diff options
Diffstat (limited to 'lib/virtual_oss/oss/oss.c')
| -rw-r--r-- | lib/virtual_oss/oss/oss.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/lib/virtual_oss/oss/oss.c b/lib/virtual_oss/oss/oss.c new file mode 100644 index 000000000000..b4779f9108d9 --- /dev/null +++ b/lib/virtual_oss/oss/oss.c @@ -0,0 +1,197 @@ +/*- + * Copyright (c) 2015-2019 Hans Petter Selasky + * + * 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/queue.h> +#include <sys/filio.h> +#include <sys/soundcard.h> + +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> +#include <err.h> +#include <poll.h> + +#include "backend.h" +#include "int.h" + +static int +oss_set_format(int fd, int *format) +{ + int value[6]; + int error; + int fmt; + int i; + + value[0] = *format & VPREFERRED_SNE_AFMT; + value[1] = *format & VPREFERRED_UNE_AFMT; + value[2] = *format & VPREFERRED_SLE_AFMT; + value[3] = *format & VPREFERRED_SBE_AFMT; + value[4] = *format & VPREFERRED_ULE_AFMT; + value[5] = *format & VPREFERRED_UBE_AFMT; + + for (i = 0; i != 6; i++) { + fmt = value[i]; + if (fmt == 0) + continue; + error = ioctl(fd, SNDCTL_DSP_SETFMT, &fmt); + /* make sure we got the format we asked for */ + if (error == 0 && fmt == value[i]) { + *format = fmt; + return (0); + } + } + return (-1); +} + +static void +oss_close(struct voss_backend *pbe) +{ + if (pbe->fd > -1) { + close(pbe->fd); + pbe->fd = -1; + } +} + +static int +oss_open(struct voss_backend *pbe, const char *devname, int samplerate, + int bufsize, int *pchannels, int *pformat, int attr, int fionbio) +{ + int temp; + int err; + + pbe->fd = open(devname, attr); + if (pbe->fd < 0) { + warn("Could not open DSP device '%s'", devname); + return (-1); + } + err = ioctl(pbe->fd, FIONBIO, &fionbio); + if (err < 0) { + warn("Could not set blocking mode on DSP"); + goto error; + } + err = oss_set_format(pbe->fd, pformat); + if (err < 0) { + warn("Could not set sample format 0x%08x", *pformat); + goto error; + } + temp = *pchannels; + bufsize /= temp; /* get buffer size per channel */ + do { + err = ioctl(pbe->fd, SOUND_PCM_WRITE_CHANNELS, &temp); + } while (err < 0 && --temp > 0); + + err = ioctl(pbe->fd, SOUND_PCM_READ_CHANNELS, &temp); + if (err < 0 || temp <= 0 || temp > *pchannels) { + warn("Could not set DSP channels: %d / %d", temp, *pchannels); + goto error; + } + *pchannels = temp; + + temp = samplerate; + err = ioctl(pbe->fd, SNDCTL_DSP_SPEED, &temp); + if (err < 0 || temp != samplerate) { + warn("Could not set sample rate to %d / %d Hz", temp, samplerate); + goto error; + } + + temp = bufsize * (*pchannels); + err = ioctl(pbe->fd, SNDCTL_DSP_SETBLKSIZE, &temp); + if (err < 0) { + warn("Could not set block size to %d", temp); + goto error; + } + return (0); +error: + close(pbe->fd); + pbe->fd = -1; + return (-1); +} + +static int +oss_rec_open(struct voss_backend *pbe, const char *devname, int samplerate, + int bufsize, int *pchannels, int *pformat) +{ + return (oss_open(pbe, devname, samplerate, bufsize, pchannels, pformat, O_RDONLY, 0)); +} + +static int +oss_play_open(struct voss_backend *pbe, const char *devname, int samplerate, + int bufsize, int *pchannels, int *pformat) +{ + bufsize *= 4; /* XXX allow extra space for jitter */ + return (oss_open(pbe, devname, samplerate, bufsize, pchannels, pformat, O_WRONLY, 0)); +} + +static int +oss_rec_transfer(struct voss_backend *pbe, void *ptr, int len) +{ + struct pollfd fds = { .fd = pbe->fd, .events = POLLIN | POLLRDNORM }; + int err; + + /* wait at maximum 2 seconds for data, else something is wrong */ + err = poll(&fds, 1, 2000); + if (err < 1) + return (-1); + return (read(pbe->fd, ptr, len)); +} + +static int +oss_play_transfer(struct voss_backend *pbe, void *ptr, int len) +{ + return (write(pbe->fd, ptr, len)); +} + +static void +oss_rec_delay(struct voss_backend *pbe, int *pdelay) +{ + if (ioctl(pbe->fd, FIONREAD, pdelay) != 0) + *pdelay = -1; +} + +static void +oss_play_delay(struct voss_backend *pbe, int *pdelay) +{ + if (voss_has_synchronization != 0 || + ioctl(pbe->fd, SNDCTL_DSP_GETODELAY, pdelay) != 0) + *pdelay = -1; +} + +struct voss_backend voss_backend_oss_rec = { + .open = oss_rec_open, + .close = oss_close, + .transfer = oss_rec_transfer, + .delay = oss_rec_delay, + .fd = -1, +}; + +struct voss_backend voss_backend_oss_play = { + .open = oss_play_open, + .close = oss_close, + .transfer = oss_play_transfer, + .delay = oss_play_delay, + .fd = -1, +}; |