compression in lite?

Hdf-forum archives
1

Hi, Is compression possible / planned in the lite interface?
thanks and regards, D.S.

···

--
Dominik Szczerba, Ph.D.
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi

2

Hi Dominik

at this moment, compression is not featured with Lite. When we designed the Lite interface that feature was left out, because it was considered to be an "advanced" feature.

Lite is meant to be as simple as it gets on its use, just a few basic function calls to get a file and datasets or attributes up and running. Its functions are purely based on other basic library function calls.

The Lite interface is part of the High Level interface. Besides Lite the High Level interface has the Image, Table, Packet Table and Dimension Scales APIs. With these the goal is slightly different from Lite, it is to define a standard way to use Images, Tables and Dimension Scales, all considered high level abstractions for the basic use of the library.

http://www.hdfgroup.uiuc.edu/HDF5/doc_1.8pre/doc/RM/RM_H5Front.html

What sort of behavior would you like to see implemented in Lite regarding compression ?

As usual, we enter all requests and bugs in our database, and when there is enough momentum and /or financial support, we implement it.

Of course, you can use compression in your Lite program by combining it with some basic library functions. Probably you will want to define a property list, call your favorite compression function in it, and create a dataset with it using the basic functions.

Thanks

Pedro

Pedro Vicente Nunes

···

At 03:53 PM 1/4/2008, Dominik Szczerba wrote:

Hi, Is compression possible / planned in the lite interface?
thanks and regards, D.S.
--
Dominik Szczerba, Ph.D.
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi

--------------------------------------------------------------

HDF5 tools main developer
phone: (217)-265-0311
pvn@hdfgroup.org

----------------------------------------------------------------------
This mailing list is for HDF software users discussion.
To subscribe to this list, send a message to hdf-forum-subscribe@hdfgroup.org.
To unsubscribe, send a message to hdf-forum-unsubscribe@hdfgroup.org.

3

Hi Pedro,

It would be useful to add an optional parameter, int* chunk_size, to the end
of argument list of each write method. If null then no zlib compression is
applied (default), if not null then it is interpreted to contain chunk sizes
for the compressed storage (of the same rank as the dataset).

I have done something like it in my own C++ interface.

thank you and regards,
Dominik

>Hi, Is compression possible / planned in the lite interface?
>thanks and regards, D.S.
>--
>Dominik Szczerba, Ph.D.
>Computer Vision Lab CH-8092 Zurich
>http://www.vision.ee.ethz.ch/~domi

Hi Dominik

at this moment, compression is not featured with Lite. When we designed the
Lite interface that feature was left out, because it was considered to be
an "advanced" feature.

Lite is meant to be as simple as it gets on its use, just a few basic
function calls to get a file and datasets or attributes up and running. Its
functions are purely based on other basic library function calls.

The Lite interface is part of the High Level interface. Besides Lite the
High Level interface has the Image, Table, Packet Table and Dimension
Scales APIs. With these the goal is slightly different from Lite, it is to
define a standard way to use Images, Tables and Dimension Scales, all
considered high level abstractions for the basic use of the library.

http://www.hdfgroup.uiuc.edu/HDF5/doc_1.8pre/doc/RM/RM_H5Front.html

What sort of behavior would you like to see implemented in Lite regarding
compression ?

As usual, we enter all requests and bugs in our database, and when there is
enough momentum and /or financial support, we implement it.

Of course, you can use compression in your Lite program by combining it
with some basic library functions. Probably you will want to define a
property list, call your favorite compression function in it, and create a
dataset with it using the basic functions.

Thanks

Pedro

Pedro Vicente Nunes
--------------------------------------------------------------
http://hdfgroup.org/
HDF5 tools main developer
phone: (217)-265-0311
pvn@hdfgroup.org

----------------------------------------------------------------------
This mailing list is for HDF software users discussion.
To subscribe to this list, send a message to

hdf-forum-subscribe@hdfgroup.org.

