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sound examples: Add sndstat nvlist example

Browse source 
Sponsored by:	The FreeBSD Foundation
MFC after:	2 days
Reviewed by:	dev_submerge.ch
Differential Revision:	https://reviews.freebsd.org/D45969

(cherry picked from commit f08ecd24a1)
This commit is contained in:
Christos Margiolis 2024-07-27 14:54:40 +03:00
parent d8c42c3417
commit b4a9d6c8fa
2 changed files with 208 additions and 1 deletions
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3
share/examples/Makefile
View file

@ -310,7 +310,8 @@ SE_SCSI_TARGET= \
scsi_cmds.c
SE_DIRS+= sound
SE_SOUND=
SE_SOUND= \
sndstat_nv.c
SE_DIRS+= sound/oss
SE_SOUND_OSS= \

206
share/examples/sound/sndstat_nv.c Normal file
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@ -0,0 +1,206 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 The FreeBSD Foundation
*
* This software was developed by Christos Margiolis <christos@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* 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 <sys/sndstat.h>
#include <sys/nv.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
/*
* Example program showcasing how to use sndstat(4)'s nvlist interface, and how
* to fetch all currently supported fields, with the appropriate error checks.
*
* For more detailed information on what each nvlist field represents, please
* read sndstat(4)'s man page.
*/
int
main(int argc, char *argv[])
{
nvlist_t *nvl;
const nvlist_t * const *di;
const nvlist_t * const *cdi;
struct sndstioc_nv_arg arg;
size_t nitems, nchans, i, j;
int fd, pchan, rchan;
if ((fd = open("/dev/sndstat", O_RDONLY)) < 0)
err(1, "open(/dev/sndstat)");
if (ioctl(fd, SNDSTIOC_REFRESH_DEVS, NULL) < 0)
err(1, "ioctl(SNDSTIOC_REFRESH_DEVS)");
arg.nbytes = 0;
arg.buf = NULL;
if (ioctl(fd, SNDSTIOC_GET_DEVS, &arg) < 0)
err(1, "ioctl(SNDSTIOC_GET_DEVS#1)");
if ((arg.buf = malloc(arg.nbytes)) == NULL)
err(1, "malloc");
if (ioctl(fd, SNDSTIOC_GET_DEVS, &arg) < 0)
err(1, "ioctl(SNDSTIOC_GET_DEVS#2)");
if ((nvl = nvlist_unpack(arg.buf, arg.nbytes, 0)) == NULL)
err(1, "nvlist_unpack");
if (nvlist_empty(nvl) || !nvlist_exists(nvl, SNDST_DSPS))
errx(1, "no soundcards attached");
di = nvlist_get_nvlist_array(nvl, SNDST_DSPS, &nitems);
for (i = 0; i < nitems; i++) {
#define NV(type, item) \
nvlist_get_ ## type (di[i], SNDST_DSPS_ ## item)
printf("nameunit=%s\n", NV(string, NAMEUNIT));
printf("\tfrom_user=%d\n", NV(bool, FROM_USER));
printf("\tdevnode=%s\n", NV(string, DEVNODE));
printf("\tdesc=%s\n", NV(string, DESC));
printf("\tprovider=%s\n", NV(string, PROVIDER));
printf("\tpchan=%d\n", (int)NV(number, PCHAN));
printf("\trchan=%d\n", (int)NV(number, RCHAN));
pchan = NV(number, PCHAN);
rchan = NV(number, RCHAN);
#undef NV
if (pchan && !nvlist_exists(di[i], SNDST_DSPS_INFO_PLAY))
errx(1, "playback channel list empty");
if (rchan && !nvlist_exists(di[i], SNDST_DSPS_INFO_REC))
errx(1, "recording channel list empty");
#define NV(type, mode, item) \
nvlist_get_ ## type (nvlist_get_nvlist(di[i], \
SNDST_DSPS_INFO_ ## mode), SNDST_DSPS_INFO_ ## item)
if (pchan) {
printf("\tplay_min_rate=%d\n",
(int)NV(number, PLAY, MIN_RATE));
printf("\tplay_max_rate=%d\n",
(int)NV(number, PLAY, MAX_RATE));
