chan_phone.c

Asterisk中信道部分的源码 。。。。

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <[e-mail]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Generic Linux Telephony Interface driver
 *
 * \author Mark Spencer <[e-mail]>
 * 
 * \ingroup channel_drivers
 */

/*** MODULEINFO
	<depend>ixjuser</depend>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 106235 $")

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <signal.h>
#ifdef HAVE_LINUX_COMPILER_H
#include <linux/compiler.h>
#endif
#include <linux/telephony.h>
/* Still use some IXJ specific stuff */
#include <linux/version.h>
#include <linux/ixjuser.h>

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/utils.h"
#include "asterisk/callerid.h"
#include "asterisk/causes.h"
#include "asterisk/stringfields.h"
#include "asterisk/musiconhold.h"

#include "DialTone.h"

#ifdef QTI_PHONEJACK_TJ_PCI	/* check for the newer quicknet driver v.3.1.0 which has this symbol */
#define QNDRV_VER 310
#else
#define QNDRV_VER 100
#endif

#if QNDRV_VER > 100
#ifdef __linux__
#define IXJ_PHONE_RING_START(x)	ioctl(p->fd, PHONE_RING_START, &x);
#else /* FreeBSD and others */
#define IXJ_PHONE_RING_START(x)	ioctl(p->fd, PHONE_RING_START, x);
#endif /* __linux__ */
#else	/* older driver */
#define IXJ_PHONE_RING_START(x)	ioctl(p->fd, PHONE_RING_START, &x);
#endif

#define DEFAULT_CALLER_ID "Unknown"
#define PHONE_MAX_BUF 480
#define DEFAULT_GAIN 0x100

static const char tdesc[] = "Standard Linux Telephony API Driver";
static const char config[] = "phone.conf";

/* Default context for dialtone mode */
static char context[AST_MAX_EXTENSION] = "default";

/* Default language */
static char language[MAX_LANGUAGE] = "";

static int echocancel = AEC_OFF;

static int silencesupression = 0;

static int prefformat = AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW;

/* Protect the interface list (of phone_pvt's) */
AST_MUTEX_DEFINE_STATIC(iflock);

/* Protect the monitoring thread, so only one process can kill or start it, and not
   when it's doing something critical. */
AST_MUTEX_DEFINE_STATIC(monlock);

/* Boolean value whether the monitoring thread shall continue. */
static unsigned int monitor;
   
/* This is the thread for the monitor which checks for input on the channels
   which are not currently in use.  */
static pthread_t monitor_thread = AST_PTHREADT_NULL;

static int restart_monitor(void);

/* The private structures of the Phone Jack channels are linked for
   selecting outgoing channels */
   
#define MODE_DIALTONE 	1
#define MODE_IMMEDIATE	2
#define MODE_FXO	3
#define MODE_FXS        4
#define MODE_SIGMA      5

static struct phone_pvt {
	int fd;							/* Raw file descriptor for this device */
	struct ast_channel *owner;		/* Channel we belong to, possibly NULL */
	int mode;						/* Is this in the  */
	int lastformat;					/* Last output format */
	int lastinput;					/* Last input format */
	int ministate;					/* Miniature state, for dialtone mode */
	char dev[256];					/* Device name */
	struct phone_pvt *next;			/* Next channel in list */
	struct ast_frame fr;			/* Frame */
	char offset[AST_FRIENDLY_OFFSET];
	char buf[PHONE_MAX_BUF];					/* Static buffer for reading frames */
	int obuflen;
	int dialtone;
	int txgain, rxgain;             /* gain control for playing, recording  */
									/* 0x100 - 1.0, 0x200 - 2.0, 0x80 - 0.5 */
	int cpt;						/* Call Progress Tone playing? */
	int silencesupression;
	char context[AST_MAX_EXTENSION];
	char obuf[PHONE_MAX_BUF * 2];
	char ext[AST_MAX_EXTENSION];
	char language[MAX_LANGUAGE];
	char cid_num[AST_MAX_EXTENSION];
	char cid_name[AST_MAX_EXTENSION];
} *iflist = NULL;

