mirror of
https://github.com/cookiengineer/audacity
synced 2025-05-05 14:18:53 +02:00
265 lines
7.7 KiB
C
265 lines
7.7 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 "allpoles.h"
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void allpoles_free();
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typedef struct allpoles_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 x_snd;
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long x_snd_cnt;
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sample_block_values_type x_snd_ptr;
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long ak_len;
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LVAL ak_array;
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double gain;
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double *ak_coefs;
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double *zk_buf;
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long index;
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} allpoles_susp_node, *allpoles_susp_type;
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void allpoles_s_fetch(register allpoles_susp_type susp, snd_list_type snd_list)
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{
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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 long ak_len_reg;
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register double gain_reg;
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register double * ak_coefs_reg;
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register double * zk_buf_reg;
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register long index_reg;
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register sample_type x_snd_scale_reg = susp->x_snd->scale;
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register sample_block_values_type x_snd_ptr_reg;
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falloc_sample_block(out, "allpoles_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 x_snd input sample block: */
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susp_check_term_log_samples(x_snd, x_snd_ptr, x_snd_cnt);
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togo = min(togo, susp->x_snd_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) 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 < 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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if (susp->ak_array == NULL) {
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togo = 0; /* indicate termination */
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break; /* we're done */
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}
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else if (!vectorp(susp->ak_array))
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xlerror("array expected", susp->ak_array);
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else if (susp->ak_coefs == NULL)
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{
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long i;
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susp->ak_len = getsize(susp->ak_array);
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if (susp->ak_len < 1) xlerror("array has not elements", susp->ak_array);
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susp->ak_coefs = (double *) calloc(susp->ak_len, sizeof(double));
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susp->zk_buf = (double *) calloc(susp->ak_len, sizeof(double));
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/* at this point we have a new array and a place to put ak coefs */
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for(i=0; i < susp->ak_len; i++) {
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LVAL elem = getelement(susp->ak_array,i);
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if (ntype(elem) != FLONUM) {
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xlerror("flonum expected", elem);
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}
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susp->ak_coefs[i] = getflonum(elem);
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}
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}
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n = togo;
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ak_len_reg = susp->ak_len;
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gain_reg = susp->gain;
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ak_coefs_reg = susp->ak_coefs;
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zk_buf_reg = susp->zk_buf;
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index_reg = susp->index;
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x_snd_ptr_reg = susp->x_snd_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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double z0; long xi; long xj;
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z0 = (x_snd_scale_reg * *x_snd_ptr_reg++)*gain_reg;
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for (xi=0; xi < ak_len_reg ; xi++)
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{
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xj = index_reg + xi; if (xj >= ak_len_reg) xj -= ak_len_reg;
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z0 += ak_coefs_reg[xi] * zk_buf_reg[xj];
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}
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zk_buf_reg[index_reg] = z0;
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index_reg++; if (index_reg == ak_len_reg) index_reg = 0;
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*out_ptr_reg++ = (sample_type) z0;
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;
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} while (--n); /* inner loop */
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susp->zk_buf = zk_buf_reg;
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susp->index = index_reg;
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/* using x_snd_ptr_reg is a bad idea on RS/6000: */
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susp->x_snd_ptr += togo;
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out_ptr += togo;
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susp_took(x_snd_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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} /* allpoles_s_fetch */
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void allpoles_toss_fetch(susp, snd_list)
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register allpoles_susp_type susp;
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snd_list_type snd_list;
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{
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long final_count = susp->susp.toss_cnt;
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time_type final_time = susp->susp.t0;
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long n;
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/* fetch samples from x_snd up to final_time for this block of zeros */
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while ((round((final_time - susp->x_snd->t0) * susp->x_snd->sr)) >=
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susp->x_snd->current)
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susp_get_samples(x_snd, x_snd_ptr, x_snd_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->x_snd->t0) * susp->x_snd->sr -
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(susp->x_snd->current - susp->x_snd_cnt));
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susp->x_snd_ptr += n;
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susp_took(x_snd_cnt, n);
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susp->susp.fetch = susp->susp.keep_fetch;
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(*(susp->susp.fetch))(susp, snd_list);
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}
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void allpoles_mark(allpoles_susp_type susp)
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{
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if (susp->ak_array) mark(susp->ak_array);
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sound_xlmark(susp->x_snd);
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}
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void allpoles_free(allpoles_susp_type susp)
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{
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free(susp->zk_buf);
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free(susp->ak_coefs);
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susp->ak_array = NULL; /* free array */
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sound_unref(susp->x_snd);
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ffree_generic(susp, sizeof(allpoles_susp_node), "allpoles_free");
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}
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void allpoles_print_tree(allpoles_susp_type susp, int n)
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{
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indent(n);
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stdputstr("x_snd:");
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sound_print_tree_1(susp->x_snd, n);
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}
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sound_type snd_make_allpoles(sound_type x_snd, LVAL ak_array, double gain)
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{
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register allpoles_susp_type susp;
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rate_type sr = x_snd->sr;
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time_type t0 = x_snd->t0;
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int interp_desc = 0;
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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, allpoles_susp_node, "snd_make_allpoles");
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susp->ak_len = 0;
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susp->ak_array = ak_array;
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susp->gain = gain;
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susp->ak_coefs = NULL;
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susp->zk_buf = NULL;
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susp->index = 0;
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susp->susp.fetch = allpoles_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 < x_snd->t0) sound_prepend_zeros(x_snd, t0);
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/* minimum start time over all inputs: */
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t0_min = min(x_snd->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 = allpoles_toss_fetch;
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}
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/* initialize susp state */
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susp->susp.free = allpoles_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = allpoles_mark;
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susp->susp.print_tree = allpoles_print_tree;
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susp->susp.name = "allpoles";
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susp->logically_stopped = false;
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susp->susp.log_stop_cnt = logical_stop_cnt_cvt(x_snd);
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susp->susp.current = 0;
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susp->x_snd = x_snd;
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susp->x_snd_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_allpoles(sound_type x_snd, LVAL ak_array, double gain)
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{
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sound_type x_snd_copy = sound_copy(x_snd);
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return snd_make_allpoles(x_snd_copy, ak_array, gain);
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}
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