init

lib_audio_dsp/test/fir/src/main.c

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+// Copyright 2024-2025 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include "xmath/filter.h"
+
+FILE * _fopen(char * fname, char* mode) {
+  FILE * fp = fopen(fname, mode);
+  if (fp == NULL)
+  {
+    printf("Error opening a file\n");
+    exit(1);
+  }
+  return fp;
+}
+
+int main()
+{
+  // this is just a simple wrapper for lib_xcore_math's filter_fir_s32,
+  // for testing bit exactness against the Python model.
+
+  right_shift_t rsh = 0;
+  int32_t n_taps = 0;
+
+  FILE * in = _fopen("../sig_48k.bin", "rb");
+  FILE * out = _fopen("sig_out.bin", "wb");
+  FILE * coeffs = _fopen("coeffs.bin", "rb");
+
+  fseek(in, 0, SEEK_END);
+  int in_len = ftell(in) / sizeof(int32_t);
+  fseek(in, 0, SEEK_SET);
+
+  fread(&rsh, sizeof(int32_t), 1, coeffs);
+  fread(&n_taps, sizeof(int32_t), 1, coeffs);
+
+  int32_t * taps_buf = calloc(sizeof(int32_t), n_taps);
+  int32_t * samp_buf = calloc(sizeof(int32_t), n_taps);
+
+  fread(taps_buf, sizeof(int32_t), n_taps, coeffs);
+
+  //printf("%ld %ld %ld %ld %ld %d\n", taps_buf[0], taps_buf[1], taps_buf[2], taps_buf[3], taps_buf[4], lsh);
+  fclose(coeffs);
+
+  filter_fir_s32_t * filter = malloc(sizeof(filter_fir_s32_t));
+
+  filter_fir_s32_init(filter, samp_buf, n_taps, taps_buf, rsh);
+
+  for (unsigned i = 0; i < in_len; i++)
+  {
+    int32_t samp = 0, samp_out = 0;
+    fread(&samp, sizeof(int32_t), 1, in);
+    //printf("%ld ", samp);
+    samp_out = filter_fir_s32(filter, samp);
+    //printf("%ld ", samp_out);
+    fwrite(&samp_out, sizeof(int32_t), 1, out);
+  }
+
+  fclose(in);
+  fclose(out);
+
+  return 0;
+}