/// <summary>
/// Provides the implementation for the Play Media Command.
/// </summary>
/// <returns>True if the command was successful</returns>
private bool CommandPlayMedia()
{
if (!CanResumeMedia)
{
return(false);
}
foreach (var renderer in MediaCore.Renderers.Values)
{
renderer.Play();
}
MediaCore.ResumePlayback();
return(true);
}
/// <inheritdoc />
protected override void ExecuteCycleLogic(CancellationToken ct)
{
#region Setup the Decoding Cycle
// Update state properties -- this must be done on every cycle
// because a direct command might have changed the components
var wallClock = MediaCore.WallClock;
var main = Container.Components.MainMediaType;
MediaBlockBuffer blocks;
DecodedFrameCount = 0;
var rangePercent = 0d;
#endregion
try
{
// The 2-part logic blocks detect a sync-buffering scenario
// and then decodes the necessary frames.
if (MediaCore.HasDecodingEnded || ct.IsCancellationRequested)
{
return;
}
#region Sync-Buffering Detection
// Capture the blocks for easier readability
blocks = MediaCore.Blocks[main];
// If we are not in range then we need to enter the sync-buffering state
if (NeedsMorePackets && !MediaCore.IsSyncBuffering && blocks.IsInRange(wallClock) == false)
{
// Enter sync-buffering scenario
MediaCore.Clock.Pause();
wallClock = MediaCore.WallClock;
MediaCore.IsSyncBuffering = true;
SyncBufferStartTime = DateTime.UtcNow;
this.LogInfo(Aspects.DecodingWorker, $"SYNC-BUFFER: Started. Buffer: {State.BufferingProgress:p}. Clock: {wallClock.Format()}");
}
#endregion
#region Component Decoding
// We need to add blocks if the wall clock is over 75%
// for each of the components so that we have some buffer.
foreach (var t in Container.Components.MediaTypes)
{
if (ct.IsCancellationRequested)
{
break;
}
// Capture a reference to the blocks and the current Range Percent
const double rangePercentThreshold = 0.75d;
blocks = MediaCore.Blocks[t];
rangePercent = blocks.GetRangePercent(wallClock);
// Read as much as we can for this cycle but always within range.
while (blocks.IsFull == false || rangePercent > rangePercentThreshold)
{
if (ct.IsCancellationRequested || AddNextBlock(t) == false)
{
break;
}
DecodedFrameCount += 1;
rangePercent = blocks.GetRangePercent(wallClock);
// Determine break conditions to save CPU time
if (rangePercent > 0 &&
rangePercent <= rangePercentThreshold &&
blocks.IsFull == false &&
blocks.CapacityPercent >= 0.25d &&
blocks.IsInRange(wallClock))
{
break;
}
}
#endregion
}
}
finally
{
// Provide updates to decoding stats
State.UpdateDecodingBitRate(
MediaCore.Blocks.Values.Sum(b => b.IsInRange(wallClock) ? b.RangeBitRate : 0));
// Detect End of Decoding Scenarios
// The Rendering will check for end of media when this
// condition is set.
var hasDecodingEnded = DetectHasDecodingEnded(wallClock, DecodedFrameCount, main);
MediaCore.HasDecodingEnded = hasDecodingEnded;
// Detect if an exit from Sync Buffering is required
var mustExitSyncBuffering = MediaCore.IsSyncBuffering &&
(ct.IsCancellationRequested || hasDecodingEnded || State.BufferingProgress >= 0.95);
// Detect if we need an immediate exit from sync buffering
if (mustExitSyncBuffering || (MediaCore.IsSyncBuffering && !NeedsMorePackets))
{
blocks = MediaCore.Blocks[main];
if (blocks.Count > 0 && !blocks.IsInRange(wallClock))
{
wallClock = blocks[wallClock].StartTime;
}
MediaCore.ChangePosition(wallClock);
MediaCore.IsSyncBuffering = false;
this.LogInfo(Aspects.DecodingWorker, $"SYNC-BUFFER: Completed in {DateTime.UtcNow.Subtract(SyncBufferStartTime).TotalMilliseconds:0.0} ms");
if (State.MediaState == PlaybackStatus.Play)
{
MediaCore.ResumePlayback();
}
}
}
}