static char cid_num[AST_MAX_EXTENSION];
static char cid_name[AST_MAX_EXTENSION];

static struct ast_channel *phone_request(const char *type, int format, void *data, int *cause);
static int phone_digit_begin(struct ast_channel *ast, char digit);
static int phone_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
static int phone_call(struct ast_channel *ast, char *dest, int timeout);
static int phone_hangup(struct ast_channel *ast);
static int phone_answer(struct ast_channel *ast);
static struct ast_frame *phone_read(struct ast_channel *ast);
static int phone_write(struct ast_channel *ast, struct ast_frame *frame);
static struct ast_frame *phone_exception(struct ast_channel *ast);
static int phone_send_text(struct ast_channel *ast, const char *text);
static int phone_fixup(struct ast_channel *old, struct ast_channel *new);
static int phone_indicate(struct ast_channel *chan, int condition, const void *data, size_t datalen);

static const struct ast_channel_tech phone_tech = {
	.type = "Phone",
	.description = tdesc,
	.capabilities = AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR | AST_FORMAT_ULAW,
	.requester = phone_request,
	.send_digit_begin = phone_digit_begin,
	.send_digit_end = phone_digit_end,
	.call = phone_call,
	.hangup = phone_hangup,
	.answer = phone_answer,
	.read = phone_read,
	.write = phone_write,
	.exception = phone_exception,
	.indicate = phone_indicate,
	.fixup = phone_fixup
};

static struct ast_channel_tech phone_tech_fxs = {
	.type = "Phone",
	.description = tdesc,
	.requester = phone_request,
	.send_digit_begin = phone_digit_begin,
	.send_digit_end = phone_digit_end,
	.call = phone_call,
	.hangup = phone_hangup,
	.answer = phone_answer,
	.read = phone_read,
	.write = phone_write,
	.exception = phone_exception,
	.write_video = phone_write,
	.send_text = phone_send_text,
	.indicate = phone_indicate,
	.fixup = phone_fixup
};

static struct ast_channel_tech *cur_tech;

static int phone_indicate(struct ast_channel *chan, int condition, const void *data, size_t datalen)
{
	struct phone_pvt *p = chan->tech_pvt;
	int res=-1;
	ast_log(LOG_DEBUG, "Requested indication %d on channel %s\n", condition, chan->name);
	switch(condition) {
	case AST_CONTROL_FLASH:
		ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_ON_HOOK);
		usleep(320000);
		ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_OFF_HOOK);
			p->lastformat = -1;
			res = 0;
			break;
	case AST_CONTROL_HOLD:
		ast_moh_start(chan, data, NULL);
		break;
	case AST_CONTROL_UNHOLD:
		ast_moh_stop(chan);
		break;
	case AST_CONTROL_SRCUPDATE:
		res = 0;
		break;
	default:
		ast_log(LOG_WARNING, "Condition %d is not supported on channel %s\n", condition, chan->name);
	}
	return res;
}

static int phone_fixup(struct ast_channel *old, struct ast_channel *new)
{
	struct phone_pvt *pvt = old->tech_pvt;
	if (pvt && pvt->owner == old)
		pvt->owner = new;
	return 0;
}

static int phone_digit_begin(struct ast_channel *chan, char digit)
{
	/* XXX Modify this callback to let Asterisk support controlling the length of DTMF */
	return 0;
}

static int phone_digit_end(struct ast_channel *ast, char digit, unsigned int duration)
{
	struct phone_pvt *p;
	int outdigit;
	p = ast->tech_pvt;
	ast_log(LOG_DEBUG, "Dialed %c\n", digit);
	switch(digit) {
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
		outdigit = digit - '0';
		break;
	case '*':
		outdigit = 11;
		break;
	case '#':
		outdigit = 12;
		break;
	case 'f':	/*flash*/
	case 'F':
		ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_ON_HOOK);
		usleep(320000);
		ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_OFF_HOOK);
		p->lastformat = -1;
		return 0;
	default:
		ast_log(LOG_WARNING, "Unknown digit '%c'\n", digit);
		return -1;
	}
	ast_log(LOG_DEBUG, "Dialed %d\n", outdigit);
	ioctl(p->fd, PHONE_PLAY_TONE, outdigit);
	p->lastformat = -1;
	return 0;
}

static int phone_call(struct ast_channel *ast, char *dest, int timeout)
{
	struct phone_pvt *p;

