Merge "Release AudioTrackCallback when the track is removed."
diff --git a/apex/TEST_MAPPING b/apex/TEST_MAPPING
index f036516..09c46d6 100644
--- a/apex/TEST_MAPPING
+++ b/apex/TEST_MAPPING
@@ -14,17 +14,9 @@
         },
         {
           "include-filter": "com.google.android.media.gts.WidevineGenericOpsTests"
-        }
-      ]
-    },
-    {
-      "name": "GtsExoPlayerTestCases",
-      "options" : [
-        {
-          "include-annotation": "android.platform.test.annotations.SocPresubmit"
         },
         {
-          "include-filter": "com.google.android.exoplayer.gts.DashTest#testWidevine23FpsH264Fixed"
+          "include-filter": "com.google.android.media.gts.WidevineYouTubePerformanceTests"
         }
       ]
     }
diff --git a/drm/TEST_MAPPING b/drm/TEST_MAPPING
index 2595e3e..9f6a532 100644
--- a/drm/TEST_MAPPING
+++ b/drm/TEST_MAPPING
@@ -9,17 +9,9 @@
         },
         {
           "include-filter": "com.google.android.media.gts.WidevineGenericOpsTests"
-        }
-      ]
-    },
-    {
-      "name": "GtsExoPlayerTestCases",
-      "options" : [
-        {
-          "include-annotation": "android.platform.test.annotations.SocPresubmit"
         },
         {
-          "include-filter": "com.google.android.exoplayer.gts.DashTest#testWidevine23FpsH264Fixed"
+          "include-filter": "com.google.android.media.gts.WidevineYouTubePerformanceTests"
         }
       ]
     }
diff --git a/drm/drmserver/DrmManager.cpp b/drm/drmserver/DrmManager.cpp
index 9a32cc5..74e3223 100644
--- a/drm/drmserver/DrmManager.cpp
+++ b/drm/drmserver/DrmManager.cpp
@@ -99,13 +99,13 @@
         }
         default:
         {
-            ALOGW("Unrecognized message type: %zd", msg->what());
+            ALOGW("Unrecognized message type: %u", msg->what());
         }
     }
 }
 
 int64_t DrmManager::getMetricsFlushPeriodUs() {
-    return 1000 * 1000 * std::max(1ll, property_get_int64("drmmanager.metrics.period", 86400));
+    return 1000 * 1000 * std::max(1ll, (long long)property_get_int64("drmmanager.metrics.period", 86400));
 }
 
 void DrmManager::recordEngineMetrics(
diff --git a/include/drm/TEST_MAPPING b/include/drm/TEST_MAPPING
index 28e432e..512e844 100644
--- a/include/drm/TEST_MAPPING
+++ b/include/drm/TEST_MAPPING
@@ -8,17 +8,9 @@
         },
         {
           "include-filter": "com.google.android.media.gts.WidevineGenericOpsTests"
-        }
-      ]
-    },
-    {
-      "name": "GtsExoPlayerTestCases",
-      "options" : [
-        {
-          "include-annotation": "android.platform.test.annotations.SocPresubmit"
         },
         {
-          "include-filter": "com.google.android.exoplayer.gts.DashTest#testWidevine23FpsH264Fixed"
+          "include-filter": "com.google.android.media.gts.WidevineYouTubePerformanceTests"
         }
       ]
     }
diff --git a/media/TEST_MAPPING b/media/TEST_MAPPING
index b006f38..50facfb 100644
--- a/media/TEST_MAPPING
+++ b/media/TEST_MAPPING
@@ -26,17 +26,9 @@
                 },
                 {
                     "include-filter": "com.google.android.media.gts.WidevineGenericOpsTests"
-                }
-            ]
-        },
-        {
-            "name": "GtsExoPlayerTestCases",
-            "options" : [
-                {
-                    "include-annotation": "android.platform.test.annotations.SocPresubmit"
                 },
                 {
-                    "include-filter": "com.google.android.exoplayer.gts.DashTest#testWidevine23FpsH264Fixed"
+                    "include-filter": "com.google.android.media.gts.WidevineYouTubePerformanceTests"
                 }
             ]
         }
diff --git a/media/codec2/sfplugin/CCodecBuffers.cpp b/media/codec2/sfplugin/CCodecBuffers.cpp
index c49a16c..3c99bf6 100644
--- a/media/codec2/sfplugin/CCodecBuffers.cpp
+++ b/media/codec2/sfplugin/CCodecBuffers.cpp
@@ -91,7 +91,9 @@
             newFormat->setInt32(KEY_STRIDE, stride);
             ALOGD("[%s] updating stride = %d", mName, stride);
             if (img->mNumPlanes > 1 && stride > 0) {
-                int32_t vstride = (img->mPlane[1].mOffset - img->mPlane[0].mOffset) / stride;
+                int64_t offsetDelta =
+                    (int64_t)img->mPlane[1].mOffset - (int64_t)img->mPlane[0].mOffset;
+                int32_t vstride = int32_t(offsetDelta / stride);
                 newFormat->setInt32(KEY_SLICE_HEIGHT, vstride);
                 ALOGD("[%s] updating vstride = %d", mName, vstride);
             }
diff --git a/media/libmedia/MediaResource.cpp b/media/libmedia/MediaResource.cpp
index fe86d27..ec52a49 100644
--- a/media/libmedia/MediaResource.cpp
+++ b/media/libmedia/MediaResource.cpp
@@ -43,11 +43,11 @@
 }
 
 //static
-MediaResource MediaResource::CodecResource(bool secure, bool video) {
+MediaResource MediaResource::CodecResource(bool secure, bool video, int64_t instanceCount) {
     return MediaResource(
             secure ? Type::kSecureCodec : Type::kNonSecureCodec,
             video ? SubType::kVideoCodec : SubType::kAudioCodec,
-            1);
+            instanceCount);
 }
 
 //static
diff --git a/media/libmedia/include/media/MediaResource.h b/media/libmedia/include/media/MediaResource.h
index 4927d28..4712528 100644
--- a/media/libmedia/include/media/MediaResource.h
+++ b/media/libmedia/include/media/MediaResource.h
@@ -37,7 +37,7 @@
     MediaResource(Type type, SubType subType, int64_t value);
     MediaResource(Type type, const std::vector<uint8_t> &id, int64_t value);
 
-    static MediaResource CodecResource(bool secure, bool video);
+    static MediaResource CodecResource(bool secure, bool video, int64_t instanceCount = 1);
     static MediaResource GraphicMemoryResource(int64_t value);
     static MediaResource CpuBoostResource();
     static MediaResource VideoBatteryResource();
diff --git a/media/libmediatranscoding/transcoder/MediaTranscoder.cpp b/media/libmediatranscoding/transcoder/MediaTranscoder.cpp
index fbed5c2..4730be3 100644
--- a/media/libmediatranscoding/transcoder/MediaTranscoder.cpp
+++ b/media/libmediatranscoding/transcoder/MediaTranscoder.cpp
@@ -282,7 +282,7 @@
         format = std::shared_ptr<AMediaFormat>(mergedFormat, &AMediaFormat_delete);
     }
 
-    transcoder->configure(mSampleReader, trackIndex, format);
+    status = transcoder->configure(mSampleReader, trackIndex, format);
     if (status != AMEDIA_OK) {
         LOG(ERROR) << "Configure track transcoder for track #" << trackIndex << " returned error "
                    << status;
diff --git a/media/libstagefright/ACodec.cpp b/media/libstagefright/ACodec.cpp
index 382491e..d2f347c 100644
--- a/media/libstagefright/ACodec.cpp
+++ b/media/libstagefright/ACodec.cpp
@@ -2238,6 +2238,12 @@
             }
             err = setupG711Codec(encoder, sampleRate, numChannels);
         }
+    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_OPUS)) {
+        int32_t numChannels = 1, sampleRate = 48000;
+        if (msg->findInt32("channel-count", &numChannels) &&
+            msg->findInt32("sample-rate", &sampleRate)) {
+            err = setupOpusCodec(encoder, sampleRate, numChannels);
+        }
     } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_FLAC)) {
         // numChannels needs to be set to properly communicate PCM values.
         int32_t numChannels = 2, sampleRate = 44100, compressionLevel = -1;
@@ -3117,6 +3123,26 @@
             kPortIndexInput, sampleRate, numChannels);
 }
 
+status_t ACodec::setupOpusCodec(bool encoder, int32_t sampleRate, int32_t numChannels) {
+    if (encoder) {
+        return INVALID_OPERATION;
+    }
+    OMX_AUDIO_PARAM_ANDROID_OPUSTYPE def;
+    InitOMXParams(&def);
+    def.nPortIndex = kPortIndexInput;
+    status_t err = mOMXNode->getParameter(
+            (OMX_INDEXTYPE)OMX_IndexParamAudioAndroidOpus, &def, sizeof(def));
+    if (err != OK) {
+        ALOGE("setupOpusCodec(): Error %d getting OMX_IndexParamAudioAndroidOpus parameter", err);
+        return err;
+    }
+    def.nSampleRate = sampleRate;
+    def.nChannels = numChannels;
+    err = mOMXNode->setParameter(
+           (OMX_INDEXTYPE)OMX_IndexParamAudioAndroidOpus, &def, sizeof(def));
+    return err;
+}
+
 status_t ACodec::setupFlacCodec(
         bool encoder, int32_t numChannels, int32_t sampleRate, int32_t compressionLevel,
         AudioEncoding encoding) {
diff --git a/media/libstagefright/codecs/opus/dec/SoftOpus.cpp b/media/libstagefright/codecs/opus/dec/SoftOpus.cpp
index 4f61aa8..5bb1879 100644
--- a/media/libstagefright/codecs/opus/dec/SoftOpus.cpp
+++ b/media/libstagefright/codecs/opus/dec/SoftOpus.cpp
@@ -58,6 +58,8 @@
       mInputBufferCount(0),
       mDecoder(NULL),
       mHeader(NULL),
+      mNumChannels(1),
+      mSamplingRate(kRate),
       mCodecDelay(0),
       mSeekPreRoll(0),
       mAnchorTimeUs(0),
@@ -169,11 +171,11 @@
             }
 
             opusParams->nAudioBandWidth = 0;
-            opusParams->nSampleRate = kRate;
+            opusParams->nSampleRate = mSamplingRate;
             opusParams->nBitRate = 0;
 
             if (!isConfigured()) {
-                opusParams->nChannels = 1;
+                opusParams->nChannels = mNumChannels;
             } else {
                 opusParams->nChannels = mHeader->channels;
             }
@@ -274,7 +276,8 @@
             if (opusParams->nPortIndex != 0) {
                 return OMX_ErrorUndefined;
             }
-
+            mNumChannels = opusParams->nChannels;
+            mSamplingRate = opusParams->nSampleRate;
             return OMX_ErrorNone;
         }
 
