app.c

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * 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 Convenient Application Routines
 *
 * \author Mark Spencer <markster@digium.com> 
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <regex.h>

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/file.h"
#include "asterisk/app.h"
#include "asterisk/dsp.h"
#include "asterisk/logger.h"
#include "asterisk/options.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/indications.h"

#define MAX_OTHER_FORMATS 10


/* !
This function presents a dialtone and reads an extension into 'collect' 
which must be a pointer to a **pre-initialized** array of char having a 
size of 'size' suitable for writing to.  It will collect no more than the smaller 
of 'maxlen' or 'size' minus the original strlen() of collect digits.
\return 0 if extension does not exist, 1 if extension exists
*/
int ast_app_dtget(struct ast_channel *chan, const char *context, char *collect, size_t size, int maxlen, int timeout) 
{
	struct tone_zone_sound *ts;
	int res=0, x=0;

	if(maxlen > size)
		maxlen = size;
	
	if(!timeout && chan->pbx)
		timeout = chan->pbx->dtimeout;
	else if(!timeout)
		timeout = 5;
	
	ts = ast_get_indication_tone(chan->zone,"dial");
	if (ts && ts->data[0])
		res = ast_playtones_start(chan, 0, ts->data, 0);
	else 
		ast_log(LOG_NOTICE,"Huh....? no dial for indications?\n");
	
	for (x = strlen(collect); x < maxlen; ) {
		res = ast_waitfordigit(chan, timeout);
		if (!ast_ignore_pattern(context, collect))
			ast_playtones_stop(chan);
		if (res < 1)
			break;
		collect[x++] = res;
		if (!ast_matchmore_extension(chan, context, collect, 1, chan->cid.cid_num)) {
			if (collect[x-1] == '#') {
				/* Not a valid extension, ending in #, assume the # was to finish dialing */
				collect[x-1] = '\0';
			}
			break;
		}
	}
	if (res >= 0)
		res = ast_exists_extension(chan, context, collect, 1, chan->cid.cid_num) ? 1 : 0;
	return res;
}



/*! \param timeout set timeout to 0 for "standard" timeouts. Set timeout to -1 for 
   "ludicrous time" (essentially never times out) */
int ast_app_getdata(struct ast_channel *c, char *prompt, char *s, int maxlen, int timeout)
{
	int res,to,fto;
	/* XXX Merge with full version? XXX */
	if (maxlen)
		s[0] = '\0';
	if (prompt) {
		res = ast_streamfile(c, prompt, c->language);
		if (res < 0)
			return res;
	}
	fto = c->pbx ? c->pbx->rtimeout * 1000 : 6000;
	to = c->pbx ? c->pbx->dtimeout * 1000 : 2000;

	if (timeout > 0) 
		fto = to = timeout;
	if (timeout < 0) 
		fto = to = 1000000000;
	res = ast_readstring(c, s, maxlen, to, fto, "#");
	return res;
}


int ast_app_getdata_full(struct ast_channel *c, char *prompt, char *s, int maxlen, int timeout, int audiofd, int ctrlfd)
{
	int res,to,fto;
	if (prompt) {
		res = ast_streamfile(c, prompt, c->language);
		if (res < 0)
			return res;
	}
	fto = 6000;
	to = 2000;
	if (timeout > 0) 
		fto = to = timeout;
	if (timeout < 0) 
		fto = to = 1000000000;
	res = ast_readstring_full(c, s, maxlen, to, fto, "#", audiofd, ctrlfd);
	return res;
}

static int (*ast_has_voicemail_func)(const char *mailbox, const char *folder) = NULL;
static int (*ast_inboxcount_func)(const char *mailbox, int *newmsgs, int *oldmsgs) = NULL;
static int (*ast_messagecount_func)(const char *context, const char *mailbox, const char *folder) = NULL;

