diff options
Diffstat (limited to 'tran/upsample.c')
| -rw-r--r-- | tran/upsample.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/tran/upsample.c b/tran/upsample.c new file mode 100644 index 0000000..a83c678 --- /dev/null +++ b/tran/upsample.c @@ -0,0 +1,448 @@ +#include "stdio.h" +#ifndef mips +#include "stdlib.h" +#endif +#include "xlisp.h" +#include "sound.h" + +#include "falloc.h" +#include "cext.h" +#include "upsample.h" + +void up_free(); + + +typedef struct up_susp_struct { + snd_susp_node susp; + boolean started; + long terminate_cnt; + boolean logically_stopped; + sound_type input; + long input_cnt; + sample_block_values_type input_ptr; + + /* support for interpolation of input */ + sample_type input_x1_sample; + double input_pHaSe; + double input_pHaSe_iNcR; + + /* support for ramp between samples of input */ + double output_per_input; + long input_n; +} up_susp_node, *up_susp_type; + + +void up_n_fetch(register up_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 sample_block_values_type input_ptr_reg; + falloc_sample_block(out, "up_n_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 input input sample block: */ + susp_check_term_log_samples(input, input_ptr, input_cnt); + togo = min(togo, susp->input_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; + input_ptr_reg = susp->input_ptr; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ +*out_ptr_reg++ = (sample_type) *input_ptr_reg++; + } while (--n); /* inner loop */ + + /* using input_ptr_reg is a bad idea on RS/6000: */ + susp->input_ptr += togo; + out_ptr += togo; + susp_took(input_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; + } +} /* up_n_fetch */ + + +void up_i_fetch(register up_susp_type susp, snd_list_type snd_list) +{ + int cnt = 0; /* how many samples computed */ + sample_type input_x2_sample; + 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 input_pHaSe_iNcR_rEg = susp->input_pHaSe_iNcR; + register double input_pHaSe_ReG; + register sample_type input_x1_sample_reg; + falloc_sample_block(out, "up_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(input, input_ptr, input_cnt); + susp->input_x1_sample = susp_fetch_sample(input, input_ptr, input_cnt); + } + + susp_check_term_log_samples(input, input_ptr, input_cnt); + input_x2_sample = susp_current_sample(input, input_ptr); + + 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; + input_pHaSe_ReG = susp->input_pHaSe; + input_x1_sample_reg = susp->input_x1_sample; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ + if (input_pHaSe_ReG >= 1.0) { + input_x1_sample_reg = input_x2_sample; + /* pick up next sample as input_x2_sample: */ + susp->input_ptr++; + susp_took(input_cnt, 1); + input_pHaSe_ReG -= 1.0; + susp_check_term_log_samples_break(input, input_ptr, input_cnt, input_x2_sample); + } +*out_ptr_reg++ = (sample_type) + (input_x1_sample_reg * (1 - input_pHaSe_ReG) + input_x2_sample * input_pHaSe_ReG); + input_pHaSe_ReG += input_pHaSe_iNcR_rEg; + } while (--n); /* inner loop */ + + togo -= n; + susp->input_pHaSe = input_pHaSe_ReG; + susp->input_x1_sample = input_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; + } +} /* up_i_fetch */ + + +void up_r_fetch(register up_susp_type susp, snd_list_type snd_list) +{ + int cnt = 0; /* how many samples computed */ + sample_type input_DeLtA; + sample_type input_val; + sample_type input_x2_sample; + int togo; + int n; + sample_block_type out; + register sample_block_values_type out_ptr; + + register sample_block_values_type out_ptr_reg; + + falloc_sample_block(out, "up_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->input_pHaSe = 1.0; + } + + susp_check_term_log_samples(input, input_ptr, input_cnt); + input_x2_sample = susp_current_sample(input, input_ptr); + + 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 input_x2_sample when phase goes past 1.0; */ + /* we use input_n (computed below) to avoid roundoff errors: */ + if (susp->input_n <= 0) { + susp->input_x1_sample = input_x2_sample; + susp->input_ptr++; + susp_took(input_cnt, 