rc.c

/*****************************************************************************
 * rc.c : remote control stdin/stdout module for vlc
 *****************************************************************************
 * Copyright (C) 2004-2007 the VideoLAN team
 * $Id$
 *
 * Author: Peter Surda <shurdeek@panorama.sth.ac.at>
 *         Jean-Paul Saman <jpsaman #_at_# m2x _replaceWith#dot_ nl>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>

#include <errno.h>                                                 /* ENOMEM */
#include <ctype.h>
#include <signal.h>

#include <vlc_interface.h>
#include <vlc_aout.h>
#include <vlc_vout.h>
#include <vlc_osd.h>
#include <vlc_playlist.h>
#include <vlc_update.h>

#ifdef HAVE_UNISTD_H
#    include <unistd.h>
#endif

#ifdef HAVE_SYS_TIME_H
#    include <sys/time.h>
#endif
#include <sys/types.h>

#include <vlc_network.h>
#include "vlc_url.h"

#include <vlc_charset.h>

#if defined(AF_UNIX) && !defined(AF_LOCAL)
#    define AF_LOCAL AF_UNIX
#endif

#if defined(AF_LOCAL) && ! defined(WIN32)
#    include <sys/un.h>
#endif

#define MAX_LINE_LENGTH 256
#define STATUS_CHANGE "status change: "

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Activate     ( vlc_object_t * );
static void Deactivate   ( vlc_object_t * );
static void Run          ( intf_thread_t * );

static void Help         ( intf_thread_t *, vlc_bool_t );
static void RegisterCallbacks( intf_thread_t * );

static vlc_bool_t ReadCommand( intf_thread_t *, char *, int * );

static input_item_t *parse_MRL( intf_thread_t *, char * );

static int  Input        ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  Playlist     ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  Quit         ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  Intf         ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  Volume       ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  VolumeMove   ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  VideoConfig  ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  AudioConfig  ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  Menu         ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );
static int  Statistics   ( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );

static int updateStatistics( intf_thread_t *, input_item_t *);
#ifdef UPDATE_CHECK
static void checkUpdates( intf_thread_t *p_intf );
#endif

/* Status Callbacks */
static int TimeOffsetChanged( vlc_object_t *, char const *,
                              vlc_value_t, vlc_value_t , void * );
static int VolumeChanged    ( vlc_object_t *, char const *,
                              vlc_value_t, vlc_value_t, void * );
static int StateChanged     ( vlc_object_t *, char const *,
                              vlc_value_t, vlc_value_t, void * );
static int RateChanged      ( vlc_object_t *, char const *,
                              vlc_value_t, vlc_value_t, void * );

struct intf_sys_t
{
    int *pi_socket_listen;
    int i_socket;
    char *psz_unix_path;

    /* status changes */
    vlc_mutex_t       status_lock;
    playlist_status_t i_last_state;
    vlc_bool_t        b_statistics;

#ifdef WIN32
    HANDLE hConsoleIn;
    vlc_bool_t b_quiet;
#endif
};

#ifdef HAVE_VARIADIC_MACROS
#   define msg_rc( psz_format, args... ) \
      __msg_rc( p_intf, psz_format, ## args )
#endif

static void __msg_rc( intf_thread_t *p_intf, const char *psz_fmt, ... )
{
    va_list args;
    va_start( args, psz_fmt );

    if( p_intf->p_sys->i_socket == -1 )
    {
        utf8_vfprintf( stdout, psz_fmt, args );
        printf( "\r\n" );
    }
    else
    {
        net_vaPrintf( p_intf, p_intf->p_sys->i_socket, NULL, psz_fmt, args );
        net_Write( p_intf, p_intf->p_sys->i_socket, NULL, (uint8_t*)"\r\n", 2 );
    }
    va_end( args );
}

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define POS_TEXT N_("Show stream position")
#define POS_LONGTEXT N_("Show the current position in seconds within the " \
                        "stream from time to time." )

#define TTY_TEXT N_("Fake TTY")
#define TTY_LONGTEXT N_("Force the rc module to use stdin as if it was a TTY.")

#define UNIX_TEXT N_("UNIX socket command input")
#define UNIX_LONGTEXT N_("Accept commands over a Unix socket rather than " \
                         "stdin." )

#define HOST_TEXT N_("TCP command input")
#define HOST_LONGTEXT N_("Accept commands over a socket rather than stdin. " \
            "You can set the address and port the interface will bind to." )

#ifdef WIN32
#define QUIET_TEXT N_("Do not open a DOS command box interface")
#define QUIET_LONGTEXT N_( \
    "By default the rc interface plugin will start a DOS command box. " \
    "Enabling the quiet mode will not bring this command box but can also " \
    "be pretty annoying when you want to stop VLC and no video window is " \
    "open." )
#endif

vlc_module_begin();
    set_shortname( _("RC"));
    set_category( CAT_INTERFACE );
    set_subcategory( SUBCAT_INTERFACE_MAIN );
    set_description( _("Remote control interface") );
    add_bool( "rc-show-pos", 0, NULL, POS_TEXT, POS_LONGTEXT, VLC_TRUE );

