Break apart the SetData function

Core/HLE/AtracCtx2.cpp

@@ -546,9 +546,12 @@ int Atrac2::SetData(const Track &track, u32 bufferAddr, u32 readSize, u32 buffer
 		}
 	}
 
-	// Copied from the old implementation, let's see where they are useful.
-	int firstExtra = track_.FirstOffsetExtra();
+	InitContext(0, bufferAddr, readSize, bufferSize);
+	return 0;
+}
 
+void Atrac2::InitContext(int offset, u32 bufferAddr, u32 readSize, u32 bufferSize) {
+	SceAtracIdInfo &info = context_->info;
 	// Copy parameters into struct.
 	info.buffer = bufferAddr;
 	info.bufferByte = bufferSize;
@@ -606,8 +609,6 @@ int Atrac2::SetData(const Track &track, u32 bufferAddr, u32 readSize, u32 buffer
 			Memory::Memset(info.buffer, 0, 128);
 		}
 	}
-
-	return 0;
 }
 
 u32 Atrac2::GetInternalCodecError() const {

Core/HLE/AtracCtx2.h

@@ -56,7 +56,7 @@ public:
 	u32 GetInternalCodecError() const override;
 
 private:
-	void SkipFramesAfterReset();
+	void InitContext(int offset, u32 bufferAddr, u32 readSize, u32 bufferSize);
 
 	void SeekToSample(int sample);