mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-25 15:29:37 -05:00
88 lines
3.1 KiB
C++
88 lines
3.1 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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#include "proc_nfm_audio.hpp"
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#include "audio_output.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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channel_block_buffer.feed(
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channel_out, [this](const buffer_c16_t buffer) {
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auto audio = this->demod.execute(buffer, this->audio_buffer);
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this->audio_output.write(audio);
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}
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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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case Message::ID::SpectrumStreamingConfig:
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channel_spectrum.on_message(message);
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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 decim_0_input_fs = baseband_fs;
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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_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_output_fs = channel_filter_input_fs / channel_filter_decimation_factor;
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constexpr size_t demod_input_fs = channel_filter_output_fs / post_channel_decimation_factor;
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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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audio_output.configure(message.audio_hpf_config, message.audio_deemph_config, 0);
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configured = true;
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}
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