Write IEEE float data to buffer
Write IEEE float data to buffer
- Subject: Write IEEE float data to buffer
- From: Hari Seldon <email@hidden>
- Date: Tue, 01 Aug 2006 13:49:42 -0400
I'm new to programming in xcode, but am really interested in working
on the mac. I'm trying to write audio data to a buffer for playback.
I normally work on a DirectSound model; where there is a manager that
creates a sound buffer, I write IEEE float data to the buffer and
directsound plays it. In that case it's up to me to allocate the
buffer, and ensure the correct lock/unlock model so that data is
written correctly.
I'm finding the documentation on CoreAudio a little harder to follow,
but the main idea I'm seeing is that (from DefaultOutputUnit example,
and others):
- I'd have to open the default audio unit and initialize it
- create a mixer (to mix multiple buffers for playback)
- get some sort of audio unit that represents a buffer
The only problem i've encountered from the examples I've seen so far
is that they all use a callback for writing data. Is it possible to
change the model and only write new audio data when I request it,
rather than being told when to write? I'm trying to match the
DirectSound model as much as I can. I realize there are workarounds I
can do (carry and internal queue of data to write when the callback
asks, etc), but I'd really prefer to match the models as much as
possible. Any suggestions?
Also from the examples I've seen, different channel audio are written
to different buffers. If I just have a single stream of decoded IEEE
wave data, is it possible to write this to a single buffer, where the
buffer knows how to separate the data for playback?
Hopefully these are fairly straightforward, and I can get the coding
models somewhat close.
Thanks
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