static int rtp_packetize_xiph( sout_stream_id_sys_t *id, block_t *in )
{
    int     i_max   = rtp_mtu (id) - 6; /* payload max in one packet */
    int     i_count = ( in->i_buffer + i_max - 1 ) / i_max;

    uint8_t *p_data = in->p_buffer;
    int     i_data  = in->i_buffer;

    for( int i = 0; i < i_count; i++ )
    {
        int           i_payload = __MIN( i_max, i_data );
        block_t *out = block_Alloc( 18 + i_payload );

        unsigned fragtype, numpkts;
        if (i_count == 1)
        {
            /* No fragmentation */
            fragtype = 0;
            numpkts = 1;
        }
        else
        {
            /* Fragmentation */
            numpkts = 0;
            if (i == 0)
                fragtype = 1;
            else if (i == i_count - 1)
                fragtype = 3;
            else
                fragtype = 2;
        }
        /* Ident:24, Fragment type:2, Vorbis/Theora Data Type:2, # of pkts:4 */
        uint32_t header = ((XIPH_IDENT & 0xffffff) << 8) |
                          (fragtype << 6) | (0 << 4) | numpkts;

        /* rtp common header */
        rtp_packetize_common( id, out, 0, in->i_pts);

        SetDWBE( out->p_buffer + 12, header);
        SetWBE( out->p_buffer + 16, i_payload);
        memcpy( &out->p_buffer[18], p_data, i_payload );

        out->i_dts    = in->i_dts + i * in->i_length / i_count;
        out->i_length = in->i_length / i_count;

        rtp_packetize_send( id, out );

        p_data += i_payload;
        i_data -= i_payload;
    }

    block_Release(in);
    return VLC_SUCCESS;
}
Unknown