Thu Apr 28 2011 17:15:31

Asterisk developer's documentation


app_record.c File Reference

Trivial application to record a sound file. More...

#include "asterisk.h"
#include "asterisk/file.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/channel.h"
#include "asterisk/dsp.h"
Include dependency graph for app_record.c:

Go to the source code of this file.

Enumerations

enum  {
  OPTION_APPEND = (1 << 0), OPTION_NOANSWER = (1 << 1), OPTION_QUIET = (1 << 2), OPTION_SKIP = (1 << 3),
  OPTION_STAR_TERMINATE = (1 << 4), OPTION_IGNORE_TERMINATE = (1 << 5), OPTION_KEEP = (1 << 6), FLAG_HAS_PERCENT = (1 << 7)
}

Functions

static void __reg_module (void)
static void __unreg_module (void)
static int load_module (void)
static int record_exec (struct ast_channel *chan, void *data)
static int unload_module (void)

Variables

static struct ast_module_info
__MODULE_INFO_SECTION 
__mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Trivial Record Application" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, }
static char * app = "Record"
static struct ast_app_option app_opts [128] = { [ 'a' ] = { .flag = OPTION_APPEND }, [ 'k' ] = { .flag = OPTION_KEEP }, [ 'n' ] = { .flag = OPTION_NOANSWER }, [ 'q' ] = { .flag = OPTION_QUIET }, [ 's' ] = { .flag = OPTION_SKIP }, [ 't' ] = { .flag = OPTION_STAR_TERMINATE }, [ 'x' ] = { .flag = OPTION_IGNORE_TERMINATE },}
static struct ast_module_infoast_module_info = &__mod_info

Detailed Description

Trivial application to record a sound file.

Author:
Matthew Fredrickson <creslin@digium.com>

Definition in file app_record.c.


Enumeration Type Documentation

anonymous enum
Enumerator:
OPTION_APPEND 
OPTION_NOANSWER 
OPTION_QUIET 
OPTION_SKIP 
OPTION_STAR_TERMINATE 
OPTION_IGNORE_TERMINATE 
OPTION_KEEP 
FLAG_HAS_PERCENT 

Definition at line 111 of file app_record.c.

     {
   OPTION_APPEND = (1 << 0),
   OPTION_NOANSWER = (1 << 1),
   OPTION_QUIET = (1 << 2),
   OPTION_SKIP = (1 << 3),
   OPTION_STAR_TERMINATE = (1 << 4),
   OPTION_IGNORE_TERMINATE = (1 << 5),
   OPTION_KEEP = (1 << 6),
   FLAG_HAS_PERCENT = (1 << 7),
};

Function Documentation

static void __reg_module ( void  ) [static]

Definition at line 426 of file app_record.c.

static void __unreg_module ( void  ) [static]

Definition at line 426 of file app_record.c.

static int load_module ( void  ) [static]

Definition at line 421 of file app_record.c.

References ast_register_application_xml, and record_exec().

static int record_exec ( struct ast_channel chan,
void *  data 
) [static]

Definition at line 132 of file app_record.c.

References ast_channel::_state, app_opts, ast_answer(), AST_APP_ARG, ast_app_parse_options(), ast_channel_start_silence_generator(), ast_channel_stop_silence_generator(), ast_closestream(), AST_CONTROL_VIDUPDATE, ast_copy_string(), ast_debug, AST_DECLARE_APP_ARGS, ast_dsp_free(), ast_dsp_get_threshold_from_settings(), ast_dsp_new(), ast_dsp_set_threshold(), ast_dsp_silence(), AST_FILE_MODE, ast_filedelete(), ast_fileexists(), AST_FORMAT_SLINEAR, AST_FRAME_DTMF, AST_FRAME_VIDEO, AST_FRAME_VOICE, ast_frfree, ast_indicate(), ast_log(), ast_mkdir(), AST_NONSTANDARD_APP_ARGS, ast_opt_transmit_silence, ast_read(), ast_set_flag, ast_set_read_format(), AST_STANDARD_APP_ARGS, AST_STATE_UP, ast_stopstream(), ast_strdupa, ast_stream_rewind(), ast_streamfile(), ast_strlen_zero(), ast_test_flag, ast_truncstream(), ast_waitfor(), ast_waitstream(), ast_writefile(), ast_writestream(), dir, ext, f, FLAG_HAS_PERCENT, ast_frame::frametype, ast_channel::language, LOG_WARNING, ast_channel::name, OPTION_APPEND, OPTION_IGNORE_TERMINATE, OPTION_KEEP, OPTION_NOANSWER, OPTION_QUIET, OPTION_SKIP, OPTION_STAR_TERMINATE, parse(), pbx_builtin_setvar_helper(), ast_channel::readformat, s, ast_frame::subclass, THRESHOLD_SILENCE, and ast_dsp::totalsilence.

Referenced by load_module().

