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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 DCBLOCK_H_
#define DCBLOCK_H_
#ifdef __cplusplus
extern "C" {
#endif
/* A DC blocking filter. */
struct dcblock;
/*
* Create a DC blocking filter.
*
* Transfer fn: (1 - z^-1) / (1 - R * z^-1)
* Args:
* R - DC block filter coefficient.
* sample_rate - The sample rate, in Hz.
*/
struct dcblock *dcblock_new(float R, unsigned long sample_rate);
/* Free a DC blocking filter. */
void dcblock_free(struct dcblock *dcblock);
/* Process a buffer of audio data through the filter.
* Args:
* dcblock - The filter we want to use.
* data - The array of audio samples.
* count - The number of elements in the data array to process.
*/
void dcblock_process(struct dcblock *dcblock, float *data, int count);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* DCBLOCK_H_ */
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