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diff --git a/engine/voice_codecs/frame_encoder/iframeencoder.h b/engine/voice_codecs/frame_encoder/iframeencoder.h
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+++ b/engine/voice_codecs/frame_encoder/iframeencoder.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef IFRAMEENCODER_H
+#define IFRAMEENCODER_H
+#pragma once
+
+
+// A frame encoder is a codec that encodes and decodes data in fixed-size frames.
+// VoiceCodec_Frame handles queuing of data and the IVoiceCodec interface.
+abstract_class IFrameEncoder
+{
+public:
+	virtual			~IFrameEncoder() {}
+
+	// This is called by VoiceCodec_Frame to see if it can initialize..
+	// Fills in the uncompressed and encoded frame size (both are in BYTES).
+	virtual bool	Init(int quality, int &rawFrameSize, int &encodedFrameSize) = 0;
+
+	virtual void	Release() = 0;
+	
+	// pUncompressed is 8-bit signed mono sound data with 'rawFrameSize' bytes.
+	// pCompressed is the size of encodedFrameSize.
+	virtual void	EncodeFrame(const char *pUncompressed, char *pCompressed) = 0;
+	
+	// pCompressed is encodedFrameSize.
+	// pDecompressed is where the 8-bit signed mono samples are stored and has space for 'rawFrameSize' bytes.
+	virtual void	DecodeFrame(const char *pCompressed, char *pDecompressed) = 0;
+
+	// Some codecs maintain state between Compress and Decompress calls. This should clear that state.
+	virtual bool	ResetState() = 0;
+};
+
+
+#endif // IFRAMEENCODER_H