mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-27 00:09:36 -05:00
115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "audio_output.hpp"
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#include "portapack_shared_memory.hpp"
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#include "audio_dma.hpp"
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#include "message.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <array>
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void AudioOutput::configure(
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const iir_biquad_config_t& hpf_config,
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const iir_biquad_config_t& deemph_config,
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const float squelch_threshold
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) {
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hpf.configure(hpf_config);
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deemph.configure(deemph_config);
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squelch.set_threshold(squelch_threshold);
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}
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void AudioOutput::write(
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const buffer_s16_t& audio
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) {
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std::array<float, 32> audio_f;
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for(size_t i=0; i<audio.count; i++) {
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audio_f[i] = audio.p[i] * ki;
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}
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write(buffer_f32_t {
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audio_f.data(),
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audio.count,
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audio.sampling_rate
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});
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}
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void AudioOutput::write(
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const buffer_f32_t& audio
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) {
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block_buffer.feed(
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audio,
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[this](const buffer_f32_t& buffer) {
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this->on_block(buffer);
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}
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);
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}
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void AudioOutput::on_block(
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const buffer_f32_t& audio
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) {
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const auto audio_present_now = squelch.execute(audio);
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hpf.execute_in_place(audio);
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deemph.execute_in_place(audio);
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audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
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const bool audio_present = (audio_present_history != 0);
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if( !audio_present ) {
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for(size_t i=0; i<audio.count; i++) {
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audio.p[i] = 0;
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}
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}
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fill_audio_buffer(audio, audio_present);
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}
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void AudioOutput::fill_audio_buffer(const buffer_f32_t& audio, const bool send_to_fifo) {
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std::array<int16_t, 32> audio_int;
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auto audio_buffer = audio::dma::tx_empty_buffer();
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for(size_t i=0; i<audio_buffer.count; i++) {
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const int32_t sample_int = audio.p[i] * k;
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const int32_t sample_saturated = __SSAT(sample_int, 16);
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audio_buffer.p[i].left = audio_buffer.p[i].right = sample_saturated;
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audio_int[i] = sample_saturated;
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}
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if( stream && send_to_fifo ) {
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stream->write(audio_int.data(), audio_buffer.count * sizeof(audio_int[0]));
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}
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feed_audio_stats(audio);
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}
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void AudioOutput::feed_audio_stats(const buffer_f32_t& audio) {
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audio_stats.feed(
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audio,
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[](const AudioStatistics& statistics) {
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const AudioStatisticsMessage audio_stats_message { statistics };
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shared_memory.application_queue.push(audio_stats_message);
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}
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);
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}
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