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#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <poll.h>
#include <termios.h>
#include <sndio.h>
#include "tools.h"
#define BUFSZ 0x100
unsigned char buf[BUFSZ];
struct sio_par par;
unsigned vol = 0xdeadbeef;
void
usage(void) {
fprintf(stderr, "usage: vol [-r rate] [-c nchan] [-e enc]\n");
}
void
onvol(void *addr, unsigned val)
{
vol = val;
fprintf(stderr, "volume set to %u\n", vol);
}
int
main(int argc, char **argv) {
int ch;
int tty;
struct sio_hdl *hdl;
struct termios tio;
struct pollfd pfd[2];
char cmd;
ssize_t n, len;
/*
* defaults parameters
*/
sio_initpar(&par);
par.sig = 1;
par.bits = 16;
par.pchan = 2;
par.rate = 44100;
if (isatty(STDIN_FILENO)) {
fprintf(stderr, "stdin can't be a tty\n");
exit(1);
}
tty = open("/dev/tty", O_RDWR);
if (tty < 0) {
perror("/dev/tty");
exit(1);
}
if (tcgetattr(tty, &tio) < 0) {
perror("tcsetattr");
exit(1);
}
tio.c_lflag &= ~ICANON;
tio.c_lflag &= ~ECHO;
tio.c_cc[VMIN] = 1;
tio.c_cc[VTIME] = 0;
if (tcsetattr(tty, TCSAFLUSH, &tio) < 0) {
perror("tcsetattr");
exit(1);
}
while ((ch = getopt(argc, argv, "r:c:e:b:x:")) != -1) {
switch(ch) {
case 'r':
if (sscanf(optarg, "%u", &par.rate) != 1) {
fprintf(stderr, "%s: bad rate\n", optarg);
exit(1);
}
break;
case 'c':
if (sscanf(optarg, "%u", &par.pchan) != 1) {
fprintf(stderr, "%s: bad channels\n", optarg);
exit(1);
}
break;
case 'e':
if (!sio_strtoenc(&par, optarg)) {
fprintf(stderr, "%s: bad encoding\n", optarg);
exit(1);
}
break;
default:
usage();
exit(1);
break;
}
}
hdl = sio_open(NULL, SIO_PLAY, 0);
if (hdl == NULL) {
fprintf(stderr, "sio_open() failed\n");
exit(1);
}
if (!sio_setpar(hdl, &par)) {
fprintf(stderr, "sio_setpar() failed\n");
exit(1);
}
if (!sio_onvol(hdl, onvol, NULL))
fprintf(stderr, "warning: no volume knob on this device\n");
fprintf(stderr, "use ``+'' and ``-'' to adjust the volume\n");
if (!sio_start(hdl)) {
fprintf(stderr, "sio_start() failed\n");
exit(1);
}
for (;;) {
pfd[0].fd = tty;
pfd[0].events = POLLIN;
sio_pollfd(hdl, &pfd[1], POLLOUT);
if (poll(pfd, 2, INFTIM) < 0) {
perror("poll");
exit(1);
}
if (pfd[0].revents & POLLIN) {
if (read(tty, &cmd, 1) < 0) {
perror("read(tty)");
exit(1);
}
switch (cmd) {
case '+':
if (vol < SIO_MAXVOL) {
vol++;
sio_setvol(hdl, vol);
}
break;
case '-':
if (vol > 0) {
vol--;
sio_setvol(hdl, vol);
}
break;
}
}
if (sio_revents(hdl, &pfd[1]) & POLLOUT) {
len = read(STDIN_FILENO, buf, BUFSZ);
if (len < 0) {
perror("stdin");
exit(1);
}
if (len == 0)
break;
n = sio_write(hdl, buf, len);
if (n == 0) {
fprintf(stderr, "sio_write: failed\n");
exit(1);
}
}
}
sio_close(hdl);
return 0;
}
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