/
WavPlayer.cs
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/
WavPlayer.cs
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/*
* 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
{
/// <summary>
/// Provides the ability to play a wav file.
/// </summary>
/// <since_tizen> 3 </since_tizen>
public static class WavPlayer
{
/// <summary>
/// Plays a wav file based on the specified <see cref="AudioStreamPolicy"/>.
/// </summary>
/// <returns>A task that represents the asynchronous operation.</returns>
/// <param name="path">A file path to play.</param>
/// <param name="streamPolicy">A <see cref="AudioStreamPolicy"/>.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="path"/> is null.
/// <para>-or-</para>
/// <paramref name="streamPolicy"/> is null.
/// </exception>
/// <exception cref="InvalidOperationException">An internal error occurs.</exception>
/// <exception cref="FileNotFoundException"><paramref name="path"/> does not exists.</exception>
/// <exception cref="FileFormatException">The format of <paramref name="path"/> is not supported.</exception>
/// <exception cref="ObjectDisposedException"><paramref name="streamPolicy"/> has already been disposed of.</exception>
/// <since_tizen> 3 </since_tizen>
public static Task StartAsync(string path, AudioStreamPolicy streamPolicy)
{
return StartAsync(path, streamPolicy, CancellationToken.None);
}
/// <summary>
/// Plays a wav file based on the specified <see cref="AudioStreamPolicy"/>.
/// </summary>
/// <returns>A task that represents the asynchronous operation.</returns>
/// <param name="path">A file path to play.</param>
/// <param name="streamPolicy">A <see cref="AudioStreamPolicy"/>.</param>
/// <param name="cancellationToken">A cancellation token which can be used to stop.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="path"/> is null.
/// <para>-or-</para>
/// <paramref name="streamPolicy"/> is null.
/// </exception>
/// <exception cref="InvalidOperationException">An internal error occurs.</exception>
/// <exception cref="FileNotFoundException"><paramref name="path"/> does not exists.</exception>
/// <exception cref="FileFormatException">The format of <paramref name="path"/> is not supported.</exception>
/// <exception cref="ObjectDisposedException"><paramref name="streamPolicy"/> has already been disposed of.</exception>
/// <since_tizen> 3 </since_tizen>
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<bool>();
Native.WavPlayerCompletedCallback cb = (id_, _) => tcs.TrySetResult(true);
using (var cbKeeper = 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.ConfigureAwait(false);
}
}
}
private static IDisposable RegisterCancellationAction(TaskCompletionSource<bool> tcs,
CancellationToken cancellationToken, int id)
{
if (cancellationToken.CanBeCanceled == false)
{
return null;
}
return cancellationToken.Register(() =>
{
Native.Stop(id).Validate("Failed to cancel");
tcs.TrySetCanceled();
});
}
}
}