/// <summary>
/// Performs a seek operation to the specified position.
/// </summary>
/// <param name="position">The position.</param>
private void Seek(TimeSpan position)
{
SeekingDone.Wait();
var startTime = DateTime.UtcNow;
var resumeClock = Clock.IsRunning;
Clock.Pause();
SeekingDone.Reset();
PacketReadingCycle.Wait();
FrameDecodingCycle.Wait();
BlockRenderingCycle.Wait();
// Clear Blocks and frames, reset the render times
foreach (var t in Container.Components.MediaTypes)
{
Frames[t].Clear();
Blocks[t].Clear();
LastRenderTime[t] = TimeSpan.MinValue;
}
// Populate frame with after-seek operation
var frames = Container.Seek(position);
foreach (var frame in frames)
{
Frames[frame.MediaType].Push(frame);
}
// Resume the clock if it was running before the seek operation
OnPropertyChanged(nameof(Position));
if (resumeClock)
{
Clock.Play();
}
Container.Log(MediaLogMessageType.Debug,
$"SEEK D: Elapsed: {startTime.DebugElapsedUtc()}");
RequestedSeekPosition = null;
SeekingDone.Set();
}
/// <summary>
/// Logs a block rendering operation as a Trace Message
/// if the debugger is attached.
/// </summary>
/// <param name="container">The container.</param>
/// <param name="block">The block.</param>
/// <param name="clockPosition">The clock position.</param>
/// <param name="renderIndex">Index of the render.</param>
internal static void LogRenderBlock(this MediaContainer container, MediaBlock block, TimeSpan clockPosition, int renderIndex)
{
if (Debugger.IsAttached == false)
{
return;
}
try
{
var drift = TimeSpan.FromTicks(clockPosition.Ticks - block.StartTime.Ticks);
container?.Log(MediaLogMessageType.Trace,
($"{block.MediaType.ToString().Substring(0, 1)} "
+ $"BLK: {block.StartTime.Debug()} | "
+ $"CLK: {clockPosition.Debug()} | "
+ $"DFT: {drift.TotalMilliseconds,4:0} | "
+ $"IX: {renderIndex,3} | "
+ $"PQ: {container?.Components[block.MediaType]?.PacketBufferLength / 1024d,7:0.0}k | "
+ $"TQ: {container?.Components.PacketBufferLength / 1024d,7:0.0}k"));
}
catch
{
// swallow
}
}
public async Task CloseAsync()
{
Container?.Log(MediaLogMessageType.Debug, $"{nameof(CloseAsync)}: Entered");
Clock.Pause();
IsTaskCancellationPending = true;
// Wait for cycles to complete.
await Task.Run(() =>
{
while (!BlockRenderingCycle.Wait(1))
{
}
while (!FrameDecodingCycle.Wait(1))
{
}
while (!PacketReadingCycle.Wait(1))
{
}
});
BlockRenderingTask?.Join();
FrameDecodingTask?.Join();
PacketReadingTask?.Join();
BlockRenderingTask = null;
FrameDecodingTask = null;
PacketReadingTask = null;
foreach (var renderer in Renderers.Values)
{
renderer.Close();
}
Renderers.Clear();
// Reset the clock
Clock.Reset();
Container?.Log(MediaLogMessageType.Debug, $"{nameof(CloseAsync)}: Completed");
// Dispose the container
if (Container != null)
{
Container.Dispose();
Container = null;
}
// Dispose the Blocks for all components
foreach (var kvp in Blocks)
{
kvp.Value.Dispose();
}
Blocks.Clear();
// Dispose the Frames for all components
foreach (var kvp in Frames)
{
kvp.Value.Dispose();
}
Frames.Clear();
// Clear the render times
LastRenderTime.Clear();
// Update notification properties
UpdateMediaProperties();
MediaState = MediaState.Close;
}
/// <summary>
/// Opens the specified media Asynchronously
/// </summary>
/// <param name="uri">The URI.</param>
/// <returns></returns>
private async Task OpenAsync(Uri uri)
{
try
{
await Task.Run(() =>
{
var mediaUrl = uri.IsFile ? uri.LocalPath : uri.ToString();
Container = new MediaContainer(mediaUrl);
RaiseMediaOpeningEvent();
Container.Log(MediaLogMessageType.Debug, $"{nameof(OpenAsync)}: Entered");
Container.Initialize();
});
foreach (var t in Container.Components.MediaTypes)
{
Blocks[t] = new MediaBlockBuffer(MaxBlocks[t], t);
Frames[t] = new MediaFrameQueue();
LastRenderTime[t] = TimeSpan.MinValue;
Renderers[t] = CreateRenderer(t);
}
IsTaskCancellationPending = false;
BlockRenderingCycle.Set();
FrameDecodingCycle.Set();
PacketReadingCycle.Set();
PacketReadingTask = new Thread(RunPacketReadingWorker)
{
IsBackground = true
};
FrameDecodingTask = new Thread(RunFrameDecodingWorker)
{
IsBackground = true
};
BlockRenderingTask = new Thread(RunBlockRenderingWorker)
{
IsBackground = true
};
PacketReadingTask.Start();
FrameDecodingTask.Start();
BlockRenderingTask.Start();
RaiseMediaOpenedEvent();
if (LoadedBehavior == MediaState.Play)
{
Play();
}
}
catch (Exception ex)
{
RaiseMediaFailedEvent(ex);
}
finally
{
UpdateMediaProperties();
Container.Log(MediaLogMessageType.Debug, $"{nameof(OpenAsync)}: Completed");
}
}
