mirror of
https://github.com/cookiengineer/audacity
synced 2025-06-16 08:09:32 +02:00
301 lines
9.1 KiB
C
301 lines
9.1 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 "delaycv.h"
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void delaycv_free();
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typedef struct delaycv_susp_struct {
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snd_susp_node susp;
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long terminate_cnt;
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sound_type s;
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long s_cnt;
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sample_block_values_type s_ptr;
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sound_type feedback;
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long feedback_cnt;
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sample_block_values_type feedback_ptr;
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long delaylen;
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sample_type *delaybuf;
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sample_type *delayptr;
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sample_type *endptr;
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} delaycv_susp_node, *delaycv_susp_type;
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void delaycv_nn_fetch(register delaycv_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 sample_type * delayptr_reg;
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register sample_type * endptr_reg;
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register sample_block_values_type feedback_ptr_reg;
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register sample_block_values_type s_ptr_reg;
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falloc_sample_block(out, "delaycv_nn_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 the s input sample block: */
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susp_check_term_samples(s, s_ptr, s_cnt);
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togo = min(togo, susp->s_cnt);
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/* don't run past the feedback input sample block: */
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susp_check_samples(feedback, feedback_ptr, feedback_cnt);
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togo = min(togo, susp->feedback_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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delayptr_reg = susp->delayptr;
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endptr_reg = susp->endptr;
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feedback_ptr_reg = susp->feedback_ptr;
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s_ptr_reg = susp->s_ptr;
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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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*out_ptr_reg++ = *delayptr_reg;
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*delayptr_reg = *delayptr_reg * *feedback_ptr_reg++ + *s_ptr_reg++;
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if (++delayptr_reg >= endptr_reg) delayptr_reg = susp->delaybuf;;
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} while (--n); /* inner loop */
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susp->delayptr = delayptr_reg;
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susp->endptr = endptr_reg;
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/* using feedback_ptr_reg is a bad idea on RS/6000: */
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susp->feedback_ptr += togo;
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/* using s_ptr_reg is a bad idea on RS/6000: */
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susp->s_ptr += togo;
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out_ptr += togo;
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susp_took(s_cnt, togo);
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susp_took(feedback_cnt, 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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} /* delaycv_nn_fetch */
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void delaycv_ns_fetch(register delaycv_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 sample_type * delayptr_reg;
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register sample_type * endptr_reg;
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register sample_type feedback_scale_reg = susp->feedback->scale;
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register sample_block_values_type feedback_ptr_reg;
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register sample_block_values_type s_ptr_reg;
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falloc_sample_block(out, "delaycv_ns_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 the s input sample block: */
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susp_check_term_samples(s, s_ptr, s_cnt);
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togo = min(togo, susp->s_cnt);
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/* don't run past the feedback input sample block: */
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susp_check_samples(feedback, feedback_ptr, feedback_cnt);
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togo = min(togo, susp->feedback_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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delayptr_reg = susp->delayptr;
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endptr_reg = susp->endptr;
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feedback_ptr_reg = susp->feedback_ptr;
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s_ptr_reg = susp->s_ptr;
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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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*out_ptr_reg++ = *delayptr_reg;
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*delayptr_reg = *delayptr_reg * (feedback_scale_reg * *feedback_ptr_reg++) + *s_ptr_reg++;
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if (++delayptr_reg >= endptr_reg) delayptr_reg = susp->delaybuf;;
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} while (--n); /* inner loop */
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susp->delayptr = delayptr_reg;
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susp->endptr = endptr_reg;
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/* using feedback_ptr_reg is a bad idea on RS/6000: */
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susp->feedback_ptr += togo;
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/* using s_ptr_reg is a bad idea on RS/6000: */
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susp->s_ptr += togo;
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out_ptr += togo;
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susp_took(s_cnt, togo);
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susp_took(feedback_cnt, 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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} /* delaycv_ns_fetch */
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void delaycv_toss_fetch(susp, snd_list)
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register delaycv_susp_type susp;
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snd_list_type snd_list;
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{
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long final_count = susp->susp.toss_cnt;
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time_type final_time = susp->susp.t0;
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long n;
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/* fetch samples from s up to final_time for this block of zeros */
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while ((round((final_time - susp->s->t0) * susp->s->sr)) >=
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susp->s->current)
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susp_get_samples(s, s_ptr, s_cnt);
