/*****************************************************************************
 * mmstu.c: MMS access plug-in
 *****************************************************************************
 * Copyright (C) 2001, 2002 VLC authors and VideoLAN
 * $Id$
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_access.h>

#include <errno.h>
#include <assert.h>
#include <stdnoreturn.h>

#include <sys/types.h>
#include <unistd.h>
#ifdef HAVE_POLL
#   include <poll.h>
#endif

#include <vlc_charset.h>
#include <vlc_network.h>
#include <vlc_url.h>
#include <vlc_interrupt.h>
#include <vlc_es.h>
#include "asf.h"
#include "buffer.h"

#include "mms.h"
#include "mmstu.h"

#undef MMS_DEBUG

/****************************************************************************
 * NOTES:
 *  MMSProtocole documentation found at http://get.to/sdp
 ****************************************************************************/

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
int   MMSTUOpen   ( stream_t * );
void  MMSTUClose  ( stream_t * );


static block_t *Block( stream_t *, bool * );
static int Seek( stream_t *, uint64_t );
static int Control( stream_t *, int, va_list );

static int  MMSOpen ( stream_t *, vlc_url_t *, int );
static int  MMSStart( stream_t *, uint32_t );
static int  MMSStop ( stream_t * );
static void MMSClose( stream_t * );


static int  mms_CommandRead( stream_t *p_access, int i_command1, int i_command2 );
static int  mms_CommandSend( stream_t *, int, uint32_t, uint32_t, uint8_t *, int );

static int  mms_HeaderMediaRead( stream_t *, int );

static int  mms_ReceivePacket( stream_t * );

static void KeepAliveStart( stream_t * );
static void KeepAliveStop( stream_t * );

int  MMSTUOpen( stream_t *p_access )
{
    access_sys_t   *p_sys;
    int             i_proto;
    int             i_status;

    /* Set up p_access */
    p_access->pf_read = NULL;
    p_access->pf_block = Block;
    p_access->pf_control = Control;
    p_access->pf_seek = Seek;

    p_access->p_sys = p_sys = calloc( 1, sizeof( access_sys_t ) );
    if( !p_sys ) return VLC_ENOMEM;

    p_sys->i_timeout = var_CreateGetInteger( p_access, "mms-timeout" );

    vlc_mutex_init( &p_sys->lock_netwrite );

    /* *** Parse URL and get server addr/port and path *** */
    vlc_UrlParse( &p_sys->url, p_access->psz_url );
    if( p_sys->url.psz_host == NULL || *p_sys->url.psz_host == '\0' )
    {
        msg_Err( p_access, "invalid server name" );
        vlc_UrlClean( &p_sys->url );
        vlc_mutex_destroy( &p_sys->lock_netwrite );
        free( p_sys );
        return VLC_EGENERIC;
    }
    if( p_sys->url.i_port <= 0 )
    {
        p_sys->url.i_port = 1755;
    }

    /* *** connect to this server *** */
    /* look at  requested protocol (udp/tcp) */
    i_proto = MMS_PROTO_AUTO;
    if( !strncmp( p_access->psz_name, "mmsu", 4 ) )
    {
        i_proto = MMS_PROTO_UDP;
    }
    else if( !strncmp( p_access->psz_name, "mmst", 4 ) )
    {
        i_proto = MMS_PROTO_TCP;
    }

    /* connect */
    if( i_proto == MMS_PROTO_AUTO )
    {   /* first try with TCP and then UDP*/
        i_status = MMSOpen( p_access, &p_sys->url, MMS_PROTO_TCP );
        if( i_status )
            i_status = MMSOpen( p_access, &p_sys->url, MMS_PROTO_UDP );
    }
    else
    {
        i_status = MMSOpen( p_access, &p_sys->url, i_proto );
    }

    if( i_status )
    {
        msg_Err( p_access, "cannot connect to server" );
        vlc_UrlClean( &p_sys->url );
        vlc_mutex_destroy( &p_sys->lock_netwrite );
        free( p_sys );
        return VLC_EGENERIC;
    }

    msg_Dbg( p_access, "connected to %s:%d", p_sys->url.psz_host, p_sys->url.i_port );
    /*
     * i_flags_broadcast
     *  yy xx ?? ??
     *  broadcast    yy=0x02, xx= 0x00
     *  pre-recorded yy=0x01, xx= 0x80 if video, 0x00 no video
     */
    if( p_sys->i_packet_count <= 0 && p_sys->asfh.i_data_packets_count > 0 )
    {
        p_sys->i_packet_count = p_sys->asfh.i_data_packets_count;
    }
    if( p_sys->i_packet_count <= 0 || ( p_sys->i_flags_broadcast >> 24 ) == 0x02 )
    {
        p_sys->b_seekable = false;
    }
    else
    {
        p_sys->b_seekable = true;
        p_sys->i_size =
            (uint64_t)p_sys->i_header +
            (uint64_t)p_sys->i_packet_count * (uint64_t)p_sys->i_packet_length;
    }
    p_sys->b_keep_alive = false;

    /* *** Start stream *** */
    if( MMSStart( p_access, 0xffffffff ) < 0 )
    {
        msg_Err( p_access, "cannot start stream" );
        MMSTUClose ( p_access );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: free unused data structures
 *****************************************************************************/
void MMSTUClose( stream_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;

    KeepAliveStop( p_access );

    /* close connection with server */
    MMSClose( p_access );

    /* free memory */
    vlc_UrlClean( &p_sys->url );

    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( stream_t *p_access, int i_query, va_list args )
{
    access_sys_t *p_sys = p_access->p_sys;
    bool   *pb_bool;
    bool    b_bool;
    int64_t      *pi_64;
    int           i_int;

    switch( i_query )
    {
        case STREAM_CAN_SEEK:
            pb_bool = va_arg( args, bool * );
            *pb_bool = p_sys->b_seekable;
            break;

        case STREAM_CAN_FASTSEEK:
            pb_bool = va_arg( args, bool * );
            *pb_bool = false;
            break;

        case STREAM_CAN_PAUSE:
            pb_bool = va_arg( args, bool * );
            *pb_bool = true;
            break;

        case STREAM_CAN_CONTROL_PACE:
            pb_bool = va_arg( args, bool * );