···

On Monday 07 January 2008 17.00:38 Pedro Vicente Nunes wrote:

At 03:53 PM 1/4/2008, Dominik Szczerba wrote:
To unsubscribe, send a message to hdf-forum-unsubscribe@hdfgroup.org.

--
Dominik Szczerba, Ph.D.
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi

4

Thank you,
Dominik

>Hi Pedro,
>
>It would be useful to add an optional parameter, int* chunk_size, to the

end

>of argument list of each write method. If null then no zlib compression is
>applied (default), if not null then it is interpreted to contain chunk

sizes

>for the compressed storage (of the same rank as the dataset).
>
>I have done something like it in my own C++ interface.
>
>thank you and regards,
>Dominik

okay, I entered a bug report with this request
thanks
Pedro

> > >Hi, Is compression possible / planned in the lite interface?
> > >thanks and regards, D.S.
> > >--
> > >Dominik Szczerba, Ph.D.
> > >Computer Vision Lab CH-8092 Zurich
> > >http://www.vision.ee.ethz.ch/~domi
> >
> >
> > Hi Dominik
> >
> > at this moment, compression is not featured with Lite. When we designed
> the
> > Lite interface that feature was left out, because it was considered to

be

> > an "advanced" feature.
> >
> > Lite is meant to be as simple as it gets on its use, just a few basic
> > function calls to get a file and datasets or attributes up and running.
> Its
> > functions are purely based on other basic library function calls.
> >
> > The Lite interface is part of the High Level interface. Besides Lite the
> > High Level interface has the Image, Table, Packet Table and

Dimension

> > Scales APIs. With these the goal is slightly different from Lite, it is

to

> > define a standard way to use Images, Tables and Dimension Scales, all
> > considered high level abstractions for the basic use of the library.
> >
> > http://www.hdfgroup.uiuc.edu/HDF5/doc_1.8pre/doc/RM/RM_H5Front.html
> >
> > What sort of behavior would you like to see implemented in Lite

regarding

> > compression ?
> >
> > As usual, we enter all requests and bugs in our database, and when
> there is
> > enough momentum and /or financial support, we implement it.
> >
> > Of course, you can use compression in your Lite program by combining it
> > with some basic library functions. Probably you will want to define a
> > property list, call your favorite compression function in it, and
> create a
> > dataset with it using the basic functions.
> >
> > Thanks
> >
> > Pedro
> >
> >
> > Pedro Vicente Nunes
> > --------------------------------------------------------------
> > http://hdfgroup.org/
> > HDF5 tools main developer
> > phone: (217)-265-0311
> > pvn@hdfgroup.org
> >
> >
> > ----------------------------------------------------------------------
> > This mailing list is for HDF software users discussion.
> > To subscribe to this list, send a message to
>hdf-forum-subscribe@hdfgroup.org.
> > To unsubscribe, send a message to hdf-forum-unsubscribe@hdfgroup.org.
> >
>
>
>
>--
>Dominik Szczerba, Ph.D.
>Computer Vision Lab CH-8092 Zurich
>http://www.vision.ee.ethz.ch/~domi

Pedro Vicente Nunes
--------------------------------------------------------------
http://hdfgroup.org/
HDF5 tools main developer
phone: (217)-265-0311
pvn@hdfgroup.org

----------------------------------------------------------------------
This mailing list is for HDF software users discussion.
To subscribe to this list, send a message to

hdf-forum-subscribe@hdfgroup.org.

···

On Monday 07 January 2008 17.23:07 Pedro Vicente Nunes wrote:

At 10:17 AM 1/7/2008, Dominik Szczerba wrote:
>On Monday 07 January 2008 17.00:38 Pedro Vicente Nunes wrote:
> > At 03:53 PM 1/4/2008, Dominik Szczerba wrote:
To unsubscribe, send a message to hdf-forum-unsubscribe@hdfgroup.org.

--
Dominik Szczerba, Ph.D.
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi