From c8cd7f9298de876f2046fddd2e322a63c421a505 Mon Sep 17 00:00:00 2001
From: gramanas <anastasis.gramm2@gmail.com>
Date: Fri, 7 Jul 2023 01:09:12 +0300
Subject: suppa

---
 src/osc.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/osc.c

(limited to 'src/osc.c')

diff --git a/src/osc.c b/src/osc.c
new file mode 100644
index 0000000..295c83d
--- /dev/null
+++ b/src/osc.c
@@ -0,0 +1,97 @@
+#include "synth_common.h"
+#include "osc.h"
+
+#include <sndfile.h>
+#include <stdlib.h>
+#include <stddef.h>
+
+
+float
+osc_interpolate(float offset, float start, float end) {
+  // linear interpolation between start and end
+  float m = (end - start) / (1 - 0);
+  float b = start /* + m * 0 */;
+
+  // the value to pick
+  float x = offset - (int)offset;
+
+  return m * x + b;
+}
+
+int
+osc_next_index(osc_t * osc, float offset)
+{
+  if (offset >= osc->len) offset = 0;
+
+  int current_index = (int)offset;
+  return current_index + 1 >= osc->len ? 0 : current_index + 1;
+}
+
+
+float
+osc_next_offset(osc_t * osc, float f, float offset)
+{
+  if (offset >= osc->len) offset = 0;
+
+  if (osc->type == SAMPLE) {
+    // this makes A2 be the base ???
+    // A2 = 220.0 Hz is base ???
+    // get this from osc*
+    f = f / (16.35160 * pow(2, (2 + 5 / 12.0)));
+  }
+
+  float step = f * ((float)osc->len / SAMPLE_RATE);
+
+  offset += step;
+  if (offset >= osc->len) {
+    offset -= osc->len;
+  }
+
+  return offset;
+}
+
+int
+osc_load_wav(osc_t * osc, const char * path)
+{
+  SNDFILE* file;
+  SF_INFO fileInfo;
+  int numSamplesRead;
+
+  // Open the WAV file
+  file = sf_open(path, SFM_READ, &fileInfo);
+  if (!file) {
+    printf("Failed to open the WAV file: %s\n", sf_strerror(NULL));
+    return -1;
+  }
+  
+  printf("Opened %s: \n", path);
+  printf("frames: %ld sr: %d chan: %d format: %d sections: %d seekable: %d\n", fileInfo.frames, fileInfo.samplerate, fileInfo.channels, fileInfo.format, fileInfo.sections, fileInfo.seekable);
+
+  // Ensure the WAV file has only one channel
+  if (fileInfo.channels != 1) {
+    printf("Only mono WAV files are supported.\n");
+    sf_close(file);
+    return -1;
+  }
+
+  osc->len = fileInfo.frames;
+  osc->end = fileInfo.frames;
+  osc->data = (float *) malloc(sizeof(float) * fileInfo.frames);
+
+    // Read the WAV file into the buffer
+  numSamplesRead = sf_readf_float(file, osc->data, fileInfo.frames);
+
+  /* float max = -1000; */
+  /* float min = 1000; */
+  /* for (int i = 0; i < numSamplesRead; i++) { */
+  /*   float s = osc_sound_data[i]; */
+  /*   //    printf("Sample %d: %f\n", i, s); */
+  /*   if (s < min) min = s; */
+  /*   if (s > max) max = s; */
+  /* } */
+  /* printf("Min: %f Max: %f\n", min, max); */
+  
+  // Close the WAV file
+  sf_close(file);
+  return 0;
+}
-- 
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