Channel number, need 12 bit

This is a discussion on Channel number, need 12 bit within the C++ Programming forums, part of the General Programming Boards category; I'm using FMOD, and I am trying to retrieve the channel number that a sound is being played on. You ...

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    Banned frenchfry164's Avatar
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    Channel number, need 12 bit

    I'm using FMOD, and I am trying to retrieve the channel number that a sound is being played on. You find this by the return value of the function FSOUND_PlaySound(). The problem is, if I use an int it won't report the correct channel number, because the way the return value works. The first 12 bits is the channel number. I tried using a short int (which I think is 12 bit) and it doesn't work. I don't want to have to use a char, because that would limit me down to 256 channels, instead of 4096. Any ideas?

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    Senior Member joshdick's Avatar
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    Maybe a bitset with a specified number of bits?
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    Short ints are often 16 bits. Have you tried storing it in a short and then shifting 4 places to the right?
    Code:
    short i = FSOUND_PlaySound();
    i >>= 4;

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    Banned frenchfry164's Avatar
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    Now it keeps reporting channel 256. The only way I can get it to report the correct channel number is to use a char.

    It's not that important anyway, because I'll never use more than 256 channels at once (that's a lot of sound going on at once)

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    Re: Channel number, need 12 bit

    Originally posted by frenchfry164
    I'm using FMOD, and I am trying to retrieve the channel number that a sound is being played on. You find this by the return value of the function FSOUND_PlaySound(). The problem is, if I use an int it won't report the correct channel number, because the way the return value works. The first 12 bits is the channel number. I tried using a short int (which I think is 12 bit) and it doesn't work. I don't want to have to use a char, because that would limit me down to 256 channels, instead of 4096. Any ideas?
    The least significant 12 bits are the channel number? Just mask off the higher ones. E.g.:

    int channel = FSOUND_PlaySound(/*...*/) & 0x0FFF;

    This keeps the first 12 bits (bits 0-11) unchanged and zeros out all the higher order bits. (12-end).
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