mirror of
https://github.com/eried/portapack-mayhem.git
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96 lines
2.6 KiB
C++
96 lines
2.6 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 __AUDIO_STATS_COLLECTOR_H__
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#define __AUDIO_STATS_COLLECTOR_H__
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#include "buffer.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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class AudioStatsCollector {
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public:
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template<typename Callback>
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void feed(const buffer_s16_t& src, Callback callback) {
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consume_audio_buffer(src);
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if( update_stats(src.count, src.sampling_rate) ) {
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callback(statistics);
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}
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}
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template<typename Callback>
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void mute(const size_t sample_count, const size_t sampling_rate, Callback callback) {
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if( update_stats(sample_count, sampling_rate) ) {
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callback(statistics);
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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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uint64_t squared_sum { 0 };
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uint32_t max_squared { 0 };
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size_t count { 0 };
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AudioStatistics statistics;
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void consume_audio_buffer(const buffer_s16_t& src) {
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auto src_p = src.p;
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const auto src_end = &src.p[src.count];
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while(src_p < src_end) {
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const auto sample = *(src_p++);
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const uint64_t sample_squared = sample * sample;
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squared_sum += sample_squared;
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if( sample_squared > max_squared ) {
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max_squared = sample_squared;
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}
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}
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}
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bool update_stats(const size_t sample_count, const size_t sampling_rate) {
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count += sample_count;
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const size_t samples_per_update = sampling_rate * update_interval;
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if( count >= samples_per_update ) {
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const float squared_sum_f = squared_sum;
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const float max_squared_f = max_squared;
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const float squared_avg_f = squared_sum_f / count;
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statistics.rms_db = complex16_mag_squared_to_dbv_norm(squared_avg_f);
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statistics.max_db = complex16_mag_squared_to_dbv_norm(max_squared_f);
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statistics.count = count;
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squared_sum = 0;
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max_squared = 0;
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count = 0;
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return true;
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} else {
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return false;
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}
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}
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};
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#endif/*__AUDIO_STATS_COLLECTOR_H__*/
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