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using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace SoundIOSharp
{
public readonly struct SoundIOChannelLayout
{
public static int BuiltInCount
{
get { return Natives.soundio_channel_layout_builtin_count(); }
}
public static SoundIOChannelLayout GetBuiltIn(int index)
{
return new SoundIOChannelLayout(Natives.soundio_channel_layout_get_builtin(index));
}
public static SoundIOChannelLayout GetDefault(int channelCount)
{
var handle = Natives.soundio_channel_layout_get_default(channelCount);
return new SoundIOChannelLayout (handle);
}
public static SoundIOChannelId ParseChannelId(string name)
{
var ptr = Marshal.StringToHGlobalAnsi(name);
try
{
return (SoundIOChannelId)Natives.soundio_parse_channel_id(ptr, name.Length);
}
finally
{
Marshal.FreeHGlobal(ptr);
}
}
// instance members
internal SoundIOChannelLayout(Pointer<SoundIoChannelLayout> handle)
{
this.handle = handle;
}
readonly Pointer<SoundIoChannelLayout> handle;
public bool IsNull
{
get { return handle.Handle == IntPtr.Zero; }
}
internal IntPtr Handle
{
get { return handle; }
}
public int ChannelCount
{
get { return IsNull ? 0 : Marshal.ReadInt32((IntPtr)handle + channel_count_offset); }
}
static readonly int channel_count_offset = (int)Marshal.OffsetOf<SoundIoChannelLayout>("channel_count");
public string Name
{
get { return IsNull ? null : Marshal.PtrToStringAnsi(Marshal.ReadIntPtr((IntPtr)handle + name_offset)); }
}
static readonly int name_offset = (int)Marshal.OffsetOf<SoundIoChannelLayout>("name");
public IEnumerable<SoundIOChannelId> Channels
{
get
{
if (IsNull) yield break;
for (int i = 0; i < 24; i++)
{
yield return (SoundIOChannelId)Marshal.ReadInt32((IntPtr)handle + channels_offset + sizeof(SoundIoChannelId) * i);
}
}
}
static readonly int channels_offset = (int)Marshal.OffsetOf<SoundIoChannelLayout>("channels");
public override bool Equals(object other)
{
if (!(other is SoundIOChannelLayout)) return false;
var s = (SoundIOChannelLayout) other;
return handle == s.handle || Natives.soundio_channel_layout_equal(handle, s.handle);
}
public override int GetHashCode()
{
return handle.GetHashCode();
}
public string DetectBuiltInName()
{
if (IsNull) throw new InvalidOperationException();
return Natives.soundio_channel_layout_detect_builtin(handle) ? Name : null;
}
public int FindChannel(SoundIOChannelId channel)
{
if (IsNull) throw new InvalidOperationException();
return Natives.soundio_channel_layout_find_channel(handle, (SoundIoChannelId)channel);
}
}
}
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