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/*
* Monitor a Zaptel Channel
*
* Written by Mark Spencer <markster@linux-support.net>
* Based on previous works, designs, and architectures conceived and
* written by Jim Dixon <jim@lambdatel.com>.
*
* Copyright (C) 2001 Jim Dixon / Zapata Telephony.
* Copyright (C) 2001 Linux Support Services, Inc.
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under thet erms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Primary Author: Mark Spencer <markster@linux-support.net>
*
*/
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#ifdef STANDALONE_ZAPATA
#include "zaptel.h"
#include "tonezone.h"
#else
#include <linux/zaptel.h>
#include <tonezone.h>
#endif
#include <linux/soundcard.h>
#define BUFFERS 4
#define FRAG_SIZE 8
int audio_open(void)
{
int fd;
int speed = 8000;
int fmt = AFMT_S16_LE;
int stereo = 0;
int fragsize = (BUFFERS << 16) | (FRAG_SIZE);
struct audio_buf_info ispace, ospace;
fd = open("/dev/dsp", O_WRONLY);
if (fd < 0) {
fprintf(stderr, "Unable to open /dev/dsp: %s\n", strerror(errno));
return -1;
}
/* Step 1: Signed linear */
if (ioctl(fd, SNDCTL_DSP_SETFMT, &fmt) < 0) {
fprintf(stderr, "ioctl(SETFMT) failed: %s\n", strerror(errno));
close(fd);
return -1;
}
/* Step 2: Make non-stereo */
if (ioctl(fd, SNDCTL_DSP_STEREO, &stereo) < 0) {
fprintf(stderr, "ioctl(STEREO) failed: %s\n", strerror(errno));
close(fd);
return -1;
}
/* Step 3: Make 8000 Hz */
if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) < 0) {
fprintf(stderr, "ioctl(SPEED) failed: %s\n", strerror(errno));
close(fd);
return -1;
}
if (speed != 8000)
fprintf(stderr, "Warning: Requested 8000 Hz, got %d\n", speed);
if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &fragsize)) {
fprintf(stderr, "Sound card won't let me set fragment size to 10 64-byte buffers (%x)\n"
"so sound may be choppy: %s.\n", fragsize, strerror(errno));
}
bzero(&ispace, sizeof(ispace));
bzero(&ospace, sizeof(ospace));
if (ioctl(fd, SNDCTL_DSP_GETISPACE, &ispace)) {
/* They don't support block size stuff, so just return but notify the user */
fprintf(stderr, "Sound card won't let me know the input buffering...\n");
}
if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &ospace)) {
/* They don't support block size stuff, so just return but notify the user */
fprintf(stderr, "Sound card won't let me know the output buffering...\n");
}
fprintf(stderr, "New input space: %d of %d %d byte fragments (%d bytes left)\n",
ispace.fragments, ispace.fragstotal, ispace.fragsize, ispace.bytes);
fprintf(stderr, "New output space: %d of %d %d byte fragments (%d bytes left)\n",
ospace.fragments, ospace.fragstotal, ospace.fragsize, ospace.bytes);
return fd;
}
int pseudo_open(void)
{
int fd;
int x = 1;
fd = open("/dev/zap/pseudo", O_RDWR);
if (fd < 0) {
fprintf(stderr, "Unable to open pseudo channel: %s\n", strerror(errno));
return -1;
}
if (ioctl(fd, ZT_SETLINEAR, &x)) {
fprintf(stderr, "Unable to set linear mode: %s\n", strerror(errno));
close(fd);
return -1;
}
x = 240;
if (ioctl(fd, ZT_SET_BLOCKSIZE, &x)) {
fprintf(stderr, "unable to set sane block size: %s\n", strerror(errno));
close(fd);
return -1;
}
return fd;
}
int main(int argc, char *argv[])
{
int afd, pfd;
char buf[8192];
int res;
struct zt_confinfo zc;
if ((argc < 2) || (atoi(argv[1]) < 1)) {
fprintf(stderr, "Usage: ztmonitor <channel num>\n");
exit(1);
}
/* Open audio */
if ((afd = audio_open()) < 0)
exit(1);
/* Open Pseudo device */
if ((pfd = pseudo_open()) < 0)
exit(1);
/* Conference them */
memset(&zc, 0, sizeof(zc));
zc.chan = 0;
zc.confno = atoi(argv[1]);
zc.confmode = ZT_CONF_MONITORBOTH;
if (ioctl(pfd, ZT_SETCONF, &zc) < 0) {
fprintf(stderr, "Unable to monitor: %s\n", strerror(errno));
exit(1);
}
/* Now, copy from pseudo to audio */
for (;;) {
res = read(pfd, buf, sizeof(buf));
if (res < 1)
break;
write(afd, buf, res);
}
exit(0);
}
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