Mp3读取，Effect Remove

Signed-off-by: TRAfoer <lhf190@outlook.com>

Assets/NLayer/IMpegFrame.cs

@@ -0,0 +1,85 @@
+namespace NLayer
+{
+    /// <summary>
+    /// Defines a standard way of representing a MPEG frame to the decoder
+    /// </summary>
+    public interface IMpegFrame
+    {
+        /// <summary>
+        /// Sample rate of this frame
+        /// </summary>
+        int SampleRate { get; }
+
+        /// <summary>
+        /// The samplerate index (directly from the header)
+        /// </summary>
+        int SampleRateIndex { get; }
+
+        /// <summary>
+        /// Frame length in bytes
+        /// </summary>
+        int FrameLength { get; }
+
+        /// <summary>
+        /// Bit Rate
+        /// </summary>
+        int BitRate { get; }
+
+        /// <summary>
+        /// MPEG Version
+        /// </summary>
+        MpegVersion Version { get; }
+
+        /// <summary>
+        /// MPEG Layer
+        /// </summary>
+        MpegLayer Layer { get; }
+
+        /// <summary>
+        /// Channel Mode
+        /// </summary>
+        MpegChannelMode ChannelMode { get; }
+
+        /// <summary>
+        /// The number of samples in this frame
+        /// </summary>
+        int ChannelModeExtension { get; }
+
+        /// <summary>
+        /// The channel extension bits
+        /// </summary>
+        int SampleCount { get; }
+
+        /// <summary>
+        /// The bitrate index (directly from the header)
+        /// </summary>
+        int BitRateIndex { get; }
+
+        /// <summary>
+        /// Whether the Copyright bit is set
+        /// </summary>
+        bool IsCopyrighted { get; }
+
+        /// <summary>
+        /// Whether a CRC is present
+        /// </summary>
+        bool HasCrc { get; }
+
+        /// <summary>
+        /// Whether the CRC check failed (use error concealment strategy)
+        /// </summary>
+        bool IsCorrupted { get; }
+
+        /// <summary>
+        /// Resets the bit reader so frames can be reused
+        /// </summary>
+        void Reset();
+
+        /// <summary>
+        /// Provides sequential access to the bitstream in the frame (after the header and optional CRC)
+        /// </summary>
+        /// <param name="bitCount">The number of bits to read</param>
+        /// <returns>-1 if the end of the frame has been encountered, otherwise the bits requested</returns>
+        int ReadBits(int bitCount);
+    }
+}