[C#/COMMON/NAUDIO/.NET5] MediaFoundationApi 클래스 : EnumerateTransforms 정적 메소드를 사용해 미디어 파운데이션 변환 열거하기

■ MediaFoundationApi 클래스의 EnumerateTransforms 정적 메소드를 사용해 미디어 파운데이션 변환을 열거하는 방법을 보여준다.

▶ Program.cs


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
    }
}

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

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

}

TestProject.zip