218 lines
6.8 KiB
C
218 lines
6.8 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 "stoponzero.h"
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void stoponzero_free(snd_susp_type a_susp);
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typedef struct stoponzero_susp_struct {
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snd_susp_node susp;
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int64_t terminate_cnt;
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boolean logically_stopped;
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sound_type s1;
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int s1_cnt;
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sample_block_values_type s1_ptr;
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} stoponzero_susp_node, *stoponzero_susp_type;
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void stoponzero_n_fetch(snd_susp_type a_susp, snd_list_type snd_list)
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{
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stoponzero_susp_type susp = (stoponzero_susp_type) a_susp;
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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_block_values_type s1_ptr_reg;
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falloc_sample_block(out, "stoponzero_n_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 s1 input sample block: */
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susp_check_term_log_samples(s1, s1_ptr, s1_cnt);
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togo = min(togo, susp->s1_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 = (int) (susp->terminate_cnt - (susp->susp.current + cnt));
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if (togo < 0) togo = 0; /* avoids rounding errros */
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if (togo == 0) break;
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}
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/* don't run past logical stop time */
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if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) {
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int64_t to_stop = (susp->susp.log_stop_cnt -
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(susp->susp.current + cnt));
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/* break if to_stop == 0 (we're at the logical stop)
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* AND cnt > 0 (we're not at the beginning of the
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* output block).
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*/
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if (to_stop < 0) to_stop = 0; /* avoids rounding errors */
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if (to_stop < togo) {
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if (to_stop == 0) {
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if (cnt) {
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togo = 0;
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break;
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} else /* keep togo as is: since cnt == 0, we
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* can set the logical stop flag on this
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* output block
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*/
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susp->logically_stopped = true;
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} else /* limit togo so we can start a new
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* block at the LST
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*/
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togo = (int) to_stop;
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}
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}
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n = togo;
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s1_ptr_reg = susp->s1_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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float samp = *s1_ptr_reg++;
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*out_ptr_reg++ = samp;
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if (samp <= 0.0F) {
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togo -= (n - 1);
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// after we update cnt below, terminate_cnt == current + cnt,
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// so terminate_cnt - (current + cnt) will be zero, and we'll
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// terminate
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susp->terminate_cnt = susp->susp.current + cnt - togo;
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n = 1;
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}
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} while (--n); /* inner loop */
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/* using s1_ptr_reg is a bad idea on RS/6000: */
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susp->s1_ptr += togo;
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out_ptr += togo;
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susp_took(s1_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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/* test for logical stop */
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if (susp->logically_stopped) {
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snd_list->logically_stopped = true;
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} else if (susp->susp.log_stop_cnt == susp->susp.current) {
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susp->logically_stopped = true;
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}
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} /* stoponzero_n_fetch */
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void stoponzero_toss_fetch(snd_susp_type a_susp, snd_list_type snd_list)
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{
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stoponzero_susp_type susp = (stoponzero_susp_type) a_susp;
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time_type final_time = susp->susp.t0;
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long n;
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/* fetch samples from s1 up to final_time for this block of zeros */
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while ((ROUNDBIG((final_time - susp->s1->t0) * susp->s1->sr)) >=
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susp->s1->current)
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susp_get_samples(s1, s1_ptr, s1_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 = (int) ROUNDBIG((final_time - susp->s1->t0) * susp->s1->sr -
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(susp->s1->current - susp->s1_cnt));
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susp->s1_ptr += n;
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susp_took(s1_cnt, n);
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susp->susp.fetch = susp->susp.keep_fetch;
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(*(susp->susp.fetch))(a_susp, snd_list);
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}
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void stoponzero_mark(snd_susp_type a_susp)
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{
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stoponzero_susp_type susp = (stoponzero_susp_type) a_susp;
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sound_xlmark(susp->s1);
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}
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void stoponzero_free(snd_susp_type a_susp)
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{
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stoponzero_susp_type susp = (stoponzero_susp_type) a_susp;
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sound_unref(susp->s1);
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ffree_generic(susp, sizeof(stoponzero_susp_node), "stoponzero_free");
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}
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void stoponzero_print_tree(snd_susp_type a_susp, int n)
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{
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stoponzero_susp_type susp = (stoponzero_susp_type) a_susp;
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indent(n);
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stdputstr("s1:");
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sound_print_tree_1(susp->s1, n);
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}
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sound_type snd_make_stoponzero(sound_type s1)
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{
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register stoponzero_susp_type susp;
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rate_type sr = s1->sr;
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time_type t0 = s1->t0;
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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 (S1) */
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scale_factor *= s1->scale;
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s1->scale = 1.0F;
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/* try to push scale_factor back to a low sr input */
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if (s1->sr < sr) { s1->scale = scale_factor; scale_factor = 1.0F; }
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falloc_generic(susp, stoponzero_susp_node, "snd_make_stoponzero");
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susp->susp.fetch = stoponzero_n_fetch;
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susp->terminate_cnt = UNKNOWN;
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/* handle unequal start times, if any */
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if (t0 < s1->t0) sound_prepend_zeros(s1, t0);
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/* minimum start time over all inputs: */
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t0_min = min(s1->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 = stoponzero_toss_fetch;
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}
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/* initialize susp state */
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susp->susp.free = stoponzero_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = stoponzero_mark;
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susp->susp.print_tree = stoponzero_print_tree;
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susp->susp.name = "stoponzero";
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susp->logically_stopped = false;
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susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s1);
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susp->susp.current = 0;
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susp->s1 = s1;
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susp->s1_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_stoponzero(sound_type s1)
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{
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sound_type s1_copy = sound_copy(s1);
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return snd_make_stoponzero(s1_copy);
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}
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