{
   int res = 0;
   int count = 0;
   char *ext = NULL, *opts[0];
   char *parse, *dir, *file;
   int i = 0;
   char tmp[256];

   struct ast_filestream *s = NULL;
   struct ast_frame *f = NULL;
   
   struct ast_dsp *sildet = NULL;      /* silence detector dsp */
   int totalsilence = 0;
   int dspsilence = 0;
   int silence = 0;     /* amount of silence to allow */
   int gotsilence = 0;     /* did we timeout for silence? */
   int maxduration = 0;    /* max duration of recording in milliseconds */
   int gottimeout = 0;     /* did we timeout for maxduration exceeded? */
   int terminator = '#';
   int rfmt = 0;
   int ioflags;
   int waitres;
   struct ast_silence_generator *silgen = NULL;
   struct ast_flags flags = { 0, };
   AST_DECLARE_APP_ARGS(args,
      AST_APP_ARG(filename);
      AST_APP_ARG(silence);
      AST_APP_ARG(maxduration);
      AST_APP_ARG(options);
   );
   
   /* The next few lines of code parse out the filename and header from the input string */
   if (ast_strlen_zero(data)) { /* no data implies no filename or anything is present */
      ast_log(LOG_WARNING, "Record requires an argument (filename)\n");
      pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
      return -1;
   }

   parse = ast_strdupa(data);
   AST_STANDARD_APP_ARGS(args, parse);
   if (args.argc == 4)
      ast_app_parse_options(app_opts, &flags, opts, args.options);

   if (!ast_strlen_zero(args.filename)) {
      if (strstr(args.filename, "%d"))
         ast_set_flag(&flags, FLAG_HAS_PERCENT);
      ext = strrchr(args.filename, '.'); /* to support filename with a . in the filename, not format */
      if (!ext)
         ext = strchr(args.filename, ':');
      if (ext) {
         *ext = '\0';
         ext++;
      }
   }
   if (!ext) {
      ast_log(LOG_WARNING, "No extension specified to filename!\n");
      pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
      return -1;
   }
   if (args.silence) {
      if ((sscanf(args.silence, "%30d", &i) == 1) && (i > -1)) {
         silence = i * 1000;
      } else if (!ast_strlen_zero(args.silence)) {
         ast_log(LOG_WARNING, "'%s' is not a valid silence duration\n", args.silence);
      }
   }
   
   if (args.maxduration) {
      if ((sscanf(args.maxduration, "%30d", &i) == 1) && (i > -1))
         /* Convert duration to milliseconds */
         maxduration = i * 1000;
      else if (!ast_strlen_zero(args.maxduration))
         ast_log(LOG_WARNING, "'%s' is not a valid maximum duration\n", args.maxduration);
   }

   if (ast_test_flag(&flags, OPTION_STAR_TERMINATE))
      terminator = '*';
   if (ast_test_flag(&flags, OPTION_IGNORE_TERMINATE))
      terminator = '\0';

   /* done parsing */

   /* these are to allow the use of the %d in the config file for a wild card of sort to
     create a new file with the inputed name scheme */
   if (ast_test_flag(&flags, FLAG_HAS_PERCENT)) {
      AST_DECLARE_APP_ARGS(fname,
         AST_APP_ARG(piece)[100];
      );
      char *tmp2 = ast_strdupa(args.filename);
      char countstring[15];
      int idx;

      /* Separate each piece out by the format specifier */
      AST_NONSTANDARD_APP_ARGS(fname, tmp2, '%');
      do {
         int tmplen;
         /* First piece has no leading percent, so it's copied verbatim */
         ast_copy_string(tmp, fname.piece[0], sizeof(tmp));
         tmplen = strlen(tmp);
         for (idx = 1; idx < fname.argc; idx++) {
            if (fname.piece[idx][0] == 'd') {
               /* Substitute the count */
               snprintf(countstring, sizeof(countstring), "%d", count);
               ast_copy_string(tmp + tmplen, countstring, sizeof(tmp) - tmplen);
               tmplen += strlen(countstring);
            } else if (tmplen + 2 < sizeof(tmp)) {
               /* Unknown format specifier - just copy it verbatim */
               tmp[tmplen++] = '%';
               tmp[tmplen++] = fname.piece[idx][0];
            }
            /* Copy the remaining portion of the piece */
            ast_copy_string(tmp + tmplen, &(fname.piece[idx][1]), sizeof(tmp) - tmplen);
         }
         count++;
      } while (ast_fileexists(tmp, ext, chan->language) > 0);
      pbx_builtin_setvar_helper(chan, "RECORDED_FILE", tmp);
   } else
      ast_copy_string(tmp, args.filename, sizeof(tmp));
   /* end of routine mentioned */

   if (chan->_state != AST_STATE_UP) {
      if (ast_test_flag(&flags, OPTION_SKIP)) {
         /* At the user's option, skip if the line is not up */
         pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "SKIP");
         return 0;
      } else if (!ast_test_flag(&flags, OPTION_NOANSWER)) {
         /* Otherwise answer unless we're supposed to record while on-hook */
         res = ast_answer(chan);
      }
   }

   if (res) {
      ast_log(LOG_WARNING, "Could not answer channel '%s'\n", chan->name);
      pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
      goto out;
   }

   if (!ast_test_flag(&flags, OPTION_QUIET)) {
      /* Some code to play a nice little beep to signify the start of the record operation */
      res = ast_streamfile(chan, "beep", chan->language);
      if (!res) {
         res = ast_waitstream(chan, "");
      } else {
         ast_log(LOG_WARNING, "ast_streamfile failed on %s\n", chan->name);
      }
      ast_stopstream(chan);
   }

