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|
/* $OpenBSD: sio.c,v 1.2 2011/04/16 10:52:22 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "debug.h"
#include "sio_priv.h"
#define SIO_PAR_MAGIC 0x83b905a4
void
sio_initpar(struct sio_par *par)
{
memset(par, 0xff, sizeof(struct sio_par));
par->__magic = SIO_PAR_MAGIC;
}
struct sio_hdl *
sio_open(const char *str, unsigned mode, int nbio)
{
static char prefix_aucat[] = "aucat";
static char prefix_sun[] = "sun";
struct sio_hdl *hdl;
struct stat sb;
char *sep, buf[NAME_MAX];
int len;
#ifdef DEBUG
sndio_debug_init();
#endif
if ((mode & (SIO_PLAY | SIO_REC)) == 0)
return NULL;
if (str == NULL && !issetugid())
str = getenv("AUDIODEVICE");
if (str == NULL) {
hdl = sio_aucat_open("0", mode, nbio);
if (hdl != NULL)
return hdl;
if (stat("/dev/audio", &sb) == 0 && S_ISCHR(sb.st_mode)) {
snprintf(buf, sizeof(buf), "%u",
minor(sb.st_rdev) & 0xf);
} else
strlcpy(buf, "0", sizeof(buf));
hdl = sio_sun_open(buf, mode, nbio);
if (hdl != NULL)
return hdl;
return NULL;
}
sep = strchr(str, ':');
if (sep == NULL) {
/*
* try legacy "/dev/audioxxx" or ``socket'' device name
*/
if (stat(str, &sb) < 0 || !S_ISCHR(sb.st_mode)) {
snprintf(buf, sizeof(buf), "0.%s", str);
return sio_aucat_open(buf, mode, nbio);
}
snprintf(buf, sizeof(buf), "%u", minor(sb.st_rdev) & 0xf);
return sio_sun_open(buf, mode, nbio);
}
len = sep - str;
if (len == (sizeof(prefix_aucat) - 1) &&
memcmp(str, prefix_aucat, len) == 0)
return sio_aucat_open(sep + 1, mode, nbio);
if (len == (sizeof(prefix_sun) - 1) &&
memcmp(str, prefix_sun, len) == 0)
return sio_sun_open(sep + 1, mode, nbio);
DPRINTF("sio_open: %s: unknown device type\n", str);
return NULL;
}
void
sio_create(struct sio_hdl *hdl, struct sio_ops *ops, unsigned mode, int nbio)
{
hdl->ops = ops;
hdl->mode = mode;
hdl->nbio = nbio;
hdl->started = 0;
hdl->eof = 0;
hdl->move_cb = NULL;
hdl->vol_cb = NULL;
}
void
sio_close(struct sio_hdl *hdl)
{
hdl->ops->close(hdl);
}
int
sio_start(struct sio_hdl *hdl)
{
if (hdl->eof) {
DPRINTF("sio_start: eof\n");
return 0;
}
if (hdl->started) {
DPRINTF("sio_start: already started\n");
hdl->eof = 1;
return 0;
}
#ifdef DEBUG
if (!sio_getpar(hdl, &hdl->par))
return 0;
hdl->pollcnt = hdl->wcnt = hdl->rcnt = hdl->realpos = 0;
gettimeofday(&hdl->tv, NULL);
#endif
if (!hdl->ops->start(hdl))
return 0;
hdl->started = 1;
return 1;
}
int
sio_stop(struct sio_hdl *hdl)
{
if (hdl->eof) {
DPRINTF("sio_stop: eof\n");
return 0;
}
if (!hdl->started) {
DPRINTF("sio_stop: not started\n");
hdl->eof = 1;
return 0;
}
if (!hdl->ops->stop(hdl))
return 0;
#ifdef DEBUG
DPRINTF("libsndio: polls: %llu, written = %llu, read: %llu\n",
hdl->pollcnt, hdl->wcnt, hdl->rcnt);
#endif
hdl->started = 0;
return 1;
}
int
