https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r201423 | dvossel | 2009-06-17 14:28:12 -0500 (Wed, 17 Jun 2009) | 19 lines StopMixMonitor race condition (not giving up file immediately) StopMixMonitor only indicates to the MixMonitor thread to stop writing to the file. It does not guarantee that the recording's file handle is available to the dialplan immediately after execution. This results in a race condition. To resolve this, the filestream pointer is placed in a datastore on the channel. When StopMixMonitor is called, the datastore is retrieved from the channel and the filestream is closed immediately before returning to the dialplan. Documentation indicating the use of StopMixMonitor to free files has been updated as well. (closes issue #15259) Reported by: travisghansen Tested by: dvossel Review: https://reviewboard.asterisk.org/r/283/ ........ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@201445 65c4cc65-6c06-0410-ace0-fbb531ad65f3
591 lines
18 KiB
C
591 lines
18 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2005, Anthony Minessale II
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* Copyright (C) 2005 - 2006, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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* Kevin P. Fleming <kpfleming@digium.com>
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*
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* Based on app_muxmon.c provided by
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* Anthony Minessale II <anthmct@yahoo.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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/*! \file
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*
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* \brief MixMonitor() - Record a call and mix the audio during the recording
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* \ingroup applications
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*
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* \author Mark Spencer <markster@digium.com>
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* \author Kevin P. Fleming <kpfleming@digium.com>
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*
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* \note Based on app_muxmon.c provided by
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* Anthony Minessale II <anthmct@yahoo.com>
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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/paths.h" /* use ast_config_AST_MONITOR_DIR */
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#include "asterisk/file.h"
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#include "asterisk/audiohook.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/cli.h"
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#include "asterisk/app.h"
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#include "asterisk/channel.h"
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#include "asterisk/autochan.h"
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/*** DOCUMENTATION
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<application name="MixMonitor" language="en_US">
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<synopsis>
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Record a call and mix the audio during the recording. Use of StopMixMonitor is required
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to guarantee the audio file is available for processing during dialplan execution.
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</synopsis>
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<syntax>
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<parameter name="file" required="true" argsep=".">
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<argument name="filename" required="true">
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<para>If <replaceable>filename</replaceable> is an absolute path, uses that path, otherwise
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creates the file in the configured monitoring directory from <filename>asterisk.conf.</filename></para>
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</argument>
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<argument name="extension" required="true" />
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</parameter>
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<parameter name="options">
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<optionlist>
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<option name="a">
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<para>Append to the file instead of overwriting it.</para>
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</option>
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<option name="b">
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<para>Only save audio to the file while the channel is bridged.</para>
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<note><para>Does not include conferences or sounds played to each bridged party</para></note>
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<note><para>If you utilize this option inside a Local channel, you must make sure the Local
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channel is not optimized away. To do this, be sure to call your Local channel with the
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<literal>/n</literal> option. For example: Dial(Local/start@mycontext/n)</para></note>
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</option>
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<option name="v">
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<para>Adjust the <emphasis>heard</emphasis> volume by a factor of <replaceable>x</replaceable>
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(range <literal>-4</literal> to <literal>4</literal>)</para>
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<argument name="x" required="true" />
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</option>
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<option name="V">
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<para>Adjust the <emphasis>spoken</emphasis> volume by a factor
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of <replaceable>x</replaceable> (range <literal>-4</literal> to <literal>4</literal>)</para>
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<argument name="x" required="true" />
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</option>
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<option name="W">
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<para>Adjust both, <emphasis>heard and spoken</emphasis> volumes by a factor
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of <replaceable>x</replaceable> (range <literal>-4</literal> to <literal>4</literal>)</para>
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<argument name="x" required="true" />
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</option>
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</optionlist>
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</parameter>
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<parameter name="command">
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<para>Will be executed when the recording is over.</para>
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<para>Any strings matching <literal>^{X}</literal> will be unescaped to <variable>X</variable>.</para>
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<para>All variables will be evaluated at the time MixMonitor is called.</para>
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</parameter>
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</syntax>
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<description>
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<para>Records the audio on the current channel to the specified file.</para>
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<variablelist>
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<variable name="MIXMONITOR_FILENAME">
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<para>Will contain the filename used to record.</para>
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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">Monitor</ref>
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<ref type="application">StopMixMonitor</ref>
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<ref type="application">PauseMonitor</ref>
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<ref type="application">UnpauseMonitor</ref>
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</see-also>
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</application>
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<application name="StopMixMonitor" language="en_US">
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<synopsis>
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Stop recording a call through MixMonitor, and free the recording's file handle.
