hpux_audiodrv.cpp

Go to the documentation of this file.

//
// 1997/09/27 21:38:01
//

#include "audiodrv.h"

audioDriver::audioDriver()
{
        // Reset everything.
        errorString = "None";
        frequency = 0;
        channels = 0;
        encoding = 0;
        precision = 0;
        audioHd = (-1);
}

bool audioDriver::IsThere()
{
        // Check device availability and write permissions.
        return (access(AUDIODEVICE,W_OK)==0);
}

bool audioDriver::Open(udword inFreq, int inPrecision, int inChannels,
                                           int inFragments, int inFragBase)
{
        if ((audioHd=open(AUDIODEVICE,O_WRONLY,0)) == (-1))
    { 
                errorString = "AUDIO: Could not open audio device.";
                return false;
    }
        
        // Transfer input parameters to this object.
        // May later be replaced with driver defaults.
        frequency = inFreq;
        precision = inPrecision;
        channels = inChannels;
        
        int tmp_sampleSize;
        if (precision == SIDEMU_16BIT)
    {
                tmp_sampleSize = AUDIO_FORMAT_LINEAR16BIT;
                encoding = SIDEMU_SIGNED_PCM;
    }
        else  // if (precision == SIDEMU_8BIT)
    {
                //errorString = "AUDIO: 8-bit samples not supported.";
                //return false;
                precision = SIDEMU_16BIT;
                encoding = SIDEMU_SIGNED_PCM;
                tmp_sampleSize = AUDIO_FORMAT_LINEAR16BIT;
    }
        if (ioctl(audioHd,AUDIO_SET_DATA_FORMAT,tmp_sampleSize) == (-1))
    {
                errorString = "AUDIO: Could not set data format.";
                return false;
    }

        int tmp_stereo;
        if (channels == SIDEMU_STEREO)
                tmp_stereo = 2;
        else  // if (channels == SIDEMU_MONO)
                tmp_stereo = 1;
        if (ioctl(audioHd,AUDIO_SET_CHANNELS,tmp_stereo) == (-1))
    {
                errorString = "AUDIO: Could not set mono/stereo.";
                return false;
    }

        int tmp_speed = frequency;
        if (ioctl(audioHd,AUDIO_SET_SAMPLE_RATE,tmp_speed) == (-1))
    {
                errorString = "AUDIO: Could not set sample rate.";
                return false;
    }
        blockSize = 2*tmp_stereo*frequency;  // dump mode
        
    return true
}

// Close an opened audio device, free any allocated buffers and
// reset any variables that reflect the current state.
void audioDriver::Close()
{
        if (audioHd != (-1))
    {
                close(audioHd);
                audioHd = (-1);
    }
}

void audioDriver::Play(ubyte* pBuffer, int bufferSize)
{
        if (audioHd != (-1))
        {
                write(audioHd,pBuffer,bufferSize);
        }
}

---