app_mixmonitor.c

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2005, Anthony Minessale II
 * Copyright (C) 2005 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 * Kevin P. Fleming <kpfleming@digium.com>
 *
 * Based on app_muxmon.c provided by
 * Anthony Minessale II <anthmct@yahoo.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief MixMonitor() - Record a call and mix the audio during the recording
 * \ingroup applications
 *
 * \author Mark Spencer <markster@digium.com>
 * \author Kevin P. Fleming <kpfleming@digium.com>
 *
 * \note Based on app_muxmon.c provided by
 * Anthony Minessale II <anthmct@yahoo.com>
 */

/*** MODULEINFO
	<use type="module">func_periodic_hook</use>
	<support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/paths.h"	/* use ast_config_AST_MONITOR_DIR */
#include "asterisk/stringfields.h"
#include "asterisk/file.h"
#include "asterisk/audiohook.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/cli.h"
#include "asterisk/app.h"
#include "asterisk/channel.h"
#include "asterisk/autochan.h"
#include "asterisk/manager.h"
#include "asterisk/callerid.h"
#include "asterisk/mod_format.h"
#include "asterisk/linkedlists.h"
#include "asterisk/test.h"
#include "asterisk/mixmonitor.h"
#include "asterisk/format_cache.h"
#include "asterisk/beep.h"