sio_setpar(struct sio_hdl *hdl, struct sio_par *par)
{
if (hdl->eof) {
DPRINTF("sio_setpar: eof\n");
return 0;
}
if (par->__magic != SIO_PAR_MAGIC) {
DPRINTF("sio_setpar: use of uninitialized sio_par structure\n");
hdl->eof = 1;
return 0;
}
if (hdl->started) {
DPRINTF("sio_setpar: already started\n");
hdl->eof = 1;
return 0;
}
if (par->bufsz != ~0U) {
DPRINTF("sio_setpar: setting bufsz is deprecated\n");
par->appbufsz = par->bufsz;
}
if (par->rate != ~0U && par->appbufsz == ~0U)
par->appbufsz = par->rate * 200 / 1000;
return hdl->ops->setpar(hdl, par);
}
int
sio_getpar(struct sio_hdl *hdl, struct sio_par *par)
{
if (hdl->eof) {
DPRINTF("sio_getpar: eof\n");
return 0;
}
if (hdl->started) {
DPRINTF("sio_getpar: already started\n");
hdl->eof = 1;
return 0;
}
if (!hdl->ops->getpar(hdl, par)) {
par->__magic = 0;
return 0;
}
par->__magic = 0;
return 1;
}
int
sio_getcap(struct sio_hdl *hdl, struct sio_cap *cap)
{
if (hdl->eof) {
DPRINTF("sio_getcap: eof\n");
return 0;
}
if (hdl->started) {
DPRINTF("sio_getcap: already started\n");
hdl->eof = 1;
return 0;
}
return hdl->ops->getcap(hdl, cap);
}
static int
sio_psleep(struct sio_hdl *hdl, int event)
{
struct pollfd pfd;
int revents;
for (;;) {
sio_pollfd(hdl, &pfd, event);
while (poll(&pfd, 1, -1) < 0) {
if (errno == EINTR)
continue;
DPERROR("sio_psleep: poll");
hdl->eof = 1;
return 0;
}
revents = sio_revents(hdl, &pfd);
if (revents & POLLHUP) {
DPRINTF("sio_psleep: hang-up\n");
return 0;
}
if (revents & event)
break;
}
return 1;
}
size_t
sio_read(struct sio_hdl *hdl, void *buf, size_t len)
{
unsigned n;
char *data = buf;
size_t todo = len;
if (hdl->eof) {
DPRINTF("sio_read: eof\n");
return 0;
}
if (!hdl->started || !(hdl->mode & SIO_REC)) {
DPRINTF("sio_read: recording not started\n");
hdl->eof = 1;
return 0;
}
if (todo == 0) {
DPRINTF("sio_read: zero length read ignored\n");
return 0;
}
while (todo > 0) {
n = hdl->ops->read(hdl, data, todo);
if (n == 0) {
if (hdl->nbio || hdl->eof || todo < len)
break;
if (!sio_psleep(hdl, POLLIN))
break;
continue;
}
data += n;
todo -= n;
#ifdef DEBUG
hdl->rcnt += n;
#endif
}
return len - todo;
}
size_t
sio_write(struct sio_hdl *hdl, const void *buf, size_t len)
{
unsigned n;
const unsigned char *data = buf;
size_t todo = len;
#ifdef DEBUG
struct timeval tv0, tv1, dtv;
unsigned us;
if (sndio_debug >= 2)
gettimeofday(&tv0, NULL);
#endif
if (hdl->eof) {
DPRINTF("sio_write: eof\n");
return 0;
}
if (!hdl->started || !(hdl->mode & SIO_PLAY)) {
DPRINTF("sio_write: playback not started\n");
hdl->eof = 1;
return 0;
}
if (todo == 0) {
DPRINTF("sio_write: zero length write ignored\n");
return 0;
}
while (todo > 0) {
n = hdl->ops->write(hdl, data, todo);
if (n == 0) {
if (hdl->nbio || hdl->eof)
break;
if (!sio_psleep(hdl, POLLOUT))
