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Use frame drop hack to reduce latency and micro-stuttering for now

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This commit is contained in:
Cameron Gutman 2018-02-04 12:59:04 -08:00
parent 82387d23f8
commit c797318ece
2 changed files with 27 additions and 2 deletions
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25
app/src/main/java/com/limelight/Game.java
View File

@ -309,6 +309,31 @@ public class Game extends Activity implements SurfaceHolder.Callback,
float displayRefreshRate = prepareDisplayForRendering();
LimeLog.info("Display refresh rate: "+displayRefreshRate);
// HACK: Despite many efforts to ensure low latency consistent frame
// delivery, the best non-lossy mechanism is to buffer 1 extra frame
// in the output pipeline. Android does some buffering on its end
// in SurfaceFlinger and it's difficult (impossible?) to inspect
// the precise state of the buffer queue to the screen after we
// release a frame for rendering.
//
// Since buffering a frame adds latency and we are primarily a
// latency-optimized client, rather than one designed for picture-perfect
// accuracy, we will synthetically induce a negative pressure on the display
// output pipeline by driving the decoder input pipeline under the speed
// that the display can refresh. This ensures a constant negative pressure
// to keep latency down but does induce a periodic frame loss. However, this
// periodic frame loss is *way* less than what we'd already get in Marshmallow's
// display pipeline where frames are dropped outside of our control if they land
// on the same V-sync.
//
// Hopefully, we can get rid of this once someone comes up with a better way
// to track the state of the pipeline and time frames.
int roundedRefreshRate = Math.round(displayRefreshRate);
if (!prefConfig.disableFrameDrop && prefConfig.fps >= roundedRefreshRate) {
prefConfig.fps = roundedRefreshRate - 1;
LimeLog.info("Adjusting FPS target for screen to "+prefConfig.fps);
}
StreamConfiguration config = new StreamConfiguration.Builder()
.setResolution(prefConfig.width, prefConfig.height)
.setRefreshRate(prefConfig.fps)

2
app/src/main/java/com/limelight/binding/video/MediaCodecDecoderRenderer.java
View File

@ -410,7 +410,7 @@ public class MediaCodecDecoderRenderer extends VideoDecoderRenderer {
}
// Render the last buffer
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && prefs.disableFrameDrop) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
// Use a PTS that will cause this frame to never be dropped if frame dropping
// is disabled
videoDecoder.releaseOutputBuffer(lastIndex, 0);