I just did a comparison of audio codec decode times with libav-11 on a
iMX-53 (arm cortex-A8) with and without neon & vfp optimizations. There
was substantial improvements in aac, ogg and wma with neon & vfp
enabled, but mp3 remained the same. Am I correct to assume the mp3
decoder does not utilize the neon optimizations? (or is something
screwed up) alac and flac also had little improvement but I understand
that they are very different in that they don't convert to the frequency
domain.
Tables
Decode Time (s)
codec libav libav no neon incumbent % change compared against
aac 9.7 59.5 40.6 −76.1% faad
alac 8.1 8.1 6.5 24.6% faad
flac 10.9 11.6 11.2 −2.7% flac
ogg 9.9 47.7 35.5 −72.1% ogg123
mp3 19.2 19.2 8.5 125.9% madplay
wmav2 5.7 38.7 4.8 18.8% gst-wma-codec
(codec to codec is different content.)
--
Jonathan Bagg
Embedded Systems Developer
NAD Electronics | Lenbrook Industries Limited
633 Granite Court, Pickering, Ontario, Canada L1W 3K1 | 905-831-0799 ext 4478
|http://www.nadelectronics.com
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