31 lines
829 B
C
31 lines
829 B
C
/*
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Copyright (c) 2021 Devine Lu Linvega
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Copyright (c) 2021 Andrew Alderwick
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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typedef signed int Sint32;
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#define SAMPLE_FREQUENCY 44100
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#define POLYPHONY 4
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typedef struct {
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Uint8 *addr;
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Uint32 count, advance, period, age, a, d, s, r;
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Uint16 i, len;
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Sint8 volume[2];
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Uint8 pitch, repeat;
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} Audio;
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extern Audio audio[POLYPHONY];
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Uint8 audio_get_vu(Audio *c);
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int audio_render(Audio *c, Sint16 *sample, Sint16 *end);
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void audio_start(Audio *c, Uint16 adsr, Uint8 pitch);
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void audio_finished_handler(Audio *c); |