#ifdef WIN32
    add_bool( "rc-quiet", 0, NULL, QUIET_TEXT, QUIET_LONGTEXT, VLC_FALSE );
#else
#if defined (HAVE_ISATTY)
    add_bool( "rc-fake-tty", 0, NULL, TTY_TEXT, TTY_LONGTEXT, VLC_TRUE );
#endif
    add_string( "rc-unix", 0, NULL, UNIX_TEXT, UNIX_LONGTEXT, VLC_TRUE );
#endif
    add_string( "rc-host", 0, NULL, HOST_TEXT, HOST_LONGTEXT, VLC_TRUE );

    set_capability( "interface", 20 );

    set_callbacks( Activate, Deactivate );
vlc_module_end();

/*****************************************************************************
 * Activate: initialize and create stuff
 *****************************************************************************/
static int Activate( vlc_object_t *p_this )
{
    intf_thread_t *p_intf = (intf_thread_t*)p_this;
    char *psz_host, *psz_unix_path;
    int  *pi_socket = NULL;

#ifndef WIN32
#if defined(HAVE_ISATTY)
    /* Check that stdin is a TTY */
    if( !config_GetInt( p_intf, "rc-fake-tty" ) && !isatty( 0 ) )
    {
        msg_Warn( p_intf, "fd 0 is not a TTY" );
        return VLC_EGENERIC;
    }
#endif

    psz_unix_path = config_GetPsz( p_intf, "rc-unix" );
    if( psz_unix_path )
    {
        int i_socket;

#ifndef AF_LOCAL
        msg_Warn( p_intf, "your OS doesn't support filesystem sockets" );
        free( psz_unix_path );
        return VLC_EGENERIC;
#else
        struct sockaddr_un addr;

        memset( &addr, 0, sizeof(struct sockaddr_un) );

        msg_Dbg( p_intf, "trying UNIX socket" );

        if( (i_socket = socket( AF_LOCAL, SOCK_STREAM, 0 ) ) < 0 )
        {
            msg_Warn( p_intf, "can't open socket: %m" );
            free( psz_unix_path );
            return VLC_EGENERIC;
        }

        addr.sun_family = AF_LOCAL;
        strncpy( addr.sun_path, psz_unix_path, sizeof( addr.sun_path ) );
        addr.sun_path[sizeof( addr.sun_path ) - 1] = '\0';

        if (bind (i_socket, (struct sockaddr *)&addr, sizeof (addr))
         && (errno == EADDRINUSE)
         && connect (i_socket, (struct sockaddr *)&addr, sizeof (addr))
         && (errno == ECONNREFUSED))
        {
            msg_Info (p_intf, "Removing dead UNIX socket: %s", psz_unix_path);
            unlink (psz_unix_path);

            if (bind (i_socket, (struct sockaddr *)&addr, sizeof (addr)))
            {
                msg_Err (p_intf, "cannot bind UNIX socket at %s: %m",
                         psz_unix_path);
                free (psz_unix_path);
                net_Close (i_socket);
                return VLC_EGENERIC;
            }
        }

        if( listen( i_socket, 1 ) )
        {
            msg_Warn( p_intf, "can't listen on socket: %m");
            free( psz_unix_path );
            net_Close( i_socket );
            return VLC_EGENERIC;
        }

        /* FIXME: we need a core function to merge listening sockets sets */
        pi_socket = calloc( 2, sizeof( int ) );
        if( pi_socket == NULL )
        {
            free( psz_unix_path );
            net_Close( i_socket );
            return VLC_ENOMEM;
        }
        pi_socket[0] = i_socket;
        pi_socket[1] = -1;
#endif /* AF_LOCAL */
    }
#endif /* !WIN32 */

    if( ( pi_socket == NULL ) &&
        ( psz_host = config_GetPsz( p_intf, "rc-host" ) ) != NULL )
    {
        vlc_url_t url;

        vlc_UrlParse( &url, psz_host, 0 );

        msg_Dbg( p_intf, "base: %s, port: %d", url.psz_host, url.i_port );

        pi_socket = net_ListenTCP(p_this, url.psz_host, url.i_port);
        if( pi_socket == NULL )
        {
            msg_Warn( p_intf, "can't listen to %s port %i",
                      url.psz_host, url.i_port );
            vlc_UrlClean( &url );
            free( psz_host );
            return VLC_EGENERIC;
        }

        vlc_UrlClean( &url );
        free( psz_host );
    }

    p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
    if( !p_intf->p_sys )
    {
        msg_Err( p_intf, "no memory" );
        return VLC_ENOMEM;
    }

    p_intf->p_sys->pi_socket_listen = pi_socket;
    p_intf->p_sys->i_socket = -1;
    p_intf->p_sys->psz_unix_path = psz_unix_path;
    vlc_mutex_init( p_intf, &p_intf->p_sys->status_lock );
    p_intf->p_sys->i_last_state = PLAYLIST_STOPPED;
    p_intf->p_sys->b_statistics = VLC_FALSE;

