[FFmpeg-soc] AAC TNS encoder

[Alex Converse]

On Sun, Jun 14, 2009 at 2:07 PM, Kostya<kostya.shishkov at gmail.com> wrote:
> On Sun, Jun 14, 2009 at 11:52:46AM -0400, Alex Converse wrote:
>> On Sat, Jun 13, 2009 at 12:26 AM, Kostya<kostya.shishkov at gmail.com> wrote:
>> > On Fri, Jun 12, 2009 at 05:25:36PM -0400, Alex Converse wrote:
>> >> On Fri, Jun 12, 2009 at 3:42 PM, Alex Converse<alex.converse at gmail.com> wrote:
>> >> > The following patchset adds TNS support to the AAC encoder.
>> >> >
>> >> > It's not 100% ready to be integrated.
>> >> >
>> >> > Patch 0 adds PARCOR code from Flake and doesn't have much to do with AAC.
>> >> > Patch 1 moves some AAC stuff around but doesn't ahev much to do with encoding.
>> >> > Patch 2 adds TNS support.
>> >> > Patch 3 adds a TNS coefficient compressor that shouldn't effect the
>> >> > output of the file after encoding and decoding but does for reasons
>> >> > taht stump me at the moment. Any help on this one would be greatly
>> >> > appreciated.
>> >> >
>> >>
>> >> The tables have been dealt with, here are cleaner versions of patches 1-3.
>> >
>> > looks ok (and how it sounds?)
>> >
>>
>> I'm not seeing much help nor much damage from it. If you have a sample
>> that suffers badly from preecho I'd be curious to see if it helps.
>> There are a few bugs I'd like to fix first before aggressively tuning
>> it.
>
> castanets? IIRC it was among the samples downloaded by script in aacenc/
>

Instead of precho what I'm seeing is most of the energy being sucked
out if the castanets. (both with and without TNS)

> And what bugs does encoder have? You have cured wobbly behaviour,
> haven't you?

The attached screenshot is one of the worst offenders. I also just
applied a band-aid fix for an illegal bitstream bug.

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