diff --git a/media/libaudioclient/Android.bp b/media/libaudioclient/Android.bp
index df3dec7..b82754c 100644
--- a/media/libaudioclient/Android.bp
+++ b/media/libaudioclient/Android.bp
@@ -392,6 +392,8 @@
     srcs: [
         "aidl/android/media/AudioAttributesEx.aidl",
         "aidl/android/media/AudioMix.aidl",
+        "aidl/android/media/AudioMixerAttributesInternal.aidl",
+        "aidl/android/media/AudioMixerBehavior.aidl",
         "aidl/android/media/AudioMixCallbackFlag.aidl",
         "aidl/android/media/AudioMixMatchCriterion.aidl",
         "aidl/android/media/AudioMixMatchCriterionValue.aidl",
diff --git a/media/libaudioclient/AudioSystem.cpp b/media/libaudioclient/AudioSystem.cpp
index fa9239f..7309cad 100644
--- a/media/libaudioclient/AudioSystem.cpp
+++ b/media/libaudioclient/AudioSystem.cpp
@@ -34,6 +34,7 @@
 
 #include <system/audio.h>
 #include <android/media/GetInputForAttrResponse.h>
+#include <android/media/AudioMixerAttributesInternal.h>
 
 #define VALUE_OR_RETURN_BINDER_STATUS(x) \
     ({ auto _tmp = (x); \
@@ -2538,6 +2539,84 @@
     return af->getAAudioHardwareBurstMinUsec();
 }
 
+status_t AudioSystem::getSupportedMixerAttributes(
+        audio_port_handle_t portId, std::vector<audio_mixer_attributes_t> *mixerAttrs) {
+    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
+    if (aps == nullptr) {
+        return PERMISSION_DENIED;
+    }
+
+    int32_t portIdAidl = VALUE_OR_RETURN_STATUS(legacy2aidl_audio_port_handle_t_int32_t(portId));
+    std::vector<media::AudioMixerAttributesInternal> _aidlReturn;
+    RETURN_STATUS_IF_ERROR(statusTFromBinderStatus(
+            aps->getSupportedMixerAttributes(portIdAidl, &_aidlReturn)));
+    *mixerAttrs = VALUE_OR_RETURN_STATUS(
+            convertContainer<std::vector<audio_mixer_attributes_t>>(
+                    _aidlReturn,
+                    aidl2legacy_AudioMixerAttributesInternal_audio_mixer_attributes_t));
+    return OK;
+}
+
+status_t AudioSystem::setPreferredMixerAttributes(const audio_attributes_t *attr,
+                                                  audio_port_handle_t portId,
+                                                  uid_t uid,
+                                                  const audio_mixer_attributes_t *mixerAttr) {
+    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
+    if (aps == nullptr) {
+        return PERMISSION_DENIED;
+    }
+
+    media::AudioAttributesInternal attrAidl = VALUE_OR_RETURN_STATUS(
+            legacy2aidl_audio_attributes_t_AudioAttributesInternal(*attr));
+    media::AudioMixerAttributesInternal mixerAttrAidl = VALUE_OR_RETURN_STATUS(
+            legacy2aidl_audio_mixer_attributes_t_AudioMixerAttributesInternal(*mixerAttr));
+    int32_t uidAidl = VALUE_OR_RETURN_STATUS(legacy2aidl_uid_t_int32_t(uid));
+    int32_t portIdAidl = VALUE_OR_RETURN_STATUS(legacy2aidl_audio_port_handle_t_int32_t(portId));
+
+    return statusTFromBinderStatus(
+            aps->setPreferredMixerAttributes(attrAidl, portIdAidl, uidAidl, mixerAttrAidl));
+}
+
+status_t AudioSystem::getPreferredMixerAttributes(
+        const audio_attributes_t *attr,
+        audio_port_handle_t portId,
+        std::optional<audio_mixer_attributes_t> *mixerAttr) {
+    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
+    if (aps == nullptr) {
+        return PERMISSION_DENIED;
+    }
+
+    media::AudioAttributesInternal attrAidl = VALUE_OR_RETURN_STATUS(
+            legacy2aidl_audio_attributes_t_AudioAttributesInternal(*attr));
+    int32_t portIdAidl = VALUE_OR_RETURN_STATUS(legacy2aidl_audio_port_handle_t_int32_t(portId));
+    std::optional<media::AudioMixerAttributesInternal> _aidlReturn;
+    RETURN_STATUS_IF_ERROR(statusTFromBinderStatus(
+            aps->getPreferredMixerAttributes(attrAidl, portIdAidl, &_aidlReturn)));
+
+    if (_aidlReturn.has_value()) {
+         *mixerAttr = VALUE_OR_RETURN_STATUS(
+                 aidl2legacy_AudioMixerAttributesInternal_audio_mixer_attributes_t(
+                         _aidlReturn.value()));
+    }
+    return NO_ERROR;
+}
+
+status_t AudioSystem::clearPreferredMixerAttributes(const audio_attributes_t *attr,
+                                                    audio_port_handle_t portId,
+                                                    uid_t uid) {
+    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
+    if (aps == nullptr) {
+        return PERMISSION_DENIED;
+    }
+
+    media::AudioAttributesInternal attrAidl = VALUE_OR_RETURN_STATUS(
+            legacy2aidl_audio_attributes_t_AudioAttributesInternal(*attr));
+    int32_t uidAidl = VALUE_OR_RETURN_STATUS(legacy2aidl_uid_t_int32_t(uid));
+    int32_t portIdAidl = VALUE_OR_RETURN_STATUS(legacy2aidl_audio_port_handle_t_int32_t(portId));
+    return statusTFromBinderStatus(
+            aps->clearPreferredMixerAttributes(attrAidl, portIdAidl, uidAidl));
+}
+
 // ---------------------------------------------------------------------------
 
