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https://github.com/alsa-project/alsa-utils
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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>
32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
/*
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* Copyright (C) 2015 Caleb Crome
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* Copyright (C) 2013-2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/*
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* Here's a generic sine wave generator that will work indefinitely
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* for any frequency.
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*
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* Note: the state & phasor are stored as doubles (and updated as
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* doubles) because after a million samples the magnitude drifts a
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* bit. If we really need floats, it can be done with periodic
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* renormalization of the state_real+state_imag magnitudes.
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*/
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int sin_generator_init(struct sin_generator *, float, float, float);
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float sin_generator_next_sample(struct sin_generator *);
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void sin_generator_vfill(struct sin_generator *, float *, int);
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int generate_sine_wave(struct bat *, int, void *);
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int generate_sine_wave_raw_mono(struct bat *, float *, float, int);
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