mirror of
https://github.com/cookiengineer/audacity
synced 2025-05-05 22:28:57 +02:00
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
#include "stdio.h"
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#ifndef mips
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#include "stdlib.h"
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#endif
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#include "xlisp.h"
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#include "sound.h"
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#include "falloc.h"
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#include "cext.h"
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#include "osc.h"
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void osc_free();
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typedef struct osc_susp_struct {
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snd_susp_node susp;
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long terminate_cnt;
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double ph_incr;
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table_type the_table;
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sample_type *table_ptr;
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double table_len;
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double phase;
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} osc_susp_node, *osc_susp_type;
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void osc__fetch(register osc_susp_type susp, snd_list_type snd_list)
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{
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int cnt = 0; /* how many samples computed */
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int togo;
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int n;
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sample_block_type out;
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register sample_block_values_type out_ptr;
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register sample_block_values_type out_ptr_reg;
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register double ph_incr_reg;
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register sample_type * table_ptr_reg;
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register double table_len_reg;
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register double phase_reg;
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falloc_sample_block(out, "osc__fetch");
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out_ptr = out->samples;
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snd_list->block = out;
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while (cnt < max_sample_block_len) { /* outer loop */
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/* first compute how many samples to generate in inner loop: */
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/* don't overflow the output sample block: */
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togo = max_sample_block_len - cnt;
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/* don't run past terminate time */
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if (susp->terminate_cnt != UNKNOWN &&
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susp->terminate_cnt <= susp->susp.current + cnt + togo) {
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togo = susp->terminate_cnt - (susp->susp.current + cnt);
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if (togo == 0) break;
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}
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n = togo;
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ph_incr_reg = susp->ph_incr;
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table_ptr_reg = susp->table_ptr;
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table_len_reg = susp->table_len;
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phase_reg = susp->phase;
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out_ptr_reg = out_ptr;
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if (n) do { /* the inner sample computation loop */
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long table_index = (long) phase_reg;
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double x1 = table_ptr_reg[table_index];
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*out_ptr_reg++ = (sample_type) (x1 + (phase_reg - table_index) *
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(table_ptr_reg[table_index + 1] - x1));
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phase_reg += ph_incr_reg;
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while (phase_reg >= table_len_reg) phase_reg -= table_len_reg;
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;
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} while (--n); /* inner loop */
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susp->phase = phase_reg;
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out_ptr += togo;
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cnt += togo;
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} /* outer loop */
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/* test for termination */
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if (togo == 0 && cnt == 0) {
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snd_list_terminate(snd_list);
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} else {
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snd_list->block_len = cnt;
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susp->susp.current += cnt;
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}
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} /* osc__fetch */
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void osc_free(osc_susp_type susp)
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{
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table_unref(susp->the_table);
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ffree_generic(susp, sizeof(osc_susp_node), "osc_free");
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}
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void osc_print_tree(osc_susp_type susp, int n)
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{
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}
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sound_type snd_make_osc(sound_type input, double step, rate_type sr, double hz, time_type t0, time_type d, double phase)
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{
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register osc_susp_type susp;
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/* sr specified as input parameter */
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/* t0 specified as input parameter */
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sample_type scale_factor = 1.0F;
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falloc_generic(susp, osc_susp_node, "snd_make_osc");
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susp->ph_incr = 0;
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susp->the_table = sound_to_table(input);
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susp->table_ptr = susp->the_table->samples;
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susp->table_len = susp->the_table->length;
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susp->phase = compute_phase(phase, step, (long) susp->table_len,
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input->sr, sr, hz, &susp->ph_incr);
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susp->susp.fetch = osc__fetch;
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susp->terminate_cnt = round((d) * sr);
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/* initialize susp state */
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susp->susp.free = osc_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = NULL;
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susp->susp.print_tree = osc_print_tree;
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susp->susp.name = "osc";
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susp->susp.log_stop_cnt = UNKNOWN;
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susp->susp.current = 0;
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return sound_create((snd_susp_type)susp, t0, sr, scale_factor);
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}
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sound_type snd_osc(sound_type input, double step, rate_type sr, double hz, time_type t0, time_type d, double phase)
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{
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return snd_make_osc(input, step, sr, hz, t0, d, phase);
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}
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