void ast_install_vm_functions(int (*has_voicemail_func)(const char *mailbox, const char *folder),
			      int (*inboxcount_func)(const char *mailbox, int *newmsgs, int *oldmsgs),
			      int (*messagecount_func)(const char *context, const char *mailbox, const char *folder))
{
	ast_has_voicemail_func = has_voicemail_func;
	ast_inboxcount_func = inboxcount_func;
	ast_messagecount_func = messagecount_func;
}

void ast_uninstall_vm_functions(void)
{
	ast_has_voicemail_func = NULL;
	ast_inboxcount_func = NULL;
	ast_messagecount_func = NULL;
}

int ast_app_has_voicemail(const char *mailbox, const char *folder)
{
	static int warned = 0;
	if (ast_has_voicemail_func)
		return ast_has_voicemail_func(mailbox, folder);

	if ((option_verbose > 2) && !warned) {
		ast_verbose(VERBOSE_PREFIX_3 "Message check requested for mailbox %s/folder %s but voicemail not loaded.\n", mailbox, folder ? folder : "INBOX");
		warned++;
	}
	return 0;
}


int ast_app_inboxcount(const char *mailbox, int *newmsgs, int *oldmsgs)
{
	static int warned = 0;
	if (newmsgs)
		*newmsgs = 0;
	if (oldmsgs)
		*oldmsgs = 0;
	if (ast_inboxcount_func)
		return ast_inboxcount_func(mailbox, newmsgs, oldmsgs);

	if (!warned && (option_verbose > 2)) {
		warned++;
		ast_verbose(VERBOSE_PREFIX_3 "Message count requested for mailbox %s but voicemail not loaded.\n", mailbox);
	}

	return 0;
}

int ast_app_messagecount(const char *context, const char *mailbox, const char *folder)
{
	static int warned = 0;
	if (ast_messagecount_func)
		return ast_messagecount_func(context, mailbox, folder);

	if (!warned && (option_verbose > 2)) {
		warned++;
		ast_verbose(VERBOSE_PREFIX_3 "Message count requested for mailbox %s@%s/%s but voicemail not loaded.\n", mailbox, context, folder);
	}

	return 0;
}

int ast_dtmf_stream(struct ast_channel *chan, struct ast_channel *peer, const char *digits, int between) 
{
	const char *ptr;
	int res = 0;
	struct ast_frame f = {
		.frametype = AST_FRAME_DTMF,
		.src = "ast_dtmf_stream"
	};

	if (!between)
		between = 100;

	if (peer)
		res = ast_autoservice_start(peer);

	if (!res)
		res = ast_waitfor(chan, 100);

	/* ast_waitfor will return the number of remaining ms on success */
	if (res < 0)
		return res;

	for (ptr = digits; *ptr; ptr++) {
		if (*ptr == 'w') {
			/* 'w' -- wait half a second */
			if ((res = ast_safe_sleep(chan, 500)))
				break;
		} else if (strchr("0123456789*#abcdfABCDF", *ptr)) {
			/* Character represents valid DTMF */
			if (*ptr == 'f' || *ptr == 'F') {
				/* ignore return values if not supported by channel */
				ast_indicate(chan, AST_CONTROL_FLASH);
			} else {
				f.subclass = *ptr;
				if ((res = ast_write(chan, &f)))
					break;
			}
			/* pause between digits */
			if ((res = ast_safe_sleep(chan, between)))
				break;
		} else
			ast_log(LOG_WARNING, "Illegal DTMF character '%c' in string. (0-9*#aAbBcCdD allowed)\n",*ptr);
	}

	if (peer) {
		/* Stop autoservice on the peer channel, but don't overwrite any error condition 
		   that has occurred previously while acting on the primary channel */
		if (ast_autoservice_stop(peer) && !res)
			res = -1;
	}

	return res;
}

struct linear_state {
	int fd;
	int autoclose;
	int allowoverride;
	int origwfmt;
};

static void linear_release(struct ast_channel *chan, void *params)
{
	struct linear_state *ls = params;
	if (ls->origwfmt && ast_set_write_format(chan, ls->origwfmt)) {
		ast_log(LOG_WARNING, "Unable to restore channel '%s' to format '%d'\n", chan->name, ls->origwfmt);
	}
	if (ls->autoclose)
		close(ls->fd);
	free(params);
}