@@ -496,6 +499,8 @@
                                    *(reinterpret_cast<int64_t*>(inHeader->pBuffer +
                                                                 inHeader->nOffset)),
                                    kRate);
+                mSamplingRate = kRate;
+                mNumChannels = mHeader->channels;
                 notify(OMX_EventPortSettingsChanged, 1, 0, NULL);
                 mOutputPortSettingsChange = AWAITING_DISABLED;
             }
diff --git a/media/libstagefright/codecs/opus/dec/SoftOpus.h b/media/libstagefright/codecs/opus/dec/SoftOpus.h
index 91cafa1..00058c8 100644
--- a/media/libstagefright/codecs/opus/dec/SoftOpus.h
+++ b/media/libstagefright/codecs/opus/dec/SoftOpus.h
@@ -70,6 +70,8 @@
     OpusMSDecoder *mDecoder;
     OpusHeader *mHeader;
 
+    int32_t mNumChannels;
+    int32_t mSamplingRate;
     int64_t mCodecDelay;
     int64_t mSeekPreRoll;
     int64_t mSamplesToDiscard;
diff --git a/media/libstagefright/include/media/stagefright/ACodec.h b/media/libstagefright/include/media/stagefright/ACodec.h
index cc40f76..797ba31 100644
--- a/media/libstagefright/include/media/stagefright/ACodec.h
+++ b/media/libstagefright/include/media/stagefright/ACodec.h
@@ -500,6 +500,7 @@
     status_t setupAMRCodec(bool encoder, bool isWAMR, int32_t bitRate);
     status_t setupG711Codec(bool encoder, int32_t sampleRate, int32_t numChannels);
 
+    status_t setupOpusCodec(bool encoder, int32_t sampleRate, int32_t numChannels);
     status_t setupFlacCodec(
             bool encoder, int32_t numChannels, int32_t sampleRate, int32_t compressionLevel,
             AudioEncoding encoding);
diff --git a/services/audiopolicy/config/audio_policy_configuration.xml b/services/audiopolicy/config/audio_policy_configuration.xml
index b28381b..dcdc035 100644
--- a/services/audiopolicy/config/audio_policy_configuration.xml
+++ b/services/audiopolicy/config/audio_policy_configuration.xml
@@ -91,7 +91,7 @@
                 <!-- Output devices declaration, i.e. Sink DEVICE PORT -->
                 <devicePort tagName="Earpiece" type="AUDIO_DEVICE_OUT_EARPIECE" role="sink">
                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
-                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_IN_MONO"/>
+                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_MONO"/>
                 </devicePort>
                 <devicePort tagName="Speaker" role="sink" type="AUDIO_DEVICE_OUT_SPEAKER" address="">
                     <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
diff --git a/services/audiopolicy/config/audio_policy_configuration_7_0.xml b/services/audiopolicy/config/audio_policy_configuration_7_0.xml
index 6087bf2..a9ecff3 100644
--- a/services/audiopolicy/config/audio_policy_configuration_7_0.xml
+++ b/services/audiopolicy/config/audio_policy_configuration_7_0.xml
@@ -91,7 +91,7 @@
                 <!-- Output devices declaration, i.e. Sink DEVICE PORT -->
                 <devicePort tagName="Earpiece" type="AUDIO_DEVICE_OUT_EARPIECE" role="sink">
                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
-                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_IN_MONO"/>
+                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_MONO"/>
                 </devicePort>
                 <devicePort tagName="Speaker" role="sink" type="AUDIO_DEVICE_OUT_SPEAKER" address="">
                     <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
diff --git a/services/mediaresourcemanager/Android.bp b/services/mediaresourcemanager/Android.bp
index 346ee52..96f2108 100644
--- a/services/mediaresourcemanager/Android.bp
+++ b/services/mediaresourcemanager/Android.bp
@@ -11,6 +11,19 @@
     path: "aidl",
 }
 
+filegroup {
+    name: "resourceobserver_aidl",
+    srcs: [
+        "aidl/android/media/IResourceObserver.aidl",
+        "aidl/android/media/IResourceObserverService.aidl",
+        "aidl/android/media/MediaObservableEvent.aidl",
+        "aidl/android/media/MediaObservableFilter.aidl",
+        "aidl/android/media/MediaObservableType.aidl",
+        "aidl/android/media/MediaObservableParcel.aidl",
+    ],
+    path: "aidl",
+}
+
 aidl_interface {
     name: "resourcemanager_aidl_interface",
     unstable: true,
@@ -20,11 +33,21 @@
     ],
 }
 
+aidl_interface {
+    name: "resourceobserver_aidl_interface",
+    unstable: true,
+    local_include_dir: "aidl",
+    srcs: [
+        ":resourceobserver_aidl",
+    ],
+}
+
 cc_library {
     name: "libresourcemanagerservice",
 
     srcs: [
         "ResourceManagerService.cpp",
+        "ResourceObserverService.cpp",
         "ServiceLog.cpp",
     ],
 
@@ -35,6 +58,7 @@
         "libbinder_ndk",
         "libutils",
         "liblog",
+        "resourceobserver_aidl_interface-ndk_platform",
     ],
 
     include_dirs: ["frameworks/av/include"],
diff --git a/services/mediaresourcemanager/ResourceManagerService.cpp b/services/mediaresourcemanager/ResourceManagerService.cpp
index 3d36f8e..7ee52c5 100644
--- a/services/mediaresourcemanager/ResourceManagerService.cpp
+++ b/services/mediaresourcemanager/ResourceManagerService.cpp
@@ -36,6 +36,7 @@
 #include <unistd.h>
 
 #include "ResourceManagerService.h"
+#include "ResourceObserverService.h"
 #include "ServiceLog.h"
 
 namespace android {
@@ -267,6 +268,13 @@
     if (status != STATUS_OK) {
         return;
     }
+
+    std::shared_ptr<ResourceObserverService> observerService =
+            ResourceObserverService::instantiate();
+
+    if (observerService != nullptr) {
+        service->setObserverService(observerService);
+    }
     // TODO: mediaserver main() is already starting the thread pool,
     // move this to mediaserver main() when other services in mediaserver
     // are converted to ndk-platform aidl.
@@ -275,6 +283,11 @@
 
 ResourceManagerService::~ResourceManagerService() {}
 
+void ResourceManagerService::setObserverService(
+        const std::shared_ptr<ResourceObserverService>& observerService) {
+    mObserverService = observerService;
+}
+
 Status ResourceManagerService::config(const std::vector<MediaResourcePolicyParcel>& policies) {
     String8 log = String8::format("config(%s)", getString(policies).string());
     mServiceLog->add(log);
@@ -358,6 +371,7 @@
     }
     ResourceInfos& infos = getResourceInfosForEdit(pid, mMap);
     ResourceInfo& info = getResourceInfoForEdit(uid, clientId, client, infos);
+    ResourceList resourceAdded;
 
     for (size_t i = 0; i < resources.size(); ++i) {
         const auto &res = resources[i];
@@ -379,12 +393,22 @@
         } else {
             mergeResources(info.resources[resType], res);
         }
+        // Add it to the list of added resources for observers.
+        auto it = resourceAdded.find(resType);
+        if (it == resourceAdded.end()) {
+            resourceAdded[resType] = res;
+        } else {
+            mergeResources(it->second, res);
+        }
     }
     if (info.deathNotifier == nullptr && client != nullptr) {
         info.deathNotifier = new DeathNotifier(ref<ResourceManagerService>(), pid, clientId);
         AIBinder_linkToDeath(client->asBinder().get(),
                 mDeathRecipient.get(), info.deathNotifier.get());
     }
+    if (mObserverService != nullptr && !resourceAdded.empty()) {
+        mObserverService->onResourceAdded(uid, pid, resourceAdded);
+    }
     notifyResourceGranted(pid, resources);
     return Status::ok();
 }
@@ -415,7 +439,7 @@
     }
 
     ResourceInfo &info = infos.editValueAt(index);
-
+    ResourceList resourceRemoved;
     for (size_t i = 0; i < resources.size(); ++i) {
         const auto &res = resources[i];
         const auto resType = std::tuple(res.type, res.subType, res.id);
@@ -427,14 +451,27 @@
         // ignore if we don't have it
         if (info.resources.find(resType) != info.resources.end()) {
             MediaResourceParcel &resource = info.resources[resType];
+            MediaResourceParcel actualRemoved = res;
             if (resource.value > res.value) {
                 resource.value -= res.value;
             } else {
                 onLastRemoved(res, info);
                 info.resources.erase(resType);
+                actualRemoved.value = resource.value;
+            }
+
+            // Add it to the list of removed resources for observers.
+            auto it = resourceRemoved.find(resType);
+            if (it == resourceRemoved.end()) {
+                resourceRemoved[resType] = actualRemoved;
+            } else {
+                mergeResources(it->second, actualRemoved);
             }
         }
     }
+    if (mObserverService != nullptr && !resourceRemoved.empty()) {
+        mObserverService->onResourceRemoved(info.uid, pid, resourceRemoved);
+    }
     return Status::ok();
 }
 
