portapack-mayhem/firmware/application/ui_view_wav.cpp

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2017 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 "ui_view_wav.hpp"
#include "ui_fileman.hpp"
using namespace portapack;
#include "string_format.hpp"
namespace ui {
void ViewWavView::update_scale(int32_t new_scale) {
scale = new_scale;
ns_per_pixel = (1000000000UL / wav_reader->sample_rate()) * scale;
refresh_waveform();
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refresh_measurements();
}
void ViewWavView::refresh_waveform() {
for (size_t i = 0; i < 240; i++) {
wav_reader->data_seek(position + (i * scale));
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wav_reader->read(&waveform_buffer[i], sizeof(int16_t));
}
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waveform.set_dirty();
// Window
uint64_t w_start = (position * 240) / wav_reader->sample_count();
uint64_t w_width = (scale * 240) / (wav_reader->sample_count() / 240);
display.fill_rectangle({ 0, 10 * 16 + 1, 240, 16 }, Color::black());
display.fill_rectangle({ (Coord)w_start, 21 * 8, (Dim)w_width + 1, 8 }, Color::white());
display.draw_line({ 0, 10 * 16 + 1 }, { (Coord)w_start, 21 * 8 }, Color::white());
display.draw_line({ 239, 10 * 16 + 1 }, { (Coord)(w_start + w_width), 21 * 8 }, Color::white());
}
void ViewWavView::refresh_measurements() {
uint64_t span_ns = ns_per_pixel * abs(field_cursor_b.value() - field_cursor_a.value());
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if (span_ns)
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text_delta.set(unit_auto_scale(span_ns, 0, 3) + "s (" + to_string_dec_uint(1000000000UL / span_ns) + "Hz)");
else
text_delta.set("0us ?Hz");
}
void ViewWavView::paint(Painter& painter) {
// Waveform limits
painter.draw_hline({ 0, 6 * 16 - 1 }, 240, Color::grey());
painter.draw_hline({ 0, 10 * 16 }, 240, Color::grey());
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// Overall amplitude view, 0~127 to 0~255 color index
for (size_t i = 0; i < 240; i++)
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painter.draw_vline({ (Coord)i, 11 * 16 }, 8, spectrum_rgb2_lut[amplitude_buffer[i] << 1]);
}
void ViewWavView::on_pos_changed() {
position = (field_pos_seconds.value() * wav_reader->sample_rate()) + field_pos_samples.value();
refresh_waveform();
}
void ViewWavView::load_wav(std::filesystem::path file_path) {
int16_t sample;
uint32_t average;
if (!wav_reader->open(file_path)) {
nav_.display_modal("Error", "Couldn't open file.", INFO, nullptr);
return;
}
if ((wav_reader->channels() != 1) || (wav_reader->bits_per_sample() != 16)) {
nav_.display_modal("Error", "Wrong format.\nWav viewer only accepts\n16-bit mono files.", INFO, nullptr);
return;
}
text_filename.set(file_path.filename().string());
auto ms_duration = wav_reader->ms_duration();
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text_duration.set(unit_auto_scale(ms_duration, 2, 3) + "s");
wav_reader->rewind();
text_samplerate.set(to_string_dec_uint(wav_reader->sample_rate()) + "Hz");
text_title.set(wav_reader->title());
// Fill amplitude buffer, world's worst downsampling
uint64_t skip = wav_reader->sample_count() / (240 * subsampling_factor);
for (size_t i = 0; i < 240; i++) {
average = 0;
for (size_t s = 0; s < subsampling_factor; s++) {
wav_reader->data_seek(((i * subsampling_factor) + s) * skip);
wav_reader->read(&sample, 2);
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average += (abs(sample) >> 8);
}
amplitude_buffer[i] = average / subsampling_factor;
}
reset_controls();
update_scale(1);
}
void ViewWavView::reset_controls() {
field_scale.set_value(1);
field_pos_seconds.set_value(0);
field_pos_samples.set_value(0);
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field_cursor_a.set_value(0);
field_cursor_b.set_value(0);
}
ViewWavView::ViewWavView(
NavigationView& nav
) : nav_(nav)
{
wav_reader = std::make_unique<WAVFileReader>();
add_children({
&labels,
&text_filename,
&text_samplerate,
&text_title,
&text_duration,
&button_open,
&waveform,
&field_pos_seconds,
&field_pos_samples,
&field_scale,
&field_cursor_a,
&field_cursor_b,
&text_delta
});
button_open.on_select = [this, &nav](Button&) {
auto open_view = nav.push<FileLoadView>(".WAV");
open_view->on_changed = [this](std::filesystem::path file_path) {
load_wav(file_path);
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field_pos_seconds.focus();
};
};
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field_scale.on_change = [this](int32_t value) {
update_scale(value);
};
field_pos_seconds.on_change = [this](int32_t) {
on_pos_changed();
};
field_pos_samples.on_change = [this](int32_t) {
on_pos_changed();
};
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field_cursor_a.on_change = [this](int32_t v) {
waveform.set_cursor(0, v);
refresh_measurements();
};
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field_cursor_b.on_change = [this](int32_t v) {
waveform.set_cursor(1, v);
refresh_measurements();
};
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reset_controls();
}
void ViewWavView::focus() {
button_open.focus();
}
} /* namespace ui */