From dd657ad3f1428b026486db3ec36691df17ddf515 Mon Sep 17 00:00:00 2001 From: "Steve M. Robbins" Date: Sat, 22 Oct 2011 04:54:51 +0200 Subject: Import nyquist_3.05.orig.tar.gz [dgit import orig nyquist_3.05.orig.tar.gz] --- tran/alpassvc.c | 374 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 374 insertions(+) create mode 100644 tran/alpassvc.c (limited to 'tran/alpassvc.c') diff --git a/tran/alpassvc.c b/tran/alpassvc.c new file mode 100644 index 0000000..e5bdf4b --- /dev/null +++ b/tran/alpassvc.c @@ -0,0 +1,374 @@ +#include "stdio.h" +#ifndef mips +#include "stdlib.h" +#endif +#include "xlisp.h" +#include "sound.h" + +#include "falloc.h" +#include "cext.h" +#include "alpassvc.h" + +void alpassvc_free(); + + +typedef struct alpassvc_susp_struct { + snd_susp_node susp; + long terminate_cnt; + sound_type input; + long input_cnt; + sample_block_values_type input_ptr; + sound_type delaysnd; + long delaysnd_cnt; + sample_block_values_type delaysnd_ptr; + + float delay_scale_factor; + double feedback; + long buflen; + sample_type *delaybuf; + sample_type *delayptr; + sample_type *endptr; +} alpassvc_susp_node, *alpassvc_susp_type; + + +void alpassvc_nn_fetch(register alpassvc_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 float delay_scale_factor_reg; + register double feedback_reg; + register long buflen_reg; + register sample_type * delayptr_reg; + register sample_type * endptr_reg; + register sample_block_values_type delaysnd_ptr_reg; + register sample_block_values_type input_ptr_reg; + falloc_sample_block(out, "alpassvc_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 input input sample block: */ + susp_check_term_samples(input, input_ptr, input_cnt); + togo = min(togo, susp->input_cnt); + + /* don't run past the delaysnd input sample block: */ + susp_check_samples(delaysnd, delaysnd_ptr, delaysnd_cnt); + togo = min(togo, susp->delaysnd_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; + delay_scale_factor_reg = susp->delay_scale_factor; + feedback_reg = susp->feedback; + buflen_reg = susp->buflen; + delayptr_reg = susp->delayptr; + endptr_reg = susp->endptr; + delaysnd_ptr_reg = susp->delaysnd_ptr; + input_ptr_reg = susp->input_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ + register sample_type y, z, delaysamp; + register int delayi; + register sample_type *yptr; + + /* compute where to read y, we want y to be delay_snd samples + * after delay_ptr, where we write the new sample. First, + * conver from seconds to samples. Note: don't use actual sound_type + * names in comments! The translator isn't smart enough. + */ + delaysamp = *delaysnd_ptr_reg++ * delay_scale_factor_reg; + delayi = (int) delaysamp; /* get integer part */ + delaysamp = delaysamp - delayi; /* get phase */ + yptr = delayptr_reg + buflen_reg - (delayi + 1); + if (yptr >= endptr_reg) yptr -= buflen_reg; + /* now get y, the out-put of the delay, using interpolation */ + /* note that as phase increases, we use more of yptr[0] because + positive phase means longer buffer means read earlier sample */ + y = (float) ((yptr[0] * delaysamp) + (yptr[1] * (1.0 - delaysamp))); + /* WARNING: no check to keep delaysamp in range, so do this in LISP */ + + *delayptr_reg++ = z = (sample_type) (feedback_reg * y + *input_ptr_reg++); + /* Time out to update the buffer: + * this is a tricky buffer: buffer[0] == buffer[bufflen] + * the logical length is bufflen, but the actual length + * is bufflen + 1 to allow for a repeated sample at the + * end. This allows for efficient interpolation. + */ + if (delayptr_reg > endptr_reg) { + delayptr_reg = susp->delaybuf; + *delayptr_reg++ = *endptr_reg; + } + *out_ptr_reg++ = (sample_type) (y - feedback_reg * z);; + } while (--n); /* inner loop */ + + susp->buflen = buflen_reg; + susp->delayptr = delayptr_reg; + /* using delaysnd_ptr_reg is a bad idea on RS/6000: */ + susp->delaysnd_ptr += togo; + /* using input_ptr_reg is a bad idea on RS/6000: */ + susp->input_ptr += togo; + out_ptr += togo; + susp_took(input_cnt, togo); + susp_took(delaysnd_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; + } +} /* alpassvc_nn_fetch */ + + +void alpassvc_ns_fetch(register alpassvc_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 float delay_scale_factor_reg; + register double feedback_reg; + register long buflen_reg; + register sample_type * delayptr_reg; + register sample_type * endptr_reg; + register sample_type delaysnd_scale_reg = susp->delaysnd->scale; + register sample_block_values_type delaysnd_ptr_reg; + register sample_block_values_type input_ptr_reg; + falloc_sample_block(out, "alpassvc_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 input input sample block: */ + susp_check_term_samples(input, input_ptr, input_cnt); + togo = min(togo, susp->input_cnt); + + /* don't run past the delaysnd input sample block: */ + susp_check_samples(delaysnd, delaysnd_ptr, delaysnd_cnt); + togo = min(togo, susp->delaysnd_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; + delay_scale_factor_reg = susp->delay_scale_factor; + feedback_reg = susp->feedback; + buflen_reg = susp->buflen; + delayptr_reg = susp->delayptr; + endptr_reg = susp->endptr; + delaysnd_ptr_reg = susp->delaysnd_ptr; + input_ptr_reg = susp->input_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ + register sample_type y, z, delaysamp; + register int delayi; + register sample_type *yptr; + + /* compute where to read y, we want y to be delay_snd samples + * after delay_ptr, where we write the new sample. First, + * conver from seconds to samples. Note: don't use actual sound_type + * names in comments! The translator isn't smart enough. + */ + delaysamp = (delaysnd_scale_reg * *delaysnd_ptr_reg++) * delay_scale_factor_reg; + delayi = (int) delaysamp; /* get integer part */ + delaysamp = delaysamp - delayi; /* get phase */ + yptr = delayptr_reg + buflen_reg - (delayi + 1); + if (yptr >= endptr_reg) yptr -= buflen_reg; + /* now get y, the out-put of the delay, using interpolation */ + /* note that as phase increases, we use more of yptr[0] because + positive phase means longer buffer means read earlier sample */ + y = (float) ((yptr[0] * delaysamp) + (yptr[1] * (1.0 - delaysamp))); + /* WARNING: no check to keep delaysamp in range, so do this in LISP */ + + *delayptr_reg++ = z = (sample_type) (feedback_reg * y + *input_ptr_reg++); + /* Time out to update the buffer: + * this is a tricky buffer: buffer[0] == buffer[bufflen] + * the logical length is bufflen, but the actual length + * is bufflen + 1 to allow for a repeated sample at the + * end. This allows for efficient interpolation. + */ + if (delayptr_reg > endptr_reg) { + delayptr_reg = susp->delaybuf; + *delayptr_reg++ = *endptr_reg; + } + *out_ptr_reg++ = (sample_type) (y - feedback_reg * z);; + } while (--n); /* inner loop */ + + susp->buflen = buflen_reg; + susp->delayptr = delayptr_reg; + /* using delaysnd_ptr_reg is a bad idea on RS/6000: */ + susp->delaysnd_ptr += togo; + /* using input_ptr_reg is a bad idea on RS/6000: */ + susp->input_ptr += togo; + out_ptr += togo; + susp_took(input_cnt, togo); + susp_took(delaysnd_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; + } +} /* alpassvc_ns_fetch */ + + +void alpassvc_toss_fetch(susp, snd_list) + register alpassvc_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 input up to final_time for this block of zeros */ + while ((round((final_time - susp->input->t0) * susp->input->sr)) >= + susp->input->current) + susp_get_samples(input, input_ptr, input_cnt); + /* fetch