    /* Non-buffered stdout */
    setvbuf( stdout, (char *)NULL, _IOLBF, 0 );

    p_intf->pf_run = Run;

#ifdef WIN32
    p_intf->p_sys->b_quiet = config_GetInt( p_intf, "rc-quiet" );
    if( !p_intf->p_sys->b_quiet ) { CONSOLE_INTRO_MSG; }
#else
    CONSOLE_INTRO_MSG;
#endif

    msg_rc( _("Remote control interface initialized. Type `help' for help.") );
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Deactivate: uninitialize and cleanup
 *****************************************************************************/
static void Deactivate( vlc_object_t *p_this )
{
    intf_thread_t *p_intf = (intf_thread_t*)p_this;

    net_ListenClose( p_intf->p_sys->pi_socket_listen );
    if( p_intf->p_sys->i_socket != -1 )
        net_Close( p_intf->p_sys->i_socket );
    if( p_intf->p_sys->psz_unix_path != NULL )
    {
#if defined(AF_LOCAL) && !defined(WIN32)
        unlink( p_intf->p_sys->psz_unix_path );
#endif
        free( p_intf->p_sys->psz_unix_path );
    }
    vlc_mutex_destroy( &p_intf->p_sys->status_lock );
    free( p_intf->p_sys );
}

/*****************************************************************************
 * RegisterCallbacks: Register callbacks to dynamic variables
 *****************************************************************************/
static void RegisterCallbacks( intf_thread_t *p_intf )
{
    /* Register commands that will be cleaned up upon object destruction */
#define ADD( name, type, target )                                   \
    var_Create( p_intf, name, VLC_VAR_ ## type | VLC_VAR_ISCOMMAND ); \
    var_AddCallback( p_intf, name, target, NULL );
    ADD( "quit", VOID, Quit )
    ADD( "intf", STRING, Intf )

    ADD( "add", STRING, Playlist )
    ADD( "repeat", STRING, Playlist )
    ADD( "loop", STRING, Playlist )
    ADD( "random", STRING, Playlist )
    ADD( "enqueue", STRING, Playlist )
    ADD( "playlist", VOID, Playlist )
    ADD( "sort", VOID, Playlist )
    ADD( "play", VOID, Playlist )
    ADD( "stop", VOID, Playlist )
    ADD( "clear", VOID, Playlist )
    ADD( "prev", VOID, Playlist )
    ADD( "next", VOID, Playlist )
    ADD( "goto", INTEGER, Playlist )
    ADD( "status", INTEGER, Playlist )

    /* OSD menu commands */
    ADD(  "menu", STRING, Menu )

    /* DVD commands */
    ADD( "pause", VOID, Input )
    ADD( "seek", INTEGER, Input )
    ADD( "title", STRING, Input )
    ADD( "title_n", VOID, Input )
    ADD( "title_p", VOID, Input )
    ADD( "chapter", STRING, Input )
    ADD( "chapter_n", VOID, Input )
    ADD( "chapter_p", VOID, Input )

    ADD( "fastforward", VOID, Input )
    ADD( "rewind", VOID, Input )
    ADD( "faster", VOID, Input )
    ADD( "slower", VOID, Input )
    ADD( "normal", VOID, Input )

    ADD( "atrack", STRING, Input )
    ADD( "vtrack", STRING, Input )
    ADD( "strack", STRING, Input )

    /* video commands */
    ADD( "vratio", STRING, VideoConfig )
    ADD( "vcrop", STRING, VideoConfig )
    ADD( "vzoom", STRING, VideoConfig )
    ADD( "snapshot", VOID, VideoConfig )

    /* audio commands */
    ADD( "volume", STRING, Volume )
    ADD( "volup", STRING, VolumeMove )
    ADD( "voldown", STRING, VolumeMove )
    ADD( "adev", STRING, AudioConfig )
    ADD( "achan", STRING, AudioConfig )

    /* misc menu commands */
    ADD( "stats", BOOL, Statistics )

