Camera3: Use proper timestamp clock domain for different streams
If buffer consumers assume different clock domain compared to the camera
output, camera3 device uses the offset between the clock domains to convert
the timestamp.
Bug: 27153476
Change-Id: Iaae33281411cb27b639e87b0dad957d640182898
diff --git a/services/camera/libcameraservice/device3/Camera3Device.cpp b/services/camera/libcameraservice/device3/Camera3Device.cpp
index cac82f3..b524f61 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.cpp
+++ b/services/camera/libcameraservice/device3/Camera3Device.cpp
@@ -64,6 +64,7 @@
mStatusWaiters(0),
mUsePartialResult(false),
mNumPartialResults(1),
+ mTimestampOffset(0),
mNextResultFrameNumber(0),
mNextReprocessResultFrameNumber(0),
mNextShutterFrameNumber(0),
@@ -204,6 +205,14 @@
mNeedConfig = true;
mPauseStateNotify = false;
+ // Measure the clock domain offset between camera and video/hw_composer
+ camera_metadata_entry timestampSource =
+ mDeviceInfo.find(ANDROID_SENSOR_INFO_TIMESTAMP_SOURCE);
+ if (timestampSource.count > 0 && timestampSource.data.u8[0] ==
+ ANDROID_SENSOR_INFO_TIMESTAMP_SOURCE_REALTIME) {
+ mTimestampOffset = getMonoToBoottimeOffset();
+ }
+
// Will the HAL be sending in early partial result metadata?
if (mDeviceVersion >= CAMERA_DEVICE_API_VERSION_3_2) {
camera_metadata_entry partialResultsCount =
@@ -382,6 +391,24 @@
return Size(maxJpegWidth, maxJpegHeight);
}
+nsecs_t Camera3Device::getMonoToBoottimeOffset() {
+ // try three times to get the clock offset, choose the one
+ // with the minimum gap in measurements.
+ const int tries = 3;
+ nsecs_t bestGap, measured;
+ for (int i = 0; i < tries; ++i) {
+ const nsecs_t tmono = systemTime(SYSTEM_TIME_MONOTONIC);
+ const nsecs_t tbase = systemTime(SYSTEM_TIME_BOOTTIME);
+ const nsecs_t tmono2 = systemTime(SYSTEM_TIME_MONOTONIC);
+ const nsecs_t gap = tmono2 - tmono;
+ if (i == 0 || gap < bestGap) {
+ bestGap = gap;
+ measured = tbase - ((tmono + tmono2) >> 1);
+ }
+ }
+ return measured;
+}
+
ssize_t Camera3Device::getJpegBufferSize(uint32_t width, uint32_t height) const {
// Get max jpeg size (area-wise).
Size maxJpegResolution = getMaxJpegResolution();
@@ -992,7 +1019,8 @@
}
}
newStream = new Camera3OutputStream(mNextStreamId, consumer,
- width, height, blobBufferSize, format, dataSpace, rotation, streamSetId);
+ width, height, blobBufferSize, format, dataSpace, rotation,
+ mTimestampOffset, streamSetId);
} else if (format == HAL_PIXEL_FORMAT_RAW_OPAQUE) {
ssize_t rawOpaqueBufferSize = getRawOpaqueBufferSize(width, height);
if (rawOpaqueBufferSize <= 0) {
@@ -1000,10 +1028,12 @@
return BAD_VALUE;
}
newStream = new Camera3OutputStream(mNextStreamId, consumer,
- width, height, rawOpaqueBufferSize, format, dataSpace, rotation, streamSetId);
+ width, height, rawOpaqueBufferSize, format, dataSpace, rotation,
+ mTimestampOffset, streamSetId);
} else {
newStream = new Camera3OutputStream(mNextStreamId, consumer,
- width, height, format, dataSpace, rotation, streamSetId);
+ width, height, format, dataSpace, rotation,
+ mTimestampOffset, streamSetId);
}
newStream->setStatusTracker(mStatusTracker);