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</synopsis>
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<syntax />
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<description>
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<para>Stops the audio recording that was started with a call to <literal>MixMonitor()</literal>
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on the current channel.</para>
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</description>
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<see-also>
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<ref type="application">MixMonitor</ref>
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</see-also>
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</application>
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***/
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#define get_volfactor(x) x ? ((x > 0) ? (1 << x) : ((1 << abs(x)) * -1)) : 0
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static const char * const app = "MixMonitor";
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static const char * const stop_app = "StopMixMonitor";
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static const char * const mixmonitor_spy_type = "MixMonitor";
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struct mixmonitor {
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struct ast_audiohook audiohook;
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char *filename;
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char *post_process;
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char *name;
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unsigned int flags;
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struct ast_autochan *autochan;
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struct mixmonitor_ds *mixmonitor_ds;
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};
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enum mixmonitor_flags {
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MUXFLAG_APPEND = (1 << 1),
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MUXFLAG_BRIDGED = (1 << 2),
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MUXFLAG_VOLUME = (1 << 3),
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MUXFLAG_READVOLUME = (1 << 4),
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MUXFLAG_WRITEVOLUME = (1 << 5),
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};
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enum mixmonitor_args {
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OPT_ARG_READVOLUME = 0,
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OPT_ARG_WRITEVOLUME,
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OPT_ARG_VOLUME,
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OPT_ARG_ARRAY_SIZE,
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};
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AST_APP_OPTIONS(mixmonitor_opts, {
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AST_APP_OPTION('a', MUXFLAG_APPEND),
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AST_APP_OPTION('b', MUXFLAG_BRIDGED),
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AST_APP_OPTION_ARG('v', MUXFLAG_READVOLUME, OPT_ARG_READVOLUME),
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AST_APP_OPTION_ARG('V', MUXFLAG_WRITEVOLUME, OPT_ARG_WRITEVOLUME),
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AST_APP_OPTION_ARG('W', MUXFLAG_VOLUME, OPT_ARG_VOLUME),
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});
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struct mixmonitor_ds {
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unsigned int destruction_ok;
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ast_cond_t destruction_condition;
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ast_mutex_t lock;
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/* The filestream is held in the datastore so it can be stopped
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* immediately during stop_mixmonitor or channel destruction. */
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int fs_quit;
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struct ast_filestream *fs;
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};
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static void mixmonitor_ds_close_fs(struct mixmonitor_ds *mixmonitor_ds)
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{
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ast_mutex_lock(&mixmonitor_ds->lock);
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if (mixmonitor_ds->fs) {
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ast_closestream(mixmonitor_ds->fs);
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mixmonitor_ds->fs = NULL;
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mixmonitor_ds->fs_quit = 1;
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ast_verb(2, "MixMonitor close filestream\n");
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}
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ast_mutex_unlock(&mixmonitor_ds->lock);
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}
