portapack-mayhem/firmware/baseband/tv_collector.cpp

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2020 Shao
*
* 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 "tv_collector.hpp"
#include "dsp_fft.hpp"
#include "utility.hpp"
#include "event_m4.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
#include <algorithm>
void TvCollector::on_message(const Message* const message) {
switch (message->id) {
case Message::ID::UpdateSpectrum:
update();
break;
case Message::ID::SpectrumStreamingConfig:
set_state(*reinterpret_cast<const SpectrumStreamingConfigMessage*>(message));
break;
default:
break;
}
}
void TvCollector::set_state(const SpectrumStreamingConfigMessage& message) {
if (message.mode == SpectrumStreamingConfigMessage::Mode::Running) {
start();
} else {
stop();
}
}
void TvCollector::start() {
streaming = true;
ChannelSpectrumConfigMessage message{&fifo};
shared_memory.application_queue.push(message);
}
void TvCollector::stop() {
streaming = false;
fifo.reset_in();
}
void TvCollector::set_decimation_factor(
const size_t decimation_factor) {
channel_spectrum_decimator.set_factor(decimation_factor);
}
/* TODO: Refactor to register task with idle thread?
* It's sad that the idle thread has to call all the way back here just to
* perform the deferred task on the buffer of data we prepared.
*/
void TvCollector::feed(
const buffer_c16_t& channel) {
// Called from baseband processing thread.
channel_spectrum_decimator.feed(channel, [this](const buffer_c16_t& data) { this->post_message(data); });
}
void TvCollector::post_message(const buffer_c16_t& data) {
// Called from baseband processing thread.
float re, im;
float mag;
if (streaming && !channel_spectrum_request_update) {
for (size_t i = 0; i < 256; i++) {
re = (float)(data.p[i].real());
im = (float)(data.p[i].imag());
mag = __builtin_sqrtf((re * re) + (im * im));
channel_spectrum[i] = {mag, mag};
}
channel_spectrum_sampling_rate = data.sampling_rate;
channel_spectrum_request_update = true;
EventDispatcher::events_flag(EVT_MASK_SPECTRUM);
}
}
void TvCollector::update() {
// Called from idle thread (after EVT_MASK_SPECTRUM is flagged)
if (streaming && channel_spectrum_request_update) {
ChannelSpectrum spectrum;
spectrum.sampling_rate = channel_spectrum_sampling_rate;
for (size_t i = 0; i < spectrum.db.size(); i++) {
const auto corrected_sample = channel_spectrum[i].real();
const unsigned int v = corrected_sample + 127.0f;
spectrum.db[i] = std::max(0U, std::min(255U, v));
}
fifo.in(spectrum);
}
channel_spectrum_request_update = false;
}