[Speex-dev] Manual scratch allocation : memory usage doubt

[Jim Crichton]

Sameer,

I hope that you were able to resolve your problem, since you asked your 
question two months ago.  The MANUAL_ALLOC switch was only tested in 
narrowband mode for the c5x/c6x, so it would not be surprising if something 
were missing in wideband mode.

Regards,

Jim Crichton

----- Original Message ----- 
From: "Sameer Manchali" <sameerm at sanyo.co.in>
To: <speex-dev at xiph.org>
Sent: Saturday, February 20, 2010 4:31 AM
Subject: [Speex-dev] Manual scratch allocation : memory usage doubt


> Hi,
>
> I am currently encoding 32 Khz/Qual-10/UWB encode mode, with
> MANUAL_ALLOC enabled ( similar to the c5x/c6x configuration).
>
> In file sb_celp.c, I noticed the scratch memory grow during
> recursive (UWB -> WB) calls to 'sb_encode'.
>
> 1. 'stack' was not tracked (with 'tmp_stack' as done at other palaces)
>   after/before - auto-correlation/Levinson-Durbin scope (~line 597 -
> 621).
>
> 2. Similarly in the sub-frame encode loop (last major loop) after/before
> -
>   LSP-interpolation/weighted-signal-frm-synthesized-speech calculations
>   (~line 762 - 950).
>
> In <1>, the scope of the variable over after the braces, so I think that
> memory allocated on the scratch may not be needed further. Is it right?
>
> In <2>, I think the excitation, and other of one sub-frame will not be
> needed for the others. Is it ok?
>
> So, is it ok to do reuse the above scratch stack?
> This saves about 1.2 Kbyte of total scratch space required when running
> in UWB/Qual-10 mode.
>
> Regards
> Sameer
>
>
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