SoundPlayer: Added playback controls

The playback of a file can now be paused, stopped, continued and the
user can seek to any part of the file.

Applications/SoundPlayer/Makefile

@@ -1,7 +1,9 @@
 include ../../Makefile.common
 
 OBJS = \
+	PlaybackManager.o \
     SampleWidget.o \
+	SoundPlayerWidget.o \
     main.o
 
 APP = SoundPlayer

Applications/SoundPlayer/PlaybackManager.cpp

@@ -0,0 +1,134 @@
+#include "PlaybackManager.h"
+
+PlaybackManager::PlaybackManager(NonnullRefPtr<AClientConnection> connection, AWavLoader& loader)
+    : m_loader(loader)
+    , m_connection(connection)
+{
+    m_total_length = loader.total_samples() / static_cast<float>(loader.sample_rate());
+    m_timer = CTimer::construct(100, [&]() { next_buffer(); });
+    pause();
+}
+
+PlaybackManager::~PlaybackManager()
+{
+}
+
+void PlaybackManager::stop()
+{
+    set_paused(true);
+    m_connection->clear_buffer(true);
+    m_buffers.clear();
+    m_loader.reset();
+    m_last_seek = 0;
+    m_next_buffer = nullptr;
+    m_current_buffer = nullptr;
+    m_next_ptr = 0;
+}
+
+void PlaybackManager::play()
+{
+    set_paused(false);
+}
+
+void PlaybackManager::seek(const int position)
+{
+    m_last_seek = position;
+    bool paused_state = m_paused;
+    set_paused(true);
+
+    m_connection->clear_buffer(true);
+    m_next_buffer = nullptr;
+    m_current_buffer = nullptr;
+    m_next_ptr = 0;
+    m_buffers.clear();
+    m_loader.seek(position);
+
+    if (!paused_state)
+        set_paused(false);
+}
+
+void PlaybackManager::pause()
+{
+    set_paused(true);
+}
+
+void PlaybackManager::remove_dead_buffers()
+{
+    int id = m_connection->get_playing_buffer();
+    int current_id = -1;
+    if (m_current_buffer)
+        current_id = m_current_buffer->shared_buffer_id();
+
+    if (id >= 0 && id != current_id) {
+        while (!m_buffers.is_empty()) {
+            --m_next_ptr;
+            auto buffer = m_buffers.take_first();
+
+            if (buffer->shared_buffer_id() == id) {
+                m_current_buffer = buffer;
+                break;
+            }
+        }
+    }
+}
+
+void PlaybackManager::load_next_buffer()
+{
+    if (m_buffers.size() < 10) {
+        for (int i = 0; i < 20 && m_loader.loaded_samples() < m_loader.total_samples(); i++) {
+            auto buffer = m_loader.get_more_samples(PLAYBACK_MANAGER_BUFFER_SIZE);
+            if (buffer)
+                m_buffers.append(buffer);
+        }
+    }
+
+    if (m_next_ptr < m_buffers.size()) {
+        m_next_buffer = m_buffers.at(m_next_ptr++);
+    } else {
+        m_next_buffer = nullptr;
+    }
+}
+
+void PlaybackManager::set_paused(bool paused)
+{
+    if (!m_next_buffer)
+        load_next_buffer();
+
+    m_paused = paused;
+    m_connection->set_paused(paused);
+}
+
+bool PlaybackManager::toggle_pause()
+{
+    if (m_paused) {
+        play();
+    } else {
+        pause();
+    }
+    return m_paused;
+}
+
+void PlaybackManager::next_buffer()
+{
+    if (on_update)
+        on_update();
+
+    if (m_paused)
+        return;
+
+    remove_dead_buffers();
+    if (!m_next_buffer) {
+        if (!m_connection->get_remaining_samples() && !m_paused) {
+            dbg() << "Exhausted samples :^)";
+            stop();
+        }
+
+        return;
+    }
+
+    bool enqueued = m_connection->try_enqueue(*m_next_buffer);
+    if (!enqueued)
+        return;
+
+    load_next_buffer();
+}

