mirror of
https://github.com/cookiengineer/audacity
synced 2025-05-03 17:19:43 +02:00
240 lines
7.1 KiB
C
240 lines
7.1 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 "shape.h"
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void shape_free(snd_susp_type a_susp);
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typedef struct shape_susp_struct {
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snd_susp_node susp;
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long terminate_cnt;
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boolean logically_stopped;
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sound_type sin;
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long sin_cnt;
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sample_block_values_type sin_ptr;
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double time_to_index;
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double origin;
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table_type the_table;
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sample_type *fcn_table;
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double table_len;
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} shape_susp_node, *shape_susp_type;
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void shape_s_fetch(snd_susp_type a_susp, snd_list_type snd_list)
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{
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shape_susp_type susp = (shape_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 double time_to_index_reg;
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register double origin_reg;
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register sample_type * fcn_table_reg;
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register double table_len_reg;
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register sample_type sin_scale_reg = susp->sin->scale;
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register sample_block_values_type sin_ptr_reg;
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falloc_sample_block(out, "shape_s_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 sin input sample block: */
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susp_check_term_log_samples(sin, sin_ptr, sin_cnt);
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togo = min(togo, susp->sin_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 = 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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int to_stop = susp->susp.log_stop_cnt - (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 = to_stop;
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}
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}
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n = togo;
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time_to_index_reg = susp->time_to_index;
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origin_reg = susp->origin;
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fcn_table_reg = susp->fcn_table;
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table_len_reg = susp->table_len;
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sin_ptr_reg = susp->sin_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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register double offset, x1;
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register long table_index;
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register double phase = (sin_scale_reg * *sin_ptr_reg++);
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if (phase > 1.0) phase = 1.0;
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else if (phase < -1.0) phase = -1.0;
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offset = (phase + origin_reg) * time_to_index_reg;
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table_index = (long) offset;
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if (table_index < 0) {
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table_index = 0;
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offset = 0;
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}
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if (table_index >= table_len_reg) {
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offset = table_len_reg - 1;
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table_index = (long) offset;
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}
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x1 = fcn_table_reg[table_index];
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*out_ptr_reg++ = (sample_type) (x1 + (offset - table_index) *
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(fcn_table_reg[table_index + 1] - x1));
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} while (--n); /* inner loop */
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susp->origin = origin_reg;
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/* using sin_ptr_reg is a bad idea on RS/6000: */
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susp->sin_ptr += togo;
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out_ptr += togo;
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susp_took(sin_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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} /* shape_s_fetch */
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void shape_toss_fetch(snd_susp_type a_susp, snd_list_type snd_list)
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{
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shape_susp_type susp = (shape_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 sin up to final_time for this block of zeros */
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while ((round((final_time - susp->sin->t0) * susp->sin->sr)) >=
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susp->sin->current)
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susp_get_samples(sin, sin_ptr, sin_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 = round((final_time - susp->sin->t0) * susp->sin->sr -
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(susp->sin->current - susp->sin_cnt));
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susp->sin_ptr += n;
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susp_took(sin_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 shape_mark(snd_susp_type a_susp)
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{
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shape_susp_type susp = (shape_susp_type) a_susp;
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sound_xlmark(susp->sin);
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}
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void shape_free(snd_susp_type a_susp)
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{
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shape_susp_type susp = (shape_susp_type) a_susp;
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table_unref(susp->the_table);
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sound_unref(susp->sin);
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ffree_generic(susp, sizeof(shape_susp_node), "shape_free");
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}
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void shape_print_tree(snd_susp_type a_susp, int n)
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{
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shape_susp_type susp = (shape_susp_type) a_susp;
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indent(n);
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stdputstr("sin:");
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sound_print_tree_1(susp->sin, n);
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}
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sound_type snd_make_shape(sound_type sin, sound_type fn, double origin)
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{
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register shape_susp_type susp;
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rate_type sr = sin->sr;
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time_type t0 = sin->t0;
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sample_type scale_factor = 1.0F;
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time_type t0_min = t0;
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falloc_generic(susp, shape_susp_node, "snd_make_shape");
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susp->time_to_index = fn->sr;
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susp->origin = origin;
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susp->the_table = sound_to_table(fn);
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susp->fcn_table = susp->the_table->samples;
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susp->table_len = susp->the_table->length;
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susp->susp.fetch = shape_s_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 < sin->t0) sound_prepend_zeros(sin, t0);
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/* minimum start time over all inputs: */
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t0_min = min(sin->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 = shape_toss_fetch;
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}
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/* initialize susp state */
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susp->susp.free = shape_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = shape_mark;
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susp->susp.print_tree = shape_print_tree;
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susp->susp.name = "shape";
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susp->logically_stopped = false;
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susp->susp.log_stop_cnt = logical_stop_cnt_cvt(sin);
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susp->susp.current = 0;
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susp->sin = sin;
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susp->sin_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_shape(sound_type sin, sound_type fn, double origin)
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{
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sound_type sin_copy = sound_copy(sin);
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return snd_make_shape(sin_copy, fn, origin);
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}
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