/*** DOCUMENTATION
	<application name="MixMonitor" language="en_US">
		<synopsis>
			Record a call and mix the audio during the recording.  Use of StopMixMonitor is required
			to guarantee the audio file is available for processing during dialplan execution.
		</synopsis>
		<syntax>
			<parameter name="file" required="true" argsep=".">
				<argument name="filename" required="true">
					<para>If <replaceable>filename</replaceable> is an absolute path, uses that path, otherwise
					creates the file in the configured monitoring directory from <filename>asterisk.conf.</filename></para>
				</argument>
				<argument name="extension" required="true" />
			</parameter>
			<parameter name="options">
				<optionlist>
					<option name="a">
						<para>Append to the file instead of overwriting it.</para>
					</option>
					<option name="b">
						<para>Only save audio to the file while the channel is bridged.</para>
						<note><para>If you utilize this option inside a Local channel, you must make sure the Local
						channel is not optimized away. To do this, be sure to call your Local channel with the
						<literal>/n</literal> option. For example: Dial(Local/start@mycontext/n)</para></note>
					</option>
					<option name="B">
						<para>Play a periodic beep while this call is being recorded.</para>
						<argument name="interval"><para>Interval, in seconds. Default is 15.</para></argument>
					</option>
					<option name="v">
						<para>Adjust the <emphasis>heard</emphasis> volume by a factor of <replaceable>x</replaceable>
						(range <literal>-4</literal> to <literal>4</literal>)</para>
						<argument name="x" required="true" />
					</option>
					<option name="V">
						<para>Adjust the <emphasis>spoken</emphasis> volume by a factor
						of <replaceable>x</replaceable> (range <literal>-4</literal> to <literal>4</literal>)</para>
						<argument name="x" required="true" />
					</option>
					<option name="W">
						<para>Adjust both, <emphasis>heard and spoken</emphasis> volumes by a factor
						of <replaceable>x</replaceable> (range <literal>-4</literal> to <literal>4</literal>)</para>
						<argument name="x" required="true" />
					</option>
					<option name="r">
						<argument name="file" required="true" />
						<para>Use the specified file to record the <emphasis>receive</emphasis> audio feed.
						Like with the basic filename argument, if an absolute path isn't given, it will create
						the file in the configured monitoring directory.</para>
					</option>
					<option name="t">
						<argument name="file" required="true" />
						<para>Use the specified file to record the <emphasis>transmit</emphasis> audio feed.
						Like with the basic filename argument, if an absolute path isn't given, it will create
						the file in the configured monitoring directory.</para>
					</option>
					<option name="n">
						<para>When the <replaceable>r</replaceable> or <replaceable>t</replaceable> option is
						used, MixMonitor will insert silence into the specified files to maintain
						synchronization between them. Use this option to disable that behavior.</para>
					</option>
					<option name="i">
						<argument name="chanvar" required="true" />
						<para>Stores the MixMonitor's ID on this channel variable.</para>
					</option>
					<option name="p">
						<para>Play a beep on the channel that starts the recording.</para>
					</option>
					<option name="P">
						<para>Play a beep on the channel that stops the recording.</para>
					</option>
					<option name="m">
						<argument name="mailbox" required="true" />
						<para>Create a copy of the recording as a voicemail in the indicated <emphasis>mailbox</emphasis>(es)
						separated by commas eg. m(1111@default,2222@default,...).  Folders can be optionally specified using
						the syntax: mailbox@context/folder</para>
					</option>
				</optionlist>
			</parameter>
			<parameter name="command">
				<para>Will be executed when the recording is over.</para>
				<para>Any strings matching <literal>^{X}</literal> will be unescaped to <variable>X</variable>.</para>
				<para>All variables will be evaluated at the time MixMonitor is called.</para>
				<warning><para>Do not use untrusted strings such as <variable>CALLERID(num)</variable>
				or <variable>CALLERID(name)</variable> as part of the command parameters.  You
				risk a command injection attack executing arbitrary commands if the untrusted
				strings aren't filtered to remove dangerous characters.  See function
				<variable>FILTER()</variable>.</para></warning>
			</parameter>
		</syntax>
		<description>
			<para>Records the audio on the current channel to the specified file.</para>
			<para>This application does not automatically answer and should be preceeded by
			an application such as Answer or Progress().</para>
			<note><para>MixMonitor runs as an audiohook.</para></note>
			<note><para>If a filename passed to MixMonitor ends with
			<literal>.wav49</literal>, Asterisk will silently convert the extension to
			<literal>.WAV</literal> for legacy reasons. <variable>MIXMONITOR_FILENAME</variable>
			will contain the actual filename that Asterisk is writing to, not necessarily the
			value that was passed in.</para></note>
			<variablelist>
				<variable name="MIXMONITOR_FILENAME">
					<para>Will contain the filename used to record.</para>
				</variable>
			</variablelist>
			<warning><para>Do not use untrusted strings such as <variable>CALLERID(num)</variable>
			or <variable>CALLERID(name)</variable> as part of ANY of the application's
			parameters.  You risk a command injection attack executing arbitrary commands
			if the untrusted strings aren't filtered to remove dangerous characters.  See
			function <variable>FILTER()</variable>.</para></warning>
		</description>
		<see-also>
			<ref type="application">Monitor</ref>
			<ref type="application">StopMixMonitor</ref>
			<ref type="application">PauseMonitor</ref>
			<ref type="application">UnpauseMonitor</ref>
			<ref type="function">AUDIOHOOK_INHERIT</ref>
		</see-also>
	</application>
	<application name="StopMixMonitor" language="en_US">
		<synopsis>
			Stop recording a call through MixMonitor, and free the recording's file handle.
		</synopsis>
		<syntax>
			<parameter name="MixMonitorID" required="false">
				<para>If a valid ID is provided, then this command will stop only that specific
				MixMonitor.</para>
			</parameter>
		</syntax>
		<description>
			<para>Stops the audio recording that was started with a call to <literal>MixMonitor()</literal>
			on the current channel.</para>
		</description>
		<see-also>
			<ref type="application">MixMonitor</ref>
		</see-also>
	</application>
	<manager name="MixMonitorMute" language="en_US">
		<synopsis>
			Mute / unMute a Mixmonitor recording.
		</synopsis>
		<syntax>
			<xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
			<parameter name="Channel" required="true">
				<para>Used to specify the channel to mute.</para>
			</parameter>
			<parameter name="Direction">
				<para>Which part of the recording to mute:  read, write or both (from channel, to channel or both channels).</para>
			</parameter>
			<parameter name="State">
				<para>Turn mute on or off : 1 to turn on, 0 to turn off.</para>
			</parameter>
		</syntax>
		<description>
			<para>This action may be used to mute a MixMonitor recording.</para>
		</description>
	</manager>
	<manager name="MixMonitor" language="en_US">
		<synopsis>
			Record a call and mix the audio during the recording.  Use of StopMixMonitor is required
			to guarantee the audio file is available for processing during dialplan execution.
		</synopsis>
		<syntax>
			<xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
			<parameter name="Channel" required="true">
				<para>Used to specify the channel to record.</para>
			</parameter>
			<parameter name="File">
				<para>Is the name of the file created in the monitor spool directory.
				Defaults to the same name as the channel (with slashes replaced with dashes).
				This argument is optional if you specify to record unidirectional audio with
				either the r(filename) or t(filename) options in the options field. If
				neither MIXMONITOR_FILENAME or this parameter is set, the mixed stream won't
				be recorded.</para>
			</parameter>
			<parameter name="options">
				<para>Options that apply to the MixMonitor in the same way as they
				would apply if invoked from the MixMonitor application. For a list of
				available options, see the documentation for the mixmonitor application. </para>
			</parameter>
			<parameter name="Command">
				<para>Will be executed when the recording is over.
				Any strings matching <literal>^{X}</literal> will be unescaped to <variable>X</variable>.
				All variables will be evaluated at the time MixMonitor is called.</para>
				<warning><para>Do not use untrusted strings such as <variable>CALLERID(num)</variable>
				or <variable>CALLERID(name)</variable> as part of the command parameters.  You
				risk a command injection attack executing arbitrary commands if the untrusted
				strings aren't filtered to remove dangerous characters.  See function
				<variable>FILTER()</variable>.</para></warning>
			</parameter>
		</syntax>
		<description>
			<para>This action records the audio on the current channel to the specified file.</para>
			<variablelist>
				<variable name="MIXMONITOR_FILENAME">
					<para>Will contain the filename used to record the mixed stream.</para>
				</variable>
			</variablelist>
		</description>
	</manager>
	<manager name="StopMixMonitor" language="en_US">
		<synopsis>
			Stop recording a call through MixMonitor, and free the recording's file handle.
		</synopsis>
		<syntax>
			<xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
			<parameter name="Channel" required="true">
				<para>The name of the channel monitored.</para>
			</parameter>
			<parameter name="MixMonitorID" required="false">
				<para>If a valid ID is provided, then this command will stop only that specific
				MixMonitor.</para>
			</parameter>
		</syntax>
		<description>
			<para>This action stops the audio recording that was started with the <literal>MixMonitor</literal>
			action on the current channel.</para>
		</description>
	</manager>
	<function name="MIXMONITOR" language="en_US">
		<synopsis>
			Retrieve data pertaining to specific instances of MixMonitor on a channel.
		</synopsis>
		<syntax>
			<parameter name="id" required="true">
				<para>The unique ID of the MixMonitor instance. The unique ID can be retrieved through the channel
				variable used as an argument to the <replaceable>i</replaceable> option to MixMonitor.</para>
			</parameter>
			<parameter name="key" required="true">
				<para>The piece of data to retrieve from the MixMonitor.</para>
				<enumlist>
					<enum name="filename" />
				</enumlist>
			</parameter>
		</syntax>
	</function>

