337 lines
8.1 KiB
C
337 lines
8.1 KiB
C
/* $OpenBSD: ossaudio.c,v 1.21 2020/04/02 19:57:10 ratchov Exp $ */
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/* $NetBSD: ossaudio.c,v 1.14 2001/05/10 01:53:48 augustss Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This is an OSS (Linux) sound API emulator.
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* It provides the essentials of the API.
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*/
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#include <stdarg.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <poll.h>
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#include <sndio.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "soundcard.h"
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#ifdef DEBUG
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#define DPRINTF(...) do { fprintf(stderr, __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(...) do {} while (0)
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#endif
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#define GET_DEV(com) ((com) & 0xff)
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#define INTARG (*(int*)argp)
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struct control {
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struct control *next;
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int type; /* one of SOUND_MIXER_xxx */
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int chan; /* 0 -> left, 1 -> right, -1 -> mono */
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int addr; /* sioctl control id */
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int value; /* current value */
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int max;
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};
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static int mixer_ioctl(int, unsigned long, void *);
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static int initialized;
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static struct control *controls;
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static struct sioctl_hdl *hdl;
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static char *dev_name = SIO_DEVANY;
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static struct pollfd *pfds;
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int
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_oss_ioctl(int fd, unsigned long com, ...)
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{
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va_list ap;
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void *argp;
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va_start(ap, com);
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argp = va_arg(ap, void *);
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va_end(ap);
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if (IOCGROUP(com) == 'P')
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return ENOTTY;
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else if (IOCGROUP(com) == 'M')
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return mixer_ioctl(fd, com, argp);
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else
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return (ioctl)(fd, com, argp);
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}
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/*
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* new control
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*/
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static void
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mixer_ondesc(void *unused, struct sioctl_desc *d, int val)
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{
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struct control *i, **pi;
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int type;
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if (d == NULL)
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return;
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/*
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* delete existing control with the same address
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*/
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for (pi = &controls; (i = *pi) != NULL; pi = &i->next) {
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if (d->addr == i->addr) {
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*pi = i->next;
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free(i);
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break;
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}
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}
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/*
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* we support only numeric "level" controls, first 2 channels
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*/
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if (d->type != SIOCTL_NUM || d->node0.unit >= 2 ||
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strcmp(d->func, "level") != 0)
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return;
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/*
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* We expose top-level input.level and output.level as OSS
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* volume and microphone knobs. By default sndiod exposes
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* the underlying hardware knobs as hw/input.level and
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* hw/output.level that we map to OSS gain controls. This
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* ensures useful knobs are exposed no matter if sndiod
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* is running or not.
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*/
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if (d->group[0] == 0) {
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if (strcmp(d->node0.name, "output") == 0)
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type = SOUND_MIXER_VOLUME;
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else if (strcmp(d->node0.name, "input") == 0)
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type = SOUND_MIXER_MIC;
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else
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return;
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} else if (strcmp(d->group, "hw") == 0) {
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if (strcmp(d->node0.name, "output") == 0)
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type = SOUND_MIXER_OGAIN;
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else if (strcmp(d->node0.name, "input") == 0)
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type = SOUND_MIXER_IGAIN;
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else
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return;
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} else
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return;
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i = malloc(sizeof(struct control));
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if (i == NULL) {
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DPRINTF("%s: cannot allocate control\n", __func__);
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return;
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}
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i->addr = d->addr;
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i->chan = d->node0.unit;
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i->max = d->maxval;
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i->value = val;
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i->type = type;
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i->next = controls;
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controls = i;
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DPRINTF("%s: %d: used as %d, chan = %d, value = %d\n", __func__,
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i->addr, i->type, i->chan, i->value);
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}
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/*
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* control value changed
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*/
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static void
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mixer_onval(void *unused, unsigned int addr, unsigned int value)
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{
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struct control *c;
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for (c = controls; ; c = c->next) {
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if (c == NULL) {
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DPRINTF("%s: %d: change ignored\n", __func__, addr);
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return;
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}
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if (c->addr == addr)
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break;
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}
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DPRINTF("%s: %d: changed to %d\n", __func__, addr, value);
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c->value = value;
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}
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static int
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mixer_init(void)
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{
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if (initialized)
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return hdl != NULL;
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initialized = 1;
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hdl = sioctl_open(dev_name, SIOCTL_READ | SIOCTL_WRITE, 0);
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if (hdl == NULL) {
