[linux-audio-dev] Re: Looking for fast integer resampling code

Olivier Guilyardi ml at xung.org
Mon Jun 13 06:53:02 EDT 2005


David Cournapeau wrote:
> Olivier Guilyardi wrote:
>>
>> Then, I coded a trivial sample rate conversion routine by myself :
>> - it sounds good, I can't hear any difference with the SRC_LINEAR 
>> converter
> 
> I think the issue here is the application, and what you mean by good ? 
> If the usage is purely sampling rate convertion, as a final stage before 
> mastering, then linear interpolation sounds really bad, there is no 
> question about it. Now, if it is used inside a processing effect, it may 
> be enough (I remember having used a linear interpolation for time 
> stretching processing, and the linear interpolation was certainly not 
> the weak point in the processing chain).

Jackbeat is useful for my composition needs : for example I may need to use 16 
samples on 16 tracks. Linear conversion _really_ is good enough to hear what it 
sounds like, and my homemade converter is able to process 16 tracks on my 700Mhz 
Duron, performing realtime conversion.

Then I save the whole project (the sequence) and when loading it on some faster 
computer, I can switch to libsamplerate's SRC_SINC_FASTEST converter in one 
click. I would just have liked to think : ok libsamplerate can either do hi-fi 
or run very fast, according to the hardware I'm currently using. But that's not 
the case.

--
   og


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