static int linear_generator(struct ast_channel *chan, void *data, int len, int samples)
{
	struct ast_frame f;
	short buf[2048 + AST_FRIENDLY_OFFSET / 2];
	struct linear_state *ls = data;
	int res;
	len = samples * 2;
	if (len > sizeof(buf) - AST_FRIENDLY_OFFSET) {
		ast_log(LOG_WARNING, "Can't generate %d bytes of data!\n" ,len);
		len = sizeof(buf) - AST_FRIENDLY_OFFSET;
	}
	memset(&f, 0, sizeof(f));
	res = read(ls->fd, buf + AST_FRIENDLY_OFFSET/2, len);
	if (res > 0) {
		f.frametype = AST_FRAME_VOICE;
		f.subclass = AST_FORMAT_SLINEAR;
		f.data = buf + AST_FRIENDLY_OFFSET/2;
		f.datalen = res;
		f.samples = res / 2;
		f.offset = AST_FRIENDLY_OFFSET;
		ast_write(chan, &f);
		if (res == len)
			return 0;
	}
	return -1;
}

static void *linear_alloc(struct ast_channel *chan, void *params)
{
	struct linear_state *ls;
	/* In this case, params is already malloc'd */
	if (params) {
		ls = params;
		if (ls->allowoverride)
			ast_set_flag(chan, AST_FLAG_WRITE_INT);
		else
			ast_clear_flag(chan, AST_FLAG_WRITE_INT);
		ls->origwfmt = chan->writeformat;
		if (ast_set_write_format(chan, AST_FORMAT_SLINEAR)) {
			ast_log(LOG_WARNING, "Unable to set '%s' to linear format (write)\n", chan->name);
			free(ls);
			ls = params = NULL;
		}
	}
	return params;
}

static struct ast_generator linearstream = 
{
	alloc: linear_alloc,
	release: linear_release,
	generate: linear_generator,
};

int ast_linear_stream(struct ast_channel *chan, const char *filename, int fd, int allowoverride)
{
	struct linear_state *lin;
	char tmpf[256];
	int res = -1;
	int autoclose = 0;
	if (fd < 0) {
		if (ast_strlen_zero(filename))
			return -1;
		autoclose = 1;
		if (filename[0] == '/') 
			ast_copy_string(tmpf, filename, sizeof(tmpf));
		else
			snprintf(tmpf, sizeof(tmpf), "%s/%s/%s", (char *)ast_config_AST_DATA_DIR, "sounds", filename);
		fd = open(tmpf, O_RDONLY);
		if (fd < 0){
			ast_log(LOG_WARNING, "Unable to open file '%s': %s\n", tmpf, strerror(errno));
			return -1;
		}
	}
	if ((lin = ast_calloc(1, sizeof(*lin)))) {
		lin->fd = fd;
		lin->allowoverride = allowoverride;
		lin->autoclose = autoclose;
		res = ast_activate_generator(chan, &linearstream, lin);
	}
	return res;
}

int ast_control_streamfile(struct ast_channel *chan, const char *file,
			   const char *fwd, const char *rev,
			   const char *stop, const char *pause,
			   const char *restart, int skipms) 
{
	char *breaks = NULL;
	char *end = NULL;
	int blen = 2;
	int res;
	long pause_restart_point = 0;

	if (stop)
		blen += strlen(stop);
	if (pause)
		blen += strlen(pause);
	if (restart)
		blen += strlen(restart);

	if (blen > 2) {
		breaks = alloca(blen + 1);
		breaks[0] = '\0';
		if (stop)
			strcat(breaks, stop);
		if (pause)
			strcat(breaks, pause);
		if (restart)
			strcat(breaks, restart);
	}
	if (chan->_state != AST_STATE_UP)
		res = ast_answer(chan);