#if 0       /* Disable for now until we have a clock synchro algo
             * which works with something else than MPEG over UDP */
            *pb_bool = false;
#endif
            *pb_bool = true;
            break;

        case STREAM_GET_SIZE:
            if( !p_sys->b_seekable )
                return VLC_EGENERIC;
            *va_arg( args, uint64_t * ) = p_sys->i_size;
            break;

        case STREAM_GET_PTS_DELAY:
            pi_64 = va_arg( args, int64_t * );
            *pi_64 = INT64_C(1000)
                   * var_InheritInteger( p_access, "network-caching" );
            break;

        case STREAM_GET_PRIVATE_ID_STATE:
            i_int = va_arg( args, int );
            pb_bool = (bool *)va_arg( args, bool * );

            if( i_int < 0 || i_int > 127 )
                return VLC_EGENERIC;
            *pb_bool =  p_sys->asfh.stream[i_int].i_selected ? true : false;
            break;

        case STREAM_SET_PRIVATE_ID_STATE:
        {
            i_int = va_arg( args, int );
            b_bool = (bool)va_arg( args, int );
            int i_cat;
            if( i_int > 127 )
                return VLC_EGENERIC;
            else if ( i_int < 0 )
            {
                /* Deselecting all ES in this category */
                assert( !b_bool );
                i_cat = -1 * i_int;
                if ( i_cat > ES_CATEGORY_COUNT )
                    return VLC_EGENERIC;
            }
            else
            {
                /* Chose another ES */
                assert( b_bool );
                i_cat = p_sys->asfh.stream[i_int].i_cat;
            }

            for ( int i=0; i< 128; i++ )
            {
                /* First unselect all streams from the same cat */
                if ( i_cat == p_sys->asfh.stream[i].i_cat )
                    p_sys->asfh.stream[i].i_selected = false;
            }

            if ( i_int > 0 )
                p_sys->asfh.stream[i_int].i_selected = true;

            MMSStop( p_access );
            Seek( p_access, p_sys->i_position );
            return VLC_SUCCESS;
        }

        case STREAM_SET_PAUSE_STATE:
            b_bool = (bool)va_arg( args, int );
            if( b_bool )
            {
                MMSStop( p_access );
                KeepAliveStart( p_access );
            }
            else
            {
                KeepAliveStop( p_access );
                Seek( p_access, p_sys->i_position );
            }
            break;

        default:
            return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Seek: try to go at the right place
 *****************************************************************************/
static int Seek( stream_t * p_access, uint64_t i_pos )
{
    access_sys_t *p_sys = p_access->p_sys;
    uint32_t    i_packet;
    uint32_t    i_offset;
    var_buffer_t buffer;

    if( i_pos < p_sys->i_header)
    {
        if( p_sys->i_position < p_sys->i_header )
        {
            /* no need to restart stream, it was already one
             * or no stream was yet read */
            p_sys->i_position = i_pos;
            return VLC_SUCCESS;
        }
        else
        {
            i_packet = 0xffffffff;
            i_offset = 0;
        }
    }
    else
    {
        i_packet = ( i_pos - p_sys->i_header ) / p_sys->i_packet_length;
        i_offset = ( i_pos - p_sys->i_header ) % p_sys->i_packet_length;
    }
    if( p_sys->b_seekable && i_packet >= p_sys->i_packet_count )
        return VLC_EGENERIC;

    msg_Dbg( p_access, "seeking to %"PRIu64 " (packet:%u)", i_pos, i_packet );

    MMSStop( p_access );
    msg_Dbg( p_access, "stream stopped (seek)" );

    /* *** restart stream *** */
    var_buffer_initwrite( &buffer, 0 );
    var_buffer_add64( &buffer, 0 ); /* seek point in second */
    var_buffer_add32( &buffer, 0xffffffff );
    var_buffer_add32( &buffer, i_packet ); // begin from start
    var_buffer_add8( &buffer, 0xff ); // stream time limit
    var_buffer_add8( &buffer, 0xff ); //  on 3bytes ...
    var_buffer_add8( &buffer, 0xff ); //
    var_buffer_add8( &buffer, 0x00 ); // don't use limit
    var_buffer_add32( &buffer, p_sys->i_media_packet_id_type );

    mms_CommandSend( p_access, 0x07, p_sys->i_command_level, 0x0001ffff,
                     buffer.p_data, buffer.i_data );

    var_buffer_free( &buffer );


    for( ;; )
    {
        if( mms_HeaderMediaRead( p_access, MMS_PACKET_CMD ) < 0 )
        {
            p_sys->b_eof = true;
            return VLC_EGENERIC;
        }

        if( p_sys->i_command == 0x1e )
        {
            msg_Dbg( p_access, "received 0x1e (seek)" );
            break;
        }
    }

    for( ;; )
    {
        if( mms_HeaderMediaRead( p_access, MMS_PACKET_CMD ) < 0 )
        {
            p_sys->b_eof = true;
            return VLC_EGENERIC;
        }
        if( p_sys->i_command == 0x05 )
        {
            msg_Dbg( p_access, "received 0x05 (seek)" );
            break;
        }
    }

    /* get a packet */
    if( mms_HeaderMediaRead( p_access, MMS_PACKET_MEDIA ) < 0 )
    {
        p_sys->b_eof = true;
        return VLC_EGENERIC;
    }

    msg_Dbg( p_access, "Streaming restarted" );

    p_sys->i_media_used += i_offset;
    p_sys->i_position = i_pos;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Block:
 *****************************************************************************/
static block_t *Block( stream_t *p_access, bool *restrict eof )
{
    access_sys_t *p_sys = p_access->p_sys;

    if( p_sys->b_eof )
    {
        *eof = true;
        return NULL;
    }

    if( p_sys->i_position < p_sys->i_header )
    {
        const size_t i_copy = p_sys->i_header - p_sys->i_position;

        block_t *p_block = block_Alloc( i_copy );
        if( !p_block )
            return NULL;

        memcpy( p_block->p_buffer, &p_sys->p_header[p_sys->i_position], i_copy );
        p_sys->i_position += i_copy;
        return p_block;
    }
    else if( p_sys->p_media && p_sys->i_media_used < __MAX( p_sys->i_media, p_sys->i_packet_length ) )
    {
        size_t i_copy = 0;
        size_t i_padding = 0;

        if( p_sys->i_media_used < p_sys->i_media )
            i_copy = p_sys->i_media - p_sys->i_media_used;
        if( __MAX( p_sys->i_media, p_sys->i_media_used ) < p_sys->i_packet_length )
            i_padding = p_sys->i_packet_length - __MAX( p_sys->i_media, p_sys->i_media_used );

        block_t *p_block = block_Alloc( i_copy + i_padding );
        if( !p_block )
            return NULL;

        if( i_copy > 0 )
            memcpy( &p_block->p_buffer[0], &p_sys->p_media[p_sys->i_media_used], i_copy );
        if( i_padding > 0 )
            memset( &p_block->p_buffer[i_copy], 0, i_padding );

        p_sys->i_media_used += i_copy + i_padding;
        p_sys->i_position += i_copy + i_padding;
        return p_block;
    }

    mms_HeaderMediaRead( p_access, MMS_PACKET_MEDIA );
    return NULL;
}

/****************************************************************************
 * MMSOpen : Open a connection with the server over mmst or mmsu
 ****************************************************************************/
static int MMSOpen( stream_t  *p_access, vlc_url_t *p_url, int  i_proto )
{
    access_sys_t *p_sys = p_access->p_sys;
    int           b_udp = ( i_proto == MMS_PROTO_UDP ) ? 1 : 0;

    var_buffer_t buffer;
    char         *tmp;
    const uint8_t *p;
    const uint8_t *p_cmdend;
    uint32_t     i_server_version;
    uint32_t     i_tool_version;
    uint32_t     i_update_player_url;
    uint32_t     i_encryption_type;
    int          i_streams;
    int          i_first;
    char         *mediapath;


    /* *** Open a TCP connection with server *** */
    msg_Dbg( p_access, "waiting for connection..." );
    p_sys->i_handle_tcp = net_ConnectTCP( p_access, p_url->psz_host, p_url->i_port );
    if( p_sys->i_handle_tcp < 0 )
    {
        msg_Err( p_access, "failed to open a connection (tcp)" );
        return VLC_EGENERIC;
    }
    msg_Dbg( p_access,
             "connection(tcp) with \"%s:%d\" successful",
             p_url->psz_host,
             p_url->i_port );

    /* *** Bind port if UDP protocol is selected *** */
    if( b_udp )
    {
        if( net_GetSockAddress( p_sys->i_handle_tcp, p_sys->sz_bind_addr,
                                NULL ) )
        {
            net_Close( p_sys->i_handle_tcp );
            return VLC_EGENERIC;
        }

        p_sys->i_handle_udp = net_ListenUDP1( (vlc_object_t *)p_access, p_sys->sz_bind_addr,
                                              7000 );
        if( p_sys->i_handle_udp < 0 )
        {
            msg_Err( p_access, "failed to open a connection (udp)" );
            net_Close( p_sys->i_handle_tcp );
            return VLC_EGENERIC;
        }
        msg_Dbg( p_access,
                 "connection(udp) at \"%s:%d\" successful",
                 p_sys->sz_bind_addr, 7000 );
    }

    /* *** Init context for mms prototcol *** */
     GenerateGuid ( &p_sys->guid );    /* used to identify client by server */
    msg_Dbg( p_access,
             "generated guid: "GUID_FMT,
             GUID_PRINT( p_sys->guid ) );
    p_sys->i_command_level = 1;          /* updated after 0x1A command */
    p_sys->i_seq_num = 0;
    p_sys->i_media_packet_id_type  = 0x04;
    p_sys->i_header_packet_id_type = 0x02;
    p_sys->i_proto = i_proto;
    p_sys->i_packet_seq_num = 0;
    p_sys->p_header = NULL;
    p_sys->i_header = 0;
    p_sys->p_media = NULL;
    p_sys->i_media = 0;
    p_sys->i_media_used = 0;

    p_sys->i_position = 0;
    p_sys->i_buffer_tcp = 0;
    p_sys->i_buffer_udp = 0;
    p_sys->p_cmd = NULL;
    p_sys->i_cmd = 0;
    p_sys->b_eof = false;

    /* *** send command 1 : connection request *** */
    var_buffer_initwrite( &buffer, 0 );
    var_buffer_add16( &buffer, 0x001c );
    var_buffer_add16( &buffer, 0x0003 );
    if( asprintf( &tmp,
             "NSPlayer/7.0.0.1956; {"GUID_FMT"}; Host: %s",
             GUID_PRINT( p_sys->guid ),
             p_url->psz_host ) < 0 )
    {
        var_buffer_free( &buffer );
        net_Close( p_sys->i_handle_tcp );
        return VLC_ENOMEM;
    }

    var_buffer_addUTF16( p_access, &buffer, tmp );
    free( tmp );

    mms_CommandSend( p_access,
                     0x01,          /* connexion request */
                     0x00000000,    /* flags, FIXME */
                     0x0004000b,    /* ???? */
                     buffer.p_data,
                     buffer.i_data );

    if( mms_CommandRead( p_access, 0x01, 0 ) < 0 || p_sys->i_cmd < MMS_CMD_HEADERSIZE + 48 )
    {
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return VLC_EGENERIC;
    }

    i_server_version = GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 32 );
    i_tool_version = GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 36 );
    i_update_player_url = GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 40 );
    i_encryption_type = GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 44 );
    p = p_sys->p_cmd + MMS_CMD_HEADERSIZE + 48;
    p_cmdend = &p_sys->p_cmd[p_sys->i_cmd];

#define GETUTF16( fmt, size ) \
do \
{ \
    if( (p_cmdend - p) / 2u < (size) ) \
    {\
        var_buffer_free( &buffer );\
        MMSClose( p_access );\
        return VLC_EBADVAR;\
    }\
    char *str = FromCharset( "UTF-16LE", p, (size) * 2 ); \
    p += (size) * 2; \
    if( str != NULL ) \
    { \
        msg_Dbg( p_access, fmt " %s", str ); \
        free( str ); \
    } \
} while (0)

    GETUTF16( "server version:   ", i_server_version );
    GETUTF16( "tool version:     ", i_tool_version );
    GETUTF16( "update player URL:", i_update_player_url );
    GETUTF16( "encryption type:  ", i_encryption_type );
#undef GETUTF16

