diff options
Diffstat (limited to 'tran/alpasscv.c')
-rw-r--r-- | tran/alpasscv.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/tran/alpasscv.c b/tran/alpasscv.c new file mode 100644 index 0000000..99c4855 --- /dev/null +++ b/tran/alpasscv.c @@ -0,0 +1,302 @@ +#include "stdio.h" +#ifndef mips +#include "stdlib.h" +#endif +#include "xlisp.h" +#include "sound.h" + +#include "falloc.h" +#include "cext.h" +#include "alpasscv.h" + +void alpasscv_free(); + + +typedef struct alpasscv_susp_struct { + snd_susp_node susp; + long terminate_cnt; + sound_type input; + long input_cnt; + sample_block_values_type input_ptr; + sound_type feedback; + long feedback_cnt; + sample_block_values_type feedback_ptr; + + long delaylen; + sample_type *delaybuf; + sample_type *delayptr; + sample_type *endptr; +} alpasscv_susp_node, *alpasscv_susp_type; + + +void alpasscv_nn_fetch(register alpasscv_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 input_ptr_reg; + falloc_sample_block(out, "alpasscv_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 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; + input_ptr_reg = susp->input_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ +register sample_type y, z, fb; + y = *delayptr_reg; + *delayptr_reg++ = z = (sample_type) ((fb = *feedback_ptr_reg++) * y + *input_ptr_reg++); + *out_ptr_reg++ = (sample_type) (y - fb * z); + if (delayptr_reg >= endptr_reg) delayptr_reg = susp->delaybuf;; + } while (--n); /* inner loop */ + + susp->delayptr = delayptr_reg; + /* using feedback_ptr_reg is a bad idea on RS/6000: */ + susp->feedback_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(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; + } +} /* alpasscv_nn_fetch */ + + +void alpasscv_ns_fetch(register alpasscv_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 input_ptr_reg; + falloc_sample_block(out, "alpasscv_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 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; + input_ptr_reg = susp->input_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ +register sample_type y, z, fb; + y = *delayptr_reg; + *delayptr_reg++ = z = (sample_type) ((fb = (feedback_scale_reg * *feedback_ptr_reg++)) * y + *input_ptr_reg++); + *out_ptr_reg++ = (sample_type) (y - fb * z); + if (delayptr_reg >= endptr_reg) delayptr_reg = susp->delaybuf;; + } while (--n); /* inner loop */ + + susp->delayptr = delayptr_reg; + /* using feedback_ptr_reg is a bad idea on RS/6000: */ + susp->feedback_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(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; + } +} /* alpasscv_ns_fetch */ + + +void alpasscv_toss_fetch(susp, snd_list) + register alpasscv_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 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->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->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 alpasscv_mark(alpasscv_susp_type susp) +{ + sound_xlmark(susp->input); + sound_xlmark(susp->feedback); +} + + +void alpasscv_free(alpasscv_susp_type susp) +{ +free(susp->delaybuf); sound_unref(susp->input); + sound_unref(susp->feedback); + ffree_generic(susp, sizeof(alpasscv_susp_node), "alpasscv_free"); +} + + +void alpasscv_print_tree(alpasscv_susp_type susp, int n) +{ + indent(n); + stdputstr("input:"); + sound_print_tree_1(susp->input, n); + + indent(n); + stdputstr("feedback:"); + sound_print_tree_1(susp->feedback, n); +} + + +sound_type snd_make_alpasscv(sound_type input, time_type delay, sound_type feedback) +{ + register alpasscv_susp_type susp; + rate_type sr = max(input->sr, feedback->sr); + time_type t0 = max(input->t0, feedback->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, alpasscv_susp_node, "snd_make_alpasscv"); + susp->delaylen = max(1, round(input->sr * delay)); + susp->delaybuf = (sample_type *) calloc (susp->delaylen, sizeof(sample_type)); + 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(input, sr); + interp_desc = (interp_desc << 2) + interp_style(feedback, sr); + switch (interp_desc) { + case INTERP_nn: susp->susp.fetch = alpasscv_nn_fetch; break; + case INTERP_ns: susp->susp.fetch = alpasscv_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 < feedback->t0) sound_prepend_zeros(feedback, t0); + /* minimum start time over all inputs: */ + t0_min = min(input->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 = alpasscv_toss_fetch; + } + + /* initialize susp state */ + susp->susp.free = alpasscv_free; + susp->susp.sr = sr; + susp->susp.t0 = t0; + susp->susp.mark = alpasscv_mark; + susp->susp.print_tree = alpasscv_print_tree; + susp->susp.name = "alpasscv"; + susp->susp.log_stop_cnt = UNKNOWN; + susp->susp.current = 0; + susp->input = input; + susp->input_cnt = 0; + susp->feedback = feedback; + susp->feedback_cnt = 0; + return sound_create((snd_susp_type)susp, t0, sr, scale_factor); +} + + +sound_type snd_alpasscv(sound_type input, time_type delay, sound_type feedback) +{ + sound_type input_copy = sound_copy(input); + sound_type feedback_copy = sound_copy(feedback); + return snd_make_alpasscv(input_copy, delay, feedback_copy); +} |