Attachment 114732 Details for Bug 156433 – test_vol.c

test_vol.c

test_vol.c (text/plain), 1.61 KB, created by Test Rat on 2011-07-29 01:25:37 UTC

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Creator: Test Rat

Created: 2011-07-29 01:25:37 UTC

Size: 1.61 KB

patch

obsolete

>#include <sys/ioctl.h>
>#include <sys/soundcard.h>
>#include <err.h>
>#include <errno.h>
>#include <fcntl.h>
>#include <stdio.h>
>#include <termios.h>
>#include <unistd.h>
>
>int audio_fd;
>int lvol, rvol;
>
>void
>setplayvol(void)
>{
>	int mask = lvol | rvol << 8;
>	if(ioctl(audio_fd, SNDCTL_DSP_SETPLAYVOL, &mask) < 0)
>		err(errno, "SNDCTL_DSP_SETPLAYVOL failed");
>}
>
>void
>getplayvol(void)
>{
>	int mask;
>	if(ioctl(audio_fd, SNDCTL_DSP_GETPLAYVOL, &mask) < 0)
>		err(errno, "SNDCTL_DSP_GETPLAYVOL failed");
>	lvol = mask & 0x00ff;
>	rvol = (mask & 0xff00) >> 8;
>	printf("\rvol is %d:%d  ", lvol, rvol);
>}
>
>int
>main(void)
>{
>	char ch, buf[] = "noise";
>	struct termios t;
>
>	if((audio_fd = open("/dev/dsp", O_WRONLY, 0)) < 0)
>		err(errno, "open failed");
>
>	printf("hit ^C to abort\n");
>	getplayvol();
>
>	tcgetattr(0, &t);
>	t.c_lflag &= ~(ECHO|ICANON);
>	tcsetattr(0, TCSANOW, &t);
>
>	while ((ch = getchar()) != EOF) {
>		switch(ch) {
>		case '+':
>			if(lvol < 100 && rvol < 100) {
>				lvol++;
>				rvol++;
>			}
>			break;
>		case '-':
>			if(lvol > 0 && rvol > 0) {
>				lvol--;
>				rvol--;
>			}
>			break;
>		case 'L':
>		case 'l':
>			if(lvol < 100)
>				lvol++;
>			break;
>		case 'R':
>		case 'r':
>			if(rvol < 100)
>				rvol++;
>			break;
>		case '\014': /* ^L */
>			if(lvol > 0)
>				lvol--;
>			break;
>		case '\022': /* ^R */
>			if(rvol > 0)
>				rvol--;
>			break;
>		case '\007': /* ^G */
>			close(audio_fd);
>			if((audio_fd = open("/dev/dsp", O_WRONLY, 0)) < 0)
>				err(errno, "open failed");
>			getplayvol();
>			continue;
>		default: /* any other key produces noise */
>			write(audio_fd, buf, sizeof(buf));
>			continue;
>		}
>		setplayvol();
>		getplayvol();
>	}
>
>	close(audio_fd);
>	return 0;
>}

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Attachments on bug 156433: 114731 | 114732