New CA SDK Available
New CA SDK Available
- Subject: New CA SDK Available
- From: William Stewart <email@hidden>
- Date: Thu, 25 Mar 2004 11:42:26 -0800
http://developer.apple.com/audio
Core Audio SDK v1.3.1 Now Available
Core Audio SDK v1.3.1 features many new updates, including additional
Audio Unit APIs, playback and recording enhancements, additional sample
code, and much more. [Mar 24 2004]
This includes a number of additions to the Audio Unit API that we've
been working through with AU developers and host app companies since
panther shipped. Probably the two main features that are of general
interest are:
(1) A Completed API for translating Parameter values to and from Strings
(2) Definition of a new HostCallback type that includes information
about sample time, cycling, host transport state changed, etc. (In line
with this, there are also some helper methods in AUBase to make all of
the host callback information more accessible).
There is also the much discussed, how do a I read audio data using QT
API's into CoreAudio... We've certainly not done a complete
implementation of this, but there is enough there to read AAC data from
an m4a file. The rest is just filling in the missing formats.
There's also the new audio file play and record code that we've been
discussing.. Its implemented (of course:-) as C++ classes, but provides
a very powerful and I think simple interface to remove you from having
to know too much about the different formats, etc... The sample code to
read/write/convert files should be very helpful here. We also added
another piece to this puzzle which is an auconvert program... This uses
the CAAudioFile classes to read and write files, and between these it
uses a new wrapper class (CAAUProcessor) that provides a summation of
the basic methodology a host uses to use an AU to process audio. Based
on the reported latency and tail values of an AU, this code will
produce sample accurate processed files (and also wraps up support for
using Offline AU Types as well)
There's also some fixes to much loved apps like HAL Lab
Thanks
Bill
--
mailto:email@hidden
tel: +1 408 974 4056
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