Fwd: [Openal] How can I play mono wav sound in specific channel?

[Ümit Uzun]

---------- Forwarded message ----------
From: Ümit Uzun <umituzun84 at gmail.com>
Date: 2009/4/16
Subject: Re: [Openal] How can I play mono wav sound in specific channel?
To: Chris Robinson <chris.kcat at gmail.com>


Hi Chris;

>
>
> ALshort monodata[samples];
>
> you can fill it into a 7.1 buffer like this:
>
> ALshort data71[samples*8];
> for(int i = 0;i < samples;i++) {
>    data71[i*8 + 0] = 0; // front-left
>    data71[i*8 + 1] = 0; // front-right
>    data71[i*8 + 2] = 0; // front-center
>    data71[i*8 + 3] = 0; // lfe (sub-woofer)
>    data71[i*8 + 4] = 0; // back-left
>    data71[i*8 + 5] = 0; // back-right
>    data71[i*8 + 6] = monodata[i]; // side-left
>    data71[i*8 + 7] = monodata[i]; // side-right
> }
> alBufferData(bID, alGetEnumValue("AL_FORMAT_71CHN16"), data71,
>             samples*8*sizeof(ALshort), frequency);
>
> I have look at the Framework and there is ALFWLoadWaveToBuffer;

ALboolean ALFWLoadWaveToBuffer(const char *szWaveFile, ALuint uiBufferID,
ALenum eXRAMBufferMode)
{
    WAVEID    WaveID;
    ALint     iDataSize, iFrequency;
    ALenum    eBufferFormat;
    ALchar    *pData;
    ALboolean bReturn;

    bReturn = AL_FALSE;
    if(g_pWaveLoader)
    {
        if(SUCCEEDED(g_pWaveLoader->LoadWaveFile(szWaveFile, &WaveID)))
        {
            if((SUCCEEDED(g_pWaveLoader->GetWaveSize(WaveID, (unsigned
long*)&iDataSize))) &&
               (SUCCEEDED(g_pWaveLoader->GetWaveData(WaveID,
(void**)&pData))) &&
               (SUCCEEDED(g_pWaveLoader->GetWaveFrequency(WaveID, (unsigned
long*)&iFrequency))) &&
               (SUCCEEDED(g_pWaveLoader->GetWaveALBufferFormat(WaveID,
&alGetEnumValue, (unsigned long*)&eBufferFormat))))
            {
                // Set XRAM Mode (ifapplication)
                if(eaxSetBufferMode && eXRAMBufferMode)
                {
                    eaxSetBufferMode(1, &uiBufferID, eXRAMBufferMode);
                }

                alGetError();
                alBufferData(uiBufferID, eBufferFormat, pData, iDataSize,
iFrequency);

                if(alGetError() == AL_NO_ERROR)
                {
                    bReturn = AL_TRUE;
                }

                g_pWaveLoader->DeleteWaveFile(WaveID);
            }
        }
    }

    return bReturn;
}

You have given ALshort monodata[samples]; but in this code ALchar *pData;
This variable are same or not. because alBufferData takes void format and
ALchar is 1 byte and ALshort 2 byte. I can't get what should I do.

And you have talk about samples. I have an iDataSize, How I get samples
size? I have open up the sound properties and in Summary tab there is Audio
Sample Size is 16 bit information. Should I divide iDataSize to 16 and then
get samples value?

Thanks for valueable informations.
Best wishes.

-- 
Ümit Uzun



-- 
Ümit Uzun
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