HydrogenAudio

Hydrogenaudio Forum => Uploads => Topic started by: swathijakkam on 2013-01-10 07:14:18

Title: AAC frequency
Post by: swathijakkam on 2013-01-10 07:14:18
Hi,

I implemented RTSP streaming protocol for music streaming.

From SDP protocol i got below value for RTPMAP field.

Media Attribute (a): rtpmap:96 MP4A-LATM/22050/1



From RTPMAP field information, received data type is AAC with frquency 22050.


If i try to play the received RTP data with this frequency song clarity is not good.

I tried to play with different AAC frequencies (frequency values are taken from
"ISO/IEC 13818-7 (AAC)" document). Finally with 64000 frequency is giving good clarity.

How to calculate the frequency for AAc data from RTP streams?

What is default frequency for AAc data?

Thanks in advance.

Regards,

swathi jakkam.
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