Re: User-land driver for channel mapping
Re: User-land driver for channel mapping
- Subject: Re: User-land driver for channel mapping
- From: Jeff Moore <email@hidden>
- Date: Tue, 8 Apr 2008 14:11:40 -0700
I'd also like to look a little at this statement because near as I can
tell, it is false. Can you explain a bit more about this?
The reason I think that this statement is false is that I can achieve
this effect entirely within QTPlayer. I don't have to write a single
line of code. Here's what I did:
0) I enabled QT Pro.
1) I made an aggregate device in AMS that had two stereo streams and
made that device the default output device. Note that I did this
because I didn't happen to have a multi-channel device on my system at
the moment. If you do have one, then this step isn't necessary.
2) I opened a stereo AIFF file in QTPlayer (I also used an MP4 file
and a WAV file too).
3) I did the commands "Select All", "Copy", and "Add To Movie".
4) I then opened the Movie Properties window and noted that where I
had one sound track, I now had two. (Under the hood, both sound tracks
refer to the same media on the disk too.)
5) I set the channel assignments for the two tracks to target the four
channels of my output device.
6) I hit play and enjoyed hearing the same audio coming out of two
entirely separate sets of speakers.
I'm pretty sure that you can accomplish all these steps
programmatically as well.
On Apr 8, 2008, at 5:10 AM, Dave Addey wrote:
There is currently no way for QuickTime to play one stereo movie to
two different pairs of outputs on a multi-channel audio device
whilst applying separate volume levels to the different channels.
(Radar feature request #4145662.)
--
Jeff Moore
Core Audio
Apple
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