mirror of
https://github.com/eried/portapack-mayhem.git
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291de8f869
Move FFT bit-reversal to complex<int16_t> -> complex<float> copy. Change window so that adjacent bins have constant(-ish) gain. Change window to float. Change time domain samples to accumulate at even intervals over the FFT interval.
123 lines
3.9 KiB
C++
123 lines
3.9 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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#include "baseband_processor.hpp"
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#include "portapack_shared_memory.hpp"
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#include "dsp_fft.hpp"
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#include "audio_dma.hpp"
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#include "message.hpp"
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#include "event_m4.hpp"
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#include "utility.hpp"
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#include <cstddef>
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#include <algorithm>
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void BasebandProcessor::update_spectrum() {
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// Called from idle thread (after EVT_MASK_SPECTRUM is flagged)
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if( channel_spectrum_request_update ) {
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/* Decimated buffer is full. Compute spectrum. */
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channel_spectrum_request_update = false;
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fft_c_preswapped(channel_spectrum);
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ChannelSpectrumMessage spectrum_message;
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for(size_t i=0; i<spectrum_message.spectrum.db.size(); i++) {
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const auto mag2 = magnitude_squared(channel_spectrum[i]);
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const float db = complex16_mag_squared_to_dbv_norm(mag2);
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constexpr float mag_scale = 5.0f;
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const unsigned int v = (db * mag_scale) + 255.0f;
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spectrum_message.spectrum.db[i] = std::max(0U, std::min(255U, v));
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}
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/* TODO: Rename .db -> .magnitude, or something more (less!) accurate. */
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spectrum_message.spectrum.db_count = spectrum_message.spectrum.db.size();
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spectrum_message.spectrum.sampling_rate = channel_spectrum_sampling_rate;
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spectrum_message.spectrum.channel_filter_pass_frequency = channel_filter_pass_frequency;
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spectrum_message.spectrum.channel_filter_stop_frequency = channel_filter_stop_frequency;
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shared_memory.application_queue.push(spectrum_message);
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}
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}
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void BasebandProcessor::feed_channel_stats(const buffer_c16_t channel) {
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channel_stats.feed(
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channel,
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[this](const ChannelStatistics statistics) {
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this->post_channel_stats_message(statistics);
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}
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);
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}
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void BasebandProcessor::feed_channel_spectrum(
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const buffer_c16_t channel,
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const uint32_t filter_pass_frequency,
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const uint32_t filter_stop_frequency
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) {
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channel_filter_pass_frequency = filter_pass_frequency;
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channel_filter_stop_frequency = filter_stop_frequency;
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channel_spectrum_decimator.feed(
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channel,
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[this](const buffer_c16_t data) {
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this->post_channel_spectrum_message(data);
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}
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);
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}
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void BasebandProcessor::fill_audio_buffer(const buffer_s16_t audio) {
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auto audio_buffer = audio::dma::tx_empty_buffer();;
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for(size_t i=0; i<audio_buffer.count; i++) {
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audio_buffer.p[i].left = audio_buffer.p[i].right = audio.p[i];
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}
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i2s::i2s0::tx_unmute();
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feed_audio_stats(audio);
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}
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void BasebandProcessor::post_channel_stats_message(const ChannelStatistics statistics) {
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channel_stats_message.statistics = statistics;
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shared_memory.application_queue.push(channel_stats_message);
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}
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void BasebandProcessor::post_channel_spectrum_message(const buffer_c16_t data) {
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if( !channel_spectrum_request_update ) {
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fft_swap(data, channel_spectrum);
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channel_spectrum_sampling_rate = data.sampling_rate;
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channel_spectrum_request_update = true;
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events_flag(EVT_MASK_SPECTRUM);
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}
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}
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void BasebandProcessor::feed_audio_stats(const buffer_s16_t audio) {
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audio_stats.feed(
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audio,
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[this](const AudioStatistics statistics) {
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this->post_audio_stats_message(statistics);
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}
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);
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}
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void BasebandProcessor::post_audio_stats_message(const AudioStatistics statistics) {
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audio_stats_message.statistics = statistics;
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shared_memory.application_queue.push(audio_stats_message);
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}
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