	if (file) {
		if ((end = strchr(file,':'))) {
			if (!strcasecmp(end, ":end")) {
				*end = '\0';
				end++;
			}
		}
	}

	for (;;) {
		ast_stopstream(chan);
		res = ast_streamfile(chan, file, chan->language);
		if (!res) {
			if (pause_restart_point) {
				ast_seekstream(chan->stream, pause_restart_point, SEEK_SET);
				pause_restart_point = 0;
			}
			else if (end) {
				ast_seekstream(chan->stream, 0, SEEK_END);
				end = NULL;
			};
			res = ast_waitstream_fr(chan, breaks, fwd, rev, skipms);
		}

		if (res < 1)
			break;

		/* We go at next loop if we got the restart char */
		if (restart && strchr(restart, res)) {
			ast_log(LOG_DEBUG, "we'll restart the stream here at next loop\n");
			pause_restart_point = 0;
			continue;
		}

		if (pause && strchr(pause, res)) {
			pause_restart_point = ast_tellstream(chan->stream);
			for (;;) {
				ast_stopstream(chan);
				res = ast_waitfordigit(chan, 1000);
				if (!res)
					continue;
				else if (res == -1 || strchr(pause, res) || (stop && strchr(stop, res)))
					break;
			}
			if (res == *pause) {
				res = 0;
				continue;
			}
		}

		if (res == -1)
			break;

		/* if we get one of our stop chars, return it to the calling function */
		if (stop && strchr(stop, res))
			break;
	}

	ast_stopstream(chan);

	return res;
}

int ast_play_and_wait(struct ast_channel *chan, const char *fn)
{
	int d;
	d = ast_streamfile(chan, fn, chan->language);
	if (d)
		return d;
	d = ast_waitstream(chan, AST_DIGIT_ANY);
	ast_stopstream(chan);
	return d;
}

static int global_silence_threshold = 128;
static int global_maxsilence = 0;

/*! Optionally play a sound file or a beep, then record audio and video from the channel.
 * @param chan Channel to playback to/record from.
 * @param playfile Filename of sound to play before recording begins.
 * @param recordfile Filename to record to.
 * @param maxtime Maximum length of recording (in milliseconds).
 * @param fmt Format(s) to record message in. Multiple formats may be specified by separating them with a '|'.
 * @param duration Where to store actual length of the recorded message (in milliseconds).
 * @param beep Whether to play a beep before starting to record.
 * @param silencethreshold 
 * @param maxsilence Length of silence that will end a recording (in milliseconds).
 * @param path Optional filesystem path to unlock.
 * @param prepend If true, prepend the recorded audio to an existing file.
 * @param acceptdtmf DTMF digits that will end the recording.
 * @param canceldtmf DTMF digits that will cancel the recording.
 */

static int __ast_play_and_record(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, int beep, int silencethreshold, int maxsilence, const char *path, int prepend, const char *acceptdtmf, const char *canceldtmf)
{
	int d = 0;
	char *fmts;
	char comment[256];
	int x, fmtcnt = 1, res = -1, outmsg = 0;
	struct ast_filestream *others[MAX_OTHER_FORMATS];
	char *sfmt[MAX_OTHER_FORMATS];
	char *stringp = NULL;
	time_t start, end;
	struct ast_dsp *sildet = NULL;   /* silence detector dsp */
	int totalsilence = 0;
	int rfmt = 0;
	struct ast_silence_generator *silgen = NULL;
	char prependfile[80];

	if (silencethreshold < 0)
		silencethreshold = global_silence_threshold;

	if (maxsilence < 0)
		maxsilence = global_maxsilence;

