2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2021 Goran Mekić
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 .sample_size = sizeof(sample_t),
40 .buffer_info.fragments = -1,
44 /* Initialize device */
48 * Allocate input and output buffers so that their size match
52 int bytes = config.buffer_info.bytes;
53 int8_t *ibuf = malloc(bytes);
54 int8_t *obuf = malloc(bytes);
55 sample_t *channels = malloc(bytes);
58 "bytes: %d, fragments: %d, fragsize: %d, fragstotal: %d, samples: %d\n",
60 config.buffer_info.fragments,
61 config.buffer_info.fragsize,
62 config.buffer_info.fragstotal,
66 /* Minimal engine: read input and copy it to the output */
68 ret = read(config.fd, ibuf, bytes);
72 "Requested %d bytes, but read %d!\n",
78 oss_split(&config, (sample_t *)ibuf, channels);
79 /* All processing will happen here */
80 oss_merge(&config, channels, (sample_t *)obuf);
81 ret = write(config.fd, obuf, bytes);
85 "Requested %d bytes, but wrote %d!\n",