diff options
Diffstat (limited to 'lib/virtual_oss/sndio/sndio.c')
| -rw-r--r-- | lib/virtual_oss/sndio/sndio.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/lib/virtual_oss/sndio/sndio.c b/lib/virtual_oss/sndio/sndio.c new file mode 100644 index 000000000000..2d1a3411049b --- /dev/null +++ b/lib/virtual_oss/sndio/sndio.c @@ -0,0 +1,203 @@ +/*- + * Copyright (c) 2021 Tim Creech <tcreech@tcreech.com> + * + * 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/soundcard.h> + +#include <err.h> +#include <stdlib.h> +#include <string.h> + +#include <sndio.h> + +#include "backend.h" +#include "int.h" + +static struct sio_hdl * +get_sio_hdl(struct voss_backend *pbe) +{ + if (pbe) + return (pbe->arg); + + return (NULL); +} + +static void +sndio_close(struct voss_backend *pbe) +{ + if (!pbe) + return; + + if (get_sio_hdl(pbe)) + sio_close(get_sio_hdl(pbe)); +} + +static int +sndio_get_signedness(int *fmt) +{ + int s_fmt = *fmt & (VPREFERRED_SLE_AFMT | VPREFERRED_SBE_AFMT); + + if (s_fmt) { + *fmt = s_fmt; + return (1); + } + *fmt = *fmt & (VPREFERRED_ULE_AFMT | VPREFERRED_UBE_AFMT); + return (0); +} + +static int +sndio_get_endianness_is_le(int *fmt) +{ + int le_fmt = *fmt & (VPREFERRED_SLE_AFMT | VPREFERRED_ULE_AFMT); + + if (le_fmt) { + *fmt = le_fmt; + return (1); + } + *fmt = *fmt & (VPREFERRED_SBE_AFMT | VPREFERRED_UBE_AFMT); + return (0); +} + +static int +sndio_get_bits(int *fmt) +{ + if (*fmt & AFMT_16BIT) + return (16); + if (*fmt & AFMT_24BIT) + return (24); + if (*fmt & AFMT_32BIT) + return (32); + if (*fmt & AFMT_8BIT) + return (8); + return (-1); + /* TODO AFMT_BIT */ +} + +static int +sndio_open(struct voss_backend *pbe, const char *devname, + int samplerate, int bufsize, int *pchannels, int *pformat, int direction) +{ + const char *sndio_name = devname + strlen("/dev/sndio/"); + + int sig = sndio_get_signedness(pformat); + int le = sndio_get_endianness_is_le(pformat); + int bits = sndio_get_bits(pformat); + + if (bits == -1) { + warn("unsupported format precision"); + return (-1); + } + + struct sio_hdl *hdl = sio_open(sndio_name, direction, 0); + + if (hdl == 0) { + warn("sndio: failed to open device"); + return (-1); + } + + struct sio_par par; + + sio_initpar(&par); + par.pchan = *pchannels; + par.sig = sig; + par.bits = bits; + par.bps = SIO_BPS(bits); + par.le = le; + par.rate = samplerate; + par.appbufsz = bufsize; + par.xrun = SIO_SYNC; + if (!sio_setpar(hdl, &par)) + errx(1, "internal error, sio_setpar() failed"); + if (!sio_getpar(hdl, &par)) + errx(1, "internal error, sio_getpar() failed"); + if ((int)par.pchan != *pchannels) + errx(1, "couldn't set number of channels"); + if ((int)par.sig != sig || (int)par.bits != bits || (int)par.le != le) + errx(1, "couldn't set format"); + if ((int)par.bits != bits) + errx(1, "couldn't set precision"); + if ((int)par.rate < samplerate * 995 / 1000 || + (int)par.rate > samplerate * 1005 / 1000) + errx(1, "couldn't set rate"); + if (par.xrun != SIO_SYNC) + errx(1, "couldn't set xun policy"); + + /* Save the device handle with the backend */ + pbe->arg = hdl; + + /* Start the device. */ + if (!sio_start(hdl)) + errx(1, "couldn't start device"); + + return (0); +} + +static int +sndio_open_play(struct voss_backend *pbe, const char *devname, + int samplerate, int bufsize, int *pchannels, int *pformat) +{ + return (sndio_open(pbe, devname, samplerate, bufsize, pchannels, pformat, SIO_PLAY)); +} + +static int +sndio_open_rec(struct voss_backend *pbe, const char *devname, + int samplerate, int bufsize, int *pchannels, int *pformat) +{ + return (sndio_open(pbe, devname, samplerate, bufsize, pchannels, pformat, SIO_REC)); +} + +static int +sndio_play_transfer(struct voss_backend *pbe, void *ptr, int len) +{ + return (sio_write(get_sio_hdl(pbe), ptr, len)); +} + +static int +sndio_rec_transfer(struct voss_backend *pbe, void *ptr, int len) +{ + return (sio_read(get_sio_hdl(pbe), ptr, len)); +} + +static void +sndio_delay(struct voss_backend *pbe __unused, int *pdelay) +{ + *pdelay = -1; +} + +struct voss_backend voss_backend_sndio_rec = { + .open = sndio_open_rec, + .close = sndio_close, + .transfer = sndio_rec_transfer, + .delay = sndio_delay, + .fd = -1, +}; + +struct voss_backend voss_backend_sndio_play = { + .open = sndio_open_play, + .close = sndio_close, + .transfer = sndio_play_transfer, + .delay = sndio_delay, + .fd = -1, +}; |