#undef ADD
}

/*****************************************************************************
 * Run: rc thread
 *****************************************************************************
 * This part of the interface is in a separate thread so that we can call
 * exec() from within it without annoying the rest of the program.
 *****************************************************************************/
static void Run( intf_thread_t *p_intf )
{
    input_thread_t * p_input;
    playlist_t *     p_playlist;

    char       p_buffer[ MAX_LINE_LENGTH + 1 ];
    vlc_bool_t b_showpos = config_GetInt( p_intf, "rc-show-pos" );
    vlc_bool_t b_longhelp = VLC_FALSE;

    int        i_size = 0;
    int        i_oldpos = 0;
    int        i_newpos;

    p_buffer[0] = 0;
    p_input = NULL;
    p_playlist = NULL;

    /* Register commands that will be cleaned up upon object destruction */
    RegisterCallbacks( p_intf );

    /* status callbacks */
    /* Listen to audio volume updates */
    var_AddCallback( p_intf->p_libvlc, "volume-change", VolumeChanged, p_intf );

#ifdef WIN32
    /* Get the file descriptor of the console input */
    p_intf->p_sys->hConsoleIn = GetStdHandle(STD_INPUT_HANDLE);
    if( p_intf->p_sys->hConsoleIn == INVALID_HANDLE_VALUE )
    {
        msg_Err( p_intf, "couldn't find user input handle" );
        vlc_object_kill( p_intf );
    }
#endif

    while( !intf_ShouldDie( p_intf ) )
    {
        char *psz_cmd, *psz_arg;
        vlc_bool_t b_complete;

        if( p_intf->p_sys->pi_socket_listen != NULL &&
            p_intf->p_sys->i_socket == -1 )
        {
            p_intf->p_sys->i_socket =
                net_Accept( p_intf, p_intf->p_sys->pi_socket_listen,
                            INTF_IDLE_SLEEP );
            if( p_intf->p_sys->i_socket == -1 ) continue;
        }

        b_complete = ReadCommand( p_intf, p_buffer, &i_size );

        /* Manage the input part */
        if( p_input == NULL )
        {
            if( p_playlist )
            {
                p_input = vlc_object_find( p_playlist, VLC_OBJECT_INPUT,
                                                       FIND_CHILD );
            }
            else
            {
                p_input = vlc_object_find( p_intf, VLC_OBJECT_INPUT,
                                                   FIND_ANYWHERE );
                if( p_input )
                {
                    p_playlist = vlc_object_find( p_input, VLC_OBJECT_PLAYLIST,
                                                           FIND_PARENT );
                }
            }
            /* New input has been registered */
            if( p_input )
            {
                if( !p_input->b_dead || !p_input->b_die )
                {
                    char *psz_uri =
                            input_item_GetURI( input_GetItem( p_input ) );
                    msg_rc( STATUS_CHANGE "( new input: %s )", psz_uri );
                    free( psz_uri );
                    msg_rc( STATUS_CHANGE "( audio volume: %d )",
                            config_GetInt( p_intf, "volume" ));
                }
                var_AddCallback( p_input, "state", StateChanged, p_intf );
                var_AddCallback( p_input, "rate-faster", RateChanged, p_intf );
                var_AddCallback( p_input, "rate-slower", RateChanged, p_intf );
                var_AddCallback( p_input, "rate", RateChanged, p_intf );
                var_AddCallback( p_input, "time-offset", TimeOffsetChanged,
                                 p_intf );
            }
        }
        else if( p_input->b_dead )
        {
            var_DelCallback( p_input, "state", StateChanged, p_intf );
            var_DelCallback( p_input, "rate-faster", RateChanged, p_intf );
            var_DelCallback( p_input, "rate-slower", RateChanged, p_intf );
            var_DelCallback( p_input, "rate", RateChanged, p_intf );
            var_DelCallback( p_input, "time-offset", TimeOffsetChanged,
                             p_intf );
            vlc_object_release( p_input );
            p_input = NULL;

            if( p_playlist )
            {
                vlc_mutex_lock( &p_playlist->object_lock );
                p_intf->p_sys->i_last_state = (int) PLAYLIST_STOPPED;
                msg_rc( STATUS_CHANGE "( stop state: 0 )" );
                vlc_mutex_unlock( &p_playlist->object_lock );
            }
        }

        if( (p_input != NULL) && !p_input->b_dead && !p_input->b_die &&
            (p_playlist != NULL) )
        {
            vlc_mutex_lock( &p_playlist->object_lock );
            if( (p_intf->p_sys->i_last_state != p_playlist->status.i_status) &&
                (p_playlist->status.i_status == PLAYLIST_STOPPED) )
            {
                p_intf->p_sys->i_last_state = PLAYLIST_STOPPED;
                msg_rc( STATUS_CHANGE "( stop state: 0 )" );
            }
            else if(
                (p_intf->p_sys->i_last_state != p_playlist->status.i_status) &&
                (p_playlist->status.i_status == PLAYLIST_RUNNING) )
            {
                p_intf->p_sys->i_last_state = p_playlist->status.i_status;
                msg_rc( STATUS_CHANGE "( play state: 1 )" );
            }
            else if(
                (p_intf->p_sys->i_last_state != p_playlist->status.i_status) &&
                (p_playlist->status.i_status == PLAYLIST_PAUSED) )
            {
                p_intf->p_sys->i_last_state = p_playlist->status.i_status;
                msg_rc( STATUS_CHANGE "( pause state: 2 )" );
            }
            vlc_mutex_unlock( &p_playlist->object_lock );
        }

