Cap pts gap between adjacent frames to specified value

- In the scenario of cast mirroring, encoding could be suspended
  for prolonged periods. Limiting the pts gap to workaround the
  problem where encoder's rate control logic produces huge frames
  after a long period of suspension.

- Repeat last frame a couple more times to get better quality
  on static scenes.

- Fix the timestamp on repeat frames (it was not set)

Bug: 11971963
Change-Id: I1d68ab3d269874bf3921aa429a985c5f63e428c7
(cherry picked from commit 94ee4b708acfa941581160b267afb79192b1d816)

1 files changed, 21 insertions, 1 deletions

diff --git a/media/libstagefright/ACodec.cpp b/media/libstagefright/ACodec.cpp
index 3810ac1..9276818 100644
--- a/media/libstagefright/ACodec.cpp
+++ b/media/libstagefright/ACodec.cpp
@@ -371,7 +371,8 @@ ACodec::ACodec()
       mDequeueCounter(0),
       mStoreMetaDataInOutputBuffers(false),
       mMetaDataBuffersToSubmit(0),
-      mRepeatFrameDelayUs(-1ll) {
+      mRepeatFrameDelayUs(-1ll),
+      mMaxPtsGapUs(-1l) {
     mUninitializedState = new UninitializedState(this);
     mLoadedState = new LoadedState(this);
     mLoadedToIdleState = new LoadedToIdleState(this);
@@ -1109,6 +1110,10 @@ status_t ACodec::configureCodec(
                     &mRepeatFrameDelayUs)) {
             mRepeatFrameDelayUs = -1ll;
         }
+
+        if (!msg->findInt64("max-pts-gap-to-encoder", &mMaxPtsGapUs)) {
+            mMaxPtsGapUs = -1l;
+        }
     }
 
     // Always try to enable dynamic output buffers on native surface
@@ -3855,6 +3860,21 @@ void ACodec::LoadedState::onCreateInputSurface(
         }
     }
 
+    if (err == OK && mCodec->mMaxPtsGapUs > 0l) {
+        err = mCodec->mOMX->setInternalOption(
+                mCodec->mNode,
+                kPortIndexInput,
+                IOMX::INTERNAL_OPTION_MAX_TIMESTAMP_GAP,
+                &mCodec->mMaxPtsGapUs,
+                sizeof(mCodec->mMaxPtsGapUs));
+
+        if (err != OK) {
+            ALOGE("[%s] Unable to configure max timestamp gap (err %d)",
+                  mCodec->mComponentName.c_str(),
+                  err);
+        }
+    }
+
     if (err == OK) {
         notify->setObject("input-surface",
                 new BufferProducerWrapper(bufferProducer));