samples from delaysnd up to final_time for this block of zeros */ + while ((round((final_time - susp->delaysnd->t0) * susp->delaysnd->sr)) >= + susp->delaysnd->current) + susp_get_samples(delaysnd, delaysnd_ptr, delaysnd_cnt); + /* convert to normal processing when we hit final_count */ + /* we want each signal positioned at final_time */ + n = round((final_time - susp->input->t0) * susp->input->sr - + (susp->input->current - susp->input_cnt)); + susp->input_ptr += n; + susp_took(input_cnt, n); + n = round((final_time - susp->delaysnd->t0) * susp->delaysnd->sr - + (susp->delaysnd->current - susp->delaysnd_cnt)); + susp->delaysnd_ptr += n; + susp_took(delaysnd_cnt, n); + susp->susp.fetch = susp->susp.keep_fetch; + (*(susp->susp.fetch))(susp, snd_list); +} + + +void alpassvc_mark(alpassvc_susp_type susp) +{ + sound_xlmark(susp->input); + sound_xlmark(susp->delaysnd); +} + + +void alpassvc_free(alpassvc_susp_type susp) +{ +free(susp->delaybuf); sound_unref(susp->input); + sound_unref(susp->delaysnd); + ffree_generic(susp, sizeof(alpassvc_susp_node), "alpassvc_free"); +} + + +void alpassvc_print_tree(alpassvc_susp_type susp, int n) +{ + indent(n); + stdputstr("input:"); + sound_print_tree_1(susp->input, n); + + indent(n); + stdputstr("delaysnd:"); + sound_print_tree_1(susp->delaysnd, n); +} + + +sound_type snd_make_alpassvc(sound_type input, sound_type delaysnd, double feedback, double maxdelay) +{ + register alpassvc_susp_type susp; + rate_type sr = max(input->sr, delaysnd->sr); + time_type t0 = max(input->t0, delaysnd->t0); + int interp_desc = 0; + sample_type scale_factor = 1.0F; + time_type t0_min = t0; + /* combine scale factors of linear inputs (INPUT) */ + scale_factor *= input->scale; + input->scale = 1.0F; + + /* try to push scale_factor back to a low sr input */ + if (input->sr < sr) { input->scale = scale_factor; scale_factor = 1.0F; } + + falloc_generic(susp, alpassvc_susp_node, "snd_make_alpassvc"); + susp->delay_scale_factor = (float) (input->sr * delaysnd->scale); + susp->feedback = feedback; + susp->buflen = max(2, (long) (input->sr * maxdelay + 2.5)); + susp->delaybuf = (sample_type *) calloc (susp->buflen + 1, sizeof(sample_type)); + susp->delayptr = susp->delaybuf; + susp->endptr = susp->delaybuf + susp->buflen; + + /* select a susp fn based on sample rates */ + interp_desc = (interp_desc << 2) + interp_style(input, sr); + interp_desc = (interp_desc << 2) + interp_style(delaysnd, sr); + switch (interp_desc) { + case INTERP_nn: susp->susp.fetch = alpassvc_nn_fetch; break; + case INTERP_ns: susp->susp.fetch = alpassvc_ns_fetch; break; + default: snd_badsr(); break; + } + + susp->terminate_cnt = UNKNOWN; + /* handle unequal start times, if any */ + if (t0 < input->t0) sound_prepend_zeros(input, t0); + if (t0 < delaysnd->t0) sound_prepend_zeros(delaysnd, t0); + /* minimum start time over all inputs: */ + t0_min = min(input->t0, min(delaysnd->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 = alpassvc_toss_fetch; + } + + /* initialize susp state */ + susp->susp.free = alpassvc_free; + susp->susp.sr = sr; + susp->susp.t0 = t0; + susp->susp.mark = alpassvc_mark; + susp->susp.print_tree = alpassvc_print_tree; + susp->susp.name = "alpassvc"; + susp->susp.log_stop_cnt = UNKNOWN; + susp->susp.current = 0; + susp->input = input; + susp->input_cnt = 0; + susp->delaysnd = delaysnd; + susp->delaysnd_cnt = 0; + return sound_create((snd_susp_type)susp, t0, sr, scale_factor); +} + + +sound_type snd_alpassvc(sound_type input, sound_type delaysnd, double feedback, double maxdelay) +{ + sound_type input_copy = sound_copy(input); + sound_type delaysnd_copy = sound_copy(delaysnd); + return snd_make_alpassvc(input_copy, delaysnd_copy, feedback, maxdelay); +} -- cgit v1.2.3