[Speex-dev] ARM7 decode resource requirements

[Anderton, John]

Hi Jean-Marc

Thanks,

>>>> I've never measured that, but it shouldn't take too much space,
especially if you disable all the code (and possibly codebooks) that aren't
used.

so the 100kbyte ROM value quoted by Tom in his earlier mail should reduce if
I cut out all the encoder code? 

Ta
John

-----Original Message-----
From: Jean-Marc Valin [mailto:Jean-Marc.Valin at USherbrooke.ca] 
Sent: 28 March 2006 23:11
To: Anderton, John
Cc: 'speex-dev at xiph.org'
Subject: Re: [Speex-dev] ARM7 decode resource requirements

> I'm looking in to using speex for an ARM7 based speech decode 
> development (note we need the decode only). My hope is that we should 
> be able to run the decoder (in wideband mode) real time on the ARM7
> (40MHz) without any problems (the difficulty would be in the encode - 
> but we plan to run that offline on a PC - so we should be OK). Can 
> anyone confirm that this is the case please?

I think decoding wideband shouldn't be a problem, even on a slow ARM7.
In the worst case, there are always some approximations possible (replacing
the long FIR filter by an IIR).

> Also I'd like to get a handle on memory requirements, has anyone got 
> any rough estimates of the ROM & RAM footprint of the decoder, built 
> for the ARM7?

I've never measured that, but it shouldn't take too much space, especially
if you disable all the code (and possibly codebooks) that aren't used.

> One last question, any estimates for how much of the decoder code is 
> in floating point (number of lines of code)?

There's probably in the order of 5-15 lines of floating-point code left,
most (all?) of which outside of loops. Should work in real-time even with
float emulation.

	Jean-Marc