mmstu.c

uclinux 下的vlc播放器源代码

            {
                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 kb/s)",
                          i,
                          ( p_sys->asfh.stream[i].i_cat == ASF_STREAM_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 kb/s)",
                          i,
                          ( p_sys->asfh.stream[i].i_cat == ASF_STREAM_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( access_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 */
        mms_HeaderMediaRead( p_access, MMS_PACKET_MEDIA );
        msg_Dbg( p_access, "streaming started" );
        return( 0 );
    }
}

/****************************************************************************
 * MMSStop : Stop streaming
 ****************************************************************************/
static int MMSStop( access_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( access_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 );
    }

    FREE( p_sys->p_cmd );
    FREE( p_sys->p_media );
    FREE( p_sys->p_header );

    FREE( p_sys->psz_server_version );
    FREE( p_sys->psz_tool_version );
    FREE( p_sys->psz_update_player_url );
    FREE( p_sys->psz_encryption_type );
}

/****************************************************************************
 *
 * MMS specific functions
 *
 ****************************************************************************/
static int mms_CommandSend( access_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 */
    i_ret = net_Write( p_access, p_sys->i_handle_tcp, NULL, buffer.p_data,
                       buffer.i_data - ( 8 - ( i_data - i_data_old ) ) );
    if( i_ret != buffer.i_data - ( 8 - ( i_data - i_data_old ) ) )
    {
        msg_Err( p_access, "failed to send command" );
        return VLC_EGENERIC;
    }

    var_buffer_free( &buffer );
    return VLC_SUCCESS;
}

static int NetFillBuffer( access_t *p_access )
{
#ifdef UNDER_CE
    return -1;

#else
    access_sys_t    *p_sys = p_access->p_sys;
    struct timeval  timeout;
    fd_set          fds_r, fds_e;
    int             i_ret;

    /* FIXME when using udp */
    ssize_t i_tcp, i_udp;
    ssize_t i_tcp_read, i_udp_read;
    int i_handle_max;
    int i_try = 0;

    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 */
    }

    i_handle_max = 0;

    if( i_tcp > 0 )
        i_handle_max = __MAX( i_handle_max, p_sys->i_handle_tcp );
    if( i_udp > 0 )
        i_handle_max = __MAX( i_handle_max, p_sys->i_handle_udp );

    if( i_handle_max == 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 ); */
    }

    /* Find if some data is available */
    do
    {
        i_try++;

        /* Initialize file descriptor set */
        FD_ZERO( &fds_r );
        FD_ZERO( &fds_e );

        if( i_tcp > 0 )
        {
            FD_SET( p_sys->i_handle_tcp, &fds_r );
            FD_SET( p_sys->i_handle_tcp, &fds_e );
        }
        if( i_udp > 0 )
        {
            FD_SET( p_sys->i_handle_udp, &fds_r );
            FD_SET( p_sys->i_handle_udp, &fds_e );
        }

        /* We'll wait 0.5 second if nothing happens */
        timeout.tv_sec = 0;
        timeout.tv_usec = 500000;

        if( i_try > 3 && (p_sys->i_buffer_tcp > 0 || p_sys->i_buffer_udp > 0) )
        {
            return -1;
        }

        if( p_access->b_die || p_access->b_error ) return -1;

        //msg_Dbg( p_access, "NetFillBuffer: trying again (select)" );

    } while( !(i_ret = select(i_handle_max +1, &fds_r, 0, &fds_e, &timeout)) ||
             (i_ret < 0 && errno == EINTR) );

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

    i_tcp_read = i_udp_read = 0;

    if( i_tcp > 0 && FD_ISSET( p_sys->i_handle_tcp, &fds_r ) )
    {
        i_tcp_read =
            recv( p_sys->i_handle_tcp,
                  p_sys->buffer_tcp + p_sys->i_buffer_tcp,
                  i_tcp + MMS_BUFFER_SIZE/2, 0 );
    }

    if( i_udp > 0 && FD_ISSET( p_sys->i_handle_udp, &fds_r ) )
    {
        i_udp_read = recv( p_sys->i_handle_udp,
                           p_sys->buffer_udp + p_sys->i_buffer_udp,
                           i_udp + MMS_BUFFER_SIZE/2, 0 );
    }

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

    return i_tcp_read + i_udp_read;
#endif
}

static int  mms_ParseCommand( access_t *p_access,
                              uint8_t *p_data,
                              int i_data,
                              int *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;
    int         i_length;
    uint32_t    i_id;

    if( p_sys->p_cmd )
    {
        free( p_sys->p_cmd );
    }
    p_sys->i_cmd = i_data;
    p_sys->p_cmd = malloc( i_data );
    memcpy( p_sys->p_cmd, p_data, i_data );

    *pi_used = i_data; /* by default */

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

    if( i_id != 0xb00bface )
    {
        msg_Err( p_access,
                 "incorrect command header (0x%x)", i_id );
        p_sys->i_command = 0;
        return -1;
    }

    if( i_length > p_sys->i_cmd )
    {
        msg_Warn( p_access,
                  "truncated command (missing %d bytes)",
                   i_length - i_data  );
        p_sys->i_command = 0;
        return -1;
    }
    else if( i_length < p_sys->i_cmd )
    {