[opus] Opus on MIPS performance

[Jean-Marc Valin]

Make sure you don't run as complexity 10, since it would run some float
ops even when compiled as fixed-point. If you don't have an FPU at all,
you want complexity 9 or lower.

	Jean-Marc

On 14/04/14 07:45 PM, Dean Blackketter wrote:
> Hi All,
> 
> First time poster to this group, please ignore my ignorance…
> 
> I’m trying to use Opus 1.1 on a 400MHz MIPS 24k CPU (AR9331, specifically, like in the Arduino Yun). 
> 
> I’ve successfully built (I think) opus-1.1 and opus-tools-1.8 and they run, but are dog slow.  
> 
> opus-1.1 does have the —enable-fixed-point option set, as this chip only has soft-float.  
> 
> My short test file (less than one second) encodes in 0.02 seconds on my Mac but takes 20+ seconds on this device.  
> 
> Anything obvious that I’ve missed or haven’t set up properly?
> 
> Thanks in advance,
> 
> Dean
> 
> Here it is in action:
> 
> root at ahoy6:/tmp# time opusenc /ahoy/sounds/whistle.wav whistle.opus
> Skipping chunk of type "LIST", length 46
> Encoding using libopus 1.1-fixed (audio)
> -----------------------------------------------------
>    Input: 44.1kHz 2 channels
>   Output: 2 channels (2 coupled)
>           20ms packets, 96kbit/sec VBR
>  Preskip: 356
> 
> Encoding complete                                                                          
> -----------------------------------------------------
>        Encoded: 0.74 seconds
>        Runtime: 25 seconds
>                 (0.0296x realtime)
>          Wrote: 10983 bytes, 37 packets, 3 pages
>        Bitrate: 108.746kbit/s (without overhead)
>  Instant rates: 76.8kbit/s to 182.8kbit/s
>                 (192 to 457 bytes per packet)
>       Overhead: 8.41% (container+metadata)
> 
> real	0m 25.06s
> user	0m 9.99s
> sys	0m 0.07s
> 
> and
> 
> root at ahoy6:/tmp# time opusdec whistle.opus - > /dev/null
> Decoding to 44100 Hz (2 channels)
> Encoded with libopus 1.1-fixed
> ENCODER=opusenc from opus-tools 0.1.8
> Decoding complete.        
> real	0m 26.39s
> user	0m 9.22s
> sys	0m 0.04s
> 
> 
> 
> 
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