 ***/

#define get_volfactor(x) x ? ((x > 0) ? (1 << x) : ((1 << abs(x)) * -1)) : 0

static const char * const app = "MixMonitor";

static const char * const stop_app = "StopMixMonitor";

static const char * const mixmonitor_spy_type = "MixMonitor";

/*!
 * \internal
 * \brief This struct is a list item holds data needed to find a vm_recipient within voicemail
 */
struct vm_recipient {
	char mailbox[AST_MAX_CONTEXT];
	char context[AST_MAX_EXTENSION];
	char folder[80];
	AST_LIST_ENTRY(vm_recipient) list;
};

struct mixmonitor {
	struct ast_audiohook audiohook;
	char *filename;
	char *filename_read;
	char *filename_write;
	char *post_process;
	char *name;
	ast_callid callid;
	unsigned int flags;
	struct ast_autochan *autochan;
	struct mixmonitor_ds *mixmonitor_ds;

	/* the below string fields describe data used for creating voicemails from the recording */
	AST_DECLARE_STRING_FIELDS(
		AST_STRING_FIELD(call_context);
		AST_STRING_FIELD(call_macrocontext);
		AST_STRING_FIELD(call_extension);
		AST_STRING_FIELD(call_callerchan);
		AST_STRING_FIELD(call_callerid);
	);
	int call_priority;

	/* FUTURE DEVELOPMENT NOTICE
	 * recipient_list will need locks if we make it editable after the monitor is started */
	AST_LIST_HEAD_NOLOCK(, vm_recipient) recipient_list;
};

enum mixmonitor_flags {
	MUXFLAG_APPEND = (1 << 1),
	MUXFLAG_BRIDGED = (1 << 2),
	MUXFLAG_VOLUME = (1 << 3),
	MUXFLAG_READVOLUME = (1 << 4),
	MUXFLAG_WRITEVOLUME = (1 << 5),
	MUXFLAG_READ = (1 << 6),
	MUXFLAG_WRITE = (1 << 7),
	MUXFLAG_COMBINED = (1 << 8),
	MUXFLAG_UID = (1 << 9),
	MUXFLAG_VMRECIPIENTS = (1 << 10),
	MUXFLAG_BEEP = (1 << 11),
	MUXFLAG_BEEP_START = (1 << 12),
	MUXFLAG_BEEP_STOP = (1 << 13),
	MUXFLAG_DEPRECATED_RWSYNC = (1 << 14),
	MUXFLAG_NO_RWSYNC = (1 << 15),
};

enum mixmonitor_args {
	OPT_ARG_READVOLUME = 0,
	OPT_ARG_WRITEVOLUME,
	OPT_ARG_VOLUME,
	OPT_ARG_WRITENAME,
	OPT_ARG_READNAME,
	OPT_ARG_UID,
	OPT_ARG_VMRECIPIENTS,
	OPT_ARG_BEEP_INTERVAL,
	OPT_ARG_DEPRECATED_RWSYNC,
	OPT_ARG_NO_RWSYNC,
	OPT_ARG_ARRAY_SIZE,	/* Always last element of the enum */
};