 int AudioSystem::AudioPolicyServiceClient::addAudioPortCallback(
diff --git a/media/libaudioclient/PolicyAidlConversion.cpp b/media/libaudioclient/PolicyAidlConversion.cpp
index 4423eb6..3790000 100644
--- a/media/libaudioclient/PolicyAidlConversion.cpp
+++ b/media/libaudioclient/PolicyAidlConversion.cpp
@@ -472,4 +472,47 @@
     return unexpected(BAD_VALUE);
 }
 
+ConversionResult<audio_mixer_behavior_t>
+aidl2legacy_AudioMixerBehavior_audio_mixer_behavior_t(media::AudioMixerBehavior aidl) {
+    switch (aidl) {
+        case media::AudioMixerBehavior::DEFAULT:
+            return AUDIO_MIXER_BEHAVIOR_DEFAULT;
+        case media::AudioMixerBehavior::INVALID:
+            return AUDIO_MIXER_BEHAVIOR_INVALID;
+    }
+    return unexpected(BAD_VALUE);
+}
+ConversionResult<media::AudioMixerBehavior>
+legacy2aidl_audio_mixer_behavior_t_AudioMixerBehavior(audio_mixer_behavior_t legacy) {
+    switch (legacy) {
+        case AUDIO_MIXER_BEHAVIOR_DEFAULT:
+            return media::AudioMixerBehavior::DEFAULT;
+        case AUDIO_MIXER_BEHAVIOR_INVALID:
+            return media::AudioMixerBehavior::INVALID;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_mixer_attributes_t>
+aidl2legacy_AudioMixerAttributesInternal_audio_mixer_attributes_t(
+        const media::AudioMixerAttributesInternal& aidl) {
+    audio_mixer_attributes_t legacy = AUDIO_MIXER_ATTRIBUTES_INITIALIZER;
+    legacy.config = VALUE_OR_RETURN(
+            aidl2legacy_AudioConfigBase_audio_config_base_t(aidl.config, false /*isInput*/));
+    legacy.mixer_behavior = VALUE_OR_RETURN(
+            aidl2legacy_AudioMixerBehavior_audio_mixer_behavior_t(aidl.mixerBehavior));
+    return legacy;
+}
+ConversionResult<media::AudioMixerAttributesInternal>
+legacy2aidl_audio_mixer_attributes_t_AudioMixerAttributesInternal(
+        const audio_mixer_attributes& legacy) {
+    media::AudioMixerAttributesInternal aidl;
+    aidl.config = VALUE_OR_RETURN(
+            legacy2aidl_audio_config_base_t_AudioConfigBase(legacy.config, false /*isInput*/));
+    aidl.mixerBehavior = VALUE_OR_RETURN(
+            legacy2aidl_audio_mixer_behavior_t_AudioMixerBehavior(legacy.mixer_behavior));
+    return aidl;
+}
+
+
 }  // namespace android
diff --git a/media/libaudioclient/aidl/android/media/AudioMixerAttributesInternal.aidl b/media/libaudioclient/aidl/android/media/AudioMixerAttributesInternal.aidl
new file mode 100644
index 0000000..ed25060
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioMixerAttributesInternal.aidl
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2022 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.AudioMixerBehavior;
+import android.media.audio.common.AudioConfigBase;
+
+/**
+ * This class is used to contains information about audio mixer.
+ * The "Internal" suffix of this type name is to disambiguate it from the
+ * android.media.AudioMixerAttributes SDK type.
+ *
+ * {@hide}
+ */
+parcelable AudioMixerAttributesInternal {
+    AudioConfigBase config;
+    AudioMixerBehavior mixerBehavior;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioMixerBehavior.aidl b/media/libaudioclient/aidl/android/media/AudioMixerBehavior.aidl
new file mode 100644
index 0000000..0c0c070
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioMixerBehavior.aidl
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2022 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;
+
+/**
+ * Defines the mixer behavior that can be used when setting mixer attributes.
+ */
+@Backing(type="int")
+enum AudioMixerBehavior {
+    /**
+     * The mixer behavior is invalid.
+     */
+    INVALID = -1,
+    /**
+     * The mixer behavior that follows platform default behavior, which is mixing audio from
+     * different sources.
+     */
+    DEFAULT = 0,
+}
diff --git a/media/libaudioclient/aidl/android/media/IAudioPolicyService.aidl b/media/libaudioclient/aidl/android/media/IAudioPolicyService.aidl
index 24b59bf..e0db8f9 100644
--- a/media/libaudioclient/aidl/android/media/IAudioPolicyService.aidl
+++ b/media/libaudioclient/aidl/android/media/IAudioPolicyService.aidl
@@ -22,6 +22,7 @@
 import android.media.AudioAttributesInternal;
 import android.media.AudioDirectMode;
 import android.media.AudioMix;
+import android.media.AudioMixerAttributesInternal;
 import android.media.AudioOffloadMode;
 import android.media.AudioPatch;
 import android.media.AudioPolicyDeviceState;
@@ -391,6 +392,60 @@
      */
     AudioProfile[] getDirectProfilesForAttributes(in AudioAttributesInternal attr);
 
