Re: Echo cancellation and audio codec in coreaudio
Re: Echo cancellation and audio codec in coreaudio
- Subject: Re: Echo cancellation and audio codec in coreaudio
- From: William Stewart <email@hidden>
- Date: Fri, 31 Jul 2009 15:14:58 -0700
On Jul 31, 2009, at 2:24 AM, aruna nagaraj wrote:
I a newbie to MAC and working on a video client applicaiton. Please
help with the below questions:
1) Is it advisible to use sequencegrabber, QTkit or coreaudio
framework to capture voice data from microphone . Which of the above
API's is better for a video conferencing client ? My understanding is
that QTkit is better to attain lip synchronisation when the audio and
video capture source is from the same component .
you should look at the feature set of each API - the higher you go
(QTKit) the less code you have to write, but the less flexibility you
have. The lower you go (CoreAudio), the more flexibility you have, but
the more code you have to write
2) Is there any echo cancellation API that coreaudio/ Quicktime
provides that can be used for echo cancellation . I have searched the
Apple documentation and have found none so far .
not at this time
3) How do I use external audio codecs with Quicktime or coreaudio
frameworks ? Is it through new component creation for the codecs ? Or
can I in any way derive the Audiocodec component to include new audio
codec? Please provide links to some sample code .
for audio - audio formats are supported with the AudioCodec API. There
is an example audio codec in /Developer/Examples/CoreAudio
Bill
Thanks,
Aruna
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