[FFmpeg-devel] [PATCH/RFC] Add some dsputil functions useful for AAC decoder

Måns Rullgård mans
Sat Sep 19 19:31:34 CEST 2009

Alex Converse <alex.converse at gmail.com> writes:

> On Fri, Sep 18, 2009 at 6:11 PM, Mans Rullgard <mans at mansr.com> wrote:
>> This patch adds a few dsputil functions that can be used in the AAC
>> decoder.
>> With trivial NEON versions of these functions, the AAC decoder gets
>> ~1.6x faster on Cortex-A8, and better NEON code will push that even
>> further.
> On what sort of sample material? I ask this because it looks like a
> few of these functions are for channel coupling which is rarely seen
> in the wild.

Some random AAC file I had.  The metadata mentioned itunes.

All of the functions do get called, although some not very often.

M?ns Rullg?rd
mans at mansr.com

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