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: aruna nagaraj <email@hidden>
- Date: Mon, 3 Aug 2009 09:40:17 +0530
Hello Bill,
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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