@@ -475,6 +512,10 @@
     AIBinder_unlinkToDeath(info.client->asBinder().get(),
             mDeathRecipient.get(), info.deathNotifier.get());
 
+    if (mObserverService != nullptr && !info.resources.empty()) {
+        mObserverService->onResourceRemoved(info.uid, pid, info.resources);
+    }
+
     infos.removeItemsAt(index);
     return Status::ok();
 }
diff --git a/services/mediaresourcemanager/ResourceManagerService.h b/services/mediaresourcemanager/ResourceManagerService.h
index 49c247e..2b3dab3 100644
--- a/services/mediaresourcemanager/ResourceManagerService.h
+++ b/services/mediaresourcemanager/ResourceManagerService.h
@@ -33,6 +33,7 @@
 
 class DeathNotifier;
 class ResourceManagerService;
+class ResourceObserverService;
 class ServiceLog;
 struct ProcessInfoInterface;
 
@@ -95,6 +96,8 @@
             const sp<ProcessInfoInterface> &processInfo,
             const sp<SystemCallbackInterface> &systemResource);
     virtual ~ResourceManagerService();
+    void setObserverService(
+            const std::shared_ptr<ResourceObserverService>& observerService);
 
     // IResourceManagerService interface
     Status config(const std::vector<MediaResourcePolicyParcel>& policies) override;
@@ -180,6 +183,7 @@
     int32_t mCpuBoostCount;
     ::ndk::ScopedAIBinder_DeathRecipient mDeathRecipient;
     std::map<int, int> mOverridePidMap;
+    std::shared_ptr<ResourceObserverService> mObserverService;
 };
 
