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Set the vendor.qti-ext-dec-low-latency.enable Qualcomm vendor extension

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This commit is contained in:
Cameron Gutman 2020-02-22 17:06:32 -08:00
parent 3011a5bad7
commit 81b6a8a311
2 changed files with 27 additions and 0 deletions
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12
app/src/main/java/com/limelight/binding/video/MediaCodecDecoderRenderer.java
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@ -319,6 +319,18 @@ public class MediaCodecDecoderRenderer extends VideoDecoderRenderer {
videoFormat.setInteger(MediaCodecHelper.KEY_LOW_LATENCY, 1);
}
else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// Set the Qualcomm vendor low latency extension if the Android R option is unavailable
if (MediaCodecHelper.decoderSupportsQcomVendorLowLatency(selectedDecoderName)) {
// MediaCodec supports vendor-defined format keys using the "vendor.<extension name>.<parameter name>" syntax.
// These allow access to functionality that is not exposed through documented MediaFormat.KEY_* values.
// https://cs.android.com/android/platform/superproject/+/master:hardware/qcom/sdm845/media/mm-video-v4l2/vidc/common/inc/vidc_vendor_extensions.h;l=67
//
// Examples of Qualcomm's vendor extensions for Snapdragon 845:
// https://cs.android.com/android/platform/superproject/+/master:hardware/qcom/sdm845/media/mm-video-v4l2/vidc/vdec/src/omx_vdec_extensions.hpp
// https://cs.android.com/android/_/android/platform/hardware/qcom/sm8150/media/+/0621ceb1c1b19564999db8293574a0e12952ff6c
videoFormat.setInteger("vendor.qti-ext-dec-low-latency.enable", 1);
}
// Operate at maximum rate to lower latency as much as possible on
// some Qualcomm platforms. We could also set KEY_PRIORITY to 0 (realtime)
// but that will actually result in the decoder crashing if it can't satisfy

15
app/src/main/java/com/limelight/binding/video/MediaCodecHelper.java
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@ -38,6 +38,7 @@ public class MediaCodecHelper {
private static final List<String> refFrameInvalidationHevcPrefixes;
private static final List<String> blacklisted49FpsDecoderPrefixes;
private static final List<String> blacklisted59FpsDecoderPrefixes;
private static final List<String> qualcommDecoderPrefixes;
// FIXME: Remove when Android R SDK is finalized
public static final String FEATURE_LowLatency = "low-latency";
@ -193,6 +194,13 @@ public class MediaCodecHelper {
}
}
static {
qualcommDecoderPrefixes = new LinkedList<>();
qualcommDecoderPrefixes.add("omx.qcom");
qualcommDecoderPrefixes.add("c2.qti");
}
private static boolean isPowerVR(String glRenderer) {
return glRenderer.toLowerCase().contains("powervr");
}
@ -376,6 +384,13 @@ public class MediaCodecHelper {
return false;
}
public static boolean decoderSupportsQcomVendorLowLatency(String decoderName) {
// MediaCodec vendor extension support was introduced in Android 8.0:
// https://cs.android.com/android/_/android/platform/frameworks/av/+/01c10f8cdcd58d1e7025f426a72e6e75ba5d7fc2
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.O &&
isDecoderInList(qualcommDecoderPrefixes, decoderName);
}
public static boolean decoderNeedsConstrainedHighProfile(String decoderName) {
return isDecoderInList(constrainedHighProfilePrefixes, decoderName);
}