[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

Compressing Streams

Posted on 1999-01-08
8
Medium Priority
?
316 Views
Last Modified: 2010-04-06
Hi,

I saved the contents of a WAV file in a TMemoryStream.  I need to send this stream via tcp/ip, but it's too big!

Is there any way to compress the stream and decompress it once it gets to the client?

Thanx,

Nadia!
0
Comment
Question by:peimbert
8 Comments
 

Author Comment

by:peimbert
ID: 1355455
Edited text of question
0
 
LVL 20

Expert Comment

by:Madshi
ID: 1355456
Hmmm. Compressing wav files is difficult (look at http://www.experts-exchange.com/Q.10114383 for this theme, the question is still open).
How about splitting the wav file into several packets?

Regards, Madshi.
0
 

Expert Comment

by:qdyoung
ID: 1355457
As what was discussed in Q.10114383, binary compressors provide only about 15% compression. But if you think that it suits your need. Than it's easy. Delphi3 already provide ZLib.pas. ZLIB came with Delphi 3.0 professional, located in the "extras" directory on the CD. You can visit http://www.radix.net/~bziegler/Delphi/Source.html and download remotecontrol.zip for a good example of how to compress TMemoryStream using the ZLib functions. This example compresses bitmap then send the stream via TCP/IP.

Regards, Young.
0
Receive 1:1 tech help

Solve your biggest tech problems alongside global tech experts with 1:1 help.

 
LVL 7

Expert Comment

by:jconde
ID: 1355458
Uh..hmm, 15% doesn't seem much, especially when talking about transmitting "Many" streams through the net.


0
 

Expert Comment

by:jpdupont
ID: 1355459
I use TLZRW1 component with memory/file streams.
The component had an option "uses streams".
Compression is very good (like zip files).
==
TLZRW1 file compression component.
Visual feedback on a Panel if so desired.
VCL code by D. Heijl
==
See on DSP/Torry.
Create the component at run time and set visible:=false  because
this is a visual component - panel descendant.

Jean-Pol
0
 

Author Comment

by:peimbert
ID: 1355460
Your answer is not that bad, but when you want to transmit in a NRT manner, 15% is not that good !!!

I tried using ZLib as you stated, as well as the component proposed by  jpdupont and jpdupont's answer is much better....The compression rate is very good (almost as ZIP format) and the quality mantains (Human ear can detect from 20Hz to 20,000Hz) and only variation occurred beyond the 50,000 Hz.

Thank you very much anyway.
0
 

Author Comment

by:peimbert
ID: 1355461
jpdupont, Since your answer was the best, please post an answer.

Regards,

Nadia
0
 

Accepted Solution

by:
jpdupont earned 400 total points
ID: 1355462
Try the TLZRW1 component.
See comment :

"I use TLZRW1 component with memory/file streams.
The component had an option "uses streams".
Compression is very good (like zip files).
==
TLZRW1 file compression component.
Visual feedback on a Panel if so desired.
VCL code by D. Heijl
==
See on DSP/Torry.
Create the component at run time and set visible:=false  because
this is a visual component - panel descendant."

Jean-Pol

0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
SQL Database Recovery Software repairs the MDF & NDF Files, corrupted due to hardware related issues or software related errors. Provides preview of recovered database objects and allows saving in either MSSQL, CSV, HTML or XLS format. Ensures recov…
There may be issues when you are trying to access Outlook or send & receive emails or due to Outlook crash which leads to corrupt or damaged PST file. To eliminate the corruption from your PST file, you need to repair the corrupt Outlook PST file. U…
Suggested Courses
Course of the Month9 days, 3 hours left to enroll

590 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question