 // ----------------------------------------------------------------------------
diff --git a/services/mediaresourcemanager/ResourceObserverService.cpp b/services/mediaresourcemanager/ResourceObserverService.cpp
new file mode 100644
index 0000000..7c4c875
--- /dev/null
+++ b/services/mediaresourcemanager/ResourceObserverService.cpp
@@ -0,0 +1,312 @@
+/**
+ *
+ * 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.
+ */
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "ResourceObserverService"
+#include <utils/Log.h>
+
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+#include <binder/IServiceManager.h>
+#include <utils/String16.h>
+#include <aidl/android/media/MediaResourceParcel.h>
+
+#include "ResourceObserverService.h"
+
+namespace aidl {
+namespace android {
+namespace media {
+bool operator<(const MediaObservableFilter& lhs, const MediaObservableFilter &rhs) {
+    return lhs.type < rhs.type || (lhs.type == rhs.type && lhs.eventFilter < rhs.eventFilter);
+}
+}}} // namespace ::aidl::android::media
+
+namespace android {
+
+using ::aidl::android::media::MediaResourceParcel;
+using ::aidl::android::media::MediaObservableEvent;
+
+// MediaObservableEvent will be used as uint64_t flags.
+static_assert(sizeof(MediaObservableEvent) == sizeof(uint64_t));
+
+static std::vector<MediaObservableEvent> sEvents = {
+        MediaObservableEvent::kBusy,
+        MediaObservableEvent::kIdle,
+};
+
+static MediaObservableType getObservableType(const MediaResourceParcel& res) {
+    if (res.subType == MediaResourceSubType::kVideoCodec) {
+        if (res.type == MediaResourceType::kNonSecureCodec) {
+            return MediaObservableType::kVideoNonSecureCodec;
+        }
+        if (res.type == MediaResourceType::kSecureCodec) {
+            return MediaObservableType::kVideoSecureCodec;
+        }
+    }
+    return MediaObservableType::kInvalid;
+}
+
+//static
+std::mutex ResourceObserverService::sDeathRecipientLock;
+//static
+std::map<uintptr_t, std::shared_ptr<ResourceObserverService::DeathRecipient> >
+ResourceObserverService::sDeathRecipientMap;
+
+struct ResourceObserverService::DeathRecipient {
+    DeathRecipient(ResourceObserverService* _service,
+            const std::shared_ptr<IResourceObserver>& _observer)
+        : service(_service), observer(_observer) {}
+    ~DeathRecipient() {}
+
+    void binderDied() {
+        if (service != nullptr) {
+            service->unregisterObserver(observer);
+        }
+    }
+
+    ResourceObserverService* service;
+    std::shared_ptr<IResourceObserver> observer;
+};
+
+// static
+void ResourceObserverService::BinderDiedCallback(void* cookie) {
+    uintptr_t id = reinterpret_cast<uintptr_t>(cookie);
+
+    ALOGW("Observer %lld is dead", (long long)id);
+
+    std::shared_ptr<DeathRecipient> recipient;
+
+    {
+        std::scoped_lock lock{sDeathRecipientLock};
+
+        auto it = sDeathRecipientMap.find(id);
+        if (it != sDeathRecipientMap.end()) {
+            recipient = it->second;
+        }
+    }
+
+    if (recipient != nullptr) {
+        recipient->binderDied();
+    }
+}
+
+//static
+std::shared_ptr<ResourceObserverService> ResourceObserverService::instantiate() {
+    std::shared_ptr<ResourceObserverService> observerService =
+            ::ndk::SharedRefBase::make<ResourceObserverService>();
+    binder_status_t status = AServiceManager_addService(observerService->asBinder().get(),
+            ResourceObserverService::getServiceName());
+    if (status != STATUS_OK) {
+        return nullptr;
+    }
+    return observerService;
+}
+
+ResourceObserverService::ResourceObserverService()
+    : mDeathRecipient(AIBinder_DeathRecipient_new(BinderDiedCallback)) {}
+
+binder_status_t ResourceObserverService::dump(
+        int fd, const char** /*args*/, uint32_t /*numArgs*/) {
+    String8 result;
+
+    if (checkCallingPermission(String16("android.permission.DUMP")) == false) {
+        result.format("Permission Denial: "
+                "can't dump ResourceManagerService from pid=%d, uid=%d\n",
+                AIBinder_getCallingPid(),
+                AIBinder_getCallingUid());
+        write(fd, result.string(), result.size());
+        return PERMISSION_DENIED;
+    }
+
+    result.appendFormat("ResourceObserverService: %p\n", this);
+    result.appendFormat("  Registered Observers: %zu\n", mObserverInfoMap.size());
+
+    {
+        std::scoped_lock lock{mObserverLock};
+
+        for (auto &observer : mObserverInfoMap) {
+            result.appendFormat("    Observer %p:\n", observer.second.binder.get());
+            for (auto &observable : observer.second.filters) {
+                String8 enabledEventsStr;
+                for (auto &event : sEvents) {
+                    if (((uint64_t)observable.eventFilter & (uint64_t)event) != 0) {
+                        if (!enabledEventsStr.isEmpty()) {
+                            enabledEventsStr.append("|");
+                        }
+                        enabledEventsStr.append(toString(event).c_str());
+                    }
+                }
+                result.appendFormat("      %s: %s\n",
+                        toString(observable.type).c_str(), enabledEventsStr.c_str());
+            }
+        }
+    }
+
+    write(fd, result.string(), result.size());
+    return OK;
+}
+
+Status ResourceObserverService::registerObserver(
+        const std::shared_ptr<IResourceObserver>& in_observer,
+        const std::vector<MediaObservableFilter>& in_filters) {
+    // TODO(chz): Guard this by a permission.
+
+    ::ndk::SpAIBinder binder = in_observer->asBinder();
+
+    {
+        std::scoped_lock lock{mObserverLock};
+
+        if (mObserverInfoMap.find((uintptr_t)binder.get()) != mObserverInfoMap.end()) {
+            return Status::fromServiceSpecificError(ALREADY_EXISTS);
+        }
+
+        if (in_filters.empty()) {
+            return Status::fromServiceSpecificError(BAD_VALUE);
+        }
+
+        // Add observer info.
+        mObserverInfoMap.emplace((uintptr_t)binder.get(),
+                ObserverInfo{binder, in_observer, in_filters});
+
+        // Add observer to observable->subscribers map.
+        for (auto &filter : in_filters) {
+            for (auto &event : sEvents) {
+                if (!((uint64_t)filter.eventFilter & (uint64_t)event)) {
+                    continue;
+                }
+                MediaObservableFilter key{filter.type, event};
+                mObservableToSubscribersMap[key].emplace((uintptr_t)binder.get(), in_observer);
+            }
+        }
+    }
+
+    // Add death binder and link.
+    uintptr_t cookie = (uintptr_t)binder.get();
+    {
+        std::scoped_lock lock{sDeathRecipientLock};
+        sDeathRecipientMap.emplace(
+                cookie, std::make_shared<DeathRecipient>(this, in_observer));
+    }
+
+    AIBinder_linkToDeath(binder.get(), mDeathRecipient.get(),
+                         reinterpret_cast<void*>(cookie));
+
+    return Status::ok();
+}
+
+Status ResourceObserverService::unregisterObserver(
+        const std::shared_ptr<IResourceObserver>& in_observer) {
+    // TODO(chz): Guard this by a permission.
+
+    ::ndk::SpAIBinder binder = in_observer->asBinder();
+
+    {
+        std::scoped_lock lock{mObserverLock};
+
+        auto it = mObserverInfoMap.find((uintptr_t)binder.get());
+        if (it == mObserverInfoMap.end()) {
+            return Status::fromServiceSpecificError(NAME_NOT_FOUND);
+        }
+
+        // Remove observer from observable->subscribers map.
+        for (auto &filter : it->second.filters) {
+            for (auto &event : sEvents) {
+                if (!((uint64_t)filter.eventFilter & (uint64_t)event)) {
+                    continue;
+                }
+                MediaObservableFilter key{filter.type, event};
+                mObservableToSubscribersMap[key].erase((uintptr_t)binder.get());
+
+                //Remove the entry if there's no more subscribers.
+                if (mObservableToSubscribersMap[key].empty()) {
+                    mObservableToSubscribersMap.erase(key);
+                }
+            }
+        }
+
+        // Remove observer info.
+        mObserverInfoMap.erase(it);
+    }
+
+    // Unlink and remove death binder.
+    uintptr_t cookie = (uintptr_t)binder.get();
+    AIBinder_unlinkToDeath(binder.get(), mDeathRecipient.get(),
+            reinterpret_cast<void*>(cookie));
+
+    {
+        std::scoped_lock lock{sDeathRecipientLock};
+        sDeathRecipientMap.erase(cookie);
+    }
+
+    return Status::ok();
+}
+
+void ResourceObserverService::notifyObservers(
+        MediaObservableEvent event, int uid, int pid, const ResourceList &resources) {
+    struct CalleeInfo {
+        std::shared_ptr<IResourceObserver> observer;
+        std::vector<MediaObservableParcel> monitors;
+    };
+    // Build a consolidated list of observers to call with their respective observables.
+    std::map<uintptr_t, CalleeInfo> calleeList;
+
+    {
+        std::scoped_lock lock{mObserverLock};
+
+        for (auto &res : resources) {
+            // Skip if this resource doesn't map to any observable type.
+            MediaObservableType observableType = getObservableType(res.second);
+            if (observableType == MediaObservableType::kInvalid) {
+                continue;
+            }
+            MediaObservableFilter key{observableType, event};
+            // Skip if no one subscribed to this observable.
+            auto observableIt = mObservableToSubscribersMap.find(key);