    /* *** should make an 18 command to make data timing *** */

    /* *** send command 2 : transport protocol selection *** */
    var_buffer_reinitwrite( &buffer, 0 );
    var_buffer_add32( &buffer, 0x00000000 );
    var_buffer_add32( &buffer, 0x000a0000 );
    var_buffer_add32( &buffer, 0x00000002 );
    if( b_udp )
    {
        if( asprintf( &tmp,
                    "\\\\%s\\UDP\\%d",
                    p_sys->sz_bind_addr,
                    7000 ) < 0) // FIXME
        {
            var_buffer_free( &buffer );
            MMSClose( p_access );
            return VLC_EGENERIC;
        }
    }
    else
    {
        if( asprintf( &tmp, "\\\\192.168.0.1\\TCP\\1242" ) < 0 )
        {
            var_buffer_free( &buffer );
            MMSClose( p_access );
            return VLC_EGENERIC;
        }
    }
    var_buffer_addUTF16( p_access, &buffer, tmp );
    var_buffer_add16( &buffer, '0' );
    free( tmp );

    mms_CommandSend( p_access,
                     0x02,          /* connexion request */
                     0x00000000,    /* flags, FIXME */
                     0xffffffff,    /* ???? */
                     buffer.p_data,
                     buffer.i_data );

    /* *** response from server, should be 0x02 or 0x03 *** */
    mms_CommandRead( p_access, 0x02, 0x03 );
    if( p_sys->i_command == 0x03 )
    {
        msg_Err( p_access,
                 "%s protocol selection failed", b_udp ? "UDP" : "TCP" );
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return VLC_EGENERIC;
    }
    else if( p_sys->i_command != 0x02 )
    {
        msg_Warn( p_access, "received command isn't 0x02 in response to 0x02" );
    }

    /* *** send command 5 : media file name/path requested *** */
    var_buffer_reinitwrite( &buffer, 0 );
    var_buffer_add64( &buffer, 0 );

    /* media file path shouldn't start with / character */
    mediapath = p_url->psz_path;
    if ( mediapath && *mediapath == '/' )
    {
        mediapath++;
    }
    var_buffer_addUTF16( p_access, &buffer, mediapath );

    mms_CommandSend( p_access,
                     0x05,
                     p_sys->i_command_level,
                     0xffffffff,
                     buffer.p_data,
                     buffer.i_data );

    /* *** wait for response *** */
    mms_CommandRead( p_access, 0x1a, 0x06 );

    /* test if server send 0x1A answer */
    if( p_sys->i_command == 0x1A )
    {
        msg_Err( p_access, "id/password requested (not yet supported)" );
        /*  FIXME */
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return VLC_EGENERIC;
    }
    if( p_sys->i_command != 0x06 )
    {
        msg_Err( p_access,
                 "unknown answer (0x%x instead of 0x06)",
                 p_sys->i_command );
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return( -1 );
    }

    if( p_sys->i_cmd < MMS_CMD_HEADERSIZE + 64 )
    {
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return VLC_EBADVAR;
    }

    /*  1 for file ok, 2 for authen ok */
    switch( GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE ) )
    {
        case 0x0001:
            msg_Dbg( p_access, "media file name/path accepted" );
            break;
        case 0x0002:
            msg_Dbg( p_access, "authentication accepted" );
            break;
        case -1:
        default:
        msg_Err( p_access, "error while asking for file %d",
                 GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE ) );
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return VLC_EGENERIC;
    }

    p_sys->i_flags_broadcast =
        GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 12 );
    p_sys->i_media_length =
        GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 24 );
    p_sys->i_packet_length =
        GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 44 );
    p_sys->i_packet_count =
        GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 48 );
    p_sys->i_max_bit_rate =
        GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 56 );
    p_sys->i_header_size =
        GetDWLE( p_sys->p_cmd + MMS_CMD_HEADERSIZE + 60 );

    msg_Dbg( p_access,
             "answer 0x06 flags:0x%8.8"PRIx32" media_length:%"PRIu32"s "
             "packet_length:%zu packet_count:%"PRIu32" max_bit_rate:%"PRIu32
             "header_size:%zu",
             p_sys->i_flags_broadcast,
             p_sys->i_media_length,
             p_sys->i_packet_length,
             p_sys->i_packet_count,
             p_sys->i_max_bit_rate,
             p_sys->i_header_size );

    /* *** send command 15 *** */

    var_buffer_reinitwrite( &buffer, 0 );
    var_buffer_add32( &buffer, 0 );
    var_buffer_add32( &buffer, 0x8000 );
    var_buffer_add32( &buffer, 0xffffffff );
    var_buffer_add32( &buffer, 0x00 );
    var_buffer_add32( &buffer, 0x00 );
    var_buffer_add32( &buffer, 0x00 );
    var_buffer_add64( &buffer, (((uint64_t)0x40ac2000)<<32) );
    var_buffer_add32( &buffer, p_sys->i_header_packet_id_type );
    var_buffer_add32( &buffer, 0x00 );
    mms_CommandSend( p_access, 0x15, p_sys->i_command_level, 0x00,
                     buffer.p_data, buffer.i_data );

    /* *** wait for response *** */
    /* Commented out because it fails on some stream (no 0x11 answer) */
#if 0
    mms_CommandRead( p_access, 0x11, 0 );

    if( p_sys->i_command != 0x11 )
    {
        msg_Err( p_access,
                 "unknown answer (0x%x instead of 0x11)",
                 p_sys->i_command );
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return( -1 );
    }
#endif

    /* *** now read header packet *** */
    /* XXX could be split over multiples packets */
    msg_Dbg( p_access, "reading header" );
    for( ;; )
    {
        if( mms_HeaderMediaRead( p_access, MMS_PACKET_HEADER ) < 0 )
        {
            msg_Err( p_access, "cannot receive header" );
            var_buffer_free( &buffer );
            MMSClose( p_access );
            return VLC_EGENERIC;
        }
        if( p_sys->i_header >= p_sys->i_header_size )
        {
            msg_Dbg( p_access,
                     "header complete(%zu)",
                     p_sys->i_header );
            break;
        }
        msg_Dbg( p_access,
                 "header incomplete (%zu/%zu), reading more",
                 p_sys->i_header,
                 p_sys->i_header_size );
    }

