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Hi,
i would like to ask whether it is possible (if yes, how?) to implement a Stereo VU Meter for Audio CDs using FMod with Delphi.

Thanks
Martin Brandt

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You have to record the signal as an external source and then analyze that signal in your software. FMod can also record, but look that in Win9x/ME this means lock the recording channel of the soundcard, so you will be unable to record from another software contemporaneously.

There is another solution (digital extraction), but it’s more complex…

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And in case we want to have a stereo VU for a stream what do we have to do?
A “channel” in FMOD gets both stream channels, and in this way we have an overall one and only VU of the stream.
Do you have any idea?

c u laser

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user9, if you want a VU meter for a stream you may use a stream dsp callback and analyze the signal. The signal is always 16-bit stereo, this means that a sample is always 4 bytes.

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Thank you my friend. The truth is that I never worked with DSP. I will check it out…

c u laser

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[quote="brett":375d4f1f]ive been toying with the idea of doing a ‘digital rip’ mode of cd playback which would allow dsp and vu etc.. [/quote:375d4f1f]

well…. a ripper is a good idea. This allow to mix 2 tracks of CD, for example….

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It might take a while to do it, but you could implement a raw read mode, in which you could open single CDA tracks from the cd as if they were regular files and then read the raw data from them. This would allow VU and DSP and spectrum… etc.

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[quote="brett":3357kdux]ive been toying with the idea of doing a ‘digital rip’ mode of cd playback which would allow dsp and vu etc.. but its quite complex and not a very open standard by the look of it (aspi even took the sdk off their site), so it might be that recording with a loop back cable is the only way at the moment.[/quote:3357kdux]

CDex a CD-Ripper, thus extracting digital audio data from an Audio CD. The application supports many Audio encoders, like MPEG (MP2,MP3), VQF, AAC encoders.

😉
[url:3357kdux]http://sourceforge.net/projects/cdexos/[/url:3357kdux]

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CDex is in GPL … Not good for FMOD :roll:

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