+            if (observableIt == mObservableToSubscribersMap.end()) {
+                continue;
+            }
+            // Loop through all subsribers.
+            for (auto &subscriber : observableIt->second) {
+                auto calleeIt = calleeList.find(subscriber.first);
+                if (calleeIt == calleeList.end()) {
+                    calleeList.emplace(subscriber.first, CalleeInfo{
+                        subscriber.second, {{observableType, res.second.value}}});
+                } else {
+                    calleeIt->second.monitors.push_back({observableType, res.second.value});
+                }
+            }
+        }
+    }
+
+    // Finally call the observers about the status change.
+    for (auto &calleeInfo : calleeList) {
+        calleeInfo.second.observer->onStatusChanged(
+                event, uid, pid, calleeInfo.second.monitors);
+    }
+}
+
+void ResourceObserverService::onResourceAdded(
+        int uid, int pid, const ResourceList &resources) {
+    notifyObservers(MediaObservableEvent::kBusy, uid, pid, resources);
+}
+
+void ResourceObserverService::onResourceRemoved(
+        int uid, int pid, const ResourceList &resources) {
+    notifyObservers(MediaObservableEvent::kIdle, uid, pid, resources);
+}
+
+} // namespace android
diff --git a/services/mediaresourcemanager/ResourceObserverService.h b/services/mediaresourcemanager/ResourceObserverService.h
new file mode 100644
index 0000000..46bc5fb
--- /dev/null
+++ b/services/mediaresourcemanager/ResourceObserverService.h
@@ -0,0 +1,95 @@
+/**
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_MEDIA_RESOURCE_OBSERVER_SERVICE_H
+#define ANDROID_MEDIA_RESOURCE_OBSERVER_SERVICE_H
+
+#include <map>
+
+#include <aidl/android/media/BnResourceObserverService.h>
+#include "ResourceManagerService.h"
+
+namespace android {
+
+using Status = ::ndk::ScopedAStatus;
+using ::aidl::android::media::BnResourceObserverService;
+using ::aidl::android::media::IResourceObserver;
+using ::aidl::android::media::MediaObservableFilter;
+using ::aidl::android::media::MediaObservableParcel;
+using ::aidl::android::media::MediaObservableType;
+using ::aidl::android::media::MediaObservableEvent;
+
+class ResourceObserverService : public BnResourceObserverService {
+public:
+
+    static char const *getServiceName() { return "media.resource_observer"; }
+    static std::shared_ptr<ResourceObserverService> instantiate();
+
+    virtual inline binder_status_t dump(
+            int /*fd*/, const char** /*args*/, uint32_t /*numArgs*/);
+
+    ResourceObserverService();
+    virtual ~ResourceObserverService() {}
+
+    // IResourceObserverService interface
+    Status registerObserver(const std::shared_ptr<IResourceObserver>& in_observer,
+            const std::vector<MediaObservableFilter>& in_filters) override;
+
+    Status unregisterObserver(const std::shared_ptr<IResourceObserver>& in_observer) override;
+    // ~IResourceObserverService interface
+
+    // Called by ResourceManagerService when resources are added.
+    void onResourceAdded(int uid, int pid, const ResourceList &resources);
+
+    // Called by ResourceManagerService when resources are removed.
+    void onResourceRemoved(int uid, int pid, const ResourceList &resources);
+
+private:
+    struct ObserverInfo {
+        ::ndk::SpAIBinder binder;
+        std::shared_ptr<IResourceObserver> observer;
+        std::vector<MediaObservableFilter> filters;
+    };
+    struct DeathRecipient;
+
+    // Below maps are all keyed on the observer's binder ptr value.
+    using ObserverInfoMap = std::map<uintptr_t, ObserverInfo>;
+    using SubscriberMap = std::map<uintptr_t, std::shared_ptr<IResourceObserver>>;
+
+    std::mutex mObserverLock;
+    // Binder->ObserverInfo
+    ObserverInfoMap mObserverInfoMap GUARDED_BY(mObserverLock);
+    // Observable(<type,event>)->Subscribers
+    std::map<MediaObservableFilter, SubscriberMap> mObservableToSubscribersMap
+            GUARDED_BY(mObserverLock);
+
+    ::ndk::ScopedAIBinder_DeathRecipient mDeathRecipient;
+
+    // Binder death handling.
+    static std::mutex sDeathRecipientLock;
+    static std::map<uintptr_t, std::shared_ptr<DeathRecipient>> sDeathRecipientMap
+            GUARDED_BY(sDeathRecipientLock);
+    static void BinderDiedCallback(void* cookie);
+
+    void notifyObservers(MediaObservableEvent event,
+            int uid, int pid, const ResourceList &resources);
+};
+
+// ----------------------------------------------------------------------------
+} // namespace android
+
+#endif // ANDROID_MEDIA_RESOURCE_OBSERVER_SERVICE_H
diff --git a/services/mediaresourcemanager/TEST_MAPPING b/services/mediaresourcemanager/TEST_MAPPING
index 418b159..52ad441 100644
--- a/services/mediaresourcemanager/TEST_MAPPING
+++ b/services/mediaresourcemanager/TEST_MAPPING
@@ -5,6 +5,9 @@
     },
     {
        "name": "ServiceLog_test"
+    },
+    {
+       "name": "ResourceObserverService_test"
     }
   ]
 }
diff --git a/services/mediaresourcemanager/aidl/android/media/IResourceObserver.aidl b/services/mediaresourcemanager/aidl/android/media/IResourceObserver.aidl
new file mode 100644
index 0000000..462009a
--- /dev/null
+++ b/services/mediaresourcemanager/aidl/android/media/IResourceObserver.aidl
@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) 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.media;
+
+import android.media.MediaObservableEvent;
+import android.media.MediaObservableParcel;
+
+/**
+ * IResourceObserver interface for receiving observable resource updates
+ * from IResourceObserverService.
+ *
+ * {@hide}
+ */
+interface IResourceObserver {
+    /**
+     * Called when an observed resource is granted to a client.
+     *
+     * @param event the status change that happened to the resource.
+     * @param uid uid to which the resource is associated.
+     * @param pid pid to which the resource is associated.
+     * @param observables the resources whose status has changed.
+     */
+    oneway void onStatusChanged(MediaObservableEvent event,
+        int uid, int pid, in MediaObservableParcel[] observables);
+}
diff --git a/services/mediaresourcemanager/aidl/android/media/IResourceObserverService.aidl b/services/mediaresourcemanager/aidl/android/media/IResourceObserverService.aidl
new file mode 100644
index 0000000..08f4ca0
--- /dev/null
+++ b/services/mediaresourcemanager/aidl/android/media/IResourceObserverService.aidl
@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) 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.media;
+
+import android.media.IResourceObserver;
+import android.media.MediaObservableFilter;
+
+/**
+ * IResourceObserverService interface for registering an IResourceObserver
+ * callback to receive status updates about observable media resources.
+ *
+ * {@hide}
+ */
+interface IResourceObserverService {
+
+    /**
+     * Register an observer on the IResourceObserverService to receive
+     * status updates for observable resources.
+     *
+     * @param observer the observer to register.
+     * @param filters an array of filters for resources and events to receive
+     *                updates for.
+     */
+    void registerObserver(
+            IResourceObserver observer,
+            in MediaObservableFilter[] filters);
+
+    /**
+     * Unregister an observer from the IResourceObserverService.
+     * The observer will stop receiving the status updates.
+     *
+     * @param observer the observer to unregister.
+     */
+    void unregisterObserver(IResourceObserver observer);
+}
diff --git a/services/mediaresourcemanager/aidl/android/media/MediaObservableEvent.aidl b/services/mediaresourcemanager/aidl/android/media/MediaObservableEvent.aidl
new file mode 100644
index 0000000..56ab24d
--- /dev/null
+++ b/services/mediaresourcemanager/aidl/android/media/MediaObservableEvent.aidl
@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 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.media;
+
+/**
+ * Enums for media observable events.
+ *
+ * These values are used as bitmasks to indicate the events that the
+ * observer is interested in in the MediaObservableFilter objects passed to
+ * IResourceObserverService::registerObserver().
+ *
+ * {@hide}
+ */
+@Backing(type="long")
+enum MediaObservableEvent {
+    /**
+     * A media resource is granted to a client and becomes busy.
+     */
+    kBusy = 1,
+
+    /**
+     * A media resource is released by a client and becomes idle.
+     */
+    kIdle = 2,
+
+    /**
+     * A bitmask that covers all observable events defined.
+     */
+    kAll = ~0,
+}
diff --git a/services/mediaresourcemanager/aidl/android/media/MediaObservableFilter.aidl b/services/mediaresourcemanager/aidl/android/media/MediaObservableFilter.aidl
new file mode 100644
index 0000000..38f7e39
--- /dev/null
+++ b/services/mediaresourcemanager/aidl/android/media/MediaObservableFilter.aidl
@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 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.media;
+
+import android.media.MediaObservableType;
+import android.media.MediaObservableEvent;
+
+/**
+ * Description of an observable resource and its associated events that the
+ * observer is interested in.
+ *
+ * {@hide}
+ */
+parcelable MediaObservableFilter {
+    /**
+     * Type of the observable media resource.
+     */
+    MediaObservableType type;
+
+    /**
+     * Events that the observer is interested in.
+     *
+     * This field is a bitwise-OR of the events in MediaObservableEvent. If a
+     * particular event's bit is set, it means that updates should be sent for