    /* *** parse header and get stream and their id *** */
    /* get all streams properties,
     *
     * TODO : stream bitrates properties(optional)
     *        and bitrate mutual exclusion(optional) */
     asf_HeaderParse ( &p_sys->asfh,
                           p_sys->p_header, p_sys->i_header );
     asf_StreamSelect( &p_sys->asfh,
                           var_InheritInteger( p_access, "mms-maxbitrate" ),
                           var_InheritBool( p_access, "mms-all" ),
                           var_InheritBool( p_access, "audio" ),
                           var_InheritBool( p_access, "video" ) );

    /* *** now select stream we want to receive *** */
    /* TODO take care of stream bitrate TODO */
    i_streams = 0;
    i_first = -1;
    var_buffer_reinitwrite( &buffer, 0 );
    /* for now, select first audio and video stream */
    for( int i = 1; i < 128; i++ )
    {

        if( p_sys->asfh.stream[i].i_cat != ASF_CODEC_TYPE_UNKNOWN )
        {
            i_streams++;
            if( i_first != -1 )
            {
                var_buffer_add16( &buffer, 0xffff );
                var_buffer_add16( &buffer, i );
            }
            else
            {
                i_first = i;
            }
            if( p_sys->asfh.stream[i].i_selected )
            {
                var_buffer_add16( &buffer, 0x0000 );
                msg_Info( p_access,
                          "selecting stream[0x%x] %s (%d Kib/s)",
                          i,
                          ( p_sys->asfh.stream[i].i_cat == ASF_CODEC_TYPE_AUDIO  ) ?
                                                  "audio" : "video" ,
                          p_sys->asfh.stream[i].i_bitrate / 1024);
            }
            else
            {
                var_buffer_add16( &buffer, 0x0002 );
                msg_Info( p_access,
                          "ignoring stream[0x%x] %s (%d Kib/s)",
                          i,
                          ( p_sys->asfh.stream[i].i_cat == ASF_CODEC_TYPE_AUDIO  ) ?
                                    "audio" : "video" ,
                          p_sys->asfh.stream[i].i_bitrate / 1024);

            }
        }
    }

    if( i_streams == 0 )
    {
        msg_Err( p_access, "cannot find any stream" );
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return VLC_EGENERIC;
    }
    mms_CommandSend( p_access, 0x33,
                     i_streams,
                     0xffff | ( i_first << 16 ),
                     buffer.p_data, buffer.i_data );

    mms_CommandRead( p_access, 0x21, 0 );
    if( p_sys->i_command != 0x21 )
    {
        msg_Err( p_access,
                 "unknown answer (0x%x instead of 0x21)",
                 p_sys->i_command );
        var_buffer_free( &buffer );
        MMSClose( p_access );
        return VLC_EGENERIC;
    }


    var_buffer_free( &buffer );

    msg_Info( p_access, "connection successful" );

    return VLC_SUCCESS;
}

/****************************************************************************
 * MMSStart : Start streaming
 ****************************************************************************/
static int MMSStart( stream_t  *p_access, uint32_t i_packet )
{
    access_sys_t        *p_sys = p_access->p_sys;
    var_buffer_t    buffer;

    /* *** start stream from packet 0 *** */
    var_buffer_initwrite( &buffer, 0 );
    var_buffer_add64( &buffer, 0 ); /* seek point in second */
    var_buffer_add32( &buffer, 0xffffffff );
    var_buffer_add32( &buffer, i_packet ); // begin from start
    var_buffer_add8( &buffer, 0xff ); // stream time limit
    var_buffer_add8( &buffer, 0xff ); //  on 3bytes ...
    var_buffer_add8( &buffer, 0xff ); //
    var_buffer_add8( &buffer, 0x00 ); // don't use limit
    var_buffer_add32( &buffer, p_sys->i_media_packet_id_type );

    mms_CommandSend( p_access, 0x07, p_sys->i_command_level, 0x0001ffff,
                     buffer.p_data, buffer.i_data );

    var_buffer_free( &buffer );

    mms_CommandRead( p_access, 0x05, 0 );

    if( p_sys->i_command != 0x05 )
    {
        msg_Err( p_access,
                 "unknown answer (0x%x instead of 0x05)",
                 p_sys->i_command );
        return -1;
    }
    else
    {
        /* get a packet */
        if( mms_HeaderMediaRead( p_access, MMS_PACKET_MEDIA ) < 0 )
            return -1;
        msg_Dbg( p_access, "streaming started" );
        return 0;
    }
}

/****************************************************************************
 * MMSStop : Stop streaming
 ****************************************************************************/
static int MMSStop( stream_t  *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;

    /* *** stop stream but keep connection alive *** */
    mms_CommandSend( p_access,
                     0x09,
                     p_sys->i_command_level,
                     0x001fffff,
                     NULL, 0 );
    return( 0 );
}

/****************************************************************************
 * MMSClose : Close streaming and connection
 ****************************************************************************/
static void MMSClose( stream_t  *p_access )
{
    access_sys_t        *p_sys = p_access->p_sys;

    msg_Dbg( p_access, "Connection closed" );

    /* *** tell server that we will disconnect *** */
    mms_CommandSend( p_access,
                     0x0d,
                     p_sys->i_command_level,
                     0x00000001,
                     NULL, 0 );

    /* *** close sockets *** */
    net_Close( p_sys->i_handle_tcp );
    if( p_sys->i_proto == MMS_PROTO_UDP )
    {
        net_Close( p_sys->i_handle_udp );
    }

    FREENULL( p_sys->p_cmd );
    FREENULL( p_sys->p_media );
    FREENULL( p_sys->p_header );
    p_sys->i_header = 0;
}

/****************************************************************************
 *
 * MMS specific functions
 *
 ****************************************************************************/
static int mms_CommandSend( stream_t *p_access, int i_command,
                            uint32_t i_prefix1, uint32_t i_prefix2,
                            uint8_t *p_data, int i_data_old )
{
    var_buffer_t buffer;
    access_sys_t *p_sys = p_access->p_sys;
    int i_data_by8, i_ret;
    int i_data = i_data_old;

    while( i_data & 0x7 ) i_data++;
    i_data_by8 = i_data >> 3;