Applications/SoundPlayer/PlaybackManager.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <AK/Vector.h>
+#include <LibAudio/AClientConnection.h>
+#include <LibAudio/AWavLoader.h>
+#include <LibCore/CTimer.h>
+
+#define PLAYBACK_MANAGER_BUFFER_SIZE 64 * KB
+#define PLAYBACK_MANAGER_RATE 44100
+
+class PlaybackManager final {
+public:
+    PlaybackManager(NonnullRefPtr<AClientConnection>, AWavLoader&);
+    ~PlaybackManager();
+
+    void play();
+    void stop();
+    void pause();
+    void seek(const int position);
+    bool toggle_pause();
+
+    int last_seek() const { return m_last_seek; }
+    bool is_paused() const { return m_paused; }
+    float total_length() const { return m_total_length; }
+    RefPtr<ABuffer> current_buffer() const { return m_current_buffer; }
+
+    NonnullRefPtr<AClientConnection> connection() const { return m_connection; }
+    AWavLoader& loader() const { return m_loader; }
+
+    Function<void()> on_update;
+
+private:
+    void next_buffer();
+    void set_paused(bool);
+    void load_next_buffer();
+    void remove_dead_buffers();
+
+    bool m_paused { true };
+    int m_next_ptr { 0 };
+    int m_last_seek { 0 };
+    float m_total_length;
+    AWavLoader& m_loader;
+    NonnullRefPtr<AClientConnection> m_connection;
+    RefPtr<ABuffer> m_next_buffer;
+    RefPtr<ABuffer> m_current_buffer;
+    Vector<RefPtr<ABuffer>> m_buffers;
+    RefPtr<CTimer> m_timer;
+};

Applications/SoundPlayer/SampleWidget.cpp

@@ -23,30 +23,31 @@ void SampleWidget::paint_event(GPaintEvent& event)
     painter.add_clip_rect(event.rect());
     painter.fill_rect(frame_inner_rect(), Color::Black);
 
-    if (!m_buffer)
-        return;
-
-    int samples_per_pixel = m_buffer->sample_count() / frame_inner_rect().width();
     float sample_max = 0;
     int count = 0;
     int x_offset = frame_inner_rect().x();
     int x = x_offset;
     int y_offset = frame_inner_rect().center().y();
 
-    for (int sample_index = 0; sample_index < m_buffer->sample_count() && (x - x_offset) < frame_inner_rect().width(); ++sample_index) {
-        float sample = fabsf(m_buffer->samples()[sample_index].left);
+    if (m_buffer) {
+        int samples_per_pixel = m_buffer->sample_count() / frame_inner_rect().width();
+        for (int sample_index = 0; sample_index < m_buffer->sample_count() && (x - x_offset) < frame_inner_rect().width(); ++sample_index) {
+            float sample = fabsf(m_buffer->samples()[sample_index].left);
 
-        sample_max = max(sample, sample_max);
-        ++count;
+            sample_max = max(sample, sample_max);
+            ++count;
 
-        if (count >= samples_per_pixel) {
-            Point min_point = { x, y_offset + static_cast<int>(-sample_max * frame_inner_rect().height() / 2) };
-            Point max_point = { x++, y_offset + static_cast<int>(sample_max * frame_inner_rect().height() / 2) };
-            painter.draw_line(min_point, max_point, Color::Green);
+            if (count >= samples_per_pixel) {
+                Point min_point = { x, y_offset + static_cast<int>(-sample_max * frame_inner_rect().height() / 2) };
+                Point max_point = { x++, y_offset + static_cast<int>(sample_max * frame_inner_rect().height() / 2) };
+                painter.draw_line(min_point, max_point, Color::Green);
 
-            count = 0;
-            sample_max = 0;
+                count = 0;
+                sample_max = 0;
+            }
         }
+    } else {
+        painter.draw_line({ x, y_offset }, { frame_inner_rect().width(), y_offset }, Color::Green);
     }
 }
 

