interpolation_factor) {
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float32x4_t m_input;
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float32x4_t m_sums1 = vmovq_n_f32(0);
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float32x4_t m_sums2 = vmovq_n_f32(0);
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const float* upper = input_ptr + kKernelSize;
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for (; input_ptr < upper;) {
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m_input = vld1q_f32(input_ptr);
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input_ptr += 4;
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m_sums1 = vmlaq_f32(m_sums1, m_input, vld1q_f32(k1));
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k1 += 4;
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m_sums2 = vmlaq_f32(m_sums2, m_input, vld1q_f32(k2));
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k2 += 4;
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}
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// Linearly interpolate the two "convolutions".
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m_sums1 = vmlaq_f32(
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vmulq_f32(m_sums1, vmovq_n_f32(1.0 - kernel_interpolation_factor)),
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m_sums2, vmovq_n_f32(kernel_interpolation_factor));
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// Sum components together.
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float32x2_t m_half = vadd_f32(vget_high_f32(m_sums1), vget_low_f32(m_sums1));
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return vget_lane_f32(vpadd_f32(m_half, m_half), 0);
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}
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} // namespace webrtc
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