summaryrefslogtreecommitdiff
path: root/nyqsrc/avg.c
diff options
context:
space:
mode:
Diffstat (limited to 'nyqsrc/avg.c')
-rw-r--r--nyqsrc/avg.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/nyqsrc/avg.c b/nyqsrc/avg.c
new file mode 100644
index 0000000..1a08ee1
--- /dev/null
+++ b/nyqsrc/avg.c
@@ -0,0 +1,273 @@
+#include "stdio.h"
+#ifndef mips
+#include "stdlib.h"
+#endif
+#include "xlisp.h"
+#include "sound.h"
+
+#include "falloc.h"
+#include "cext.h"
+#include "avg.h"
+
+/* CHANGE LOG
+ * --------------------------------------------------------------------
+ * 28Apr03 dm changes for portability and fix compiler warnings
+ */
+
+
+void avg_free();
+
+typedef sample_type (*process_block_type)(/* struct avg_susp_struct *susp */);
+
+typedef struct avg_susp_struct {
+ snd_susp_node susp;
+ long terminate_cnt;
+ boolean logically_stopped;
+ sound_type s;
+ long s_cnt;
+ sample_block_values_type s_ptr;
+ /* blocksize is how many input samples to process for an output sample */
+ long blocksize;
+ /* stepsize is how far to advance to get the next block of samples */
+ long stepsize;
+ sample_type *buffer;
+ sample_type *fillptr; /* samples are added to buffer at fillptr */
+ sample_type *endptr; /* until endptr is reached */
+ process_block_type process_block;
+} avg_susp_node, *avg_susp_type;
+
+
+sample_type average_block(avg_susp_type susp)
+{
+ /* this version just computes average */
+ double sum = 0.0;
+ int i;
+ for (i = 0; i < susp->blocksize; i++) {
+ sum += susp->buffer[i];
+ }
+ for (i = susp->stepsize; i < susp->blocksize; i++) {
+ susp->buffer[i - susp->stepsize] = susp->buffer[i];
+ }
+ return (sample_type) (sum / susp->blocksize);
+}
+
+
+sample_type peak_block(avg_susp_type susp)
+{
+ /* this version just computes average */
+ sample_type peak = 0.0F;
+ sample_type minus_peak = 0.0F;
+ int i;
+ for (i = 0; i < susp->blocksize; i++) {
+ sample_type s = susp->buffer[i];
+ if (s > peak) {
+ peak = s; minus_peak = -s;
+ } else if (s < minus_peak) {
+ minus_peak = s; peak = -s;
+ }
+ }
+ for (i = susp->stepsize; i < susp->blocksize; i++) {
+ susp->buffer[i - susp->stepsize] = susp->buffer[i];
+ }
+ return peak;
+}
+
+
+void avg_s_fetch(avg_susp_type susp, snd_list_type snd_list)
+{
+ int cnt = 0; /* how many samples computed */
+ int togo = 0;
+ int n;
+ sample_block_type out;
+ register sample_block_values_type out_ptr;
+
+ register sample_type *fillptr_reg;
+ register sample_type *endptr_reg = susp->endptr;
+
+ register sample_block_values_type s_ptr_reg;
+ falloc_sample_block(out, "avg_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) * susp->stepsize;
+
+ /* don't run past the s input sample block: */
+ susp_check_term_log_samples(s, s_ptr, s_cnt);
+ togo = MIN(togo, susp->s_cnt);
+
+ /* don't run past terminate time */
+ if (susp->terminate_cnt != UNKNOWN &&
+ susp->terminate_cnt <= susp->susp.current + cnt + togo/susp->stepsize) {
+ togo = (susp->terminate_cnt - (susp->susp.current + cnt)) * susp->stepsize;
+ 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/susp->stepsize) {
+ 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 * susp->stepsize;
+ }
+ }
+
+ n = togo;
+ s_ptr_reg = susp->s_ptr;
+ fillptr_reg = susp->fillptr;
+ if (n) do { /* the inner sample computation loop */
+ *fillptr_reg++ = *s_ptr_reg++;
+ if (fillptr_reg >= endptr_reg) {
+ *out_ptr++ = (*(susp->process_block))(susp);
+ cnt++;
+ fillptr_reg -= susp->stepsize;
+ }
+ } while (--n); /* inner loop */
+
+ /* using s_ptr_reg is a bad idea on RS/6000: */
