portapack-mayhem/firmware/baseband/proc_am_audio.cpp
2021-01-27 15:52:17 +01:00

119 lines
4.0 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_am_audio.hpp"
#include "audio_output.hpp"
#include "event_m4.hpp"
#include <array>
void NarrowbandAMAudio::execute(const buffer_c8_t& buffer) {
if( !configured ) {
return;
}
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
channel_spectrum.feed(decim_1_out, channel_filter_low_f, channel_filter_high_f, channel_filter_transition);
const auto decim_2_out = decim_2.execute(decim_1_out, dst_buffer);
const auto channel_out = channel_filter.execute(decim_2_out, dst_buffer);
// TODO: Feed channel_stats post-decimation data?
feed_channel_stats(channel_out);
auto audio = demodulate(channel_out);
audio_compressor.execute_in_place(audio);
audio_output.write(audio);
}
buffer_f32_t NarrowbandAMAudio::demodulate(const buffer_c16_t& channel) {
if( modulation_ssb ) {
return demod_ssb.execute(channel, audio_buffer);
} else {
return demod_am.execute(channel, audio_buffer);
}
}
void NarrowbandAMAudio::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::AMConfigure:
configure(*reinterpret_cast<const AMConfigureMessage*>(message));
break;
case Message::ID::CaptureConfig:
capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
break;
default:
break;
}
}
void NarrowbandAMAudio::configure(const AMConfigureMessage& message) {
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
constexpr size_t decim_2_input_fs = decim_1_output_fs;
constexpr size_t decim_2_output_fs = decim_2_input_fs / decim_2_decimation_factor;
constexpr size_t channel_filter_input_fs = decim_2_output_fs;
//const size_t channel_filter_output_fs = channel_filter_input_fs / channel_filter_decimation_factor;
decim_0.configure(message.decim_0_filter.taps, 33554432);
decim_1.configure(message.decim_1_filter.taps, 131072);
decim_2.configure(message.decim_2_filter.taps, decim_2_decimation_factor);
channel_filter.configure(message.channel_filter.taps, channel_filter_decimation_factor);
channel_filter_low_f = message.channel_filter.low_frequency_normalized * channel_filter_input_fs;
channel_filter_high_f = message.channel_filter.high_frequency_normalized * channel_filter_input_fs;
channel_filter_transition = message.channel_filter.transition_normalized * channel_filter_input_fs;
channel_spectrum.set_decimation_factor(1.0f);
modulation_ssb = (message.modulation == AMConfigureMessage::Modulation::SSB);
audio_output.configure(message.audio_hpf_config);
configured = true;
}
void NarrowbandAMAudio::capture_config(const CaptureConfigMessage& message) {
if( message.config ) {
audio_output.set_stream(std::make_unique<StreamInput>(message.config));
} else {
audio_output.set_stream(nullptr);
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<NarrowbandAMAudio>() };
event_dispatcher.run();
return 0;
}