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cfc6f60ca3
Update and extend the configuration_file group and enable linking to the application. Update title that was left behind many years ago. (issue ASTERISK-20259) git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@375004 65c4cc65-6c06-0410-ace0-fbb531ad65f3
532 lines
19 KiB
C
532 lines
19 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2003 - 2006, Aheeva Technology.
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*
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* Claude Klimos (claude.klimos@aheeva.com)
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*
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* A license has been granted to Digium (via disclaimer) for the use of
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* this code.
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*/
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/*! \file
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*
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* \brief Answering machine detection
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*
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* \author Claude Klimos (claude.klimos@aheeva.com)
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*
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* \ingroup applications
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*/
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/*! \li \ref app_amd.c uses the configuration file \ref amd.conf
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* \addtogroup configuration_file Configuration Files
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*/
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/*!
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* \page amd.conf amd.conf
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* \verbinclude amd.conf.sample
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*/
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/*** MODULEINFO
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<support_level>extended</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/module.h"
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#include "asterisk/lock.h"
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#include "asterisk/channel.h"
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#include "asterisk/dsp.h"
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#include "asterisk/pbx.h"
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#include "asterisk/config.h"
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#include "asterisk/app.h"
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/*** DOCUMENTATION
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<application name="AMD" language="en_US">
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<synopsis>
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Attempt to detect answering machines.
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</synopsis>
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<syntax>
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<parameter name="initialSilence" required="false">
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<para>Is maximum initial silence duration before greeting.</para>
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<para>If this is exceeded set as MACHINE</para>
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</parameter>
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<parameter name="greeting" required="false">
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<para>is the maximum length of a greeting.</para>
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<para>If this is exceeded set as MACHINE</para>
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</parameter>
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<parameter name="afterGreetingSilence" required="false">
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<para>Is the silence after detecting a greeting.</para>
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<para>If this is exceeded set as HUMAN</para>
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</parameter>
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<parameter name="totalAnalysis Time" required="false">
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<para>Is the maximum time allowed for the algorithm</para>
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<para>to decide HUMAN or MACHINE</para>
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</parameter>
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<parameter name="miniumWordLength" required="false">
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<para>Is the minimum duration of Voice considered to be a word</para>
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</parameter>
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<parameter name="betweenWordSilence" required="false">
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<para>Is the minimum duration of silence after a word to
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consider the audio that follows to be a new word</para>
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</parameter>
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<parameter name="maximumNumberOfWords" required="false">
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<para>Is the maximum number of words in a greeting</para>
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<para>If this is exceeded set as MACHINE</para>
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</parameter>
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<parameter name="silenceThreshold" required="false">
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<para>How long do we consider silence</para>
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</parameter>
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<parameter name="maximumWordLength" required="false">
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<para>Is the maximum duration of a word to accept.</para>
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<para>If exceeded set as MACHINE</para>
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</parameter>
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</syntax>
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<description>
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<para>This application attempts to detect answering machines at the beginning
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of outbound calls. Simply call this application after the call
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has been answered (outbound only, of course).</para>
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<para>When loaded, AMD reads amd.conf and uses the parameters specified as
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default values. Those default values get overwritten when the calling AMD
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with parameters.</para>
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<para>This application sets the following channel variables:</para>
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<variablelist>
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<variable name="AMDSTATUS">
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<para>This is the status of the answering machine detection</para>
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<value name="MACHINE" />
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<value name="HUMAN" />
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<value name="NOTSURE" />
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<value name="HANGUP" />
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</variable>
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<variable name="AMDCAUSE">
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<para>Indicates the cause that led to the conclusion</para>
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<value name="TOOLONG">
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Total Time.
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</value>
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<value name="INITIALSILENCE">
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Silence Duration - Initial Silence.
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</value>
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<value name="HUMAN">
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Silence Duration - afterGreetingSilence.
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</value>
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<value name="LONGGREETING">
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Voice Duration - Greeting.
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</value>
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<value name="MAXWORDLENGTH">
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Word Count - maximum number of words.
