app.c

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/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Convenient Application Routines
 * 
 * Copyright (C) 1999-2004, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

#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 <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.h"
#include "astconf.h"

#define MAX_OTHER_FORMATS 10

/* 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;
}

int ast_app_getvoice(struct ast_channel *c, char *dest, char *dstfmt, char *prompt, int silence, int maxsec)
{
   int res;
   struct ast_filestream *writer;
   int rfmt;
   int totalms=0, total;
   
   struct ast_frame *f;
   struct ast_dsp *sildet;
   /* Play prompt if requested */
   if (prompt) {
      res = ast_streamfile(c, prompt, c->language);
      if (res < 0)
         return res;
      res = ast_waitstream(c,"");
      if (res < 0)
         return res;
   }
   rfmt = c->readformat;
   res = ast_set_read_format(c, AST_FORMAT_SLINEAR);
   if (res < 0) {
      ast_log(LOG_WARNING, "Unable to set to linear mode, giving up\n");
      return -1;
   }
   sildet = ast_dsp_new();
   if (!sildet) {
      ast_log(LOG_WARNING, "Unable to create silence detector :(\n");
      return -1;
   }
   writer = ast_writefile(dest, dstfmt, "Voice file", 0, 0, 0666);
   if (!writer) {
      ast_log(LOG_WARNING, "Unable to open file '%s' in format '%s' for writing\n", dest, dstfmt);
      ast_dsp_free(sildet);
      return -1;
   }
   for(;;) {
      if ((res = ast_waitfor(c, 2000)) < 0) {
         ast_log(LOG_NOTICE, "Waitfor failed while recording file '%s' format '%s'\n", dest, dstfmt);
         break;
      }
      if (res) {
         f = ast_read(c);
         if (!f) {
            ast_log(LOG_NOTICE, "Hungup while recording file '%s' format '%s'\n", dest, dstfmt);
            break;
         }
         if ((f->frametype == AST_FRAME_DTMF) && (f->subclass == '#')) {
            /* Ended happily with DTMF */
            ast_frfree(f);
            break;
         } else if (f->frametype == AST_FRAME_VOICE) {
            ast_dsp_silence(sildet, f, &total); 
            if (total > silence) {
               /* Ended happily with silence */
               ast_frfree(f);
               break;
            }
            totalms += f->samples / 8;
            if (totalms > maxsec * 1000) {
               /* Ended happily with too much stuff */
               ast_log(LOG_NOTICE, "Constraining voice on '%s' to %d seconds\n", c->name, maxsec);
               ast_frfree(f);
               break;
            }
         }
         ast_frfree(f);
      }
   }
   res = ast_set_read_format(c, rfmt);
   if (res)
      ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", c->name);
   ast_dsp_free(sildet);
   ast_closestream(writer);
   return 0;
}

int ast_app_has_voicemail(const char *mailbox)
{
   DIR *dir;
   struct dirent *de;
   char fn[256];
   char tmp[256]="";
   char *mb, *cur;
   char *context;
   int ret;
   /* If no mailbox, return immediately */
   if (ast_strlen_zero(mailbox))
      return 0;
   if (strchr(mailbox, ',')) {
      strncpy(tmp, mailbox, sizeof(tmp) - 1);
      mb = tmp;
      ret = 0;
      while((cur = strsep(&mb, ","))) {
         if (!ast_strlen_zero(cur)) {
            if (ast_app_has_voicemail(cur))
               return 1; 
         }
      }
      return 0;
   }
   strncpy(tmp, mailbox, sizeof(tmp) - 1);
   context = strchr(tmp, '@');
   if (context) {
      *context = '\0';
      context++;
   } else
      context = "default";
   snprintf(fn, sizeof(fn), "%s/voicemail/%s/%s/INBOX", (char *)ast_config_AST_SPOOL_DIR, context, tmp);
   dir = opendir(fn);
   if (!dir)
      return 0;
   while ((de = readdir(dir))) {
      if (!strncasecmp(de->d_name, "msg", 3))
         break;
   }
   closedir(dir);
   if (de)
      return 1;
   return 0;
}