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static void mixmonitor_ds_destroy(void *data)
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{
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struct mixmonitor_ds *mixmonitor_ds = data;
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ast_mutex_lock(&mixmonitor_ds->lock);
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mixmonitor_ds->destruction_ok = 1;
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ast_cond_signal(&mixmonitor_ds->destruction_condition);
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ast_mutex_unlock(&mixmonitor_ds->lock);
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}
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static struct ast_datastore_info mixmonitor_ds_info = {
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.type = "mixmonitor",
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.destroy = mixmonitor_ds_destroy,
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};
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static int startmon(struct ast_channel *chan, struct ast_audiohook *audiohook)
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{
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struct ast_channel *peer = NULL;
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int res = 0;
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if (!chan)
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return -1;
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ast_audiohook_attach(chan, audiohook);
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if (!res && ast_test_flag(chan, AST_FLAG_NBRIDGE) && (peer = ast_bridged_channel(chan)))
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ast_softhangup(peer, AST_SOFTHANGUP_UNBRIDGE);
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return res;
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}
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#define SAMPLES_PER_FRAME 160
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static void mixmonitor_free(struct mixmonitor *mixmonitor)
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{
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if (mixmonitor) {
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if (mixmonitor->mixmonitor_ds) {
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ast_mutex_destroy(&mixmonitor->mixmonitor_ds->lock);
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ast_cond_destroy(&mixmonitor->mixmonitor_ds->destruction_condition);
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ast_free(mixmonitor->mixmonitor_ds);
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}
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ast_free(mixmonitor);
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}
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}
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static void *mixmonitor_thread(void *obj)
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{
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struct mixmonitor *mixmonitor = obj;
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struct ast_filestream **fs = NULL;
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unsigned int oflags;
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char *ext;
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int errflag = 0;
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ast_verb(2, "Begin MixMonitor Recording %s\n", mixmonitor->name);
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ast_audiohook_lock(&mixmonitor->audiohook);
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fs = &mixmonitor->mixmonitor_ds->fs;
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while (mixmonitor->audiohook.status == AST_AUDIOHOOK_STATUS_RUNNING && !mixmonitor->mixmonitor_ds->fs_quit) {
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struct ast_frame *fr = NULL;
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ast_audiohook_trigger_wait(&mixmonitor->audiohook);
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if (mixmonitor->audiohook.status != AST_AUDIOHOOK_STATUS_RUNNING)
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break;
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if (!(fr = ast_audiohook_read_frame(&mixmonitor->audiohook, SAMPLES_PER_FRAME, AST_AUDIOHOOK_DIRECTION_BOTH, AST_FORMAT_SLINEAR)))
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continue;
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if (!ast_test_flag(mixmonitor, MUXFLAG_BRIDGED) || (mixmonitor->autochan->chan && ast_bridged_channel(mixmonitor->autochan->chan))) {
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ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);
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/* Initialize the file if not already done so */
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if (!*fs && !errflag && !mixmonitor->mixmonitor_ds->fs_quit) {
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oflags = O_CREAT | O_WRONLY;
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oflags |= ast_test_flag(mixmonitor, MUXFLAG_APPEND) ? O_APPEND : O_TRUNC;
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if ((ext = strrchr(mixmonitor->filename, '.')))