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</value>
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</variable>
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</variablelist>
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</description>
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<see-also>
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<ref type="application">WaitForSilence</ref>
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<ref type="application">WaitForNoise</ref>
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</see-also>
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</application>
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***/
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static const char app[] = "AMD";
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#define STATE_IN_WORD 1
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#define STATE_IN_SILENCE 2
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/* Some default values for the algorithm parameters. These defaults will be overwritten from amd.conf */
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static int dfltInitialSilence = 2500;
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static int dfltGreeting = 1500;
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static int dfltAfterGreetingSilence = 800;
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static int dfltTotalAnalysisTime = 5000;
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static int dfltMinimumWordLength = 100;
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static int dfltBetweenWordsSilence = 50;
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static int dfltMaximumNumberOfWords = 3;
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static int dfltSilenceThreshold = 256;
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static int dfltMaximumWordLength = 5000; /* Setting this to a large default so it is not used unless specify it in the configs or command line */
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/* Set to the lowest ms value provided in amd.conf or application parameters */
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static int dfltMaxWaitTimeForFrame = 50;
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static void isAnsweringMachine(struct ast_channel *chan, const char *data)
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{
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int res = 0;
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struct ast_frame *f = NULL;
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struct ast_dsp *silenceDetector = NULL;
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int dspsilence = 0, framelength = 0;
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struct ast_format readFormat;
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int inInitialSilence = 1;
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int inGreeting = 0;
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int voiceDuration = 0;
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int silenceDuration = 0;
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int iTotalTime = 0;
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int iWordsCount = 0;
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int currentState = STATE_IN_WORD;
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int consecutiveVoiceDuration = 0;
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char amdCause[256] = "", amdStatus[256] = "";
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char *parse = ast_strdupa(data);
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/* Lets set the initial values of the variables that will control the algorithm.
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The initial values are the default ones. If they are passed as arguments
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when invoking the application, then the default values will be overwritten
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by the ones passed as parameters. */
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int initialSilence = dfltInitialSilence;
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int greeting = dfltGreeting;
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int afterGreetingSilence = dfltAfterGreetingSilence;
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int totalAnalysisTime = dfltTotalAnalysisTime;
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int minimumWordLength = dfltMinimumWordLength;
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int betweenWordsSilence = dfltBetweenWordsSilence;
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int maximumNumberOfWords = dfltMaximumNumberOfWords;
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int silenceThreshold = dfltSilenceThreshold;
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int maximumWordLength = dfltMaximumWordLength;
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int maxWaitTimeForFrame = dfltMaxWaitTimeForFrame;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(argInitialSilence);
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AST_APP_ARG(argGreeting);
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AST_APP_ARG(argAfterGreetingSilence);
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AST_APP_ARG(argTotalAnalysisTime);
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AST_APP_ARG(argMinimumWordLength);
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AST_APP_ARG(argBetweenWordsSilence);
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AST_APP_ARG(argMaximumNumberOfWords);
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AST_APP_ARG(argSilenceThreshold);
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AST_APP_ARG(argMaximumWordLength);
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);
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ast_format_clear(&readFormat);
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ast_verb(3, "AMD: %s %s %s (Fmt: %s)\n", ast_channel_name(chan),
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S_COR(ast_channel_caller(chan)->ani.number.valid, ast_channel_caller(chan)->ani.number.str, "(N/A)"),
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S_COR(ast_channel_redirecting(chan)->from.number.valid, ast_channel_redirecting(chan)->from.number.str, "(N/A)"),
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ast_getformatname(ast_channel_readformat(chan)));
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/* Lets parse the arguments. */
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if (!ast_strlen_zero(parse)) {
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/* Some arguments have been passed. Lets parse them and overwrite the defaults. */
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AST_STANDARD_APP_ARGS(args, parse);
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if (!ast_strlen_zero(args.argInitialSilence))
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initialSilence = atoi(args.argInitialSilence);