	/* barf if no pointer passed to store duration in */
	if (duration == NULL) {
		ast_log(LOG_WARNING, "Error play_and_record called without duration pointer\n");
		return -1;
	}

	ast_log(LOG_DEBUG,"play_and_record: %s, %s, '%s'\n", playfile ? playfile : "<None>", recordfile, fmt);
	snprintf(comment, sizeof(comment), "Playing %s, Recording to: %s on %s\n", playfile ? playfile : "<None>", recordfile, chan->name);

	if (playfile || beep) {
		if (!beep)
			d = ast_play_and_wait(chan, playfile);
		if (d > -1)
			d = ast_stream_and_wait(chan, "beep", chan->language, "");
		if (d < 0)
			return -1;
	}

	if (prepend) {
		ast_copy_string(prependfile, recordfile, sizeof(prependfile));	
		strncat(prependfile, "-prepend", sizeof(prependfile) - strlen(prependfile) - 1);
	}

	fmts = ast_strdupa(fmt);

	stringp = fmts;
	strsep(&stringp, "|");
	ast_log(LOG_DEBUG,"Recording Formats: sfmts=%s\n", fmts);
	sfmt[0] = ast_strdupa(fmts);

	while ((fmt = strsep(&stringp, "|"))) {
		if (fmtcnt > MAX_OTHER_FORMATS - 1) {
			ast_log(LOG_WARNING, "Please increase MAX_OTHER_FORMATS in app.c\n");
			break;
		}
		sfmt[fmtcnt++] = ast_strdupa(fmt);
	}

	end = start = time(NULL);  /* pre-initialize end to be same as start in case we never get into loop */
	for (x = 0; x < fmtcnt; x++) {
		others[x] = ast_writefile(prepend ? prependfile : recordfile, sfmt[x], comment, O_TRUNC, 0, 0700);
		if (option_verbose > 2)
			ast_verbose(VERBOSE_PREFIX_3 "x=%d, open writing:  %s format: %s, %p\n", x, prepend ? prependfile : recordfile, sfmt[x], others[x]);

		if (!others[x]) {
			break;
		}
	}

	if (path)
		ast_unlock_path(path);

	if (maxsilence > 0) {
		sildet = ast_dsp_new(); /* Create the silence detector */
		if (!sildet) {
			ast_log(LOG_WARNING, "Unable to create silence detector :(\n");
			return -1;
		}
		ast_dsp_set_threshold(sildet, silencethreshold);
		rfmt = chan->readformat;
		res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
		if (res < 0) {
			ast_log(LOG_WARNING, "Unable to set to linear mode, giving up\n");
			ast_dsp_free(sildet);
			return -1;
		}
	}

	if (!prepend) {
		/* Request a video update */
		ast_indicate(chan, AST_CONTROL_VIDUPDATE);

		if (ast_opt_transmit_silence)
			silgen = ast_channel_start_silence_generator(chan);
	}

	if (x == fmtcnt) {
		/* Loop forever, writing the packets we read to the writer(s), until
		   we read a digit or get a hangup */
		struct ast_frame *f;
		for (;;) {
		 	res = ast_waitfor(chan, 2000);
			if (!res) {
				ast_log(LOG_DEBUG, "One waitfor failed, trying another\n");
				/* Try one more time in case of masq */
			 	res = ast_waitfor(chan, 2000);
				if (!res) {
					ast_log(LOG_WARNING, "No audio available on %s??\n", chan->name);
					res = -1;
				}
			}

			if (res < 0) {
				f = NULL;
				break;
			}
			f = ast_read(chan);
			if (!f)
				break;
			if (f->frametype == AST_FRAME_VOICE) {
				/* write each format */
				for (x = 0; x < fmtcnt; x++) {
					if (prepend && !others[x])
						break;
					res = ast_writestream(others[x], f);
				}

				/* Silence Detection */
				if (maxsilence > 0) {
					int dspsilence = 0;
					ast_dsp_silence(sildet, f, &dspsilence);
					if (dspsilence)
						totalsilence = dspsilence;
					else
						totalsilence = 0;

