Enable frontend input loop when FrontendTune happens before Demux is

configured.

Test: atest VtsHalTvTunerV1_0TargetTest
Bug: 153366959
Change-Id: I6fa98e367a7530e308ea2a74e7efeb6ed4d3a56b

tv/tuner/1.0/default/Frontend.cpp

@@ -66,7 +66,7 @@ Return<Result> Frontend::tune(const FrontendSettings& /* settings */) {
 
     mTunerService->frontendStartTune(mId);
     mCallback->onEvent(FrontendEventType::LOCKED);
-    mIsLocked = false;
+    mIsLocked = true;
     return Result::SUCCESS;
 }
 
@@ -276,6 +276,10 @@ bool Frontend::supportsSatellite() {
     return mType == FrontendType::DVBS || mType == FrontendType::ISDBS ||
            mType == FrontendType::ISDBS3;
 }
+
+bool Frontend::isLocked() {
+    return mIsLocked;
+}
 }  // namespace implementation
 }  // namespace V1_0
 }  // namespace tuner

tv/tuner/1.0/default/Frontend.h

@@ -68,6 +68,8 @@ class Frontend : public IFrontend {
 
     string getSourceFile();
 
+    bool isLocked();
+
   private:
     virtual ~Frontend();
     bool supportsSatellite();

tv/tuner/1.0/default/Tuner.cpp

@@ -231,6 +231,9 @@ Return<void> Tuner::openLnbByName(const hidl_string& /*lnbName*/, openLnbByName_
 
 void Tuner::setFrontendAsDemuxSource(uint32_t frontendId, uint32_t demuxId) {
     mFrontendToDemux[frontendId] = demuxId;
+    if (mFrontends[frontendId] != nullptr && mFrontends[frontendId]->isLocked()) {
+        mDemuxes[demuxId]->startFrontendInputLoop();
+    }
 }
 
 void Tuner::frontendStopTune(uint32_t frontendId) {