        if( p_input && b_showpos )
        {
            i_newpos = 100 * var_GetFloat( p_input, "position" );
            if( i_oldpos != i_newpos )
            {
                i_oldpos = i_newpos;
                msg_rc( "pos: %d%%", i_newpos );
            }
        }

        if( p_input && p_intf->p_sys->b_statistics )
        {
            vlc_mutex_lock( &input_GetItem(p_input)->lock );
            updateStatistics( p_intf, input_GetItem(p_input) );
            vlc_mutex_unlock( &input_GetItem(p_input)->lock );
        }

        /* Is there something to do? */
        if( !b_complete ) continue;

        /* Skip heading spaces */
        psz_cmd = p_buffer;
        while( *psz_cmd == ' ' )
        {
            psz_cmd++;
        }

        /* Split psz_cmd at the first space and make sure that
         * psz_arg is valid */
        psz_arg = strchr( psz_cmd, ' ' );
        if( psz_arg )
        {
            *psz_arg++ = 0;
            while( *psz_arg == ' ' )
            {
                psz_arg++;
            }
        }
        else
        {
            psz_arg = "";
        }

        /* module specfic commands: @<module name> <command> <args...> */
        if( *psz_cmd == '@' && *psz_arg )
        {
            /* Parse miscellaneous commands */
            char *psz_alias = psz_cmd + 1;
            char *psz_mycmd = strdup( psz_arg );
            char *psz_myarg = strchr( psz_mycmd, ' ' );
            char *psz_msg;

            if( !psz_myarg )
            {
                msg_rc( "Not enough parameters." );
            }
            else
            {
                *psz_myarg = '\0';
                psz_myarg ++;

                var_Command( p_intf, psz_alias, psz_mycmd, psz_myarg,
                             &psz_msg );

                if( psz_msg )
                {
                    msg_rc( psz_msg );
                    free( psz_msg );
                }
            }
            free( psz_mycmd );
        }
        /* If the user typed a registered local command, try it */
        else if( var_Type( p_intf, psz_cmd ) & VLC_VAR_ISCOMMAND )
        {
            vlc_value_t val;
            int i_ret;

            val.psz_string = psz_arg;
            i_ret = var_Set( p_intf, psz_cmd, val );
            msg_rc( "%s: returned %i (%s)",
                    psz_cmd, i_ret, vlc_error( i_ret ) );
        }
        /* Or maybe it's a global command */
        else if( var_Type( p_intf->p_libvlc, psz_cmd ) & VLC_VAR_ISCOMMAND )
        {
            vlc_value_t val;
            int i_ret;

            val.psz_string = psz_arg;
            /* FIXME: it's a global command, but we should pass the
             * local object as an argument, not p_intf->p_libvlc. */
            i_ret = var_Set( p_intf->p_libvlc, psz_cmd, val );
            if( i_ret != 0 )
            {
                msg_rc( "%s: returned %i (%s)",
                         psz_cmd, i_ret, vlc_error( i_ret ) );
            }
        }
        else if( !strcmp( psz_cmd, "logout" ) )
        {
            /* Close connection */
            if( p_intf->p_sys->i_socket != -1 )
            {
                net_Close( p_intf->p_sys->i_socket );
            }
            p_intf->p_sys->i_socket = -1;
        }
        else if( !strcmp( psz_cmd, "info" ) )
        {
            if( p_input )
            {
                int i, j;
                vlc_mutex_lock( &input_GetItem(p_input)->lock );
                for ( i = 0; i < input_GetItem(p_input)->i_categories; i++ )
                {
                    info_category_t *p_category = input_GetItem(p_input)
                                                        ->pp_categories[i];