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/* fetch samples from feedback up to final_time for this block of zeros */
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while ((round((final_time - susp->feedback->t0) * susp->feedback->sr)) >=
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susp->feedback->current)
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susp_get_samples(feedback, feedback_ptr, feedback_cnt);
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/* convert to normal processing when we hit final_count */
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/* we want each signal positioned at final_time */
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n = round((final_time - susp->s->t0) * susp->s->sr -
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(susp->s->current - susp->s_cnt));
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susp->s_ptr += n;
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susp_took(s_cnt, n);
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n = round((final_time - susp->feedback->t0) * susp->feedback->sr -
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(susp->feedback->current - susp->feedback_cnt));
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susp->feedback_ptr += n;
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susp_took(feedback_cnt, n);
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susp->susp.fetch = susp->susp.keep_fetch;
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(*(susp->susp.fetch))(susp, snd_list);
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}
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void delaycv_mark(delaycv_susp_type susp)
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{
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sound_xlmark(susp->s);
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sound_xlmark(susp->feedback);
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}
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void delaycv_free(delaycv_susp_type susp)
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{
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free(susp->delaybuf); sound_unref(susp->s);
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sound_unref(susp->feedback);
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ffree_generic(susp, sizeof(delaycv_susp_node), "delaycv_free");
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}
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void delaycv_print_tree(delaycv_susp_type susp, int n)
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{
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indent(n);
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stdputstr("s:");
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sound_print_tree_1(susp->s, n);
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indent(n);
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stdputstr("feedback:");
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sound_print_tree_1(susp->feedback, n);
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}
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sound_type snd_make_delaycv(sound_type s, time_type delay, sound_type feedback)
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{
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register delaycv_susp_type susp;
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rate_type sr = max(s->sr, feedback->sr);
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time_type t0 = max(s->t0, feedback->t0);
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int interp_desc = 0;
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sample_type scale_factor = 1.0F;
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time_type t0_min = t0;
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/* combine scale factors of linear inputs (S) */
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scale_factor *= s->scale;
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s->scale = 1.0F;
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/* try to push scale_factor back to a low sr input */
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if (s->sr < sr) { s->scale = scale_factor; scale_factor = 1.0F; }
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falloc_generic(susp, delaycv_susp_node, "snd_make_delaycv");
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susp->delaylen = round(s->sr * delay);
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susp->delaybuf = (sample_type *) calloc (sizeof(double), susp->delaylen);
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susp->delayptr = susp->delaybuf;
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susp->endptr = susp->delaybuf + susp->delaylen;
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/* select a susp fn based on sample rates */
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interp_desc = (interp_desc << 2) + interp_style(s, sr);
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interp_desc = (interp_desc << 2) + interp_style(feedback, sr);
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switch (interp_desc) {
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case INTERP_nn: susp->susp.fetch = delaycv_nn_fetch; break;
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case INTERP_ns: susp->susp.fetch = delaycv_ns_fetch; break;
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default: snd_badsr(); break;
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}
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susp->terminate_cnt = UNKNOWN;
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/* handle unequal start times, if any */
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if (t0 < s->t0) sound_prepend_zeros(s, t0);
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if (t0 < feedback->t0) sound_prepend_zeros(feedback, t0);
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/* minimum start time over all inputs: */
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t0_min = min(s->t0, min(feedback->t0, t0));
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/* how many samples to toss before t0: */
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susp->susp.toss_cnt = (long) ((t0 - t0_min) * sr + 0.5);
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if (susp->susp.toss_cnt > 0) {
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susp->susp.keep_fetch = susp->susp.fetch;
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susp->susp.fetch = delaycv_toss_fetch;
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}
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/* initialize susp state */
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susp->susp.free = delaycv_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = delaycv_mark;
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susp->susp.print_tree = delaycv_print_tree;
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susp->susp.name = "delaycv";
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susp->susp.log_stop_cnt = UNKNOWN;
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susp->susp.current = 0;
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susp->s = s;
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susp->s_cnt = 0;
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susp->feedback = feedback;
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susp->feedback_cnt = 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_delaycv(sound_type s, time_type delay, sound_type feedback)
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{
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sound_type s_copy = sound_copy(s);
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sound_type feedback_copy = sound_copy(feedback);
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return snd_make_delaycv(s_copy, delay, feedback_copy);
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}
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