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Mac Forum / Programming / Mac Programming / February 2007creating sounds (tones) programatically
i THINK that's the proper word... what has bothered me ever since mac os 7 is the following question. if i wanted to hand code the different sound element levels for a particular sound or tone, how would i get this array of sound level numbers into a sound file the machine can play? just speaking hypothetically, if i wanted to create an array as such: double cycle[360]; int i; for (i = 0; i < 360; i++) { cycle[i] = sin((i / 360.0) * 6.28); // yeah, i know, not really two times pi but good enough as an example } how would i get the cycle into a NSSound I can either write to a file or play through NSSound's play? > i THINK that's the proper word... > [quoted text clipped - 16 lines] > how would i get the cycle into a NSSound I can either write to a file or > play through NSSound's play? by the way, i DO know that the data needs to be converted somehow to some form of integer (most likely 8 or 16 bits) either signed or unsigned with 128 as zero point (8 bit) or 32768 as zero point (16 bit). what i need to know is where would i go to find this information or somebody simply tell me the information. what coding does it use (linear, logarithmic, mu-law, a-law, etc), what's the zero point, how many bits, does it require dual channel or can one use a single channel? from all this information i can create the data array of numbers. i then need to know how it's supposed to be played using existing (not on it's way out) routines. >> i THINK that's the proper word... >> [quoted text clipped - 28 lines] > then need to know how it's supposed to be played using existing (not on > it's way out) routines. That kind of stuff is now being handled in MacOS X by something called Core Audio. There's plenty of built-in libraries and frameworks to handle the issues: http://www.apple.com/macosx/features/coreaudio/ >>> i THINK that's the proper word... >>> [quoted text clipped - 34 lines] > > http://www.apple.com/macosx/features/coreaudio/ http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.2c.htm #pgfId=4097 |
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