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-rw-r--r--src/mame/audio/specimx_snd.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/src/mame/audio/specimx_snd.c b/src/mame/audio/specimx_snd.c
new file mode 100644
index 00000000000..2b56c6b25f8
--- /dev/null
+++ b/src/mame/audio/specimx_snd.c
@@ -0,0 +1,101 @@
+// license:BSD-3-Clause
+// copyright-holders:Miodrag Milanovic
+/***************************************************************************
+
+ audio/special.c
+
+ Functions to emulate sound hardware of Specialist MX
+ ( based on code of DAI interface )
+
+****************************************************************************/
+
+#include "specimx_snd.h"
+
+
+// device type definition
+const device_type SPECIMX_SND = &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_SND, "Specialist MX Audio Custom", tag, owner, clock, "specimx_sound", __FILE__),
+ 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++;
+ }
+}
+
+
+//-------------------------------------------------
+// PIT callbacks
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER(specimx_sound_device::set_input_ch0)
+{
+ m_mixer_channel->update();
+ m_specimx_input[0] = state;
+}
+
+WRITE_LINE_MEMBER(specimx_sound_device::set_input_ch1)
+{
+ m_mixer_channel->update();
+ m_specimx_input[1] = state;
+}
+
+WRITE_LINE_MEMBER(specimx_sound_device::set_input_ch2)
+{
+ m_mixer_channel->update();
+ m_specimx_input[2] = state;
+}