diff --git a/share/examples/sound/oss/audio.c b/share/examples/sound/oss/audio.c deleted file mode 100644 --- a/share/examples/sound/oss/audio.c +++ /dev/null @@ -1,310 +0,0 @@ -/* - * 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 - * 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 - -#include -#include -#include -#include -#include -#include -#include - -#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/kqueue.c b/share/examples/sound/oss/kqueue.c new file mode 100644 --- /dev/null +++ b/share/examples/sound/oss/kqueue.c @@ -0,0 +1,78 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2025 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 + +#include "oss.h" + +int +main(int argc, char *argv[]) +{ + int fd, ret, bytes, kq; + struct kevent event = {}; + struct config config = { + .device = "/dev/dsp", + .mode = O_RDWR, + .format = AFMT_S32_NE, + .sample_rate = 48000, + .mmap = 0, + }; + + /* Initialize device */ + oss_init(&config); + bytes = config.buffer_info.bytes; + + kq = kqueue(); + if (kq == -1) + err(1, "Failed to allocate kqueue"); + EV_SET(&event, fd, EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, 0); + ret = kevent(kq, &event, 1, NULL, 0, NULL); + if (ret == -1) + err(1, "Failed to register kevent"); + for (;;) { + ret = kevent(kq, 0, 0, &event, 1, 0); + if (ret == -1 || event.data == 0) + err(1, "Event error"); + if (event.flags & EV_ERROR) + err(1, "Event error: %s", strerror(event.data)); + if (read(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but read %d!\n", bytes, ret); + if (write(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but wrote %d!\n", bytes, ret); + } + EV_SET(&event, fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0); + ret = kevent(kq, &event, 1, NULL, 0, NULL); + if (ret == -1) + err(1, "Failed to unregister kevent"); + close(kq); + + /* Cleanup */ + free(config.buf); + close(config.fd); + + return (0); +} diff --git a/share/examples/sound/oss/oss.h b/share/examples/sound/oss/oss.h new file mode 100644 --- /dev/null +++ b/share/examples/sound/oss/oss.h @@ -0,0 +1,174 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2025 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 +#include +#include +#include +#include +#include +#include + +/* + * Minimal configuration for OSS + * For real world applications, this structure will probably contain many + * more fields + */ +struct config { + char *device; + int mode; + int fd; + int format; + int sample_count; + int sample_rate; + int sample_size; + int chsamples; + int mmap; + void *buf; + oss_audioinfo audio_info; + audio_buf_info buffer_info; +}; + +/* Calculate frag by giving it the buffer size */ +static inline int +size2frag(int x) +{ + int frag = 0; + + while ((1 << frag) < x) + frag++; + + return (frag); +} + +static void +oss_init(struct config *config) { + int tmp = 0; + unsigned long request = SNDCTL_DSP_GETOSPACE; + + if ((config->fd = open(config->device, config->mode)) < 0) + err(1, "Error opening the device %s", config->device); + + /* Get device information */ + if (ioctl(config->fd, SNDCTL_ENGINEINFO, &config->audio_info) != 0) + err(1, "Unable to get device info"); + + /* Get device capabilities */ + if (ioctl(config->fd, SNDCTL_DSP_GETCAPS, &config->audio_info.caps) != 0) + err(1, "Unable to get capabilities"); + + /* Check if device supports triggering */ + if (!(config->audio_info.caps & PCM_CAP_TRIGGER)) + errx(1, "Device doesn't support triggering!\n"); + + /* Handle memory mapped mode */ + if (config->mmap) { + if (!(config->audio_info.caps & PCM_CAP_MMAP)) + errx(1, "Device doesn't support mmap mode!\n"); + tmp = 0; + if (ioctl(config->fd, SNDCTL_DSP_COOKEDMODE, &tmp) != 0) + err(1, "Unable to set cooked mode"); + } + + /* Set sample format */ + if (ioctl(config->fd, SNDCTL_DSP_SETFMT, &config->format) != 0) + err(1, "Unable to set sample format"); + + /* Set channels */ + if (ioctl(config->fd, SNDCTL_DSP_CHANNELS, &config->audio_info.max_channels) != 0) + err(1, "Unable to set channels"); + + /* Set sample rate */ + if (ioctl(config->fd, SNDCTL_DSP_SPEED, &config->sample_rate) != 0) + err(1, "Unable to set sample rate"); + + /* Calculate sample size */ + switch (config->format) { + case AFMT_S8: + config->sample_size = 1; + break; + case AFMT_S16_BE: + case AFMT_S16_LE: + config->sample_size = 2; + break; + case AFMT_S32_BE: + case AFMT_S32_LE: + config->sample_size = 4; + break; + default: + errx(1, "Invalid audio format %d", config->format); + break; + } + + /* Set fragment and sample size */ + config->buffer_info.fragments = 2; + tmp = size2frag(config->sample_size * config->audio_info.max_channels); + tmp = ((config->buffer_info.fragments) << 16) | tmp; + if (ioctl(config->fd, SNDCTL_DSP_SETFRAGMENT, &tmp) != 0) + err(1, "Unable to set fragment size"); + + /* Get buffer info */ + if ((config->mode & O_ACCMODE) == O_RDONLY) + request = SNDCTL_DSP_GETISPACE; + if (ioctl(config->fd, request, &config->buffer_info) != 0) + err(1, "Unable