mirror of
https://github.com/cookiengineer/audacity
synced 2025-05-05 06:09:47 +02:00
138 lines
3.4 KiB
C
138 lines
3.4 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 "fromobject.h"
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void fromobject_free(snd_susp_type a_susp);
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typedef struct fromobject_susp_struct {
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snd_susp_node susp;
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boolean done;
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LVAL src;
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} fromobject_susp_node, *fromobject_susp_type;
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/* IMPLEMENTATION NOTE:
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* The src argument is an XLisp object that returns either a
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* FLONUM sample or NIL. The output of fromobj is simply the
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* sequence of the samples.
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*/
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#include "samples.h"
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void fromobject__fetch(snd_susp_type a_susp, snd_list_type snd_list)
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{
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fromobject_susp_type susp = (fromobject_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 boolean done_reg;
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register LVAL src_reg;
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falloc_sample_block(out, "fromobject__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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if (susp->done) {
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togo = 0; /* indicate termination */
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break; /* we're done */
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}
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n = togo;
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done_reg = susp->done;
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src_reg = susp->src;
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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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LVAL rslt = xleval(cons(s_send, cons(src_reg,
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consa(s_next))));
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if (floatp(rslt)) {
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*out_ptr_reg++ = (sample_type) getflonum(rslt);
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} else {
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done_reg = true;
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/* adjust togo to what it should have been */
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break;
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};
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} while (--n); /* inner loop */
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togo -= n;
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susp->done = done_reg;
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out_ptr += 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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} /* fromobject__fetch */
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void fromobject_mark(snd_susp_type a_susp)
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{
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fromobject_susp_type susp = (fromobject_susp_type) a_susp;
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if (susp->src) mark(susp->src);
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}
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void fromobject_free(snd_susp_type a_susp)
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{
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fromobject_susp_type susp = (fromobject_susp_type) a_susp;
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ffree_generic(susp, sizeof(fromobject_susp_node), "fromobject_free");
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}
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void fromobject_print_tree(snd_susp_type a_susp, int n)
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{
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}
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sound_type snd_make_fromobject(time_type t0, rate_type sr, LVAL src)
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{
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register fromobject_susp_type susp;
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/* sr specified as input parameter */
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/* t0 specified as input parameter */
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sample_type scale_factor = 1.0F;
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falloc_generic(susp, fromobject_susp_node, "snd_make_fromobject");
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susp->done = false;
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susp->src = src;
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susp->susp.fetch = fromobject__fetch;
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/* initialize susp state */
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susp->susp.free = fromobject_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = fromobject_mark;
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susp->susp.print_tree = fromobject_print_tree;
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susp->susp.name = "fromobject";
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susp->susp.log_stop_cnt = UNKNOWN;
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susp->susp.current = 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_fromobject(time_type t0, rate_type sr, LVAL src)
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{
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return snd_make_fromobject(t0, sr, src);
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}
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