mirror of
https://github.com/cookiengineer/audacity
synced 2025-05-05 06:09:47 +02:00
511 lines
16 KiB
C
511 lines
16 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 "sampler.h"
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void sampler_free();
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typedef struct sampler_susp_struct {
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snd_susp_node susp;
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boolean started;
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long terminate_cnt;
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boolean logically_stopped;
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sound_type s_fm;
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long s_fm_cnt;
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sample_block_values_type s_fm_ptr;
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/* support for interpolation of s_fm */
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sample_type s_fm_x1_sample;
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double s_fm_pHaSe;
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double s_fm_pHaSe_iNcR;
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/* support for ramp between samples of s_fm */
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double output_per_s_fm;
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long s_fm_n;
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double loop_to;
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table_type the_table;
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sample_type *table_ptr;
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double table_len;
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double phase;
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double ph_incr;
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} sampler_susp_node, *sampler_susp_type;
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void sampler_s_fetch(register sampler_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 loop_to_reg;
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register sample_type * table_ptr_reg;
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register double table_len_reg;
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register double phase_reg;
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register double ph_incr_reg;
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register sample_type s_fm_scale_reg = susp->s_fm->scale;
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register sample_block_values_type s_fm_ptr_reg;
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falloc_sample_block(out, "sampler_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_fm input sample block: */
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susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt);
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togo = min(togo, susp->s_fm_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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loop_to_reg = susp->loop_to;
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table_ptr_reg = susp->table_ptr;
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table_len_reg = susp->table_len;
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phase_reg = susp->phase;
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ph_incr_reg = susp->ph_incr;
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s_fm_ptr_reg = susp->s_fm_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 table_index;
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double x1;
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table_index = (long) phase_reg;
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x1 = table_ptr_reg[table_index];
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*out_ptr_reg++ = (sample_type) (x1 + (phase_reg - table_index) *
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(table_ptr_reg[table_index + 1] - x1));
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phase_reg += ph_incr_reg + (s_fm_scale_reg * *s_fm_ptr_reg++);
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while (phase_reg > table_len_reg) phase_reg -= (table_len_reg - loop_to_reg);
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/* watch out for negative frequencies! */
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if (phase_reg < 0) phase_reg = 0;
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} while (--n); /* inner loop */
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susp->phase = phase_reg;
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/* using s_fm_ptr_reg is a bad idea on RS/6000: */
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susp->s_fm_ptr += togo;
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out_ptr += togo;
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susp_took(s_fm_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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} /* sampler_s_fetch */
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void sampler_i_fetch(register sampler_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 loop_to_reg;
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register sample_type * table_ptr_reg;
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register double table_len_reg;
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register double phase_reg;
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register double ph_incr_reg;
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register double s_fm_pHaSe_iNcR_rEg = susp->s_fm_pHaSe_iNcR;
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register double s_fm_pHaSe_ReG;
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register sample_type s_fm_x1_sample_reg;
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falloc_sample_block(out, "sampler_i_fetch");
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out_ptr = out->samples;
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snd_list->block = out;
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/* make sure sounds are primed with first values */
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if (!susp->started) {
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susp->started = true;
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susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt);
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susp->s_fm_x1_sample = susp_fetch_sample(s_fm, s_fm_ptr, s_fm_cnt);
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}
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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 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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loop_to_reg = susp->loop_to;