	PHONE_CID cid;
	time_t UtcTime;
	struct tm tm;
	int start;

	time(&UtcTime);
	ast_localtime(&UtcTime, &tm, NULL);

	memset(&cid, 0, sizeof(PHONE_CID));
	if(&tm != NULL) {
		snprintf(cid.month, sizeof(cid.month), "%02d",(tm.tm_mon + 1));
		snprintf(cid.day, sizeof(cid.day),     "%02d", tm.tm_mday);
		snprintf(cid.hour, sizeof(cid.hour),   "%02d", tm.tm_hour);
		snprintf(cid.min, sizeof(cid.min),     "%02d", tm.tm_min);
	}
	/* the standard format of ast->callerid is:  "name" <number>, but not always complete */
	if (ast_strlen_zero(ast->cid.cid_name))
		strcpy(cid.name, DEFAULT_CALLER_ID);
	else
		ast_copy_string(cid.name, ast->cid.cid_name, sizeof(cid.name));

	if (ast->cid.cid_num) 
		ast_copy_string(cid.number, ast->cid.cid_num, sizeof(cid.number));

	p = ast->tech_pvt;

	if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
		ast_log(LOG_WARNING, "phone_call called on %s, neither down nor reserved\n", ast->name);
		return -1;
	}
	if (option_debug)
		ast_log(LOG_DEBUG, "Ringing %s on %s (%d)\n", dest, ast->name, ast->fds[0]);

	start = IXJ_PHONE_RING_START(cid);
	if (start == -1)
		return -1;
	
	if (p->mode == MODE_FXS) {
		char *digit = strchr(dest, '/');
		if (digit)
		{
		  digit++;
		  while (*digit)
		    phone_digit_end(ast, *digit++, 0);
		}
	}
 
  	ast_setstate(ast, AST_STATE_RINGING);
	ast_queue_control(ast, AST_CONTROL_RINGING);
	return 0;
}

static int phone_hangup(struct ast_channel *ast)
{
	struct phone_pvt *p;
	p = ast->tech_pvt;
	if (option_debug)
		ast_log(LOG_DEBUG, "phone_hangup(%s)\n", ast->name);
	if (!ast->tech_pvt) {
		ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
		return 0;
	}
	/* XXX Is there anything we can do to really hang up except stop recording? */
	ast_setstate(ast, AST_STATE_DOWN);
	if (ioctl(p->fd, PHONE_REC_STOP))
		ast_log(LOG_WARNING, "Failed to stop recording\n");
	if (ioctl(p->fd, PHONE_PLAY_STOP))
		ast_log(LOG_WARNING, "Failed to stop playing\n");
	if (ioctl(p->fd, PHONE_RING_STOP))
		ast_log(LOG_WARNING, "Failed to stop ringing\n");
	if (ioctl(p->fd, PHONE_CPT_STOP))
		ast_log(LOG_WARNING, "Failed to stop sounds\n");

	/* If it's an FXO, hang them up */
	if (p->mode == MODE_FXO) {
		if (ioctl(p->fd, PHONE_PSTN_SET_STATE, PSTN_ON_HOOK)) 
			ast_log(LOG_DEBUG, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n",ast->name, strerror(errno));
	}

