mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-09-20 16:15:51 +00:00
102 lines
3.6 KiB
C++
102 lines
3.6 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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#include "proc_nfm_audio.hpp"
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#include <cstdint>
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#include <cstddef>
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void NarrowbandFMAudio::execute(const buffer_c8_t& buffer) {
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if( !configured ) {
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return;
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}
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const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
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const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
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const auto channel_out = channel_filter.execute(decim_1_out, dst_buffer);
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feed_channel_stats(channel_out);
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channel_spectrum.feed(channel_out, channel_filter_pass_f, channel_filter_stop_f);
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auto audio = demod.execute(channel_out, work_audio_buffer);
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// Yes, evaluate squelch here, but do audio filtering regardless to keep glitches
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// out of the filters. Zero out audio *after* filtering, based on squelch status.
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const auto audio_present_now = squelch.execute(audio);
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audio_hpf.execute_in_place(audio);
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audio_deemph.execute_in_place(audio);
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static uint64_t audio_present_history = 0;
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audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
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const bool audio_present = (audio_present_history != 0);
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if( audio_present ) {
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fill_audio_buffer(audio);
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} else {
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mute_audio();
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}
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}
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void NarrowbandFMAudio::on_message(const Message* const message) {
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switch(message->id) {
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case Message::ID::UpdateSpectrum:
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channel_spectrum.update();
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break;
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case Message::ID::NBFMConfigure:
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configure(*reinterpret_cast<const NBFMConfigureMessage*>(message));
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break;
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default:
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break;
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}
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}
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void NarrowbandFMAudio::configure(const NBFMConfigureMessage& message) {
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constexpr size_t baseband_fs = 3072000;
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constexpr size_t decim_0_input_fs = baseband_fs;
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constexpr size_t decim_0_decimation_factor = 8;
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constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0_decimation_factor;
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constexpr size_t decim_1_input_fs = decim_0_output_fs;
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constexpr size_t decim_1_decimation_factor = 8;
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constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1_decimation_factor;
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constexpr size_t channel_filter_input_fs = decim_1_output_fs;
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constexpr size_t channel_filter_decimation_factor = 1;
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constexpr size_t channel_filter_output_fs = channel_filter_input_fs / channel_filter_decimation_factor;
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constexpr size_t demod_input_fs = channel_filter_output_fs;
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decim_0.configure(message.decim_0_filter.taps, 33554432);
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decim_1.configure(message.decim_1_filter.taps, 131072);
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channel_filter.configure(message.channel_filter.taps, channel_filter_decimation_factor);
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demod.configure(demod_input_fs, message.deviation);
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channel_filter_pass_f = message.channel_filter.pass_frequency_normalized * channel_filter_input_fs;
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channel_filter_stop_f = message.channel_filter.stop_frequency_normalized * channel_filter_input_fs;
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channel_spectrum.set_decimation_factor(std::floor((channel_filter_output_fs / 2) / ((channel_filter_pass_f + channel_filter_stop_f) / 2)));
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squelch.set_threshold(6144);
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configured = true;
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}
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