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(FMOSC-ALG
(NAME "fmosc")
(ARGUMENTS ("sound_type" "s") ("double" "step") ("rate_type" "sr")
("double" "hz") ("time_type" "t0") ("sound_type" "s_fm")
("double" "phase"))
(TABLE "s")
(NOT-IN-INNER-LOOP "s")
(STATE ("table_type" "the_table" "sound_to_table(s)")
("double" "table_len" "susp->the_table->length")
("double" "ph_incr" "0")
("sample_type *" "table_ptr" "susp->the_table->samples")
("double" "phase" "compute_phase(phase, step, (long) susp->table_len,
s->sr, sr, hz, &susp->ph_incr);
s_fm->scale *= hz != 0 ? (sample_type) (susp->ph_incr / hz)
: s->sr / (sr * step_to_hz(step))") ) ; cancel 0/0
(ALWAYS-SCALE s_fm)
(INLINE-INTERPOLATION T) ; so that modulation can be low frequency
(STEP-FUNCTION s_fm)
(TERMINATE (MIN s_fm))
(LOGICAL-STOP (MIN s_fm))
(INNER-LOOP-LOCALS " long table_index;
double x1;
")
(INNER-LOOP "table_index = (long) phase;
x1 = table_ptr[table_index];
output = (sample_type) (x1 + (phase - table_index) *
(table_ptr[table_index + 1] - x1));
phase += ph_incr + s_fm;
while (phase > table_len) phase -= table_len;
/* watch out for negative frequencies! */
while (phase < 0) phase += table_len")
(CONSTANT "ph_incr" "table_len" "table_ptr" "table")
(SAMPLE-RATE "sr")
(FINALIZATION " table_unref(susp->the_table);
")
)
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