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Hi Everyone,
http://fancyratstudios.com/2010/02/programming/cocos2d/fun-with-cocosdenshion-and-audio-metering/
It is possible to get the pitch values of the sound dynamically ? or any other way.?
Anyone have idea or tips ?
EDIT : I have tried to use
alGetSourcef(_sourceId, AL_PITCH, &pitchVal);
But it is always returns 1.0
Thanks,
Max
Steve Oldmeadow
Administrator
The metering demo is showing audio metering of an audio track played back using an AVAudioPlayer. You can not adjust the pitch of an AVAudioPlayer therefore the pitch is always going to be unchanged i.e. 1.0.
However, the code you posted is for OpenAL and has nothing to do with the metering example. The pitch of an OpenAL source would always be 1.0 (unchanged) unless you set it to something else.
Steve Oldmeadow
Administrator
No easy way.
noThree
Member
There are two ways I know of which you can use to find the pitch. The first is to count zero crossings per seconds which is not that accurate. The second is to use a Fast Fourier Transform which will give you the frequencies which make up a sound.
Like Steve said though neither way is very easy to implement.
Hummmm....Interesting.
Might be this future would be implemented on some Music App on iTune-Store,(May be). and it would be hard to implement but not impossible right ?
In Audacity and WavePad editor have such futures already,as well as i know in spectrum.
Well in this case i must be having my own player class instead of using AVAudioPlayer class from Apple.
I have tried to use other functions also from OpenAl but the all the function values are
constant for particular music file.
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