AST_APP_OPTIONS(mixmonitor_opts, {
	AST_APP_OPTION('a', MUXFLAG_APPEND),
	AST_APP_OPTION('b', MUXFLAG_BRIDGED),
	AST_APP_OPTION_ARG('B', MUXFLAG_BEEP, OPT_ARG_BEEP_INTERVAL),
	AST_APP_OPTION('p', MUXFLAG_BEEP_START),
	AST_APP_OPTION('P', MUXFLAG_BEEP_STOP),
	AST_APP_OPTION_ARG('v', MUXFLAG_READVOLUME, OPT_ARG_READVOLUME),
	AST_APP_OPTION_ARG('V', MUXFLAG_WRITEVOLUME, OPT_ARG_WRITEVOLUME),
	AST_APP_OPTION_ARG('W', MUXFLAG_VOLUME, OPT_ARG_VOLUME),
	AST_APP_OPTION_ARG('r', MUXFLAG_READ, OPT_ARG_READNAME),
	AST_APP_OPTION_ARG('t', MUXFLAG_WRITE, OPT_ARG_WRITENAME),
	AST_APP_OPTION_ARG('i', MUXFLAG_UID, OPT_ARG_UID),
	AST_APP_OPTION_ARG('m', MUXFLAG_VMRECIPIENTS, OPT_ARG_VMRECIPIENTS),
	AST_APP_OPTION_ARG('S', MUXFLAG_DEPRECATED_RWSYNC, OPT_ARG_DEPRECATED_RWSYNC),
	AST_APP_OPTION_ARG('n', MUXFLAG_NO_RWSYNC, OPT_ARG_NO_RWSYNC),
});

struct mixmonitor_ds {
	unsigned int destruction_ok;
	ast_cond_t destruction_condition;
	ast_mutex_t lock;

	/* The filestream is held in the datastore so it can be stopped
	 * immediately during stop_mixmonitor or channel destruction. */
	int fs_quit;

	struct ast_filestream *fs;
	struct ast_filestream *fs_read;
	struct ast_filestream *fs_write;

	struct ast_audiohook *audiohook;

	unsigned int samp_rate;
	char *filename;
	char *beep_id;
};

/*!
 * \internal
 * \pre mixmonitor_ds must be locked before calling this function
 */
static void mixmonitor_ds_close_fs(struct mixmonitor_ds *mixmonitor_ds)
{
	unsigned char quitting = 0;

	if (mixmonitor_ds->fs) {
		quitting = 1;
		ast_closestream(mixmonitor_ds->fs);
		mixmonitor_ds->fs = NULL;
		ast_verb(2, "MixMonitor close filestream (mixed)\n");
	}

	if (mixmonitor_ds->fs_read) {
		quitting = 1;
		ast_closestream(mixmonitor_ds->fs_read);
		mixmonitor_ds->fs_read = NULL;
		ast_verb(2, "MixMonitor close filestream (read)\n");
	}

	if (mixmonitor_ds->fs_write) {
		quitting = 1;
		ast_closestream(mixmonitor_ds->fs_write);
		mixmonitor_ds->fs_write = NULL;
		ast_verb(2, "MixMonitor close filestream (write)\n");
	}

	if (quitting) {
		mixmonitor_ds->fs_quit = 1;
	}
}

static void mixmonitor_ds_destroy(void *data)
{
	struct mixmonitor_ds *mixmonitor_ds = data;

	ast_mutex_lock(&mixmonitor_ds->lock);
	mixmonitor_ds->audiohook = NULL;
	mixmonitor_ds->destruction_ok = 1;
	ast_free(mixmonitor_ds->filename);
	ast_free(mixmonitor_ds->beep_id);
	ast_cond_signal(&mixmonitor_ds->destruction_condition);
	ast_mutex_unlock(&mixmonitor_ds->lock);
}

static const struct ast_datastore_info mixmonitor_ds_info = {
	.type = "mixmonitor",
	.destroy = mixmonitor_ds_destroy,
};

static void destroy_monitor_audiohook(struct mixmonitor *mixmonitor)
{
	if (mixmonitor->mixmonitor_ds) {
		ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);
		mixmonitor->mixmonitor_ds->audiohook = NULL;
		ast_mutex_unlock(&mixmonitor->mixmonitor_ds->lock);
	}
	/* kill the audiohook.*/
	ast_audiohook_lock(&mixmonitor->audiohook);
	ast_audiohook_detach(&mixmonitor->audiohook);
	ast_audiohook_unlock(&mixmonitor->audiohook);
	ast_audiohook_destroy(&mixmonitor->audiohook);
}

static int startmon(struct ast_channel *chan, struct ast_audiohook *audiohook)
{
	if (!chan) {
		return -1;
	}

	return ast_audiohook_attach(chan, audiohook);
}

/*!
 * \internal
 * \brief adds recipients to a mixmonitor's recipient list
 * \param mixmonitor mixmonitor being affected
 * \param vm_recipients string containing the desired recipients to add
 */
static void add_vm_recipients_from_string(struct mixmonitor *mixmonitor, const char *vm_recipients)
{
	/* recipients are in a single string with a format format resembling "mailbox@context/INBOX,mailbox2@context2,mailbox3@context3/Work" */
	char *cur_mailbox = ast_strdupa(vm_recipients);
	char *cur_context;
	char *cur_folder;
	char *next;
	int elements_processed = 0;

	while (!ast_strlen_zero(cur_mailbox)) {
		ast_debug(3, "attempting to add next element %d from %s\n", elements_processed, cur_mailbox);
		if ((next = strchr(cur_mailbox, ',')) || (next = strchr(cur_mailbox, '&'))) {
			*(next++) = '\0';
		}