int ast_app_messagecount(const char *mailbox, int *newmsgs, int *oldmsgs)
{
   DIR *dir;
   struct dirent *de;
   char fn[256];
   char tmp[256]="";
   char *mb, *cur;
   char *context;
   int ret;
   if (newmsgs)
      *newmsgs = 0;
   if (oldmsgs)
      *oldmsgs = 0;
   /* If no mailbox, return immediately */
   if (ast_strlen_zero(mailbox))
      return 0;
   if (strchr(mailbox, ',')) {
      int tmpnew, tmpold;
      strncpy(tmp, mailbox, sizeof(tmp) - 1);
      mb = tmp;
      ret = 0;
      while((cur = strsep(&mb, ", "))) {
         if (!ast_strlen_zero(cur)) {
            if (ast_app_messagecount(cur, newmsgs ? &tmpnew : NULL, oldmsgs ? &tmpold : NULL))
               return -1;
            else {
               if (newmsgs)
                  *newmsgs += tmpnew; 
               if (oldmsgs)
                  *oldmsgs += tmpold;
            }
         }
      }
      return 0;
   }
   strncpy(tmp, mailbox, sizeof(tmp) - 1);
   context = strchr(tmp, '@');
   if (context) {
      *context = '\0';
      context++;
   } else
      context = "default";
   if (newmsgs) {
      snprintf(fn, sizeof(fn), "%s/voicemail/%s/%s/INBOX", (char *)ast_config_AST_SPOOL_DIR, context, tmp);
      dir = opendir(fn);
      if (dir) {
         while ((de = readdir(dir))) {
            if ((strlen(de->d_name) > 3) && !strncasecmp(de->d_name, "msg", 3) &&
               !strcasecmp(de->d_name + strlen(de->d_name) - 3, "txt"))
                  (*newmsgs)++;
               
         }
         closedir(dir);
      }
   }
   if (oldmsgs) {
      snprintf(fn, sizeof(fn), "%s/voicemail/%s/%s/Old", (char *)ast_config_AST_SPOOL_DIR, context, tmp);
      dir = opendir(fn);
      if (dir) {
         while ((de = readdir(dir))) {
            if ((strlen(de->d_name) > 3) && !strncasecmp(de->d_name, "msg", 3) &&
               !strcasecmp(de->d_name + strlen(de->d_name) - 3, "txt"))
                  (*oldmsgs)++;
               
         }
         closedir(dir);
      }
   }
   return 0;
}

int ast_dtmf_stream(struct ast_channel *chan,struct ast_channel *peer,char *digits,int between) 
{
   char *ptr=NULL;
   int res=0;
   struct ast_frame f;
   if (!between)
      between = 100;

   if (peer)
      res = ast_autoservice_start(peer);

   if (!res) {
      res = ast_waitfor(chan,100);
      if (res > -1) {
         for (ptr=digits; *ptr; ptr++) {
            if (*ptr == 'w') {
               res = ast_safe_sleep(chan, 500);
               if (res) 
                  break;
               continue;
            }
            memset(&f, 0, sizeof(f));
            f.frametype = AST_FRAME_DTMF;
            f.subclass = *ptr;
            f.src = "ast_dtmf_stream";
            if (strchr("0123456789*#abcdABCD",*ptr)==NULL) {
               ast_log(LOG_WARNING, "Illegal DTMF character '%c' in string. (0-9*#aAbBcCdD allowed)\n",*ptr);
            } else {
               res = ast_write(chan, &f);
               if (res) 
                  break;
               /* pause between digits */
               res = ast_safe_sleep(chan,between);
               if (res) 
                  break;
            }
         }
      }
      if (peer)
         res = ast_autoservice_stop(peer);
   }
   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)
         chan->writeinterrupt = 1;
      else
         chan->writeinterrupt = 0;
      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 (!filename || ast_strlen_zero(filename))
         return -1;
      autoclose = 1;
      if (filename[0] == '/') 
         strncpy(tmpf, filename, sizeof(tmpf) - 1);
      else
         snprintf(tmpf, sizeof(tmpf), "%s/%s/%s", (char *)ast_config_AST_VAR_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;
      }
   }
   lin = malloc(sizeof(struct linear_state));
   if (lin) {
      memset(lin, 0, 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, char *file, char *fwd, char *rev, char *stop, char *pause, int skipms) 
{
   struct timeval started, ended;
   long elapsed = 0,last_elapsed =0;
   char *breaks=NULL;
   char *end=NULL;
   int blen=2;
   int res=0;

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

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

   if (chan)
      ast_stopstream(chan);


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

   for (;;) {
      gettimeofday(&started,NULL);

      if (chan)
         ast_stopstream(chan);
      res = ast_streamfile(chan, file, chan->language);
      if (!res) {
         if (end) {
            ast_seekstream(chan->stream, 0, SEEK_END);
            end=NULL;
         }
         res = 1;
         if (elapsed) {
            ast_stream_fastforward(chan->stream, elapsed);
            last_elapsed = elapsed - 200;
         }
         if (res)
            res = ast_waitstream_fr(chan, breaks, fwd, rev, skipms);
         else
            break;
      }

      if (res < 1)
         break;

      if (pause != NULL && strchr(pause, res)) {
         gettimeofday(&ended, NULL);
         elapsed = (((ended.tv_sec * 1000) + ended.tv_usec / 1000) - ((started.tv_sec * 1000) + started.tv_usec / 1000) + last_elapsed);
         for(;;) {
            if (chan)
               ast_stopstream(chan);
            res = ast_waitfordigit(chan, 1000);
            if (res == 0)
               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)) {
         /* res = 0; */
         break;
      }
   }
   if (chan)
      ast_stopstream(chan);

   return res;
}

int ast_play_and_wait(struct ast_channel *chan, 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;

int ast_play_and_record(struct ast_channel *chan, char *playfile, char *recordfile, int maxtime, char *fmt, int *duration, int silencethreshold, int maxsilence, const char *path)
{
   int d;
   char *fmts;
   char comment[256];
   int x, fmtcnt=1, res=-1,outmsg=0;
   struct ast_frame *f;
   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 dspsilence = 0;
   int gotsilence = 0;     /* did we timeout for silence? */
   int rfmt=0;

