portapack-mayhem/firmware/baseband/proc_wfm_audio.hpp
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/*
* Copyright (C) 2014 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.
*/
#ifndef __PROC_WFM_AUDIO_H__
#define __PROC_WFM_AUDIO_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_types.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "block_decimator.hpp"
#include "audio_output.hpp"
#include "spectrum_collector.hpp"
class WidebandFMAudio : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 3072000;
static constexpr auto spectrum_rate_hz = 50.0f;
BasebandThread baseband_thread{baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive};
RSSIThread rssi_thread{NORMALPRIO + 10};
std::array<complex16_t, 512> dst{};
const buffer_c16_t dst_buffer{
dst.data(),
dst.size()};
// work_audio_buffer and dst_buffer use the same data pointer
const buffer_s16_t work_audio_buffer{
(int16_t*)dst.data(),
sizeof(dst) / sizeof(int16_t)};
std::array<complex16_t, 64> complex_audio{};
const buffer_c16_t complex_audio_buffer{
complex_audio.data(),
complex_audio.size()};
dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0{};
dsp::decimate::FIRC16xR16x16Decim2 decim_1{};
int32_t channel_filter_low_f = 0;
int32_t channel_filter_high_f = 0;
int32_t channel_filter_transition = 0;
dsp::demodulate::FM demod{};
dsp::decimate::DecimateBy2CIC4Real audio_dec_1{};
dsp::decimate::DecimateBy2CIC4Real audio_dec_2{};
dsp::decimate::FIR64AndDecimateBy2Real audio_filter{};
AudioOutput audio_output{};
// For fs=96kHz FFT streaming
BlockDecimator<complex16_t, 256> audio_spectrum_decimator{1};
std::array<std::complex<float>, 256> audio_spectrum{};
uint32_t audio_spectrum_timer{0};
enum AudioSpectrumState {
IDLE = 0,
FEED,
FFT
};
AudioSpectrumState audio_spectrum_state{IDLE};
AudioSpectrum spectrum{};
uint32_t fft_step{0};
SpectrumCollector channel_spectrum{};
size_t spectrum_interval_samples = 0;
size_t spectrum_samples = 0;
bool configured{false};
void configure(const WFMConfigureMessage& message);
void capture_config(const CaptureConfigMessage& message);
void post_message(const buffer_c16_t& data);
};
#endif /*__PROC_WFM_AUDIO_H__*/