    /* first init buffer */
    var_buffer_initwrite( &buffer, 0 );

    var_buffer_add32( &buffer, 0x00000001 );    /* start sequence */
    var_buffer_add32( &buffer, 0xB00BFACE );
    /* size after protocol type */
    var_buffer_add32( &buffer, i_data + MMS_CMD_HEADERSIZE - 16 );
    var_buffer_add32( &buffer, 0x20534d4d );    /* protocol "MMS " */
    var_buffer_add32( &buffer, i_data_by8 + 4 );
    var_buffer_add32( &buffer, p_sys->i_seq_num ); p_sys->i_seq_num++;
    var_buffer_add64( &buffer, 0 );
    var_buffer_add32( &buffer, i_data_by8 + 2 );
    var_buffer_add32( &buffer, 0x00030000 | i_command ); /* dir | command */
    var_buffer_add32( &buffer, i_prefix1 );    /* command specific */
    var_buffer_add32( &buffer, i_prefix2 );    /* command specific */

    /* specific command data */
    if( p_data && i_data > 0 )
    {
        var_buffer_addmemory( &buffer, p_data, i_data_old );
    }

    /* Append padding to the command data */
    var_buffer_add64( &buffer, 0 );

    /* send it */
    vlc_mutex_lock( &p_sys->lock_netwrite );
    i_ret = net_Write( p_access, p_sys->i_handle_tcp, buffer.p_data,
                       buffer.i_data - ( 8 - ( i_data - i_data_old ) ) );
    vlc_mutex_unlock( &p_sys->lock_netwrite );

    if( i_ret != buffer.i_data - ( 8 - ( i_data - i_data_old ) ) )
    {
        var_buffer_free( &buffer );
        msg_Err( p_access, "failed to send command" );
        return VLC_EGENERIC;
    }

    var_buffer_free( &buffer );
    return VLC_SUCCESS;
}

static int NetFillBuffer( stream_t *p_access )
{
    access_sys_t    *p_sys = p_access->p_sys;
    int             i_ret;
    struct pollfd   ufd[2];
    unsigned        timeout = p_sys->i_timeout, nfd = 0;

    /* FIXME when using udp */
    ssize_t i_tcp, i_udp;
    ssize_t i_tcp_read, i_udp_read;

    i_tcp = MMS_BUFFER_SIZE/2 - p_sys->i_buffer_tcp;

    if( p_sys->i_proto == MMS_PROTO_UDP )
    {
        i_udp = MMS_BUFFER_SIZE/2 - p_sys->i_buffer_udp;
    }
    else
    {
        i_udp = 0;  /* there isn't udp socket */
    }

    if( ( i_udp <= 0 ) && ( i_tcp <= 0 ) )
    {
        msg_Warn( p_access, "nothing to read %d:%d", (int)i_tcp, (int)i_udp );
        return 0;
    }
    else
    {
        /* msg_Warn( p_access, "ask for tcp:%d udp:%d", i_tcp, i_udp ); */
    }

    /* Initialize file descriptor set */
    if( i_tcp > 0 )
    {
        ufd[nfd].fd = p_sys->i_handle_tcp;
        ufd[nfd].events = POLLIN;
        nfd++;
    }
    if( i_udp > 0 )
    {
        ufd[nfd].fd = p_sys->i_handle_udp;
        ufd[nfd].events = POLLIN;
        nfd++;
    }

    /* Find if some data is available */
    if( p_sys->i_buffer_tcp > 0 || p_sys->i_buffer_udp > 0 )
        timeout = 2000;

    do
    {
        if( vlc_killed() )
            return -1;

        i_ret = vlc_poll_i11e(ufd, nfd, timeout);
    }
    while( i_ret < 0 && errno == EINTR ); /* FIXME: recompute timeout */

    if( i_ret == 0 )
    {
        msg_Err(p_access, "no data received");
        return -1;
    }

    if( i_ret < 0 )
    {
        msg_Err( p_access, "network poll error: %s", vlc_strerror_c(errno) );
        return -1;
    }

    i_tcp_read = i_udp_read = 0;

    if( ( i_tcp > 0 ) && ufd[0].revents )
    {
        i_tcp_read =
            recv( p_sys->i_handle_tcp,
                  p_sys->buffer_tcp + p_sys->i_buffer_tcp,
                  MMS_BUFFER_SIZE - p_sys->i_buffer_tcp, 0 );
    }

    if( i_udp > 0 && ufd[i_tcp > 0].revents )
    {
        i_udp_read = recv( p_sys->i_handle_udp,
                           p_sys->buffer_udp + p_sys->i_buffer_udp,
                           MMS_BUFFER_SIZE - p_sys->i_buffer_udp, 0 );
    }

#ifdef MMS_DEBUG
    if( p_sys->i_proto == MMS_PROTO_UDP )
    {
        msg_Dbg( p_access, "filling buffer TCP:%d+%d UDP:%d+%d",
                 p_sys->i_buffer_tcp, i_tcp_read,
                 p_sys->i_buffer_udp, i_udp_read );
    }
    else
    {
        msg_Dbg( p_access, "filling buffer TCP:%d+%d",
                 p_sys->i_buffer_tcp, i_tcp_read );
    }
#endif

    if( i_tcp_read > 0 ) p_sys->i_buffer_tcp += (size_t) i_tcp_read;
    if( i_udp_read > 0 ) p_sys->i_buffer_udp += (size_t) i_udp_read;

    return i_tcp_read + i_udp_read;
}

static int  mms_ParseCommand( stream_t *p_access,
                              uint8_t *p_data,
                              size_t i_data,
                              size_t *pi_used )
{
 #define GET32( i_pos ) \
    ( p_sys->p_cmd[i_pos] + ( p_sys->p_cmd[i_pos +1] << 8 ) + \
      ( p_sys->p_cmd[i_pos + 2] << 16 ) + \
      ( p_sys->p_cmd[i_pos + 3] << 24 ) )

    access_sys_t        *p_sys = p_access->p_sys;
    uint32_t    i_length;
    uint32_t    i_id;

    free( p_sys->p_cmd );
    p_sys->p_cmd = NULL;
    p_sys->i_cmd = 0;
    p_sys->i_command = 0;
    *pi_used = 0;
    if( i_data < MMS_CMD_HEADERSIZE )
    {
        msg_Warn( p_access, "truncated command (header incomplete)" );
        return -1;
    }
    i_id =  GetDWLE( p_data + 4 );
    i_length = GetDWLE( p_data + 8 ) + 16;

