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#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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