Camera: Wait until the current request id appears in the results
Camera preview stop only waits until the
current capture request is sent to Hal and
then immediately flushes the device.
Depending on timing and the pending request
queue size within CameraHal the current camera
client parameters may get flushed before
they are able to reach the end of the
processing pipeline.
Avoid this by waiting for the current request
id to appear in the incoming results.
Bug: 139330668
Test: Camera CTS, manual using application
Change-Id: I18de85557e8e76bfbe6d69b1eb2a5c36ed64e803
diff --git a/services/camera/libcameraservice/api1/Camera2Client.cpp b/services/camera/libcameraservice/api1/Camera2Client.cpp
index eb599e0..e996e83 100644
--- a/services/camera/libcameraservice/api1/Camera2Client.cpp
+++ b/services/camera/libcameraservice/api1/Camera2Client.cpp
@@ -959,6 +959,11 @@
case Parameters::RECORD:
case Parameters::PREVIEW:
syncWithDevice();
+ // Due to flush a camera device sync is not a sufficient
+ // guarantee that the current client parameters are
+ // correctly applied. To resolve this wait for the current
+ // request id to return in the results.
+ waitUntilCurrentRequestIdLocked();
res = stopStream();
if (res != OK) {
ALOGE("%s: Camera %d: Can't stop streaming: %s (%d)",
@@ -2259,6 +2264,46 @@
return INVALID_OPERATION;
}
+status_t Camera2Client::waitUntilCurrentRequestIdLocked() {
+ int32_t activeRequestId = mStreamingProcessor->getActiveRequestId();
+ if (activeRequestId != 0) {
+ auto res = waitUntilRequestIdApplied(activeRequestId,
+ mDevice->getExpectedInFlightDuration());
+ if (res == TIMED_OUT) {
+ ALOGE("%s: Camera %d: Timed out waiting for current request id to return in results!",
+ __FUNCTION__, mCameraId);
+ return res;
+ } else if (res != OK) {
+ ALOGE("%s: Camera %d: Error while waiting for current request id to return in results!",
+ __FUNCTION__, mCameraId);
+ return res;
+ }
+ }
+
+ return OK;
+}
+
+status_t Camera2Client::waitUntilRequestIdApplied(int32_t requestId, nsecs_t timeout) {
+ Mutex::Autolock l(mLatestRequestMutex);
+ while (mLatestRequestId != requestId) {
+ nsecs_t startTime = systemTime();
+
+ auto res = mLatestRequestSignal.waitRelative(mLatestRequestMutex, timeout);
+ if (res != OK) return res;
+
+ timeout -= (systemTime() - startTime);
+ }
+
+ return OK;
+}
+
+void Camera2Client::notifyRequestId(int32_t requestId) {
+ Mutex::Autolock al(mLatestRequestMutex);
+
+ mLatestRequestId = requestId;
+ mLatestRequestSignal.signal();
+}
+
const char* Camera2Client::kAutofocusLabel = "autofocus";
const char* Camera2Client::kTakepictureLabel = "take_picture";