detectSoundlevel-spike/sourceCode/trunk/Code/CoreAudio/Interfaces/IMMDeviceEnumerator.cs

// -----------------------------------------
// SoundScribe (TM) and related software.
// 
// Copyright (C) 2007-2011 Vannatech
// http://www.vannatech.com
// All rights reserved.
// 
// This source code is subject to the MIT License.
// http://www.opensource.org/licenses/mit-license.php
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// -----------------------------------------

using System;
using System.Runtime.InteropServices;
using Vannatech.CoreAudio.Enumerations;
using Vannatech.CoreAudio.Constants;

namespace Vannatech.CoreAudio.Interfaces
{
    /// <summary>
    /// Provides methods for enumerating audio devices.
    /// </summary>
    /// <remarks>
    /// MSDN Reference: http://msdn.microsoft.com/en-us/library/dd371399.aspx
    /// </remarks>
    public partial interface IMMDeviceEnumerator
    {
        /// <summary>
        /// Generates a collection of audio endpoint devices that meet the specified criteria.
        /// </summary>
		/// <param name="dataFlow">The <see cref="EDataFlow"/> direction for the endpoint devices in the collection.</param>
		/// <param name="stateMask">One or more <see cref="DEVICE_STATE_XXX"/> constants that indicate the state of the endpoints in the collection.</param>
        /// <param name="devices">The <see cref="IMMDeviceCollection"/> interface of the device-collection object.</param>
        /// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
        [PreserveSig]
        int EnumAudioEndpoints(
			[In] [MarshalAs(UnmanagedType.I4)] EDataFlow dataFlow,
            [In] [MarshalAs(UnmanagedType.U4)] UInt32 stateMask,
            [Out] [MarshalAs(UnmanagedType.Interface)] out IMMDeviceCollection devices);

        /// <summary>
        /// Retrieves the default audio endpoint for the specified data-flow direction and role.
        /// </summary>
        /// <param name="dataFlow">The <see cref="EDataFlow"/> direction for the endpoint device.</param>
        /// <param name="role">The <see cref="ERole"/> of the endpoint device.</param>
        /// <param name="device">The <see cref="IMMDevice"/> interface of the default audio endpoint device.</param>
        /// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
        [PreserveSig]
        int GetDefaultAudioEndpoint(
			[In] [MarshalAs(UnmanagedType.I4)] EDataFlow dataFlow,
			[In] [MarshalAs(UnmanagedType.I4)] ERole role,
			[Out] [MarshalAs(UnmanagedType.Interface)] out IMMDevice device);

        /// <summary>
        /// Retrieves an endpoint device that is specified by an endpoint device-identification string.
        /// </summary>
        /// <param name="endpointId">The endpoint ID.</param>
        /// <param name="device">The <see cref="IMMDevice"/> interface for the specified device.</param>
        /// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
        [PreserveSig]
        int GetDevice(
			[In] [MarshalAs(UnmanagedType.LPWStr)] string endpointId,
			[Out] [MarshalAs(UnmanagedType.Interface)] out IMMDevice device);

        /// <summary>
        /// Registers a client's notification callback interface.
        /// </summary>
        /// <param name="client">The <see cref="IMMNotificationClient"/> interface that the client is registering for notification callbacks.</param>
        /// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
        [PreserveSig]
        int RegisterEndpointNotificationCallback(
			[In] [MarshalAs(UnmanagedType.Interface)] IMMNotificationClient client);

        /// <summary>
        /// Deletes the registration of a notification interface that the client registered in a previous call
        /// to the <see cref="IMMDeviceEnumerator.RegisterEndpointNotificationCallback"/> method.
        /// </summary>
        /// <param name="client">A <see cref="IMMNotificationClient"/> interface that was previously registered for notification callbacks.</param>
        /// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
        [PreserveSig]
        int UnregisterEndpointNotificationCallback(
			[In] [MarshalAs(UnmanagedType.Interface)] IMMNotificationClient client);
    }
}