		if ((cur_folder = strchr(cur_mailbox, '/'))) {
			*(cur_folder++) = '\0';
		} else {
			cur_folder = "INBOX";
		}

		if ((cur_context = strchr(cur_mailbox, '@'))) {
			*(cur_context++) = '\0';
		} else {
			cur_context = "default";
		}

		if (!ast_strlen_zero(cur_mailbox) && !ast_strlen_zero(cur_context)) {
			struct vm_recipient *recipient;
			if (!(recipient = ast_malloc(sizeof(*recipient)))) {
				ast_log(LOG_ERROR, "Failed to allocate recipient. Aborting function.\n");
				return;
			}
			ast_copy_string(recipient->context, cur_context, sizeof(recipient->context));
			ast_copy_string(recipient->mailbox, cur_mailbox, sizeof(recipient->mailbox));
			ast_copy_string(recipient->folder, cur_folder, sizeof(recipient->folder));

			/* Add to list */
			ast_verb(4, "Adding %s@%s to recipient list\n", recipient->mailbox, recipient->context);
			AST_LIST_INSERT_HEAD(&mixmonitor->recipient_list, recipient, list);
		} else {
			ast_log(LOG_ERROR, "Failed to properly parse extension and/or context from element %d of recipient string: %s\n", elements_processed, vm_recipients);
		}

		cur_mailbox = next;
		elements_processed++;
	}
}

static void clear_mixmonitor_recipient_list(struct mixmonitor *mixmonitor)
{
	struct vm_recipient *current;
	while ((current = AST_LIST_REMOVE_HEAD(&mixmonitor->recipient_list, list))) {
		/* Clear list element data */
		ast_free(current);
	}
}

#define SAMPLES_PER_FRAME 160

static void mixmonitor_free(struct mixmonitor *mixmonitor)
{
	if (mixmonitor) {
		if (mixmonitor->mixmonitor_ds) {
			ast_mutex_destroy(&mixmonitor->mixmonitor_ds->lock);
			ast_cond_destroy(&mixmonitor->mixmonitor_ds->destruction_condition);
			ast_free(mixmonitor->mixmonitor_ds);
		}

		ast_free(mixmonitor->name);
		ast_free(mixmonitor->post_process);
		ast_free(mixmonitor->filename);
		ast_free(mixmonitor->filename_write);
		ast_free(mixmonitor->filename_read);

		/* Free everything in the recipient list */
		clear_mixmonitor_recipient_list(mixmonitor);

		/* clean stringfields */
		ast_string_field_free_memory(mixmonitor);

		ast_free(mixmonitor);
	}
}

/*!
 * \internal
 * \brief Copies the mixmonitor to all voicemail recipients
 * \param mixmonitor The mixmonitor that needs to forward its file to recipients
 * \param ext Format of the file that was saved
 */
static void copy_to_voicemail(struct mixmonitor *mixmonitor, const char *ext, const char *filename)
{
	struct vm_recipient *recipient = NULL;
	struct ast_vm_recording_data recording_data;
	if (ast_string_field_init(&recording_data, 512)) {
		ast_log(LOG_ERROR, "Failed to string_field_init, skipping copy_to_voicemail\n");
		return;
	}

	/* Copy strings to stringfields that will be used for all recipients */
	ast_string_field_set(&recording_data, recording_file, filename);
	ast_string_field_set(&recording_data, recording_ext, ext);
	ast_string_field_set(&recording_data, call_context, mixmonitor->call_context);
	ast_string_field_set(&recording_data, call_macrocontext, mixmonitor->call_macrocontext);
	ast_string_field_set(&recording_data, call_extension, mixmonitor->call_extension);
	ast_string_field_set(&recording_data, call_callerchan, mixmonitor->call_callerchan);
	ast_string_field_set(&recording_data, call_callerid, mixmonitor->call_callerid);
	/* and call_priority gets copied too */
	recording_data.call_priority = mixmonitor->call_priority;

	AST_LIST_TRAVERSE(&mixmonitor->recipient_list, recipient, list) {
		/* context, mailbox, and folder need to be set per recipient */
		ast_string_field_set(&recording_data, context, recipient->context);
		ast_string_field_set(&recording_data, mailbox, recipient->mailbox);
		ast_string_field_set(&recording_data, folder, recipient->folder);

		ast_verb(4, "MixMonitor attempting to send voicemail copy to %s@%s\n", recording_data.mailbox,
			recording_data.context);
		ast_app_copy_recording_to_vm(&recording_data);
	}

