stretcher.h

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// SPDX-FileCopyrightText: © 2019-2020 Alexandros Theodotou <alex@zrythm.org>
// SPDX-License-Identifier: LicenseRef-ZrythmLicense
 
#ifndef __AUDIO_STRETCHER_H__
#define __AUDIO_STRETCHER_H__
 
#include <stdbool.h>
#include <stddef.h>
#include <sys/types.h>
 
#include "utils/types.h"
 
#include <rubberband/rubberband-c.h>
 
typedef enum StretcherBackend
{
  STRETCHER_BACKEND_RUBBERBAND,
 
  STRETCHER_BACKEND_PAULSTRETCH,
 
  STRETCHER_BACKEND_SBSMS,
} StretcherBackend;
 
typedef struct Stretcher
{
  StretcherBackend backend;
 
  RubberBandState rubberband_state;
 
  unsigned int samplerate;
  unsigned int channels;
 
  bool is_realtime;
 
  unsigned int block_size;
} Stretcher;
 
Stretcher *
stretcher_new_rubberband (
  unsigned int samplerate,
  unsigned int channels,
  double       time_ratio,
  double       pitch_ratio,
  bool         realtime);
 
ssize_t
stretcher_stretch (
  Stretcher * self,
  float *     in_samples_l,
  float *     in_samples_r,
  size_t      in_samples_size,
  float *     out_samples_l,
  float *     out_samples_r,
  size_t      out_samples_wanted);
 
unsigned int
stretcher_get_latency (Stretcher * self);
 
void
stretcher_set_time_ratio (Stretcher * self, double ratio);
 
ssize_t
stretcher_stretch_interleaved (
  Stretcher * self,
  float *     in_samples,
  size_t      in_samples_size,
  float **    _out_samples);
 
void
stretcher_free (Stretcher * self);
 
#endif