using System;
using System.Runtime.InteropServices;

namespace SoundIOSharp
{
	public struct SoundIOChannelAreas
	{
		static readonly int native_size = Marshal.SizeOf<SoundIoChannelArea> ();

		internal SoundIOChannelAreas (IntPtr head, int channelCount, int frameCount)
		{
			this.head = head;
			this.channel_count = channelCount;
			this.frame_count = frameCount;
		}

		IntPtr head;
		int channel_count;
		int frame_count;

		public bool IsEmpty {
			get { return head == IntPtr.Zero; }
		}

		public SoundIOChannelArea GetArea (int channel)
		{
			return new SoundIOChannelArea (head + native_size * channel);
		}

		public int ChannelCount => channel_count;
		public int FrameCount => frame_count;
	}
}
