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diff --git a/share/examples/Makefile b/share/examples/Makefile
--- a/share/examples/Makefile
+++ b/share/examples/Makefile
@@ -320,9 +320,8 @@
SE_DIRS+= sound/oss
SE_SOUND_OSS= \
README \
- basic.c \
- midi.c \
- ossinit.h
+ audio.c \
+ midi.c
SE_DIRS+= sunrpc
SE_SUNRPC= Makefile
diff --git a/share/examples/sound/oss/audio.c b/share/examples/sound/oss/audio.c
new file mode 100644
--- /dev/null
+++ b/share/examples/sound/oss/audio.c
@@ -0,0 +1,310 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 Goran Mekić
+ * Copyright (c) 2024 The FreeBSD Foundation
+ *
+ * Portions of this software were 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/soundcard.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifndef SAMPLE_SIZE
+#define SAMPLE_SIZE 16
+#endif
+
+/* Format can be unsigned, in which case replace S with U */
+#if SAMPLE_SIZE == 32
+typedef int32_t sample_t;
+int format = AFMT_S32_NE; /* Signed 32bit native endian format */
+#elif SAMPLE_SIZE == 16
+typedef int16_t sample_t;
+int format = AFMT_S16_NE; /* Signed 16bit native endian format */
+#elif SAMPLE_SIZE == 8
+typedef int8_t sample_t;
+int format = AFMT_S8_NE; /* Signed 8bit native endian format */
+#else
+#error Unsupported sample format!
+typedef int32_t sample_t;
+int format = AFMT_S32_NE; /* Not a real value, just silencing
+ * compiler errors */
+#endif
+
+/*
+ * Minimal configuration for OSS
+ * For real world applications, this structure will probably contain many
+ * more fields
+ */
+typedef struct config {
+ char *device;
+ int channels;
+ int fd;
+ int format;
+ int frag;
+ int sample_count;
+ int sample_rate;
+ int sample_size;
+ int chsamples;
+ int mmap;
+ oss_audioinfo audio_info;
+ audio_buf_info buffer_info;
+} config_t;
+
+/*
+ * Error state is indicated by value=-1 in which case application exits with
+ * error
+ */
+static inline void
+check_error(const int value, const char *message)
+{
+ if (value == -1)
+ err(1, "OSS error: %s\n", message);
+}
+
+
+/* Calculate frag by giving it minimal size of buffer */
+static inline int
+size2frag(int x)
+{
+ int frag = 0;
+
+ while ((1 << frag) < x)
+ ++frag;
+
+ return (frag);
+}
+
+/*
+ * Split input buffer into channels. Input buffer is in interleaved format
+ * which means if we have 2 channels (L and R), this is what the buffer of 8
+ * samples would contain: L,R,L,R,L,R,L,R. The result are two channels
+ * containing: L,L,L,L and R,R,R,R.
+ */
+static void
+oss_split(config_t *config, sample_t *input, sample_t *output)
+{
+ int channel, index, i;
+
+ for (i = 0; i < config->sample_count; ++i) {
+ channel = i % config->channels;
+ index = i / config->channels;
+ output[channel * index] = input[i];
+ }
+}
+
+/*
+ * Convert channels into interleaved format and place it in output
+ * buffer
+ */
+static void
+oss_merge(config_t *config, sample_t *input, sample_t *output)
+{
+ int channel, index;
+
+ for (channel = 0; channel < config->channels; ++channel) {
+ for (index = 0; index < config->chsamples; ++index) {
+ output[index * config->channels + channel] =
+ input[channel * index];
+ }
+ }
+}
+
+static void
+oss_init(config_t *config)
+{
+ int error, tmp, min_frag;
+
+ /* Open the device for read and write */
+ config->fd = open(config->device, O_RDWR);
+ check_error(config->fd, "open");
+
+ /* Get device information */
+ config->audio_info.dev = -1;
+ error = ioctl(config->fd, SNDCTL_ENGINEINFO, &(config->audio_info));
+ check_error(error, "SNDCTL_ENGINEINFO");
+ printf("min_channels: %d\n", config->audio_info.min_channels);
+ printf("max_channels: %d\n", config->audio_info.max_channels);
+ printf("latency: %d\n", config->audio_info.latency);
+ printf("handle: %s\n", config->audio_info.handle);
+ if (config->audio_info.min_rate > config->sample_rate ||
+ config->sample_rate > config->audio_info.max_rate) {
+ errx(1, "%s doesn't support chosen samplerate of %dHz!\n",
+ config->device, config->sample_rate);
+ }
+ if (config->channels < 1)
+ config->channels = config->audio_info.max_channels;
+
+ /*
+ * If device is going to be used in mmap mode, disable all format
+ * conversions. Official OSS documentation states error code should not
+ * be checked.
