[FFmpeg-devel] Masked LZ Decompression

Paul B Mahol onemda at gmail.com
Sun May 22 19:41:40 CEST 2016

On 5/22/16, Umair Khan <omerjerk at gmail.com> wrote:
> On Fri, May 20, 2016 at 11:53 PM, Paul B Mahol <onemda at gmail.com> wrote:
>> On 5/20/16, Umair Khan <omerjerk at gmail.com> wrote:
>>> Hi,
>>> I'm working on implementing floating point support in the ALS decoder.
>>> In this I've to use masked LZ decompression. I've written the code for
>>> myself for masked lz decompression using the help from the reference
>>> software.
>>> Although, I'm not yet sure if an implementation of masked LZ is
>>> already there in FFmpeg or not.
>>> If it is already there, it makes no sense to have my own implementation
>>> as
>>> well.
>>> So anybody has any idea if we have masked LZ implementation already or
>>> not ?
>> IMHO we do not. Because its audio related.
> Hi Paul,
> Any idea about this https://ffmpeg.org/doxygen/2.8/lzw_8c.html ?
> This looks like the encoder part -
> https://ffmpeg.org/doxygen/2.8/lzwenc_8c.html

Different thing, you can look at code.

> I'm not sure how masked LZ is different from LZW. There's almost zero
> information available on internet about masked lz.
> Also, there's a research paper available here -
> http://www.aes.org/e-lib/browse.cfm?elib=13068
> Any way if we can get this ?

No need to get it if there is already code for it.

When you will finally send patch?

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