    if( i_id != 0xb00bface || i_length < 16 )
    {
        msg_Err( p_access,
                 "incorrect command header (0x%"PRIx32")", i_id );
        return -1;
    }

    if( i_length > i_data )
    {
        msg_Warn( p_access,
                  "truncated command (missing %zu bytes)",
                   (size_t)i_length - i_data  );
        return -1;
    }

    if( (p_sys->p_cmd = malloc( i_length )) )
    {
        memcpy( p_sys->p_cmd, p_data, i_length );
    }
    else
    {
        return -1;
    }
    p_sys->i_cmd = i_length;
    *pi_used = i_length;

    msg_Dbg( p_access,
             "recv command start_sequence:0x%8.8x command_id:0x%8.8x length:%d len8:%d sequence 0x%8.8x len8_II:%d dir_comm:0x%8.8x",
             GET32( 0 ),
             GET32( 4 ),
             GET32( 8 ),
             /* 12: protocol type "MMS " */
             GET32( 16 ),
             GET32( 20 ),
             /* 24: unknown (0) */
             /* 28: unknown (0) */
             GET32( 32 ),
             GET32( 36 )
             /* 40: switches */
             /* 44: extra */ );

    p_sys->i_command = GET32( 36 ) & 0xffff;
#undef GET32

    return MMS_PACKET_CMD;
}

static int  mms_ParsePacket( stream_t *p_access,
                             const uint8_t *p_data, size_t i_data,
                             size_t *pi_used )
{
    access_sys_t        *p_sys = p_access->p_sys;
    int i_packet_seq_num;
    size_t i_packet_length;
    uint32_t i_packet_id;

    *pi_used = i_data; /* default */
    if( i_data <= 8 )
    {
        msg_Warn( p_access, "truncated packet (header incomplete)" );
        return -1;
    }

    i_packet_id = p_data[4];
    i_packet_seq_num = GetDWLE( p_data );
    i_packet_length = GetWLE( p_data + 6 );

    //msg_Warn( p_access, "------->i_packet_length=%d, i_data=%d", i_packet_length, i_data );

    if( i_packet_length > i_data || i_packet_length <= 8)
    {
     /*   msg_Dbg( p_access,
                 "truncated packet (Declared %d bytes, Actual %d bytes)",
                 i_packet_length, i_data  ); */
        *pi_used = 0;
        return -1;
    }
    else if( i_packet_length < i_data )
    {
        *pi_used = i_packet_length;
    }

    if( i_packet_id == 0xff )
    {
        msg_Warn( p_access,
                  "receive MMS UDP pair timing" );
        return( MMS_PACKET_UDP_TIMING );
    }

    if( i_packet_id != p_sys->i_header_packet_id_type &&
        i_packet_id != p_sys->i_media_packet_id_type )
    {
        msg_Warn( p_access, "incorrect Packet Id Type (0x%x)", i_packet_id );
        return -1;
    }

    /* we now have a media or a header packet */
    if( i_packet_seq_num != p_sys->i_packet_seq_num )
    {
#if 0
        /* FIXME for udp could be just wrong order ? */
        msg_Warn( p_access,
                  "detected packet lost (%d != %d)",
                  i_packet_seq_num,
                  p_sys->i_packet_seq_num );
#endif
    }
    p_sys->i_packet_seq_num = i_packet_seq_num + 1;
    i_packet_length -= 8; // don't bother with preheader

    if( i_packet_id == p_sys->i_header_packet_id_type )
    {
        size_t new_header_size;
        if( add_overflow( p_sys->i_header, i_packet_length, &new_header_size ) )
            return -1;
        uint8_t *p_reaced = realloc( p_sys->p_header, new_header_size );
        if( !p_reaced )
            return -1;

        memcpy( &p_reaced[p_sys->i_header], p_data + 8, i_packet_length );
        p_sys->p_header = p_reaced;
        p_sys->i_header = new_header_size;

/*        msg_Dbg( p_access,
                 "receive header packet (%d bytes)",
                 i_packet_length ); */

        return MMS_PACKET_HEADER;
    }
    else
    {
        free( p_sys->p_media );
        p_sys->i_media = 0;
        p_sys->i_media_used = 0;

        p_sys->p_media = malloc( i_packet_length );
        if( !p_sys->p_media )
            return -1;

        p_sys->i_media = i_packet_length;
        memcpy( p_sys->p_media, p_data + 8, p_sys->i_media );
/*        msg_Dbg( p_access,
                 "receive media packet (%d bytes)",
                 i_packet_length ); */

        return MMS_PACKET_MEDIA;
    }
}

static int mms_ReceivePacket( stream_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;
    int i_packet_tcp_type;
    int i_packet_udp_type;

    for( ;; )
    {
        bool b_refill = true;

        /* first if we need to refill buffer */
        if( p_sys->i_buffer_tcp >= MMS_CMD_HEADERSIZE )
        {
            if( GetDWLE( p_sys->buffer_tcp + 4 ) == 0xb00bface  )
            {
                if( GetDWLE( p_sys->buffer_tcp + 8 ) + 16 <=
                    (size_t)p_sys->i_buffer_tcp )
                {
                    b_refill = false;
                }
            }
            else if( GetWLE( p_sys->buffer_tcp + 6 ) <= p_sys->i_buffer_tcp )
            {
                b_refill = false;
            }
        }
        if( p_sys->i_proto == MMS_PROTO_UDP && p_sys->i_buffer_udp >= 8 &&
            GetWLE( p_sys->buffer_udp + 6 ) <= p_sys->i_buffer_udp )
        {
            b_refill = false;
        }

        if( b_refill && NetFillBuffer( p_access ) < 0 )
        {
            msg_Warn( p_access, "cannot fill buffer" );
            return -1;
        }

        i_packet_tcp_type = -1;
        i_packet_udp_type = -1;

        if( p_sys->i_buffer_tcp > 0 )
        {
            size_t i_used;

            if( GetDWLE( p_sys->buffer_tcp + 4 ) == 0xb00bface )
            {
                i_packet_tcp_type =
                    mms_ParseCommand( p_access, p_sys->buffer_tcp,
                                      p_sys->i_buffer_tcp, &i_used );

