mayhem-firmware/firmware/baseband/audio_output.cpp
2016-02-14 12:38:50 -08:00

109 lines
2.7 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 "audio_output.hpp"
#include "portapack_shared_memory.hpp"
#include "audio_dma.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
void AudioOutput::configure(
const iir_biquad_config_t& hpf_config,
const iir_biquad_config_t& deemph_config,
const float squelch_threshold
) {
hpf.configure(hpf_config);
deemph.configure(deemph_config);
squelch.set_threshold(squelch_threshold);
}
void AudioOutput::write(
const buffer_s16_t& audio
) {
std::array<float, 32> audio_f;
for(size_t i=0; i<audio.count; i++) {
audio_f[i] = audio.p[i] * ki;
}
write(buffer_f32_t {
audio_f.data(),
audio.count,
audio.sampling_rate
});
}
void AudioOutput::write(
const buffer_f32_t& audio
) {
block_buffer.feed(
audio,
[this](const buffer_f32_t& buffer) {
this->on_block(buffer);
}
);
}
void AudioOutput::on_block(
const buffer_f32_t& audio
) {
const auto audio_present_now = squelch.execute(audio);
hpf.execute_in_place(audio);
deemph.execute_in_place(audio);
audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
const bool audio_present = (audio_present_history != 0);
if( !audio_present ) {
for(size_t i=0; i<audio.count; i++) {
audio.p[i] = 0;
}
}
fill_audio_buffer(audio);
}
void AudioOutput::fill_audio_buffer(const buffer_f32_t& audio) {
auto audio_buffer = audio::dma::tx_empty_buffer();
for(size_t i=0; i<audio_buffer.count; i++) {
const int32_t sample_int = audio.p[i] * k;
const int32_t sample_saturated = __SSAT(sample_int, 16);
audio_buffer.p[i].left = audio_buffer.p[i].right = sample_saturated;
}
feed_audio_stats(audio);
}
void AudioOutput::feed_audio_stats(const buffer_f32_t& audio) {
audio_stats.feed(
audio,
[](const AudioStatistics& statistics) {
const AudioStatisticsMessage audio_stats_message { statistics };
shared_memory.application_queue.push(audio_stats_message);
}
);
}