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*(ext++) = '\0';
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else
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ext = "raw";
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if (!(*fs = ast_writefile(mixmonitor->filename, ext, NULL, oflags, 0, 0666))) {
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ast_log(LOG_ERROR, "Cannot open %s.%s\n", mixmonitor->filename, ext);
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errflag = 1;
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}
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}
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/* Write out the frame(s) */
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if (*fs) {
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struct ast_frame *cur;
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for (cur = fr; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
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ast_writestream(*fs, cur);
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}
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}
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ast_mutex_unlock(&mixmonitor->mixmonitor_ds->lock);
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}
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/* All done! free it. */
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ast_frame_free(fr, 0);
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}
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ast_audiohook_detach(&mixmonitor->audiohook);
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ast_audiohook_unlock(&mixmonitor->audiohook);
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ast_audiohook_destroy(&mixmonitor->audiohook);
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mixmonitor_ds_close_fs(mixmonitor->mixmonitor_ds);
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if (mixmonitor->post_process) {
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ast_verb(2, "Executing [%s]\n", mixmonitor->post_process);
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ast_safe_system(mixmonitor->post_process);
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}
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ast_autochan_destroy(mixmonitor->autochan);
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ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);
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if (!mixmonitor->mixmonitor_ds->destruction_ok) {
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ast_cond_wait(&mixmonitor->mixmonitor_ds->destruction_condition, &mixmonitor->mixmonitor_ds->lock);
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}
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ast_mutex_unlock(&mixmonitor->mixmonitor_ds->lock);
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ast_verb(2, "End MixMonitor Recording %s\n", mixmonitor->name);
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mixmonitor_free(mixmonitor);
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return NULL;
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}
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static int setup_mixmonitor_ds(struct mixmonitor *mixmonitor, struct ast_channel *chan)
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{
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struct ast_datastore *datastore = NULL;
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struct mixmonitor_ds *mixmonitor_ds;
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if (!(mixmonitor_ds = ast_calloc(1, sizeof(*mixmonitor_ds)))) {
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return -1;
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}
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ast_mutex_init(&mixmonitor_ds->lock);
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ast_cond_init(&mixmonitor_ds->destruction_condition, NULL);
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if (!(datastore = ast_datastore_alloc(&mixmonitor_ds_info, NULL))) {
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ast_mutex_destroy(&mixmonitor_ds->lock);
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ast_cond_destroy(&mixmonitor_ds->destruction_condition);
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ast_free(mixmonitor_ds);
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return -1;
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}
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datastore->data = mixmonitor_ds;
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ast_channel_lock(chan);
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ast_channel_datastore_add(chan, datastore);
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ast_channel_unlock(chan);
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mixmonitor->mixmonitor_ds = mixmonitor_ds;
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return 0;
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}
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static void launch_monitor_thread(struct ast_channel *chan, const char *filename, unsigned int flags,
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int readvol, int writevol, const char *post_process)
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{
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pthread_t thread;
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struct mixmonitor *mixmonitor;
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char postprocess2[1024] = "";
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size_t len;
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len = sizeof(*mixmonitor) + strlen(chan->name) + strlen(filename) + 2;
