portapack-mayhem/firmware/baseband/proc_audiotx.cpp

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* 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_audiotx.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void AudioTXProcessor::execute(const buffer_c8_t& buffer) {
if (!configured) return;
// Zero-order hold (poop)
for (size_t i = 0; i < buffer.count; i++) {
resample_acc += resample_inc;
if (resample_acc >= 0x10000) {
resample_acc -= 0x10000;
if (stream) {
stream->read(&audio_sample, 1);
bytes_read++;
}
}
sample = tone_gen.process(audio_sample - 0x80);
// FM
delta = sample * fm_delta;
phase += delta;
sphase = phase + (64 << 24);
re = sine_table_i8[(sphase & 0xFF000000U) >> 24];
im = sine_table_i8[(phase & 0xFF000000U) >> 24];
buffer.p[i] = {(int8_t)re, (int8_t)im};
}
progress_samples += buffer.count;
if (progress_samples >= progress_interval_samples) {
progress_samples -= progress_interval_samples;
txprogress_message.progress = bytes_read; // Inform UI about progress
txprogress_message.done = false;
shared_memory.application_queue.push(txprogress_message);
}
}
void AudioTXProcessor::on_message(const Message* const message) {
switch (message->id) {
case Message::ID::AudioTXConfig:
audio_config(*reinterpret_cast<const AudioTXConfigMessage*>(message));
break;
case Message::ID::ReplayConfig:
configured = false;
bytes_read = 0;
replay_config(*reinterpret_cast<const ReplayConfigMessage*>(message));
break;
case Message::ID::SampleRateConfig:
sample_rate_config(*reinterpret_cast<const SampleRateConfigMessage*>(message));
break;
case Message::ID::FIFOData:
configured = true;
break;
default:
break;
}
}
void AudioTXProcessor::audio_config(const AudioTXConfigMessage& message) {
fm_delta = message.deviation_hz * (0xFFFFFFULL / baseband_fs);
tone_gen.configure(message.tone_key_delta, message.tone_key_mix_weight);
progress_interval_samples = message.divider;
resample_acc = 0;
}
void AudioTXProcessor::replay_config(const ReplayConfigMessage& message) {
if (message.config) {
stream = std::make_unique<StreamOutput>(message.config);
// Tell application that the buffers and FIFO pointers are ready, prefill
shared_memory.application_queue.push(sig_message);
} else {
stream.reset();
}
}
void AudioTXProcessor::sample_rate_config(const SampleRateConfigMessage& message) {
resample_inc = (((uint64_t)message.sample_rate) << 16) / baseband_fs; // 16.16 fixed point message.sample_rate
}
int main() {
EventDispatcher event_dispatcher{std::make_unique<AudioTXProcessor>()};
event_dispatcher.run();
return 0;
}