If you're streaming the audio waveform, you can calculate the peak volume and adjust the gain.
Most streaming audio already share the same peak volume. The problem is compression. You can compress the hell out of audio, make it sound extremely loud, and it will still have the same peak volume as uncompressed audio.
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alt Hacker News
Most streaming audio already share the same peak volume. The problem is compression. You can compress the hell out of audio, make it sound extremely loud, and it will still have the same peak volume as uncompressed audio.