diff --git a/tv/tuner/1.1/Android.bp b/tv/tuner/1.1/Android.bp
index c051ab0..476915e 100644
--- a/tv/tuner/1.1/Android.bp
+++ b/tv/tuner/1.1/Android.bp
@@ -6,6 +6,7 @@
     srcs: [
         "IFilter.hal",
         "ITuner.hal",
+        "IDemux.hal",
     ],
     interfaces: [
         "android.hidl.base@1.0",
diff --git a/tv/tuner/1.1/IDemux.hal b/tv/tuner/1.1/IDemux.hal
new file mode 100644
index 0000000..81cd001
--- /dev/null
+++ b/tv/tuner/1.1/IDemux.hal
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.tv.tuner@1.1;
+
+import @1.0::IDemux;
+import @1.0::Result;
+import @1.0::IFilter;
+
+/**
+ * Demultiplexer(Demux) takes a single multiplexed input and splits it into
+ * one or more output.
+ */
+interface IDemux extends @1.0::IDemux {
+    /**
+     * Get a 64-bit hardware sync ID for audio and video.
+     *
+     * It is used by the client to get the hardware sync ID for audio and video.
+     *
+     * @param filter the filter instance.
+     * @return result Result status of the operation.
+     *         SUCCESS if successful,
+     *         INVALID_ARGUMENT if failed for a wrong filter ID.
+     *         UNKNOWN_ERROR if failed for other reasons.
+     * @return avSyncHwId the id of hardware A/V sync.
+     */
+    getAvSyncHwId64Bit(IFilter filter) generates (Result result, uint64_t avSyncHwId);
+};
\ No newline at end of file
diff --git a/tv/tuner/1.1/default/Demux.cpp b/tv/tuner/1.1/default/Demux.cpp
index b6b029f..f501d74 100644
--- a/tv/tuner/1.1/default/Demux.cpp
+++ b/tv/tuner/1.1/default/Demux.cpp
@@ -34,6 +34,49 @@
 
 Demux::~Demux() {}
 
+Return<void> Demux::getAvSyncHwId64Bit(const sp<IFilter>& filter, getAvSyncHwId64Bit_cb _hidl_cb) {
+    ALOGV("%s", __FUNCTION__);
+
+    uint64_t avSyncHwId = -1;
+    uint64_t id;
+    Result status;
+
+    sp<V1_1::IFilter> filter_v1_1 = V1_1::IFilter::castFrom(filter);
+    if (filter_v1_1 != NULL) {
+        filter_v1_1->getId64Bit([&](Result result, uint64_t filterId) {
+            id = filterId;
+            status = result;
+        });
+    } else {
+        filter->getId([&](Result result, uint32_t filterId) {
+            id = filterId;
+            status = result;
+        });
+    }
+
+    if (status != Result::SUCCESS) {
+        ALOGE("[Demux] Can't get 64-bit filter Id.");
+        _hidl_cb(Result::INVALID_STATE, avSyncHwId);
+        return Void();
+    }
+
+    if (!mFilters[id]->isMediaFilter()) {
+        ALOGE("[Demux] Given filter is not a media filter.");
+        _hidl_cb(Result::INVALID_ARGUMENT, avSyncHwId);
+        return Void();
+    }
+
+    if (!mPcrFilterIds.empty()) {
+        // Return the lowest pcr filter id in the default implementation as the av sync id
+        _hidl_cb(Result::SUCCESS, *mPcrFilterIds.begin());
+        return Void();
+    }
+
+    ALOGE("[Demux] No PCR filter opened.");
+    _hidl_cb(Result::INVALID_STATE, avSyncHwId);
+    return Void();
+}
+
 Return<Result> Demux::setFrontendDataSource(uint32_t frontendId) {
     ALOGV("%s", __FUNCTION__);
 
@@ -170,6 +213,7 @@
     mRecordFilterIds.clear();
     mFilters.clear();
     mLastUsedFilterId = -1;
+    mTunerService->removeDemux(mDemuxId);
 
     return Result::SUCCESS;
 }
@@ -325,6 +369,12 @@
     std::lock_guard<std::mutex> lock(mFrontendInputThreadLock);
     mFrontendInputThreadRunning = true;
 
