From bc51bc29337962f6ece3c153af8e65d4c0057ae3 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@gmail.com>
Date: Mon, 13 Mar 2023 13:52:43 +0100
Subject: [PATCH] pcm/Normalizer: add method Reset()

---
 src/filter/plugins/NormalizeFilterPlugin.cxx |  4 ++++
 src/pcm/Normalizer.cxx                       | 10 ++++++++++
 src/pcm/Normalizer.hxx                       |  2 ++
 3 files changed, 16 insertions(+)

diff --git a/src/filter/plugins/NormalizeFilterPlugin.cxx b/src/filter/plugins/NormalizeFilterPlugin.cxx
index e87ab637a..51e239e65 100644
--- a/src/filter/plugins/NormalizeFilterPlugin.cxx
+++ b/src/filter/plugins/NormalizeFilterPlugin.cxx
@@ -24,6 +24,10 @@ public:
 	NormalizeFilter &operator=(const NormalizeFilter &) = delete;
 
 	/* virtual methods from class Filter */
+	void Reset() noexcept override {
+		normalizer.Reset();
+	}
+
 	std::span<const std::byte> FilterPCM(std::span<const std::byte> src) override;
 };
 
diff --git a/src/pcm/Normalizer.cxx b/src/pcm/Normalizer.cxx
index 78c04d2fa..b5757adce 100644
--- a/src/pcm/Normalizer.cxx
+++ b/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
diff --git a/src/pcm/Normalizer.hxx b/src/pcm/Normalizer.hxx
index 155f16d18..911dd5d60 100644
--- a/src/pcm/Normalizer.hxx
+++ b/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;
 };