+    /**
+     * Return a list of AudioMixerAttributes that can be used to set preferred mixer attributes
+     * for the given device.
+     */
+    AudioMixerAttributesInternal[] getSupportedMixerAttributes(
+            int /* audio_port_handle_t */ portId);
+
+    /**
+     * Set preferred mixer attributes for a given device on a given audio attributes.
+     * When conflicting requests are received, the last request will be honored.
+     * The preferred mixer attributes can only be set when 1) the usage is media, 2) the
+     * given device is currently available, 3) the given device is usb device, 4) the given mixer
+     * attributes is supported by the given device.
+     *
+     * @param attr the audio attributes whose mixer attributes should be set.
+     * @param portId the port id of the device to be routed.
+     * @param uid the uid of the request client. The uid will be used to recognize the ownership for
+     *            the preferred mixer attributes. All the playback with same audio attributes from
+     *            the same uid will be attached to the mixer with the preferred attributes if the
+     *            playback is routed to the given device.
+     * @param mixerAttr the preferred mixer attributes.
+     */
+    void setPreferredMixerAttributes(in AudioAttributesInternal attr,
+                                     int /* audio_port_handle_t */ portId,
+                                     int /* uid_t */ uid,
+                                     in AudioMixerAttributesInternal mixerAttr);
+
+    /**
+     * Get preferred mixer attributes for a given device on a given audio attributes.
+     * Null will be returned if there is no preferred mixer attributes set or it has
+     * been cleared.
+     *
+     * @param attr the audio attributes whose mixer attributes should be set.
+     * @param portId the port id of the device to be routed.
+     */
+    @nullable AudioMixerAttributesInternal getPreferredMixerAttributes(
+            in AudioAttributesInternal attr,
+            int /* audio_port_handle_t */ portId);
+
+    /**
+     * Clear preferred mixer attributes for a given device on a given audio attributes that
+     * is previously set via setPreferredMixerAttributes.
+     *
+     * @param attr the audio attributes whose mixer attributes should be set.
+     * @param portId the port id of the device to be routed.
+     * @param uid the uid of the request client. The uid is used to identify the ownership for the
+     *            preferred mixer attributes. The preferred mixer attributes will only be cleared
+     *            if the uid is the same as the owner of current preferred mixer attributes.
+     */
+    void clearPreferredMixerAttributes(in AudioAttributesInternal attr,
+                                       int /* audio_port_handle_t */ portId,
+                                       int /* uid_t */ uid);
+
+
     // When adding a new method, please review and update
     // AudioPolicyService.cpp AudioPolicyService::onTransact()
     // AudioPolicyService.cpp IAUDIOPOLICYSERVICE_BINDER_METHOD_MACRO_LIST
diff --git a/media/libaudioclient/include/media/AudioSystem.h b/media/libaudioclient/include/media/AudioSystem.h
index a5feb3d..507802d 100644
--- a/media/libaudioclient/include/media/AudioSystem.h
+++ b/media/libaudioclient/include/media/AudioSystem.h
@@ -619,6 +619,19 @@
     static status_t getSupportedLatencyModes(audio_io_handle_t output,
             std::vector<audio_latency_mode_t>* modes);
 
