rnnoise_vad_demo.c

/* Copyright (c) 2017 Mozilla */
/* Copyright (c) 2017 Jan Weiß */
/*
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

 - Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.

 - Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "rnnoise.h"

#define FRAME_SIZE 480
#define SAMPLE_RATE 48000

#define LOG_VAD_PROBABILITY 0 // In Audacity text label format.

int
main(int argc, const char* argv[])
{
  int i;
  int first = 1;
  float x[FRAME_SIZE];

#if LOG_VAD_PROBABILITY
  const double frame_length = (double)FRAME_SIZE / (double)SAMPLE_RATE;
#endif

  FILE *in_file_handle, *out_file_handle;
#if LOG_VAD_PROBABILITY
  FILE* vad_file_handle;
#endif

  DenoiseState* st;
  st = rnnoise_create();

  if (argc != 3) {
    fprintf(stderr, "usage: %s <noisy speech> <output denoised>\n", argv[0]);
    return EXIT_FAILURE;
  }

  const char* input_path = argv[1];
  const char* output_path = argv[2];

  in_file_handle = fopen(input_path, "r");
  out_file_handle = fopen(output_path, "w");

#if LOG_VAD_PROBABILITY
  const size_t output_path_length = strlen(output_path);

  const char* suffix = ".vad.txt";
  const size_t suffix_length = strlen(suffix);

  const size_t vad_path_length = output_path_length + suffix_length + 1;
  char vad_path[vad_path_length];
  strncat(vad_path, output_path, vad_path_length);
  strncat(vad_path, suffix, vad_path_length);

  vad_file_handle = fopen(vad_path, "w");

  size_t frame_index = 0;
#endif

  while (1) {
    if (feof(in_file_handle)) {
      break;
    }

    short tmp[FRAME_SIZE];
    size_t samples_read = fread(tmp, sizeof(short), FRAME_SIZE, in_file_handle);

    if (samples_read == 0) {
      break;
    }

    for (i = 0; i < samples_read; i += 1) {
      x[i] = (float)tmp[i];
    }
    for (; i < FRAME_SIZE; i += 1) {
      x[i] = (float)0;
    }

#if LOG_VAD_PROBABILITY
    float vad_prob =
#endif
      rnnoise_process_frame(st, x, x);

#if LOG_VAD_PROBABILITY
    double frame_start = frame_length * frame_index;
    double frame_end;

    if (samples_read == FRAME_SIZE) {
      frame_end = frame_start + frame_length;
    } else {
      frame_end = frame_start +
                  (frame_length * (double)samples_read / (double)FRAME_SIZE);
    }

    fprintf(vad_file_handle, "%0.6f\t%0.6f\t%f\n", frame_start, frame_end,
            vad_prob);
#endif

    for (i = 0; i < samples_read; i += 1) {
      tmp[i] = x[i];
    }

    if (!first) {
      fwrite(tmp, sizeof(short), samples_read, out_file_handle);
    }

    first = 0;

#if LOG_VAD_PROBABILITY
    frame_index += 1;
#endif
  }

  rnnoise_destroy(st);
  fclose(in_file_handle);
  fclose(out_file_handle);
#if LOG_VAD_PROBABILITY
  fclose(vad_file_handle);
#endif

  return EXIT_SUCCESS;
}