	/* Free the string fields for recording_data before exiting the function. */
	ast_string_field_free_memory(&recording_data);
}

static void mixmonitor_save_prep(struct mixmonitor *mixmonitor, char *filename, struct ast_filestream **fs, unsigned int *oflags, int *errflag, char **ext)
{
	/* Initialize the file if not already done so */
	char *last_slash = NULL;
	if (!ast_strlen_zero(filename)) {
		if (!*fs && !*errflag && !mixmonitor->mixmonitor_ds->fs_quit) {
			*oflags = O_CREAT | O_WRONLY;
			*oflags |= ast_test_flag(mixmonitor, MUXFLAG_APPEND) ? O_APPEND : O_TRUNC;

			last_slash = strrchr(filename, '/');

			if ((*ext = strrchr(filename, '.')) && (*ext > last_slash)) {
				**ext = '\0';
				*ext = *ext + 1;
			} else {
				*ext = "raw";
			}

			if (!(*fs = ast_writefile(filename, *ext, NULL, *oflags, 0, 0666))) {
				ast_log(LOG_ERROR, "Cannot open %s.%s\n", filename, *ext);
				*errflag = 1;
			} else {
				struct ast_filestream *tmp = *fs;
				mixmonitor->mixmonitor_ds->samp_rate = MAX(mixmonitor->mixmonitor_ds->samp_rate, ast_format_get_sample_rate(tmp->fmt->format));
			}
		}
	}
}

static int mixmonitor_autochan_is_bridged(struct ast_autochan *autochan)
{
	int is_bridged;

	ast_autochan_channel_lock(autochan);
	is_bridged = ast_channel_is_bridged(autochan->chan);
	ast_autochan_channel_unlock(autochan);
	return is_bridged;
}

static void *mixmonitor_thread(void *obj)
{
	struct mixmonitor *mixmonitor = obj;
	char *fs_ext = "";
	char *fs_read_ext = "";
	char *fs_write_ext = "";

	struct ast_filestream **fs = NULL;
	struct ast_filestream **fs_read = NULL;
	struct ast_filestream **fs_write = NULL;

	unsigned int oflags;
	int errflag = 0;
	struct ast_format *format_slin;

	/* Keep callid association before any log messages */
	if (mixmonitor->callid) {
		ast_callid_threadassoc_add(mixmonitor->callid);
	}

	ast_verb(2, "Begin MixMonitor Recording %s\n", mixmonitor->name);

	fs = &mixmonitor->mixmonitor_ds->fs;
	fs_read = &mixmonitor->mixmonitor_ds->fs_read;
	fs_write = &mixmonitor->mixmonitor_ds->fs_write;

	ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);
	mixmonitor_save_prep(mixmonitor, mixmonitor->filename, fs, &oflags, &errflag, &fs_ext);
	mixmonitor_save_prep(mixmonitor, mixmonitor->filename_read, fs_read, &oflags, &errflag, &fs_read_ext);
	mixmonitor_save_prep(mixmonitor, mixmonitor->filename_write, fs_write, &oflags, &errflag, &fs_write_ext);

	format_slin = ast_format_cache_get_slin_by_rate(mixmonitor->mixmonitor_ds->samp_rate);

	ast_mutex_unlock(&mixmonitor->mixmonitor_ds->lock);

	/* The audiohook must enter and exit the loop locked */
	ast_audiohook_lock(&mixmonitor->audiohook);
	while (mixmonitor->audiohook.status == AST_AUDIOHOOK_STATUS_RUNNING && !mixmonitor->mixmonitor_ds->fs_quit) {
		struct ast_frame *fr = NULL;
		struct ast_frame *fr_read = NULL;
		struct ast_frame *fr_write = NULL;

		if (!(fr = ast_audiohook_read_frame_all(&mixmonitor->audiohook, SAMPLES_PER_FRAME, format_slin,
						&fr_read, &fr_write))) {
			ast_audiohook_trigger_wait(&mixmonitor->audiohook);

			if (mixmonitor->audiohook.status != AST_AUDIOHOOK_STATUS_RUNNING) {
				break;
			}
			continue;
		}

		/* audiohook lock is not required for the next block.
		 * Unlock it, but remember to lock it before looping or exiting */
		ast_audiohook_unlock(&mixmonitor->audiohook);

		if (!ast_test_flag(mixmonitor, MUXFLAG_BRIDGED)
			|| mixmonitor_autochan_is_bridged(mixmonitor->autochan)) {
			ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);

			/* Write out the frame(s) */
			if ((*fs_read) && (fr_read)) {
				struct ast_frame *cur;

				for (cur = fr_read; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
					ast_writestream(*fs_read, cur);
				}
			}

			if ((*fs_write) && (fr_write)) {
				struct ast_frame *cur;

				for (cur = fr_write; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
					ast_writestream(*fs_write, cur);
				}
			}

			if ((*fs) && (fr)) {
				struct ast_frame *cur;

				for (cur = fr; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
					ast_writestream(*fs, cur);
				}
			}
			ast_mutex_unlock(&mixmonitor->mixmonitor_ds->lock);
		}
		/* All done! free it. */
		if (fr) {
			ast_frame_free(fr, 0);
		}
		if (fr_read) {
			ast_frame_free(fr_read, 0);
		}
		if (fr_write) {
			ast_frame_free(fr_write, 0);
		}

		fr = NULL;
		fr_write = NULL;
		fr_read = NULL;

		ast_audiohook_lock(&mixmonitor->audiohook);
	}

	ast_audiohook_unlock(&mixmonitor->audiohook);

	if (ast_test_flag(mixmonitor, MUXFLAG_BEEP_STOP)) {
		ast_autochan_channel_lock(mixmonitor->autochan);
		ast_stream_and_wait(mixmonitor->autochan->chan, "beep", "");
		ast_autochan_channel_unlock(mixmonitor->autochan);
	}

	ast_autochan_destroy(mixmonitor->autochan);

