From d131b9415d6f85e8da2461893941aac24eb2ab35 Mon Sep 17 00:00:00 2001
From: "Yuto Terada (indigo-san)"
 <66758394+indigo-san@users.noreply.github.com>
Date: Tue, 12 Sep 2023 22:43:06 +0900
Subject: [PATCH] =?UTF-8?q?Pcm.Compound=E3=83=A1=E3=82=BD=E3=83=83?=
 =?UTF-8?q?=E3=83=89=E3=82=92=E4=BF=AE=E6=AD=A3=20(#711)?=
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* Pcm.Compoundメソッドを修正

* Fix Pcm.Compound
---
 src/Beutl.Engine/Media/Music/Pcm.cs | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/Beutl.Engine/Media/Music/Pcm.cs b/src/Beutl.Engine/Media/Music/Pcm.cs
index bf94e24cd..cf25b87fa 100644
--- a/src/Beutl.Engine/Media/Music/Pcm.cs
+++ b/src/Beutl.Engine/Media/Music/Pcm.cs
@@ -131,17 +131,21 @@ public void Compound(Pcm<T> sound)
     {
         if (sound.SampleRate != SampleRate) throw new Exception("Sounds with different SampleRates cannot be synthesized.");
 
-        Parallel.For(0, Math.Min(sound.NumSamples, NumSamples), i => DataSpan[i] = T.Compound(DataSpan[i], sound.DataSpan[i]));
+        Compound(0, sound);
     }
 
     public void Compound(int start, Pcm<T> sound)
     {
         if (sound.SampleRate != SampleRate) throw new Exception("Sounds with different SampleRates cannot be synthesized.");
 
-        Parallel.For(
-            start,
-            Math.Min(sound.NumSamples, NumSamples),
-            i => DataSpan[i] = T.Compound(DataSpan[i], sound.DataSpan[i - start]));
+        Parallel.For(start, NumSamples, i =>
+        {
+            int j = i - start;
+            if (j < sound.NumSamples)
+            {
+                DataSpan[i] = T.Compound(DataSpan[i], sound.DataSpan[j]);
+            }
+        });
     }
 
     public Pcm<T> Resamples(int frequency)