	/* If they're off hook, give a busy signal */
	if (ioctl(p->fd, PHONE_HOOKSTATE)) {
		if (option_debug)
			ast_log(LOG_DEBUG, "Got hunghup, giving busy signal\n");
		ioctl(p->fd, PHONE_BUSY);
		p->cpt = 1;
	}
	p->lastformat = -1;
	p->lastinput = -1;
	p->ministate = 0;
	p->obuflen = 0;
	p->dialtone = 0;
	memset(p->ext, 0, sizeof(p->ext));
	((struct phone_pvt *)(ast->tech_pvt))->owner = NULL;
	ast_module_unref(ast_module_info->self);
	if (option_verbose > 2) 
		ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
	ast->tech_pvt = NULL;
	ast_setstate(ast, AST_STATE_DOWN);
	restart_monitor();
	return 0;
}

static int phone_setup(struct ast_channel *ast)
{
	struct phone_pvt *p;
	p = ast->tech_pvt;
	ioctl(p->fd, PHONE_CPT_STOP);
	/* Nothing to answering really, just start recording */
	if (ast->rawreadformat == AST_FORMAT_G723_1) {
		/* Prefer g723 */
		ioctl(p->fd, PHONE_REC_STOP);
		if (p->lastinput != AST_FORMAT_G723_1) {
			p->lastinput = AST_FORMAT_G723_1;
			if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
				ast_log(LOG_WARNING, "Failed to set codec to g723.1\n");
				return -1;
			}
		}
	} else if (ast->rawreadformat == AST_FORMAT_SLINEAR) {
		ioctl(p->fd, PHONE_REC_STOP);
		if (p->lastinput != AST_FORMAT_SLINEAR) {
			p->lastinput = AST_FORMAT_SLINEAR;
			if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
				ast_log(LOG_WARNING, "Failed to set codec to signed linear 16\n");
				return -1;
			}
		}
	} else if (ast->rawreadformat == AST_FORMAT_ULAW) {
		ioctl(p->fd, PHONE_REC_STOP);
		if (p->lastinput != AST_FORMAT_ULAW) {
			p->lastinput = AST_FORMAT_ULAW;
			if (ioctl(p->fd, PHONE_REC_CODEC, ULAW)) {
				ast_log(LOG_WARNING, "Failed to set codec to uLaw\n");
				return -1;
			}
		}
	} else if (p->mode == MODE_FXS) {
		ioctl(p->fd, PHONE_REC_STOP);
		if (p->lastinput != ast->rawreadformat) {
			p->lastinput = ast->rawreadformat;
			if (ioctl(p->fd, PHONE_REC_CODEC, ast->rawreadformat)) {
				ast_log(LOG_WARNING, "Failed to set codec to %d\n", 
					ast->rawreadformat);
				return -1;
			}
		}
	} else {
		ast_log(LOG_WARNING, "Can't do format %s\n", ast_getformatname(ast->rawreadformat));
		return -1;
	}
	if (ioctl(p->fd, PHONE_REC_START)) {
		ast_log(LOG_WARNING, "Failed to start recording\n");
		return -1;
	}
	/* set the DTMF times (the default is too short) */
	ioctl(p->fd, PHONE_SET_TONE_ON_TIME, 300);
	ioctl(p->fd, PHONE_SET_TONE_OFF_TIME, 200);
	return 0;
}

static int phone_answer(struct ast_channel *ast)
{
	struct phone_pvt *p;
	p = ast->tech_pvt;
	/* In case it's a LineJack, take it off hook */
	if (p->mode == MODE_FXO) {
		if (ioctl(p->fd, PHONE_PSTN_SET_STATE, PSTN_OFF_HOOK)) 
			ast_log(LOG_DEBUG, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n", ast->name, strerror(errno));
		else
			ast_log(LOG_DEBUG, "Took linejack off hook\n");
	}
	phone_setup(ast);
	if (option_debug)
		ast_log(LOG_DEBUG, "phone_answer(%s)\n", ast->name);
	ast->rings = 0;
	ast_setstate(ast, AST_STATE_UP);
	return 0;
}

#if 0
static char phone_2digit(char c)