/// <summary>
/// Continuously converts frmes and places them on the corresponding
/// block buffer. This task is responsible for keeping track of the clock
/// and calling the render methods appropriate for the current clock position.
/// </summary>
internal void RunBlockRenderingWorker()
{
try
{
#region 0. Initialize Running State
// Holds the main media type
var main = Container.Components.Main.MediaType;
// Holds the auxiliary media types
var auxs = Container.Components.MediaTypes.Where(t => t != main).ToArray();
// Holds all components
var all = Container.Components.MediaTypes.ToArray();
// Holds a snapshot of the current block to render
var currentBlock = new MediaTypeDictionary <MediaBlock>();
// Keeps track of how many blocks were rendered in the cycle.
var renderedBlockCount = 0;
// reset render times for all components
foreach (var t in all)
{
LastRenderTime[t] = TimeSpan.MinValue;
}
// Ensure the other workers are running
PacketReadingCycle?.WaitOne();
FrameDecodingCycle?.WaitOne();
// Set the initial clock position
Clock.Position = Blocks[main].RangeStartTime;
var wallClock = Clock.Position;
// Wait for renderers to be ready
foreach (var t in all)
{
Renderers[t]?.WaitForReadyState();
}
#endregion
while (IsTaskCancellationPending == false)
{
#region 1. Control and Capture
// Reset the rendered count to 0
renderedBlockCount = 0;
// Capture current clock position for the rest of this cycle
BlockRenderingCycle?.Reset();
// capture the wall clock for this cycle
wallClock = Clock.Position;
#endregion
#region 2. Handle Block Rendering
// Capture the blocks to render
foreach (var t in all)
{
currentBlock[t] = HasDecoderSeeked ? null : Blocks[t][wallClock];
}
// Render each of the Media Types if it is time to do so.
foreach (var t in all)
{
// Skip rendering for nulls
if (currentBlock[t] == null)
{
continue;
}
// Render by forced signal (TimeSpan.MinValue)
if (LastRenderTime[t] == TimeSpan.MinValue)
{
renderedBlockCount += SendBlockToRenderer(currentBlock[t], wallClock);
continue;
}
// Render because we simply have not rendered
if (currentBlock[t].StartTime != LastRenderTime[t])
{
renderedBlockCount += SendBlockToRenderer(currentBlock[t], wallClock);
continue;
}
}
#endregion
#region 6. Finalize the Rendering Cycle
// Signal the rendering cycle was set.
BlockRenderingCycle?.Set();
// Call the update method on all renderers so they receive what the new wall clock is.
foreach (var t in all)
{
Renderers[t]?.Update(wallClock);
}
// Delay the thread for a bit if we have no more stuff to process
if (IsSeeking == false && renderedBlockCount <= 0 && Commands.PendingCount <= 0)
{
Task.Delay(1).GetAwaiter().GetResult();
}
#endregion
}
}
catch (ThreadAbortException)
{
}
finally
{
// Always exit notifying the cycle is done.
BlockRenderingCycle?.Set();
}
}
/// <summary>
/// Starts the block rendering worker.
/// </summary>
private void StartBlockRenderingWorker()
{
if (HasBlockRenderingWorkerExited != null)
{
return;
}
HasBlockRenderingWorkerExited = new ManualResetEvent(false);
// Synchronized access to parts of the run cycle
var isRunningRenderingCycle = false;
// Holds the main media type
var main = Container.Components.Main.MediaType;
// Holds the auxiliary media types
var auxs = Container.Components.MediaTypes.ExcludeMediaType(main);
// Holds all components
var all = Container.Components.MediaTypes.DeepCopy();
// Holds a snapshot of the current block to render
var currentBlock = new MediaTypeDictionary <MediaBlock>();
// Keeps track of how many blocks were rendered in the cycle.
var renderedBlockCount = new MediaTypeDictionary <int>();
// reset render times for all components
foreach (var t in all)
{
LastRenderTime[t] = TimeSpan.MinValue;
}
// Ensure packet reading is running
PacketReadingCycle.WaitOne();
// wait for main component blocks or EOF or cancellation pending
while (CanReadMoreFramesOf(main) && Blocks[main].Count <= 0)
{
FrameDecodingCycle.WaitOne();
}
// Set the initial clock position
// TODO: maybe update media start time offset to this Minimum, initial Start Time intead of relying on contained meta?
Clock.Update(Blocks[main].RangeStartTime); // .GetMinStartTime()
var wallClock = WallClock;
// Wait for renderers to be ready
foreach (var t in all)
{
Renderers[t]?.WaitForReadyState();
}
// The Render timer is responsible for sending frames to renders
BlockRenderingWorker = new Timer((s) =>
{
#region Detect a Timer Stop
if (IsTaskCancellationPending || HasBlockRenderingWorkerExited.IsSet() || IsDisposed)
{
HasBlockRenderingWorkerExited.Set();
return;
}
#endregion
#region Run the Rendering Cycle
// Updatete Status Properties
State.UpdateBufferingProperties();
// Don't run the cycle if it's already running
if (isRunningRenderingCycle)
{
// TODO: Maybe Log a frame skip here?
return;
}
try
{
#region 1. Control and Capture
// Flag the current rendering cycle
isRunningRenderingCycle = true;
// Reset the rendered count to 0
foreach (var t in all)
{
renderedBlockCount[t] = 0;
}
// Capture current clock position for the rest of this cycle
BlockRenderingCycle.Reset();
#endregion
#region 2. Handle Block Rendering
// Wait for the seek op to finish before we capture blocks
if (HasDecoderSeeked)
{
SeekingDone.WaitOne();
}
// capture the wall clock for this cycle
wallClock = WallClock;
// Capture the blocks to render
foreach (var t in all)
{
currentBlock[t] = Blocks[t][wallClock];
}
// Render each of the Media Types if it is time to do so.
