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https://github.com/cookiengineer/audacity
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Move library tree where it belongs
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ra
300
lib-src/libnyquist/nyquist/nyqsrc/convolve.c
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300
lib-src/libnyquist/nyquist/nyqsrc/convolve.c
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/* convolve.c -- implements (non-"fast") convolution */
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/*
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* Note: this code is mostly generated by translate.lsp (see convole.tran
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* in the tran directory), but it has been modified by hand to extend the
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* stop time to include the "tail" of the convolution beyond the length
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* of the first parameter.
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*/
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#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 "convolve.h"
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void convolve_free();
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typedef struct convolve_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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table_type table;
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sample_type *h_buf;
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double length_of_h;
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long h_len;
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long x_buf_len;
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sample_type *x_buffer_pointer;
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sample_type *x_buffer_current;
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} convolve_susp_node, *convolve_susp_type;
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void h_reverse(sample_type *h, long len)
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{
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sample_type temp;
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int i;
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for (i = 0; i < len; i++) {
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temp = h[i];
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h[i] = h[len - 1];
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h[len - 1] = temp;
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len--;
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}
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}
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void convolve_s_fetch(register convolve_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 sample_type * h_buf_reg;
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register long h_len_reg;
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register long x_buf_len_reg;
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register sample_type * x_buffer_pointer_reg;
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register sample_type * x_buffer_current_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, "convolve_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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/* based on susp_check_term_log_samples, but offset by h_len */
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/* THIS IS EXPANDED BELOW
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* susp_check_term_log_samples(x_snd, x_snd_ptr, x_snd_cnt);
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*/
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if (susp->x_snd_cnt == 0) {
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susp_get_samples(x_snd, x_snd_ptr, x_snd_cnt);
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/* THIS IS EXPANDED BELOW
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*logical_stop_test(x_snd, susp->x_snd_cnt);
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*/
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if (susp->x_snd->logical_stop_cnt ==
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susp->x_snd->current - susp->x_snd_cnt) {
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min_cnt(&susp->susp.log_stop_cnt, susp->x_snd,
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(snd_susp_type) susp, susp->x_snd_cnt);
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}
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/* THIS IS EXPANDED BELOW
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* terminate_test(x_snd_ptr, x_snd, susp->x_snd_cnt);
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*/
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if (susp->x_snd_ptr == zero_block->samples) {
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/* ### modify this to terminate at an offset of (susp->h_len) */
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/* Note: in the min_cnt function, susp->x_snd_cnt is *subtracted*
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* from susp->x_snd->current to form the terminate time, so to
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* increase the time, we need to *subtract* susp->h_len, which
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* due to the double negative, *adds* susp->h_len to the ultimate
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* terminate time calculation.
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*/
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min_cnt(&susp->terminate_cnt, susp->x_snd,
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(snd_susp_type) susp, susp->x_snd_cnt - susp->h_len);
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}
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}
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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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n = togo;
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h_buf_reg = susp->h_buf;
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h_len_reg = susp->h_len;
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x_buf_len_reg = susp->x_buf_len;
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x_buffer_pointer_reg = susp->x_buffer_pointer;
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x_buffer_current_reg = susp->x_buffer_current;
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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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long i; double sum;
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/* see if we've reached end of x_buffer */
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if ((x_buffer_pointer_reg + x_buf_len_reg) <= (x_buffer_current_reg + h_len_reg)) {
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/* shift x_buffer from current back to base */
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for (i = 1; i < h_len_reg; i++) {
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x_buffer_pointer_reg[i-1] = x_buffer_current_reg[i];
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}
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/* this will be incremented back to x_buffer_pointer_reg below */
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x_buffer_current_reg = x_buffer_pointer_reg - 1;
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}
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x_buffer_current_reg++;
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x_buffer_current_reg[h_len_reg - 1] = (x_snd_scale_reg * *x_snd_ptr_reg++);
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sum = 0.0;
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for (i = 0; i < h_len_reg; i++) {
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sum += x_buffer_current_reg[i] * h_buf_reg[i];
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}
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*out_ptr_reg++ = (sample_type) sum;
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} while (--n); /* inner loop */
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susp->x_buffer_pointer = x_buffer_pointer_reg;
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susp->x_buffer_current = x_buffer_current_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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} /* convolve_s_fetch */
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void convolve_toss_fetch(susp, snd_list)
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register convolve_susp_type susp;
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snd_list_type snd_list;
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{
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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 convolve_mark(convolve_susp_type susp)
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{
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sound_xlmark(susp->x_snd);
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}
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void convolve_free(convolve_susp_type susp)
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{
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table_unref(susp->table);
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free(susp->x_buffer_pointer); sound_unref(susp->x_snd);
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ffree_generic(susp, sizeof(convolve_susp_node), "convolve_free");
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}
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void convolve_print_tree(convolve_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_convolve(sound_type x_snd, sound_type h_snd)
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{
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register convolve_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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sample_type scale_factor = 1.0F;
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time_type t0_min = t0;
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falloc_generic(susp, convolve_susp_node, "snd_make_convolve");
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susp->table = sound_to_table(h_snd);
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susp->h_buf = susp->table->samples;
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susp->length_of_h = susp->table->length;
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susp->h_len = (long) susp->length_of_h;
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h_reverse(susp->h_buf, susp->h_len);
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susp->x_buf_len = 2 * susp->h_len;
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susp->x_buffer_pointer = calloc((2 * (susp->h_len)), sizeof(float));
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susp->x_buffer_current = susp->x_buffer_pointer;
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susp->susp.fetch = convolve_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 = convolve_toss_fetch;
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}
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/* initialize susp state */
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susp->susp.free = convolve_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = convolve_mark;
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susp->susp.print_tree = convolve_print_tree;
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susp->susp.name = "convolve";
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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_convolve(sound_type x_snd, sound_type h_snd)
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{
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sound_type x_snd_copy = sound_copy(x_snd);
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return snd_make_convolve(x_snd_copy, h_snd);
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}
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