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how to speed up or slow down playback audio file in flash while maintaining pitch (timestretching)

Posted on 2011-02-28
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Last Modified: 2012-05-11
Hi,

I am looking for some tutorial, tips or even find out if it is possible to do the following in flash or action script.

I like to create a flash application that allows me to playback an audio file at various speed while maintaining the audio pitch; his is also known as timestretching. The audio file is basically a music rhythm and it could be a wave file or MP3 file or any other file format for that matter. User needs to be able to playback that file through the flash swf file and be able slow down and speed up the audio file using a dial or buttons without changing the audio pitch.There are commercial softwares that do that. Here is an example of it:

http://www.surina.net/pacemaker/

The question I have is if it is possible to implement something like this using flash and action script.

Thanks for any advice/tip/tutorials/documentation on this.
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Question by:dmehran
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quizengine earned 2000 total points
ID: 35004555
Someone appears to have worked it out - http://audiostretch.com/ maybe they will share / licence the code ?
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by:quizengine
quizengine earned 2000 total points
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by:dmehran
ID: 35041243
quizengine, thanks for the solutions. I split the point between your answers since both of them were useful. Although the send link crashed my browser a couple of time, yet the tutorial  that came with it gave me some good ideas.

Thanks,
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The goal of the tutorial is to teach the user how to select the video input device. Make sure you have an input device that in connected and work and recognized by Adobe Flash Media Live Encoder and select it in the “video input” menu.
The goal of the tutorial is to teach the user how to select which audio input to use. Once you have an audio input plugged into the laptop or computer, you will go into the audio input settings and choose which audio input you want to use.

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