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

namespace Vannatech.CoreAudio.Interfaces
{
    /// <summary>
	/// Enables a client to read input data from a capture endpoint buffer.
    /// </summary>
    /// <remarks>
	/// MSDN Reference: http://msdn.microsoft.com/en-us/library/dd370858.aspx
    /// </remarks>
	public partial interface IAudioCaptureClient
    {
		/// <summary>
		/// Retrieves a pointer to the next available packet of data in the capture endpoint buffer.
		/// </summary>
		/// <param name="dataPointer">Receives the starting address of a byte array containing the next data packet that is available for the client to read.</param>
		/// <param name="frameCount">Receives the number of audio frames available in the data packet</param>
		/// <param name="bufferStatus">Receives the buffer-status flags.</param>
		/// <param name="devicePosition">Receives the device position of the first audio frame in the data packet.</param>
		/// <param name="counterPosition">
		/// Receives the value of the performance counter at the time that the audio endpoint
		/// device recorded the device position of the first audio frame in the data packet.
		/// </param>
		/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
		[PreserveSig]
		int GetBuffer(
			[Out] [MarshalAs(UnmanagedType.SysInt)] out IntPtr dataPointer,
			[Out] [MarshalAs(UnmanagedType.U4)] out UInt32 frameCount,
			[Out] [MarshalAs(UnmanagedType.U4)] out AUDCLNT_BUFFERFLAGS bufferStatus,
			[Out, Optional] [MarshalAs(UnmanagedType.U8)] out UInt64 devicePosition,
			[Out, Optional] [MarshalAs(UnmanagedType.U8)] out UInt64 counterPosition);

		/// <summary>
		/// Releases a buffer.
		/// </summary>
		/// <param name="numFramesRead">The number of audio frames that the client read from the capture buffer.</param>
		/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
		[PreserveSig]
		int ReleaseBuffer(
			[In] [MarshalAs(UnmanagedType.U4)] UInt32 numFramesRead);

		/// <summary>
		/// Retrieves the number of frames in the next data packet in the capture endpoint buffer.
		/// </summary>
		/// <param name="frameCount">Receives the number of audio frames in the next capture packet.</param>
		/// <returns>An HRESULT code indicating whether the operation passed of failed.</returns>
		[PreserveSig]
		int GetNextPacketSize(
			[Out] [MarshalAs(UnmanagedType.U4)] out UInt32 frameCount);
    }
}