AQC - Audio Quality Control

Tool for checking sets of audio files against a set of rules.

Installation & Usage

1. Install Python v3.9+
2. Install aqc with pip:

pip install git+https://github.com/schtschenok/aqc.git

3. Run:

aqc -c /path/to/config.toml -i /path/to/input/folder -o /path/to/output/file.json

Example

This config (config_examples/test_config.toml)

# Peak
[peak]
reference_values.maximum = -3  # dB
reference_values.minimum = -9  # dB

# True Peak
[true_peak]
reference_values.maximum = -1  # dB

# Peak-to-Average Power ratio in dB, also known as Crest Factor
[papr]
reference_values.minimum = 3  # dB

can produce this output.json

{
    "date": "2024-07-12T17:03:03.707922+04:00",
    "base_directory": "D:\\Projects\\Python\\Git\\aqc\\test_files",
    "files": {
        "short.wav": {
            "peak": {
                "pass": "true",
                "value": -6.000037678251388,
                "unit": "dB"
            },
            "true_peak": {
                "pass": "true",
                "value": -3.915757140377444,
                "unit": "dBTP"
            },
            "papr": {
                "pass": "false",
                "value": 2.884500243168704,
                "unit": "dB"
            }
        }
    }
}

Analyzers

Peak

Peak volume of the audio file.
Unit: dB.

True Peak

True Peak volume of the audio file using two-fold oversampling.
Unit: dBTP.

PAPR (Peak-to-Average Power Ratio)

The difference between the Peak and RMS (Root Mean Square) levels of the audio file.
Unit: dB.

RMS

The Root Mean Square volume of the audio file.
Unit: dB.

LUFS

The integrated loudness of the audio file measured in Loudness Units relative to Full Scale. For files shorter than 4 seconds, it uses a modified algorithm that works better for short files but is not entirely standard-compliant.
Unit: dB.

Length

The duration of the audio file.
Unit: Seconds.

Channel Count

The number of audio channels in the file.
Unit: Channels.

Sample Rate

The number of samples of audio carried per second.
Unit: Hz.

Subtype

The audio file format subtype (e.g., PCM_16, PCM_24).
Unit: N/A.

Leading Silence

The duration of silence from the start of the audio file.
Unit: Seconds.

Trailing Silence

The duration of silence at the end of the audio file.
Unit: Seconds.

Channel Difference

The maximum difference in volume between any two channels in the audio file.
Unit: dB.

TODO

• DC offset analyzer (learned the hard way)
• Detect cut tails at the end of the file
• Better exclude silence from PAPR calculation
• Proper GUI (but do we need it?)
• Output formats
• Documentation
• Tests maybe

Thanks

The development of this tool has been supported by Konstantin Knerik Studio.