{"id":5171,"date":"2020-02-15T17:57:34","date_gmt":"2020-02-15T15:57:34","guid":{"rendered":"https:\/\/unitycoder.com\/blog\/?p=5171"},"modified":"2020-03-24T13:28:27","modified_gmt":"2020-03-24T11:28:27","slug":"encode-decode-audio-to-from-png-alpha-channel","status":"publish","type":"post","link":"https:\/\/unitycoder.com\/blog\/2020\/02\/15\/encode-decode-audio-to-from-png-alpha-channel\/","title":{"rendered":"Encode\/Decode Audio To\/From PNG Alpha Channel"},"content":{"rendered":"\n

Small test on embedding Audio data into PNG alpha channel.
With added option to shuffle pixels to hide\/”encrypt” original image and sound.

To make sound file small enough, use this option to set low hz<\/a>.

Ideas for later:<\/strong>
– Compress audio (tested RLE but didn’t do much with audio)
– Use full texture size automatically (currently just fills as long as have data)
– Resample audio in script, instead setting sample rate in audio importer
– Option to encode seed and\/or hz value into texture<\/p>\n\n\n\n

Sources:<\/strong> (take both scripts)
https:\/\/gist.github.com\/unitycoder\/6fece768157c038fb4c28d4b59931625<\/a><\/p>\n\n\n\n

\"\"
full mp3 (at 1000hz quality) embedded into 512×512 PNG Alpha channel
(note the alpha channel values starting from bottom)<\/figcaption><\/figure>\n\n\n\n
\"\"
Same image and mp3 as above, but Shuffle pixels is enabled
(seed=123 and samplerate=1000 if you want to decode)<\/figcaption><\/figure>\n\n\n\n

Example results<\/p>\n\n\n\n

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