+ susp->s_ptr += togo;
+ susp->fillptr = fillptr_reg;
+ susp_took(s_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;
+ }
+} /* avg_s_fetch */
+
+
+void avg_toss_fetch(susp, snd_list)
+ avg_susp_type susp;
+ snd_list_type snd_list;
+{
+ long final_count = MIN(susp->susp.current + max_sample_block_len,
+ susp->susp.toss_cnt);
+ time_type final_time = susp->susp.t0 + final_count / susp->susp.sr;
+ long n;
+
+ /* fetch samples from s up to final_time for this block of zeros */
+ while (((long) ((final_time - susp->s->t0) * susp->s->sr + 0.5)) >=
+ susp->s->current)
+ susp_get_samples(s, s_ptr, s_cnt);
+ /* convert to normal processing when we hit final_count */
+ /* we want each signal positioned at final_time */
+ if (final_count == susp->susp.toss_cnt) {
+ n = ROUND((final_time - susp->s->t0) * susp->s->sr -
+ (susp->s->current - susp->s_cnt));
+ susp->s_ptr += n;
+ susp_took(s_cnt, n);
+ susp->susp.fetch = susp->susp.keep_fetch;
+ }
+ snd_list->block_len = (short) (final_count - susp->susp.current);
+ susp->susp.current = final_count;
+ snd_list->u.next = snd_list_create((snd_susp_type) susp);
+ snd_list->block = internal_zero_block;
+}
+
+
+void avg_mark(avg_susp_type susp)
+{
+ sound_xlmark(susp->s);
+}
+
+
+void avg_free(avg_susp_type susp)
+{
+ sound_unref(susp->s);
+ free(susp->buffer);
+ ffree_generic(susp, sizeof(avg_susp_node), "avg_free");
+}
+
+
+void avg_print_tree(avg_susp_type susp, int n)
+{
+ indent(n);
+ stdputstr("s:");
+ sound_print_tree_1(susp->s, n);
+}
+
+
+sound_type snd_make_avg(sound_type s, long blocksize, long stepsize, long op)
+{
+ long buffersize;
+ register avg_susp_type susp;
+ rate_type sr = s->sr;
+ time_type t0 = s->t0;
+ time_type t0_min = t0;
+
+ falloc_generic(susp, avg_susp_node, "snd_make_avg");
+ susp->susp.fetch = avg_s_fetch;
+ susp->terminate_cnt = UNKNOWN;
+ /* handle unequal start times, if any */
+ if (t0 < s->t0) sound_prepend_zeros(s, t0);
+ /* minimum start time over all inputs: */
+ t0_min = MIN(s->t0, t0);
+ /* how many samples to toss before t0: */
+ susp->susp.toss_cnt = ROUND((t0 - t0_min) * sr);
+ if (susp->susp.toss_cnt > 0) {
+ susp->susp.keep_fetch = susp->susp.fetch;
+ susp->susp.fetch = avg_toss_fetch;
+ t0 = t0_min;
+ }
+
+ /* initialize susp state */
+ susp->susp.free = avg_free;
+ susp->susp.sr = sr / stepsize;
+ susp->susp.t0 = t0;
+ susp->susp.mark = avg_mark;
+ susp->susp.print_tree = avg_print_tree;
+ susp->susp.name = "avg";
+ susp->logically_stopped = false;
+ susp->susp.log_stop_cnt = logical_stop_cnt_cvt(s);
+ susp->susp.current = 0;
+ susp->s = s;
+ susp->s_cnt = 0;
+ susp->blocksize = blocksize;
+ susp->stepsize = stepsize;
+ /* We need at least blocksize samples in buffer, but if stepsize > blocksize,
+ it is convenient to put stepsize samples in buffer. This allows us to
+ step ahead by stepsize samples just by flushing the buffer. */
+ buffersize = MAX(blocksize, stepsize);
+ susp->buffer = (sample_type *) malloc(buffersize * sizeof(sample_type));
+ susp->fillptr = susp->buffer;
+ susp->endptr = susp->buffer + buffersize;
+ susp->process_block = average_block;
+ if (op == op_peak) susp->process_block = peak_block;
+ /* scale factor gets passed to output signal: */
+ return sound_create((snd_susp_type) susp, t0, susp->susp.sr, susp->s->scale);
+}
+
+
+sound_type snd_avg(sound_type s, long blocksize, long stepsize, long op)
+{
+ sound_type s_copy = sound_copy(s);
+ return snd_make_avg(s_copy, blocksize, stepsize, op);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 11:05:52 +0000