I work on virtual music instrument ( uvi.net ) and we store all the
samples in FLAC format because of its compression level, its lossless
capability and
its decoding speed. This is clearly the best in the world and we love
it. We have a streaming engine tailored to its use.
In the case of a piano library, we open around 10.000 files at loading
time to read hundred of ms of it the file beginning as preload to avoid
latency when the user start playing.
Then depending on what the users play, we could read around 400 files at
the same time and even more in our new engine where we could up to 2000
files where we multi thread the audio rendering.
Hence even small optimization are very welcomed :)
I don't mind losing the 32bits x86 optimization are we don't have users
on 32 bits Intel platform.
I wouldn't even mind paying someone for better optimization in neon for
example.
Hope this clarify things.
Le 06/07/2022 à 20:36, Martijn van Beurden a écrit :
Olivier,
On a more general note, do you experience the decoding speed of
libFLAC as a bottleneck in your application? Decoding speed of FLAC is
already best-in-class among lossless audio codecs, so I actually
wasn't expecting anyone to object to a (small) decrease in decoding
speed. There have been more changes recently that could (slightly)
affect decoding speed, but for good reasons. I am aware that the
following changes affect decoding speed
-
https://github.com/xiph/flac/commit/1bec35e33757fc38261b0acfa3c032e720d2baf0
-
https://github.com/xiph/flac/commit/63ac1c37bebbda5ca61ad5a05a1d8fba2883f629
Comparing current git to release 1.3.4 for my 64-bit x86 machine this
adds up to about 4% slowdown for both 16-bit and 24-bit audio. When
using a 32-bit compile, for 16-bit audio this cancels out against the
speed gain from the removal of optimizations and for 24-bit audio this
compounds to about 10% speed loss. Numbers may vary depending on the
CPU specifics. I didn't think this would be a problem, but please
speak up (and if possible elaborate on the details) if it is.
--
Olivier Tristan
Research & Development
www.uvi.net
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