					if (totalsilence > maxsilence) {
						/* Ended happily with silence */
						if (option_verbose > 2)
							ast_verbose( VERBOSE_PREFIX_3 "Recording automatically stopped after a silence of %d seconds\n", totalsilence/1000);
						res = 'S';
						outmsg = 2;
						break;
					}
				}
				/* Exit on any error */
				if (res) {
					ast_log(LOG_WARNING, "Error writing frame\n");
					break;
				}
			} else if (f->frametype == AST_FRAME_VIDEO) {
				/* Write only once */
				ast_writestream(others[0], f);
			} else if (f->frametype == AST_FRAME_DTMF) {
				if (prepend) {
				/* stop recording with any digit */
					if (option_verbose > 2) 
						ast_verbose(VERBOSE_PREFIX_3 "User ended message by pressing %c\n", f->subclass);
					res = 't';
					outmsg = 2;
					break;
				}
				if (strchr(acceptdtmf, f->subclass)) {
					if (option_verbose > 2)
						ast_verbose(VERBOSE_PREFIX_3 "User ended message by pressing %c\n", f->subclass);
					res = f->subclass;
					outmsg = 2;
					break;
				}
				if (strchr(canceldtmf, f->subclass)) {
					if (option_verbose > 2)
						ast_verbose(VERBOSE_PREFIX_3 "User cancelled message by pressing %c\n", f->subclass);
					res = f->subclass;
					outmsg = 0;
					break;
				}
			}
			if (maxtime) {
				end = time(NULL);
				if (maxtime < (end - start)) {
					if (option_verbose > 2)
						ast_verbose(VERBOSE_PREFIX_3 "Took too long, cutting it short...\n");
					res = 't';
					outmsg = 2;
					break;
				}
			}
			ast_frfree(f);
		}
		if (!f) {
			if (option_verbose > 2)
				ast_verbose(VERBOSE_PREFIX_3 "User hung up\n");
			res = -1;
			outmsg = 1;
		} else {
			ast_frfree(f);
		}
		if (end == start)
			end = time(NULL);
	} else {
		ast_log(LOG_WARNING, "Error creating writestream '%s', format '%s'\n", recordfile, sfmt[x]);
	}

	if (!prepend) {
		if (silgen)
			ast_channel_stop_silence_generator(chan, silgen);
	}
	*duration = end - start;

	if (!prepend) {
		for (x = 0; x < fmtcnt; x++) {
			if (!others[x])
				break;
			if (res > 0)
				ast_stream_rewind(others[x], totalsilence ? totalsilence-200 : 200);
			ast_truncstream(others[x]);
			ast_closestream(others[x]);
		}
	}

	if (prepend && outmsg) {
		struct ast_filestream *realfiles[MAX_OTHER_FORMATS];
		struct ast_frame *fr;

		for (x = 0; x < fmtcnt; x++) {
			snprintf(comment, sizeof(comment), "Opening the real file %s.%s\n", recordfile, sfmt[x]);
			realfiles[x] = ast_readfile(recordfile, sfmt[x], comment, O_RDONLY, 0, 0);
			if (!others[x] || !realfiles[x])
				break;
			ast_stream_rewind(others[x], totalsilence ? totalsilence-200 : 200);
			ast_truncstream(others[x]);
			/* add the original file too */
			while ((fr = ast_readframe(realfiles[x]))) {
				ast_writestream(others[x], fr);
				ast_frfree(fr);
			}
			ast_closestream(others[x]);
			ast_closestream(realfiles[x]);
			ast_filerename(prependfile, recordfile, sfmt[x]);
			if (option_verbose > 3)
				ast_verbose(VERBOSE_PREFIX_4 "Recording Format: sfmts=%s, prependfile %s, recordfile %s\n", sfmt[x], prependfile, recordfile);
			ast_filedelete(prependfile, sfmt[x]);
		}
	}
	if (rfmt && ast_set_read_format(chan, rfmt)) {
		ast_log(LOG_WARNING, "Unable to restore format %s to channel '%s'\n", ast_getformatname(rfmt), chan->name);
	}
	if (outmsg == 2) {
		ast_stream_and_wait(chan, "auth-thankyou", chan->language, "");
	}
	if (sildet)
		ast_dsp_free(sildet);
	return res;
}

static char default_acceptdtmf[] = "#";
static char default_canceldtmf[] = "";

