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diff --git a/src/InputReader.h b/src/InputReader.h
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+/*
+   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
+   Her Majesty the Queen in Right of Canada (Communications Research
+   Center Canada)
+
+   Copyrigth (C) 2013
+   Matthias P. Braendli, matthias.braendli@mpb.li
+ */
+/*
+   This file is part of CRC-DADMOD.
+
+   CRC-DADMOD is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the
+   License, or (at your option) any later version.
+
+   CRC-DADMOD is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with CRC-DADMOD.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef INPUTREADER_H
+#define INPUTREADER_H
+
+#ifdef HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+#include <cstdio>
+#include "porting.h"
+#include "Log.h"
+
+/* Known types of input streams. Description taken from the CRC mmbTools forum.
+
+    All numbers are little-endian.
+
+    Framed format is used for file recording. It is the default format. The
+    padding can be removed from data. Format:
+        uint32_t nbFrames
+        for each frame
+          uint16_t frameSize
+          uint8_t data[frameSize]
+
+    Streamed format is used for streamed applications. As the total number of
+    frames is unknown before end of transmission, the corresponding field is
+    removed. The padding can be removed from data. Format:
+        for each frame
+          uint16_t frameSize
+          uint8_t data[frameSize]
+
+    Raw format is a bit-by-bit (but byte aligned on sync) recording of a G.703
+    data stream. The padding is always present. Format:
+        for each frame
+          uint8_t data[6144]
+
+    Please note that our raw format can also be referred to as ETI(NI, G.703) or ETI(NI).
+*/
+enum EtiStreamType {
+    ETI_STREAM_TYPE_NONE = 0,
+    ETI_STREAM_TYPE_RAW,
+    ETI_STREAM_TYPE_STREAMED,
+    ETI_STREAM_TYPE_FRAMED,
+};
+
+class InputReader
+{
+    public:
+        // Save the next frame into the buffer, and return the number of bytes read.
+        virtual int GetNextFrame(void* buffer) = 0;
+};
+
+class InputFileReader : public InputReader
+{
+    public:
+        InputFileReader(Logger logger) :
+            streamtype_(ETI_STREAM_TYPE_NONE),
+            inputfile_(NULL), logger_(logger) {};
+
+        ~InputFileReader()
+        {
+            fprintf(stderr, "\nClosing input file...\n");
+
+            if (inputfile_ != NULL) {
+                fclose(inputfile_);
+            }
+        }
+
+        // open file and determine stream type
+        int Open(std::string filename);
+
+        // Print information about the file opened
+        void PrintInfo();
+
+        // Rewind the file, and replay anew
+        // returns 0 on success, -1 on failure
+        int Rewind();
+
+        // Put next frame into buffer. This function will never write more than
+        // 6144 bytes into buffer.
+        // returns number of bytes written to buffer, 0 on eof, -1 on error
+        int GetNextFrame(void* buffer);
+
+        EtiStreamType GetStreamType()
+        {
+            return streamtype_;
+        }
+
+    private:
+        int IdentifyType();
+
+        std::string filename_;
+        EtiStreamType streamtype_;
+        FILE* inputfile_;
+        Logger logger_;
+
+        size_t inputfilelength_;
+        uint64_t nbframes_; // 64-bit because 32-bit overflow is
+                            // after 2**32 * 24ms ~= 3.3 years
+};
+
+#endif