Speex dev - Aug 2004 - What is the format of the PCM/WAV data for speex_encode & speex_decode?

I'm confused about the format of the PCM/WAV data for speex_encode &
speex_decode

    speex_encode(enc_state, input_frame, &bits); 

In the manual, it says "input_frame is a (float *) pointing to the
beginning
of a speech frame" (for encode)

But I've found that in speexenc.c and testenc.c, short* is used instead of
float*

 

So, isn't it signed 16 bit samples(if 16bit) or float?

For vorbis, I have to convert signed 16bit to float before encoding, how's
about speex?

 

 

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Kenji Chan wrote:
> I'm confused about the format of the PCM/WAV data for speex_encode
&
> speex_decode
>
>     speex_encode(enc_state, input_frame, &bits);
>
> In the manual, it says "input_frame is a (float *) pointing to the 
> beginning of a speech frame" (for encode)
>
> But I've found that in speexenc.c and testenc.c, short* is used 
> instead of float*
>
>  
>
> So, isn't it signed 16 bit samples(if 16bit) or float?
>
> For vorbis, I have to convert signed 16bit to float before encoding, 
> how's about speex?
>
>  
>
>  
>
It changed between speec 1.0 and 1.1.   1.1 (and CVS) uses short, but 
1.0 uses float.  I believe that the floats should be in the range of 
short (i.e -32k to 32k).

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Ok, I'm using 1.1.4, so I should pass signed short(wav data) directly to
speex_encode()?

But the samplecode that comes with 1.1.4 shows me to put short in float
array, and pass the float array to speex_encode()

<p>-----Original Message-----
From: owner-speex-dev@xiph.org [mailto:owner-speex-dev@xiph.org] On Behalf
Of Jean-Marc Valin
Sent: Saturday, April 17, 2004 6:25 AM
To: speex
Subject: Re: [speex-dev] What is the format of the PCM/WAV data
forspeex_encode & speex_decode?

Speex 1.0.3 uses floats, but the unstable version 1.1.x uses short.

        Jean-Marc

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Speex 1.0.3 uses floats, but the unstable version 1.1.x uses short.

        Jean-Marc

Le ven 16/04/2004  16:04, Kenji Chan a crit :
> Im confused about the format of the PCM/WAV data for speex_encode &
> speex_decode
> 
>     speex_encode(enc_state, input_frame, &bits); 
> 
> In the manual, it says input_frame is a (float *) pointing to the
> beginning of a speech frame (for encode)
> 
> But Ive found that in speexenc.c and testenc.c, short* is used
> instead of float*
> 
>  
> 
> So, isnt it signed 16 bit samples(if 16bit) or float?
> 
> For vorbis, I have to convert signed 16bit to float before encoding,
> hows about speex?
> 
>  
> 
>  
-- 
Jean-Marc Valin
http://www.xiph.org/~jm/
LABORIUS
Universit de Sherbrooke, Qubec, Canada


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