to get buffer info"); + if (config->buffer_info.fragments < 1) + config->buffer_info.fragments = config->buffer_info.fragstotal; + if (config->buffer_info.bytes < 1) + config->buffer_info.bytes = config->buffer_info.fragstotal * config->buffer_info.fragsize; + 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->audio_info.max_channels; + config->buf = malloc(config->buffer_info.bytes); + + printf("bytes: %d, fragments: %d, fragsize: %d, fragstotal: %d, " + "samples: %d\n", + config->buffer_info.bytes, config->buffer_info.fragments, + config->buffer_info.fragsize, config->buffer_info.fragstotal, + config->sample_count); + + /* Set the trigger */ + switch (config->mode & O_ACCMODE) { + case O_RDONLY: + tmp = PCM_ENABLE_INPUT; + break; + case O_WRONLY: + tmp = PCM_ENABLE_OUTPUT; + break; + case O_RDWR: + tmp = PCM_ENABLE_INPUT | PCM_ENABLE_OUTPUT; + break; + default: + errx(1, "Invalid mode %d", config->mode); + break; + } + if (ioctl(config->fd, SNDCTL_DSP_SETTRIGGER, &tmp) != 0) + err(1, "Failed to set trigger"); +} diff --git a/share/examples/sound/oss/poll.c b/share/examples/sound/oss/poll.c new file mode 100644 --- /dev/null +++ b/share/examples/sound/oss/poll.c @@ -0,0 +1,66 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2025 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 + +#include "oss.h" + +int +main(int argc, char *argv[]) +{ + int fd, ret, bytes; + struct pollfd pfds[1]; + struct config config = { + .device = "/dev/dsp", + .mode = O_RDWR, + .format = AFMT_S32_NE, + .sample_rate = 48000, + .mmap = 0, + }; + + /* Initialize device */ + oss_init(&config); + bytes = config.buffer_info.bytes; + + for (;;) { + pfds[0].fd = config.fd; + pfds[0].events = POLLOUT; + ret = poll(pfds, sizeof(pfds) / sizeof(struct pollfd), -1); + if (pfds[0].revents != 0) { + if (read(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but read %d!\n", bytes, ret); + if (write(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but wrote %d!\n", bytes, ret); + } + } + + /* Cleanup */ + free(config.buf); + close(config.fd); + + return (0); +} diff --git a/share/examples/sound/oss/select.c b/share/examples/sound/oss/select.c new file mode 100644 --- /dev/null +++ b/share/examples/sound/oss/select.c @@ -0,0 +1,66 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2025 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 + +#include "oss.h" + +int +main(int argc, char *argv[]) +{ + int fd, ret, bytes; + fd_set fds; + struct config config = { + .device = "/dev/dsp", + .mode = O_RDWR, + .format = AFMT_S32_NE, + .sample_rate = 48000, + .mmap = 0, + }; + + /* Initialize device */ + oss_init(&config); + bytes = config.buffer_info.bytes; + + for (;;) { + FD_ZERO(&fds); + FD_SET(config.fd, &fds); + ret = select(config.fd + 1, &fds, NULL, NULL, NULL); + if (FD_ISSET(config.fd, &fds)) { + if (read(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but read %d!\n", bytes, ret); + if (write(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but wrote %d!\n", bytes, ret); + } + } + + /* Cleanup */ + free(config.buf); + close(config.fd); + + return (0); +} diff --git a/share/examples/sound/oss/simple.c b/share/examples/sound/oss/simple.c new file mode 100644 --- /dev/null +++ b/share/examples/sound/oss/simple.c @@ -0,0 +1,99 @@ +/* + * 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 + * 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 "oss.h" + +/* + * 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 +to_channels(struct config *config, int32_t *input, int32_t *output) { + int channel, index, i; + + for (i = 0; i < config->sample_count; i++) { + channel = i % config->audio_info.max_channels; + index = i / config->audio_info.max_channels; + output[channel * index] = input[i]; + } +} + +/* + * Convert channels into interleaved format and place it in output + * buffer + */ +static void +to_interleaved(struct config *config, int32_t *input, int32_t *output) { + int channel, index; + + for (channel = 0; channel < config->audio_info.max_channels; channel++) + for (index = 0; index < config->chsamples; index++) + output[index * config->audio_info.max_channels + channel] = + input[channel * index]; +} + +int +main(int argc, char *argv[]) +{ + int fd, ret, bytes; + int32_t *channels; + struct config config = { + .device = "/dev/dsp", + .mode = O_RDWR, + .format = AFMT_S32_NE, + .sample_rate = 48000, + .mmap = 0, + }; + + /* Initialize device */ + oss_init(&config); + bytes = config.buffer_info.bytes; + channels = malloc(bytes); + + for (;;) { + if (read(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but read %d!\n", bytes, ret); + to_channels(&config, (int32_t *)config.buf, channels); + /* All processing will happen here */ + to_interleaved(&config, channels, (int32_t *)config.buf); + if (write(config.fd, config.buf, bytes) < bytes) + err(1, "Requested %d bytes, but wrote %d!\n", bytes, ret); + } + + /* Cleanup */ + free(channels); + free(config.buf); + close(config.fd); + + return (0); +}