[mad-user] mad decoder sample rates

[Steve Spano]

Hi Rob,

Great - thanks! I see the call, something like set sample rate. It just
goes to a debug trace and I see it decoding a file at 22050. So we will
hook that into the silicon oscillator setup.

We are also going to run MAD on the Xilinx Microblaze later this month
as well.

I have another issue with compiling with the FPM_ARM; but I am working
on resolving that. Right now I am using FPM_DEFAULT.

So I may ask a few other questions. For the STR912 implementation, we
actually want to run two instances of MAD, in mono mode, and then have
one MP3 goto the left channel and the other the right; assuming the
sample rates match.

It doesn't look like MAD performs on the fly resampling; which is fine.
We may add it later.

Thanks

Steve Spano
FLE


-----Original Message-----
From: mad-user-bounces at lists.mars.org
[mailto:mad-user-bounces at lists.mars.org] On Behalf Of Rob Leslie
Sent: Friday, September 07, 2007 1:14 PM
To: mad-user at lists.mars.org
Subject: Re: [mad-user] mad decoder sample rates

On Sep 7, 2007, at 9:57 AM, Steve Spano wrote:
> I want to be able to run 8Khz to 48KHz MP3s. Is there anything in  
> the mad decoder that would prevent decoding MP3s within this range?  
> We don't have a sample issue with our hardware since we can set any  
> sample rate we want.

MAD supports all MPEG audio sampling frequencies, namely  
8000/11025/12000 (MPEG 2.5), 16000/22050/24000 (MPEG-2 LSF), and  
32000/44100/48000 (MPEG-1) Hz.

Keep in mind the bitstream determines the sample rate you get from  
MAD. If you want to output PCM at some other rate, you'll have to  
resample it first.

-- 
Rob Leslie
rob at mars.org