app_controlplayback.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.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 Trivial application to control playback of a sound file
 *
 * \author Mark Spencer <markster@digium.com>
 *
 * \ingroup applications
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/pbx.h"
#include "asterisk/app.h"
#include "asterisk/module.h"
#include "asterisk/manager.h"
#include "asterisk/utils.h"
#include "asterisk/astobj2.h"
 
/*** DOCUMENTATION
    <application name="ControlPlayback" language="en_US">
        <synopsis>
            Play a file with fast forward and rewind.
        </synopsis>
        <syntax>
            <parameter name="filename" required="true" />
            <parameter name="skipms">
                <para>This is number of milliseconds to skip when rewinding or
                fast-forwarding.</para>
            </parameter>
            <parameter name="ff">
                <para>Fast-forward when this DTMF digit is received. (defaults to <literal>#</literal>)</para>
            </parameter>
            <parameter name="rew">
                <para>Rewind when this DTMF digit is received. (defaults to <literal>*</literal>)</para>
            </parameter>
            <parameter name="stop">
                <para>Stop playback when this DTMF digit is received.</para>
            </parameter>
            <parameter name="pause">
                <para>Pause playback when this DTMF digit is received.</para>
            </parameter>
            <parameter name="restart">
                <para>Restart playback when this DTMF digit is received.</para>
            </parameter>
            <parameter name="options">
                <optionlist>
                    <option name="o">
                        <argument name="time" required="true">
                            <para>Start at <replaceable>time</replaceable> ms from the
                            beginning of the file.</para>
                        </argument>
                    </option>
                </optionlist>
            </parameter>
        </syntax>
        <description>
            <para>This application will play back the given <replaceable>filename</replaceable>.</para>
            <para>It sets the following channel variables upon completion:</para>
            <variablelist>
                <variable name="CPLAYBACKSTATUS">
                    <para>Contains the status of the attempt as a text string</para>
                    <value name="SUCCESS" />
                    <value name="USERSTOPPED" />
                    <value name="REMOTESTOPPED" />
                    <value name="ERROR" />
                </variable>
                <variable name="CPLAYBACKOFFSET">
                    <para>Contains the offset in ms into the file where playback
                    was at when it stopped. <literal>-1</literal> is end of file.</para>
                </variable>
                <variable name="CPLAYBACKSTOPKEY">
                    <para>If the playback is stopped by the user this variable contains
                    the key that was pressed.</para>
                </variable>
            </variablelist>
        </description>
    </application>
    <manager name="ControlPlayback" language="en_US">
        <synopsis>
            Control the playback of a file being played to a channel.
        </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 that currently has a file being played back to it.</para>
            </parameter>
            <parameter name="Control" required="true">
                <enumlist>
                    <enum  name="stop">
                        <para>Stop the playback operation.</para>
                    </enum>
                    <enum name="forward">
                        <para>Move the current position in the media forward. The amount
                        of time that the stream moves forward is determined by the
                        <replaceable>skipms</replaceable> value passed to the application
                        that initiated the playback.</para>
                        <note>
                            <para>The default skipms value is <literal>3000</literal> ms.</para>
                        </note>
                    </enum>
                    <enum name="reverse">
                        <para>Move the current position in the media backward. The amount
                        of time that the stream moves backward is determined by the
                        <replaceable>skipms</replaceable> value passed to the application
                        that initiated the playback.</para>
                        <note>
                            <para>The default skipms value is <literal>3000</literal> ms.</para>
                        </note>
                    </enum>
                    <enum name="pause">
                        <para>Pause/unpause the playback operation, if supported.
                        If not supported, stop the playback.</para>
                    </enum>
                    <enum name="restart">
                        <para>Restart the playback operation, if supported.
                        If not supported, stop the playback.</para>
                    </enum>
                </enumlist>
            </parameter>
        </syntax>
        <description>
            <para>Control the operation of a media file being played back to a channel.
            Note that this AMI action does not initiate playback of media to channel, but
            rather controls the operation of a media operation that was already initiated
            on the channel.</para>
            <note>
                <para>The <literal>pause</literal> and <literal>restart</literal>
                <replaceable>Control</replaceable> options will stop a playback
                operation if that operation was not initiated from the
                <replaceable>ControlPlayback</replaceable> application or the
                <replaceable>control stream file</replaceable> AGI command.</para>
            </note>
        </description>
        <see-also>
            <ref type="application">Playback</ref>
            <ref type="application">ControlPlayback</ref>
            <ref type="agi">stream file</ref>
            <ref type="agi">control stream file</ref>
        </see-also>
    </manager>
 ***/
static const char app[] = "ControlPlayback";
 
enum {
    OPT_OFFSET = (1 << 1),
};
 
enum {
    OPT_ARG_OFFSET = 0,
    /* must stay as the last entry ... */
    OPT_ARG_ARRAY_LEN,
};
 
