Re: Sound Level
Re: Sound Level
- Subject: Re: Sound Level
- From: Oleg Svirgstin <email@hidden>
- Date: Mon, 07 Apr 2003 23:44:36 +0300
Hi Lorenzo,
Hi all,
It is almost easy. Here is the recipe:
1. Use NSMovie to open and manipulate a sound file. I did not try it too
much, but seems it must directly operate with formats different from .mov
If it does not, there is a way to convert many formats to mov. (See
QuickTime references)
2. To open a sound file use "initWithURL:(NSURL*)url byReference:(BOOL)flag.
It is quite easy to turn a path into a URL, see NSURL in the manuals.
In the article about NSMovie you will find what this "byReference" means. By
the way, don't believe documentation: if you have to store a movie in an
archive, take care to make your NSMovie instance point to a real valid
"movie" file and to have that movie file at that path when you want to play
it back.
3. Sound control, play back rate and direction, copy/paste, adding extra
sound tracks, sound recording etc: that is all in QuickTime. By the way, it
is not so hard to get rudimentary basics of QuickTime, sufficient to learn
to play the sound back controlling its volume etc.
I finished writing my own xxSound. (What if these two letters that I use as
prefix for my classes will be considered as "secret information disclosure"
by my employee?).
I found that QuickTime is GREAT. It just works. (QuickTime itself: its Cocoa
wrappers are lame, though useful and quite useable)
However, to master it one must spend not hours, but months. :(
Probably, there will be a decent set of real QT wrappers in Cocoa one day, I
don't post a feature request or a bug report since there must be tons of
them on this subject already.
It is a great pleasure to reinvent a wheel, isn't it?
There may be some other ways using CoreAudio, but I did not get into it yet.
Just my 1/2 cent...
Best regards
Oleg
>
From: Lorenzo <email@hidden>
>
Date: Mon, 07 Apr 2003 14:46:46 +0200
>
To: <email@hidden>
>
Subject: Sound Level
>
>
Hi, how to control the sound level of the Mac, and
>
ho to control the sound level of my Cocoa application?
>
>
NSSound is not the answer. So please, what?
>
>
Best Regards
>
--
>
Lorenzo
>
email: email@hidden
>
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| References: | |
| | >Sound Level (From: Lorenzo <email@hidden>) |