+     * that event. For example, if the observer is only interested in receiving
+     * updates when a resource becomes available, it should only set 'kIdle'.
+     */
+    MediaObservableEvent eventFilter;
+}
diff --git a/services/mediaresourcemanager/aidl/android/media/MediaObservableParcel.aidl b/services/mediaresourcemanager/aidl/android/media/MediaObservableParcel.aidl
new file mode 100644
index 0000000..c4233e1
--- /dev/null
+++ b/services/mediaresourcemanager/aidl/android/media/MediaObservableParcel.aidl
@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) 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.media;
+
+import android.media.MediaObservableType;
+
+/**
+ * Description of an observable resource whose status has changed.
+ *
+ * {@hide}
+ */
+parcelable MediaObservableParcel {
+    /**
+     * Type of the observable media resource.
+     */
+    MediaObservableType type;// = MediaObservableType::kInvalid;
+
+    /**
+     * Number of units of the observable resource (number of codecs, bytes of
+     * graphic memory, etc.).
+     */
+    long value = 0;
+}
diff --git a/services/mediaresourcemanager/aidl/android/media/MediaObservableType.aidl b/services/mediaresourcemanager/aidl/android/media/MediaObservableType.aidl
new file mode 100644
index 0000000..ed202da
--- /dev/null
+++ b/services/mediaresourcemanager/aidl/android/media/MediaObservableType.aidl
@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) 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.media;
+
+/**
+ * Type enums of observable media resources.
+ *
+ * {@hide}
+ */
+@Backing(type="int")
+enum MediaObservableType {
+    kInvalid = 0,
+
+    //kVideoStart = 1000,
+    kVideoSecureCodec = 1000,
+    kVideoNonSecureCodec = 1001,
+
+    //kAudioStart = 2000,
+
+    //kGraphicMemory = 3000,
+}
diff --git a/services/mediaresourcemanager/test/Android.bp b/services/mediaresourcemanager/test/Android.bp
index 6b2ef69..7bdfc6f 100644
--- a/services/mediaresourcemanager/test/Android.bp
+++ b/services/mediaresourcemanager/test/Android.bp
@@ -40,3 +40,26 @@
         "-Wall",
     ],
 }
+
+cc_test {
+    name: "ResourceObserverService_test",
+    srcs: ["ResourceObserverService_test.cpp"],
+    test_suites: ["device-tests"],
+    static_libs: ["libresourcemanagerservice"],
+    shared_libs: [
+        "libbinder",
+        "libbinder_ndk",
+        "liblog",
+        "libmedia",
+        "libutils",
+        "resourceobserver_aidl_interface-ndk_platform",
+    ],
+    include_dirs: [
+        "frameworks/av/include",
+        "frameworks/av/services/mediaresourcemanager",
+    ],
+    cflags: [
+        "-Werror",
+        "-Wall",
+    ],
+}
diff --git a/services/mediaresourcemanager/test/ResourceManagerServiceTestUtils.h b/services/mediaresourcemanager/test/ResourceManagerServiceTestUtils.h
new file mode 100644
index 0000000..84c320d
--- /dev/null
+++ b/services/mediaresourcemanager/test/ResourceManagerServiceTestUtils.h
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2015 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.
+ */
+
+#include <gtest/gtest.h>
+
+#include "ResourceManagerService.h"
+#include <aidl/android/media/BnResourceManagerClient.h>
+#include <media/MediaResource.h>
+#include <media/MediaResourcePolicy.h>
+#include <media/stagefright/foundation/ADebug.h>
+#include <media/stagefright/ProcessInfoInterface.h>
+
+namespace aidl {
+namespace android {
+namespace media {
+bool operator== (const MediaResourceParcel& lhs, const MediaResourceParcel& rhs) {
+    return lhs.type == rhs.type && lhs.subType == rhs.subType &&
+            lhs.id == rhs.id && lhs.value == rhs.value;
+}
+}}}
+
+namespace android {
+
+using Status = ::ndk::ScopedAStatus;
+using ::aidl::android::media::BnResourceManagerClient;
+using ::aidl::android::media::IResourceManagerService;
+using ::aidl::android::media::IResourceManagerClient;
+using ::aidl::android::media::MediaResourceParcel;
+
+static int64_t getId(const std::shared_ptr<IResourceManagerClient>& client) {
+    return (int64_t) client.get();
+}
+
+struct TestProcessInfo : public ProcessInfoInterface {
+    TestProcessInfo() {}
+    virtual ~TestProcessInfo() {}
+
+    virtual bool getPriority(int pid, int *priority) {
+        // For testing, use pid as priority.
+        // Lower the value higher the priority.
+        *priority = pid;
+        return true;
+    }
+
+    virtual bool isValidPid(int /* pid */) {
+        return true;
+    }
+
+private:
+    DISALLOW_EVIL_CONSTRUCTORS(TestProcessInfo);
+};
+
+struct TestSystemCallback :
+        public ResourceManagerService::SystemCallbackInterface {
+    TestSystemCallback() :
+        mLastEvent({EventType::INVALID, 0}), mEventCount(0) {}
+
+    enum EventType {
+        INVALID          = -1,
+        VIDEO_ON         = 0,
+        VIDEO_OFF        = 1,
+        VIDEO_RESET      = 2,
+        CPUSET_ENABLE    = 3,
+        CPUSET_DISABLE   = 4,
+    };
+
+    struct EventEntry {
+        EventType type;
+        int arg;
+    };
+
+    virtual void noteStartVideo(int uid) override {
+        mLastEvent = {EventType::VIDEO_ON, uid};
+        mEventCount++;
+    }
+
+    virtual void noteStopVideo(int uid) override {
+        mLastEvent = {EventType::VIDEO_OFF, uid};
+        mEventCount++;
+    }
+
+    virtual void noteResetVideo() override {
+        mLastEvent = {EventType::VIDEO_RESET, 0};
+        mEventCount++;
+    }
+
+    virtual bool requestCpusetBoost(bool enable) override {
+        mLastEvent = {enable ? EventType::CPUSET_ENABLE : EventType::CPUSET_DISABLE, 0};
+        mEventCount++;
+        return true;
+    }
+
+    size_t eventCount() { return mEventCount; }
+    EventType lastEventType() { return mLastEvent.type; }
+    EventEntry lastEvent() { return mLastEvent; }
+
+protected:
+    virtual ~TestSystemCallback() {}
+
+private:
+    EventEntry mLastEvent;
+    size_t mEventCount;
+
+    DISALLOW_EVIL_CONSTRUCTORS(TestSystemCallback);
+};
+
+
+struct TestClient : public BnResourceManagerClient {
+    TestClient(int pid, const std::shared_ptr<ResourceManagerService> &service)
+        : mReclaimed(false), mPid(pid), mService(service) {}
+
+    Status reclaimResource(bool* _aidl_return) override {
+        mService->removeClient(mPid, getId(ref<TestClient>()));
+        mReclaimed = true;
+        *_aidl_return = true;
+        return Status::ok();
+    }
+
+    Status getName(::std::string* _aidl_return) override {
+        *_aidl_return = "test_client";
+        return Status::ok();
+    }
+
+    bool reclaimed() const {
+        return mReclaimed;
+    }
+
+    void reset() {
+        mReclaimed = false;
+    }
+
+    virtual ~TestClient() {}
+
+private:
+    bool mReclaimed;
+    int mPid;
+    std::shared_ptr<ResourceManagerService> mService;
+    DISALLOW_EVIL_CONSTRUCTORS(TestClient);
+};
+
+static const int kTestPid1 = 30;
+static const int kTestUid1 = 1010;
+
+static const int kTestPid2 = 20;
+static const int kTestUid2 = 1011;
+
+static const int kLowPriorityPid = 40;
+static const int kMidPriorityPid = 25;
+static const int kHighPriorityPid = 10;
+
+using EventType = TestSystemCallback::EventType;
+using EventEntry = TestSystemCallback::EventEntry;
+bool operator== (const EventEntry& lhs, const EventEntry& rhs) {
+    return lhs.type == rhs.type && lhs.arg == rhs.arg;
+}
+
+#define CHECK_STATUS_TRUE(condition) \
+    EXPECT_TRUE((condition).isOk() && (result))
+
+#define CHECK_STATUS_FALSE(condition) \
+    EXPECT_TRUE((condition).isOk() && !(result))
+
+class ResourceManagerServiceTestBase : public ::testing::Test {
+public:
+    ResourceManagerServiceTestBase()
+        : mSystemCB(new TestSystemCallback()),
+          mService(::ndk::SharedRefBase::make<ResourceManagerService>(
+                  new TestProcessInfo, mSystemCB)),
+          mTestClient1(::ndk::SharedRefBase::make<TestClient>(kTestPid1, mService)),
+          mTestClient2(::ndk::SharedRefBase::make<TestClient>(kTestPid2, mService)),
+          mTestClient3(::ndk::SharedRefBase::make<TestClient>(kTestPid2, mService)) {
+    }
+
+    sp<TestSystemCallback> mSystemCB;
+    std::shared_ptr<ResourceManagerService> mService;
+    std::shared_ptr<IResourceManagerClient> mTestClient1;
+    std::shared_ptr<IResourceManagerClient> mTestClient2;
+    std::shared_ptr<IResourceManagerClient> mTestClient3;
+
+protected:
+    static bool isEqualResources(const std::vector<MediaResourceParcel> &resources1,
+            const ResourceList &resources2) {
+        // convert resource1 to ResourceList
+        ResourceList r1;
+        for (size_t i = 0; i < resources1.size(); ++i) {
+            const auto &res = resources1[i];
+            const auto resType = std::tuple(res.type, res.subType, res.id);
+            r1[resType] = res;
+        }
+        return r1 == resources2;
+    }
+
+    static void expectEqResourceInfo(const ResourceInfo &info,
+            int uid,
+            std::shared_ptr<IResourceManagerClient> client,
+            const std::vector<MediaResourceParcel> &resources) {
+        EXPECT_EQ(uid, info.uid);
+        EXPECT_EQ(client, info.client);
+        EXPECT_TRUE(isEqualResources(resources, info.resources));
+    }
+};
+
+} // namespace android
diff --git a/services/mediaresourcemanager/test/ResourceManagerService_test.cpp b/services/mediaresourcemanager/test/ResourceManagerService_test.cpp
index 702935d..15601aa 100644
--- a/services/mediaresourcemanager/test/ResourceManagerService_test.cpp
+++ b/services/mediaresourcemanager/test/ResourceManagerService_test.cpp
@@ -16,197 +16,17 @@
 
