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Add workaround for MITV4-ANSM0 low latency mode bug

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Fixes #1122
This commit is contained in:
Cameron Gutman
2022-09-08 17:43:17 -05:00
parent 09f0913974
commit 3913e845fa
1 changed files with 5 additions and 1 deletions
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6
app/src/main/java/com/limelight/binding/video/MediaCodecHelper.java
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@@ -449,13 +449,17 @@ public class MediaCodecHelper {
}
}
if (tryNumber < 2) {
if (tryNumber < 2 &&
(!Build.MANUFACTURER.equalsIgnoreCase("xiaomi") || Build.VERSION.SDK_INT > Build.VERSION_CODES.M)) {
// MediaTek decoders don't use vendor-defined keys for low latency mode. Instead, they have a modified
// version of AOSP's ACodec.cpp which supports the "vdec-lowlatency" option. This option is passed down
// to the decoder as OMX.MTK.index.param.video.LowLatencyDecode.
//
// This option is also plumbed for Amazon Amlogic-based devices like the Fire TV 3. Not only does it
// reduce latency on Amlogic, it fixes the HEVC bug that causes the decoder to not output any frames.
// Unfortunately, it does the exact opposite for the Xiaomi MITV4-ANSM0, breaking it in the way that
// Fire TV was broken prior to vdec-lowlatency :(
//
// On Fire TV 3, vdec-lowlatency is translated to OMX.amazon.fireos.index.video.lowLatencyDecode.
//
// https://github.com/yuan1617/Framwork/blob/master/frameworks/av/media/libstagefright/ACodec.cpp