                    msg_rc( "+----[ %s ]", p_category->psz_name );
                    msg_rc( "| " );
                    for ( j = 0; j < p_category->i_infos; j++ )
                    {
                        info_t *p_info = p_category->pp_infos[j];
                        msg_rc( "| %s: %s", p_info->psz_name,
                                p_info->psz_value );
                    }
                    msg_rc( "| " );
                }
                msg_rc( "+----[ end of stream info ]" );
                vlc_mutex_unlock( &input_GetItem(p_input)->lock );
            }
            else
            {
                msg_rc( "no input" );
            }
        }
        else if( !strcmp( psz_cmd, "is_playing" ) )
        {
            if( ! p_input )
            {
                msg_rc( "0" );
            }
            else
            {
                msg_rc( "1" );
            }
        }
        else if( !strcmp( psz_cmd, "get_time" ) )
        {
            if( ! p_input )
            {
                msg_rc("0");
            }
            else
            {
                vlc_value_t time;
                var_Get( p_input, "time", &time );
                msg_rc( "%i", time.i_time / 1000000);
            }
        }
        else if( !strcmp( psz_cmd, "get_length" ) )
        {
            if( ! p_input )
            {
                msg_rc("0");
            }
            else
            {
                vlc_value_t time;
                var_Get( p_input, "length", &time );
                msg_rc( "%i", time.i_time / 1000000);
            }
        }
        else if( !strcmp( psz_cmd, "get_title" ) )
        {
            if( ! p_input )
            {
                msg_rc("");
            }
            else
            {
                msg_rc( "%s", input_GetItem(p_input)->psz_name );
            }
        }
        else if( !strcmp( psz_cmd, "longhelp" ) || !strncmp( psz_cmd, "h", 1 )
                 || !strncmp( psz_cmd, "H", 1 ) || !strncmp( psz_cmd, "?", 1 ) )
        {
            if( !strcmp( psz_cmd, "longhelp" ) || !strncmp( psz_cmd, "H", 1 ) )
                 b_longhelp = VLC_TRUE;
            else b_longhelp = VLC_FALSE;

            Help( p_intf, b_longhelp );
        }
#ifdef UPDATE_CHECK
        else if( !strcmp( psz_cmd, "check-updates" ) )
        {
            checkUpdates( p_intf );
        }
#endif
        else if( !strcmp( psz_cmd, "key" ) || !strcmp( psz_cmd, "hotkey" ) )
        {
            var_SetInteger( p_intf->p_libvlc, "key-pressed",
                            config_GetInt( p_intf, psz_arg ) );
        }
        else switch( psz_cmd[0] )
        {
        case 'f':
        case 'F':
            if( p_input )
            {
                vout_thread_t *p_vout;
                p_vout = vlc_object_find( p_input,
                                          VLC_OBJECT_VOUT, FIND_CHILD );

                if( p_vout )
                {
                    vlc_value_t val;
                    vlc_bool_t b_update = VLC_FALSE;
                    var_Get( p_vout, "fullscreen", &val );
                    val.b_bool = !val.b_bool;
                    if( !strncmp( psz_arg, "on", 2 )
                        && ( val.b_bool == VLC_TRUE ) )
                    {
                        b_update = VLC_TRUE;
                        val.b_bool = VLC_TRUE;
                    }
                    else if( !strncmp( psz_arg, "off", 3 )
                             && ( val.b_bool == VLC_FALSE ) )
                    {
                        b_update = VLC_TRUE;
                        val.b_bool = VLC_FALSE;
                    }
                    else if( strncmp( psz_arg, "off", 3 )
                             && strncmp( psz_arg, "on", 2 ) )
                        b_update = VLC_TRUE;
                    if( b_update ) var_Set( p_vout, "fullscreen", val );
                    vlc_object_release( p_vout );
                }
            }
            break;

        case 's':
        case 'S':
            ;
            break;

        case '\0':
            /* Ignore empty lines */
            break;

        default:
            msg_rc(_("Unknown command `%s'. Type `help' for help."), psz_cmd);
            break;
        }

        /* Command processed */
        i_size = 0; p_buffer[0] = 0;
    }

    msg_rc( STATUS_CHANGE "( stop state: 0 )" );
    msg_rc( STATUS_CHANGE "( quit )" );

    if( p_input )
    {
        var_DelCallback( p_input, "state", StateChanged, p_intf );
        var_DelCallback( p_input, "rate-faster", RateChanged, p_intf );
        var_DelCallback( p_input, "rate-slower", RateChanged, p_intf );
        var_DelCallback( p_input, "rate", RateChanged, p_intf );
        var_DelCallback( p_input, "time-offset", TimeOffsetChanged, p_intf );
        vlc_object_release( p_input );
        p_input = NULL;
    }

    if( p_playlist )
    {
        vlc_object_release( p_playlist );
        p_playlist = NULL;
    }

