SoundPlayer: Reduce sample buffer size and add a sample load event

Userland/Applications/SoundPlayer/CMakeLists.txt

@@ -3,6 +3,10 @@ set(SOURCES
     PlaybackManager.cpp
     SampleWidget.cpp
     SoundPlayerWidget.cpp
+    SoundPlayerWidgetAdvancedView.cpp
+    BarsVisualizationWidget.cpp
+    AudioAlgorithms.cpp
+    NoVisualizationWidget.cpp
 )
 
 serenity_app(SoundPlayer ICON app-sound-player)

Userland/Applications/SoundPlayer/PlaybackManager.cpp

@@ -128,13 +128,16 @@ 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)
+            if (buffer) {
                 m_buffers.append(buffer);
+            }
         }
     }
 
     if (m_next_ptr < m_buffers.size()) {
         m_next_buffer = m_buffers.at(m_next_ptr++);
+        if (on_load_sample_buffer)
+            on_load_sample_buffer(*m_next_buffer);
     } else {
         m_next_buffer = nullptr;
     }
@@ -163,7 +166,6 @@ void PlaybackManager::next_buffer()
 {
     if (on_update)
         on_update();
-
     if (m_paused)
         return;
 

Userland/Applications/SoundPlayer/PlaybackManager.h

@@ -32,7 +32,7 @@
 #include <LibAudio/Loader.h>
 #include <LibCore/Timer.h>
 
-#define PLAYBACK_MANAGER_BUFFER_SIZE 64 * KiB
+#define PLAYBACK_MANAGER_BUFFER_SIZE 48 * KiB
 #define PLAYBACK_MANAGER_RATE 44100
 
 class PlaybackManager final {
@@ -56,6 +56,7 @@ public:
     NonnullRefPtr<Audio::ClientConnection> connection() const { return m_connection; }
 
     Function<void()> on_update;
+    Function<void(Audio::Buffer&)> on_load_sample_buffer;
 
 private:
     void next_buffer();