diff options
Diffstat (limited to 'tran/prod.c')
| -rw-r--r-- | tran/prod.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/tran/prod.c b/tran/prod.c new file mode 100644 index 0000000..dc2be08 --- /dev/null +++ b/tran/prod.c @@ -0,0 +1,244 @@ +#include "stdio.h" +#ifndef mips +#include "stdlib.h" +#endif +#include "xlisp.h" +#include "sound.h" + +#include "falloc.h" +#include "cext.h" +#include "prod.h" + +void prod_free(); + + +typedef struct prod_susp_struct { + snd_susp_node susp; + long terminate_cnt; + boolean logically_stopped; + sound_type s1; + long s1_cnt; + sample_block_values_type s1_ptr; + sound_type s2; + long s2_cnt; + sample_block_values_type s2_ptr; +} prod_susp_node, *prod_susp_type; + + +void prod_nn_fetch(register prod_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_block_values_type s2_ptr_reg; + register sample_block_values_type s1_ptr_reg; + falloc_sample_block(out, "prod_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 s1 input sample block: */ + susp_check_term_log_samples(s1, s1_ptr, s1_cnt); + togo = min(togo, susp->s1_cnt); + + /* don't run past the s2 input sample block: */ + susp_check_term_log_samples(s2, s2_ptr, s2_cnt); + togo = min(togo, susp->s2_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; + } + + + /* don't run past logical stop time */ + if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) { + int to_stop = susp->susp.log_stop_cnt - (susp->susp.current + cnt); + /* break if to_stop == 0 (we're at the logical stop) + * AND cnt > 0 (we're not at the beginning of the + * output block). + */ + if (to_stop < togo) { + if (to_stop == 0) { + if (cnt) { + togo = 0; + break; + } else /* keep togo as is: since cnt == 0, we + * can set the logical stop flag on this + * output block + */ + susp->logically_stopped = true; + } else /* limit togo so we can start a new + * block at the LST + */ + togo = to_stop; + } + } + + n = togo; + s2_ptr_reg = susp->s2_ptr; + s1_ptr_reg = susp->s1_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ +*out_ptr_reg++ = *s1_ptr_reg++ * *s2_ptr_reg++; + } while (--n); /* inner loop */ + + /* using s2_ptr_reg is a bad idea on RS/6000: */ + susp->s2_ptr += togo; + /* using s1_ptr_reg is a bad idea on RS/6000: */ + susp->s1_ptr += togo; + out_ptr += togo; + susp_took(s1_cnt, togo); + susp_took(s2_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; + } + /* test for logical stop */ + if (susp->logically_stopped) { + snd_list->logically_stopped = true; + } else if (susp->susp.log_stop_cnt == susp->susp.current) { + susp->logically_stopped = true; + } +} /* prod_nn_fetch */ + + +void prod_toss_fetch(susp, snd_list) + register prod_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 s1 up to final_time for this block of zeros */ + while ((round((final_time - susp->s1->t0) * susp->s1->sr)) >= + susp->s1->current) + susp_get_samples(s1, s1_ptr, s1_cnt); + /* fetch samples from s2 up to final_time for this block of zeros */ + while ((round((final_time - susp->s2->t0) * susp->s2->sr)) >= + susp->s2->current) + susp_get_samples(s2, s2_ptr, s2_cnt); + /* convert to normal processing when we hit final_count */ + /* we want each signal positioned at final_time */ + n = round((final_time - susp->s1->t0) * susp->s1->sr - + (susp->s1->current - susp->s1_cnt)); + susp->s1_ptr += n; + susp_took(s1_cnt, n); + n = round((final_time - susp->s2->t0) * susp->s2->sr - + (susp->s2->current - susp->s2_cnt)); + susp->s2_ptr += n; + susp_took(s2_cnt, n); + susp->susp.fetch = susp->susp.keep_fetch; + (*(susp->susp.fetch))(susp, snd_list); +} + + +void prod_mark(prod_susp_type susp) +{ + sound_xlmark(susp->s1); + sound_xlmark(susp->s2); +} + + +void prod_free(prod_susp_type susp) +{ + sound_unref(susp->s1); + sound_unref(susp->s2); + ffree_generic(susp, sizeof(prod_susp_node), "prod_free"); +} + + +void prod_print_tree(prod_susp_type susp, int n) +{ + indent(n); + stdputstr("s1:"); + sound_print_tree_1(susp->s1, n); + + indent(n); + stdputstr("s2:"); + sound_print_tree_1(susp->s2, n); +} + + +sound_type snd_make_prod(sound_type s1, sound_type s2) +{ + register prod_susp_type susp; + rate_type sr = max(s1->sr, s2->sr); + time_type t0 = max(s1->t0, s2->t0); + int interp_desc = 0; + sample_type scale_factor = 1.0F; + time_type t0_min = t0; + long lsc; + /* sort commutative signals: (S1 S2) */ + snd_sort_2(&s1, &s2, sr); + + /* combine scale factors of linear inputs (S1 S2) */ + scale_factor *= s1->scale; + s1->scale = 1.0F; + scale_factor *= s2->scale; + s2->scale = 1.0F; + + /* try to push scale_factor back to a low sr input */ + if (s1->sr < sr) { s1->scale = scale_factor; scale_factor = 1.0F; } + else if (s2->sr < sr) { s2->scale = scale_factor; scale_factor = 1.0F; } + + falloc_generic(susp, prod_susp_node, "snd_make_prod"); + susp->susp.fetch = prod_nn_fetch; + susp->terminate_cnt = UNKNOWN; + /* handle unequal start times, if any */ + if (t0 < s1->t0) sound_prepend_zeros(s1, t0); + if (t0 < s2->t0) sound_prepend_zeros(s2, t0); + /* minimum start time over all inputs: */ + t0_min = min(s1->t0, min(s2->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 = prod_toss_fetch; + } + + /* initialize susp state */ + susp->susp.free = prod_free; + susp->susp.sr = sr; + susp->susp.t0 = t0; + susp->susp.mark = prod_mark; + susp->susp.print_tree = prod_print_tree; + susp->susp.name = "prod"; + susp->logically_stopped = false; + susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s1); + lsc = logical_stop_cnt_cvt(s2); + if (susp->susp.log_stop_cnt > lsc) + susp->susp.log_stop_cnt = lsc; + susp->susp.current = 0; + susp->s1 = s1; + susp->s1_cnt = 0; + susp->s2 = s2; + susp->s2_cnt = 0; + return sound_create((snd_susp_type)susp, t0, sr, scale_factor); +} + + +sound_type snd_prod(sound_type s1, sound_type s2) +{ + sound_type s1_copy = sound_copy(s1); + sound_type s2_copy = sound_copy(s2); + return snd_make_prod(s1_copy, s2_copy); +} |