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 RAW_H_ 7 #define RAW_H_ 8 9 #ifdef __cplusplus 10 extern "C" { 11 #endif 12 13 #include <stddef.h> 14 15 /* Reads a raw file to a float buffer. 16 * Args: 17 * filename - The name of the raw file. 18 * frames - Returns the number of frames read. 19 * Returns: 20 * The float buffer allocated by malloc(), or NULL if reading fails. The 21 * first half of the buffer contains left channel data, and the second half 22 * contains the right channel data. 23 * The raw file is assumed to have two channel 16 bit signed integer samples in 24 * native endian. The raw file can be created by: 25 * sox input.wav output.raw 26 * The raw file can be played by: 27 * play -r 44100 -s -b 16 -c 2 test.raw 28 */ 29 float *read_raw(const char *filename, size_t *frames); 30 31 /* Writes a float buffer to a raw file. 32 * Args: 33 * filename - The name of the raw file. 34 * buf - The float buffer containing the samples. 35 * frames - The number of frames in the float buffer. 36 * Returns: 37 * 0 if success. -1 if writing fails. 38 * The format of the float buffer is the same as described in read_raw(). 39 */ 40 void write_raw(const char *filename, float *buf, size_t frames); 41 42 #ifdef __cplusplus 43 } /* extern "C" */ 44 #endif 45 46 #endif /* RAW_H_ */ 47
