Jul 20, 2023

Audio and video watermarking tool

A sound file is read by the software, and a 128-bit message is stored in a watermark in the output sound file. For human listeners, the files typically sound the same.

However, the 128-bit message can be retrieved from the output sound file. Our tests show, that even if the file is converted to mp3 or ogg with bitrate 128 kbit/s or higher, the watermark usually can be retrieved without problems. The process of retrieving the message does not need the original audio file blind decoding.

Internally, audiowmark is using the patchwork algorithm to hide the data in the spectrum of the audio file. The signal is split into 1024 sample frames. For each frame, some pseoudo-randomly selected amplitudes of the frequency bands of a 1024-value FFTs are increased or decreased slightly, which can be detected later.

Checkout these related ports:
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  • Zrythm - Modern music production system, also known as DAW
  • Zplugins-lv2 - Collection of LV2 plugins to be bundled with Zrythm
  • Zmusic - GZDoom's music system as a standalone library
  • Zita-rev1 - Reworked version of the reverb originally developed for Aeolus
  • Zita-resampler - C++ library for resampling audio signals
  • Zita-njbridge - Command line client to transmit audio over a local IP network
  • Zita-mu1 - Simple Jack app used to organise stereo monitoring
  • Zita-jclient - Library to create a Jack client with a few lines of C++
  • Zita-dpl1 - Look-ahead digital peak level limiter
  • Zita-convolver - Fast, partitioned convolution engine library
  • Zita-bls1 - Blumlein Shuffler converter of binaural signals to stereo speaker pair
  • Zita-at1 - Autotuner Jack application
  • Zita-alsa-pcmi - Easy access to ALSA PCM devices
  • Zinf - GTK-based MP3 player