Speex dev - May 2006 - Size of each block in a circular buffer and the sample rate

int frameSize;
speex_encoder_ctl(enc_state, SPEEX_GET_FRAME_SIZE, &frameSize);

Is frameSize in bytes?  If not, what unit is it in?  I need to know so I 
know how big to make each element in my circular buffer.

Also, do I need to call

speex_encoder_ctl( enc_state, SPEEX_SET_SAMPLING_RATE, &sampleRate );

Depending on sample rate I record my audio in?  If not, is there any 
benefit to setting the sample rate, such as reduced bandwidth?

> Is frameSize in bytes?  If not, what unit is it in?  I need to know so I 
> know how big to make each element in my circular buffer.
It's in samples, regardless of whether you use floats or shorts.
> Also, do I need to call
> 
> speex_encoder_ctl( enc_state, SPEEX_SET_SAMPLING_RATE, &sampleRate );
> 
> Depending on sample rate I record my audio in?  If not, is there any 
> benefit to setting the sample rate, such as reduced bandwidth?
The only thing Speex does with the sampling rate is compute the final
bit-rate it corresponds to. If you use a "nominal" bit-rate (8 kHz for
narrowband, 16 kHz for wideband, ...), which I strongly recommend, you
don't even need to call this.

	Jean-Marc

Thanks!  I hope this isn't a stupid question but if I want to play two 
or more voices at the same time, I just add the values of the samples 
right?  If I'm using an unsigned short, should I then clamp the values 
to 65535?

Jean-Marc Valin wrote:
>> Is frameSize in bytes?  If not, what unit is it in?  I need to know so
I
>> know how big to make each element in my circular buffer.
> 
> It's in samples, regardless of whether you use floats or shorts.
> 
>> Also, do I need to call
>>
>> speex_encoder_ctl( enc_state, SPEEX_SET_SAMPLING_RATE, &sampleRate
);
>>
>> Depending on sample rate I record my audio in?  If not, is there any 
>> benefit to setting the sample rate, such as reduced bandwidth?
> 
> The only thing Speex does with the sampling rate is compute the final
> bit-rate it corresponds to. If you use a "nominal" bit-rate (8
kHz for
> narrowband, 16 kHz for wideband, ...), which I strongly recommend, you
> don't even need to call this.
> 
> 	Jean-Marc
> 
>