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table_ptr_reg = susp->table_ptr;
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table_len_reg = susp->table_len;
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phase_reg = susp->phase;
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ph_incr_reg = susp->ph_incr;
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s_fm_pHaSe_ReG = susp->s_fm_pHaSe;
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s_fm_x1_sample_reg = susp->s_fm_x1_sample;
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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 table_index;
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double x1;
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if (s_fm_pHaSe_ReG >= 1.0) {
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/* fixup-depends s_fm */
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/* pick up next sample as s_fm_x1_sample: */
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susp->s_fm_ptr++;
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susp_took(s_fm_cnt, 1);
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s_fm_pHaSe_ReG -= 1.0;
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susp_check_term_log_samples_break(s_fm, s_fm_ptr, s_fm_cnt, s_fm_x1_sample_reg);
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s_fm_x1_sample_reg = susp_current_sample(s_fm, s_fm_ptr);
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}
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table_index = (long) phase_reg;
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x1 = table_ptr_reg[table_index];
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*out_ptr_reg++ = (sample_type) (x1 + (phase_reg - table_index) *
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(table_ptr_reg[table_index + 1] - x1));
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phase_reg += ph_incr_reg + s_fm_x1_sample_reg;
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while (phase_reg > table_len_reg) phase_reg -= (table_len_reg - loop_to_reg);
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/* watch out for negative frequencies! */
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if (phase_reg < 0) phase_reg = 0;
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s_fm_pHaSe_ReG += s_fm_pHaSe_iNcR_rEg;
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} while (--n); /* inner loop */
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togo -= n;
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susp->phase = phase_reg;
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susp->s_fm_pHaSe = s_fm_pHaSe_ReG;
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susp->s_fm_x1_sample = s_fm_x1_sample_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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/* 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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} /* sampler_i_fetch */
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void sampler_r_fetch(register sampler_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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sample_type s_fm_val;
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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 loop_to_reg;
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register sample_type * table_ptr_reg;
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register double table_len_reg;
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register double phase_reg;
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register double ph_incr_reg;
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falloc_sample_block(out, "sampler_r_fetch");
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out_ptr = out->samples;
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snd_list->block = out;
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/* make sure sounds are primed with first values */
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if (!susp->started) {
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susp->started = true;
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susp->s_fm_pHaSe = 1.0;
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}
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susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt);
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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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/* grab next s_fm_x1_sample when phase goes past 1.0; */
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/* use s_fm_n (computed below) to avoid roundoff errors: */
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if (susp->s_fm_n <= 0) {
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susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt);
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susp->s_fm_x1_sample = susp_fetch_sample(s_fm, s_fm_ptr, s_fm_cnt);
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susp->s_fm_pHaSe -= 1.0;
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/* s_fm_n gets number of samples before phase exceeds 1.0: */
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susp->s_fm_n = (long) ((1.0 - susp->s_fm_pHaSe) *
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susp->output_per_s_fm);
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}
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togo = min(togo, susp->s_fm_n);
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s_fm_val = susp->s_fm_x1_sample;
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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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loop_to_reg = susp->loop_to;
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table_ptr_reg = susp->table_ptr;
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table_len_reg = susp->table_len;
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phase_reg = susp->phase;
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ph_incr_reg = susp->ph_incr;
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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 table_index;
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double x1;
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table_index = (long) phase_reg;
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x1 = table_ptr_reg[table_index];
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*out_ptr_reg++ = (sample_type) (x1 + (phase_reg - table_index) *
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(table_ptr_reg[table_index + 1] - x1));
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phase_reg += ph_incr_reg + s_fm_val;