   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) {
      d = ast_play_and_wait(chan, playfile);
      if (d > -1)
         d = ast_streamfile(chan, "beep",chan->language);
      if (!d)
         d = ast_waitstream(chan,"");
      if (d < 0)
         return -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_voicemail.c\n");
         break;
      }
      sfmt[fmtcnt++] = ast_strdupa(fmt);
   }

   time(&start);
   end=start;  /* 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(recordfile, sfmt[x], comment, O_TRUNC, 0, 0700);
      ast_verbose( VERBOSE_PREFIX_3 "x=%i, open writing:  %s format: %s, %p\n", x, 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 (x == fmtcnt) {
   /* Loop forever, writing the packets we read to the writer(s), until
      we read a # or get a hangup */
      f = NULL;
      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++) {
               res = ast_writestream(others[x], f);
            }

            /* Silence Detection */
            if (maxsilence > 0) {
               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);
                  ast_frfree(f);
                  gotsilence = 1;
                  outmsg=2;
                  break;
               }
            }
            /* Exit on any error */
            if (res) {
               ast_log(LOG_WARNING, "Error writing frame\n");
               ast_frfree(f);
               break;
            }
         } else if (f->frametype == AST_FRAME_VIDEO) {
            /* Write only once */
            ast_writestream(others[0], f);
         } else if (f->frametype == AST_FRAME_DTMF) {
            if (f->subclass == '#') {
               if (option_verbose > 2)
                  ast_verbose( VERBOSE_PREFIX_3 "User ended message by pressing %c\n", f->subclass);
               res = '#';
               outmsg = 2;
               ast_frfree(f);
               break;
            }
         }
            if (f->subclass == '0') {
            /* Check for a '0' during message recording also, in case caller wants operator */
               if (option_verbose > 2)
                  ast_verbose(VERBOSE_PREFIX_3 "User cancelled by pressing %c\n", f->subclass);
               res = '0';
               outmsg = 0;
               ast_frfree(f);
               break;
            }
         if (maxtime) {
            time(&end);
            if (maxtime < (end - start)) {
               if (option_verbose > 2)
                  ast_verbose( VERBOSE_PREFIX_3 "Took too long, cutting it short...\n");
               outmsg = 2;
               res = 't';
               ast_frfree(f);
               break;
            }
         }
         ast_frfree(f);
      }
      if (end == start) time(&end);
      if (!f) {
         if (option_verbose > 2)
            ast_verbose( VERBOSE_PREFIX_3 "User hung up\n");
         res = -1;
         outmsg=1;
      }
   } else {
      ast_log(LOG_WARNING, "Error creating writestream '%s', format '%s'\n", recordfile, sfmt[x]);
   }

   *duration = end - start;

   for (x=0;x<fmtcnt;x++) {
      if (!others[x])
         break;
      if (res > 0) {
         if (totalsilence)
            ast_stream_rewind(others[x], totalsilence-200);
         else
            ast_stream_rewind(others[x], 200);
      }
      ast_truncstream(others[x]);
      ast_closestream(others[x]);
   }
   if (rfmt) {
      if (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 > 1) {
      /* Let them know recording is stopped */
      if(!ast_streamfile(chan, "auth-thankyou", chan->language))
         ast_waitstream(chan, "");
   }
   if (sildet)
      ast_dsp_free(sildet);
   return res;
}

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)
{
   int d = 0;
   char *fmts;
   char comment[256];
   int x, fmtcnt=1, res=-1,outmsg=0;
   struct ast_frame *f;
   struct ast_filestream *others[MAX_OTHER_FORMATS];
   struct ast_filestream *realfiles[MAX_OTHER_FORMATS];
   char *sfmt[MAX_OTHER_FORMATS];
   char *stringp=NULL;
   time_t start, end;
   struct ast_dsp *sildet;    /* silence detector dsp */
   int totalsilence = 0;
   int dspsilence = 0;
   int gotsilence = 0;     /* did we timeout for silence? */
   int rfmt=0; 
   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_prepend called without duration pointer\n");
      return -1;
   }

   ast_log(LOG_DEBUG,"play_and_prepend: %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_streamfile(chan, "beep",chan->language);
      if (!d)
         d = ast_waitstream(chan,"");
      if (d < 0)
         return -1;
   }
   strncpy(prependfile, recordfile, sizeof(prependfile) -1);   
   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_voicemail.c\n");
         break;
      }
      sfmt[fmtcnt++] = ast_strdupa(fmt);
   }

   time(&start);
   end=start;  /* 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(prependfile, sfmt[x], comment, O_TRUNC, 0, 0700);
      ast_verbose( VERBOSE_PREFIX_3 "x=%i, open writing:  %s format: %s, %p\n", x, prependfile, sfmt[x], others[x]);
      if (!others[x]) {
         break;
      }
   }
   
