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How to calculate and implement the beats per minute, pitch and tempo of any .wav file and change its beats per minute to any other value which can decrease bpm or increase bpm using vc++,mfc

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Solution 1

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These are not fields or properties in a wave file.
A wave file simply contains a representation of a waveform over time.
What you're looking for, is information on waveform analysis. There are tools that will approximate some of the functions you're looking for. It's not an exact science, as music is very messy from an analysis point of view. It's extremely difficult for computers to process information, that our ears and brain seem to process relatively easily.
This is a topic that you could devote your entire life to.
But there you go, google 'Waveform Analysis'

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Solution 2

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About pitch and tempo, what Jack said was right, if by bpm you mean bits per minute, please check WAVEFORMATEX structure that a wave file contains.
http://msdn.microsoft.com/en-us/library/windows/desktop/dd390970%28v=vs.85%29.aspx[^]
Please check the following links too:
http://stackoverflow.com/questions/939904/changing-speed-of-a-sound-file[^]
http://social.msdn.microsoft.com/Forums/en-US/windowspro-audiodevelopment/thread/da25f8cc-30e1-4f78-aa28-e66597b85c62[^]

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Solution 3

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The simplest thing you can do is changing the sampling rate in the header of the file. The effect is like playing a tape/record at lower or higher speed.
Do not change bits per sample, that will result in garbage.
If you want to change effects independently, you'll have to do terrible maths. Sorry I do not find the publication where the algorithm is described anymore, some of the hits of Google when searching for "audio similarity algorithm" might help to get to the theory.
But an open source program which can do those effects might help you more: audacity http://audacity.sourceforge.net/[^]

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