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if (!ast_strlen_zero(args.argGreeting))
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greeting = atoi(args.argGreeting);
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if (!ast_strlen_zero(args.argAfterGreetingSilence))
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afterGreetingSilence = atoi(args.argAfterGreetingSilence);
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if (!ast_strlen_zero(args.argTotalAnalysisTime))
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totalAnalysisTime = atoi(args.argTotalAnalysisTime);
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if (!ast_strlen_zero(args.argMinimumWordLength))
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minimumWordLength = atoi(args.argMinimumWordLength);
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if (!ast_strlen_zero(args.argBetweenWordsSilence))
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betweenWordsSilence = atoi(args.argBetweenWordsSilence);
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if (!ast_strlen_zero(args.argMaximumNumberOfWords))
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maximumNumberOfWords = atoi(args.argMaximumNumberOfWords);
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if (!ast_strlen_zero(args.argSilenceThreshold))
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silenceThreshold = atoi(args.argSilenceThreshold);
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if (!ast_strlen_zero(args.argMaximumWordLength))
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maximumWordLength = atoi(args.argMaximumWordLength);
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} else {
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ast_debug(1, "AMD using the default parameters.\n");
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}
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/* Find lowest ms value, that will be max wait time for a frame */
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if (maxWaitTimeForFrame > initialSilence)
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maxWaitTimeForFrame = initialSilence;
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if (maxWaitTimeForFrame > greeting)
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maxWaitTimeForFrame = greeting;
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if (maxWaitTimeForFrame > afterGreetingSilence)
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maxWaitTimeForFrame = afterGreetingSilence;
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if (maxWaitTimeForFrame > totalAnalysisTime)
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maxWaitTimeForFrame = totalAnalysisTime;
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if (maxWaitTimeForFrame > minimumWordLength)
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maxWaitTimeForFrame = minimumWordLength;
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if (maxWaitTimeForFrame > betweenWordsSilence)
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maxWaitTimeForFrame = betweenWordsSilence;
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/* Now we're ready to roll! */
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ast_verb(3, "AMD: initialSilence [%d] greeting [%d] afterGreetingSilence [%d] "
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"totalAnalysisTime [%d] minimumWordLength [%d] betweenWordsSilence [%d] maximumNumberOfWords [%d] silenceThreshold [%d] maximumWordLength [%d] \n",
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initialSilence, greeting, afterGreetingSilence, totalAnalysisTime,
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minimumWordLength, betweenWordsSilence, maximumNumberOfWords, silenceThreshold, maximumWordLength);
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/* Set read format to signed linear so we get signed linear frames in */
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ast_format_copy(&readFormat, ast_channel_readformat(chan));
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if (ast_set_read_format_by_id(chan, AST_FORMAT_SLINEAR) < 0 ) {
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ast_log(LOG_WARNING, "AMD: Channel [%s]. Unable to set to linear mode, giving up\n", ast_channel_name(chan));
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pbx_builtin_setvar_helper(chan , "AMDSTATUS", "");
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pbx_builtin_setvar_helper(chan , "AMDCAUSE", "");
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return;
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}
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/* Create a new DSP that will detect the silence */
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if (!(silenceDetector = ast_dsp_new())) {
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ast_log(LOG_WARNING, "AMD: Channel [%s]. Unable to create silence detector :(\n", ast_channel_name(chan));
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pbx_builtin_setvar_helper(chan , "AMDSTATUS", "");
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pbx_builtin_setvar_helper(chan , "AMDCAUSE", "");
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return;
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}
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/* Set silence threshold to specified value */
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ast_dsp_set_threshold(silenceDetector, silenceThreshold);
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/* Now we go into a loop waiting for frames from the channel */
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while ((res = ast_waitfor(chan, 2 * maxWaitTimeForFrame)) > -1) {
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/* If we fail to read in a frame, that means they hung up */
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if (!(f = ast_read(chan))) {
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ast_verb(3, "AMD: Channel [%s]. HANGUP\n", ast_channel_name(chan));
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ast_debug(1, "Got hangup\n");
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strcpy(amdStatus, "HANGUP");
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res = 1;
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break;
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}
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if (f->frametype == AST_FRAME_VOICE || f->frametype == AST_FRAME_NULL || f->frametype == AST_FRAME_CNG) {
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/* If the total time exceeds the analysis time then give up as we are not too sure */
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if (f->frametype == AST_FRAME_VOICE) {
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framelength = (ast_codec_get_samples(f) / DEFAULT_SAMPLES_PER_MS);
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} else {
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framelength = 2 * maxWaitTimeForFrame;
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}
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iTotalTime += framelength;