	/* Datastore cleanup.  close the filestream and wait for ds destruction */
	ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);
	mixmonitor_ds_close_fs(mixmonitor->mixmonitor_ds);
	if (!mixmonitor->mixmonitor_ds->destruction_ok) {
		ast_cond_wait(&mixmonitor->mixmonitor_ds->destruction_condition, &mixmonitor->mixmonitor_ds->lock);
	}
	ast_mutex_unlock(&mixmonitor->mixmonitor_ds->lock);

	/* kill the audiohook */
	destroy_monitor_audiohook(mixmonitor);

	if (mixmonitor->post_process) {
		ast_verb(2, "Executing [%s]\n", mixmonitor->post_process);
		ast_safe_system(mixmonitor->post_process);
	}

	ast_verb(2, "End MixMonitor Recording %s\n", mixmonitor->name);
	ast_test_suite_event_notify("MIXMONITOR_END", "File: %s\r\n", mixmonitor->filename);

	if (!AST_LIST_EMPTY(&mixmonitor->recipient_list)) {
		if (ast_strlen_zero(fs_ext)) {
			ast_log(LOG_ERROR, "No file extension set for Mixmonitor %s. Skipping copy to voicemail.\n",
				mixmonitor -> name);
		} else {
			ast_verb(3, "Copying recordings for Mixmonitor %s to voicemail recipients\n", mixmonitor->name);
			copy_to_voicemail(mixmonitor, fs_ext, mixmonitor->filename);
		}
		if (!ast_strlen_zero(fs_read_ext)) {
			ast_verb(3, "Copying read recording for Mixmonitor %s to voicemail recipients\n", mixmonitor->name);
			copy_to_voicemail(mixmonitor, fs_read_ext, mixmonitor->filename_read);
		}
		if (!ast_strlen_zero(fs_write_ext)) {
			ast_verb(3, "Copying write recording for Mixmonitor %s to voicemail recipients\n", mixmonitor->name);
			copy_to_voicemail(mixmonitor, fs_write_ext, mixmonitor->filename_write);
		}
	} else {
		ast_debug(3, "No recipients to forward monitor to, moving on.\n");
	}

	mixmonitor_free(mixmonitor);

	ast_module_unref(ast_module_info->self);
	return NULL;
}

static int setup_mixmonitor_ds(struct mixmonitor *mixmonitor, struct ast_channel *chan, char **datastore_id, const char *beep_id)
{
	struct ast_datastore *datastore = NULL;
	struct mixmonitor_ds *mixmonitor_ds;

	if (!(mixmonitor_ds = ast_calloc(1, sizeof(*mixmonitor_ds)))) {
		return -1;
	}

	if (ast_asprintf(datastore_id, "%p", mixmonitor_ds) == -1) {
		ast_log(LOG_ERROR, "Failed to allocate memory for MixMonitor ID.\n");
		ast_free(mixmonitor_ds);
		return -1;
	}

	ast_mutex_init(&mixmonitor_ds->lock);
	ast_cond_init(&mixmonitor_ds->destruction_condition, NULL);

	if (!(datastore = ast_datastore_alloc(&mixmonitor_ds_info, *datastore_id))) {
		ast_mutex_destroy(&mixmonitor_ds->lock);
		ast_cond_destroy(&mixmonitor_ds->destruction_condition);
		ast_free(mixmonitor_ds);
		return -1;
	}

	if (ast_test_flag(mixmonitor, MUXFLAG_BEEP_START)) {
		ast_autochan_channel_lock(mixmonitor->autochan);
		ast_stream_and_wait(mixmonitor->autochan->chan, "beep", "");
		ast_autochan_channel_unlock(mixmonitor->autochan);
	}

	mixmonitor_ds->samp_rate = 8000;
	mixmonitor_ds->audiohook = &mixmonitor->audiohook;
	mixmonitor_ds->filename = ast_strdup(mixmonitor->filename);
	if (!ast_strlen_zero(beep_id)) {
		mixmonitor_ds->beep_id = ast_strdup(beep_id);
	}
	datastore->data = mixmonitor_ds;

	ast_channel_lock(chan);
	ast_channel_datastore_add(chan, datastore);
	ast_channel_unlock(chan);

	mixmonitor->mixmonitor_ds = mixmonitor_ds;
	return 0;
}

static int launch_monitor_thread(struct ast_channel *chan, const char *filename,
				  unsigned int flags, int readvol, int writevol,
				  const char *post_process, const char *filename_write,
				  char *filename_read, const char *uid_channel_var,
				  const char *recipients, const char *beep_id)
{
	pthread_t thread;
	struct mixmonitor *mixmonitor;
	char postprocess2[1024] = "";
	char *datastore_id = NULL;

	postprocess2[0] = 0;
	/* If a post process system command is given attach it to the structure */
	if (!ast_strlen_zero(post_process)) {
		char *p1, *p2;

		p1 = ast_strdupa(post_process);
		for (p2 = p1; *p2; p2++) {
			if (*p2 == '^' && *(p2+1) == '{') {
				*p2 = '$';
			}
		}
		ast_channel_lock(chan);
		pbx_substitute_variables_helper(chan, p1, postprocess2, sizeof(postprocess2) - 1);
		ast_channel_unlock(chan);
	}