foreach (var t in all)
{
// Skip rendering for nulls
if (currentBlock[t] == null)
{
continue;
}
// Render by forced signal (TimeSpan.MinValue)
if (LastRenderTime[t] == TimeSpan.MinValue)
{
renderedBlockCount[t] += SendBlockToRenderer(currentBlock[t], wallClock);
continue;
}
// Render because we simply have not rendered
if (currentBlock[t].StartTime != LastRenderTime[t])
{
renderedBlockCount[t] += SendBlockToRenderer(currentBlock[t], wallClock);
continue;
}
}
#endregion
#region 6. Finalize the Rendering Cycle
// Call the update method on all renderers so they receive what the new wall clock is.
foreach (var t in all)
{
Renderers[t]?.Update(wallClock);
}
#endregion
}
catch (ThreadAbortException) { /* swallow */ }
catch { if (!IsDisposed)
{
throw;
}
}
finally
{
// Always exit notifying the cycle is done.
BlockRenderingCycle.Set();
isRunningRenderingCycle = false;
}
#endregion
},
this, // the state argument passed on to the ticker
0,
(int)Constants.Interval.HighPriority.TotalMilliseconds);
}
/// <summary>
/// Starts the block rendering worker.
/// </summary>
private void StartBlockRenderingWorker()
{
if (HasBlockRenderingWorkerExited != null)
{
return;
}
HasBlockRenderingWorkerExited = new ManualResetEvent(false);
// Synchronized access to parts of the run cycle
var isRunningPropertyUpdates = false;
var isRunningRenderingCycle = false;
// Holds the main media type
var main = Container.Components.Main.MediaType;
// Holds the auxiliary media types
var auxs = Container.Components.MediaTypes.ExcludeMediaType(main);
// Holds all components
var all = Container.Components.MediaTypes.DeepCopy();
// Holds a snapshot of the current block to render
var currentBlock = new MediaTypeDictionary <MediaBlock>();
// Keeps track of how many blocks were rendered in the cycle.
var renderedBlockCount = new MediaTypeDictionary <int>();
// reset render times for all components
foreach (var t in all)
{
LastRenderTime[t] = TimeSpan.MinValue;
}
// Ensure the other workers are running
PacketReadingCycle.WaitOne();
FrameDecodingCycle.WaitOne();
// Set the initial clock position
Clock.Position = Blocks[main].RangeStartTime;
var wallClock = Clock.Position;
// Wait for renderers to be ready
foreach (var t in all)
{
Renderers[t]?.WaitForReadyState();
}
// The Property update timer is responsible for timely updates to properties outside of the worker threads
BlockRenderingWorker = new Timer((s) =>
{
#region Detect a Timer Stop
if (IsTaskCancellationPending || HasBlockRenderingWorkerExited.IsSet() || m_IsDisposing.Value)
{
HasBlockRenderingWorkerExited.Set();
return;
}
#endregion
#region Run the property Updates
if (isRunningPropertyUpdates == false)
{
isRunningPropertyUpdates = true;
try
{
UpdatePosition(IsOpen ? Clock?.Position ?? TimeSpan.Zero : TimeSpan.Zero);
UpdateBufferingProperties();
}
catch (Exception ex)
{
Log(MediaLogMessageType.Error, $"{nameof(BlockRenderingWorker)} callabck failed. {ex.GetType()}: {ex.Message}");
}
finally
{
isRunningPropertyUpdates = false;
}
}
#endregion
#region Run the Rendering Cycle
// Don't run the cycle if it's already running
if (isRunningRenderingCycle)
{
// TODO: Log a frame skip
return;
}
try
{
#region 1. Control and Capture
// Flag the current rendering cycle
isRunningRenderingCycle = true;
// Reset the rendered count to 0
foreach (var t in all)
{
renderedBlockCount[t] = 0;
}
// Capture current clock position for the rest of this cycle
BlockRenderingCycle.Reset();
// capture the wall clock for this cycle
wallClock = Clock.Position;
#endregion
#region 2. Handle Block Rendering
// Wait for the seek op to finish before we capture blocks
if (HasDecoderSeeked)
{
SeekingDone.WaitOne();
}
// Capture the blocks to render
foreach (var t in all)
{
currentBlock[t] = Blocks[t][wallClock];
}
// Render each of the Media Types if it is time to do so.
foreach (var t in all)
{
// Skip rendering for nulls
if (currentBlock[t] == null)
{
continue;
}
// Render by forced signal (TimeSpan.MinValue)
if (LastRenderTime[t] == TimeSpan.MinValue)
{
renderedBlockCount[t] += SendBlockToRenderer(currentBlock[t], wallClock);
continue;
}
// Render because we simply have not rendered
if (currentBlock[t].StartTime != LastRenderTime[t])
{
renderedBlockCount[t] += SendBlockToRenderer(currentBlock[t], wallClock);
continue;
}
}
#endregion
#region 6. Finalize the Rendering Cycle
// Call the update method on all renderers so they receive what the new wall clock is.
foreach (var t in all)
{
Renderers[t]?.Update(wallClock);
}
#endregion
}
catch (ThreadAbortException) { }
catch { throw; }
finally
{
// Always exit notifying the cycle is done.
BlockRenderingCycle.Set();
isRunningRenderingCycle = false;
}
#endregion
},
this, // the state argument passed on to the ticker
0,
(int)Constants.Interval.HighPriority.TotalMilliseconds);
}
