Re: migration from soundconverter
Re: migration from soundconverter
- Subject: Re: migration from soundconverter
- From: William Stewart <email@hidden>
- Date: Wed, 6 Sep 2006 12:46:17 -0700
On 06/09/2006, at 1:02 AM, Sandeep Chandna wrote:
I am facing problems with SoundConveter API and have noticed that I
will have to change the code to use CoreAudio API in the latest SDK.
ok
I am working on a simple decoding/re-coding application.
ok - then have a look at the afconvert tool (or as a simple case, the
ConvertFile tool) in the CoreAudio examples:
/Developer/Examples/CoreAudio
These tools show you how to use the audio converter, set options on
it, etc...
QT's APIs are layered on top of the CA services - they are doing the
same kinds of things that are done in these examples (using the audio
converter, etc). QT provides its API for those developers who are
already doing alot of work using QT - typically working with more
than just one kind of media type, opening files as movies, etc.
I found some information in the QT 7.1 update guide (http://
developer.apple.com/documentation/QuickTime/Conceptual/
QT7UpdateGuide/Chapter02/chapter_2_section_6.html ) which talks
about the new Extraction APIs.
Can anyone help me with these? I am not clear if these
MovieAudioExtraction APIs. Are these the only functions that are to
be used?
From a QT perspective, yes. What I mean by that is that QT had other
APIs in the past for getting data out of movies, and this API is now
the recommended way that QT provides for extracting audio data from a
QT movie.
Bill
The scaudiocompress example (added on apple developer page
recently) opens a UI with SCRequestImageSettings function. If we
want to set these things without a UI then how can we do that? What
functions can we use to set the parameters of ComponentInstance
which SCRequestImageSettings sets internally?
The documentation is very limited and I am not well-versed with the
Quicktime also, so any pointers are welcome!!
Thanks
Sandeep
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