[FFmpeg-devel] Masked LZ Decompression

Umair Khan omerjerk at gmail.com
Sun May 22 20:11:53 CEST 2016

On Sun, May 22, 2016 at 11:11 PM, Paul B Mahol <onemda at gmail.com> wrote:
> 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?

I fixed the error which I was having in which the output of channel 0
was not correct.
I still have some features which are not working properly. I plan to
send the patch before Friday.


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