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Use the new L+ releaseOutputBuffer() that takes a PTS to reduce microstuttering on M and reduce latency on L

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This commit is contained in:
Cameron Gutman 2017-06-03 07:47:15 -07:00
parent a96f688bb2
commit 91261f9520
1 changed files with 22 additions and 1 deletions
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23
app/src/main/java/com/limelight/binding/video/MediaCodecDecoderRenderer.java
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@ -24,6 +24,17 @@ public class MediaCodecDecoderRenderer extends VideoDecoderRenderer {
private static final boolean USE_FRAME_RENDER_TIME = false;
// This value is added to the PTS for each frame to force frames delivered right at
// V-sync time to be delayed until the next V-sync rather than dropping the existing frame.
// To make matters worse, these frames often end up being displayed for 2 V-syncs because
// the next frame isn't ready at the next V-sync. So without this, we end up with a pattern of:
// F0 - Displayed | F1 - Dropped | F2 - Displayed | F2 - Displayed again | F3 - Displayed ...
// which can be very noticeable for some video content and users.
//
// This value is currently 6 ms, which means that a frame ready for display less than 6 ms from
// the next V-sync will be delayed until the following V-sync to ensure smooth frame pacing.
private static final int PTS_OFFSET_NS = 6 * 1000000;
// Used on versions < 5.0
private ByteBuffer[] legacyInputBuffers;
@ -316,7 +327,17 @@ public class MediaCodecDecoderRenderer extends VideoDecoderRenderer {
}
// Render the last buffer
videoDecoder.releaseOutputBuffer(lastIndex, true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
// On L and later, we can fine tune our PTS right before rendering, so
// we take advantage of that for frame pacing using the PTS offset. Using
// this version of releaseOutputBuffer() also lets SurfaceFlinger drop extra
// frames in the SurfaceView<->SurfaceFlinger BufferQueue that reduces
// latency if an stray extra frame ends up in the output queue.
videoDecoder.releaseOutputBuffer(lastIndex, System.nanoTime() + PTS_OFFSET_NS);
}
else {
videoDecoder.releaseOutputBuffer(lastIndex, true);
}
// Add delta time to the totals (excluding probable outliers)
long delta = MediaCodecHelper.getMonotonicMillis() - (presentationTimeUs / 1000);