[Speex-dev] Upsampling while decoding / Updating

Nikos Chantziaras realnc at gmail.com
Tue May 7 13:53:20 PDT 2013

The Opus resampler is actually a bugfixed version of the Speex one. Same 
interface/API, but with the bugs removed.  It's why I recommended it :-) 
  Otherwise I would have recommended something entirely different, like 

On 07/05/13 22:12, Hermann Weber wrote:
> Dear Nikos,
> thank you very much for your advice!
> I am not a little bit new to C++, and experiments (like using another
> third party library) always turn out to be days of work for me.
> That is why I would first like to try Speex's new internal resampling
> function.
> I am currently still using the old 1.0.4 version.
> I have now downloaded the new 1.2rc1 version.
> Unfortunately it does not want to compile the libspeex.dll right away,
> VS2010 tells me:
> Converting project file
> 'C:\Users\MyUser\Desktop\speex-1.2rc1\win32\VS2008\libspeex\libspeex.vcproj'.
> Failed to upgrade platform 'Windows Mobile 5.0 Pocket PC SDK (ARMV4I)'.
> Please make sure you have it installed under
> '%vctargetspath%\platforms\Windows Mobile 5.0 Pocket PC SDK (ARMV4I)'
> VCWebServiceProxyGeneratorTool is no longer supported. The tool has been
> removed from your project settings.
> Failed to upgrade 'Debug|Windows Mobile 5.0 Pocket PC SDK (ARMV4I)'.
> Please make sure you have the corresponding platform installed under
> '%vctargetspath%\platforms\Windows Mobile 5.0 Pocket PC SDK (ARMV4I)'
> The project configuration dimension name/value "(Platform, Win32)" was
> not found in the project manifest.
> Is it possible to compile the libspeex.dll without support for Windows
> Mobile 5.0, or is there no other way?
> I am afraid of messing anything up by install it.
> Greetings!
> Hermie
> Am 07.05.2013 16:03, schrieb Nikos Chantziaras:
>> On 07/05/13 13:07, Hermann Weber wrote:
>>> Hello!
>>> I would like to know if it is possible to request encoding to a higher
>>> samplerate than the original data.
>>> For example my uncompressed data was 22 kHz, and I would now like to
>>> decode the compressed data to 48 kHz (to feed it to a filter which
>>> expects a high "input" format).
>>> Is this possible with Speex?
>> Speex comes with a resampler, so yes. You need to resample your signal
>> after decoding it.
>> However, I'd recommend using the Opus resampler instead of the Speex
>> one.  (It can be used stand-alone and directly included in your own code.)
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