Applications/SoundPlayer/SoundPlayerWidget.cpp

@@ -0,0 +1,124 @@
+#include "SoundPlayerWidget.h"
+#include <AK/StringBuilder.h>
+#include <LibGUI/GBoxLayout.h>
+#include <LibGUI/GButton.h>
+#include <LibGUI/GLabel.h>
+#include <LibM/math.h>
+
+SoundPlayerWidget::SoundPlayerWidget(NonnullRefPtr<AClientConnection> connection, AWavLoader& loader)
+    : m_manager(PlaybackManager(connection, loader))
+{
+    set_fill_with_background_color(true);
+    set_layout(make<GBoxLayout>(Orientation::Vertical));
+    layout()->set_margins({ 2, 2, 2, 2 });
+
+    m_sample_ratio = PLAYBACK_MANAGER_RATE / static_cast<float>(loader.sample_rate());
+
+    auto status_widget = GWidget::construct(this);
+    status_widget->set_fill_with_background_color(true);
+    status_widget->set_layout(make<GBoxLayout>(Orientation::Horizontal));
+
+    m_elapsed = GLabel::construct(status_widget);
+    m_elapsed->set_frame_shape(FrameShape::Container);
+    m_elapsed->set_frame_shadow(FrameShadow::Sunken);
+    m_elapsed->set_frame_thickness(2);
+    m_elapsed->set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
+    m_elapsed->set_preferred_size(80, 0);
+
+    m_sample_widget = SampleWidget::construct(status_widget);
+
+    m_remaining = GLabel::construct(status_widget);
+    m_remaining->set_frame_shape(FrameShape::Container);
+    m_remaining->set_frame_shadow(FrameShadow::Sunken);
+    m_remaining->set_frame_thickness(2);
+    m_remaining->set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
+    m_remaining->set_preferred_size(80, 0);
+
+    m_slider = Slider::construct(Orientation::Horizontal, this);
+    m_slider->set_min(0);
+    m_slider->set_max(normalize_rate(static_cast<int>(loader.total_samples())));
+    m_slider->on_knob_released = [&](int value) { m_manager.seek(denormalize_rate(value)); };
+
+    auto control_widget = GWidget::construct(this);
+    control_widget->set_fill_with_background_color(true);
+    control_widget->set_layout(make<GBoxLayout>(Orientation::Horizontal));
+    control_widget->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
+    control_widget->set_preferred_size(0, 30);
+    control_widget->layout()->set_margins({ 10, 2, 10, 2 });
+    control_widget->layout()->set_spacing(10);
+
+    m_play = GButton::construct(control_widget);
+    m_play->set_icon(*m_pause_icon);
+    m_play->on_click = [this](GButton& button) {
+        button.set_icon(m_manager.toggle_pause() ? *m_play_icon : *m_pause_icon);
+    };
+
+    auto stop = GButton::construct(control_widget);
+    stop->set_icon(GraphicsBitmap::load_from_file("/res/icons/16x16/stop.png"));
+    stop->on_click = [&](GButton&) { m_manager.stop(); };
+
+    m_status = GLabel::construct(this);
+    m_status->set_frame_shape(FrameShape::Box);
+    m_status->set_frame_shadow(FrameShadow::Raised);
+    m_status->set_frame_thickness(4);
+    m_status->set_text_alignment(TextAlignment::CenterLeft);
+    m_status->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
+    m_status->set_preferred_size(0, 18);
+
+    m_status->set_text(String::format(
+        "Sample rate %uHz, %u channels, %u bits per sample",
+        loader.sample_rate(),
+        loader.num_channels(),
+        loader.bits_per_sample()));
+
+    update_position(0);
+
+    m_manager.on_update = [&]() { update_ui(); };
+    m_manager.play();
+}
+
+SoundPlayerWidget::~SoundPlayerWidget()
+{
+}
+
+SoundPlayerWidget::Slider::~Slider()
+{
+}
+
+int SoundPlayerWidget::normalize_rate(int rate) const
+{
+    return static_cast<int>(rate * m_sample_ratio);
+}
+
+int SoundPlayerWidget::denormalize_rate(int rate) const
+{
+    return static_cast<int>(rate / m_sample_ratio);
+}
+
+void SoundPlayerWidget::update_ui()
+{
+    m_sample_widget->set_buffer(m_manager.current_buffer());
+    m_play->set_icon(m_manager.is_paused() ? *m_play_icon : *m_pause_icon);
+    update_position(m_manager.connection()->get_played_samples());
+}
+
+void SoundPlayerWidget::update_position(const int position)
+{
+    int total_norm_samples = position + normalize_rate(m_manager.last_seek());
+    float seconds = (total_norm_samples / static_cast<float>(PLAYBACK_MANAGER_RATE));
+    float remaining_seconds = m_manager.total_length() - seconds;
+
+    m_elapsed->set_text(String::format(
+        "Position:\n%u:%02u.%02u",
+        static_cast<int>(seconds / 60),
+        static_cast<int>(seconds) % 60,
+        static_cast<int>(seconds * 100) % 100));
+
+    m_remaining->set_text(String::format(
+        "Remaining:\n%u:%02u.%02u",
+        static_cast<int>(remaining_seconds / 60),
+        static_cast<int>(remaining_seconds) % 60,
+        static_cast<int>(remaining_seconds * 100) % 100));
+
+    m_slider->set_value(total_norm_samples);
+}

