mirror of
https://github.com/danog/libtgvoip.git
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5caaaafa42
I'm now using the entire audio processing module from WebRTC as opposed to individual DSP algorithms pulled from there before. Seems to work better this way.
68 lines
2.3 KiB
C++
68 lines
2.3 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/simd/sinc_resampler_sse.cc
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#include "rtc_base/system/arch.h"
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#ifdef WEBRTC_ARCH_X86_FAMILY
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#include <stddef.h>
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#include <stdint.h>
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#include <xmmintrin.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_SSE(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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__m128 m_input;
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__m128 m_sums1 = _mm_setzero_ps();
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__m128 m_sums2 = _mm_setzero_ps();
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// Based on |input_ptr| alignment, we need to use loadu or load. Unrolling
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// these loops hurt performance in local testing.
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if (reinterpret_cast<uintptr_t>(input_ptr) & 0x0F) {
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for (size_t i = 0; i < kKernelSize; i += 4) {
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m_input = _mm_loadu_ps(input_ptr + i);
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m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i)));
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m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i)));
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}
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} else {
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for (size_t i = 0; i < kKernelSize; i += 4) {
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m_input = _mm_load_ps(input_ptr + i);
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m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i)));
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m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i)));
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}
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}
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// Linearly interpolate the two "convolutions".
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m_sums1 = _mm_mul_ps(
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m_sums1,
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_mm_set_ps1(static_cast<float>(1.0 - kernel_interpolation_factor)));
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m_sums2 = _mm_mul_ps(
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m_sums2, _mm_set_ps1(static_cast<float>(kernel_interpolation_factor)));
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m_sums1 = _mm_add_ps(m_sums1, m_sums2);
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// Sum components together.
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float result;
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m_sums2 = _mm_add_ps(_mm_movehl_ps(m_sums1, m_sums1), m_sums1);
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_mm_store_ss(&result,
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_mm_add_ss(m_sums2, _mm_shuffle_ps(m_sums2, m_sums2, 1)));
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return result;
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}
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} // namespace webrtc
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#endif
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