Tracking current DMA-sample sound level

Did anyone ever wrote a sound volume level graph?

What I mean is something like WinAmp (and almost

any other music player) shows on the screen when

a music file is heard - a graph which gets

changed according to the level of sound.

I thought about writing one, but I am not sure

how to track the volume of the sample currently

played by the dma, does anyone know?

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