   /* The end of beep code.  Now the recording starts */

   if (silence > 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");
         pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
         return -1;
      }
      sildet = ast_dsp_new();
      if (!sildet) {
         ast_log(LOG_WARNING, "Unable to create silence detector :(\n");
         pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
         return -1;
      }
      ast_dsp_set_threshold(sildet, ast_dsp_get_threshold_from_settings(THRESHOLD_SILENCE));
   } 

   /* Create the directory if it does not exist. */
   dir = ast_strdupa(tmp);
   if ((file = strrchr(dir, '/')))
      *file++ = '\0';
   ast_mkdir (dir, 0777);

   ioflags = ast_test_flag(&flags, OPTION_APPEND) ? O_CREAT|O_APPEND|O_WRONLY : O_CREAT|O_TRUNC|O_WRONLY;
   s = ast_writefile(tmp, ext, NULL, ioflags, 0, AST_FILE_MODE);

   if (!s) {
      ast_log(LOG_WARNING, "Could not create file %s\n", args.filename);
      pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
      goto out;
   }

   if (ast_opt_transmit_silence)
      silgen = ast_channel_start_silence_generator(chan);

   /* Request a video update */
   ast_indicate(chan, AST_CONTROL_VIDUPDATE);

   if (maxduration <= 0)
      maxduration = -1;

   while ((waitres = ast_waitfor(chan, maxduration)) > -1) {
      if (maxduration > 0) {
         if (waitres == 0) {
            gottimeout = 1;
            pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "TIMEOUT");
            break;
         }
         maxduration = waitres;
      }

      f = ast_read(chan);
      if (!f) {
         res = -1;
         break;
      }
      if (f->frametype == AST_FRAME_VOICE) {
         res = ast_writestream(s, f);

         if (res) {
            ast_log(LOG_WARNING, "Problem writing frame\n");
            ast_frfree(f);
            pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
            break;
         }

         if (silence > 0) {
            dspsilence = 0;
            ast_dsp_silence(sildet, f, &dspsilence);
            if (dspsilence) {
               totalsilence = dspsilence;
            } else {
               totalsilence = 0;
            }
            if (totalsilence > silence) {
               /* Ended happily with silence */
               ast_frfree(f);
               gotsilence = 1;
               pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "SILENCE");
               break;
            }
         }
      } else if (f->frametype == AST_FRAME_VIDEO) {
         res = ast_writestream(s, f);

         if (res) {
            ast_log(LOG_WARNING, "Problem writing frame\n");
            pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "ERROR");
            ast_frfree(f);
            break;
         }
      } else if ((f->frametype == AST_FRAME_DTMF) &&
          (f->subclass == terminator)) {
         ast_frfree(f);
         pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "DTMF");
         break;
      }
      ast_frfree(f);
   }
   if (!f) {
      ast_debug(1, "Got hangup\n");
      res = -1;
      pbx_builtin_setvar_helper(chan, "RECORD_STATUS", "HANGUP");
      if (!ast_test_flag(&flags, OPTION_KEEP)) {
         ast_filedelete(args.filename, NULL);
      }
   }

   if (gotsilence) {
      ast_stream_rewind(s, silence - 1000);
      ast_truncstream(s);
   } else if (!gottimeout) {
      /* Strip off the last 1/4 second of it */
      ast_stream_rewind(s, 250);
      ast_truncstream(s);
   }
   ast_closestream(s);

   if (silgen)
      ast_channel_stop_silence_generator(chan, silgen);

out:
   if ((silence > 0) && rfmt) {
      res = ast_set_read_format(chan, rfmt);
      if (res)
         ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", chan->name);
      if (sildet)
         ast_dsp_free(sildet);
   }

   return res;
}
static int unload_module ( void  ) [static]

Definition at line 416 of file app_record.c.

References ast_unregister_application().


Variable Documentation

struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Trivial Record Application" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, } [static]

Definition at line 426 of file app_record.c.

char* app = "Record" [static]

Definition at line 109 of file app_record.c.

struct ast_app_option app_opts[128] = { [ 'a' ] = { .flag = OPTION_APPEND }, [ 'k' ] = { .flag = OPTION_KEEP }, [ 'n' ] = { .flag = OPTION_NOANSWER }, [ 'q' ] = { .flag = OPTION_QUIET }, [ 's' ] = { .flag = OPTION_SKIP }, [ 't' ] = { .flag = OPTION_STAR_TERMINATE }, [ 'x' ] = { .flag = OPTION_IGNORE_TERMINATE },} [static]

Definition at line 130 of file app_record.c.

Referenced by record_exec().

Definition at line 426 of file app_record.c.