audio: Add pitch API

Author: adazem009

src/audio/iaudioplayer.h

@@ -16,6 +16,9 @@ class IAudioPlayer
         virtual float volume() const = 0;
         virtual void setVolume(float volume) = 0;
 
+        virtual float pitch() const = 0;
+        virtual void setPitch(float pitch) = 0;
+
         virtual bool isLoaded() const = 0;
 
         virtual void start() = 0;

src/audio/internal/audioplayer.cpp

@@ -58,6 +58,7 @@ bool AudioPlayer::load(unsigned int size, const void *data, unsigned long sample
 
     m_loaded = true;
     ma_sound_set_volume(m_sound, m_volume);
+    ma_sound_set_pitch(m_sound, m_pitch);
     return true;
 }
 
@@ -81,6 +82,7 @@ bool AudioPlayer::loadCopy(IAudioPlayer *player)
     m_loaded = true;
     m_copy = true;
     ma_sound_set_volume(m_sound, m_volume);
+    ma_sound_set_pitch(m_sound, m_pitch);
     return true;
 }
 
@@ -99,6 +101,28 @@ void AudioPlayer::setVolume(float volume)
     ma_sound_set_volume(m_sound, volume);
 }
 
+float AudioPlayer::pitch() const
+{
+    return m_pitch;
+}
+
+void AudioPlayer::setPitch(float pitch)
+{
+    /*
+     * 0.5 -> 220 Hz
+     * 1 -> 440 Hz
+     * 2 -> 880 Hz
+     * 4 -> 1760 Hz
+     * ...
+     */
+    m_pitch = pitch;
+
+    if (!m_loaded)
+        return;
+
+    ma_sound_set_pitch(m_sound, pitch);
+}
+
 bool AudioPlayer::isLoaded() const
 {
     return m_loaded;

src/audio/internal/audioplayer.h

@@ -22,6 +22,9 @@ class AudioPlayer : public IAudioPlayer
         float volume() const override;
         void setVolume(float volume) override;
 
+        float pitch() const override;
+        void setPitch(float pitch) override;
+
         bool isLoaded() const override;
 
         void start() override;
@@ -36,6 +39,7 @@ class AudioPlayer : public IAudioPlayer
         bool m_copy = false;
         bool m_started = false;
         float m_volume = 1;
+        float m_pitch = 1;
 };
 
 } // namespace libscratchcpp

src/audio/internal/audioplayerstub.cpp

@@ -28,6 +28,16 @@ void AudioPlayerStub::setVolume(float volume)
     m_volume = volume;
 }
 
+float AudioPlayerStub::pitch() const
+{
+    return m_pitch;
+}
+
+void AudioPlayerStub::setPitch(float pitch)
+{
+    m_pitch = pitch;
+}
+
 bool AudioPlayerStub::isLoaded() const
 {
     return true;

src/audio/internal/audioplayerstub.h

@@ -18,6 +18,9 @@ class AudioPlayerStub : public IAudioPlayer
         float volume() const override;
         void setVolume(float volume) override;
 
+        float pitch() const override;
+        void setPitch(float pitch) override;
+
         bool isLoaded() const override;
 
         void start() override;
@@ -27,6 +30,7 @@ class AudioPlayerStub : public IAudioPlayer
 
     private:
         float m_volume = 1;
+        float m_pitch = 1;
 };
 
 } // namespace libscratchcpp

test/audio/audioplayer_test.cpp

@@ -12,3 +12,12 @@ TEST(AudioPlayerTest, Volume)
     player.setVolume(0.86f);
     ASSERT_EQ(player.volume(), 0.86f);
 }
+
+TEST(AudioPlayerTest, Pitch)
+{
+    AudioPlayer player;
+    ASSERT_EQ(player.pitch(), 1);
+
+    player.setPitch(1.5f);
+    ASSERT_EQ(player.pitch(), 1.5f);
+}

test/mocks/audioplayermock.h

@@ -14,6 +14,9 @@ class AudioPlayerMock : public IAudioPlayer
         MOCK_METHOD(float, volume, (), (const, override));
         MOCK_METHOD(void, setVolume, (float), (override));
 
+        MOCK_METHOD(float, pitch, (), (const, override));
+        MOCK_METHOD(void, setPitch, (float), (override));
+
         MOCK_METHOD(bool, isLoaded, (), (const, override));
 
         MOCK_METHOD(void, start, (), (override));