+    if (!mDvrPlayback) {
+        ALOGW("[Demux] No software Frontend input configured. Ending Frontend thread loop.");
+        mFrontendInputThreadRunning = false;
+        return;
+    }
+
     while (mFrontendInputThreadRunning) {
         uint32_t efState = 0;
         status_t status = mDvrPlayback->getDvrEventFlag()->wait(
diff --git a/tv/tuner/1.1/default/Demux.h b/tv/tuner/1.1/default/Demux.h
index 62f9162..f38f006 100644
--- a/tv/tuner/1.1/default/Demux.h
+++ b/tv/tuner/1.1/default/Demux.h
@@ -17,6 +17,7 @@
 #ifndef ANDROID_HARDWARE_TV_TUNER_V1_1_DEMUX_H_
 #define ANDROID_HARDWARE_TV_TUNER_V1_1_DEMUX_H_
 
+#include <android/hardware/tv/tuner/1.1/IDemux.h>
 #include <fmq/MessageQueue.h>
 #include <math.h>
 #include <set>
@@ -48,12 +49,15 @@
 class TimeFilter;
 class Tuner;
 
-class Demux : public IDemux {
+class Demux : public V1_1::IDemux {
   public:
     Demux(uint32_t demuxId, sp<Tuner> tuner);
 
     ~Demux();
 
+    virtual Return<void> getAvSyncHwId64Bit(const sp<IFilter>& filter,
+                                            getAvSyncHwId64Bit_cb _hidl_cb) override;
+
     virtual Return<Result> setFrontendDataSource(uint32_t frontendId) override;
 
     virtual Return<void> openFilter(const DemuxFilterType& type, uint32_t bufferSize,
diff --git a/tv/tuner/1.1/default/Frontend.cpp b/tv/tuner/1.1/default/Frontend.cpp
index 3475c36..6f5885f 100644
--- a/tv/tuner/1.1/default/Frontend.cpp
+++ b/tv/tuner/1.1/default/Frontend.cpp
@@ -42,6 +42,7 @@
     // Reset callback
     mCallback = nullptr;
     mIsLocked = false;
+    mTunerService->removeFrontend(mId);
 
     return Result::SUCCESS;
 }
diff --git a/tv/tuner/1.1/default/Tuner.cpp b/tv/tuner/1.1/default/Tuner.cpp
index c220ea2..0a0667e 100644
--- a/tv/tuner/1.1/default/Tuner.cpp
+++ b/tv/tuner/1.1/default/Tuner.cpp
@@ -34,7 +34,6 @@
     // Static Frontends array to maintain local frontends information
     // Array index matches their FrontendId in the default impl
     mFrontendSize = 8;
-    mFrontends.resize(mFrontendSize);
     mFrontends[0] = new Frontend(FrontendType::DVBT, 0, this);
     mFrontends[1] = new Frontend(FrontendType::ATSC, 1, this);
     mFrontends[2] = new Frontend(FrontendType::DVBC, 2, this);
@@ -45,7 +44,6 @@
     mFrontends[7] = new Frontend(FrontendType::ATSC, 7, this);
 
     FrontendInfo::FrontendCapabilities caps;
-    mFrontendCaps.resize(mFrontendSize);
     caps = FrontendInfo::FrontendCapabilities();
     caps.dvbtCaps(FrontendDvbtCapabilities());
     mFrontendCaps[0] = caps;
@@ -233,6 +231,22 @@
     }
 }
 
+void Tuner::removeDemux(uint32_t demuxId) {
+    map<uint32_t, uint32_t>::iterator it;
+    for (it = mFrontendToDemux.begin(); it != mFrontendToDemux.end();) {
+        if (it->second == demuxId) {
+            it = mFrontendToDemux.erase(it);
+        } else {
+            it++;
+        }
+    }
+    mDemuxes.erase(demuxId);
+}
+
+void Tuner::removeFrontend(uint32_t frontendId) {
+    mFrontendToDemux.erase(frontendId);
+}
+
 void Tuner::frontendStopTune(uint32_t frontendId) {
     map<uint32_t, uint32_t>::iterator it = mFrontendToDemux.find(frontendId);
     uint32_t demuxId;
diff --git a/tv/tuner/1.1/default/Tuner.h b/tv/tuner/1.1/default/Tuner.h
index 9463278..3b1574b 100644
--- a/tv/tuner/1.1/default/Tuner.h
+++ b/tv/tuner/1.1/default/Tuner.h
@@ -68,14 +68,16 @@
 
