fralomba / Forensics-Analysis-Of-Audio-Files

Audio File Format Analysis

Aims

• Given a couple of audio files, query and reference, estimate if both are produced by the same device.

Audio File Containers

• Audio Coding Format: The bit layout that defines audio data
  • Lossy (mp3, aac, …)
  • Lossless (wav, aiff, flac, …)
• Metadata:
  • General information
  • Specific information

Requirements

• ExifTool CLI
• MediaInfo CLI
• pyExifTool
• pyMediaInfo
• pymysql

How to use

• Macro.py Allows user to extract metadata from a sample and show them. The script is properly called as follows: python macro.py /path/to/file And produces a json output like:

var datas = [
	{‘label’: L1, ‘value’: V1}
	…
	{‘label’: Ln, ‘value’: Vn}
	];

• Compare.py Allows to compare couples of files. It shows their differences and highlights possible alerts due to manipulation. The script is properly called as follows: python compare.py /path/to/query /path/to/reference And produces a json output like:

var datas = [
	{‘label’: L1, ‘alert’: A1, ‘value1’: V11, ‘value2’: V21}
	…
	{‘label’: Ln, ‘alert’: An, ‘value1’: V2n, ‘value2’: V2n}

	];

• Classify.py Looks over a dataset, and scores the distance between various samples. The script is properly called as follow: python classify.py /path/to/file And produces a json output like:

var datas = [
	{‘label’: L1,‘score’: S1}
	…
	{‘label’: Ln,‘score’: Sn}

	];