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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
namespace SoundIOSharp
{
public 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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