diff options
Diffstat (limited to 'tran/delaycv.c')
| -rw-r--r-- | tran/delaycv.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/tran/delaycv.c b/tran/delaycv.c new file mode 100644 index 0000000..984e88d --- /dev/null +++ b/tran/delaycv.c @@ -0,0 +1,300 @@ +#include "stdio.h" +#ifndef mips +#include "stdlib.h" +#endif +#include "xlisp.h" +#include "sound.h" + +#include "falloc.h" +#include "cext.h" +#include "delaycv.h" + +void delaycv_free(); + + +typedef struct delaycv_susp_struct { + snd_susp_node susp; + long terminate_cnt; + sound_type s; + long s_cnt; + sample_block_values_type s_ptr; + sound_type feedback; + long feedback_cnt; + sample_block_values_type feedback_ptr; + + long delaylen; + sample_type *delaybuf; + sample_type *delayptr; + sample_type *endptr; +} delaycv_susp_node, *delaycv_susp_type; + + +void delaycv_nn_fetch(register delaycv_susp_type susp, snd_list_type snd_list) +{ + int cnt = 0; /* how many samples computed */ + int togo; + int n; + sample_block_type out; + register sample_block_values_type out_ptr; + + register sample_block_values_type out_ptr_reg; + + register sample_type * delayptr_reg; + register sample_type * endptr_reg; + register sample_block_values_type feedback_ptr_reg; + register sample_block_values_type s_ptr_reg; + falloc_sample_block(out, "delaycv_nn_fetch"); + out_ptr = out->samples; + snd_list->block = out; + + while (cnt < max_sample_block_len) { /* outer loop */ + /* first compute how many samples to generate in inner loop: */ + /* don't overflow the output sample block: */ + togo = max_sample_block_len - cnt; + + /* don't run past the s input sample block: */ + susp_check_term_samples(s, s_ptr, s_cnt); + togo = min(togo, susp->s_cnt); + + /* don't run past the feedback input sample block: */ + susp_check_samples(feedback, feedback_ptr, feedback_cnt); + togo = min(togo, susp->feedback_cnt); + + /* don't run past terminate time */ + if (susp->terminate_cnt != UNKNOWN && + susp->terminate_cnt <= susp->susp.current + cnt + togo) { + togo = susp->terminate_cnt - (susp->susp.current + cnt); + if (togo == 0) break; + } + + n = togo; + delayptr_reg = susp->delayptr; + endptr_reg = susp->endptr; + feedback_ptr_reg = susp->feedback_ptr; + s_ptr_reg = susp->s_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ +*out_ptr_reg++ = *delayptr_reg; + *delayptr_reg = *delayptr_reg * *feedback_ptr_reg++ + *s_ptr_reg++; + if (++delayptr_reg >= endptr_reg) delayptr_reg = susp->delaybuf;; + } while (--n); /* inner loop */ + + susp->delayptr = delayptr_reg; + susp->endptr = endptr_reg; + /* using feedback_ptr_reg is a bad idea on RS/6000: */ + susp->feedback_ptr += togo; + /* using s_ptr_reg is a bad idea on RS/6000: */ + susp->s_ptr += togo; + out_ptr += togo; + susp_took(s_cnt, togo); + susp_took(feedback_cnt, togo); + cnt += togo; + } /* outer loop */ + + /* test for termination */ + if (togo == 0 && cnt == 0) { + snd_list_terminate(snd_list); + } else { + snd_list->block_len = cnt; + susp->susp.current += cnt; + } +} /* delaycv_nn_fetch */ + + +void delaycv_ns_fetch(register delaycv_susp_type susp, snd_list_type snd_list) +{ + int cnt = 0; /* how many samples computed */ + int togo; + int n; + sample_block_type out; + register sample_block_values_type out_ptr; + + register sample_block_values_type out_ptr_reg; + + register sample_type * delayptr_reg; + register sample_type * endptr_reg; + register sample_type feedback_scale_reg = susp->feedback->scale; + register sample_block_values_type feedback_ptr_reg; + register sample_block_values_type s_ptr_reg; + falloc_sample_block(out, "delaycv_ns_fetch"); + out_ptr = out->samples; + snd_list->block = out; + + while (cnt < max_sample_block_len) { /* outer loop */ + /* first compute how many samples to generate in inner loop: */ + /* don't overflow the output sample block: */ + togo = max_sample_block_len - cnt; + + /* don't run past the s input sample block: */ + susp_check_term_samples(s, s_ptr, s_cnt); + togo = min(togo, susp->s_cnt); + + /* don't run past the feedback input sample block: */ + susp_check_samples(feedback, feedback_ptr, feedback_cnt); + togo = min(togo, susp->feedback_cnt); + + /* don't run past terminate time */ + if (susp->terminate_cnt != UNKNOWN && + susp->terminate_cnt <= susp->susp.current + cnt + togo) { + togo = susp->terminate_cnt - (susp->susp.current + cnt); + if (togo == 0) break; + } + + n = togo; + delayptr_reg = susp->delayptr; + endptr_reg = susp->endptr; + feedback_ptr_reg = susp->feedback_ptr; + s_ptr_reg = susp->s_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ +*out_ptr_reg++ = *delayptr_reg; + *delayptr_reg = *delayptr_reg * (feedback_scale_reg * *feedback_ptr_reg++) + *s_ptr_reg++; + if (++delayptr_reg >= endptr_reg) delayptr_reg = susp->delaybuf;; + } while (--n); /* inner loop */ + + susp->delayptr = delayptr_reg; + susp->endptr = endptr_reg; + /* using feedback_ptr_reg is a bad idea on RS/6000: */ + susp->feedback_ptr += togo; + /* using s_ptr_reg is a bad idea on RS/6000: */ + susp->s_ptr += togo; + out_ptr += togo; + susp_took(s_cnt, togo); + susp_took(feedback_cnt, togo); + cnt += togo; + } /* outer loop */ + + /* test for termination */ + if (togo == 0 && cnt == 0) { + snd_list_terminate(snd_list); + } else { + snd_list->block_len = cnt; + susp->susp.current += cnt; + } +} /* delaycv_ns_fetch */ + + +void delaycv_toss_fetch(susp, snd_list) + register delaycv_susp_type susp; + snd_list_type snd_list; +{ + long final_count = susp->susp.toss_cnt; + time_type final_time = susp->susp.t0; + long n; + + /* fetch samples from s up to final_time for this block of zeros */ + while ((round((final_time - susp->s->t0) * susp->s->sr)) >= + susp->s->current) + susp_get_samples(s, s_ptr, s_cnt); + /* fetch samples from feedback up to final_time for this block of zeros */ + while ((round((final_time - susp->feedback->t0) * susp->feedback->sr)) >= + susp->feedback->current) + susp_get_samples(feedback, feedback_ptr, feedback_cnt); + /* convert to normal processing when we hit final_count */ + /* we want each signal positioned at final_time */ + n = round((final_time - susp->s->t0) * susp->s->sr - + (susp->s->current - susp->s_cnt)); + susp->s_ptr += n; + susp_took(s_cnt, n); + n = round((final_time - susp->feedback->t0) * susp->feedback->sr - + (susp->feedback->current - susp->feedback_cnt)); + susp->feedback_ptr += n; + susp_took(feedback_cnt, n); + susp->susp.fetch = susp->susp.keep_fetch; + (*(susp->susp.fetch))(susp, snd_list); +} + + +void delaycv_mark(delaycv_susp_type susp) +{ + sound_xlmark(susp->s); + sound_xlmark(susp->feedback); +} + + +void delaycv_free(delaycv_susp_type susp) +{ +free(susp->delaybuf); sound_unref(susp->s); + sound_unref(susp->feedback); + ffree_generic(susp, sizeof(delaycv_susp_node), "delaycv_free"); +} + + +void delaycv_print_tree(delaycv_susp_type susp, int n) +{ + indent(n); + stdputstr("s:"); + sound_print_tree_1(susp->s, n); + + indent(n); + stdputstr("feedback:"); + sound_print_tree_1(susp->feedback, n); +} + + +sound_type snd_make_delaycv(sound_type s, time_type delay, sound_type feedback) +{ + register delaycv_susp_type susp; + rate_type sr = max(s->sr, feedback->sr); + time_type t0 = max(s->t0, feedback->t0); + int interp_desc = 0; + sample_type scale_factor = 1.0F; + time_type t0_min = t0; + /* combine scale factors of linear inputs (S) */ + scale_factor *= s->scale; + s->scale = 1.0F; + + /* try to push scale_factor back to a low sr input */ + if (s->sr < sr) { s->scale = scale_factor; scale_factor = 1.0F; } + + falloc_generic(susp, delaycv_susp_node, "snd_make_delaycv"); + susp->delaylen = round(s->sr * delay); + susp->delaybuf = (sample_type *) calloc (sizeof(double), susp->delaylen); + susp->delayptr = susp->delaybuf; + susp->endptr = susp->delaybuf + susp->delaylen; + + /* select a susp fn based on sample rates */ + interp_desc = (interp_desc << 2) + interp_style(s, sr); + interp_desc = (interp_desc << 2) + interp_style(feedback, sr); + switch (interp_desc) { + case INTERP_nn: susp->susp.fetch = delaycv_nn_fetch; break; + case INTERP_ns: susp->susp.fetch = delaycv_ns_fetch; break; + default: snd_badsr(); break; + } + + susp->terminate_cnt = UNKNOWN; + /* handle unequal start times, if any */ + if (t0 < s->t0) sound_prepend_zeros(s, t0); + if (t0 < feedback->t0) sound_prepend_zeros(feedback, t0); + /* minimum start time over all inputs: */ + t0_min = min(s->t0, min(feedback->t0, t0)); + /* how many samples to toss before t0: */ + susp->susp.toss_cnt = (long) ((t0 - t0_min) * sr + 0.5); + if (susp->susp.toss_cnt > 0) { + susp->susp.keep_fetch = susp->susp.fetch; + susp->susp.fetch = delaycv_toss_fetch; + } + + /* initialize susp state */ + susp->susp.free = delaycv_free; + susp->susp.sr = sr; + susp->susp.t0 = t0; + susp->susp.mark = delaycv_mark; + susp->susp.print_tree = delaycv_print_tree; + susp->susp.name = "delaycv"; + susp->susp.log_stop_cnt = UNKNOWN; + susp->susp.current = 0; + susp->s = s; + susp->s_cnt = 0; + susp->feedback = feedback; + susp->feedback_cnt = 0; + return sound_create((snd_susp_type)susp, t0, sr, scale_factor); +} + + +sound_type snd_delaycv(sound_type s, time_type delay, sound_type feedback) +{ + sound_type s_copy = sound_copy(s); + sound_type feedback_copy = sound_copy(feedback); + return snd_make_delaycv(s_copy, delay, feedback_copy); +} |