diff options
Diffstat (limited to 'tran/sampler.c')
| -rw-r--r-- | tran/sampler.c | 510 |
1 files changed, 510 insertions, 0 deletions
diff --git a/tran/sampler.c b/tran/sampler.c new file mode 100644 index 0000000..2ba3ed3 --- /dev/null +++ b/tran/sampler.c @@ -0,0 +1,510 @@ +#include "stdio.h" +#ifndef mips +#include "stdlib.h" +#endif +#include "xlisp.h" +#include "sound.h" + +#include "falloc.h" +#include "cext.h" +#include "sampler.h" + +void sampler_free(); + + +typedef struct sampler_susp_struct { + snd_susp_node susp; + boolean started; + long terminate_cnt; + boolean logically_stopped; + sound_type s_fm; + long s_fm_cnt; + sample_block_values_type s_fm_ptr; + + /* support for interpolation of s_fm */ + sample_type s_fm_x1_sample; + double s_fm_pHaSe; + double s_fm_pHaSe_iNcR; + + /* support for ramp between samples of s_fm */ + double output_per_s_fm; + long s_fm_n; + + double loop_to; + table_type the_table; + sample_type *table_ptr; + double table_len; + double phase; + double ph_incr; +} sampler_susp_node, *sampler_susp_type; + + +void sampler_s_fetch(register sampler_susp_type susp, snd_list_type snd_list) +{ + int cnt = 0; /* how many samples computed */ + int togo; + int n; + sample_block_type out; + register sample_block_values_type out_ptr; + + register sample_block_values_type out_ptr_reg; + + register double loop_to_reg; + register sample_type * table_ptr_reg; + register double table_len_reg; + register double phase_reg; + register double ph_incr_reg; + register sample_type s_fm_scale_reg = susp->s_fm->scale; + register sample_block_values_type s_fm_ptr_reg; + falloc_sample_block(out, "sampler_s_fetch"); + out_ptr = out->samples; + snd_list->block = out; + + while (cnt < max_sample_block_len) { /* outer loop */ + /* first compute how many samples to generate in inner loop: */ + /* don't overflow the output sample block: */ + togo = max_sample_block_len - cnt; + + /* don't run past the s_fm input sample block: */ + susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt); + togo = min(togo, susp->s_fm_cnt); + + /* don't run past terminate time */ + if (susp->terminate_cnt != UNKNOWN && + susp->terminate_cnt <= susp->susp.current + cnt + togo) { + togo = susp->terminate_cnt - (susp->susp.current + cnt); + if (togo == 0) break; + } + + + /* don't run past logical stop time */ + if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) { + int to_stop = susp->susp.log_stop_cnt - (susp->susp.current + cnt); + /* break if to_stop == 0 (we're at the logical stop) + * AND cnt > 0 (we're not at the beginning of the + * output block). + */ + if (to_stop < togo) { + if (to_stop == 0) { + if (cnt) { + togo = 0; + break; + } else /* keep togo as is: since cnt == 0, we + * can set the logical stop flag on this + * output block + */ + susp->logically_stopped = true; + } else /* limit togo so we can start a new + * block at the LST + */ + togo = to_stop; + } + } + + n = togo; + loop_to_reg = susp->loop_to; + table_ptr_reg = susp->table_ptr; + table_len_reg = susp->table_len; + phase_reg = susp->phase; + ph_incr_reg = susp->ph_incr; + s_fm_ptr_reg = susp->s_fm_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ + long table_index; + double x1; +table_index = (long) phase_reg; + x1 = table_ptr_reg[table_index]; + *out_ptr_reg++ = (sample_type) (x1 + (phase_reg - table_index) * + (table_ptr_reg[table_index + 1] - x1)); + phase_reg += ph_incr_reg + (s_fm_scale_reg * *s_fm_ptr_reg++); + while (phase_reg > table_len_reg) phase_reg -= (table_len_reg - loop_to_reg); + /* watch out for negative frequencies! */ + if (phase_reg < 0) phase_reg = 0; + } while (--n); /* inner loop */ + + susp->phase = phase_reg; + /* using s_fm_ptr_reg is a bad idea on RS/6000: */ + susp->s_fm_ptr += togo; + out_ptr += togo; + susp_took(s_fm_cnt, togo); + cnt += togo; + } /* outer loop */ + + /* test for termination */ + if (togo == 0 && cnt == 0) { + snd_list_terminate(snd_list); + } else { + snd_list->block_len = cnt; + susp->susp.current += cnt; + } + /* test for logical stop */ + if (susp->logically_stopped) { + snd_list->logically_stopped = true; + } else if (susp->susp.log_stop_cnt == susp->susp.current) { + susp->logically_stopped = true; + } +} /* sampler_s_fetch */ + + +void sampler_i_fetch(register sampler_susp_type susp, snd_list_type snd_list) +{ + int cnt = 0; /* how many samples computed */ + int togo; + int n; + sample_block_type out; + register sample_block_values_type out_ptr; + + register sample_block_values_type out_ptr_reg; + + register double loop_to_reg; + register sample_type * table_ptr_reg; + register double table_len_reg; + register double phase_reg; + register double ph_incr_reg; + register double s_fm_pHaSe_iNcR_rEg = susp->s_fm_pHaSe_iNcR; + register double s_fm_pHaSe_ReG; + register sample_type s_fm_x1_sample_reg; + falloc_sample_block(out, "sampler_i_fetch"); + out_ptr = out->samples; + snd_list->block = out; + + /* make sure sounds are primed with first values */ + if (!susp->started) { + susp->started = true; + susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt); + susp->s_fm_x1_sample = susp_fetch_sample(s_fm, s_fm_ptr, s_fm_cnt); + } + + while (cnt < max_sample_block_len) { /* outer loop */ + /* first compute how many samples to generate in inner loop: */ + /* don't overflow the output sample block: */ + togo = max_sample_block_len - cnt; + + /* don't run past terminate time */ + if (susp->terminate_cnt != UNKNOWN && + susp->terminate_cnt <= susp->susp.current + cnt + togo) { + togo = susp->terminate_cnt - (susp->susp.current + cnt); + if (togo == 0) break; + } + + + /* don't run past logical stop time */ + if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) { + int to_stop = susp->susp.log_stop_cnt - (susp->susp.current + cnt); + /* break if to_stop == 0 (we're at the logical stop) + * AND cnt > 0 (we're not at the beginning of the + * output block). + */ + if (to_stop < togo) { + if (to_stop == 0) { + if (cnt) { + togo = 0; + break; + } else /* keep togo as is: since cnt == 0, we + * can set the logical stop flag on this + * output block + */ + susp->logically_stopped = true; + } else /* limit togo so we can start a new + * block at the LST + */ + togo = to_stop; + } + } + + n = togo; + loop_to_reg = susp->loop_to; + table_ptr_reg = susp->table_ptr; + table_len_reg = susp->table_len; + phase_reg = susp->phase; + ph_incr_reg = susp->ph_incr; + s_fm_pHaSe_ReG = susp->s_fm_pHaSe; + s_fm_x1_sample_reg = susp->s_fm_x1_sample; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ + long table_index; + double x1; + if (s_fm_pHaSe_ReG >= 1.0) { +/* fixup-depends s_fm */ + /* pick up next sample as s_fm_x1_sample: */ + susp->s_fm_ptr++; + susp_took(s_fm_cnt, 1); + s_fm_pHaSe_ReG -= 1.0; + susp_check_term_log_samples_break(s_fm, s_fm_ptr, s_fm_cnt, s_fm_x1_sample_reg); + s_fm_x1_sample_reg = susp_current_sample(s_fm, s_fm_ptr); + } +table_index = (long) phase_reg; + x1 = table_ptr_reg[table_index]; + *out_ptr_reg++ = (sample_type) (x1 + (phase_reg - table_index) * + (table_ptr_reg[table_index + 1] - x1)); + phase_reg += ph_incr_reg + s_fm_x1_sample_reg; + while (phase_reg > table_len_reg) phase_reg -= (table_len_reg - loop_to_reg); + /* watch out for negative frequencies! */ + if (phase_reg < 0) phase_reg = 0; + s_fm_pHaSe_ReG += s_fm_pHaSe_iNcR_rEg; + } while (--n); /* inner loop */ + + togo -= n; + susp->phase = phase_reg; + susp->s_fm_pHaSe = s_fm_pHaSe_ReG; + susp->s_fm_x1_sample = s_fm_x1_sample_reg; + out_ptr += togo; + cnt += togo; + } /* outer loop */ + + /* test for termination */ + if (togo == 0 && cnt == 0) { + snd_list_terminate(snd_list); + } else { + snd_list->block_len = cnt; + susp->susp.current += cnt; + } + /* test for logical stop */ + if (susp->logically_stopped) { + snd_list->logically_stopped = true; + } else if (susp->susp.log_stop_cnt == susp->susp.current) { + susp->logically_stopped = true; + } +} /* sampler_i_fetch */ + + +void sampler_r_fetch(register sampler_susp_type susp, snd_list_type snd_list) +{ + int cnt = 0; /* how many samples computed */ + sample_type s_fm_val; + int togo; + int n; + sample_block_type out; + register sample_block_values_type out_ptr; + + register sample_block_values_type out_ptr_reg; + + register double loop_to_reg; + register sample_type * table_ptr_reg; + register double table_len_reg; + register double phase_reg; + register double ph_incr_reg; + falloc_sample_block(out, "sampler_r_fetch"); + out_ptr = out->samples; + snd_list->block = out; + + /* make sure sounds are primed with first values */ + if (!susp->started) { + susp->started = true; + susp->s_fm_pHaSe = 1.0; + } + + susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt); + + while (cnt < max_sample_block_len) { /* outer loop */ + /* first compute how many samples to generate in inner loop: */ + /* don't overflow the output sample block: */ + togo = max_sample_block_len - cnt; + + /* grab next s_fm_x1_sample when phase goes past 1.0; */ + /* use s_fm_n (computed below) to avoid roundoff errors: */ + if (susp->s_fm_n <= 0) { + susp_check_term_log_samples(s_fm, s_fm_ptr, s_fm_cnt); + susp->s_fm_x1_sample = susp_fetch_sample(s_fm, s_fm_ptr, s_fm_cnt); + susp->s_fm_pHaSe -= 1.0; + /* s_fm_n gets number of samples before phase exceeds 1.0: */ + susp->s_fm_n = (long) ((1.0 - susp->s_fm_pHaSe) * + susp->output_per_s_fm); + } + togo = min(togo, susp->s_fm_n); + s_fm_val = susp->s_fm_x1_sample; + /* don't run past terminate time */ + if (susp->terminate_cnt != UNKNOWN && + susp->terminate_cnt <= susp->susp.current + cnt + togo) { + togo = susp->terminate_cnt - (susp->susp.current + cnt); + if (togo == 0) break; + } + + + /* don't run past logical stop time */ + if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) { + int to_stop = susp->susp.log_stop_cnt - (susp->susp.current + cnt); + /* break if to_stop == 0 (we're at the logical stop) + * AND cnt > 0 (we're not at the beginning of the + * output block). + */ + if (to_stop < togo) { + if (to_stop == 0) { + if (cnt) { + togo = 0; + break; + } else /* keep togo as is: since cnt == 0, we + * can set the logical stop flag on this + * output block + */ + susp->logically_stopped = true; + } else /* limit togo so we can start a new + * block at the LST + */ + togo = to_stop; + } + } + + n = togo; + loop_to_reg = susp->loop_to; + table_ptr_reg = susp->table_ptr; + table_len_reg = susp->table_len; + phase_reg = susp->phase; + ph_incr_reg = susp->ph_incr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ + long table_index; + double x1; +table_index = (long) phase_reg; + x1 = table_ptr_reg[table_index]; + *out_ptr_reg++ = (sample_type) (x1 + (phase_reg - table_index) * + (table_ptr_reg[table_index + 1] - x1)); + phase_reg += ph_incr_reg + s_fm_val; + while (phase_reg > table_len_reg) phase_reg -= (table_len_reg - loop_to_reg); + /* watch out for negative frequencies! */ + if (phase_reg < 0) phase_reg = 0; + } while (--n); /* inner loop */ + + susp->phase = phase_reg; + out_ptr += togo; + susp->s_fm_pHaSe += togo * susp->s_fm_pHaSe_iNcR; + susp->s_fm_n -= togo; + cnt += togo; + } /* outer loop */ + + /* test for termination */ + if (togo == 0 && cnt == 0) { + snd_list_terminate(snd_list); + } else { + snd_list->block_len = cnt; + susp->susp.current += cnt; + } + /* test for logical stop */ + if (susp->logically_stopped) { + snd_list->logically_stopped = true; + } else if (susp->susp.log_stop_cnt == susp->susp.current) { + susp->logically_stopped = true; + } +} /* sampler_r_fetch */ + + +void sampler_toss_fetch(susp, snd_list) + register sampler_susp_type susp; + snd_list_type snd_list; +{ + long final_count = susp->susp.toss_cnt; + time_type final_time = susp->susp.t0; + long n; + + /* fetch samples from s_fm up to final_time for this block of zeros */ + while ((round((final_time - susp->s_fm->t0) * susp->s_fm->sr)) >= + susp->s_fm->current) + susp_get_samples(s_fm, s_fm_ptr, s_fm_cnt); + /* convert to normal processing when we hit final_count */ + /* we want each signal positioned at final_time */ + n = round((final_time - susp->s_fm->t0) * susp->s_fm->sr - + (susp->s_fm->current - susp->s_fm_cnt)); + susp->s_fm_ptr += n; + susp_took(s_fm_cnt, n); + susp->susp.fetch = susp->susp.keep_fetch; + (*(susp->susp.fetch))(susp, snd_list); +} + + +void sampler_mark(sampler_susp_type susp) +{ + sound_xlmark(susp->s_fm); +} + + +void sampler_free(sampler_susp_type susp) +{ + table_unref(susp->the_table); + sound_unref(susp->s_fm); + ffree_generic(susp, sizeof(sampler_susp_node), "sampler_free"); +} + + +void sampler_print_tree(sampler_susp_type susp, int n) +{ + indent(n); + stdputstr("s_fm:"); + sound_print_tree_1(susp->s_fm, n); +} + + +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) +{ + register sampler_susp_type susp; + /* sr specified as input parameter */ + /* t0 specified as input parameter */ + int interp_desc = 0; + sample_type scale_factor = 1.0F; + time_type t0_min = t0; + falloc_generic(susp, sampler_susp_node, "snd_make_sampler"); + susp->loop_to = loop_start * s->sr; + susp->the_table = sound_to_table(s); + susp->table_ptr = susp->the_table->samples; + susp->table_len = susp->the_table->length; + { long index = (long) susp->loop_to; + double frac = susp->loop_to - index; + if (index > round(susp->table_len) || + index < 0) { + index = 0; + frac = 0; + } + susp->table_ptr[round(susp->table_len)] = /* copy interpolated start to last entry */ + (sample_type) (susp->table_ptr[index] * (1.0 - frac) + + susp->table_ptr[index + 1] * frac);}; + susp->phase = 0.0; + susp->ph_incr = (s->sr / sr) * hz / step_to_hz(step); + s_fm->scale = (sample_type) (s_fm->scale * (susp->ph_incr / hz)); + + /* select a susp fn based on sample rates */ + interp_desc = (interp_desc << 2) + interp_style(s_fm, sr); + 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); +} |