BASS - Getting Audio Data for Spectrum Analysis/Display

[ralphy]

Is it possible to use

Code:

// get 1000 16 bit samples
short buffer[1000];
BASS_ChannelGetData(achannel,buffer,2000);

in PVRX2? (The BASS dll is from http://www.un4seen.com)

If so, how do I define achannel, and what would be a complete code snippet?

Alternatively, are there other tools which can be used to do a FFT and get some spectrum details of the audio currently being played (DVD/TV/Music etc) by PVRX2?

[sub]

To be honest, I have know no idea. If this BASS dll hooks into some of the underlying windows media stuff and allows you to capture samples from any app using directshow to play audio, then it might also work with GB-PVR.

[pBS]

i used to use an avisynth filter that took audio and made a spectrum scope visual while you played, i used it to get visualizations on mvp...
but i find avisynth very buggy when it comes to playing back recorded tv...

so i use Winamp and a LCDsmartie plugin to get a full spectrum analyzer on my vfd..
doesn't work with spdif/hdmi outs but it does with everything else...
winamp can use line-in or wave mix or whatever your sound card calls it to 'eavesdrop' on the audio being played and serves up a nice set of shared memory data w/the spectrum info.....apparently winamp has an api for fft data reading...

and that is 'read' by the smartie plugin...

nice part is, i can have an infinite number of channels, i run a 20 band spectrum when audio is playing, and a 5 band when it's tv...
seems to work flawlessly and efficiently, only have to occasionally restart it after a few days monitoring..
not sure if source is available but it'd be a great place to start..winamp folks are fairly open about the workings...

[whurlston]

I'm working on a C# implementation of the Vista Core Audio API which will include the DeviceTopology API that should give you what you need. It will only work with Vista though and not XP and it may take me a while.