AST_APP_OPTIONS(cpb_opts, BEGIN_OPTIONS
    AST_APP_OPTION_ARG('o', OPT_OFFSET, OPT_ARG_OFFSET),
    END_OPTIONS
);
 
static int is_on_phonepad(char key)
{
    return key == 35 || key == 42 || (key >= 48 && key <= 57);
}
 
static int is_argument(const char *haystack, int needle)
{
    if (ast_strlen_zero(haystack))
        return 0;
 
    if (strchr(haystack, needle))
        return -1;
 
    return 0;
}
 
static int controlplayback_exec(struct ast_channel *chan, const char *data)
{
    int res = 0;
    int skipms = 0;
    long offsetms = 0;
    char offsetbuf[20];
    char stopkeybuf[2];
    char *tmp;
    struct ast_flags opts = { 0, };
    char *opt_args[OPT_ARG_ARRAY_LEN];
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(filename);
        AST_APP_ARG(skip);
        AST_APP_ARG(fwd);
        AST_APP_ARG(rev);
        AST_APP_ARG(stop);
        AST_APP_ARG(pause);
        AST_APP_ARG(restart);
        AST_APP_ARG(options);
    );
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_WARNING, "ControlPlayback requires an argument (filename)\n");
        return -1;
    }
 
    tmp = ast_strdupa(data);
    AST_STANDARD_APP_ARGS(args, tmp);
 
    if (args.argc < 1) {
        ast_log(LOG_WARNING, "ControlPlayback requires an argument (filename)\n");
        return -1;
    }
 
    skipms = args.skip ? (atoi(args.skip) ? atoi(args.skip) : 3000) : 3000;
 
    if (!args.fwd || !is_on_phonepad(*args.fwd)) {
        char *digit = "#";
        if (!is_argument(args.rev, *digit) && !is_argument(args.stop, *digit) && !is_argument(args.pause, *digit) && !is_argument(args.restart, *digit))
            args.fwd = digit;
        else
            args.fwd = NULL;
    }
    if (!args.rev || !is_on_phonepad(*args.rev)) {
        char *digit = "*";
        if (!is_argument(args.fwd, *digit) && !is_argument(args.stop, *digit) && !is_argument(args.pause, *digit) && !is_argument(args.restart, *digit))
            args.rev = digit;
        else
            args.rev = NULL;
    }
    ast_debug(1, "Forward key = %s, Rewind key = %s\n", args.fwd, args.rev);
    if (args.stop && !is_on_phonepad(*args.stop))
        args.stop = NULL;
    if (args.pause && !is_on_phonepad(*args.pause))
        args.pause = NULL;
    if (args.restart && !is_on_phonepad(*args.restart))
        args.restart = NULL;
 
    if (args.options) {
        ast_app_parse_options(cpb_opts, &opts, opt_args, args.options);
        if (ast_test_flag(&opts, OPT_OFFSET))
            offsetms = atol(opt_args[OPT_ARG_OFFSET]);
    }
 
    res = ast_control_streamfile(chan, args.filename, args.fwd, args.rev, args.stop, args.pause, args.restart, skipms, &offsetms);
 
    /* If we stopped on one of our stop keys, return 0  */
    if (res > 0 && args.stop && strchr(args.stop, res)) {
        pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "USERSTOPPED");
        snprintf(stopkeybuf, sizeof(stopkeybuf), "%c", res);
        pbx_builtin_setvar_helper(chan, "CPLAYBACKSTOPKEY", stopkeybuf);
        res = 0;
    } else if (res > 0 && res == AST_CONTROL_STREAM_STOP) {
        pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "REMOTESTOPPED");
        res = 0;
    } else {
        if (res < 0) {
            res = 0;
            pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "ERROR");
        } else
            pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "SUCCESS");
    }
 
    snprintf(offsetbuf, sizeof(offsetbuf), "%ld", offsetms);
    pbx_builtin_setvar_helper(chan, "CPLAYBACKOFFSET", offsetbuf);
 
    return res;
}
 
static int controlplayback_manager(struct mansession *s, const struct message *m)
{
    const char *channel_name = astman_get_header(m, "Channel");
    const char *control_type = astman_get_header(m, "Control");
    struct ast_channel *chan;
 
    if (ast_strlen_zero(channel_name)) {
        astman_send_error(s, m, "Channel not specified");
        return 0;
    }
 
    if (ast_strlen_zero(control_type)) {
        astman_send_error(s, m, "Control not specified");
        return 0;
    }
 
    chan = ast_channel_get_by_name(channel_name);
    if (!chan) {
        astman_send_error(s, m, "No such channel");
        return 0;
    }
 
    if (!strcasecmp(control_type, "stop")) {
        ast_queue_control(chan, AST_CONTROL_STREAM_STOP);
    } else if (!strcasecmp(control_type, "forward")) {
        ast_queue_control(chan, AST_CONTROL_STREAM_FORWARD);
    } else if (!strcasecmp(control_type, "reverse")) {
        ast_queue_control(chan, AST_CONTROL_STREAM_REVERSE);
    } else if (!strcasecmp(control_type, "pause")) {
        ast_queue_control(chan, AST_CONTROL_STREAM_SUSPEND);
    } else if (!strcasecmp(control_type, "restart")) {
        ast_queue_control(chan, AST_CONTROL_STREAM_RESTART);
    } else {
        astman_send_error(s, m, "Unknown control type");
        chan = ast_channel_unref(chan);
        return 0;
    }
 
    chan = ast_channel_unref(chan);
    astman_send_ack(s, m, NULL);
    return 0;
}
 
static int unload_module(void)
{
    int res = 0;
 
    res |= ast_unregister_application(app);
    res |= ast_manager_unregister("ControlPlayback");
 
    return res;
}
 
static int load_module(void)
{
    int res = 0;
 
    res |= ast_register_application_xml(app, controlplayback_exec);
    res |= ast_manager_register_xml("ControlPlayback", EVENT_FLAG_CALL, controlplayback_manager);
 
    return res;
}
 
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Control Playback Application");