 //#define LOG_NDEBUG 0
 #define LOG_TAG "ResourceManagerService_test"
+
 #include <utils/Log.h>
 
-#include <gtest/gtest.h>
-
+#include "ResourceManagerServiceTestUtils.h"
 #include "ResourceManagerService.h"
-#include <aidl/android/media/BnResourceManagerClient.h>
-#include <media/MediaResource.h>
-#include <media/MediaResourcePolicy.h>
-#include <media/stagefright/foundation/ADebug.h>
-#include <media/stagefright/ProcessInfoInterface.h>
-
-namespace aidl {
-namespace android {
-namespace media {
-bool operator== (const MediaResourceParcel& lhs, const MediaResourceParcel& rhs) {
-    return lhs.type == rhs.type && lhs.subType == rhs.subType &&
-            lhs.id == rhs.id && lhs.value == rhs.value;
-}}}}
 
 namespace android {
 
-using Status = ::ndk::ScopedAStatus;
-using ::aidl::android::media::BnResourceManagerClient;
-using ::aidl::android::media::IResourceManagerService;
-using ::aidl::android::media::IResourceManagerClient;
-
-static int64_t getId(const std::shared_ptr<IResourceManagerClient>& client) {
-    return (int64_t) client.get();
-}
-
-struct TestProcessInfo : public ProcessInfoInterface {
-    TestProcessInfo() {}
-    virtual ~TestProcessInfo() {}
-
-    virtual bool getPriority(int pid, int *priority) {
-        // For testing, use pid as priority.
-        // Lower the value higher the priority.
-        *priority = pid;
-        return true;
-    }
-
-    virtual bool isValidPid(int /* pid */) {
-        return true;
-    }
-
-private:
-    DISALLOW_EVIL_CONSTRUCTORS(TestProcessInfo);
-};
-
-struct TestSystemCallback :
-        public ResourceManagerService::SystemCallbackInterface {
-    TestSystemCallback() :
-        mLastEvent({EventType::INVALID, 0}), mEventCount(0) {}
-
-    enum EventType {
-        INVALID          = -1,
-        VIDEO_ON         = 0,
-        VIDEO_OFF        = 1,
-        VIDEO_RESET      = 2,
-        CPUSET_ENABLE    = 3,
-        CPUSET_DISABLE   = 4,
-    };
-
-    struct EventEntry {
-        EventType type;
-        int arg;
-    };
-
-    virtual void noteStartVideo(int uid) override {
-        mLastEvent = {EventType::VIDEO_ON, uid};
-        mEventCount++;
-    }
-
-    virtual void noteStopVideo(int uid) override {
-        mLastEvent = {EventType::VIDEO_OFF, uid};
-        mEventCount++;
-    }
-
-    virtual void noteResetVideo() override {
-        mLastEvent = {EventType::VIDEO_RESET, 0};
-        mEventCount++;
-    }
-
-    virtual bool requestCpusetBoost(bool enable) override {
-        mLastEvent = {enable ? EventType::CPUSET_ENABLE : EventType::CPUSET_DISABLE, 0};
-        mEventCount++;
-        return true;
-    }
-
-    size_t eventCount() { return mEventCount; }
-    EventType lastEventType() { return mLastEvent.type; }
-    EventEntry lastEvent() { return mLastEvent; }
-
-protected:
-    virtual ~TestSystemCallback() {}
-
-private:
-    EventEntry mLastEvent;
-    size_t mEventCount;
-
-    DISALLOW_EVIL_CONSTRUCTORS(TestSystemCallback);
-};
-
-
-struct TestClient : public BnResourceManagerClient {
-    TestClient(int pid, const std::shared_ptr<ResourceManagerService> &service)
-        : mReclaimed(false), mPid(pid), mService(service) {}
-
-    Status reclaimResource(bool* _aidl_return) override {
-        mService->removeClient(mPid, getId(ref<TestClient>()));
-        mReclaimed = true;
-        *_aidl_return = true;
-        return Status::ok();
-    }
-
-    Status getName(::std::string* _aidl_return) override {
-        *_aidl_return = "test_client";
-        return Status::ok();
-    }
-
-    bool reclaimed() const {
-        return mReclaimed;
-    }
-
-    void reset() {
-        mReclaimed = false;
-    }
-
-    virtual ~TestClient() {}
-
-private:
-    bool mReclaimed;
-    int mPid;
-    std::shared_ptr<ResourceManagerService> mService;
-    DISALLOW_EVIL_CONSTRUCTORS(TestClient);
-};
-
-static const int kTestPid1 = 30;
-static const int kTestUid1 = 1010;
-
-static const int kTestPid2 = 20;
-static const int kTestUid2 = 1011;
-
-static const int kLowPriorityPid = 40;
-static const int kMidPriorityPid = 25;
-static const int kHighPriorityPid = 10;
-
-using EventType = TestSystemCallback::EventType;
-using EventEntry = TestSystemCallback::EventEntry;
-bool operator== (const EventEntry& lhs, const EventEntry& rhs) {
-    return lhs.type == rhs.type && lhs.arg == rhs.arg;
-}
-
-#define CHECK_STATUS_TRUE(condition) \
-    EXPECT_TRUE((condition).isOk() && (result))
-
-#define CHECK_STATUS_FALSE(condition) \
-    EXPECT_TRUE((condition).isOk() && !(result))
-
-class ResourceManagerServiceTest : public ::testing::Test {
+class ResourceManagerServiceTest : public ResourceManagerServiceTestBase {
 public:
-    ResourceManagerServiceTest()
-        : mSystemCB(new TestSystemCallback()),
-          mService(::ndk::SharedRefBase::make<ResourceManagerService>(
-                  new TestProcessInfo, mSystemCB)),
-          mTestClient1(::ndk::SharedRefBase::make<TestClient>(kTestPid1, mService)),
-          mTestClient2(::ndk::SharedRefBase::make<TestClient>(kTestPid2, mService)),
-          mTestClient3(::ndk::SharedRefBase::make<TestClient>(kTestPid2, mService)) {
-    }
-
-protected:
-    static bool isEqualResources(const std::vector<MediaResourceParcel> &resources1,
-            const ResourceList &resources2) {
-        // convert resource1 to ResourceList
-        ResourceList r1;
-        for (size_t i = 0; i < resources1.size(); ++i) {
-            const auto &res = resources1[i];
-            const auto resType = std::tuple(res.type, res.subType, res.id);
-            r1[resType] = res;
-        }
-        return r1 == resources2;
-    }
-
-    static void expectEqResourceInfo(const ResourceInfo &info,
-            int uid,
-            std::shared_ptr<IResourceManagerClient> client,
-            const std::vector<MediaResourceParcel> &resources) {
-        EXPECT_EQ(uid, info.uid);
-        EXPECT_EQ(client, info.client);
-        EXPECT_TRUE(isEqualResources(resources, info.resources));
-    }
+    ResourceManagerServiceTest() : ResourceManagerServiceTestBase() {}
 
     void verifyClients(bool c1, bool c2, bool c3) {
         TestClient *client1 = static_cast<TestClient*>(mTestClient1.get());
@@ -881,12 +701,6 @@
         EXPECT_EQ(4u, mSystemCB->eventCount());
         EXPECT_EQ(EventType::CPUSET_DISABLE, mSystemCB->lastEventType());
     }
-
-    sp<TestSystemCallback> mSystemCB;
-    std::shared_ptr<ResourceManagerService> mService;
-    std::shared_ptr<IResourceManagerClient> mTestClient1;
-    std::shared_ptr<IResourceManagerClient> mTestClient2;
-    std::shared_ptr<IResourceManagerClient> mTestClient3;
 };
 
