using System;
using System.Runtime.InteropServices;

namespace VideoReader;

public class libfaad
{
	public struct NeAACDecConfiguration
	{
		public char defObjectType;

		public int defSampleRate;

		public char outputFormat;

		public char downMatrix;

		public char useOldADTSFormat;
	}

	public struct NeAACDecFrameInfo
	{
		public int bytesconsumed;

		public int samples;

		public char channels;

		public char error;

		public int samplerate;

		public char sbr;

		public char object_type;

		public char header_type;

		public char num_front_channels;

		public char num_side_channels;

		public char num_back_channels;

		public char num_lfe_channels;

		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
		public char[] channel_position;

		public char ps;
	}

	private const string libPath = "libfaad2.dll";

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public static extern IntPtr NeAACDecOpen();

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public static extern IntPtr NeAACDecGetCurrentConfiguration(IntPtr hpDecoder);

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public static extern char NeAACDecSetConfiguration(IntPtr hpDecoder, IntPtr config);

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public unsafe static extern int NeAACDecInit(IntPtr hpDecoder, byte[] buffer, int buffer_size, ulong* samplerate, char* channels);

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public unsafe static extern char NeAACDecInit2(IntPtr hpDecoder, byte[] buffer, int SizeOfDecoderSpecificInfo, ulong* samplerate, char* channels);

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public static extern IntPtr NeAACDecDecode(IntPtr hpDecoder, out NeAACDecFrameInfo hInfo, byte[] buffer, int buffer_size);

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public static extern void NeAACDecClose(IntPtr hpDecoder);

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public unsafe static extern char* NeAACDecGetErrorMessage(char errcode);

	[DllImport("libfaad2.dll", CallingConvention = CallingConvention.Cdecl)]
	public static extern char NeAACDecAudioSpecificConfig(IntPtr pBuffer, int buffer_size, IntPtr mp4ASC);
}