Re: panning with Audio Queue
Re: panning with Audio Queue
- Subject: Re: panning with Audio Queue
- From: William Stewart <email@hidden>
- Date: Mon, 26 Oct 2009 11:15:18 -0700
On Oct 24, 2009, at 2:25 PM, Matthew Pease wrote:
Hello -
I am using Audio Queue with File Streams to do streaming MP3s on
the iPhone. (using
What I'd like to add now is hard panning. The audio is one voice
in left channel, another in the right channel. What you get is
people talking over each other -- not good.
I tried just copying bytes in the stream from left-> right channel
(assuming interleaved bytes). But then I realized the data must be
encoded MP3s.
So then I looked at Audio Units -- the panning unit or the 3d mixer
looks promising. However, it is unclear to me: Is their an Audio
Unit chain that already exists where I could just modify the 3dMixer's
values? Or must I wire up my own Audio Unit graph and handle
writing bytes from the stream to it (replacing my AudioQueue code)?
Any tips on how to add panning to an http MP3 stream would be very
high appreciated!
AQ doesn't support panning of its audio. OpenAL is probably your best
approach I think - you can use ExtendedAudioFile to read the data and
decode to a linear PCM buffer, then you attach that to an OpenAL
source and pan that however you want.
You could also set up your own audio unit mixer, etc, but then you
have more work to do as you need to manage a read thread, etc.
Bill
Thank you!
Matt
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden