pcm/Normalizer: add method Reset()

src/pcm/Normalizer.cxx

@@ -8,6 +8,16 @@
 #include "Traits.hxx"
 #include "util/Compiler.h"
 
+#include <algorithm> // for std::fill_n()
+
+void
+PcmNormalizer::Reset() noexcept
+{
+	prev_gain = 0;
+	pos = 0;
+	std::fill_n(peaks, bufsz, 0);
+}
+
 void
 PcmNormalizer::ProcessS16(int16_t *gcc_restrict dest,
 			  const std::span<const int16_t> src) noexcept

src/pcm/Normalizer.hxx

@@ -37,6 +37,8 @@ public:
 		delete[] peaks;
 	}
 
+	void Reset() noexcept;
+
 	//! Process 16-bit signed data
 	void ProcessS16(int16_t *dest, std::span<const int16_t> src) noexcept;
 };