+    static status_t getSupportedMixerAttributes(audio_port_handle_t portId,
+                                                std::vector<audio_mixer_attributes_t> *mixerAttrs);
+    static status_t setPreferredMixerAttributes(const audio_attributes_t *attr,
+                                                audio_port_handle_t portId,
+                                                uid_t uid,
+                                                const audio_mixer_attributes_t *mixerAttr);
+    static status_t getPreferredMixerAttributes(const audio_attributes_t* attr,
+                                                audio_port_handle_t portId,
+                                                std::optional<audio_mixer_attributes_t>* mixerAttr);
+    static status_t clearPreferredMixerAttributes(const audio_attributes_t* attr,
+                                                  audio_port_handle_t portId,
+                                                  uid_t uid);
+
     // A listener for capture state changes.
     class CaptureStateListener : public virtual RefBase {
     public:
diff --git a/media/libaudioclient/include/media/PolicyAidlConversion.h b/media/libaudioclient/include/media/PolicyAidlConversion.h
index 54e778e..ed9ddd6 100644
--- a/media/libaudioclient/include/media/PolicyAidlConversion.h
+++ b/media/libaudioclient/include/media/PolicyAidlConversion.h
@@ -22,6 +22,8 @@
 #include <system/audio.h>
 
 #include <android/media/AudioMix.h>
+#include <android/media/AudioMixerAttributesInternal.h>
+#include <android/media/AudioMixerBehavior.h>
 #include <android/media/AudioMixCallbackFlag.h>
 #include <android/media/AudioMixRouteFlag.h>
 #include <android/media/AudioMixType.h>
@@ -102,4 +104,16 @@
 ConversionResult<media::AudioOffloadMode>
 legacy2aidl_audio_offload_mode_t_AudioOffloadMode(audio_offload_mode_t legacy);
 
+ConversionResult<audio_mixer_behavior_t>
+aidl2legacy_AudioMixerBehavior_audio_mixer_behavior_t(media::AudioMixerBehavior aidl);
+ConversionResult<media::AudioMixerBehavior>
+legacy2aidl_audio_mixer_behavior_t_AudioMixerBehavior(audio_mixer_behavior_t legacy);
+
+ConversionResult<audio_mixer_attributes_t>
+aidl2legacy_AudioMixerAttributesInternal_audio_mixer_attributes_t(
+        const media::AudioMixerAttributesInternal& aidl);
+ConversionResult<media::AudioMixerAttributesInternal>
+legacy2aidl_audio_mixer_attributes_t_AudioMixerAttributesInternal(
+        const audio_mixer_attributes_t& legacy);
+
 }  // namespace android
diff --git a/media/libaudiofoundation/include/media/AudioContainers.h b/media/libaudiofoundation/include/media/AudioContainers.h
index b6e6c84..bce131c 100644
--- a/media/libaudiofoundation/include/media/AudioContainers.h
+++ b/media/libaudiofoundation/include/media/AudioContainers.h
@@ -31,6 +31,7 @@
 using DeviceTypeSet = std::set<audio_devices_t>;
 using FormatSet = std::set<audio_format_t>;
 using SampleRateSet = std::set<uint32_t>;
+using MixerBehaviorSet = std::set<audio_mixer_behavior_t>;
 
 using FormatVector = std::vector<audio_format_t>;
 
