32 lines
890 B
C
32 lines
890 B
C
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// Commander X16 Emulator
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// Copyright (c) 2020 Frank van den Hoef
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// All rights reserved. License: 2-clause BSD
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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struct VERA_PCM {
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uint8_t fifo[4096 - 1]; // Actual hardware FIFO is 4kB, but you can only use 4095 bytes.
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unsigned fifo_wridx;
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unsigned fifo_rdidx;
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unsigned fifo_cnt;
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uint8_t ctrl;
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uint8_t rate;
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int16_t cur_l, cur_r;
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uint8_t phase;
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};
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void pcm_reset(struct VERA_PCM* pcm);
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void pcm_write_ctrl(struct VERA_PCM* pcm, uint8_t val);
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uint8_t pcm_read_ctrl(struct VERA_PCM* pcm);
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void pcm_write_rate(struct VERA_PCM* pcm, uint8_t val);
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uint8_t pcm_read_rate(struct VERA_PCM* pcm);
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void pcm_write_fifo(struct VERA_PCM* pcm, uint8_t val);
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void pcm_render(struct VERA_PCM* pcm, int16_t* buf_l, int16_t* buf_r, unsigned num_samples);
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bool pcm_is_fifo_almost_empty(struct VERA_PCM* pcm);
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