Implement Sound::FromNoise()

include/ReMixer/sound.h

@@ -78,6 +78,9 @@ namespace ReMixer {
         /// @see https://en.wikipedia.org/wiki/Square_wave
         static Sound FromSquareWave(float length, float wavelength, float amplitude, float phase);
 
+
+        static Sound FromNoise(float length, float amplitude = 1.f);
+
         /// Fills this sound instance with data from a file encoded with OGG vorbis, usually with an .ogg extension.
         /// @param file_name The full path relative to the executable in which the file is located.
         /// @see https://en.wikipedia.org/wiki/Vorbis
@@ -105,6 +108,8 @@ namespace ReMixer {
         void LoadTriangleWave(float length, float wavelength, float amplitude, float phase);
         void LoadSquareWave(float length, float wavelength, float amplitude, float phase);
 
+        void LoadNoise(float length, float amplitude = 1.f);
+
         /// Returns the sample count of the sound.
         uint SampleCount() const;;
 

main.cpp

@@ -45,11 +45,13 @@
     Sound sawtooth_sound = Sound::FromSawtoothWave(5.f, 0.025f, 2000, 0);
     Sound triangle_sound = Sound::FromTriangleWave(5.f, 0.025f, 2000, 0);
     Sound square_sound   = Sound::FromSquareWave(5.f, 0.025f, 2000, 0);
+    Sound noise_sound    = Sound::FromNoise(5.f, 0.01);
 
     server.Play(test_stream, sine_sound);
     server.Play(test_stream, sawtooth_sound);
     server.Play(test_stream, triangle_sound);
     server.Play(test_stream, square_sound);
+    server.Play(test_stream, noise_sound);
     server.Play(test_stream, test_sound);
 
     while (true) {

src/linux/PulseSubsystem.cpp

@@ -3,8 +3,7 @@
 void ReMixer::PulseAudioSubsystem::Play(ReMixer::PulseStream &stream, const ReMixer::Sound &sound) {
 
     // Check parameters and compatibility between stream and sound.
-    if (stream.SampleRate() != sound.SampleRate())
-    {
+    if (stream.SampleRate() != sound.SampleRate()) {
         std::cerr << "There is an incongruency in sample rate between the stream and the sound file. "
                   << std::format("Stream: {}hz, meanwhile sound: {}hz", stream.SampleRate(), sound.SampleRate())
                   << std::endl;

src/linux/sound.cpp

@@ -265,7 +265,6 @@ void ReMixer::Sound::LoadSquareWave(float length, float wavelength, float amplit
 
         audio_data.push_back(low_half);
         audio_data.push_back(high_half);
-
     }
 }
 
@@ -293,6 +292,35 @@ ReMixer::Sound ReMixer::Sound::FromSquareWave(float length, float wavelength, fl
     return sound;
 }
 
+void ReMixer::Sound::LoadNoise(float length, float amplitude) {
+    stream_mode = StreamMode::MONO;
+    sample_rate = 44.1_kHz;
+
+    uint samples = length * SampleRate();
+
+    srand(time(NULL));
+
+    for (int i = 0; i < samples; i++) {
+        float time = (float) i / (float) sample_rate;
+
+        float wave = (rand() % 65535) - 32000;
+
+        short sample = (short) (wave*amplitude);
+        char low_half = sample;
+        char high_half = (sample >> 8);
+
+        audio_data.push_back(low_half);
+        audio_data.push_back(high_half);
+
+    }
+}
+
+ReMixer::Sound ReMixer::Sound::FromNoise(float length, float amplitude) {
+    Sound sound;
+    sound.LoadNoise(length, amplitude);
+    return sound;
+}
+
 int mix(int a, int b) {
     return std::clamp(a + b, -128, 128);
 }