1 /* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 #ifndef DCBLOCK_H_ 7 #define DCBLOCK_H_ 8 9 #ifdef __cplusplus 10 extern "C" { 11 #endif 12 13 /* A DC blocking filter. */ 14 15 struct dcblock; 16 17 /* 18 * Create a DC blocking filter. 19 * 20 * Transfer fn: (1 - z^-1) / (1 - R * z^-1) 21 */ 22 struct dcblock *dcblock_new(float R); 23 24 /* Free a DC blocking filter. */ 25 void dcblock_free(struct dcblock *dcblock); 26 27 /* Process a buffer of audio data through the filter. 28 * Args: 29 * dcblock - The filter we want to use. 30 * data - The array of audio samples. 31 * count - The number of elements in the data array to process. 32 */ 33 void dcblock_process(struct dcblock *dcblock, float *data, int count); 34 35 #ifdef __cplusplus 36 } /* extern "C" */ 37 #endif 38 39 #endif /* DCBLOCK_H_ */ 40