int ast_play_and_record_full(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, int silencethreshold, int maxsilence, const char *path, const char *acceptdtmf, const char *canceldtmf)
{
	return __ast_play_and_record(chan, playfile, recordfile, maxtime, fmt, duration, 0, silencethreshold, maxsilence, path, 0, S_OR(acceptdtmf, default_acceptdtmf), S_OR(canceldtmf, default_canceldtmf));
}

int ast_play_and_record(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, int silencethreshold, int maxsilence, const char *path)
{
	return __ast_play_and_record(chan, playfile, recordfile, maxtime, fmt, duration, 0, silencethreshold, maxsilence, path, 0, default_acceptdtmf, default_canceldtmf);
}

int ast_play_and_prepend(struct ast_channel *chan, char *playfile, char *recordfile, int maxtime, char *fmt, int *duration, int beep, int silencethreshold, int maxsilence)
{
	return __ast_play_and_record(chan, playfile, recordfile, maxtime, fmt, duration, beep, silencethreshold, maxsilence, NULL, 1, default_acceptdtmf, default_canceldtmf);
}

/* Channel group core functions */

int ast_app_group_split_group(const char *data, char *group, int group_max, char *category, int category_max)
{
	int res=0;
	char tmp[256];
	char *grp=NULL, *cat=NULL;

	if (!ast_strlen_zero(data)) {
		ast_copy_string(tmp, data, sizeof(tmp));
		grp = tmp;
		cat = strchr(tmp, '@');
		if (cat) {
			*cat = '\0';
			cat++;
		}
	}

	if (!ast_strlen_zero(grp))
		ast_copy_string(group, grp, group_max);
	else
		res = -1;

	if (cat)
		snprintf(category, category_max, "%s_%s", GROUP_CATEGORY_PREFIX, cat);
	else
		ast_copy_string(category, GROUP_CATEGORY_PREFIX, category_max);

	return res;
}

int ast_app_group_set_channel(struct ast_channel *chan, const char *data)
{
	int res=0;
	char group[80] = "";
	char category[80] = "";

	if (!ast_app_group_split_group(data, group, sizeof(group), category, sizeof(category))) {
		pbx_builtin_setvar_helper(chan, category, group);
	} else
		res = -1;

	return res;
}

int ast_app_group_get_count(const char *group, const char *category)
{
	struct ast_channel *chan;
	int count = 0;
	const char *test;
	char cat[80];
	const char *s;

	if (ast_strlen_zero(group))
		return 0;

 	s = S_OR(category, GROUP_CATEGORY_PREFIX);
	ast_copy_string(cat, s, sizeof(cat));

	chan = NULL;
	while ((chan = ast_channel_walk_locked(chan)) != NULL) {
 		test = pbx_builtin_getvar_helper(chan, cat);
		if (test && !strcasecmp(test, group))
 			count++;
		ast_channel_unlock(chan);
	}

	return count;
}

int ast_app_group_match_get_count(const char *groupmatch, const char *category)
{
	regex_t regexbuf;
	struct ast_channel *chan;
	int count = 0;
	const char *test;
	char cat[80];
	const char *s;

	if (ast_strlen_zero(groupmatch))
		return 0;

	/* if regex compilation fails, return zero matches */
	if (regcomp(&regexbuf, groupmatch, REG_EXTENDED | REG_NOSUB))
		return 0;

	s = S_OR(category, GROUP_CATEGORY_PREFIX);
	ast_copy_string(cat, s, sizeof(cat));

	chan = NULL;
	while ((chan = ast_channel_walk_locked(chan)) != NULL) {
		test = pbx_builtin_getvar_helper(chan, cat);
		if (test && !regexec(&regexbuf, test, 0, NULL, 0))
			count++;
		ast_channel_unlock(chan);
	}

	regfree(&regexbuf);

	return count;
}

unsigned int ast_app_separate_args(char *buf, char delim, char **array, int arraylen)
{
	int argc;
	char *scan;
	int paren = 0, quote = 0;

