/// <summary>
/// Start Playback
/// </summary>
/// <param name="res"></param>
public void InitPlayback(VideoBuffer videoBuffer) {
if (videoBuffer == null) {
throw new ArgumentNullException("videoBufferDescription");
}
VerifyAccess();
TimeSpan renderinterval;
try {
int fps = AppDefaults.visualSettings.ui_video_rendering_fps;
fps = (fps <= 0 || fps > 100) ? 100 : fps;
renderinterval = TimeSpan.FromMilliseconds(1000 / fps);
} catch {
renderinterval = TimeSpan.FromMilliseconds(1000 / 30);
}
var cancellationTokenSource = new CancellationTokenSource();
renderSubscription.Disposable = Disposable.Create(() => {
cancellationTokenSource.Cancel();
});
var bitmap = PrepareForRendering(videoBuffer);
var cancellationToken = cancellationTokenSource.Token;
var dispatcher = Application.Current.Dispatcher;
var renderingTask = Task.Factory.StartNew(() => {
var statistics = new CircularBuffer<long>(100);
using (videoBuffer.Lock()) {
try {
//start rendering loop
while (!cancellationToken.IsCancellationRequested) {
using (var processingEvent = new ManualResetEventSlim(false)) {
dispatcher.BeginInvoke(() => {
using (Disposable.Create(() => processingEvent.Set())) {
if (!cancellationToken.IsCancellationRequested) {
//update statisitc info
statistics.Enqueue(Stopwatch.GetTimestamp());
//evaluate averange rendering fps
var ticksEllapsed = statistics.last - statistics.first;
double avgFps = 0;
if (ticksEllapsed > 0) {
avgFps = ((double)statistics.length * (double)Stopwatch.Frequency) / (double)ticksEllapsed;
}
//render farme to screen
DrawFrame(bitmap, videoBuffer, avgFps);
}
}
});
processingEvent.Wait(cancellationToken);
}
cancellationToken.WaitHandle.WaitOne(renderinterval);
}
} catch (OperationCanceledException) {
//swallow exception
} catch (Exception error) {
dbg.Error(error);
}
}
}, cancellationToken);
}
private void DrawFrame(WriteableBitmap bitmap, VideoBuffer videoBuffer, double averangeFps) {
VerifyAccess();
if (isPaused) {
return;
}
bitmap.Lock();
try {
using (var ptr = videoBuffer.Lock()) {
bitmap.WritePixels(
new Int32Rect(0, 0, videoBuffer.width, videoBuffer.height),
ptr.value, videoBuffer.size, videoBuffer.stride,
0, 0
);
}
} finally {
bitmap.Unlock();
}
fpsCaption.Text = averangeFps.ToString("F1");
}
/// <summary>
/// Initiate rendering loop
/// </summary>
/// <param name="videoBuffer"></param>
public void InitPlayback(VideoBuffer videoBuffer) {
if (videoBuffer == null) {
throw new ArgumentNullException("videoBufferDescription");
}
VerifyAccess();
TimeSpan renderinterval;
try {
int fps = AppDefaults.visualSettings.ui_video_rendering_fps;
fps = (fps <= 0 || fps > 100) ? 100 : fps;
renderinterval = TimeSpan.FromMilliseconds(1000 / fps);
} catch {
renderinterval = TimeSpan.FromMilliseconds(1000 / 30);
}
var cancellationTokenSource = new CancellationTokenSource();
renderSubscription.Disposable = Disposable.Create(() => {
cancellationTokenSource.Cancel();
});
var bitmap = PrepareForRendering(videoBuffer);
var cancellationToken = cancellationTokenSource.Token;
var dispatcher = this.Dispatcher; //Application.Current.Dispatcher;
var renderingTask = Task.Factory.StartNew(() => {
var statistics = PlaybackStatistics.Start();
using (videoBuffer.Lock()) {
try {
//start rendering loop
while (!cancellationToken.IsCancellationRequested) {
using (var processingEvent = new ManualResetEventSlim(false)) {
dispatcher.BeginInvoke(() => {
using (Disposable.Create(() => processingEvent.Set())) {
if (!cancellationToken.IsCancellationRequested) {
//update statisitc info
statistics.Update(videoBuffer);
//render farme to screen
DrawFrame(bitmap, videoBuffer, statistics);
}
}
});
processingEvent.Wait(cancellationToken);
}
cancellationToken.WaitHandle.WaitOne(renderinterval);
}
} catch (OperationCanceledException) {
//swallow exception
} catch (Exception error) {
dbg.Error(error);
}
}
}, cancellationToken);
}
private void DrawFrame(WriteableBitmap bitmap, VideoBuffer videoBuffer, PlaybackStatistics statistics) {
VerifyAccess();
if (isPaused) {
return;
}
using (var md = videoBuffer.Lock()) {
// internally calls lock\unlock, uses MILUtilities.MILCopyPixelBuffer
bitmap.WritePixels(
new Int32Rect(0, 0, videoBuffer.width, videoBuffer.height),
md.value.scan0Ptr, videoBuffer.size, videoBuffer.stride,
0, 0
);
}
renderingFps.Text = String.Format("rendering fps: {0:F1}", statistics.avgRenderingFps);
decodingFps.Text = String.Format("decoding fps: {0:F1}", statistics.avgDecodingFps);
noSignalPanel.Visibility =
statistics.isNoSignal ? Visibility.Visible : Visibility.Hidden;
}
public void Update(VideoBuffer videoBuffer) {
//update rendering times history
renderTimes.Enqueue(Stopwatch.GetTimestamp());
//evaluate averange rendering fps
avgRenderingFps = CalculateAvgFpsFromTimes(renderTimes);
//update no signal indicator
using (var md = videoBuffer.Lock()) {
signal = md.value.signal;
md.value.signal = 0;
}
UpdateNoSignal();
//evaluate averange rendering fps
avgDecodingFps = CalculateAvgFpsFromTimes(decodeTimes);
}