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https://github.com/cookiengineer/audacity
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Move library tree where it belongs
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ra
317
lib-src/libnyquist/nyquist/tran/atone.c
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317
lib-src/libnyquist/nyquist/tran/atone.c
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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 "atone.h"
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void atone_free();
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typedef struct atone_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 s;
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long s_cnt;
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sample_block_values_type s_ptr;
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double cc;
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double prev;
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} atone_susp_node, *atone_susp_type;
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void atone_n_fetch(register atone_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 double cc_reg;
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register double prev_reg;
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register sample_block_values_type s_ptr_reg;
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falloc_sample_block(out, "atone_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 s input sample block: */
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susp_check_term_log_samples(s, s_ptr, s_cnt);
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togo = min(togo, susp->s_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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cc_reg = susp->cc;
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prev_reg = susp->prev;
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s_ptr_reg = susp->s_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 current;
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current = *s_ptr_reg++;
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prev_reg = cc_reg * (prev_reg + current); /* use prev_reg as temp variable ... */
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*out_ptr_reg++ = (float) prev_reg; /* ... so we can do proper type conversion */
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prev_reg -= current;;
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} while (--n); /* inner loop */
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susp->prev = prev_reg;
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/* using s_ptr_reg is a bad idea on RS/6000: */
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susp->s_ptr += togo;
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out_ptr += togo;
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susp_took(s_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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} /* atone_n_fetch */
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void atone_s_fetch(register atone_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 double cc_reg;
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register double prev_reg;
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register sample_type s_scale_reg = susp->s->scale;
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register sample_block_values_type s_ptr_reg;
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falloc_sample_block(out, "atone_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 s input sample block: */
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susp_check_term_log_samples(s, s_ptr, s_cnt);
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togo = min(togo, susp->s_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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cc_reg = susp->cc;
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prev_reg = susp->prev;
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s_ptr_reg = susp->s_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 current;
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current = (s_scale_reg * *s_ptr_reg++);
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prev_reg = cc_reg * (prev_reg + current); /* use prev_reg as temp variable ... */
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*out_ptr_reg++ = (float) prev_reg; /* ... so we can do proper type conversion */
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prev_reg -= current;;
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} while (--n); /* inner loop */
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susp->prev = prev_reg;
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/* using s_ptr_reg is a bad idea on RS/6000: */
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susp->s_ptr += togo;
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out_ptr += togo;
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susp_took(s_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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} /* atone_s_fetch */
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void atone_toss_fetch(susp, snd_list)
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register atone_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 s up to final_time for this block of zeros */
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while ((round((final_time - susp->s->t0) * susp->s->sr)) >=
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susp->s->current)
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susp_get_samples(s, s_ptr, s_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->s->t0) * susp->s->sr -
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(susp->s->current - susp->s_cnt));
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susp->s_ptr += n;
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susp_took(s_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 atone_mark(atone_susp_type susp)
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{
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sound_xlmark(susp->s);
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}
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void atone_free(atone_susp_type susp)
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{
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sound_unref(susp->s);
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ffree_generic(susp, sizeof(atone_susp_node), "atone_free");
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}
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void atone_print_tree(atone_susp_type susp, int n)
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{
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indent(n);
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stdputstr("s:");
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sound_print_tree_1(susp->s, n);
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}
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sound_type snd_make_atone(sound_type s, double hz)
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{
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register atone_susp_type susp;
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double bb;
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rate_type sr = s->sr;
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time_type t0 = s->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, atone_susp_node, "snd_make_atone");
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bb = 2.0 - cos(hz * PI2 / s->sr);
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susp->cc = bb - sqrt((bb * bb) - 1.0);
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susp->prev = 0.0;
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/* select a susp fn based on sample rates */
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interp_desc = (interp_desc << 2) + interp_style(s, sr);
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switch (interp_desc) {
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case INTERP_n: susp->susp.fetch = atone_n_fetch; break;
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case INTERP_s: susp->susp.fetch = atone_s_fetch; break;
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default: snd_badsr(); break;
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}
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susp->terminate_cnt = UNKNOWN;
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/* handle unequal start times, if any */
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if (t0 < s->t0) sound_prepend_zeros(s, t0);
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/* minimum start time over all inputs: */
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t0_min = min(s->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 = atone_toss_fetch;
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}
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/* initialize susp state */
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susp->susp.free = atone_free;
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susp->susp.sr = sr;
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susp->susp.t0 = t0;
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susp->susp.mark = atone_mark;
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susp->susp.print_tree = atone_print_tree;
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susp->susp.name = "atone";
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susp->logically_stopped = false;
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susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s);
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susp->susp.current = 0;
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susp->s = s;
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susp->s_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_atone(sound_type s, double hz)
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{
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sound_type s_copy = sound_copy(s);
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return snd_make_atone(s_copy, hz);
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}
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