   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);

   if (maxsilence > 0) {
      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");
         return -1;
      }
   }
                  
   if (x == fmtcnt) {
   /* Loop forever, writing the packets we read to the writer(s), until
      we read a # or get a hangup */
      f = NULL;
      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 (!others[x])
                  break;
               res = ast_writestream(others[x], f);
            }
            
            /* Silence Detection */
            if (maxsilence > 0) {
               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);
               ast_frfree(f);
               gotsilence = 1;
               outmsg=2;
               break;
               }
            }
            /* Exit on any error */
            if (res) {
               ast_log(LOG_WARNING, "Error writing frame\n");
               ast_frfree(f);
               break;
            }
         } else if (f->frametype == AST_FRAME_VIDEO) {
            /* Write only once */
            ast_writestream(others[0], f);
         } else if (f->frametype == AST_FRAME_DTMF) {
            /* 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;
            ast_frfree(f);
            break;
         }
         if (maxtime) {
            time(&end);
            if (maxtime < (end - start)) {
               if (option_verbose > 2)
                  ast_verbose( VERBOSE_PREFIX_3 "Took too long, cutting it short...\n");
               res = 't';
               outmsg=2;
               ast_frfree(f);
               break;
            }
         }
         ast_frfree(f);
      }
      if (end == start) time(&end);
      if (!f) {
         if (option_verbose > 2) 
            ast_verbose( VERBOSE_PREFIX_3 "User hung up\n");
         res = -1;
         outmsg=1;
#if 0
         /* delete all the prepend files */
         for (x=0;x<fmtcnt;x++) {
            if (!others[x])
               break;
            ast_closestream(others[x]);
            ast_filedelete(prependfile, sfmt[x]);
         }
#endif
      }
   } else {
      ast_log(LOG_WARNING, "Error creating writestream '%s', format '%s'\n", prependfile, sfmt[x]); 
   }
   *duration = end - start;
#if 0
   if (outmsg > 1) {
#else
   if (outmsg) {
#endif
      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;
         if (totalsilence)
            ast_stream_rewind(others[x], totalsilence-200);
         else
            ast_stream_rewind(others[x], 200);
         ast_truncstream(others[x]);
         /* add the original file too */
         while ((fr = ast_readframe(realfiles[x]))) {
            ast_writestream(others[x],fr);
         }
         ast_closestream(others[x]);
         ast_closestream(realfiles[x]);
         ast_filerename(prependfile, recordfile, sfmt[x]);
#if 0
         ast_verbose("Recording Format: sfmts=%s, prependfile %s, recordfile %s\n", sfmt[x],prependfile,recordfile);
#endif
         ast_filedelete(prependfile, sfmt[x]);
      }
   }
   if (rfmt) {
      if (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) {
      if (outmsg > 1) {
         /* Let them know it worked */
         ast_streamfile(chan, "auth-thankyou", chan->language);
         ast_waitstream(chan, "");
      }
   }  
   return res;
}

int ast_lock_path(const char *path)
{
   char *s;
   char *fs;
   int res;
   int fd;
   time_t start;
   s = alloca(strlen(path) + 10);
   fs = alloca(strlen(path) + 20);
   if (!fs || !s) {
      ast_log(LOG_WARNING, "Out of memory!\n");
      return -1;
   }
   snprintf(fs, strlen(path) + 19, "%s/%s-%08x", path, ".lock", rand());
   fd = open(fs, O_WRONLY | O_CREAT | O_EXCL, 0600);
   if (fd < 0) {
      fprintf(stderr, "Unable to create lock file: %s\n", strerror(errno));
      return -1;
   }
   close(fd);
   snprintf(s, strlen(path) + 9, "%s/%s", path, ".lock");
   time(&start);
   while (((res = link(fs, s)) < 0) && (errno == EEXIST) && (time(NULL) - start < 5))
      usleep(1);
   if (res < 0) {
      ast_log(LOG_WARNING, "Failed to lock path '%s': %s\n", path, strerror(errno));
   }
   unlink(fs);
   ast_log(LOG_DEBUG, "Locked path '%s'\n", path);
   return res;
}

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

---