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postprocess2[0] = 0;
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/* If a post process system command is given attach it to the structure */
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if (!ast_strlen_zero(post_process)) {
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char *p1, *p2;
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p1 = ast_strdupa(post_process);
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for (p2 = p1; *p2 ; p2++) {
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if (*p2 == '^' && *(p2+1) == '{') {
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*p2 = '$';
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}
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}
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pbx_substitute_variables_helper(chan, p1, postprocess2, sizeof(postprocess2) - 1);
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if (!ast_strlen_zero(postprocess2))
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len += strlen(postprocess2) + 1;
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}
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/* Pre-allocate mixmonitor structure and spy */
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if (!(mixmonitor = ast_calloc(1, len))) {
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return;
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}
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/* Copy over flags and channel name */
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mixmonitor->flags = flags;
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if (!(mixmonitor->autochan = ast_autochan_setup(chan))) {
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mixmonitor_free(mixmonitor);
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return;
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}
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if (setup_mixmonitor_ds(mixmonitor, chan)) {
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ast_autochan_destroy(mixmonitor->autochan);
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mixmonitor_free(mixmonitor);
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return;
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}
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mixmonitor->name = (char *) mixmonitor + sizeof(*mixmonitor);
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strcpy(mixmonitor->name, chan->name);
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if (!ast_strlen_zero(postprocess2)) {
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mixmonitor->post_process = mixmonitor->name + strlen(mixmonitor->name) + strlen(filename) + 2;
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strcpy(mixmonitor->post_process, postprocess2);
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}
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mixmonitor->filename = (char *) mixmonitor + sizeof(*mixmonitor) + strlen(chan->name) + 1;
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strcpy(mixmonitor->filename, filename);
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/* Setup the actual spy before creating our thread */
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if (ast_audiohook_init(&mixmonitor->audiohook, AST_AUDIOHOOK_TYPE_SPY, mixmonitor_spy_type)) {
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ast_free(mixmonitor);
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return;
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}
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ast_set_flag(&mixmonitor->audiohook, AST_AUDIOHOOK_TRIGGER_SYNC);
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if (readvol)
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mixmonitor->audiohook.options.read_volume = readvol;
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if (writevol)
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mixmonitor->audiohook.options.write_volume = writevol;
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if (startmon(chan, &mixmonitor->audiohook)) {
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ast_log(LOG_WARNING, "Unable to add '%s' spy to channel '%s'\n",
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mixmonitor_spy_type, chan->name);
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ast_audiohook_destroy(&mixmonitor->audiohook);
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ast_free(mixmonitor);
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return;
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}
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ast_pthread_create_detached_background(&thread, NULL, mixmonitor_thread, mixmonitor);
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}
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static int mixmonitor_exec(struct ast_channel *chan, const char *data)
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{
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int x, readvol = 0, writevol = 0;
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struct ast_flags flags = {0};
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char *parse, *tmp, *slash;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(filename);
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AST_APP_ARG(options);
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AST_APP_ARG(post_process);
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);
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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "MixMonitor requires an argument (filename)\n");
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return -1;
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}