Applications/SoundPlayer/SoundPlayerWidget.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include "PlaybackManager.h"
+#include "SampleWidget.h"
+#include <LibGUI/GButton.h>
+#include <LibGUI/GLabel.h>
+#include <LibGUI/GSlider.h>
+#include <LibGUI/GWidget.h>
+
+class SoundPlayerWidget final : public GWidget {
+    C_OBJECT(SoundPlayerWidget)
+public:
+    virtual ~SoundPlayerWidget() override;
+
+private:
+    explicit SoundPlayerWidget(NonnullRefPtr<AClientConnection>, AWavLoader&);
+
+    void update_position(const int position);
+    void update_ui();
+    int normalize_rate(int) const;
+    int denormalize_rate(int) const;
+
+    class Slider final : public GSlider {
+        C_OBJECT(Slider)
+    public:
+        virtual ~Slider() override;
+        Function<void(int)> on_knob_released;
+        void set_value(int value)
+        {
+            if (!knob_dragging())
+                GSlider::set_value(value);
+        }
+
+    protected:
+        Slider(Orientation orientation, GWidget* parent)
+            : GSlider(orientation, parent)
+        {
+        }
+
+        virtual void mouseup_event(GMouseEvent& event) override
+        {
+            if (on_knob_released && is_enabled())
+                on_knob_released(value());
+
+            GSlider::mouseup_event(event);
+        }
+    };
+
+    PlaybackManager m_manager;
+    float m_sample_ratio;
+    RefPtr<GLabel> m_status;
+    RefPtr<GLabel> m_elapsed;
+    RefPtr<GLabel> m_remaining;
+    RefPtr<Slider> m_slider;
+    RefPtr<SampleWidget> m_sample_widget;
+    RefPtr<GraphicsBitmap> m_play_icon { GraphicsBitmap::load_from_file("/res/icons/16x16/play.png") };
+    RefPtr<GraphicsBitmap> m_pause_icon { GraphicsBitmap::load_from_file("/res/icons/16x16/pause.png") };
+    RefPtr<GButton> m_play;
+};

Applications/SoundPlayer/main.cpp

@@ -1,11 +1,18 @@
-#include "SampleWidget.h"
+#include "SoundPlayerWidget.h"
+#include <AK/StringBuilder.h>
 #include <LibAudio/ABuffer.h>
 #include <LibAudio/AClientConnection.h>
 #include <LibAudio/AWavLoader.h>
 #include <LibCore/CTimer.h>
+#include <LibDraw/CharacterBitmap.h>
+#include <LibGUI/GAction.h>
 #include <LibGUI/GApplication.h>
 #include <LibGUI/GBoxLayout.h>
 #include <LibGUI/GButton.h>
+#include <LibGUI/GLabel.h>
+#include <LibGUI/GMenu.h>
+#include <LibGUI/GMenuBar.h>
+#include <LibGUI/GSlider.h>
 #include <LibGUI/GWidget.h>
 #include <LibGUI/GWindow.h>
 #include <stdio.h>
@@ -30,43 +37,24 @@ int main(int argc, char** argv)
     auto audio_client = AClientConnection::construct();
     audio_client->handshake();
 
+    auto app_menu = make<GMenu>("SoundPlayer");
+    app_menu->add_action(GCommonActions::make_quit_action([&](auto&) {
+        app.quit();
+    }));
+
+    auto menubar = make<GMenuBar>();
+    menubar->add_menu(move(app_menu));
+    app.set_menubar(move(menubar));
+
     auto window = GWindow::construct();
     window->set_title("SoundPlayer");
-    window->set_rect(300, 300, 300, 200);
-
-    auto widget = GWidget::construct();
-    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 = SampleWidget::construct(widget);
-
-    auto button = GButton::construct("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();
-
-    auto timer = CTimer::construct(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->set_resizable(false);
+    window->set_rect(300, 300, 350, 140);
+    window->set_icon(GraphicsBitmap::load_from_file("/res/icons/16x16/app-sound-player.png"));
 
+    auto player = SoundPlayerWidget::construct(audio_client, loader);
+    window->set_main_widget(player);
     window->show();
+
     return app.exec();
 }