92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
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/*
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============================================================================
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Namco C140 sound emulator
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by cam900
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This file is licensed under zlib license.
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============================================================================
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zlib License
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(C) 2023-present cam900 and contributors
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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============================================================================
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TODO:
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- unknown registers (Bit 6 of control register, etc)
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- Internal timer
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*/
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#ifndef _C140_EMU_H
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#define _C140_EMU_H
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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struct c140_voice_t
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{
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bool busy; // busy flag
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bool keyon; // key on flag
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unsigned short freq; // sample frequency
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unsigned char bank; // sample bank
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unsigned short start_addr; // sample start address
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unsigned short loop_addr; // sample loop address
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unsigned short end_addr; // sample end address
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int lvol, rvol; // left/right volume
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bool compressed; // compressed sample flag
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bool loop; // loop flag
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unsigned short addr; // sample address
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int frac; // frequency counter (.16 fixed point)
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int lout, rout; // left/right output
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};
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struct c140_t
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{
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struct c140_voice_t voice[24];
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signed int lout, rout;
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signed short mulaw[256];
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unsigned short (*read_sample)(unsigned char bank, unsigned short addr);
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};
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void c140_tick(struct c140_t *c140, const int cycle);
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void c140_voice_tick(struct c140_t *c140, const unsigned char voice, const int cycle);
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void c140_keyon(struct c140_voice_t *c140_voice);
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void c140_write(struct c140_t *c140, const unsigned short addr, const unsigned char data);
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void c140_init(struct c140_t *c140);
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void c140_reset(struct c140_t *c140);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // _C140_EMU_H
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