mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 19:54:39 +00:00
75 lines
2.3 KiB
C++
75 lines
2.3 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_nfm_audio.hpp"
|
|
|
|
#include <cstdint>
|
|
#include <cstddef>
|
|
|
|
void NarrowbandFMAudio::execute(buffer_c8_t buffer) {
|
|
/* Called every 2048/3072000 second -- 1500Hz. */
|
|
|
|
auto decimator_out = decimator.execute(buffer);
|
|
|
|
const buffer_c16_t work_baseband_buffer {
|
|
(complex16_t*)decimator_out.p,
|
|
sizeof(*decimator_out.p) * decimator_out.count
|
|
};
|
|
|
|
/* 96kHz complex<int16_t>[64]
|
|
* -> FIR filter, <6kHz (0.063fs) pass, gain 1.0
|
|
* -> 48kHz int16_t[32] */
|
|
auto channel = channel_filter.execute(decimator_out, work_baseband_buffer);
|
|
|
|
// TODO: Feed channel_stats post-decimation data?
|
|
feed_channel_stats(channel);
|
|
feed_channel_spectrum(
|
|
channel,
|
|
decimator_out.sampling_rate * channel_filter_taps.pass_frequency_normalized,
|
|
decimator_out.sampling_rate * channel_filter_taps.stop_frequency_normalized
|
|
);
|
|
|
|
const buffer_s16_t work_audio_buffer {
|
|
(int16_t*)decimator_out.p,
|
|
sizeof(*decimator_out.p) * decimator_out.count
|
|
};
|
|
|
|
/* 48kHz complex<int16_t>[32]
|
|
* -> FM demodulation
|
|
* -> 48kHz int16_t[32] */
|
|
auto audio = demod.execute(channel, work_audio_buffer);
|
|
|
|
static uint64_t audio_present_history = 0;
|
|
const auto audio_present_now = squelch.execute(audio);
|
|
audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
|
|
const bool audio_present = (audio_present_history != 0);
|
|
|
|
if( !audio_present ) {
|
|
// Zero audio buffer.
|
|
for(size_t i=0; i<audio.count; i++) {
|
|
audio.p[i] = 0;
|
|
}
|
|
}
|
|
|
|
audio_hpf.execute_in_place(audio);
|
|
fill_audio_buffer(audio);
|
|
}
|