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index acbbe48..e06d2cd 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2732,7 +2732,11 @@
             }
             // abort if start is rejected by audio policy manager
             if (status != NO_ERROR) {
-                return PERMISSION_DENIED;
+                // Do not replace the error if it is DEAD_OBJECT. When this happens, it indicates
+                // current playback thread is reopened, which may happen when clients set preferred
+                // mixer configuration. Returning DEAD_OBJECT will make the client restore track
+                // immediately.
+                return status == DEAD_OBJECT ? status : PERMISSION_DENIED;
             }
 #ifdef ADD_BATTERY_DATA
             // to track the speaker usage
diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 5d6caba..6493e2a 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -1116,10 +1116,10 @@
             mObservedUnderruns = playbackThread->getFastTrackUnderruns(mFastIndex);
         }
         status = playbackThread->addTrack_l(this);
-        if (status == INVALID_OPERATION || status == PERMISSION_DENIED) {
+        if (status == INVALID_OPERATION || status == PERMISSION_DENIED || status == DEAD_OBJECT) {
             triggerEvents(AudioSystem::SYNC_EVENT_PRESENTATION_COMPLETE);
             //  restore previous state if start was rejected by policy manager
-            if (status == PERMISSION_DENIED) {
+            if (status == PERMISSION_DENIED || status == DEAD_OBJECT) {
                 mState = state;
             }
         }
diff --git a/services/audiopolicy/AudioPolicyInterface.h b/services/audiopolicy/AudioPolicyInterface.h
index b85382e..9c4ab80 100644
--- a/services/audiopolicy/AudioPolicyInterface.h
+++ b/services/audiopolicy/AudioPolicyInterface.h
@@ -407,6 +407,20 @@
     // retrieves the list of available direct audio profiles for the given audio attributes
     virtual status_t getDirectProfilesForAttributes(const audio_attributes_t* attr,
                                                     AudioProfileVector& audioProfiles) = 0;
+
+    virtual status_t getSupportedMixerAttributes(
+            audio_port_handle_t portId, std::vector<audio_mixer_attributes_t>& mixerAttrs) = 0;
+    virtual status_t setPreferredMixerAttributes(
+            const audio_attributes_t* attr,
+            audio_port_handle_t portId,
+            uid_t uid,
+            const audio_mixer_attributes_t* mixerAttributes) = 0;
+    virtual status_t getPreferredMixerAttributes(const audio_attributes_t* attr,
+                                                 audio_port_handle_t portId,
+                                                 audio_mixer_attributes_t* mixerAttributes) = 0;
+    virtual status_t clearPreferredMixerAttributes(const audio_attributes_t* attr,
+                                                   audio_port_handle_t portId,
+                                                   uid_t uid) = 0;
 };
 
 // Audio Policy client Interface
diff --git a/services/audiopolicy/common/include/policy.h b/services/audiopolicy/common/include/policy.h
index 3d3e0cf..de8e77f 100644
--- a/services/audiopolicy/common/include/policy.h
+++ b/services/audiopolicy/common/include/policy.h
@@ -246,3 +246,16 @@
         }
     }
 }
+
+/**
+ * Indicates if two given audio output flags are considered as matched, which means that
+ * 1) the `supersetFlags` and `subsetFlags` both contain or both don't contain must match flags and
+ * 2) `supersetFlags` contains all flags from `subsetFlags`.
+ */
+static inline bool audio_output_flags_is_subset(audio_output_flags_t supersetFlags,
+                                                audio_output_flags_t subsetFlags,
+                                                uint32_t mustMatchFlags)
+{
+    return ((supersetFlags ^ subsetFlags) & mustMatchFlags) == AUDIO_OUTPUT_FLAG_NONE
+            && (supersetFlags & subsetFlags) == subsetFlags;
+}
diff --git a/services/audiopolicy/common/managerdefinitions/Android.bp b/services/audiopolicy/common/managerdefinitions/Android.bp
index 1f23ae3..92a5628 100644
--- a/services/audiopolicy/common/managerdefinitions/Android.bp
+++ b/services/audiopolicy/common/managerdefinitions/Android.bp
@@ -24,6 +24,7 @@
         "src/HwModule.cpp",
         "src/IOProfile.cpp",
         "src/PolicyAudioPort.cpp",
+        "src/PreferredMixerAttributesInfo.cpp",
         "src/Serializer.cpp",
         "src/SoundTriggerSession.cpp",
         "src/TypeConverter.cpp",
diff --git a/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h b/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h
index 75fa595..9bece23 100644
--- a/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h
+++ b/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h
@@ -440,6 +440,8 @@
 
     void setTracksInvalidatedStatusByStrategy(product_strategy_t strategy);
 
+    bool isConfigurationMatched(const audio_config_base_t& config, audio_output_flags_t flags);
+
     const sp<IOProfile> mProfile;          // I/O profile this output derives from
     audio_io_handle_t mIoHandle;           // output handle
     uint32_t mLatency;                  //
diff --git a/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h b/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
index 4adc920..80e098b 100644
--- a/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
+++ b/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
@@ -183,6 +183,10 @@
         return isSingleDeviceType(mDeviceTypes, deviceType);
     }
 
+    bool onlyContainsDevice(const sp<DeviceDescriptor>& item) const {
+        return this->size() == 1 && contains(item);
+    }
+
     bool contains(const sp<DeviceDescriptor>& item) const { return indexOf(item) >= 0; }
 
