5 files changed, 14 insertions, 6 deletions
diff --git a/Userland/Applications/SoundPlayer/BarsVisualizationWidget.cpp b/Userland/Applications/SoundPlayer/BarsVisualizationWidget.cpp
index 4c0a584768..adf2dbdb73 100644
--- a/Userland/Applications/SoundPlayer/BarsVisualizationWidget.cpp
+++ b/Userland/Applications/SoundPlayer/BarsVisualizationWidget.cpp
@@ -5,8 +5,8 @@
  */
 
 #include "BarsVisualizationWidget.h"
-#include "AudioAlgorithms.h"
 #include <AK/Math.h>
+#include <LibDSP/FFT.h>
 #include <LibGUI/Event.h>
 #include <LibGUI/Menu.h>
 #include <LibGUI/Painter.h>
@@ -25,7 +25,7 @@ void BarsVisualizationWidget::paint_event(GUI::PaintEvent& event)
     if (m_sample_buffer.is_empty())
         return;
 
-    fft(m_sample_buffer, false);
+    LibDSP::fft(m_sample_buffer, false);
     double max = AK::sqrt(m_sample_count * 2.);
 
     double freq_bin = m_samplerate / (double)m_sample_count;
diff --git a/Userland/Applications/SoundPlayer/CMakeLists.txt b/Userland/Applications/SoundPlayer/CMakeLists.txt
index 578078938e..26f5e31c1f 100644
--- a/Userland/Applications/SoundPlayer/CMakeLists.txt
+++ b/Userland/Applications/SoundPlayer/CMakeLists.txt
@@ -13,11 +13,10 @@ set(SOURCES
     SampleWidget.cpp
     SoundPlayerWidgetAdvancedView.cpp
     BarsVisualizationWidget.cpp
-    AudioAlgorithms.cpp
     NoVisualizationWidget.cpp
     M3UParser.cpp
     PlaylistWidget.cpp
 )
 
 serenity_app(SoundPlayer ICON app-sound-player)
-target_link_libraries(SoundPlayer LibAudio LibGUI)
+target_link_libraries(SoundPlayer LibAudio LibDSP LibGUI)
diff --git a/Userland/Libraries/LibDSP/CMakeLists.txt b/Userland/Libraries/LibDSP/CMakeLists.txt
index a5de6f120e..f7dc72fcd1 100644
--- a/Userland/Libraries/LibDSP/CMakeLists.txt
+++ b/Userland/Libraries/LibDSP/CMakeLists.txt
@@ -3,6 +3,7 @@ set(SOURCES
     Track.cpp
     Effects.cpp
     Synthesizers.cpp
+    FFT.cpp
 )
 
 serenity_lib(LibDSP dsp)
diff --git a/Userland/Applications/SoundPlayer/AudioAlgorithms.cpp b/Userland/Libraries/LibDSP/FFT.cpp
index b25de59797..8083333f96 100644
--- a/Userland/Applications/SoundPlayer/AudioAlgorithms.cpp
+++ b/Userland/Libraries/LibDSP/FFT.cpp
@@ -4,10 +4,12 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include "AudioAlgorithms.h"
+#include "FFT.h"
 #include <AK/Complex.h>
 #include <AK/Math.h>
 
+namespace LibDSP {
+
 // This function uses the input vector as output too. therefore, if you wish to
 // leave it intact, pass a copy to this function
 //
@@ -56,3 +58,5 @@ void fft(Vector<Complex<double>>& sample_data, bool invert)
             data[i] /= n;
     }
 }
+
+}
diff --git a/Userland/Applications/SoundPlayer/AudioAlgorithms.h b/Userland/Libraries/LibDSP/FFT.h
index 904c9acefe..d13d358af2 100644
--- a/Userland/Applications/SoundPlayer/AudioAlgorithms.h
+++ b/Userland/Libraries/LibDSP/FFT.h
@@ -9,4 +9,8 @@
 #include <AK/Complex.h>
 #include <AK/Vector.h>
 
-void fft(Vector<Complex<double>>& sample_data, bool invert);
+namespace LibDSP {
+
+void fft(Vector<Complex<double>>& sample_data, bool invert = false);
+
+}