	/* Pre-allocate mixmonitor structure and spy */
	if (!(mixmonitor = ast_calloc(1, sizeof(*mixmonitor)))) {
		return -1;
	}

	/* Now that the struct has been calloced, go ahead and initialize the string fields. */
	if (ast_string_field_init(mixmonitor, 512)) {
		mixmonitor_free(mixmonitor);
		return -1;
	}

	/* Setup the actual spy before creating our thread */
	if (ast_audiohook_init(&mixmonitor->audiohook, AST_AUDIOHOOK_TYPE_SPY, mixmonitor_spy_type, 0)) {
		mixmonitor_free(mixmonitor);
		return -1;
	}

	/* Copy over flags and channel name */
	mixmonitor->flags = flags;
	if (!(mixmonitor->autochan = ast_autochan_setup(chan))) {
		mixmonitor_free(mixmonitor);
		return -1;
	}

	if (!ast_strlen_zero(filename)) {
		mixmonitor->filename = ast_strdup(filename);
	}

	if (!ast_strlen_zero(filename_write)) {
		mixmonitor->filename_write = ast_strdup(filename_write);
	}

	if (!ast_strlen_zero(filename_read)) {
		mixmonitor->filename_read = ast_strdup(filename_read);
	}

	if (setup_mixmonitor_ds(mixmonitor, chan, &datastore_id, beep_id)) {
		ast_autochan_destroy(mixmonitor->autochan);
		mixmonitor_free(mixmonitor);
		ast_free(datastore_id);
		return -1;
	}

	if (!ast_strlen_zero(uid_channel_var)) {
		if (datastore_id) {
			pbx_builtin_setvar_helper(chan, uid_channel_var, datastore_id);
		}
	}
	ast_free(datastore_id);

	mixmonitor->name = ast_strdup(ast_channel_name(chan));

	if (!ast_strlen_zero(postprocess2)) {
		mixmonitor->post_process = ast_strdup(postprocess2);
	}

	if (!ast_strlen_zero(recipients)) {
		char callerid[256];
		struct ast_party_connected_line *connected;

		ast_channel_lock(chan);

		/* We use the connected line of the invoking channel for caller ID. */

		connected = ast_channel_connected(chan);
		ast_debug(3, "Connected Line CID = %d - %s : %d - %s\n", connected->id.name.valid,
			connected->id.name.str, connected->id.number.valid,
			connected->id.number.str);
		ast_callerid_merge(callerid, sizeof(callerid),
			S_COR(connected->id.name.valid, connected->id.name.str, NULL),
			S_COR(connected->id.number.valid, connected->id.number.str, NULL),
			"Unknown");

		ast_string_field_set(mixmonitor, call_context, ast_channel_context(chan));
		ast_string_field_set(mixmonitor, call_macrocontext, ast_channel_macrocontext(chan));
		ast_string_field_set(mixmonitor, call_extension, ast_channel_exten(chan));
		ast_string_field_set(mixmonitor, call_callerchan, ast_channel_name(chan));
		ast_string_field_set(mixmonitor, call_callerid, callerid);
		mixmonitor->call_priority = ast_channel_priority(chan);

		ast_channel_unlock(chan);

		add_vm_recipients_from_string(mixmonitor, recipients);
	}

	ast_set_flag(&mixmonitor->audiohook, AST_AUDIOHOOK_TRIGGER_SYNC);
	if (!ast_test_flag(mixmonitor, MUXFLAG_NO_RWSYNC)) {
		ast_set_flag(&mixmonitor->audiohook, AST_AUDIOHOOK_SUBSTITUTE_SILENCE);
	}

	if (readvol)
		mixmonitor->audiohook.options.read_volume = readvol;
	if (writevol)
		mixmonitor->audiohook.options.write_volume = writevol;

	if (startmon(chan, &mixmonitor->audiohook)) {
		ast_log(LOG_WARNING, "Unable to add '%s' spy to channel '%s'\n",
			mixmonitor_spy_type, ast_channel_name(chan));
		ast_autochan_destroy(mixmonitor->autochan);
		ast_audiohook_destroy(&mixmonitor->audiohook);
		mixmonitor_free(mixmonitor);
		return -1;
	}

	/* reference be released at mixmonitor destruction */
	mixmonitor->callid = ast_read_threadstorage_callid();