LibAOSoundDriver.cc

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#include "LibAOSoundDriver.hh"
#include "MSXException.hh"
#include <ao/ao.h>
#include <cstring>

namespace openmsx {

static const int BITS_PER_SAMPLE = 16;
static const int CHANNELS = 2;

LibAOSoundDriver::LibAOSoundDriver(unsigned sampleRate_, unsigned bufferSize_)
        : sampleRate(sampleRate_)
        , bufferSize(bufferSize_)
{
        ao_initialize();

        int driver = ao_default_driver_id();

        ao_sample_format format;
        memset(&format, 0, sizeof(format));
        format.bits = BITS_PER_SAMPLE;
        format.channels = CHANNELS;
        format.rate = sampleRate;
        format.byte_format = AO_FMT_NATIVE;

        device = ao_open_live(driver, &format, nullptr /* no options */);
        if (!device) {
                throw MSXException("Couldn't open audio device");
        }
}

LibAOSoundDriver::~LibAOSoundDriver()
{
        ao_close(device);
        ao_shutdown();
}

void LibAOSoundDriver::mute()
{
}

void LibAOSoundDriver::unmute()
{
}

unsigned LibAOSoundDriver::getFrequency() const
{
        return sampleRate;
}

unsigned LibAOSoundDriver::getSamples() const
{
        return bufferSize;
}

void LibAOSoundDriver::uploadBuffer(short* buffer, unsigned len)
{
        ao_play(device,
                reinterpret_cast<char*>(buffer),
                len * CHANNELS * (BITS_PER_SAMPLE / 8));
}

} // namespace openmsx