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(ALPASS-ALG
(NAME "alpass")
(ARGUMENTS ("sound_type" "input") ("time_type" "delay") ("double" "feedback"))
(START (MIN input))
(STATE ("double" "feedback" "feedback")
("long" "delaylen" "MAX(1, round(input->sr * delay))")
("sample_type *" "delaybuf"
"(sample_type *) calloc (susp->delaylen, sizeof(sample_type))")
("sample_type *" "delayptr" "susp->delaybuf")
("sample_type *" "endptr" "susp->delaybuf + susp->delaylen"))
(CONSTANT "feedback" "delaylen" "endptr")
(NOT-REGISTER delaybuf)
(LINEAR input)
(TERMINATE (MIN input))
(INNER-LOOP-LOCALS "register sample_type y, z;\n")
(INNER-LOOP " y = *delayptr;
*delayptr++ = z = (sample_type) (feedback * y + input);
output = (sample_type) (y - feedback * z);
if (delayptr >= endptr) delayptr = susp->delaybuf;")
(FINALIZATION "free(susp->delaybuf);")
)
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