Speex dev - Aug 2004 - Encoding frame limit

When encoding many frames, I get a write access exception.  It appears
the "bits" structure has a fixed-size buffer (allocated in
speex_bits_init()), and speex-encode() pukes when it overruns it.

I understand I could just initialize bits with a bigger buffer, or watch
the buffer and stop encoding when it gets full.

But I don't want to care about compressed frame sizes, nor *can* I know
when VBR is enabled.

Is there any way to make speex_encode() automatically reallocate the
"bits" buffer if its too small?  Then it'd "just work"
without me caring
about the size of the internal bits buffer.

Alternatively, am I'm not supposed to encode many (>100) frames into a
single bits buffer?  The docs say to call speex_encode() multiple times,
and it doesn't specify a limit.  It works great for up to 53 frames, and
I see no reason why more shouldn't work fine.

So, am I doing something wrong, or is this a bug, or should the library
be enhanced to auto-resize the internal bits buffer (or at least return
a pretty error code) rather than blindly overwriting it?

Thanks!  Speex rox!

-david

Just have a look at the speex_bits_write_whole_bytes (or something like
that). That allows you to flush the "complete" bytes and continue
writing to the bits structure. As you guessed, just encoding without
flushing anything isn't a good idea.

Jean-Marc

On ven, 2004-07-30 at 14:20 -0600, David Barrett wrote:
> When encoding many frames, I get a write access exception.  It appears
> the "bits" structure has a fixed-size buffer (allocated in
> speex_bits_init()), and speex-encode() pukes when it overruns it.
>
> I understand I could just initialize bits with a bigger buffer, or watch
> the buffer and stop encoding when it gets full.
>
> But I don't want to care about compressed frame sizes, nor *can* I know
> when VBR is enabled.
>
> Is there any way to make speex_encode() automatically reallocate the
> "bits" buffer if its too small?  Then it'd "just
work" without me caring
> about the size of the internal bits buffer.
>
> Alternatively, am I'm not supposed to encode many (>100) frames into
a
> single bits buffer?  The docs say to call speex_encode() multiple times,
> and it doesn't specify a limit.  It works great for up to 53 frames,
and
> I see no reason why more shouldn't work fine.
>
> So, am I doing something wrong, or is this a bug, or should the library
> be enhanced to auto-resize the internal bits buffer (or at least return
> a pretty error code) rather than blindly overwriting it?
>
> Thanks!  Speex rox!
>
> -david
> _______________________________________________
> Speex-dev mailing list
> Speex-dev@xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev
>
--
Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca>
Universit? de Sherbrooke