detectSoundlevel-spike/sourceCode/trunk/Code/CoreAudio/Interfaces/IAudioMeterInformation.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;

namespace Vannatech.CoreAudio.Interfaces
{
    /// <summary>
    /// Represents a peak meter on the audio stream to or from an audio endpoint device.
    /// </summary>
    /// <remarks>
    /// MSDN Reference: http://msdn.microsoft.com/en-us/library/dd368227.aspx
    /// </remarks>
    public partial interface IAudioMeterInformation
    {
		/// <summary>
		/// Gets the peak sample value for the channels in the audio stream.
		/// </summary>
		/// <param name="peak">The peak sample value for the audio stream.</param>
		/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
		[PreserveSig]
		int GetPeakValue(
			[Out] [MarshalAs(UnmanagedType.R4)] out float peak);

		/// <summary>
		/// Gets the number of channels in the audio stream that are monitored by peak meters.
		/// </summary>
		/// <param name="channelCount">The channel count.</param>
		/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
		[PreserveSig]
		int GetMeteringChannelCount(
			[Out] [MarshalAs(UnmanagedType.U4)] out UInt32 channelCount);

        /// <summary>
        /// Gets the peak sample values for all the channels in the audio stream.
        /// </summary>
        /// <param name="channelCount">The channel count.</param>
        /// <param name="peakValues">An array of peak sample values.</param>
        /// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
        [PreserveSig]
        int GetChannelsPeakValues(
            [In] [MarshalAs(UnmanagedType.U4)] UInt32 channelCount,
            [In, Out] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.R4)] float[] peakValues);

        /// <summary>
        /// Queries the audio endpoint device for its hardware-supported functions.
        /// </summary>
        /// <param name="hardwareSupportMask">A hardware support mask that indicates the capabilities of the endpoint.</param>
        /// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
        [PreserveSig]
        int QueryHardwareSupport(
			[Out] [MarshalAs(UnmanagedType.U4)] out UInt32 hardwareSupportMask);
    }
}