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if (iTotalTime >= totalAnalysisTime) {
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ast_verb(3, "AMD: Channel [%s]. Too long...\n", ast_channel_name(chan));
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ast_frfree(f);
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strcpy(amdStatus , "NOTSURE");
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sprintf(amdCause , "TOOLONG-%d", iTotalTime);
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break;
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}
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/* Feed the frame of audio into the silence detector and see if we get a result */
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if (f->frametype != AST_FRAME_VOICE)
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dspsilence += 2 * maxWaitTimeForFrame;
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else {
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dspsilence = 0;
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ast_dsp_silence(silenceDetector, f, &dspsilence);
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}
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if (dspsilence > 0) {
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silenceDuration = dspsilence;
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if (silenceDuration >= betweenWordsSilence) {
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if (currentState != STATE_IN_SILENCE ) {
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ast_verb(3, "AMD: Channel [%s]. Changed state to STATE_IN_SILENCE\n", ast_channel_name(chan));
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}
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/* Find words less than word duration */
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if (consecutiveVoiceDuration < minimumWordLength && consecutiveVoiceDuration > 0){
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ast_verb(3, "AMD: Channel [%s]. Short Word Duration: %d\n", ast_channel_name(chan), consecutiveVoiceDuration);
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}
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currentState = STATE_IN_SILENCE;
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consecutiveVoiceDuration = 0;
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}
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if (inInitialSilence == 1 && silenceDuration >= initialSilence) {
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ast_verb(3, "AMD: Channel [%s]. ANSWERING MACHINE: silenceDuration:%d initialSilence:%d\n",
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ast_channel_name(chan), silenceDuration, initialSilence);
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ast_frfree(f);
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strcpy(amdStatus , "MACHINE");
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sprintf(amdCause , "INITIALSILENCE-%d-%d", silenceDuration, initialSilence);
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res = 1;
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break;
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}
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if (silenceDuration >= afterGreetingSilence && inGreeting == 1) {
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ast_verb(3, "AMD: Channel [%s]. HUMAN: silenceDuration:%d afterGreetingSilence:%d\n",
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ast_channel_name(chan), silenceDuration, afterGreetingSilence);
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ast_frfree(f);
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strcpy(amdStatus , "HUMAN");
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sprintf(amdCause , "HUMAN-%d-%d", silenceDuration, afterGreetingSilence);
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res = 1;
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break;
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}
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} else {
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consecutiveVoiceDuration += framelength;
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voiceDuration += framelength;
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/* If I have enough consecutive voice to say that I am in a Word, I can only increment the
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number of words if my previous state was Silence, which means that I moved into a word. */
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if (consecutiveVoiceDuration >= minimumWordLength && currentState == STATE_IN_SILENCE) {
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iWordsCount++;
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ast_verb(3, "AMD: Channel [%s]. Word detected. iWordsCount:%d\n", ast_channel_name(chan), iWordsCount);
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currentState = STATE_IN_WORD;
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}
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if (consecutiveVoiceDuration >= maximumWordLength){
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ast_verb(3, "AMD: Channel [%s]. Maximum Word Length detected. [%d]\n", ast_channel_name(chan), consecutiveVoiceDuration);
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ast_frfree(f);
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strcpy(amdStatus , "MACHINE");
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sprintf(amdCause , "MAXWORDLENGTH-%d", consecutiveVoiceDuration);
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break;
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}
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if (iWordsCount >= maximumNumberOfWords) {
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ast_verb(3, "AMD: Channel [%s]. ANSWERING MACHINE: iWordsCount:%d\n", ast_channel_name(chan), iWordsCount);
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ast_frfree(f);
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strcpy(amdStatus , "MACHINE");
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sprintf(amdCause , "MAXWORDS-%d-%d", iWordsCount, maximumNumberOfWords);
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res = 1;
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break;
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}
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if (inGreeting == 1 && voiceDuration >= greeting) {
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ast_verb(3, "AMD: Channel [%s]. ANSWERING MACHINE: voiceDuration:%d greeting:%d\n", ast_channel_name(chan), voiceDuration, greeting);
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ast_frfree(f);
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strcpy(amdStatus , "MACHINE");
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sprintf(amdCause , "LONGGREETING-%d-%d", voiceDuration, greeting);
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res = 1;
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break;
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}
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if (voiceDuration >= minimumWordLength ) {