    var_DelCallback( p_intf->p_libvlc, "volume-change", VolumeChanged, p_intf );
}

static void Help( intf_thread_t *p_intf, vlc_bool_t b_longhelp)
{
    msg_rc(_("+----[ Remote control commands ]"));
    msg_rc(  "| ");
    msg_rc(_("| add XYZ  . . . . . . . . . . . . add XYZ to playlist"));
    msg_rc(_("| enqueue XYZ  . . . . . . . . . queue XYZ to playlist"));
    msg_rc(_("| playlist . . . . .  show items currently in playlist"));
    msg_rc(_("| play . . . . . . . . . . . . . . . . . . play stream"));
    msg_rc(_("| stop . . . . . . . . . . . . . . . . . . stop stream"));
    msg_rc(_("| next . . . . . . . . . . . . . .  next playlist item"));
    msg_rc(_("| prev . . . . . . . . . . . .  previous playlist item"));
    msg_rc(_("| goto . . . . . . . . . . . . . .  goto item at index"));
    msg_rc(_("| repeat [on|off] . . . .  toggle playlist item repeat"));
    msg_rc(_("| loop [on|off] . . . . . . . . . toggle playlist loop"));
    msg_rc(_("| random [on|off] . . . . . . .  toggle random jumping"));
    msg_rc(_("| clear . . . . . . . . . . . . . . clear the playlist"));
    msg_rc(_("| status . . . . . . . . . . . current playlist status"));
    msg_rc(_("| title [X]  . . . . . . set/get title in current item"));
    msg_rc(_("| title_n  . . . . . . . .  next title in current item"));
    msg_rc(_("| title_p  . . . . . .  previous title in current item"));
    msg_rc(_("| chapter [X]  . . . . set/get chapter in current item"));
    msg_rc(_("| chapter_n  . . . . . .  next chapter in current item"));
    msg_rc(_("| chapter_p  . . . .  previous chapter in current item"));
    msg_rc(  "| ");
    msg_rc(_("| seek X . . . seek in seconds, for instance `seek 12'"));
    msg_rc(_("| pause  . . . . . . . . . . . . . . . .  toggle pause"));
    msg_rc(_("| fastforward  . . . . . . . .  .  set to maximum rate"));
    msg_rc(_("| rewind  . . . . . . . . . . . .  set to minimum rate"));
    msg_rc(_("| faster . . . . . . . . . .  faster playing of stream"));
    msg_rc(_("| slower . . . . . . . . . .  slower playing of stream"));
    msg_rc(_("| normal . . . . . . . . . .  normal playing of stream"));
    msg_rc(_("| f [on|off] . . . . . . . . . . . . toggle fullscreen"));
    msg_rc(_("| info . . . . .  information about the current stream"));
    msg_rc(_("| stats  . . . . . . . .  show statistical information"));
    msg_rc(_("| get_time . . seconds elapsed since stream's beginning"));
    msg_rc(_("| is_playing . . . .  1 if a stream plays, 0 otherwise"));
    msg_rc(_("| get_title . . . . .  the title of the current stream"));
    msg_rc(_("| get_length . . . .  the length of the current stream"));
    msg_rc(  "| ");
    msg_rc(_("| volume [X] . . . . . . . . . .  set/get audio volume"));
    msg_rc(_("| volup [X]  . . . . . . .  raise audio volume X steps"));
    msg_rc(_("| voldown [X]  . . . . . .  lower audio volume X steps"));
    msg_rc(_("| adev [X] . . . . . . . . . . .  set/get audio device"));
    msg_rc(_("| achan [X]. . . . . . . . . .  set/get audio channels"));
    msg_rc(_("| atrack [X] . . . . . . . . . . . set/get audio track"));
    msg_rc(_("| vtrack [X] . . . . . . . . . . . set/get video track"));
    msg_rc(_("| vratio [X]  . . . . . . . set/get video aspect ratio"));
    msg_rc(_("| vcrop [X]  . . . . . . . . . . .  set/get video crop"));
    msg_rc(_("| vzoom [X]  . . . . . . . . . . .  set/get video zoom"));
    msg_rc(_("| snapshot . . . . . . . . . . . . take video snapshot"));
    msg_rc(_("| strack [X] . . . . . . . . . set/get subtitles track"));
    msg_rc(_("| key [hotkey name] . . . . . .  simulate hotkey press"));
    msg_rc(_("| menu . . [on|off|up|down|left|right|select] use menu"));
    msg_rc(  "| ");