     /**
diff --git a/services/audiopolicy/common/managerdefinitions/include/IOProfile.h b/services/audiopolicy/common/managerdefinitions/include/IOProfile.h
index 37443ab..084399d 100644
--- a/services/audiopolicy/common/managerdefinitions/include/IOProfile.h
+++ b/services/audiopolicy/common/managerdefinitions/include/IOProfile.h
@@ -35,10 +35,7 @@
 class IOProfile : public AudioPort, public PolicyAudioPort
 {
 public:
-    IOProfile(const std::string &name, audio_port_role_t role)
-        : AudioPort(name, AUDIO_PORT_TYPE_MIX, role),
-          curOpenCount(0),
-          curActiveCount(0) {}
+    IOProfile(const std::string &name, audio_port_role_t role);
 
     virtual ~IOProfile() = default;
 
@@ -66,6 +63,14 @@
         if (getRole() == AUDIO_PORT_ROLE_SINK && (flags & AUDIO_INPUT_FLAG_MMAP_NOIRQ) != 0) {
             maxActiveCount = 0;
         }
+        if (getRole() == AUDIO_PORT_ROLE_SOURCE) {
+            mMixerBehaviors.clear();
+            mMixerBehaviors.insert(AUDIO_MIXER_BEHAVIOR_DEFAULT);
+        }
+    }
+
+    const MixerBehaviorSet& getMixerBehaviors() const {
+        return mMixerBehaviors;
     }
 
     /**
@@ -212,6 +217,8 @@
         return false;
     }
 
+    void toSupportedMixerAttributes(std::vector<audio_mixer_attributes_t>* mixerAttributes) const;
+
     // Number of streams currently opened for this profile.
     uint32_t     curOpenCount;
     // Number of streams currently active for this profile. This is not the number of active clients
@@ -220,6 +227,8 @@
 
 private:
     DeviceVector mSupportedDevices; // supported devices: this input/output can be routed from/to
+
+    MixerBehaviorSet mMixerBehaviors;
 };
 
 class InputProfile : public IOProfile
diff --git a/services/audiopolicy/common/managerdefinitions/include/PreferredMixerAttributesInfo.h b/services/audiopolicy/common/managerdefinitions/include/PreferredMixerAttributesInfo.h
new file mode 100644
index 0000000..9472481
--- /dev/null
+++ b/services/audiopolicy/common/managerdefinitions/include/PreferredMixerAttributesInfo.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#pragma once
+
+#include <map>
+
+#include <utils/RefBase.h>
+
+#include "AudioRoute.h"
+#include "HwModule.h"
+#include "IOProfile.h"
+
+namespace android {
+
+class PreferredMixerAttributesInfo : public RefBase {
+public:
+    PreferredMixerAttributesInfo(uid_t uid, audio_port_handle_t devicePortId,
+                                 const sp<IOProfile>& profile, audio_output_flags_t flags,
+                                 const audio_mixer_attributes_t& mixerAttributes)
+        : mDevicePortId(devicePortId), mUid(uid), mProfile(profile),
+          mOutputFlags(flags), mMixerAttributes(mixerAttributes) { }
+
+    audio_port_handle_t getDeviceId() const { return mDevicePortId; }
+    const audio_config_base_t& getConfigBase() const { return mMixerAttributes.config; }
+    uid_t getUid() const { return mUid; }
+    int getActiveClientCount() const { return mActiveClientsCount; }
+    const sp<IOProfile> getProfile() const { return mProfile; };
+    audio_output_flags_t getFlags() const { return mOutputFlags; }
+    const audio_mixer_attributes_t& getMixerAttributes() const { return mMixerAttributes; }
+
+    void increaseActiveClient() { mActiveClientsCount++; }
+    void decreaseActiveClient() { mActiveClientsCount--; }
+
+    void dump(String8 *dst);
+
+private:
+    const audio_port_handle_t mDevicePortId;
+    const uid_t mUid;
+    const sp<IOProfile> mProfile;
+    const audio_output_flags_t mOutputFlags;
+    const audio_mixer_attributes_t mMixerAttributes;
+    int mActiveClientsCount = 0;
+};
+
+} // namespace android
\ No newline at end of file
diff --git a/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp b/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp
index 8eefe77..0b3ba4d 100644
--- a/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp
@@ -26,6 +26,7 @@
 #include "Volume.h"
 #include "HwModule.h"
 #include "TypeConverter.h"
+#include "policy.h"
 #include <media/AudioGain.h>
 #include <media/AudioParameter.h>
 #include <media/AudioPolicy.h>
@@ -311,6 +312,9 @@
     if (extraInfo != nullptr) {
         allExtraInfo.appendFormat("%s; ", extraInfo);
     }
+    if (mProfile != nullptr) {
+        allExtraInfo.appendFormat("IOProfile name:%s; ", mProfile->getName().c_str());
+    }
     std::string flagsLiteral = toString(mFlags);
     allExtraInfo.appendFormat("Latency: %d; 0x%04x", mLatency, mFlags);
     if (!flagsLiteral.empty()) {
@@ -931,6 +935,16 @@
     return false;
 }
 