break;
continue;
}
data += n;
todo -= n;
#ifdef DEBUG
hdl->wcnt += n;
#endif
}
#ifdef DEBUG
if (sndio_debug >= 2) {
gettimeofday(&tv1, NULL);
timersub(&tv0, &hdl->tv, &dtv);
DPRINTF("%ld.%06ld: ", dtv.tv_sec, dtv.tv_usec);
timersub(&tv1, &tv0, &dtv);
us = dtv.tv_sec * 1000000 + dtv.tv_usec;
DPRINTF(
"sio_write: wrote %d bytes of %d in %uus\n",
(int)(len - todo), (int)len, us);
}
#endif
return len - todo;
}
int
sio_nfds(struct sio_hdl *hdl)
{
return hdl->ops->nfds(hdl);
}
int
sio_pollfd(struct sio_hdl *hdl, struct pollfd *pfd, int events)
{
if (hdl->eof)
return 0;
if (!hdl->started)
events = 0;
return hdl->ops->pollfd(hdl, pfd, events);
}
int
sio_revents(struct sio_hdl *hdl, struct pollfd *pfd)
{
int revents;
#ifdef DEBUG
struct timeval tv0, tv1, dtv;
unsigned us;
if (sndio_debug >= 2)
gettimeofday(&tv0, NULL);
#endif
if (hdl->eof)
return POLLHUP;
#ifdef DEBUG
hdl->pollcnt++;
#endif
revents = hdl->ops->revents(hdl, pfd);
if (!hdl->started)
return revents & POLLHUP;
#ifdef DEBUG
if (sndio_debug >= 2) {
gettimeofday(&tv1, NULL);
timersub(&tv0, &hdl->tv, &dtv);
DPRINTF("%ld.%06ld: ", dtv.tv_sec, dtv.tv_usec);
timersub(&tv1, &tv0, &dtv);
us = dtv.tv_sec * 1000000 + dtv.tv_usec;
DPRINTF("sio_revents: revents = 0x%x, complete in %uus\n",
revents, us);
}
#endif
return revents;
}
int
sio_eof(struct sio_hdl *hdl)
{
return hdl->eof;
}
void
sio_onmove(struct sio_hdl *hdl, void (*cb)(void *, int), void *addr)
{
if (hdl->started) {
DPRINTF("sio_onmove: already started\n");
hdl->eof = 1;
return;
}
hdl->move_cb = cb;
hdl->move_addr = addr;
}
void
sio_onmove_cb(struct sio_hdl *hdl, int delta)
{
#ifdef DEBUG
struct timeval tv0, dtv;
long long playpos;
if (sndio_debug >= 3 && (hdl->mode & SIO_PLAY)) {
gettimeofday(&tv0, NULL);
timersub(&tv0, &hdl->tv, &dtv);
DPRINTF("%ld.%06ld: ", dtv.tv_sec, dtv.tv_usec);
hdl->realpos += delta;
playpos = hdl->wcnt / (hdl->par.bps * hdl->par.pchan);
DPRINTF("sio_onmove_cb: delta = %+7d, "
"plat = %+7lld, "
"realpos = %+7lld, "
"bufused = %+7lld\n",
delta,
playpos - hdl->realpos,
hdl->realpos,
hdl->realpos < 0 ? playpos : playpos - hdl->realpos);
}
#endif
if (hdl->move_cb)
hdl->move_cb(hdl->move_addr, delta);
}
int
sio_setvol(struct sio_hdl *hdl, unsigned ctl)
{
if (hdl->eof)
return 0;
if (!hdl->ops->setvol)
return 1;
if (!hdl->ops->setvol(hdl, ctl))
return 0;
hdl->ops->getvol(hdl);
return 1;
}
int
sio_onvol(struct sio_hdl *hdl, void (*cb)(void *, unsigned), void *addr)
{
if (hdl->started) {
DPRINTF("sio_onvol: already started\n");
hdl->eof = 1;
return 0;
}
if (!hdl->ops->setvol)
return 0;
hdl->vol_cb = cb;
hdl->vol_addr = addr;
hdl->ops->getvol(hdl);
return 1;
}
void
sio_onvol_cb(struct sio_hdl *hdl, unsigned ctl)
{
if (hdl->vol_cb)
hdl->vol_cb(hdl->vol_addr, ctl);
}
|