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