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while (phase_reg > table_len_reg) phase_reg -= (table_len_reg - loop_to_reg);
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/* watch out for negative frequencies! */
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if (phase_reg < 0) phase_reg = 0;
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} while (--n); /* inner loop */
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susp->phase = phase_reg;
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out_ptr += togo;
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susp->s_fm_pHaSe += togo * susp->s_fm_pHaSe_iNcR;
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susp->s_fm_n -= 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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} /* sampler_r_fetch */
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void sampler_toss_fetch(susp, snd_list)
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register sampler_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_fm up to final_time for this block of zeros */
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while ((round((final_time - susp->s_fm->t0) * susp->s_fm->sr)) >=
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susp->s_fm->current)
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susp_get_samples(s_fm, s_fm_ptr, s_fm_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_fm->t0) * susp->s_fm->sr -
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(susp->s_fm->current - susp->s_fm_cnt));
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susp->s_fm_ptr += n;
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susp_took(s_fm_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 sampler_mark(sampler_susp_type susp)
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{
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sound_xlmark(susp->s_fm);
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}
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void sampler_free(sampler_susp_type susp)
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{
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table_unref(susp->the_table);
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sound_unref(susp->s_fm);
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ffree_generic(susp, sizeof(sampler_susp_node), "sampler_free");
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}
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void sampler_print_tree(sampler_susp_type susp, int n)
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{
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indent(n);
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stdputstr("s_fm:");
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sound_print_tree_1(susp->s_fm, n);
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}
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sound_type snd_make_sampler(sound_type s, double step, double loop_start, rate_type sr, double hz, time_type t0, sound_type s_fm, long npoints)
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{
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register sampler_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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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, sampler_susp_node, "snd_make_sampler");
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susp->loop_to = loop_start * s->sr;
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susp->the_table = sound_to_table(s);
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susp->table_ptr = susp->the_table->samples;
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susp->table_len = susp->the_table->length;
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{ long index = (long) susp->loop_to;
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double frac = susp->loop_to - index;
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if (index > round(susp->table_len) ||
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index < 0) {
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index = 0;
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frac = 0;
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}
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susp->table_ptr[round(susp->table_len)] = /* copy interpolated start to last entry */
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(sample_type) (susp->table_ptr[index] * (1.0 - frac) +
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susp->table_ptr[index + 1] * frac);};
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susp->phase = 0.0;
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susp->ph_incr = (s->sr / sr) * hz / step_to_hz(step);
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s_fm->scale = (sample_type) (s_fm->scale * (susp->ph_incr / hz));
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/* select a susp fn based on sample rates */
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interp_desc = (interp_desc << 2) + interp_style(s_fm, sr);
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switch (interp_desc) {
|
|
case INTERP_n: /* handled below */
|
|
case INTERP_s: susp->susp.fetch = sampler_s_fetch; break;
|
|
case INTERP_i: susp->susp.fetch = sampler_i_fetch; break;
|
|
case INTERP_r: susp->susp.fetch = sampler_r_fetch; break;
|
|
default: snd_badsr(); break;
|
|
}
|
|
|
|
susp->terminate_cnt = UNKNOWN;
|
|
/* handle unequal start times, if any */
|
|
if (t0 < s_fm->t0) sound_prepend_zeros(s_fm, t0);
|
|
/* minimum start time over all inputs: */
|
|
t0_min = min(s_fm->t0, t0);
|
|
/* how many samples to toss before t0: */
|
|
susp->susp.toss_cnt = (long) ((t0 - t0_min) * sr + 0.5);
|
|
if (susp->susp.toss_cnt > 0) {
|
|
susp->susp.keep_fetch = susp->susp.fetch;
|
|
susp->susp.fetch = sampler_toss_fetch;
|
|
}
|
|
|
|
/* initialize susp state */
|
|
susp->susp.free = sampler_free;
|
|
susp->susp.sr = sr;
|
|
susp->susp.t0 = t0;
|
|
susp->susp.mark = sampler_mark;
|
|
susp->susp.print_tree = sampler_print_tree;
|
|
susp->susp.name = "sampler";
|
|
susp->logically_stopped = false;
|
|
susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s_fm);
|
|
susp->started = false;
|
|
susp->susp.current = 0;
|
|
susp->s_fm = s_fm;
|
|
susp->s_fm_cnt = 0;
|
|
susp->s_fm_pHaSe = 0.0;
|
|
susp->s_fm_pHaSe_iNcR = s_fm->sr / sr;
|
|
susp->s_fm_n = 0;
|
|
susp->output_per_s_fm = sr / s_fm->sr;
|
|
return sound_create((snd_susp_type)susp, t0, sr, scale_factor);
|
|
}
|
|
|
|
|
|
sound_type snd_sampler(sound_type s, double step, double loop_start, rate_type sr, double hz, time_type t0, sound_type s_fm, long npoints)
|
|
{
|
|
sound_type s_fm_copy = sound_copy(s_fm);
|
|
return snd_make_sampler(s, step, loop_start, sr, hz, t0, s_fm_copy, npoints);
|
|
}
|