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: Mon, 3 Aug 2009 15:35:08 -0700
With regards to ITU G.711 spec. The segment breakpoints are identical.
Since we convert from 16 bit to mu-law, instead of from 14 bit as in
the spec, there may be some LSB differences due to rounding in
relation to what others may be doing.
Thanks a lot for the response.
Please help me with one more query .
1) Is the A law and Mu law conversion of the audioconverter
API is
complaint with G.711 A Law and Mu Law ? Can this be decoded by
any
other G.711 Alaw Mu law audio codecs ?
Regards,
Aruna
On Sat, Aug 1, 2009 at 3:44 AM, William
Stewart<email@hidden> wrote:
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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