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