Add audio white noise generator

libs/audio/include/psemek/audio/white_noise.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <vector>
+
+namespace psemek::audio
+{
+
+	std::vector<float> white_noise(std::size_t sample_count);
+
+}

libs/audio/source/wave/karplus_strong.cpp

@@ -1,5 +1,6 @@
 #include <psemek/audio/wave/karplus_strong.hpp>
 #include <psemek/audio/constants.hpp>
+#include <psemek/audio/white_noise.hpp>
 #include <psemek/random/generator.hpp>
 #include <psemek/random/uniform.hpp>
 
@@ -16,16 +17,8 @@ namespace psemek::audio
 			: stream
 		{
 			karplus_strong_impl(float frequency)
-				: buffer_(2 * std::round(audio::frequency / frequency))
+				: buffer_(white_noise(2 * std::round(audio::frequency / frequency)))
-			{
+			{}
-				random::generator rng{0x4b0a763ef6573bf2ull, 0};
-				for (std::size_t i = 0; i < buffer_.size(); i += 2)
-				{
-					float v = random::uniform(rng, -1.f, 1.f);
-					buffer_[i + 0] = v;
-					buffer_[i + 1] = v;
-				}
-			}
 
 			std::optional<std::size_t> length() const override
 			{

libs/audio/source/white_noise.cpp

@@ -0,0 +1,19 @@
+#include <psemek/audio/white_noise.hpp>
+
+#include <psemek/random/generator.hpp>
+#include <psemek/random/uniform.hpp>
+
+namespace psemek::audio
+{
+
+	std::vector<float> white_noise(std::size_t sample_count)
+	{
+		random::generator rng{0x4b0a763ef6573bf2ull, 0};
+
+		std::vector<float> result(sample_count);
+		for (auto & v : result)
+			v = random::uniform<float>(rng, {-1.f, 1.f});
+		return result;
+	}
+
+}