	if (!buf || !array || !arraylen)
		return 0;

	memset(array, 0, arraylen * sizeof(*array));

	scan = buf;

	for (argc = 0; *scan && (argc < arraylen - 1); argc++) {
		array[argc] = scan;
		for (; *scan; scan++) {
			if (*scan == '(')
				paren++;
			else if (*scan == ')') {
				if (paren)
					paren--;
			} else if (*scan == '"') {
				quote = quote ? 0 : 1;
				/* Remove quote character from argument */
				memmove(scan, scan + 1, strlen(scan));
				scan--;
			} else if (*scan == '\\') {
				/* Literal character, don't parse */
				memmove(scan, scan + 1, strlen(scan));
			} else if ((*scan == delim) && !paren && !quote) {
				*scan++ = '\0';
				break;
			}
		}
	}

	if (*scan)
		array[argc++] = scan;

	return argc;
}

enum AST_LOCK_RESULT ast_lock_path(const char *path)
{
	char *s;
	char *fs;
	int res;
	int fd;
	int lp = strlen(path);
	time_t start;

	if (!(s = alloca(lp + 10)) || !(fs = alloca(lp + 20))) {
		ast_log(LOG_WARNING, "Out of memory!\n");
		return AST_LOCK_FAILURE;
	}

	snprintf(fs, strlen(path) + 19, "%s/.lock-%08lx", path, ast_random());
	fd = open(fs, O_WRONLY | O_CREAT | O_EXCL, 0600);
	if (fd < 0) {
		fprintf(stderr, "Unable to create lock file '%s': %s\n", path, strerror(errno));
		return AST_LOCK_PATH_NOT_FOUND;
	}
	close(fd);

	snprintf(s, strlen(path) + 9, "%s/.lock", path);
	start = time(NULL);
	while (((res = link(fs, s)) < 0) && (errno == EEXIST) && (time(NULL) - start < 5))
		usleep(1);
	if (res) {
		ast_log(LOG_WARNING, "Failed to lock path '%s': %s\n", path, strerror(errno));
		return AST_LOCK_TIMEOUT;
	} else {
		unlink(fs);
		ast_log(LOG_DEBUG, "Locked path '%s'\n", path);
		return AST_LOCK_SUCCESS;
	}
}

int ast_unlock_path(const char *path)
{
	char *s;
	if (!(s = alloca(strlen(path) + 10)))
		return -1;
	snprintf(s, strlen(path) + 9, "%s/%s", path, ".lock");
	ast_log(LOG_DEBUG, "Unlocked path '%s'\n", path);
	return unlink(s);
}

int ast_record_review(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, const char *path) 
{
	int silencethreshold = 128; 
	int maxsilence=0;
	int res = 0;
	int cmd = 0;
	int max_attempts = 3;
	int attempts = 0;
	int recorded = 0;
	int message_exists = 0;
	/* Note that urgent and private are for flagging messages as such in the future */

	/* barf if no pointer passed to store duration in */
	if (duration == NULL) {
		ast_log(LOG_WARNING, "Error ast_record_review called without duration pointer\n");
		return -1;
	}

	cmd = '3';	 /* Want to start by recording */

	while ((cmd >= 0) && (cmd != 't')) {
		switch (cmd) {
		case '1':
			if (!message_exists) {
				/* In this case, 1 is to record a message */
				cmd = '3';
				break;
			} else {
				ast_stream_and_wait(chan, "vm-msgsaved", chan->language, "");
				cmd = 't';
				return res;
			}
		case '2':
			/* Review */
			ast_verbose(VERBOSE_PREFIX_3 "Reviewing the recording\n");
			cmd = ast_stream_and_wait(chan, recordfile, chan->language, AST_DIGIT_ANY);
			break;
		case '3':
			message_exists = 0;
			/* Record */
			if (recorded == 1)
				ast_verbose(VERBOSE_PREFIX_3 "Re-recording\n");
			else	
				ast_verbose(VERBOSE_PREFIX_3 "Recording\n");