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https://github.com/eried/portapack-mayhem.git
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052fd1c407
Performance boost as compiler is no longer updating member variable every pass through the loop.
79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __CHANNEL_STATS_COLLECTOR_H__
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#define __CHANNEL_STATS_COLLECTOR_H__
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#include "dsp_types.hpp"
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#include "simd.hpp"
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#include "message.hpp"
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#include "utility.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <hal.h>
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class ChannelStatsCollector {
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public:
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template<typename Callback>
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void feed(const buffer_c16_t& src, Callback callback) {
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max_squared = compute_max_squared(src, max_squared);
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count += src.count;
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const size_t samples_per_update = src.sampling_rate * update_interval;
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if( count >= samples_per_update ) {
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const float max_squared_f = max_squared;
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const int32_t max_db = mag2_to_dbv_norm(max_squared_f * (1.0f / (32768.0f * 32768.0f)));
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callback({ max_db, count });
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max_squared = 0;
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count = 0;
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}
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}
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private:
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static constexpr float update_interval { 0.1f };
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uint32_t max_squared { 0 };
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size_t count { 0 };
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static uint32_t compute_max_squared(
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const buffer_c16_t& src,
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uint32_t max_squared
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) {
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auto p = simd32_ptr(src.p);
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const auto end_p = simd32_ptr(&src.p[src.count]);
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while(p < end_p) {
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const uint32_t sample = *(p++);
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const uint32_t mag_sq = __SMUAD(sample, sample);
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if( mag_sq > max_squared ) {
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max_squared = mag_sq;
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}
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}
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return max_squared;
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}
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};
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#endif/*__CHANNEL_STATS_COLLECTOR_H__*/
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