1); + susp->input_pHaSe -= 1.0; + susp_check_term_log_samples(input, input_ptr, input_cnt); + input_x2_sample = susp_current_sample(input, input_ptr); + /* input_n gets number of samples before phase exceeds 1.0: */ + susp->input_n = (long) ((1.0 - susp->input_pHaSe) * + susp->output_per_input); + } + togo = min(togo, susp->input_n); + input_DeLtA = (sample_type) ((input_x2_sample - susp->input_x1_sample) * susp->input_pHaSe_iNcR); + input_val = (sample_type) (susp->input_x1_sample * (1.0 - susp->input_pHaSe) + + input_x2_sample * susp->input_pHaSe); + + /* 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; + out_ptr_reg = out_ptr; + if (n) do { /* the inner sample computation loop */ +*out_ptr_reg++ = (sample_type) input_val; + input_val += input_DeLtA; + } while (--n); /* inner loop */ + + out_ptr += togo; + susp->input_pHaSe += togo * susp->input_pHaSe_iNcR; + susp->input_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; + } +} /* up_r_fetch */ + + +void up_toss_fetch(susp, snd_list) + register up_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 input up to final_time for this block of zeros */ + while ((round((final_time - susp->input->t0) * susp->input->sr)) >= + susp->input->current) + susp_get_samples(input, input_ptr, input_cnt); + /* convert to normal processing when we hit final_count */ + /* we want each signal positioned at final_time */ + n = round((final_time - susp->input->t0) * susp->input->sr - + (susp->input->current - susp->input_cnt)); + susp->input_ptr += n; + susp_took(input_cnt, n); + susp->susp.fetch = susp->susp.keep_fetch; + (*(susp->susp.fetch))(susp, snd_list); +} + + +void up_mark(up_susp_type susp) +{ + sound_xlmark(susp->input); +} + + +void up_free(up_susp_type susp) +{ + sound_unref(susp->input); + ffree_generic(susp, sizeof(up_susp_node), "up_free"); +} + + +void up_print_tree(up_susp_type susp, int n) +{ + indent(n); + stdputstr("input:"); + sound_print_tree_1(susp->input, n); +} + + +sound_type snd_make_up(rate_type sr, sound_type input) +{ + register up_susp_type susp; + /* sr specified as input parameter */ + time_type t0 = input->t0; + int interp_desc = 0; + sample_type scale_factor = 1.0F; + time_type t0_min = t0; + /* combine scale factors of linear inputs (INPUT) */ + scale_factor *= input->scale; + input->scale = 1.0F; + + /* try to push scale_factor back to a low sr input */ + if (input->sr < sr) { input->scale = scale_factor; scale_factor = 1.0F; } + + if (input->sr > sr) { + sound_unref(input); + xlfail("snd-up: output sample rate must be higher than input"); + } + falloc_generic(susp, up_susp_node, "snd_make_up"); + + /* select a susp fn based on sample rates */ + interp_desc = (interp_desc << 2) + interp_style(input, sr); + switch (interp_desc) { + case INTERP_n: susp->susp.fetch = up_n_fetch; break; + case INTERP_i: susp->susp.fetch = up_i_fetch; break; + case INTERP_r: susp->susp.fetch = up_r_fetch; break; + default: snd_badsr(); break; + } + + susp->terminate_cnt = UNKNOWN; + /* handle unequal start times, if any */ + if (t0 < input->t0) sound_prepend_zeros(input, t0); + /* minimum start time over all inputs: */ + t0_min = min(input->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 = up_toss_fetch; + } + + /* initialize susp state */ + susp->susp.free = up_free; + susp->susp.sr = sr; + susp->susp.t0 = t0; + susp->susp.mark = up_mark; + susp->susp.print_tree = up_print_tree; + susp->susp.name = "up"; + susp->logically_stopped = false; + susp->susp.log_stop_cnt = logical_stop_cnt_cvt(input); + susp->started = false; + susp->susp.current = 0; + susp->input = input; + susp->input_cnt = 0; + susp->input_pHaSe = 0.0; + susp->input_pHaSe_iNcR = input->sr / sr; + susp->input_n = 0; + susp->output_per_input = sr / input->sr; + return sound_create((snd_susp_type)susp, t0, sr, scale_factor); +} + + +sound_type snd_up(rate_type sr, sound_type input) +{ + sound_type input_copy = sound_copy(input); + return snd_make_up(sr, input_copy); +} |