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/***************************************************************************
audio/special.c
Functions to emulate sound hardware of Specialist MX
( based on code of DAI interface )
****************************************************************************/
#include "includes/special.h"
// device type definition
const device_type SPECIMX = &device_creator<specimx_sound_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// specimx_sound_device - constructor
//-------------------------------------------------
specimx_sound_device::specimx_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, SPECIMX, "Specialist MX Custom", tag, owner, clock),
device_sound_interface(mconfig, *this),
m_mixer_channel(NULL)
{
memset(m_specimx_input, 0, sizeof(int)*3);
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void specimx_sound_device::device_start()
{
m_specimx_input[0] = m_specimx_input[1] = m_specimx_input[2] = 0;
m_mixer_channel = stream_alloc(0, 1, machine().sample_rate());
}
//-------------------------------------------------
// sound_stream_update - handle a stream update
//-------------------------------------------------
void specimx_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
INT16 channel_0_signal;
INT16 channel_1_signal;
INT16 channel_2_signal;
stream_sample_t *sample_left = outputs[0];
channel_0_signal = m_specimx_input[0] ? 3000 : -3000;
channel_1_signal = m_specimx_input[1] ? 3000 : -3000;
channel_2_signal = m_specimx_input[2] ? 3000 : -3000;
while (samples--)
{
*sample_left = 0;
/* music channel 0 */
*sample_left += channel_0_signal;
/* music channel 1 */
*sample_left += channel_1_signal;
/* music channel 2 */
*sample_left += channel_2_signal;
sample_left++;
}
}
void specimx_sound_device::set_input(int index, int state)
{
if (m_mixer_channel!=NULL)
{
m_mixer_channel->update();
}
m_specimx_input[index] = state;
}
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