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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2020 Shao
*
* 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_tv.hpp"
#include "spectrum_color_lut.hpp"
#include "portapack.hpp"
using namespace portapack;
#include "baseband_api.hpp"
#include "string_format.hpp"
#include <cmath>
#include <array>
namespace ui {
namespace tv {
/* TimeScopeView******************************************************/
TimeScopeView::TimeScopeView(
const Rect parent_rect)
: View{parent_rect} {
set_focusable(true);
add_children({//&labels,
//&field_frequency,
&waveform});
/*field_frequency.on_change = [this](int32_t) {
set_dirty();
};
field_frequency.set_value(10);*/
}
void TimeScopeView::paint(Painter& painter) {
const auto r = screen_rect();
painter.fill_rectangle(r, Color::black());
// Cursor
/*
const Rect r_cursor {
field_frequency.value() / (48000 / 240), r.bottom() - 32 - cursor_band_height,
1, cursor_band_height
};
painter.fill_rectangle(
r_cursor,
Color::red()
);*/
}
void TimeScopeView::on_audio_spectrum(const AudioSpectrum* spectrum) {
for (size_t i = 0; i < spectrum->db.size(); i++)
audio_spectrum[i] = ((int16_t)spectrum->db[i] - 127) * 256;
waveform.set_dirty();
}
/* TVView *********************************************************/
void TVView::on_show() {
clear();
const auto screen_r = screen_rect();
display.scroll_set_area(screen_r.top(), screen_r.bottom());
}
void TVView::on_hide() {
/* TODO: Clear region to eliminate brief flash of content at un-shifted
* position?
*/
display.scroll_disable();
}
void TVView::paint(Painter& painter) {
// Do nothing.
(void)painter;
}
void TVView::on_adjust_xcorr(uint8_t xcorr) {
x_correction = xcorr;
}
void TVView::on_channel_spectrum(
const ChannelSpectrum& spectrum) {
// portapack has limitations
// 1.screen resolution (less than 240x320) 2.samples each call back (128 or 256)
// 3.memory size (for ui::Color, the buffer size
// spectrum.db[i] is 256 long
// 768x625 ->128x625 ->128x312 -> 128x104
// originally @6MHz sample rate, the PAL should be 768x625
// I reduced sample rate to 2MHz(3 times less samples), then calculate mag (effectively decimate by 2)
// the resolution is now changed to 128x625. The total decimation factor is 6, which changes how many samples in a line
// However 625 is too large for the screen, also interlaced scanning is harder to realize in portapack than normal computer.
// So I decided to simply drop half of the lines, once y is larger than 625/2=312.5 or 312, I recognize it as a new frame.
// then the resolution is changed to 128x312
// 128x312 is now able to put into a 240x320 screen, but the buffer for a whole frame is 128x312=39936, which is too large
// according to my test, I can only make a buffer with a length of 13312 of type ui::Color. which is 1/3 of what I wanted.
// So now the resolution is changed to 128x104, the height is shrinked to 1/3 of the original height.
// I was expecting to see 1/3 height of original video.
// Look how nice is that! I am now able to meet the requirements of 1 and 3 for portapack. Also the length of a line is 128
// Each call back gives me 256 samples which is exactly 2 lines. What a coincidence!
// After some experiment, I did some improvements.
// 1.I found that instead of 1/3 of the frame is shown, I got 3 whole frames shrinked into one window.
// So I made the height twice simply by painting 2 identical lines in the place of original lines
// 2.I found sometimes there is an horizontal offset, so I added x_correction to move the frame back to center manually
// 3.I changed video_buffer's type, from ui::Color to uint_8, since I don't need 3 digit to represent a grey scale value.
// I was hoping that by doing this, I can have a longer buffer like 39936, then the frame will looks better vertically
// however this is useless until now.
for (size_t i = 0; i < 256; i++) {
// video_buffer[i+count*256] = spectrum_rgb4_lut[spectrum.db[i]];
video_buffer_int[i + count * 256] = 255 - spectrum.db[i];
}
count = count + 1;
if (count == 52 - 1) {
ui::Color line_buffer[128];
Coord line;
uint32_t bmp_px;
/*for (line = 0; line < 104; line++)
{
for (bmp_px = 0; bmp_px < 128; bmp_px++)
{
//line_buffer[bmp_px] = video_buffer[bmp_px+line*128];
line_buffer[bmp_px] = spectrum_rgb4_lut[video_buffer_int[bmp_px+line*128 + x_correction]];
}
display.render_line({ 0, line + 100 }, 128, line_buffer);
}*/
for (line = 0; line < 208; line = line + 2) {
for (bmp_px = 0; bmp_px < 128; bmp_px++) {
// line_buffer[bmp_px] = video_buffer[bmp_px+line*128];
line_buffer[bmp_px] = spectrum_rgb4_lut[video_buffer_int[bmp_px + line / 2 * 128 + x_correction]];
}
display.render_line({0, line + 100}, 128, line_buffer);
display.render_line({0, line + 101}, 128, line_buffer);
}
count = 0;
}
}
void TVView::clear() {
display.fill_rectangle(
screen_rect(),
Color::black());
}
/* TVWidget *******************************************************/
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TVWidget::TVWidget() {
add_children({&tv_view,
&field_xcorr});
field_xcorr.set_value(10);
}
void TVWidget::on_show() {
baseband::spectrum_streaming_start();
}
void TVWidget::on_hide() {
baseband::spectrum_streaming_stop();
}
void TVWidget::show_audio_spectrum_view(const bool show) {
if ((audio_spectrum_view && show) || (!audio_spectrum_view && !show)) return;
if (show) {
audio_spectrum_view = std::make_unique<TimeScopeView>(audio_spectrum_view_rect);
add_child(audio_spectrum_view.get());
update_widgets_rect();
} else {
audio_spectrum_update = false;
remove_child(audio_spectrum_view.get());
audio_spectrum_view.reset();
update_widgets_rect();
}
}
void TVWidget::update_widgets_rect() {
if (audio_spectrum_view) {
tv_view.set_parent_rect(tv_reduced_rect);
} else {
tv_view.set_parent_rect(tv_normal_rect);
}
tv_view.on_show();
}
void TVWidget::set_parent_rect(const Rect new_parent_rect) {
View::set_parent_rect(new_parent_rect);
tv_normal_rect = {0, scale_height, new_parent_rect.width(), new_parent_rect.height() - scale_height};
tv_reduced_rect = {0, audio_spectrum_height + scale_height, new_parent_rect.width(), new_parent_rect.height() - scale_height - audio_spectrum_height};
update_widgets_rect();
}
void TVWidget::paint(Painter& painter) {
// TODO:
(void)painter;
}
void TVWidget::on_channel_spectrum(const ChannelSpectrum& spectrum) {
tv_view.on_channel_spectrum(spectrum);
tv_view.on_adjust_xcorr(field_xcorr.value());
sampling_rate = spectrum.sampling_rate;
}
void TVWidget::on_audio_spectrum() {
audio_spectrum_view->on_audio_spectrum(audio_spectrum_data);
}
} /* namespace tv */
} /* namespace ui */