Re-enable frame dropping for non-auto timestamps
This change adds an entire field to note whether the timestamp was
auto-generated by Surface or supplied by the application.
The value is used when deciding whether or not to drop frames based
on buffer presentation timestamps. If a desired presentation time
was set explicitly, BufferQueue will use that value to decide if a
frame should be dropped. If the timestamp was generated by Surface
at the time the buffer was queued, the timestamp is ignored.
Bug 10151804
Change-Id: Ibd571a7578351063b813cbdad2ddbeed70655ba5
diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index 033c2a6..65007fa 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -475,10 +475,12 @@
uint32_t transform;
int scalingMode;
int64_t timestamp;
+ bool isAutoTimestamp;
bool async;
sp<Fence> fence;
- input.deflate(×tamp, &crop, &scalingMode, &transform, &async, &fence);
+ input.deflate(×tamp, &isAutoTimestamp, &crop, &scalingMode, &transform,
+ &async, &fence);
if (fence == NULL) {
ST_LOGE("queueBuffer: fence is NULL");
@@ -558,6 +560,7 @@
item.mTransform = transform;
item.mScalingMode = scalingMode;
item.mTimestamp = timestamp;
+ item.mIsAutoTimestamp = isAutoTimestamp;
item.mFrameNumber = mFrameCounter;
item.mBuf = buf;
item.mFence = fence;
@@ -860,7 +863,12 @@
//
// NOTE: code assumes monotonic time values from the system clock are
// positive.
- while (false && mQueue.size() > 1) {
+
+ // Start by checking to see if we can drop frames. We skip this check
+ // if the timestamps are being auto-generated by Surface -- if the
+ // app isn't generating timestamps explicitly, they probably don't
+ // want frames to be discarded based on them.
+ while (mQueue.size() > 1 && !mQueue[0].mIsAutoTimestamp) {
// If entry[1] is timely, drop entry[0] (and repeat). We apply
// an additional criteria here: we only drop the earlier buffer if
// our desiredPresent falls within +/- 1 second of the expected
diff --git a/libs/gui/IGraphicBufferConsumer.cpp b/libs/gui/IGraphicBufferConsumer.cpp
index 6d65016..4db635c 100644
--- a/libs/gui/IGraphicBufferConsumer.cpp
+++ b/libs/gui/IGraphicBufferConsumer.cpp
@@ -43,6 +43,7 @@
mTransform(0),
mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
mTimestamp(0),
+ mIsAutoTimestamp(false),
mFrameNumber(0),
mBuf(INVALID_BUFFER_SLOT),
mIsDroppable(false),
@@ -55,6 +56,7 @@
sizeof(mTransform) +
sizeof(mScalingMode) +
sizeof(mTimestamp) +
+ sizeof(mIsAutoTimestamp) +
sizeof(mFrameNumber) +
sizeof(mBuf) +
sizeof(mIsDroppable) +
@@ -123,6 +125,7 @@
FlattenableUtils::write(buffer, size, mTransform);
FlattenableUtils::write(buffer, size, mScalingMode);
FlattenableUtils::write(buffer, size, mTimestamp);
+ FlattenableUtils::write(buffer, size, mIsAutoTimestamp);
FlattenableUtils::write(buffer, size, mFrameNumber);
FlattenableUtils::write(buffer, size, mBuf);
FlattenableUtils::write(buffer, size, mIsDroppable);
@@ -163,6 +166,7 @@
FlattenableUtils::read(buffer, size, mTransform);
FlattenableUtils::read(buffer, size, mScalingMode);
FlattenableUtils::read(buffer, size, mTimestamp);
+ FlattenableUtils::read(buffer, size, mIsAutoTimestamp);
FlattenableUtils::read(buffer, size, mFrameNumber);
FlattenableUtils::read(buffer, size, mBuf);
FlattenableUtils::read(buffer, size, mIsDroppable);
diff --git a/libs/gui/IGraphicBufferProducer.cpp b/libs/gui/IGraphicBufferProducer.cpp
index e3d2a20..3080220 100644
--- a/libs/gui/IGraphicBufferProducer.cpp
+++ b/libs/gui/IGraphicBufferProducer.cpp
@@ -269,6 +269,7 @@
size_t IGraphicBufferProducer::QueueBufferInput::getFlattenedSize() const {
return sizeof(timestamp)
+ + sizeof(isAutoTimestamp)
+ sizeof(crop)
+ sizeof(scalingMode)
+ sizeof(transform)
@@ -287,6 +288,7 @@
return NO_MEMORY;
}
FlattenableUtils::write(buffer, size, timestamp);
+ FlattenableUtils::write(buffer, size, isAutoTimestamp);
FlattenableUtils::write(buffer, size, crop);
FlattenableUtils::write(buffer, size, scalingMode);
FlattenableUtils::write(buffer, size, transform);
@@ -299,6 +301,7 @@
{
size_t minNeeded =
sizeof(timestamp)
+ + sizeof(isAutoTimestamp)
+ sizeof(crop)
+ sizeof(scalingMode)
+ sizeof(transform)
@@ -309,6 +312,7 @@
}
FlattenableUtils::read(buffer, size, timestamp);
+ FlattenableUtils::read(buffer, size, isAutoTimestamp);
FlattenableUtils::read(buffer, size, crop);
FlattenableUtils::read(buffer, size, scalingMode);
FlattenableUtils::read(buffer, size, transform);
diff --git a/libs/gui/Surface.cpp b/libs/gui/Surface.cpp
index f3a7e5e..b9a12ed 100644
--- a/libs/gui/Surface.cpp
+++ b/libs/gui/Surface.cpp
@@ -262,8 +262,10 @@
ALOGV("Surface::queueBuffer");
Mutex::Autolock lock(mMutex);
int64_t timestamp;
+ bool isAutoTimestamp = false;
if (mTimestamp == NATIVE_WINDOW_TIMESTAMP_AUTO) {
timestamp = systemTime(SYSTEM_TIME_MONOTONIC);
+ isAutoTimestamp = true;
ALOGV("Surface::queueBuffer making up timestamp: %.2f ms",
timestamp / 1000000.f);
} else {
@@ -281,8 +283,8 @@
sp<Fence> fence(fenceFd >= 0 ? new Fence(fenceFd) : Fence::NO_FENCE);
IGraphicBufferProducer::QueueBufferOutput output;
- IGraphicBufferProducer::QueueBufferInput input(timestamp, crop, mScalingMode,
- mTransform, mSwapIntervalZero, fence);
+ IGraphicBufferProducer::QueueBufferInput input(timestamp, isAutoTimestamp,
+ crop, mScalingMode, mTransform, mSwapIntervalZero, fence);
status_t err = mGraphicBufferProducer->queueBuffer(i, input, &output);
if (err != OK) {
ALOGE("queueBuffer: error queuing buffer to SurfaceTexture, %d", err);