/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Native = Interop.WavPlayer;
namespace Tizen.Multimedia
{
///
/// Provides the ability to play a wav file.
///
public static class WavPlayer
{
///
/// Plays a wav file based on the specified .
///
/// A task that represents the asynchronous operation.
/// A file path to play.
/// A .
///
/// is null.
/// -or-
/// is null.
///
/// An internal error occurs.
/// does not exists.
/// The format of is not supported.
/// has already been disposed of.
public static Task StartAsync(string path, AudioStreamPolicy streamPolicy)
{
return StartAsync(path, streamPolicy, CancellationToken.None);
}
///
/// Plays a wav file based on the specified .
///
/// A task that represents the asynchronous operation.
/// A file path to play.
/// A .
/// A cancellation token which can be used to stop.
///
/// is null.
/// -or-
/// is null.
///
/// An internal error occurs.
/// does not exists.
/// The format of is not supported.
/// has already been disposed of.
public static Task StartAsync(string path, AudioStreamPolicy streamPolicy,
CancellationToken cancellationToken)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
if (streamPolicy == null)
{
throw new ArgumentNullException(nameof(streamPolicy));
}
if (File.Exists(path) == false)
{
throw new FileNotFoundException("File does not exists.", path);
}
return cancellationToken.IsCancellationRequested ? Task.FromCanceled(cancellationToken) :
StartAsyncCore(path, streamPolicy, cancellationToken);
}
private static async Task StartAsyncCore(string path, AudioStreamPolicy streamPolicy,
CancellationToken cancellationToken)
{
var tcs = new TaskCompletionSource();
Native.WavPlayerCompletedCallback cb = (id_, _) => tcs.TrySetResult(true);
using (ObjectKeeper.Get(cb))
{
Native.Start(path, streamPolicy.Handle, cb, IntPtr.Zero, out var id).
Validate("Failed to play.");
using (RegisterCancellationAction(tcs, cancellationToken, id))
{
await tcs.Task;
}
}
}
private static IDisposable RegisterCancellationAction(TaskCompletionSource tcs,
CancellationToken cancellationToken, int id)
{
if (cancellationToken.CanBeCanceled == false)
{
return null;
}
return cancellationToken.Register(() =>
{
Native.Stop(id).Validate("Failed to cancel");
tcs.TrySetCanceled();
});
}
}
}