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SoundPlayer: Start working on a GUI sound player application

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This can play anything that AWavLoader can load (so obviously only WAV
files at the moment.)

It works by having a timer that wakes up every 100ms and tries to send
a sample buffer to the AudioServer. If our server-side queue is full
then we wait until the next timer iteration and try again.

We display the most recently enqueued sample buffer in a nice little
widget that just plots the samples in green-on-black. :^)
This commit is contained in:
Andreas Kling 2019-09-04 20:18:41 +02:00
parent 6693e56603
commit 1188a036e9
6 changed files with 148 additions and 0 deletions
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72
Applications/SoundPlayer/main.cpp Normal file
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#include "SampleWidget.h"
#include <LibAudio/ABuffer.h>
#include <LibAudio/AClientConnection.h>
#include <LibAudio/AWavLoader.h>
#include <LibCore/CTimer.h>
#include <LibGUI/GApplication.h>
#include <LibGUI/GBoxLayout.h>
#include <LibGUI/GButton.h>
#include <LibGUI/GWidget.h>
#include <LibGUI/GWindow.h>
#include <stdio.h>
int main(int argc, char** argv)
{
if (argc != 2) {
printf("usage: %s <wav-file>\n", argv[0]);
return 0;
}
GApplication app(argc, argv);
String path = argv[1];
AWavLoader loader(path);
if (loader.has_error()) {
fprintf(stderr, "Failed to load WAV file: %s (%s)\n", path.characters(), loader.error_string());
return 1;
}
AClientConnection audio_client;
audio_client.handshake();
auto* window = new GWindow;
window->set_title("SoundPlayer");
window->set_rect(300, 300, 300, 200);
auto* widget = new GWidget;
window->set_main_widget(widget);
widget->set_fill_with_background_color(true);
widget->set_layout(make<GBoxLayout>(Orientation::Vertical));
widget->layout()->set_margins({ 2, 2, 2, 2 });
auto* sample_widget = new SampleWidget(widget);
auto* button = new GButton("Quit", widget);
button->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
button->set_preferred_size(0, 20);
button->on_click = [&](auto&) {
app.quit();
};
auto next_sample_buffer = loader.get_more_samples();
new CTimer(100, [&] {
if (!next_sample_buffer) {
sample_widget->set_buffer(nullptr);
return;
}
bool enqueued = audio_client.try_enqueue(*next_sample_buffer);
if (!enqueued)
return;
sample_widget->set_buffer(next_sample_buffer);
next_sample_buffer = loader.get_more_samples(16 * KB);
if (!next_sample_buffer) {
dbg() << "Exhausted samples :^)";
}
});
window->show();
return app.exec();
}