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-rw-r--r--src/devices/sound/ym2612.h87
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diff --git a/src/devices/sound/ym2612.h b/src/devices/sound/ym2612.h
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+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+
+#ifndef MAME_SOUND_YM2612_H
+#define MAME_SOUND_YM2612_H
+
+#pragma once
+
+#include "ymfm.h"
+
+
+// ======================> ym2612_device
+
+DECLARE_DEVICE_TYPE(YM2612, ym2612_device);
+
+class ym2612_device : public device_t, public device_sound_interface
+{
+public:
+ // constructor
+ ym2612_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type = YM2612);
+
+ // configuration helpers
+ auto irq_handler() { return m_opn.irq_handler(); }
+
+ // read/write access
+ u8 read(offs_t offset);
+ void write(offs_t offset, u8 data);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+ virtual void device_clock_changed() override;
+
+ // sound overrides
+ virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
+
+ // internal helpers
+ void sound_stream_update_common(write_stream_view &outl, write_stream_view &outr, bool discontinuity);
+
+ // internal state
+ ymopna_engine m_opn; // core OPN engine
+ sound_stream *m_stream; // sound stream
+ attotime m_busy_duration; // precomputed busy signal duration
+ u16 m_address; // address register
+ u16 m_dac_data; // 9-bit DAC data
+ u8 m_dac_enable; // DAC enabled?
+ u8 m_channel; // current multiplexed channel
+};
+
+
+// ======================> ym3438_device
+
+DECLARE_DEVICE_TYPE(YM3438, ym3438_device);
+
+class ym3438_device : public ym2612_device
+{
+public:
+ // constructor
+ ym3438_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // sound overrides
+ virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
+};
+
+
+// ======================> ymf276_device
+
+DECLARE_DEVICE_TYPE(YMF276, ymf276_device);
+
+class ymf276_device : public ym2612_device
+{
+public:
+ // constructor
+ ymf276_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_clock_changed() override;
+
+ // sound overrides
+ virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
+};
+
+
+#endif // MAME_SOUND_YM2612_H