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if (silenceDuration > 0)
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ast_verb(3, "AMD: Channel [%s]. Detected Talk, previous silence duration: %d\n", ast_channel_name(chan), silenceDuration);
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silenceDuration = 0;
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}
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if (consecutiveVoiceDuration >= minimumWordLength && inGreeting == 0) {
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/* Only go in here once to change the greeting flag when we detect the 1st word */
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if (silenceDuration > 0)
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ast_verb(3, "AMD: Channel [%s]. Before Greeting Time: silenceDuration: %d voiceDuration: %d\n", ast_channel_name(chan), silenceDuration, voiceDuration);
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inInitialSilence = 0;
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inGreeting = 1;
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}
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}
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}
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ast_frfree(f);
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}
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if (!res) {
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/* It took too long to get a frame back. Giving up. */
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ast_verb(3, "AMD: Channel [%s]. Too long...\n", ast_channel_name(chan));
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strcpy(amdStatus , "NOTSURE");
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sprintf(amdCause , "TOOLONG-%d", iTotalTime);
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}
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/* Set the status and cause on the channel */
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pbx_builtin_setvar_helper(chan , "AMDSTATUS" , amdStatus);
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pbx_builtin_setvar_helper(chan , "AMDCAUSE" , amdCause);
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/* Restore channel read format */
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if (readFormat.id && ast_set_read_format(chan, &readFormat))
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ast_log(LOG_WARNING, "AMD: Unable to restore read format on '%s'\n", ast_channel_name(chan));
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/* Free the DSP used to detect silence */
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ast_dsp_free(silenceDetector);
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return;
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}
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static int amd_exec(struct ast_channel *chan, const char *data)
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{
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isAnsweringMachine(chan, data);
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return 0;
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}
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static int load_config(int reload)
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{
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struct ast_config *cfg = NULL;
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char *cat = NULL;
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struct ast_variable *var = NULL;
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struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
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dfltSilenceThreshold = ast_dsp_get_threshold_from_settings(THRESHOLD_SILENCE);
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if (!(cfg = ast_config_load("amd.conf", config_flags))) {
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ast_log(LOG_ERROR, "Configuration file amd.conf missing.\n");
|
|
return -1;
|
|
} else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
|
|
return 0;
|
|
} else if (cfg == CONFIG_STATUS_FILEINVALID) {
|
|
ast_log(LOG_ERROR, "Config file amd.conf is in an invalid format. Aborting.\n");
|
|
return -1;
|
|
}
|
|
|
|
cat = ast_category_browse(cfg, NULL);
|
|
|
|
while (cat) {
|
|
if (!strcasecmp(cat, "general") ) {
|
|
var = ast_variable_browse(cfg, cat);
|
|
while (var) {
|
|
if (!strcasecmp(var->name, "initial_silence")) {
|
|
dfltInitialSilence = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "greeting")) {
|
|
dfltGreeting = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "after_greeting_silence")) {
|
|
dfltAfterGreetingSilence = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "silence_threshold")) {
|
|
dfltSilenceThreshold = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "total_analysis_time")) {
|
|
dfltTotalAnalysisTime = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "min_word_length")) {
|
|
dfltMinimumWordLength = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "between_words_silence")) {
|
|
dfltBetweenWordsSilence = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "maximum_number_of_words")) {
|
|
dfltMaximumNumberOfWords = atoi(var->value);
|
|
} else if (!strcasecmp(var->name, "maximum_word_length")) {
|
|
dfltMaximumWordLength = atoi(var->value);
|
|
|
|
} else {
|
|
ast_log(LOG_WARNING, "%s: Cat:%s. Unknown keyword %s at line %d of amd.conf\n",
|
|
app, cat, var->name, var->lineno);
|
|
}
|
|
var = var->next;
|
|
}
|
|
}
|
|
cat = ast_category_browse(cfg, cat);
|
|
}
|
|
|
|
ast_config_destroy(cfg);
|
|
|
|
ast_verb(3, "AMD defaults: initialSilence [%d] greeting [%d] afterGreetingSilence [%d] "
|
|
"totalAnalysisTime [%d] minimumWordLength [%d] betweenWordsSilence [%d] maximumNumberOfWords [%d] silenceThreshold [%d] maximumWordLength [%d]\n",
|
|
dfltInitialSilence, dfltGreeting, dfltAfterGreetingSilence, dfltTotalAnalysisTime,
|
|
dfltMinimumWordLength, dfltBetweenWordsSilence, dfltMaximumNumberOfWords, dfltSilenceThreshold, dfltMaximumWordLength);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return ast_unregister_application(app);
|
|
}
|
|
|
|
/*!
|
|
* \brief Load the module
|
|
*
|
|
* Module loading including tests for configuration or dependencies.
|
|
* This function can return AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_DECLINE,
|
|
* or AST_MODULE_LOAD_SUCCESS. If a dependency or environment variable fails
|
|
* tests return AST_MODULE_LOAD_FAILURE. If the module can not load the
|
|
* configuration file or other non-critical problem return
|
|
* AST_MODULE_LOAD_DECLINE. On success return AST_MODULE_LOAD_SUCCESS.
|
|
*/
|
|
static int load_module(void)
|
|
{
|
|
if (load_config(0))
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
if (ast_register_application_xml(app, amd_exec))
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int reload(void)
|
|
{
|
|
if (load_config(1))
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Answering Machine Detection Application",
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.reload = reload,
|
|
);
|