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DPRINTF("%s: cannot open audio control device\n", __func__);
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return 0;
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}
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pfds = calloc(sioctl_nfds(hdl), sizeof(struct pollfd));
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if (pfds == NULL) {
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DPRINTF("%s: cannot allocate pfds\n", __func__);
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goto bad_close;
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}
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if (!sioctl_ondesc(hdl, mixer_ondesc, NULL)) {
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DPRINTF("%s: cannot get controls descriptions\n", __func__);
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goto bad_free;
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}
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if (!sioctl_onval(hdl, mixer_onval, NULL)) {
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DPRINTF("%s: cannot get controls values\n", __func__);
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goto bad_free;
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}
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return 1;
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bad_free:
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free(pfds);
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bad_close:
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sioctl_close(hdl);
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return 0;
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}
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static int
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mixer_ioctl(int fd, unsigned long com, void *argp)
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{
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struct control *c;
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struct mixer_info *omi;
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int idat = 0;
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int v, n;
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if (!mixer_init()) {
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DPRINTF("%s: not initialized\n", __func__);
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errno = EIO;
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return -1;
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}
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n = sioctl_pollfd(hdl, pfds, POLLIN);
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if (n > 0) {
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n = poll(pfds, n, 0);
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if (n == -1)
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return -1;
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if (n > 0)
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sioctl_revents(hdl, pfds);
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}
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switch (com) {
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case OSS_GETVERSION:
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idat = SOUND_VERSION;
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break;
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case SOUND_MIXER_INFO:
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case SOUND_OLD_MIXER_INFO:
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omi = argp;
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if (com == SOUND_MIXER_INFO)
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omi->modify_counter = 1;
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strlcpy(omi->id, dev_name, sizeof omi->id);
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strlcpy(omi->name, dev_name, sizeof omi->name);
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return 0;
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case SOUND_MIXER_READ_RECSRC:
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case SOUND_MIXER_READ_RECMASK:
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idat = 0;
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for (c = controls; c != NULL; c = c->next)
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idat |= 1 << c->type;
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idat &= (1 << SOUND_MIXER_MIC) | (1 << SOUND_MIXER_IGAIN);
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DPRINTF("%s: SOUND_MIXER_READ_RECSRC: %d\n", __func__, idat);
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break;
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case SOUND_MIXER_READ_DEVMASK:
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idat = 0;
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for (c = controls; c != NULL; c = c->next)
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idat |= 1 << c->type;
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DPRINTF("%s: SOUND_MIXER_READ_DEVMASK: %d\n", __func__, idat);
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break;
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case SOUND_MIXER_READ_STEREODEVS:
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idat = 0;
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for (c = controls; c != NULL; c = c->next) {
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if (c->chan == 1)
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idat |= 1 << c->type;
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}
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DPRINTF("%s: SOUND_MIXER_STEREODEVS: %d\n", __func__, idat);
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break;
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case SOUND_MIXER_READ_CAPS:
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idat = 0;
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DPRINTF("%s: SOUND_MIXER_READ_CAPS: %d\n", __func__, idat);
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break;
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case SOUND_MIXER_WRITE_RECSRC:
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case SOUND_MIXER_WRITE_R_RECSRC:
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DPRINTF("%s: SOUND_MIXER_WRITE_RECSRC\n", __func__);
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errno = EINVAL;
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return -1;
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default:
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if (MIXER_READ(SOUND_MIXER_FIRST) <= com &&
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com < MIXER_READ(SOUND_MIXER_NRDEVICES)) {
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doread:
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idat = 0;
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n = GET_DEV(com);
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for (c = controls; c != NULL; c = c->next) {
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if (c->type != n)
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continue;
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v = (c->value * 100 + c->max / 2) / c->max;
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if (c->chan == 1)
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v <<= 8;
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idat |= v;
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}
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DPRINTF("%s: MIXER_READ: %d: 0x%04x\n",
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__func__, n, idat);
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break;
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} else if ((MIXER_WRITE_R(SOUND_MIXER_FIRST) <= com &&
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com < MIXER_WRITE_R(SOUND_MIXER_NRDEVICES)) ||
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(MIXER_WRITE(SOUND_MIXER_FIRST) <= com &&
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com < MIXER_WRITE(SOUND_MIXER_NRDEVICES))) {
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idat = INTARG;
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n = GET_DEV(com);
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for (c = controls; c != NULL; c = c->next) {
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if (c->type != n)
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continue;
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v = idat;
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if (c->chan == 1)
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v >>= 8;
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v &= 0xff;
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if (v > 100)
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v = 100;
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v = (v * c->max + 50) / 100;
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sioctl_setval(hdl, c->addr, v);
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DPRINTF("%s: MIXER_WRITE: %d: %d\n",
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__func__, n, v);
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}
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if (MIXER_WRITE(SOUND_MIXER_FIRST) <= com &&
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com < MIXER_WRITE(SOUND_MIXER_NRDEVICES))
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return 0;
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goto doread;
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} else {
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errno = EINVAL;
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return -1;
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}
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}
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INTARG = idat;
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return 0;
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}
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