Re: How to route the sound to the specific channel e.g. LFE

On Tuesday, November 16, 2010 3:42:10 pm Andrzej Artymowicz wrote:
> I'm curious is it possible to route the sound to the specific channel e.g.
> LFE?

Hi.

The most compatible way would be to create a 5.1 buffer (using 
AL_EXT_MCFORMATS), and leave all the channels silent except for the LFE, which 
would be filled with your data:

void BufferLFE(ALuint bid, ALshort *data, ALsizei bytes, ALsizei freq)
{
    std::vector<ALshort> alldata(bytes/sizeof(ALshort)*6);
    for(size_t i = 0;i < alldata.size();i+=6)
    {
        alldata[i  ] = 0; // front-left
        alldata[i+1] = 0; // front-right
        alldata[i+2] = 0; // center
        alldata[i+3] = data[i/6]; // lfe
        alldata[i+4] = 0; // back-left
        alldata[i+5] = 0; // back-right
    }
    alBufferData(bid, AL_FORMAT_51CHN16, &alldata[0], alldata.size() *
                                                      sizeof(ALshort), freq);
}

There is also the ALC_EXT_DEDICATED extension 
<http://icculus.org/alextreg/index.php?operation=op_showext&extname=ALC_EXT_DEDICATED>
although that is only available in the Rapture3D driver, AFAIK.
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