 TEST_F(ResourceManagerServiceTest, config) {
diff --git a/services/mediaresourcemanager/test/ResourceObserverService_test.cpp b/services/mediaresourcemanager/test/ResourceObserverService_test.cpp
new file mode 100644
index 0000000..4c26246
--- /dev/null
+++ b/services/mediaresourcemanager/test/ResourceObserverService_test.cpp
@@ -0,0 +1,463 @@
+/*
+ * 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.
+ */
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "ResourceObserverService_test"
+
+#include <iostream>
+#include <list>
+
+#include <aidl/android/media/BnResourceObserver.h>
+#include <utils/Log.h>
+#include "ResourceObserverService.h"
+#include "ResourceManagerServiceTestUtils.h"
+
+namespace aidl {
+namespace android {
+namespace media {
+bool operator==(const MediaObservableParcel& lhs, const MediaObservableParcel& rhs) {
+    return lhs.type == rhs.type && lhs.value == rhs.value;
+}
+}}} // namespace ::aidl::android::media
+
+namespace android {
+
+using ::aidl::android::media::BnResourceObserver;
+using ::aidl::android::media::MediaObservableParcel;
+using ::aidl::android::media::MediaObservableType;
+
+#define BUSY ::aidl::android::media::MediaObservableEvent::kBusy
+#define IDLE ::aidl::android::media::MediaObservableEvent::kIdle
+#define ALL ::aidl::android::media::MediaObservableEvent::kAll
+
+struct EventTracker {
+    struct Event {
+        enum { NoEvent, Busy, Idle } type = NoEvent;
+        int uid = 0;
+        int pid = 0;
+        std::vector<MediaObservableParcel> observables;
+    };
+
+    static const Event NoEvent;
+
+    static std::string toString(const MediaObservableParcel& observable) {
+        return "{" + ::aidl::android::media::toString(observable.type)
+        + ", " + std::to_string(observable.value) + "}";
+    }
+    static std::string toString(const Event& event) {
+        std::string eventStr;
+        switch (event.type) {
+        case Event::Busy:
+            eventStr = "Busy";
+            break;
+        case Event::Idle:
+            eventStr = "Idle";
+            break;
+        default:
+            return "NoEvent";
+        }
+        std::string observableStr;
+        for (auto &observable : event.observables) {
+            if (!observableStr.empty()) {
+                observableStr += ", ";
+            }
+            observableStr += toString(observable);
+        }
+        return "{" + eventStr + ", " + std::to_string(event.uid) + ", "
+                + std::to_string(event.pid) + ", {" + observableStr + "}}";
+    }
+
+    static Event Busy(int uid, int pid, const std::vector<MediaObservableParcel>& observables) {
+        return { Event::Busy, uid, pid, observables };
+    }
+    static Event Idle(int uid, int pid, const std::vector<MediaObservableParcel>& observables) {
+        return { Event::Idle, uid, pid, observables };
+    }
+
+    // Pop 1 event from front, wait for up to timeoutUs if empty.
+    const Event& pop(int64_t timeoutUs = 0) {
+        std::unique_lock lock(mLock);
+
+        if (mEventQueue.empty() && timeoutUs > 0) {
+            mCondition.wait_for(lock, std::chrono::microseconds(timeoutUs));
+        }
+
+        if (mEventQueue.empty()) {
+            mPoppedEvent = NoEvent;
+        } else {
+            mPoppedEvent = *mEventQueue.begin();
+            mEventQueue.pop_front();
+        }
+
+        return mPoppedEvent;
+    }
+
+    // Push 1 event to back.
+    void append(const Event& event) {
+        ALOGD("%s", toString(event).c_str());
+
+        std::unique_lock lock(mLock);
+
+        mEventQueue.push_back(event);
+        mCondition.notify_one();
+    }
+
+private:
+    std::mutex mLock;
+    std::condition_variable mCondition;
+    Event mPoppedEvent;
+    std::list<Event> mEventQueue;
+};
+
+const EventTracker::Event EventTracker::NoEvent;
+
+// Operators for GTest macros.
+bool operator==(const EventTracker::Event& lhs, const EventTracker::Event& rhs) {
+    return lhs.type == rhs.type && lhs.uid == rhs.uid && lhs.pid == rhs.pid &&
+            lhs.observables == rhs.observables;
+}
+
+std::ostream& operator<<(std::ostream& str, const EventTracker::Event& v) {
+    str << EventTracker::toString(v);
+    return str;
+}
+
+struct TestObserver : public BnResourceObserver, public EventTracker {
+    TestObserver(const char *name) : mName(name) {}
+    ~TestObserver() = default;
+    Status onStatusChanged(MediaObservableEvent event, int32_t uid, int32_t pid,
+            const std::vector<MediaObservableParcel>& observables) override {
+        ALOGD("%s: %s", mName.c_str(), __FUNCTION__);
+        if (event == MediaObservableEvent::kBusy) {
+            append(Busy(uid, pid, observables));
+        } else {
+            append(Idle(uid, pid, observables));
+        }
+
+        return Status::ok();
+    }
+    std::string mName;
+};
+
+class ResourceObserverServiceTest : public ResourceManagerServiceTestBase {
+public:
+    ResourceObserverServiceTest() : ResourceManagerServiceTestBase(),
+        mObserverService(::ndk::SharedRefBase::make<ResourceObserverService>()),
+        mTestObserver1(::ndk::SharedRefBase::make<TestObserver>("observer1")),
+        mTestObserver2(::ndk::SharedRefBase::make<TestObserver>("observer2")),
+        mTestObserver3(::ndk::SharedRefBase::make<TestObserver>("observer3")) {
+        mService->setObserverService(mObserverService);
+    }
+
+    void registerObservers(MediaObservableEvent filter = ALL) {
+        std::vector<MediaObservableFilter> filters1, filters2, filters3;
+        filters1 = {{MediaObservableType::kVideoSecureCodec, filter}};
+        filters2 = {{MediaObservableType::kVideoNonSecureCodec, filter}};
+        filters3 = {{MediaObservableType::kVideoSecureCodec, filter},
+                   {MediaObservableType::kVideoNonSecureCodec, filter}};
+
+        // mTestObserver1 monitors secure video codecs.
+        EXPECT_TRUE(mObserverService->registerObserver(mTestObserver1, filters1).isOk());
+
+        // mTestObserver2 monitors non-secure video codecs.
+        EXPECT_TRUE(mObserverService->registerObserver(mTestObserver2, filters2).isOk());
+
+        // mTestObserver3 monitors both secure & non-secure video codecs.
+        EXPECT_TRUE(mObserverService->registerObserver(mTestObserver3, filters3).isOk());
+    }
+
+protected:
+    std::shared_ptr<ResourceObserverService> mObserverService;
+    std::shared_ptr<TestObserver> mTestObserver1;
+    std::shared_ptr<TestObserver> mTestObserver2;
+    std::shared_ptr<TestObserver> mTestObserver3;
+};
+
+TEST_F(ResourceObserverServiceTest, testRegisterObserver) {
+    std::vector<MediaObservableFilter> filters1;
+    Status status;
+
+    // Register with empty observables should fail.
+    status = mObserverService->registerObserver(mTestObserver1, filters1);
+    EXPECT_FALSE(status.isOk());
+    EXPECT_EQ(status.getServiceSpecificError(), BAD_VALUE);
+
+    // mTestObserver1 monitors secure video codecs.
+    filters1 = {{MediaObservableType::kVideoSecureCodec, ALL}};
+    EXPECT_TRUE(mObserverService->registerObserver(mTestObserver1, filters1).isOk());
+
+    // Register duplicates should fail.
+    status = mObserverService->registerObserver(mTestObserver1, filters1);
+    EXPECT_FALSE(status.isOk());
+    EXPECT_EQ(status.getServiceSpecificError(), ALREADY_EXISTS);
+}
+
+TEST_F(ResourceObserverServiceTest, testUnregisterObserver) {
+    std::vector<MediaObservableFilter> filters1;
+    Status status;
+
+    // Unregister without registering first should fail.
+    status = mObserverService->unregisterObserver(mTestObserver1);
+    EXPECT_FALSE(status.isOk());
+    EXPECT_EQ(status.getServiceSpecificError(), NAME_NOT_FOUND);
+
+    // mTestObserver1 monitors secure video codecs.
+    filters1 = {{MediaObservableType::kVideoSecureCodec, ALL}};
+    EXPECT_TRUE(mObserverService->registerObserver(mTestObserver1, filters1).isOk());
+    EXPECT_TRUE(mObserverService->unregisterObserver(mTestObserver1).isOk());
+
+    // Unregister again should fail.
+    status = mObserverService->unregisterObserver(mTestObserver1);
+    EXPECT_FALSE(status.isOk());
+    EXPECT_EQ(status.getServiceSpecificError(), NAME_NOT_FOUND);
+}
+
+TEST_F(ResourceObserverServiceTest, testAddResourceBasic) {
+    registerObservers();
+
+    std::vector<MediaObservableParcel> observables1, observables2, observables3;
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 1}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 1}};
+    observables3 = {{MediaObservableType::kVideoSecureCodec, 1},
+                   {MediaObservableType::kVideoNonSecureCodec, 1}};
+
+    std::vector<MediaResourceParcel> resources;
+    // Add secure video codec.
+    resources = {MediaResource::CodecResource(1 /*secure*/, 1 /*video*/)};
+    mService->addResource(kTestPid1, kTestUid1, getId(mTestClient1), mTestClient1, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid1, kTestPid1, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid1, kTestPid1, observables1));
+
+    // Add non-secure video codec.
+    resources = {MediaResource::CodecResource(0 /*secure*/, 1 /*video*/)};
+    mService->addResource(kTestPid2, kTestUid2, getId(mTestClient2), mTestClient2, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+
+    // Add secure & non-secure video codecs.
+    resources = {MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 1 /*video*/)};
+    mService->addResource(kTestPid2, kTestUid2, getId(mTestClient3), mTestClient3, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables3));
+
+    // Add additional audio codecs, should be ignored.
+    resources.push_back(MediaResource::CodecResource(1 /*secure*/, 0 /*video*/));
+    resources.push_back(MediaResource::CodecResource(0 /*secure*/, 0 /*video*/));
+    mService->addResource(kTestPid1, kTestUid1, getId(mTestClient1), mTestClient1, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid1, kTestPid1, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Busy(kTestUid1, kTestPid1, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid1, kTestPid1, observables3));
+}
+
+TEST_F(ResourceObserverServiceTest, testAddResourceMultiple) {
+    registerObservers();
+
+    std::vector<MediaObservableParcel> observables1, observables2, observables3;
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 1}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 1}};
+    observables3 = {{MediaObservableType::kVideoSecureCodec, 1},
+                   {MediaObservableType::kVideoNonSecureCodec, 1}};
+
+    std::vector<MediaResourceParcel> resources;
+
+    // Add multiple secure & non-secure video codecs.
+    // Multiple entries of the same type should be merged, count should be propagated correctly.
+    resources = {MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 1 /*video*/, 3 /*count*/)};
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 2}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 3}};
+    observables3 = {{MediaObservableType::kVideoSecureCodec, 2},
+                   {MediaObservableType::kVideoNonSecureCodec, 3}};
+    mService->addResource(kTestPid2, kTestUid2, getId(mTestClient3), mTestClient3, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables3));
+}
+
+TEST_F(ResourceObserverServiceTest, testRemoveResourceBasic) {
+    registerObservers();
+
+    std::vector<MediaObservableParcel> observables1, observables2, observables3;
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 1}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 1}};
+    observables3 = {{MediaObservableType::kVideoSecureCodec, 1},
+                   {MediaObservableType::kVideoNonSecureCodec, 1}};
+
+    std::vector<MediaResourceParcel> resources;
+    // Add secure video codec to client1.
+    resources = {MediaResource::CodecResource(1 /*secure*/, 1 /*video*/)};
+    mService->addResource(kTestPid1, kTestUid1, getId(mTestClient1), mTestClient1, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid1, kTestPid1, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid1, kTestPid1, observables1));
+    // Remove secure video codec. observer 1&3 should receive updates.
+    mService->removeResource(kTestPid1, getId(mTestClient1), resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Idle(kTestUid1, kTestPid1, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Idle(kTestUid1, kTestPid1, observables1));
+    // Remove secure video codec again, should have no event.
+    mService->removeResource(kTestPid1, getId(mTestClient1), resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::NoEvent);
+    // Remove client1, should have no event.
+    mService->removeClient(kTestPid1, getId(mTestClient1));
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::NoEvent);
+
+    // Add non-secure video codec to client2.
+    resources = {MediaResource::CodecResource(0 /*secure*/, 1 /*video*/)};
+    mService->addResource(kTestPid2, kTestUid2, getId(mTestClient2), mTestClient2, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+    // Remove client2, observer 2&3 should receive updates.
+    mService->removeClient(kTestPid2, getId(mTestClient2));
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+    // Remove non-secure codec after client2 removed, should have no event.
+    mService->removeResource(kTestPid2, getId(mTestClient2), resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::NoEvent);
+    // Remove client2 again, should have no event.
+    mService->removeClient(kTestPid2, getId(mTestClient2));
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::NoEvent);
+
+    // Add secure & non-secure video codecs, plus audio codecs (that's ignored).
+    resources = {MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(1 /*secure*/, 0 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 0 /*video*/)};
+    mService->addResource(kTestPid2, kTestUid2, getId(mTestClient3), mTestClient3, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables3));
+    // Remove one audio codec, should have no event.
+    resources = {MediaResource::CodecResource(1 /*secure*/, 0 /*video*/)};
+    mService->removeResource(kTestPid2, getId(mTestClient3), resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::NoEvent);
+    // Remove the other audio codec and the secure video codec, only secure video codec
+    // removal should be reported.
+    resources = {MediaResource::CodecResource(0 /*secure*/, 0 /*video*/),
+                 MediaResource::CodecResource(1 /*secure*/, 1 /*video*/)};
+    mService->removeResource(kTestPid2, getId(mTestClient3), resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables1));
+    // Remove client3 entirely. Non-secure video codec removal should be reported.
+    mService->removeClient(kTestPid2, getId(mTestClient3));
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+}
+
+TEST_F(ResourceObserverServiceTest, testRemoveResourceMultiple) {
+    registerObservers();
+
+    std::vector<MediaObservableParcel> observables1, observables2, observables3;
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 1}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 1}};
+    observables3 = {{MediaObservableType::kVideoSecureCodec, 1},
+                    {MediaObservableType::kVideoNonSecureCodec, 1}};
+
+    std::vector<MediaResourceParcel> resources;
+
+    // Add multiple secure & non-secure video codecs, plus audio codecs (that's ignored).
+    // (ResourceManager will merge these internally.)
+    resources = {MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 1 /*video*/, 4 /*count*/),
+                 MediaResource::CodecResource(1 /*secure*/, 0 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 0 /*video*/)};
+    mService->addResource(kTestPid2, kTestUid2, getId(mTestClient3), mTestClient3, resources);
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 1}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 4}};
+    observables3 = {{MediaObservableType::kVideoSecureCodec, 1},
+                    {MediaObservableType::kVideoNonSecureCodec, 4}};
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables3));
+    // Remove one audio codec, 2 secure video codecs and 2 non-secure video codecs.
+    // 1 secure video codec removal and 2 non-secure video codec removals should be reported.
+    resources = {MediaResource::CodecResource(0 /*secure*/, 0 /*video*/),
+                 MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 1 /*video*/, 2 /*count*/)};
+    mService->removeResource(kTestPid2, getId(mTestClient3), resources);
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 1}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 2}};
+    observables3 = {{MediaObservableType::kVideoSecureCodec, 1},
+                    {MediaObservableType::kVideoNonSecureCodec, 2}};
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables3));
+    // Remove client3 entirely. 2 non-secure video codecs removal should be reported.
+    mService->removeClient(kTestPid2, getId(mTestClient3));
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+}
+
+TEST_F(ResourceObserverServiceTest, testEventFilters) {
+    // Register observers with different event filters.
+    std::vector<MediaObservableFilter> filters1, filters2, filters3;
+    filters1 = {{MediaObservableType::kVideoSecureCodec, BUSY}};
+    filters2 = {{MediaObservableType::kVideoNonSecureCodec, IDLE}};
+    filters3 = {{MediaObservableType::kVideoSecureCodec, IDLE},
+               {MediaObservableType::kVideoNonSecureCodec, BUSY}};
+
+    // mTestObserver1 monitors secure video codecs.
+    EXPECT_TRUE(mObserverService->registerObserver(mTestObserver1, filters1).isOk());
+
+    // mTestObserver2 monitors non-secure video codecs.
+    EXPECT_TRUE(mObserverService->registerObserver(mTestObserver2, filters2).isOk());
+
+    // mTestObserver3 monitors both secure & non-secure video codecs.
+    EXPECT_TRUE(mObserverService->registerObserver(mTestObserver3, filters3).isOk());
+
+    std::vector<MediaObservableParcel> observables1, observables2;
+    observables1 = {{MediaObservableType::kVideoSecureCodec, 1}};
+    observables2 = {{MediaObservableType::kVideoNonSecureCodec, 1}};
+
+    std::vector<MediaResourceParcel> resources;
+
+    // Add secure & non-secure video codecs.
+    resources = {MediaResource::CodecResource(1 /*secure*/, 1 /*video*/),
+                 MediaResource::CodecResource(0 /*secure*/, 1 /*video*/)};
+    mService->addResource(kTestPid2, kTestUid2, getId(mTestClient3), mTestClient3, resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables1));
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Busy(kTestUid2, kTestPid2, observables2));
+
+    // Remove secure & non-secure video codecs.
+    mService->removeResource(kTestPid2, getId(mTestClient3), resources);
+    EXPECT_EQ(mTestObserver1->pop(), EventTracker::NoEvent);
+    EXPECT_EQ(mTestObserver2->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables2));
+    EXPECT_EQ(mTestObserver3->pop(), EventTracker::Idle(kTestUid2, kTestPid2, observables1));
+}
+
+} // namespace android
diff --git a/services/mediaresourcemanager/test/build_and_run_all_unit_tests.sh b/services/mediaresourcemanager/test/build_and_run_all_unit_tests.sh
new file mode 100755
index 0000000..1c4ae98
--- /dev/null
+++ b/services/mediaresourcemanager/test/build_and_run_all_unit_tests.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+#
+# Run tests in this directory.
+#
+
+if [ "$SYNC_FINISHED" != true ]; then
+  if [ -z "$ANDROID_BUILD_TOP" ]; then
+      echo "Android build environment not set"
+      exit -1
+  fi
+
+  # ensure we have mm
+  . $ANDROID_BUILD_TOP/build/envsetup.sh
+
+  mm
+
+  echo "waiting for device"
+
+  adb root && adb wait-for-device remount && adb sync
+fi
+
+echo "========================================"
+
+echo "testing ResourceManagerService"
+#adb shell /data/nativetest64/ResourceManagerService_test/ResourceManagerService_test
+adb shell /data/nativetest/ResourceManagerService_test/ResourceManagerService_test
+
+echo "testing ServiceLog"
+#adb shell /data/nativetest64/ServiceLog_test/ServiceLog_test
+adb shell /data/nativetest/ServiceLog_test/ServiceLog_test
+
+echo "testing ResourceObserverService"
+#adb shell /data/nativetest64/ResourceObserverService_test/ResourceObserverService_test
+adb shell /data/nativetest/ResourceObserverService_test/ResourceObserverService_test