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parse = ast_strdupa(data);
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AST_STANDARD_APP_ARGS(args, parse);
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if (ast_strlen_zero(args.filename)) {
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ast_log(LOG_WARNING, "MixMonitor requires an argument (filename)\n");
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return -1;
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}
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if (args.options) {
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char *opts[OPT_ARG_ARRAY_SIZE] = { NULL, };
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ast_app_parse_options(mixmonitor_opts, &flags, opts, args.options);
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if (ast_test_flag(&flags, MUXFLAG_READVOLUME)) {
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if (ast_strlen_zero(opts[OPT_ARG_READVOLUME])) {
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ast_log(LOG_WARNING, "No volume level was provided for the heard volume ('v') option.\n");
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} else if ((sscanf(opts[OPT_ARG_READVOLUME], "%d", &x) != 1) || (x < -4) || (x > 4)) {
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ast_log(LOG_NOTICE, "Heard volume must be a number between -4 and 4, not '%s'\n", opts[OPT_ARG_READVOLUME]);
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} else {
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readvol = get_volfactor(x);
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}
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}
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if (ast_test_flag(&flags, MUXFLAG_WRITEVOLUME)) {
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if (ast_strlen_zero(opts[OPT_ARG_WRITEVOLUME])) {
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ast_log(LOG_WARNING, "No volume level was provided for the spoken volume ('V') option.\n");
|
|
} else if ((sscanf(opts[OPT_ARG_WRITEVOLUME], "%d", &x) != 1) || (x < -4) || (x > 4)) {
|
|
ast_log(LOG_NOTICE, "Spoken volume must be a number between -4 and 4, not '%s'\n", opts[OPT_ARG_WRITEVOLUME]);
|
|
} else {
|
|
writevol = get_volfactor(x);
|
|
}
|
|
}
|
|
|
|
if (ast_test_flag(&flags, MUXFLAG_VOLUME)) {
|
|
if (ast_strlen_zero(opts[OPT_ARG_VOLUME])) {
|
|
ast_log(LOG_WARNING, "No volume level was provided for the combined volume ('W') option.\n");
|
|
} else if ((sscanf(opts[OPT_ARG_VOLUME], "%d", &x) != 1) || (x < -4) || (x > 4)) {
|
|
ast_log(LOG_NOTICE, "Combined volume must be a number between -4 and 4, not '%s'\n", opts[OPT_ARG_VOLUME]);
|
|
} else {
|
|
readvol = writevol = get_volfactor(x);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* if not provided an absolute path, use the system-configured monitoring directory */
|
|
if (args.filename[0] != '/') {
|
|
char *build;
|
|
|
|
build = alloca(strlen(ast_config_AST_MONITOR_DIR) + strlen(args.filename) + 3);
|
|
sprintf(build, "%s/%s", ast_config_AST_MONITOR_DIR, args.filename);
|
|
args.filename = build;
|
|
}
|
|
|
|
tmp = ast_strdupa(args.filename);
|
|
if ((slash = strrchr(tmp, '/')))
|
|
*slash = '\0';
|
|
ast_mkdir(tmp, 0777);
|
|
|
|
pbx_builtin_setvar_helper(chan, "MIXMONITOR_FILENAME", args.filename);
|
|
launch_monitor_thread(chan, args.filename, flags.flags, readvol, writevol, args.post_process);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stop_mixmonitor_exec(struct ast_channel *chan, const char *data)
|
|
{
|
|
struct ast_datastore *datastore = NULL;
|
|
|
|
/* closing the filestream here guarantees the file is avaliable to the dialplan
|
|
* after calling StopMixMonitor */
|
|
if ((datastore = ast_channel_datastore_find(chan, &mixmonitor_ds_info, NULL))) {
|
|
mixmonitor_ds_close_fs(datastore->data);
|
|
}
|
|
|
|
ast_audiohook_detach_source(chan, mixmonitor_spy_type);
|
|
return 0;
|
|
}
|
|
|
|
static char *handle_cli_mixmonitor(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
|
|
{
|
|
struct ast_channel *chan;
|
|
|
|
switch (cmd) {
|
|
case CLI_INIT:
|
|
e->command = "mixmonitor {start|stop} {<chan_name>} [args]";
|
|
e->usage =
|
|
"Usage: mixmonitor <start|stop> <chan_name> [args]\n"
|
|
" The optional arguments are passed to the MixMonitor\n"
|
|
" application when the 'start' command is used.\n";
|
|
return NULL;
|
|
case CLI_GENERATE:
|
|
return ast_complete_channels(a->line, a->word, a->pos, a->n, 2);
|
|
}
|
|
|
|
if (a->argc < 3)
|
|
return CLI_SHOWUSAGE;
|
|
|
|
if (!(chan = ast_channel_get_by_name_prefix(a->argv[2], strlen(a->argv[2])))) {
|
|
ast_cli(a->fd, "No channel matching '%s' found.\n", a->argv[2]);
|
|
/* Technically this is a failure, but we don't want 2 errors printing out */
|
|
return CLI_SUCCESS;
|
|
}
|
|
|
|
ast_channel_lock(chan);
|
|
|
|
if (!strcasecmp(a->argv[1], "start")) {
|
|
mixmonitor_exec(chan, a->argv[3]);
|
|
ast_channel_unlock(chan);
|
|
} else {
|
|
ast_channel_unlock(chan);
|
|
ast_audiohook_detach_source(chan, mixmonitor_spy_type);
|
|
}
|
|
|
|
chan = ast_channel_unref(chan);
|
|
|
|
return CLI_SUCCESS;
|
|
}
|
|
|
|
static struct ast_cli_entry cli_mixmonitor[] = {
|
|
AST_CLI_DEFINE(handle_cli_mixmonitor, "Execute a MixMonitor command")
|
|
};
|
|
|
|
static int unload_module(void)
|
|
{
|
|
int res;
|
|
|
|
ast_cli_unregister_multiple(cli_mixmonitor, ARRAY_LEN(cli_mixmonitor));
|
|
res = ast_unregister_application(stop_app);
|
|
res |= ast_unregister_application(app);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
int res;
|
|
|
|
ast_cli_register_multiple(cli_mixmonitor, ARRAY_LEN(cli_mixmonitor));
|
|
res = ast_register_application_xml(app, mixmonitor_exec);
|
|
res |= ast_register_application_xml(stop_app, stop_mixmonitor_exec);
|
|
|
|
return res;
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Mixed Audio Monitoring Application");
|