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// license:LGPL-2.1+
// copyright-holders:R. Belmont, Brad Martin
/*****************************************************************************
*
* Nintendo/Sony S-DSP emulation
*
****************************************************************************/
#ifndef MAME_SOUND_S_DSP_H
#define MAME_SOUND_S_DSP_H
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
class s_dsp_device : public device_t, public device_sound_interface, public device_memory_interface
{
public:
s_dsp_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
void set_volume(int volume);
u8 dsp_io_r(offs_t offset);
void dsp_io_w(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 stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
// device_memory_interface configuration
virtual space_config_vector memory_space_config() const override;
address_space_config m_data_config;
private:
memory_access<16, 0, 0, ENDIANNESS_LITTLE>::cache m_cache;
memory_access<16, 0, 0, ENDIANNESS_LITTLE>::specific m_data;
inline u8 read_byte(offs_t a) { return m_cache.read_byte(a); }
inline u16 read_word(offs_t a) { return read_byte(a) | (read_byte(a + 1) << 8); }
inline void write_byte(offs_t a, u8 d) { m_data.write_byte(a, d); }
inline void write_word(offs_t a, u16 d) { write_byte(a, d & 0xff); write_byte(a + 1, (d >> 8) & 0xff); }
enum class env_state_t32 : u8
{
ATTACK,
DECAY,
SUSTAIN,
RELEASE
};
struct voice_state_type /* Voice state type */
{
u16 mem_ptr; /* Sample data memory pointer */
int end; /* End or loop after block */
int envcnt; /* Counts to envelope update */
env_state_t32 envstate; /* Current envelope state */
int envx; /* Last env height (0-0x7FFF) */
int filter; /* Last header's filter */
int half; /* Active nybble of BRR */
int header_cnt; /* Bytes before new header (0-8)*/
int mixfrac; /* Fractional part of smpl pstn */
int on_cnt; /* Is it time to turn on yet? */
int pitch; /* Sample pitch (4096->32000Hz) */
int range; /* Last header's range */
u32 samp_id; /* Sample ID# */
int sampptr; /* Where in sampbuf we are */
s32 smp1; /* Last sample (for BRR filter) */
s32 smp2; /* Second-to-last sample decoded*/
s16 sampbuf[4]; /* Buffer for Gaussian interp */
};
inline u16 vptr(u8 sd, u8 v) { return read_word((sd << 8) + (m_dsp_regs[v + 4] << 2)); } /* Ptr to start of sample data */
inline u16 lptr(u8 sd, u8 v) { return read_word((sd << 8) + (m_dsp_regs[v + 4] << 2) + 2); } /* Loop pointer in sample data */
inline u16 pitch(u8 v) { return (m_dsp_regs[v + 2] | (m_dsp_regs[v + 3] << 8)) & 0x3fff; }
/* Make reading the ADSR code easier */
inline u8 SL(u8 v) { return m_dsp_regs[(v << 4) + 6] >> 5; } /* Returns SUSTAIN level */
inline u8 SR(u8 v) { return m_dsp_regs[(v << 4) + 6] & 0x1f; } /* Returns SUSTAIN rate */
void dsp_reset();
void dsp_update(s16 *sound_ptr);
int advance_envelope(int v);
void state_register();
// internal state
sound_stream *m_channel;
u8 m_dsp_addr;
u8 m_dsp_regs[256]; /* DSP registers */
int m_keyed_on;
int m_keys; /* 8-bits for 8 voices */
voice_state_type m_voice_state[8];
/* Noise stuff */
int m_noise_cnt;
int m_noise_lev;
/* These are for the FIR echo filter */
#ifndef NO_ECHO
s16 m_fir_lbuf[8];
s16 m_fir_rbuf[8];
int m_fir_ptr;
int m_echo_ptr;
#endif
};
DECLARE_DEVICE_TYPE(S_DSP, s_dsp_device)
#endif // MAME_SOUND_S_DSP_H
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