Resolved: Re: playing a pcm buffer
Resolved: Re: playing a pcm buffer
- Subject: Resolved: Re: playing a pcm buffer
- From: "Daniel Birns" <email@hidden>
- Date: Thu, 12 Oct 2006 10:02:18 -0700
Fellow audiofiles,
I figured out how to do it mathematically, and it's so easy that it's not
worth doing it any other way. It's also more portable since I don't have to
figure out the API on any other platform.
--Daniel
From: "Daniel Birns" <email@hidden>
To: email@hidden
Subject: Re: playing a pcm buffer
Date: Wed, 11 Oct 2006 19:33:51 -0700
This is now working well. There was a problem I should point out in the
kit, which was almost certainly written before the intel platform: The kit
doesn't work right on Intel out of the box. You have the remove the
big-endian flag:
streamFormat |= kLinearPCMFormatFlagIsBigEndian
That got the demo to play correctly. Almost certainly someone has noticed
this already...
Now I have 2 new questions:
1) Can I change the volume?
2) Can I play more than one sound simultaneously?
I know that I could do both of these things *mathematically*, by altering
the actual bits, but that's not what I'm looking for.
Thanks for your help. Without the guidance I got here, I might have been
lost for months.
--Daniel
From: Jeff Moore <email@hidden>
To: CoreAudio API <email@hidden>
Subject: Re: playing a pcm buffer
Date: Wed, 4 Oct 2006 18:04:50 -0700
There really isn't a mechanism on Mac OS X that works like you are used
to with wave out on Windows.
At any rate, for basic playback, you should check out the sample code in
/Developer/Examples/CoreAudio/SimpleSDK/DefaultOutputUnit
On Oct 4, 2006, at 5:53 PM, Daniel Birns wrote:
I need to play pcm buffers asynchronously.
I've spent way too much time looking for how to do this on my own. I
could use some help.
Our data will be 11k 8-bit mono.
On windows (for reference), we're doing this with waveOutPrepareHeader()
and waveOutWrite().
There's a callback we get when the buffer is played.
We need a similar mechanism for the mac.
--
Jeff Moore
Core Audio
Apple
_______________________________________________
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
_______________________________________________
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