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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SOFTVOL_CURVE_H_
#define SOFTVOL_CURVE_H_
#include <math.h>
#define LOG_10 2.302585
struct cras_volume_curve;
extern const float softvol_scalers[101];
/* Returns the volume scaler in the soft volume curve for the given index. */
static inline float softvol_get_scaler(unsigned int volume_index)
{
return softvol_scalers[volume_index];
}
/* convert dBFS to softvol scaler */
static inline float convert_softvol_scaler_from_dB(long dBFS)
{
return expf(LOG_10 * dBFS / 2000);
}
/* Builds software volume scalers from volume curve. */
float *softvol_build_from_curve(const struct cras_volume_curve *curve);
#endif /* SOFTVOL_CURVE_H_ */
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