     void frontendStartTune(uint32_t frontendId);
     void frontendStopTune(uint32_t frontendId);
+    void removeDemux(uint32_t demuxId);
+    void removeFrontend(uint32_t frontendId);
 
   private:
     virtual ~Tuner();
     // Static mFrontends array to maintain local frontends information
-    vector<sp<Frontend>> mFrontends;
-    vector<FrontendInfo::FrontendCapabilities> mFrontendCaps;
-    std::map<uint32_t, uint32_t> mFrontendToDemux;
-    std::map<uint32_t, sp<Demux>> mDemuxes;
+    map<uint32_t, sp<Frontend>> mFrontends;
+    map<uint32_t, FrontendInfo::FrontendCapabilities> mFrontendCaps;
+    map<uint32_t, uint32_t> mFrontendToDemux;
+    map<uint32_t, sp<Demux>> mDemuxes;
     // To maintain how many Frontends we have
     int mFrontendSize;
     // The last used demux id. Initial value is -1.
diff --git a/tv/tuner/1.1/vts/functional/DemuxTests.cpp b/tv/tuner/1.1/vts/functional/DemuxTests.cpp
index b1d8a0a..e0600b6 100644
--- a/tv/tuner/1.1/vts/functional/DemuxTests.cpp
+++ b/tv/tuner/1.1/vts/functional/DemuxTests.cpp
@@ -38,4 +38,34 @@
     auto status = mDemux->close();
     mDemux = nullptr;
     return AssertionResult(status.isOk());
+}
+
+AssertionResult DemuxTests::getAvSyncId_64bit(sp<IFilter> filter, uint64_t& avSyncHwId) {
+    EXPECT_TRUE(mDemux) << "Demux is not opened yet.";
+    Result status;
+
+    sp<android::hardware::tv::tuner::V1_1::IDemux> demux_v1_1 =
+            android::hardware::tv::tuner::V1_1::IDemux::castFrom(mDemux);
+    if (demux_v1_1 != NULL) {
+        demux_v1_1->getAvSyncHwId64Bit(filter, [&](Result result, uint64_t id) {
+            status = result;
+            avSyncHwId = id;
+        });
+    } else {
+        ALOGW("[vts] Can't cast IDemux into v1_1.");
+        return failure();
+    }
+
+    return AssertionResult(status == Result::SUCCESS);
+}
+
+AssertionResult DemuxTests::getAvSyncTime(uint32_t avSyncId) {
+    EXPECT_TRUE(mDemux) << "Demux is not opened yet.";
+    Result status;
+    uint64_t syncTime;
+    mDemux->getAvSyncTime(avSyncId, [&](Result result, uint64_t time) {
+        status = result;
+        syncTime = time;
+    });
+    return AssertionResult(status == Result::SUCCESS);
 }
\ No newline at end of file
diff --git a/tv/tuner/1.1/vts/functional/DemuxTests.h b/tv/tuner/1.1/vts/functional/DemuxTests.h
index c28d6ca..393757c 100644
--- a/tv/tuner/1.1/vts/functional/DemuxTests.h
+++ b/tv/tuner/1.1/vts/functional/DemuxTests.h
@@ -17,6 +17,7 @@
 #include <android-base/logging.h>
 #include <android/hardware/tv/tuner/1.0/IDemux.h>
 #include <android/hardware/tv/tuner/1.0/types.h>
+#include <android/hardware/tv/tuner/1.1/IDemux.h>
 #include <android/hardware/tv/tuner/1.1/IFilter.h>
 #include <android/hardware/tv/tuner/1.1/ITuner.h>
 #include <binder/MemoryDealer.h>
@@ -44,6 +45,8 @@
 
     AssertionResult openDemux(sp<IDemux>& demux, uint32_t& demuxId);
     AssertionResult setDemuxFrontendDataSource(uint32_t frontendId);
+    AssertionResult getAvSyncId_64bit(sp<IFilter> filter, uint64_t& avSyncHwId);
+    AssertionResult getAvSyncTime(uint32_t avSyncId);
     AssertionResult closeDemux();
 
   protected:
diff --git a/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.cpp b/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.cpp
index 7c113d4..c74e29c 100644
--- a/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.cpp
+++ b/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.cpp
@@ -43,6 +43,41 @@
     ASSERT_TRUE(mFrontendTests.closeFrontend());
 }
 
