ref: 5202c4b7a010abbada58097189a596b86c80abff
dir: /stretch.h/
////////////////////////////////////////////////////////////////////////////
// **** AUDIO-STRETCH **** //
// Time Domain Harmonic Scaler //
// Copyright (c) 2019 David Bryant //
// All Rights Reserved. //
// Distributed under the BSD Software License (see license.txt) //
////////////////////////////////////////////////////////////////////////////
// stretch.h
// Time Domain Harmonic Compression and Expansion
//
// This library performs time domain harmonic scaling with pitch detection
// to stretch the timing of a 16-bit PCM signal (either mono or stereo) from
// 1/2 to 2 times its original length. This is done without altering any of
// its tonal characteristics.
//
// Use stereo (num_chans = 2), when both channels are from same source
// and should contain approximately similar content.
// For independent channels, prefer using multiple StretchHandle-instances.
// see https://github.com/dbry/audio-stretch/issues/6
// Multiple instances, of course, wil consume more CPU load.
// In addition, different output amounts need to be handled.
#ifndef STRETCH_H
#define STRETCH_H
#ifdef __cplusplus
extern "C" {
#endif
typedef void *StretchHandle;
StretchHandle stretch_init (int shortest_period, int longest_period, int num_chans, int fast_mode);
int stretch_samples (StretchHandle handle, const short *samples, int num_samples, short *output, float ratio);
int stretch_flush (StretchHandle handle, short *output);
void stretch_reset (StretchHandle handle);
void stretch_deinit (StretchHandle handle);
#ifdef __cplusplus
}
#endif
#endif