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Set constraint flags corresponding to Constrained High Profile on KitKat and higher. Fixes Nexus Player high latency on Android 6.0.

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This commit is contained in:
Cameron Gutman 2015-10-10 23:28:48 -07:00
parent 87a9ca4318
commit fd12e30c53
2 changed files with 24 additions and 2 deletions
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19
app/src/main/java/com/limelight/binding/video/MediaCodecDecoderRenderer.java
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@ -535,6 +535,25 @@ public class MediaCodecDecoderRenderer extends EnhancedDecoderRenderer {
sps.vuiParams.bitstreamRestriction = null;
}
// Set constraint flags 4 & 5 to make this Constrained High Profile
// which allows the decoder to assume there will be no B-frames and
// reduce delay and buffering accordingly.
//
// This profile is fairly new (standardized in H264 revision 2012-06) and
// it's known that at least some devices don't like these previously unused
// constraints being set. To minimize the chance of interfering with old devices,
// I'm only setting these on KitKat or higher. It's an arbitrary limitation and could
// change if it causes problems.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
sps.constraint_set_4_flag = true;
sps.constraint_set_5_flag = true;
}
else {
// Force the constraints unset for < 4.4 (some may be set by default)
sps.constraint_set_4_flag = false;
sps.constraint_set_5_flag = false;
}
// If we need to hack this SPS to say we're baseline, do so now
if (needsBaselineSpsHack) {
LimeLog.info("Hacking SPS to baseline");

7
decoder-errata.txt
View File

@ -21,5 +21,8 @@ This file serves to document some of the decoder errata when using MediaCodec ha
7. Some decoders will not enter low latency mode if adaptive playback is enabled
- Affected decoders: Intel decoder in Nexus Player
8. Some decoders will not enter low latency mode if the profile isn't baseline in the first SPS.
- Affected decoders: Intel decoder in Nexus Player
8. Some decoders will not enter low latency mode if the profile isn't baseline in the first SPS because B-frames may be present.
- Affected decoders: Intel decoder in Nexus Player (prior to Android 6.0)
9. Some decoders will not enter low latency mode if the profile isn't constrained high profile because B-frames may be present.
- Affected decoders: Intel decoder in Nexus Player (after Android 6.0)