+TEST_P(TunerDemuxHidlTest, getAvSyncTime) {
+    description("Get the A/V sync time from a PCR filter.");
+    uint32_t feId;
+    uint32_t demuxId;
+    sp<IDemux> demux;
+    uint64_t mediaFilterId;
+    uint64_t pcrFilterId;
+    uint64_t avSyncHwId;
+    sp<IFilter> mediaFilter;
+
+    mFrontendTests.getFrontendIdByType(frontendArray[DVBT].type, feId);
+    ASSERT_TRUE(feId != INVALID_ID);
+    ASSERT_TRUE(mFrontendTests.openFrontendById(feId));
+    ASSERT_TRUE(mFrontendTests.setFrontendCallback());
+    ASSERT_TRUE(mDemuxTests.openDemux(demux, demuxId));
+    ASSERT_TRUE(mDemuxTests.setDemuxFrontendDataSource(feId));
+    mFilterTests.setDemux(demux);
+    ASSERT_TRUE(mFilterTests.openFilterInDemux(filterArray[TS_VIDEO1].type,
+                                               filterArray[TS_VIDEO1].bufferSize));
+    ASSERT_TRUE(mFilterTests.getNewlyOpenedFilterId_64bit(mediaFilterId));
+    ASSERT_TRUE(mFilterTests.configFilter(filterArray[TS_VIDEO1].settings, mediaFilterId));
+    mediaFilter = mFilterTests.getFilterById(mediaFilterId);
+    ASSERT_TRUE(mFilterTests.openFilterInDemux(filterArray[TS_PCR0].type,
+                                               filterArray[TS_PCR0].bufferSize));
+    ASSERT_TRUE(mFilterTests.getNewlyOpenedFilterId_64bit(pcrFilterId));
+    ASSERT_TRUE(mFilterTests.configFilter(filterArray[TS_PCR0].settings, pcrFilterId));
+    ASSERT_TRUE(mDemuxTests.getAvSyncId_64bit(mediaFilter, avSyncHwId));
+    ASSERT_TRUE(pcrFilterId == avSyncHwId);
+    ASSERT_TRUE(mDemuxTests.getAvSyncTime(pcrFilterId));
+    ASSERT_TRUE(mFilterTests.closeFilter(pcrFilterId));
+    ASSERT_TRUE(mFilterTests.closeFilter(mediaFilterId));
+    ASSERT_TRUE(mDemuxTests.closeDemux());
+    ASSERT_TRUE(mFrontendTests.closeFrontend());
+}
+
 TEST_P(TunerFilterHidlTest, StartFilterInDemux) {
     description("Open and start a filter in Demux.");
     // TODO use parameterized tests
@@ -54,5 +89,11 @@
         testing::ValuesIn(android::hardware::getAllHalInstanceNames(ITuner::descriptor)),
         android::hardware::PrintInstanceNameToString);
 
+INSTANTIATE_TEST_SUITE_P(
+        PerInstance, TunerDemuxHidlTest,
+        testing::ValuesIn(android::hardware::getAllHalInstanceNames(ITuner::descriptor)),
+        android::hardware::PrintInstanceNameToString);
+
 GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(TunerFilterHidlTest);
+GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(TunerDemuxHidlTest);
 }  // namespace
diff --git a/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.h b/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.h
index 0453634..30533b1 100644
--- a/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.h
+++ b/tv/tuner/1.1/vts/functional/VtsHalTvTunerV1_1TargetTest.h
@@ -49,4 +49,27 @@
     DemuxTests mDemuxTests;
     FilterTests mFilterTests;
 };
+
+class TunerDemuxHidlTest : public testing::TestWithParam<std::string> {
+  public:
+    virtual void SetUp() override {
+        mService = ITuner::getService(GetParam());
+        ASSERT_NE(mService, nullptr);
+        initConfiguration();
+
+        mFrontendTests.setService(mService);
+        mDemuxTests.setService(mService);
+        mFilterTests.setService(mService);
+    }
+
+  protected:
+    static void description(const std::string& description) {
+        RecordProperty("description", description);
+    }
+
+    sp<ITuner> mService;
+    FrontendTests mFrontendTests;
+    DemuxTests mDemuxTests;
+    FilterTests mFilterTests;
+};
 }  // namespace
\ No newline at end of file