■ MediaFoundationApi 클래스의 EnumerateTransforms 정적 메소드를 사용해 미디어 파운데이션 변환을 열거하는 방법을 보여준다.
▶ Program.cs
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using System; using System.Collections.Generic; using System.Runtime.InteropServices; using System.Text; using NAudio.CoreAudioApi.Interfaces; using NAudio.MediaFoundation; using NAudio.Utils; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 어트리뷰트 추가하기 - AddAttribute(stringBuilder, mfActivate, index) /// <summary> /// 어트리뷰트 추가하기 /// </summary> /// <param name="stringBuilder">문자열 빌더</param> /// <param name="mfActivate">MF 활성자</param> /// <param name="index">인덱스</param> private static void AddAttribute(StringBuilder stringBuilder, IMFActivate mfActivate, int index) { IntPtr propertyVariantHandle = Marshal.AllocHGlobal(Marshal.SizeOf<PropVariant>()); try { mfActivate.GetItemByIndex(index, out var key, propertyVariantHandle); PropVariant propertyVariant = (PropVariant)Marshal.PtrToStructure(propertyVariantHandle, typeof(PropVariant)); string propertyName = FieldDescriptionHelper.Describe(typeof (MediaFoundationAttributes), key); if(key == MediaFoundationAttributes.MFT_INPUT_TYPES_Attributes || key == MediaFoundationAttributes.MFT_OUTPUT_TYPES_Attributes) { MFT_REGISTER_TYPE_INFO[] typeInformationArray = propertyVariant.GetBlobAsArrayOf<MFT_REGISTER_TYPE_INFO>(); stringBuilder.AppendFormat("{0} : {1} 항목", propertyName, typeInformationArray.Length); stringBuilder.AppendLine(); foreach(MFT_REGISTER_TYPE_INFO typeInformation in typeInformationArray) { stringBuilder.AppendFormat ( " {0}-{1}", FieldDescriptionHelper.Describe(typeof (MediaTypes ), typeInformation.guidMajorType), FieldDescriptionHelper.Describe(typeof (AudioSubtypes), typeInformation.guidSubtype ) ); stringBuilder.AppendLine(); } } else if(key == MediaFoundationAttributes.MF_TRANSFORM_CATEGORY_Attribute) { stringBuilder.AppendFormat ( "{0} : {1}", propertyName, FieldDescriptionHelper.Describe(typeof (MediaFoundationTransformCategories), (Guid) propertyVariant.Value) ); stringBuilder.AppendLine(); } else if(propertyVariant.DataType == (VarEnum.VT_VECTOR | VarEnum.VT_UI1)) { byte[] valueArray = (byte[]) propertyVariant.Value; stringBuilder.AppendFormat("{0} : BLOB {1} 바이트", propertyName, valueArray.Length); stringBuilder.AppendLine(); } else { stringBuilder.AppendFormat("{0} : {1}", propertyName, propertyVariant.Value); stringBuilder.AppendLine(); } } finally { PropVariant.Clear(propertyVariantHandle); Marshal.FreeHGlobal(propertyVariantHandle); } } #endregion #region 설명하기 - Describe(mfActivate) /// <summary> /// 설명하기 /// </summary> /// <param name="mfActivate">MF 활성자</param> /// <returns>설명</returns> private static string Describe(IMFActivate mfActivate) { mfActivate.GetCount(out var attributeCount); StringBuilder stringBuilder = new StringBuilder(); for(int i = 0; i < attributeCount; i++) { AddAttribute(stringBuilder, mfActivate, i); } return stringBuilder.ToString(); } #endregion #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { Console.WriteLine("--------------------------------------------------"); Console.WriteLine("오디오 이펙트"); Console.WriteLine("--------------------------------------------------"); IEnumerable<IMFActivate> audioEffectEnumerable = MediaFoundationApi.EnumerateTransforms ( MediaFoundationTransformCategories.AudioEffect ); foreach(IMFActivate mfActivate in audioEffectEnumerable) { Console.WriteLine(Describe(mfActivate)); Console.WriteLine(); } Console.WriteLine("--------------------------------------------------"); Console.WriteLine("오디오 디코더"); Console.WriteLine("--------------------------------------------------"); IEnumerable<IMFActivate> audioDecoderEnumerable = MediaFoundationApi.EnumerateTransforms ( MediaFoundationTransformCategories.AudioDecoder ); foreach(IMFActivate mfActivate in audioDecoderEnumerable) { Console.WriteLine(Describe(mfActivate)); Console.WriteLine(); } Console.WriteLine("--------------------------------------------------"); Console.WriteLine("오디오 인코더"); Console.WriteLine("--------------------------------------------------"); IEnumerable<IMFActivate> audioEncoderEnumerable = MediaFoundationApi.EnumerateTransforms ( MediaFoundationTransformCategories.AudioEncoder ); foreach(IMFActivate mfActivate in audioEncoderEnumerable) { Console.WriteLine(Describe(mfActivate)); Console.WriteLine(); } } #endregion } } |
