/// <summary>
/// Gets the language code for the specified index, or null if the language is undefined.
/// </summary>
/// <returns>The number of tracks.</returns>
/// <remarks>
/// <para>The <see cref="Player"/> that owns this instance must be in the <see cref="PlayerState.Ready"/>,
/// <see cref="PlayerState.Playing"/>, or <see cref="PlayerState.Paused"/> state.</para>
/// <para>The language codes are defined in ISO 639-1.</para>
/// </remarks>
/// <exception cref="ObjectDisposedException">The <see cref="Player"/> that this instance belongs to has been disposed of.</exception>
/// <exception cref="InvalidOperationException">The <see cref="Player"/> that this instance belongs to is not in the valid state.</exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="index"/> is less than zero.<br/>
/// -or-<br/>
/// <paramref name="index"/> is equal to or greater than <see cref="GetCount()"/>.
/// </exception>
/// <since_tizen> 3 </since_tizen>
public string GetLanguageCode(int index)
{
_owner.ValidatePlayerState(PlayerState.Ready, PlayerState.Playing, PlayerState.Paused);
if (index < 0 || GetCount() <= index)
{
throw new ArgumentOutOfRangeException(nameof(index), index,
$"Valid index range is 0 <= x < {nameof(GetCount)}(), but got { index }.");
}
IntPtr code = IntPtr.Zero;
try
{
NativePlayer.GetTrackLanguageCode(_owner.Handle, _streamType, index, out code).
ThrowIfFailed(_owner, "Failed to get the selected language of the player");
string result = Marshal.PtrToStringAnsi(code);
if (result == "und")
{
Log.Error(PlayerLog.Tag, "not defined code");
return(null);
}
Log.Info(PlayerLog.Tag, "get language code : " + result);
return(result);
}
finally
{
LibcSupport.Free(code);
}
}