mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-12-23 05:46:31 +01:00
e1b7a5f376
Add function generate_sine_wave_raw_mono(). It serves as a single channel sine wave generator, to provide data for calculation (e.g. for noise analysis). The function is similar to generate_sine_wave(), but a lite revision. It has no dependency on bat channels and target frequency, no malloc inside, no data conversion from float to integer samples, and supports one channel only. Signed-off-by: Lu, Han <han.lu@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
31 lines
1.2 KiB
C
31 lines
1.2 KiB
C
/*
|
|
* Copyright (C) 2015 Caleb Crome
|
|
* Copyright (C) 2013-2015 Intel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Here's a generic sine wave generator that will work indefinitely
|
|
* for any frequency.
|
|
*
|
|
* Note: the state & phasor are stored as doubles (and updated as
|
|
* doubles) because after a million samples the magnitude drifts a
|
|
* bit. If we really need floats, it can be done with periodic
|
|
* renormalization of the state_real+state_imag magnitudes.
|
|
*/
|
|
|
|
int sin_generator_init(struct sin_generator *, float, float, float);
|
|
float sin_generator_next_sample(struct sin_generator *);
|
|
void sin_generator_vfill(struct sin_generator *, float *, int);
|
|
int generate_sine_wave(struct bat *, int, void *);
|
|
int generate_sine_wave_raw_mono(struct bat *, float *, float, int);
|