/// <summary>
/// Provides the implementation for the Pause Media Command.
/// </summary>
/// <returns>True if the command was successful</returns>
private bool CommandPauseMedia()
{
if (State.CanPause == false)
{
return(false);
}
MediaCore.Clock.Pause();
foreach (var renderer in MediaCore.Renderers.Values)
{
renderer.Pause();
}
MediaCore.ChangePosition(SnapPositionToBlockPosition(MediaCore.WallClock));
State.UpdateMediaState(PlaybackStatus.Pause);
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();
}
}
}
}
/// <inheritdoc />
protected override void ExecuteCycleLogic(CancellationToken ct)
{
// Update Status Properties
var main = Container.Components.MainMediaType;
var all = MediaCore.Renderers.Keys.ToArray();
var currentBlock = new MediaTypeDictionary <MediaBlock>();
if (HasInitialized == false)
{
// wait for main component blocks or EOF or cancellation pending
if (MediaCore.Blocks[main].Count <= 0)
{
return;
}
// Set the initial clock position
MediaCore.ChangePosition(MediaCore.Blocks[main].RangeStartTime);
// Wait for renderers to be ready
foreach (var t in all)
{
MediaCore.Renderers[t]?.WaitForReadyState();
}
// Mark as initialized
HasInitialized.Value = true;
}
#region Run the Rendering Cycle
try
{
// TODO: wait for active seek command
try { Commands.WaitForSeekBlocks(ct); }
catch { return; }
#region 2. Handle Block Rendering
// capture the wall clock for this cycle
var wallClock = MediaCore.WallClock;
// Capture the blocks to render
foreach (var t in all)
{
// Get the audio, video, or subtitle block to render
currentBlock[t] = t == MediaType.Subtitle && MediaCore.PreloadedSubtitles != null ?
MediaCore.PreloadedSubtitles[wallClock] :
MediaCore.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 || currentBlock[t].IsDisposed)
{
continue;
}
// Render by forced signal (TimeSpan.MinValue) or because simply it is time to do so
if (MediaCore.LastRenderTime[t] == TimeSpan.MinValue || currentBlock[t].StartTime != MediaCore.LastRenderTime[t])
{
SendBlockToRenderer(currentBlock[t], wallClock);
}
}
#endregion
#region 3. 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)
{
MediaCore.Renderers[t]?.Update(wallClock);
}
#endregion
}
catch (Exception ex)
{
MediaCore.LogError(Aspects.RenderingWorker, "Error while in rendering worker cycle", ex);
throw;
}
finally
{
// Check End of Media Scenarios
if (MediaCore.HasDecodingEnded &&
Commands.IsSeeking == false &&
MediaCore.WallClock >= MediaCore.LastRenderTime[main] &&
MediaCore.WallClock >= MediaCore.Blocks[main].RangeEndTime)
{
// Rendered all and nothing else to render
if (State.HasMediaEnded == false)
{
MediaCore.Clock.Pause();
var endPosition = MediaCore.ChangePosition(MediaCore.Blocks[main].RangeEndTime);
State.UpdateMediaEnded(true, endPosition);
State.UpdateMediaState(PlaybackStatus.Stop);
foreach (var mt in Container.Components.MediaTypes)
{
MediaCore.InvalidateRenderer(mt);
}
}
}
else
{
State.UpdateMediaEnded(false, TimeSpan.Zero);
}
// Update the Position
if (!ct.IsCancellationRequested)
{
State.UpdatePosition();
}
}
#endregion
}
/// <inheritdoc />
protected override void ExecuteCycleLogic(CancellationToken ct)
{
// Update Status Properties
var main = Container.Components.MainMediaType;
var all = MediaCore.Renderers.Keys.ToArray();
var currentBlock = new MediaTypeDictionary <MediaBlock>();
if (HasInitialized == false)
{
// wait for main component blocks or EOF or cancellation pending
if (MediaCore.Blocks[main].Count <= 0)
{
return;
}
// Set the initial clock position
MediaCore.ChangePosition(MediaCore.Blocks[main].RangeStartTime);
// Wait for renderers to be ready
foreach (var t in all)
{
MediaCore.Renderers[t]?.WaitForReadyState();
}
// Mark as initialized
HasInitialized.Value = true;
}
#region Run the Rendering Cycle
try
{
#region 1. Wait for any seek operation to make blocks available in a loop
while (!ct.IsCancellationRequested &&
Commands.IsActivelySeeking &&
!MediaCore.Blocks[main].IsInRange(MediaCore.WallClock))
{
// Check if we finally have seek blocks available
// if we don't get seek blocks in range and we are not step-seeking,
// then we simply break out of the loop and render whatever it is we have
// to create the illussion of smooth seeking. For precision seeking we
// continue the loop.
if (!Commands.WaitForSeekBlocks(DefaultPeriod.Milliseconds) &&
Commands.ActiveSeekMode == CommandManager.SeekMode.Normal)
{
break;
}
}
#endregion
#region 2. Handle Block Rendering
// Capture the blocks to render at a fixed wall clock position
// so all blocks are aligned to the same timestamp
var wallClock = MediaCore.WallClock;
foreach (var t in all)
{
// skip blocks if we are seeking and they are not video blocks
if (Commands.IsSeeking && t != MediaType.Video)
{
currentBlock[t] = null;
continue;
}
// Get the audio, video, or subtitle block to render
currentBlock[t] = t == MediaType.Subtitle && MediaCore.PreloadedSubtitles != null ?
MediaCore.PreloadedSubtitles[wallClock] :
MediaCore.Blocks[t][wallClock];
}
// Render each of the Media Types if it is time to do so.
foreach (var t in all)
{
// Don't send null blocks to renderer
if (currentBlock[t] == null || currentBlock[t].IsDisposed)
{
continue;
}
// Render by forced signal (TimeSpan.MinValue) or because simply it is time to do so
if (MediaCore.LastRenderTime[t] == TimeSpan.MinValue || currentBlock[t].StartTime != MediaCore.LastRenderTime[t])
{
SendBlockToRenderer(currentBlock[t], wallClock);
}
}
#endregion
#region 3. 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)
{
MediaCore.Renderers[t]?.Update(wallClock);
}
#endregion
}
catch (Exception ex)
{
MediaCore.LogError(Aspects.RenderingWorker, "Error while in rendering worker cycle", ex);
throw;
}
finally
{
// Check End of Media Scenarios
if (Commands.IsSeeking == false &&
MediaCore.HasDecodingEnded &&
MediaCore.WallClock >= MediaCore.LastRenderTime[main] &&
MediaCore.WallClock >= MediaCore.Blocks[main].RangeEndTime)
{
// Rendered all and nothing else to render
if (State.HasMediaEnded == false)
{
MediaCore.Clock.Pause();
var endPosition = MediaCore.ChangePosition(MediaCore.Blocks[main].RangeEndTime);
State.UpdateMediaEnded(true, endPosition);
State.UpdateMediaState(PlaybackStatus.Stop);
foreach (var mt in Container.Components.MediaTypes)
{
MediaCore.InvalidateRenderer(mt);
}
}
}
else
{
State.UpdateMediaEnded(false, TimeSpan.Zero);
}
// Update the Position
if (!ct.IsCancellationRequested && Commands.IsSeeking == false)
{
State.UpdatePosition();
}
}
#endregion
}