+bool SwAudioOutputDescriptor::isConfigurationMatched(const audio_config_base_t &config,
+                                                     audio_output_flags_t flags) {
+    const uint32_t mustMatchOutputFlags =
+            AUDIO_OUTPUT_FLAG_DIRECT|AUDIO_OUTPUT_FLAG_HW_AV_SYNC|AUDIO_OUTPUT_FLAG_MMAP_NOIRQ;
+    return audio_output_flags_is_subset(AudioOutputDescriptor::mFlags, flags, mustMatchOutputFlags)
+            && mSamplingRate == config.sample_rate
+            && mChannelMask == config.channel_mask
+            && mFormat == config.format;
+}
+
 void SwAudioOutputCollection::dump(String8 *dst) const
 {
     dst->appendFormat("\n Outputs (%zu):\n", size());
diff --git a/services/audiopolicy/common/managerdefinitions/src/IOProfile.cpp b/services/audiopolicy/common/managerdefinitions/src/IOProfile.cpp
index 7b4cecf..98d7d59 100644
--- a/services/audiopolicy/common/managerdefinitions/src/IOProfile.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/IOProfile.cpp
@@ -24,6 +24,15 @@
 
 namespace android {
 
+IOProfile::IOProfile(const std::string &name, audio_port_role_t role)
+        : AudioPort(name, AUDIO_PORT_TYPE_MIX, role),
+          curOpenCount(0),
+          curActiveCount(0) {
+    if (role == AUDIO_PORT_ROLE_SOURCE) {
+        mMixerBehaviors.insert(AUDIO_MIXER_BEHAVIOR_DEFAULT);
+    }
+}
+
 bool IOProfile::isCompatibleProfile(const DeviceVector &devices,
                                     uint32_t samplingRate,
                                     uint32_t *updatedSamplingRate,
@@ -105,8 +114,10 @@
 
     const uint32_t mustMatchOutputFlags =
             AUDIO_OUTPUT_FLAG_DIRECT|AUDIO_OUTPUT_FLAG_HW_AV_SYNC|AUDIO_OUTPUT_FLAG_MMAP_NOIRQ;
-    if (isPlaybackThread && (((getFlags() ^ flags) & mustMatchOutputFlags)
-                    || (getFlags() & flags) != flags)) {
+    if (isPlaybackThread &&
+        !audio_output_flags_is_subset((audio_output_flags_t)getFlags(),
+                                      (audio_output_flags_t)flags,
+                                      mustMatchOutputFlags)) {
         return false;
     }
     // The only input flag that is allowed to be different is the fast flag.
@@ -132,6 +143,34 @@
                 return device == deviceDesc && deviceDesc->hasCurrentEncodedFormat(); }) == 1;
 }
 
+void IOProfile::toSupportedMixerAttributes(
+        std::vector<audio_mixer_attributes_t> *mixerAttributes) const {
+    if (!hasDynamicAudioProfile()) {
+        // The mixer attributes is only supported when there is a dynamic profile.
+        return;
+    }
+    for (const auto& profile : mProfiles) {
+        if (!profile->isValid()) {
+            continue;
+        }
+        for (const auto sampleRate : profile->getSampleRates()) {
+            for (const auto channelMask : profile->getChannels()) {
+                const audio_config_base_t config = {
+                        .format = profile->getFormat(),
+                        .sample_rate = sampleRate,
+                        .channel_mask = channelMask
+                };
+                for (const auto mixerBehavior : mMixerBehaviors) {
+                    mixerAttributes->push_back({
+                        .config = config,
+                        .mixer_behavior = mixerBehavior
+                    });
+                }
+            }
+        }
+    }
+}
+
 void IOProfile::dump(String8 *dst, int spaces) const
 {
     String8 extraInfo;
diff --git a/services/audiopolicy/common/managerdefinitions/src/PreferredMixerAttributesInfo.cpp b/services/audiopolicy/common/managerdefinitions/src/PreferredMixerAttributesInfo.cpp
new file mode 100644
index 0000000..edb2c6d
--- /dev/null
+++ b/services/audiopolicy/common/managerdefinitions/src/PreferredMixerAttributesInfo.cpp
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2022 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 "PreferredMixerAttributesInfo.h"
+
+namespace android {
+
+void PreferredMixerAttributesInfo::dump(String8 *dst) {
+    dst->appendFormat("device port ID: %d; owner uid: %d; profile name: %s; flags: %#x; "
+                      "sample rate: %u; channel mask: %#x; format: %#x; mixer behavior: %d; "
+                      "active clients count: %d\n",
+                      mDevicePortId, mUid, mProfile->getName().c_str(), mOutputFlags,
+                      mMixerAttributes.config.sample_rate, mMixerAttributes.config.channel_mask,
+                      mMixerAttributes.config.format, mMixerAttributes.mixer_behavior,
+                      mActiveClientsCount);
+}
+
+} // namespace android
\ No newline at end of file
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 4c8aec7..959dd4f 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -260,6 +260,9 @@
             // remove device from mReportedFormatsMap cache
             mReportedFormatsMap.erase(device);
 
