| From Vaughan Johnson <
vaughan@...>
| Wed, 02 Jul 2008 20:36:09 -0700
| Subject: [Audacity-devel] Recording Channels
> I think it's right, Martyn, but can somebody with an ASIO-capable build
> and a multi-channel ASIO device check that it works for >2 simultaneous
> channels?
I asked Andy Latham on the Forum to check 1.3.6a3. He can actually
record up to 8 channels at once on Windows XP using Audacity 1.2.6 and
1.3.4 out of the box, using an M-Audio Delta 1010LT Sound Card -
providing he uses old drivers from August 2007. The latest ones
do not allow recording of the speaker output (it's a common theme
now that this feature is being progressively withdrawn from drivers),
and only allow recording two channels at once.
Anyway, with the older drivers, Andy can in 1.2.6/1.3.4 select each
stereo pair of inputs (1+2, 3+4 ...) individually and record in stereo,
or he can select "Multi" and record up to 8 at once. With 1.3.6a he says
he can no longer record more than 2 channels using any of the sources.
He still has access to the 'Multi' source, but Audacity now only presents
him with a maximum of two channels for that source.
So that isn't exactly what Vaughan asked to test, but gives us a clue
this may not be correct yet.
Gale
> Martyn Shaw wrote:
> > No response so I committed this. Now you don't get offered 16
> > channels to record if your hardware doesn't support it. Hope that's OK.
> >
> > Martyn
> >
> > Martyn Shaw wrote:
> >
> >> Hi
> >>
> >> I don't have a device with more than 2 recording channels, but I'm
> >> offered more in prefs -> Audio I/O ->Recording -> Channels.
> >>
> >> Is the following a good idea?
> >>
> >> diff -u -r1.55 AudioIOPrefs.cpp
> >> --- AudioIOPrefs.cpp 23 May 2008 16:01:24 -0000 1.55
> >> +++ AudioIOPrefs.cpp 10 Jun 2008 23:24:08 -0000
> >> @@ -76,6 +76,7 @@
> >> int nDevices = Pa_CountDevices();
> >> #endif
> >>
> >> + int numChannels = 0; // find max no. of record channels available
> >> for(j=0; j<nDevices; j++) {
> >> const PaDeviceInfo* info = Pa_GetDeviceInfo(j);
> >> Name = DeviceName(info);
> >> @@ -87,11 +88,12 @@
> >> if (info->maxInputChannels > 0) {
> >> mmRecordNames.Add( Name );
> >> mmRecordLabels.Add( Label );
> >> + if (info->maxInputChannels > numChannels)
> >> + numChannels = info->maxInputChannels;
> >> }
> >> }
> >>
> >> // Channel counts, mono, stereo etc...
> >> - const int numChannels = 16;
> >> for(int c=0; c<numChannels; c++)
> >> {
> >> mmChannelNames.Add( wxString::Format(wxT("%d"), c+1));
> >>
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