printf("\tplay_formats=%#08x\n",
(int)NV(number, PLAY, FORMATS));
printf("\tplay_min_chn=%d\n",
(int)NV(number, PLAY, MIN_CHN));
printf("\tplay_max_chn=%d\n",
(int)NV(number, PLAY, MAX_CHN));
}
if (rchan) {
printf("\trec_min_rate=%d\n",
(int)NV(number, REC, MIN_RATE));
printf("\trec_max_rate=%d\n",
(int)NV(number, REC, MAX_RATE));
printf("\trec_formats=%#08x\n",
(int)NV(number, REC, FORMATS));
printf("\trec_min_chn=%d\n",
(int)NV(number, REC, MIN_CHN));
printf("\trec_max_chn=%d\n",
(int)NV(number, REC, MAX_CHN));
}
#undef NV
if (!nvlist_exists(di[i], SNDST_DSPS_PROVIDER_INFO))
continue;
#define NV(type, item) \
nvlist_get_ ## type (nvlist_get_nvlist(di[i], \
SNDST_DSPS_PROVIDER_INFO), SNDST_DSPS_SOUND4_ ## item)
printf("\tunit=%d\n", (int)NV(number, UNIT));
printf("\tstatus=%s\n", NV(string, STATUS));
printf("\tbitperfect=%d\n", NV(bool, BITPERFECT));
printf("\tpvchan=%d\n", (int)NV(number, PVCHAN));
printf("\tpvchanrate=%d\n", (int)NV(number, PVCHANRATE));
printf("\tpvchanformat=%#08x\n", (int)NV(number, PVCHANFORMAT));
printf("\trvchan=%d\n", (int)NV(number, RVCHAN));
printf("\trvchanrate=%d\n", (int)NV(number, RVCHANRATE));
printf("\trvchanformat=%#08x\n", (int)NV(number, RVCHANFORMAT));
#undef NV
if (!nvlist_exists(nvlist_get_nvlist(di[i],
SNDST_DSPS_PROVIDER_INFO), SNDST_DSPS_SOUND4_CHAN_INFO))
errx(1, "channel info list empty");
cdi = nvlist_get_nvlist_array(
nvlist_get_nvlist(di[i], SNDST_DSPS_PROVIDER_INFO),
SNDST_DSPS_SOUND4_CHAN_INFO, &nchans);
for (j = 0; j < nchans; j++) {
#define NV(type, item) \
nvlist_get_ ## type (cdi[j], SNDST_DSPS_SOUND4_CHAN_ ## item)
printf("\tchan=%s\n", NV(string, NAME));
printf("\t\tparentchan=%s\n", NV(string, PARENTCHAN));
printf("\t\tunit=%d\n", (int)NV(number, UNIT));
printf("\t\tcaps=%#08x\n", (int)NV(number, CAPS));
printf("\t\tlatency=%d\n", (int)NV(number, LATENCY));
printf("\t\trate=%d\n", (int)NV(number, RATE));
printf("\t\tformat=%#08x\n", (int)NV(number, FORMAT));
printf("\t\tpid=%d\n", (int)NV(number, PID));
printf("\t\tcomm=%s\n", NV(string, COMM));
printf("\t\tintr=%d\n", (int)NV(number, INTR));
printf("\t\txruns=%d\n", (int)NV(number, XRUNS));
printf("\t\tfeedcnt=%d\n", (int)NV(number, FEEDCNT));
printf("\t\tleftvol=%d\n", (int)NV(number, LEFTVOL));
printf("\t\trightvol=%d\n", (int)NV(number, RIGHTVOL));
printf("\t\thwbuf_format=%#08x\n",
(int)NV(number, HWBUF_FORMAT));
printf("\t\thwbuf_size=%d\n",
(int)NV(number, HWBUF_SIZE));
printf("\t\thwbuf_blksz=%d\n",
(int)NV(number, HWBUF_BLKSZ));
printf("\t\thwbuf_blkcnt=%d\n",
(int)NV(number, HWBUF_BLKCNT));
printf("\t\thwbuf_free=%d\n",
(int)NV(number, HWBUF_FREE));
printf("\t\thwbuf_ready=%d\n",
(int)NV(number, HWBUF_READY));
printf("\t\tswbuf_format=%#08x\n",
(int)NV(number, SWBUF_FORMAT));
printf("\t\tswbuf_size=%d\n",
(int)NV(number, SWBUF_SIZE));
printf("\t\tswbuf_blksz=%d\n",
(int)NV(number, SWBUF_BLKSZ));
printf("\t\tswbuf_blkcnt=%d\n",
(int)NV(number, SWBUF_BLKCNT));
printf("\t\tswbuf_free=%d\n",
(int)NV(number, SWBUF_FREE));
printf("\t\tswbuf_ready=%d\n",
(int)NV(number, SWBUF_READY));
printf("\t\tswbuf_feederchain=%s\n",
NV(string, FEEDERCHAIN));
#undef NV
}
}
free(arg.buf);
nvlist_destroy(nvl);
close(fd);
return (0);
}