// license:BSD-3-Clause // copyright-holders:Mirko Buffoni, James Wallace #pragma once #ifndef __OKIM6376_H__ #define __OKIM6376_H__ /* an interface for the OKIM6376 and similar chips (CPU interface only) */ /* struct describing a single playing ADPCM voice */ struct ADPCMVoice { UINT8 playing; /* 1 if we are actively playing */ UINT32 base_offset; /* pointer to the base memory location */ UINT32 sample; /* current sample number */ UINT32 count; /* total samples to play */ UINT32 volume; /* output volume */ INT32 signal; INT32 step; }; class okim6376_device : public device_t, public device_sound_interface { public: okim6376_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); ~okim6376_device() {} DECLARE_WRITE8_MEMBER( write ); DECLARE_WRITE_LINE_MEMBER( st_w ); DECLARE_WRITE_LINE_MEMBER( ch2_w ); DECLARE_READ_LINE_MEMBER( busy_r ); DECLARE_READ_LINE_MEMBER( nar_r ); void set_frequency(int frequency); protected: // device-level overrides virtual void device_config_complete() override; virtual void device_start() override; virtual void device_reset() override; // sound stream update overrides virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override; private: // internal state required_region_ptr m_region_base; /* pointer to the base of the region */ #define OKIM6376_VOICES 2 struct ADPCMVoice m_voice[OKIM6376_VOICES]; INT32 m_command[OKIM6376_VOICES]; INT32 m_latch; /* Command data is held before transferring to either channel */ UINT8 m_stage[OKIM6376_VOICES];/* If a sample is playing, flag that we have a command staged */ sound_stream *m_stream; /* which stream are we playing on? */ UINT32 m_master_clock; /* master clock frequency */ UINT8 m_divisor; /* can be 8,10,16, and is read out of ROM data */ UINT8 m_channel; UINT8 m_nar; /* Next Address Ready */ UINT8 m_nartimer; UINT8 m_busy; UINT8 m_ch2; /* 2CH pin - enables Channel 2 operation */ UINT8 m_st; /* STart */ UINT8 m_st_pulses; /* Keep track of attenuation */ UINT8 m_ch2_update; /* Pulse shape */ UINT8 m_st_update; void oki_process(int channel, int command); void generate_adpcm(struct ADPCMVoice *voice, INT16 *buffer, int samples,int channel); void postload(); void okim6376_state_save_register(); void adpcm_state_save_register(struct ADPCMVoice *voice, int index); }; extern const device_type OKIM6376; #endif /* __OKIM6376_H__ */