21d8546588
This is an example demonstrating the usage of the OSS-compatible APIs provided by the sound(4) subsystem. It reads frames from a dsp node and writes them to the same dsp node. MFC after: 2 weeks Reviewed by: hselasky, bcr Differential revision: https://reviews.freebsd.org/D30149
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2021 Goran Mekić
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "ossinit.h"
|
|
|
|
int
|
|
main()
|
|
{
|
|
config_t config = {
|
|
.device = "/dev/dsp",
|
|
.channels = -1,
|
|
.format = format,
|
|
.frag = -1,
|
|
.sample_rate = 48000,
|
|
.sample_size = sizeof(sample_t),
|
|
.buffer_info.fragments = -1,
|
|
.mmap = 0,
|
|
};
|
|
|
|
/* Initialize device */
|
|
oss_init(&config);
|
|
|
|
/*
|
|
* Allocate input and output buffers so that their size match
|
|
* frag_size
|
|
*/
|
|
int ret;
|
|
int bytes = config.buffer_info.bytes;
|
|
int8_t *ibuf = malloc(bytes);
|
|
int8_t *obuf = malloc(bytes);
|
|
sample_t *channels = malloc(bytes);
|
|
|
|
printf(
|
|
"bytes: %d, fragments: %d, fragsize: %d, fragstotal: %d, samples: %d\n",
|
|
bytes,
|
|
config.buffer_info.fragments,
|
|
config.buffer_info.fragsize,
|
|
config.buffer_info.fragstotal,
|
|
config.sample_count
|
|
);
|
|
|
|
/* Minimal engine: read input and copy it to the output */
|
|
for (;;) {
|
|
ret = read(config.fd, ibuf, bytes);
|
|
if (ret < bytes) {
|
|
fprintf(
|
|
stderr,
|
|
"Requested %d bytes, but read %d!\n",
|
|
bytes,
|
|
ret
|
|
);
|
|
break;
|
|
}
|
|
oss_split(&config, (sample_t *)ibuf, channels);
|
|
/* All processing will happen here */
|
|
oss_merge(&config, channels, (sample_t *)obuf);
|
|
ret = write(config.fd, obuf, bytes);
|
|
if (ret < bytes) {
|
|
fprintf(
|
|
stderr,
|
|
"Requested %d bytes, but wrote %d!\n",
|
|
bytes,
|
|
ret
|
|
);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Cleanup */
|
|
free(channels);
|
|
free(obuf);
|
|
free(ibuf);
|
|
close(config.fd);
|
|
return (0);
|
|
}
|