            }
            else
            {
                i_packet_tcp_type =
                    mms_ParsePacket( p_access, p_sys->buffer_tcp,
                                     p_sys->i_buffer_tcp, &i_used );
            }
            if( i_used > 0 && i_used < MMS_BUFFER_SIZE )
            {
                memmove( p_sys->buffer_tcp, p_sys->buffer_tcp + i_used,
                         MMS_BUFFER_SIZE - i_used );
            }
            p_sys->i_buffer_tcp -= i_used;
        }
        else if( p_sys->i_buffer_udp > 0 )
        {
            size_t i_used;

            i_packet_udp_type =
                mms_ParsePacket( p_access, p_sys->buffer_udp,
                                 p_sys->i_buffer_udp, &i_used );

            if( i_used > 0 && i_used < MMS_BUFFER_SIZE )
            {
                memmove( p_sys->buffer_udp, p_sys->buffer_udp + i_used,
                         MMS_BUFFER_SIZE - i_used );
            }
            p_sys->i_buffer_udp -= i_used;
        }

        if( i_packet_tcp_type == MMS_PACKET_CMD && p_sys->i_command == 0x1b )
        {
            mms_CommandSend( p_access, 0x1b, 0, 0, NULL, 0 );
            i_packet_tcp_type = -1;
        }

        if( i_packet_tcp_type != -1 )
        {
            return i_packet_tcp_type;
        }
        else if( i_packet_udp_type != -1 )
        {
            return i_packet_udp_type;
        }
    }
}

static int mms_ReceiveCommand( stream_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;

    for( ;; )
    {
        size_t i_used;
        int i_status;

        if( NetFillBuffer( p_access ) < 0 )
        {
            msg_Warn( p_access, "cannot fill buffer" );
            return VLC_EGENERIC;
        }
        if( p_sys->i_buffer_tcp > 0 )
        {
            i_status = mms_ParseCommand( p_access, p_sys->buffer_tcp,
                                         p_sys->i_buffer_tcp, &i_used );
            if( i_used < MMS_BUFFER_SIZE )
            {
                memmove( p_sys->buffer_tcp, p_sys->buffer_tcp + i_used,
                         MMS_BUFFER_SIZE - i_used );
            }
            p_sys->i_buffer_tcp -= i_used;

            if( i_status < 0 )
            {
                return VLC_EGENERIC;
            }

            if( p_sys->i_command == 0x1b )
            {
                mms_CommandSend( p_access, 0x1b, 0, 0, NULL, 0 );
            }
            else
            {
                break;
            }
        }
        else
        {
            return VLC_EGENERIC;
        }
    }

    return VLC_SUCCESS;
}

#define MMS_RETRY_MAX       10

static int mms_CommandRead( stream_t *p_access, int i_command1,
                            int i_command2 )
{
    access_sys_t *p_sys = p_access->p_sys;
    int i_count;
    int i_status;

    for( i_count = 0; i_count < MMS_RETRY_MAX; )
    {
        i_status = mms_ReceiveCommand( p_access );
        if( i_status < 0 || p_sys->i_command == 0 )
        {
            i_count++;
        }
        else if( i_command1 == 0 && i_command2 == 0)
        {
            return VLC_SUCCESS;
        }
        else if( p_sys->i_command == i_command1 ||
                 p_sys->i_command == i_command2 )
        {
            return VLC_SUCCESS;
        }
        else
        {
            switch( p_sys->i_command )
            {
                case 0x03:
                    msg_Warn( p_access, "socket closed by server" );
                    p_sys->b_eof = true;
                    return VLC_EGENERIC;
                case 0x1e:
                    msg_Warn( p_access, "end of media stream" );
                    p_sys->b_eof = true;
                    return VLC_EGENERIC;
                default:
                    break;
            }
        }
    }
    p_sys->b_eof = true;
    msg_Warn( p_access, "failed to receive command (aborting)" );

    return VLC_EGENERIC;
}


static int mms_HeaderMediaRead( stream_t *p_access, int i_type )
{
    access_sys_t *p_sys = p_access->p_sys;
    int          i_count;

    for( i_count = 0; i_count < MMS_RETRY_MAX; )
    {
        int i_status;

        i_status = mms_ReceivePacket( p_access );
        if( i_status < 0 )
        {
            i_count++;
            msg_Warn( p_access, "cannot receive header (%d/%d)",
                      i_count, MMS_RETRY_MAX );
        }
        else if( i_status == i_type || i_type == MMS_PACKET_ANY )
        {
            return i_type;
        }
        else if( i_status == MMS_PACKET_CMD )
        {
            switch( p_sys->i_command )
            {
                case 0x03:
                    msg_Warn( p_access, "socket closed by server" );
                    p_sys->b_eof = true;
                    return -1;
                case 0x1e:
                    msg_Warn( p_access, "end of media stream" );
                    p_sys->b_eof = true;
                    return -1;
                case 0x20:
                    /* XXX not too dificult to be done EXCEPT that we
                     * need to restart demuxer... and I don't see how we
                     * could do that :p */
                    msg_Err( p_access,
                             "reinitialization needed --> unsupported" );
                    p_sys->b_eof = true;
                    return -1;
                default:
                    break;
            }
        }
    }

    msg_Err( p_access, "cannot receive %s (aborting)",
             ( i_type == MMS_PACKET_HEADER ) ? "header" : "media data" );
    p_sys->b_eof = true;
    return -1;
}

noreturn static void *KeepAliveThread( void *p_data )
{
    stream_t *p_access = p_data;

    for( ;; )
    {
        /* Send keep-alive every ten seconds */
        int canc = vlc_savecancel();

        mms_CommandSend( p_access, 0x1b, 0, 0, NULL, 0 );

        vlc_restorecancel( canc );

        msleep( 10 * CLOCK_FREQ );
    }
    vlc_assert_unreachable();
}

static void KeepAliveStart( stream_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;
    if( p_sys->b_keep_alive )
        return;

    p_sys->b_keep_alive = !vlc_clone( &p_sys->keep_alive,
                                      KeepAliveThread, p_access,
                                      VLC_THREAD_PRIORITY_LOW );
}

static void KeepAliveStop( stream_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;
    if( !p_sys->b_keep_alive )
        return;

    vlc_cancel( p_sys->keep_alive );
    vlc_join( p_sys->keep_alive, NULL );
    p_sys->b_keep_alive = false;
}
