Re: [Dev-C++] New to the list, and a quick question

Aloha from honolulu,
    If you use a .wav file this is usually uncompressed audio.  There 
are several compressed audio formats .mp3, .m4a, etc.  Microsoft and 
Apple each have their own formats that Windows Media Player and iTunes 
use.  I'm not sure about Unix/Linux, but the point is audio compression 
formats exist and deliver reasonable results.  Don't try to compress a 
.wav file into a .zip and expect to enjoy the listening experience. 
(Although that isn't based on my experience--I've never tried it.)
    In professional recording the trend now is to record the tracks at 
the higest resolution, now 24-bit/196KHz sample rate.  Then mix to 
stereo file (at same res) then downsample to meet spec for various 
formats.  Audio DVDs are 24-bit/96KHz and CDs are 16-bit/44.1KHz.  Audio 
for video is usually 16-bit/48KHz.  Note that none of this is 
compressed, it is just using less of the original information.
    MP3 (MPEG-1 Audio Layer 3) on the other hand is defined as a lossy 
compression format where "inaudible" data is removed from the audio 
file.  Look up "MP3" in Wikipedia http://en.wikipedia.org/wiki/MP3 the 
article has information on the various formats in use today.
    The compression ratios are quite impressive, but you must choose 
what type of compression you use, based on the audio material involved. 
  Speech can be compressed the most.  Loud, hard rock and roll music can 
handle a lot of compression.  Delicate classical music with large 
dynamic range will suffer the most from compression.  If you have the 
time and tools, run the audio through an oscilloscope and compare 
uncompressed to compressed.
    Hope this is helpful.
Aloha,
Roger Furer

Per Westermark wrote:

> Note that sound is very hard to compress, and for most applications it
> isn't meaningful to spend any time to compress/decompress it.
> 
> The only situations where compression is important is when used in flash
> memory of small hand-held devices, or if transmitted over a
> bandwidth-limited media, such as using a GPRS phone.
> 
> Cmpiling audio or images into an application is quite often done, and
> works very well. By having the information in the exe file - or even
> better in one or more dll files - the OS will be able to throw away the
> information in case of a mermory contention. If the information is read in
> from a data file (read in, instead of memory-mapped), the OS must swap out
> the information so that it can restore the information later without
> letting the application know about it. Information stored in resource
> files, the exe file or a dll file does not need to be swapped, since the
> OS specifically knows how to load the information on demand directly
> from the original source.
> 
> /Per W
> 
> On Thu, 11 Jan 2007, Pedro Perez wrote:
> 
> 
>>Hello;
>>
>>   Is not advisable to include a complete audio file in your program, maybe if is a small file you can include it as a resource file.
>>
>>   I think the best you can do  is to pack it in a file in some format you desire (*.dat), unpack it and use it as desire. (Tip: You can apply a compress format leaving the .dat extension and then encrypt it, that helps too).
>>
>>
>>
>>____________________________________________________________________________________
>>Any questions? Get answers on any topic at www.Answers.yahoo.com.  Try it now.
>>
>>-------------------------------------------------------------------------
>>Take Surveys. Earn Cash. Influence the Future of IT
>>Join SourceForge.net's Techsay panel and you'll get the chance to share your
>>opinions on IT & business topics through brief surveys - and earn cash
>>http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
>>_______________________________________________
>>Dev-cpp-users mailing list
>>Dev...@li...
>>TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
>>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>>
> 
> 
> 
> -------------------------------------------------------------------------
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to share your
> opinions on IT & business topics through brief surveys - and earn cash
> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>