1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2016 Alex Teaca <iateaca@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _AUDIO_EMUL_H_ 30 #define _AUDIO_EMUL_H_ 31 32 #include <sys/types.h> 33 #include <sys/soundcard.h> 34 35 /* 36 * Audio Player data structures 37 */ 38 39 struct audio; 40 41 struct audio_params { 42 int channels; 43 int format; 44 int rate; 45 }; 46 47 /* 48 * Audio Player API 49 */ 50 51 /* 52 * audio_init - initialize an instance of audio player 53 * @dev_name - the backend sound device used to play / capture 54 * @dir - dir = 1 for write mode, dir = 0 for read mode 55 * Returns NULL on error and the address of the audio player instance 56 */ 57 struct audio *audio_init(const char *dev_name, uint8_t dir); 58 59 /* 60 * audio_set_params - reset the sound device and set the audio params 61 * @aud - the audio player to be configured 62 * @params - the audio parameters to be set 63 * Returns -1 on error and 0 on success 64 */ 65 int audio_set_params(struct audio *aud, struct audio_params *params); 66 67 /* 68 * audio_playback - plays samples to the sound device using blocking operations 69 * @aud - the audio player used to play the samples 70 * @buf - the buffer containing the samples 71 * @count - the number of bytes in buffer 72 * Returns -1 on error and 0 on success 73 */ 74 int audio_playback(struct audio *aud, const uint8_t *buf, size_t count); 75 76 /* 77 * audio_record - records samples from the sound device using blocking 78 * operations. 79 * @aud - the audio player used to capture the samples 80 * @buf - the buffer to receive the samples 81 * @count - the number of bytes to capture in buffer 82 * Returns -1 on error and 0 on success 83 */ 84 int audio_record(struct audio *aud, uint8_t *buf, size_t count); 85 86 #endif /* _AUDIO_EMUL_H_ */ 87