+ * http://manuals.opensound.com/developer/mmap_test.c.html#LOC10
+ */
+ if (config->mmap) {
+ tmp = 0;
+ ioctl(config->fd, SNDCTL_DSP_COOKEDMODE, &tmp);
+ }
+
+ /*
+ * Set number of channels. If number of channels is chosen to the value
+ * near the one wanted, save it in config
+ */
+ tmp = config->channels;
+ error = ioctl(config->fd, SNDCTL_DSP_CHANNELS, &tmp);
+ check_error(error, "SNDCTL_DSP_CHANNELS");
+ /* Or check if tmp is close enough? */
+ if (tmp != config->channels) {
+ errx(1, "%s doesn't support chosen channel count of %d set "
+ "to %d!\n", config->device, config->channels, tmp);
+ }
+ config->channels = tmp;
+
+ /* Set format, or bit size: 8, 16, 24 or 32 bit sample */
+ tmp = config->format;
+ error = ioctl(config->fd, SNDCTL_DSP_SETFMT, &tmp);
+ check_error(error, "SNDCTL_DSP_SETFMT");
+ if (tmp != config->format) {
+ errx(1, "%s doesn't support chosen sample format!\n",
+ config->device);
+ }
+
+ /* Most common values for samplerate (in kHz): 44.1, 48, 88.2, 96 */
+ tmp = config->sample_rate;
+ error = ioctl(config->fd, SNDCTL_DSP_SPEED, &tmp);
+ check_error(error, "SNDCTL_DSP_SPEED");
+
+ /* Get and check device capabilities */
+ error = ioctl(config->fd, SNDCTL_DSP_GETCAPS, &(config->audio_info.caps));
+ check_error(error, "SNDCTL_DSP_GETCAPS");
+ if (!(config->audio_info.caps & PCM_CAP_DUPLEX))
+ errx(1, "Device doesn't support full duplex!\n");
+
+ if (config->mmap) {
+ if (!(config->audio_info.caps & PCM_CAP_TRIGGER))
+ errx(1, "Device doesn't support triggering!\n");
+ if (!(config->audio_info.caps & PCM_CAP_MMAP))
+ errx(1, "Device doesn't support mmap mode!\n");
+ }
+
+ /*
+ * If desired frag is smaller than minimum, based on number of channels
+ * and format (size in bits: 8, 16, 24, 32), set that as frag. Buffer
+ * size is 2^frag, but the real size of the buffer will be read when
+ * the configuration of the device is successful
+ */
+ min_frag = size2frag(config->sample_size * config->channels);
+
+ if (config->frag < min_frag)
+ config->frag = min_frag;
+
+ /*
+ * Allocate buffer in fragments. Total buffer will be split in number
+ * of fragments (2 by default)
+ */
+ if (config->buffer_info.fragments < 0)
+ config->buffer_info.fragments = 2;
+ tmp = ((config->buffer_info.fragments) << 16) | config->frag;
+ error = ioctl(config->fd, SNDCTL_DSP_SETFRAGMENT, &tmp);
+ check_error(error, "SNDCTL_DSP_SETFRAGMENT");
+
+ /* When all is set and ready to go, get the size of buffer */
+ error = ioctl(config->fd, SNDCTL_DSP_GETOSPACE, &(config->buffer_info));
+ check_error(error, "SNDCTL_DSP_GETOSPACE");
+ if (config->buffer_info.bytes < 1) {
+ errx(1, "OSS buffer error: buffer size can not be %d\n",
+ config->buffer_info.bytes);
+ }
+ config->sample_count = config->buffer_info.bytes / config->sample_size;
+ config->chsamples = config->sample_count / config->channels;
+}
+
+int
+main(int argc, char *argv[])
+{
+ int ret, bytes;
+ int8_t *ibuf, *obuf;
+ 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
+ */
+ bytes = config.buffer_info.bytes;
+ ibuf = malloc(bytes);
+ 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);
+}
diff --git a/share/examples/sound/oss/basic.c b/share/examples/sound/oss/basic.c
deleted file mode 100644
--- a/share/examples/sound/oss/basic.c
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * 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);
-}

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