Analog tv app (#334)

* Analog TV app (PAL)

* Icon on main menu

* Analog TV should be yellow

Works for PAL only know, it would be nice to add NTSC in the future, or some customizable sync

firmware/application/ui/ui_tv.cpp

@@ -0,0 +1,251 @@
+/*
+ * 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 *******************************************************/
+
+TVWidget::TVWidget(const bool cursor) {
+	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 */