    if (b_longhelp)
    {
        msg_rc(_("| @name marq-marquee  STRING  . . overlay STRING in video"));
        msg_rc(_("| @name marq-x X . . . . . . . . . . . .offset from left"));
        msg_rc(_("| @name marq-y Y . . . . . . . . . . . . offset from top"));
        msg_rc(_("| @name marq-position #. . .  .relative position control"));
        msg_rc(_("| @name marq-color # . . . . . . . . . . font color, RGB"));
        msg_rc(_("| @name marq-opacity # . . . . . . . . . . . . . opacity"));
        msg_rc(_("| @name marq-timeout T. . . . . . . . . . timeout, in ms"));
        msg_rc(_("| @name marq-size # . . . . . . . . font size, in pixels"));
        msg_rc(  "| ");
        msg_rc(_("| @name logo-file STRING . . .the overlay file path/name"));
        msg_rc(_("| @name logo-x X . . . . . . . . . . . .offset from left"));
        msg_rc(_("| @name logo-y Y . . . . . . . . . . . . offset from top"));
        msg_rc(_("| @name logo-position #. . . . . . . . relative position"));
        msg_rc(_("| @name logo-transparency #. . . . . . . . .transparency"));
        msg_rc(  "| ");
        msg_rc(_("| @name mosaic-alpha # . . . . . . . . . . . . . . alpha"));
        msg_rc(_("| @name mosaic-height #. . . . . . . . . . . . . .height"));
        msg_rc(_("| @name mosaic-width # . . . . . . . . . . . . . . width"));
        msg_rc(_("| @name mosaic-xoffset # . . . .top left corner position"));
        msg_rc(_("| @name mosaic-yoffset # . . . .top left corner position"));
        msg_rc(_("| @name mosaic-offsets x,y(,x,y)*. . . . list of offsets"));
        msg_rc(_("| @name mosaic-align 0..2,4..6,8..10. . .mosaic alignment"));
        msg_rc(_("| @name mosaic-vborder # . . . . . . . . vertical border"));
        msg_rc(_("| @name mosaic-hborder # . . . . . . . horizontal border"));
        msg_rc(_("| @name mosaic-position {0=auto,1=fixed} . . . .position"));
        msg_rc(_("| @name mosaic-rows #. . . . . . . . . . .number of rows"));
        msg_rc(_("| @name mosaic-cols #. . . . . . . . . . .number of cols"));
        msg_rc(_("| @name mosaic-order id(,id)* . . . . order of pictures "));
        msg_rc(_("| @name mosaic-keep-aspect-ratio {0,1} . . .aspect ratio"));
#ifdef UPDATE_CHECK
        msg_rc(  "| ");
        msg_rc(_("| check-updates [newer] [equal] [older]\n"
                 "|               [undef] [info] [source] [binary] [plugin]"));
#endif
        msg_rc(  "| ");
    }
    msg_rc(_("| help . . . . . . . . . . . . . . . this help message"));
    msg_rc(_("| longhelp . . . . . . . . . . . a longer help message"));
    msg_rc(_("| logout . . . . . . .  exit (if in socket connection)"));
    msg_rc(_("| quit . . . . . . . . . . . . . . . . . . .  quit vlc"));
    msg_rc(  "| ");
    msg_rc(_("+----[ end of help ]"));
}

/********************************************************************
 * Status callback routines
 ********************************************************************/
static int TimeOffsetChanged( vlc_object_t *p_this, char const *psz_cmd,
    vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    intf_thread_t *p_intf = (intf_thread_t*)p_data;
    input_thread_t *p_input = NULL;

    vlc_mutex_lock( &p_intf->p_sys->status_lock );
    p_input = vlc_object_find( p_intf, VLC_OBJECT_INPUT, FIND_ANYWHERE );
    if( p_input )
    {
        msg_rc( STATUS_CHANGE "( time-offset: %d )",
                var_GetInteger( p_input, "time-offset" ) );
        vlc_object_release( p_input );
    }
    vlc_mutex_unlock( &p_intf->p_sys->status_lock );
    return VLC_SUCCESS;
}

static int VolumeChanged( vlc_object_t *p_this, char const *psz_cmd,
    vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    intf_thread_t *p_intf = (intf_thread_t*)p_data;

    vlc_mutex_lock( &p_intf->p_sys->status_lock );
    msg_rc( STATUS_CHANGE "( audio volume: %d )",
            config_GetInt( p_this, "volume") );
    vlc_mutex_unlock( &p_intf->p_sys->status_lock );
    return VLC_SUCCESS;
}

static int StateChanged( vlc_object_t *p_this, char const *psz_cmd,
    vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    intf_thread_t *p_intf = (intf_thread_t*)p_data;
    playlist_t    *p_playlist = NULL;
    input_thread_t *p_input = NULL;

    vlc_mutex_lock( &p_intf->p_sys->status_lock );
    p_input = vlc_object_find( p_intf, VLC_OBJECT_INPUT, FIND_ANYWHERE );
    if( p_input )
    {
        p_playlist = vlc_object_find( p_input, VLC_OBJECT_PLAYLIST, FIND_PARENT );
        if( p_playlist )
        {
            char cmd[6];
            switch( p_playlist->status.i_status )
            {
            case PLAYLIST_STOPPED:
                strcpy( cmd, "stop" );
                break;
            case PLAYLIST_RUNNING:
                strcpy( cmd, "play" );
                break;
            case PLAYLIST_PAUSED:
                strcpy( cmd, "pause" );
                break;