LibAudio/Piano: Replace floats with doubles

We should default to double-precision so that clients can make the
choice to use float or double.

Applications/Piano/AudioEngine.cpp

@@ -158,10 +158,10 @@ String AudioEngine::set_recorded_sample(const StringView& path)
         m_recorded_sample.clear();
     m_recorded_sample.resize(wav_buffer->sample_count());
 
-    float peak = 0;
+    double peak = 0;
     for (int i = 0; i < wav_buffer->sample_count(); ++i) {
-        float left_abs = fabs(wav_buffer->samples()[i].left);
+        double left_abs = fabs(wav_buffer->samples()[i].left);
-        float right_abs = fabs(wav_buffer->samples()[i].right);
+        double right_abs = fabs(wav_buffer->samples()[i].right);
         if (left_abs > peak)
             peak = left_abs;
         if (right_abs > peak)
@@ -228,8 +228,8 @@ Audio::Sample AudioEngine::recorded_sample(size_t note)
     int t = m_pos[note];
     if (t >= m_recorded_sample.size())
         return 0;
-    float w_left = m_recorded_sample[t].left;
+    double w_left = m_recorded_sample[t].left;
-    float w_right = m_recorded_sample[t].right;
+    double w_right = m_recorded_sample[t].right;
     if (t + 1 < m_recorded_sample.size()) {
         double t_fraction = m_pos[note] - t;
         w_left += (m_recorded_sample[t + 1].left - m_recorded_sample[t].left) * t_fraction;

Applications/Piano/SamplerWidget.cpp

@@ -46,7 +46,7 @@ WaveEditor::~WaveEditor()
 {
 }
 
-int WaveEditor::sample_to_y(float percentage) const
+int WaveEditor::sample_to_y(double percentage) const
 {
     double portion_of_half_height = percentage * ((frame_inner_rect().height() - 1) / 2.0);
     double y = (frame_inner_rect().height() / 2.0) + portion_of_half_height;

Applications/Piano/SamplerWidget.h

@@ -45,7 +45,7 @@ private:
 
     virtual void paint_event(GUI::PaintEvent&) override;
 
-    int sample_to_y(float percentage) const;
+    int sample_to_y(double percentage) const;
 
     AudioEngine& m_audio_engine;
 };

Libraries/LibAudio/Buffer.h

@@ -43,14 +43,14 @@ struct Sample {
     }
 
     // For mono
-    Sample(float left)
+    Sample(double left)
         : left(left)
         , right(left)
     {
     }
 
     // For stereo
-    Sample(float left, float right)
+    Sample(double left, double right)
         : left(left)
         , right(right)
     {
@@ -71,7 +71,7 @@ struct Sample {
 
     void scale(int percent)
     {
-        float pct = (float)percent / 100.0;
+        double pct = (double)percent / 100.0;
         left *= pct;
         right *= pct;
     }
@@ -83,8 +83,8 @@ struct Sample {
         return *this;
     }
 
-    float left;
+    double left;
-    float right;
+    double right;
 };
 
 // Small helper to resample from one playback rate to another
@@ -92,16 +92,16 @@ struct Sample {
 // Should do better...
 class ResampleHelper {
 public:
-    ResampleHelper(float source, float target);
+    ResampleHelper(double source, double target);
 
-    void process_sample(float sample_l, float sample_r);
+    void process_sample(double sample_l, double sample_r);
-    bool read_sample(float& next_l, float& next_r);
+    bool read_sample(double& next_l, double& next_r);
 
 private:
-    const float m_ratio;
+    const double m_ratio;
-    float m_current_ratio { 0 };
+    double m_current_ratio { 0 };
-    float m_last_sample_l { 0 };
+    double m_last_sample_l { 0 };
-    float m_last_sample_r { 0 };
+    double m_last_sample_r { 0 };
 };
 
 // A buffer of audio samples, normalized to 44100hz.

Libraries/LibAudio/WavLoader.cpp

@@ -182,19 +182,19 @@ bool WavLoader::parse_header()
     return true;
 }
 
-ResampleHelper::ResampleHelper(float source, float target)
+ResampleHelper::ResampleHelper(double source, double target)
     : m_ratio(source / target)
 {
 }
 
-void ResampleHelper::process_sample(float sample_l, float sample_r)
+void ResampleHelper::process_sample(double sample_l, double sample_r)
 {
     m_last_sample_l = sample_l;
     m_last_sample_r = sample_r;
     m_current_ratio += 1;
 }
 
-bool ResampleHelper::read_sample(float& next_l, float& next_r)
+bool ResampleHelper::read_sample(double& next_l, double& next_r)
 {
     if (m_current_ratio > 0) {
         m_current_ratio -= m_ratio;
@@ -209,8 +209,8 @@ bool ResampleHelper::read_sample(float& next_l, float& next_r)
 template<typename SampleReader>
 static void read_samples_from_stream(BufferStream& stream, SampleReader read_sample, Vector<Sample>& samples, ResampleHelper& resampler, int num_channels)
 {
-    float norm_l = 0;
+    double norm_l = 0;
-    float norm_r = 0;
+    double norm_r = 0;
 
     switch (num_channels) {
     case 1:
@@ -245,7 +245,7 @@ static void read_samples_from_stream(BufferStream& stream, SampleReader read_sam
     }
 }
 
-static float read_norm_sample_24(BufferStream& stream)
+static double read_norm_sample_24(BufferStream& stream)
 {
     u8 byte = 0;
     stream >> byte;
@@ -259,21 +259,21 @@ static float read_norm_sample_24(BufferStream& stream)
     value = sample1 << 8;
     value |= (sample2 << 16);
     value |= (sample3 << 24);
-    return float(value) / std::numeric_limits<i32>::max();
+    return double(value) / std::numeric_limits<i32>::max();
 }
 
-static float read_norm_sample_16(BufferStream& stream)
+static double read_norm_sample_16(BufferStream& stream)
 {
     i16 sample = 0;
     stream >> sample;
-    return float(sample) / std::numeric_limits<i16>::max();
+    return double(sample) / std::numeric_limits<i16>::max();
 }
 
-static float read_norm_sample_8(BufferStream& stream)
+static double read_norm_sample_8(BufferStream& stream)
 {
     u8 sample = 0;
     stream >> sample;
-    return float(sample) / std::numeric_limits<u8>::max();
+    return double(sample) / std::numeric_limits<u8>::max();
 }
 
 // ### can't const this because BufferStream is non-const