+            // remove preferred mixer configurations
+            mPreferredMixerAttrInfos.erase(device->getId());
+
             } break;
 
         default:
@@ -1270,8 +1273,19 @@
         }
     }
     if (*output == AUDIO_IO_HANDLE_NONE) {
+        sp<PreferredMixerAttributesInfo> info = nullptr;
+        if (outputDevices.size() == 1) {
+            info = getPreferredMixerAttributesInfo(
+                    outputDevices.itemAt(0)->getId(),
+                    mEngine->getProductStrategyForAttributes(*resultAttr));
+            if (info != nullptr && info->getUid() != uid && info->getActiveClientCount() == 0) {
+                // Only use preferred mixer when the requested uid matched or
+                // there is active client on preferred mixer.
+                info = nullptr;
+            }
+        }
         *output = getOutputForDevices(outputDevices, session, resultAttr, config,
-                flags, isSpatialized, resultAttr->flags & AUDIO_FLAG_MUTE_HAPTIC);
+                flags, isSpatialized, info, resultAttr->flags & AUDIO_FLAG_MUTE_HAPTIC);
     }
     if (*output == AUDIO_IO_HANDLE_NONE) {
         AudioProfileVector profiles;
@@ -1482,6 +1496,7 @@
         const audio_config_t *config,
         audio_output_flags_t *flags,
         bool *isSpatialized,
+        sp<PreferredMixerAttributesInfo> prefMixerConfigInfo,
         bool forceMutingHaptic)
 {
     audio_io_handle_t output = AUDIO_IO_HANDLE_NONE;
@@ -1557,11 +1572,36 @@
         // get which output is suitable for the specified stream. The actual
         // routing change will happen when startOutput() will be called
         SortedVector<audio_io_handle_t> outputs = getOutputsForDevices(devices, mOutputs);
-
-        // at this stage we should ignore the DIRECT flag as no direct output could be found earlier
-        *flags = (audio_output_flags_t)(*flags & ~AUDIO_OUTPUT_FLAG_DIRECT);
-        output = selectOutput(
-                outputs, *flags, config->format, channelMask, config->sample_rate, session);
+        if (prefMixerConfigInfo != nullptr) {
+            for (audio_io_handle_t outputHandle : outputs) {
+                sp<SwAudioOutputDescriptor> outputDesc = mOutputs.valueFor(outputHandle);
+                if (outputDesc->mProfile == prefMixerConfigInfo->getProfile()) {
+                    output = outputHandle;
+                    break;
+                }
+            }
+            if (output == AUDIO_IO_HANDLE_NONE) {
+                // No output open with the preferred profile. Open a new one.
+                audio_config_t config = AUDIO_CONFIG_INITIALIZER;
+                config.channel_mask = prefMixerConfigInfo->getConfigBase().channel_mask;
+                config.sample_rate = prefMixerConfigInfo->getConfigBase().sample_rate;
+                config.format = prefMixerConfigInfo->getConfigBase().format;
+                sp<SwAudioOutputDescriptor> preferredOutput = openOutputWithProfileAndDevice(
+                        prefMixerConfigInfo->getProfile(), devices, nullptr /*mixerConfig*/,
+                        &config, prefMixerConfigInfo->getFlags());
+                if (preferredOutput == nullptr) {
+                    ALOGE("%s failed to open output with preferred mixer config", __func__);
+                } else {
+                    output = preferredOutput->mIoHandle;
+                }
+            }
+        } else {
+            // at this stage we should ignore the DIRECT flag as no direct output could be
+            // found earlier
+            *flags = (audio_output_flags_t) (*flags & ~AUDIO_OUTPUT_FLAG_DIRECT);
+            output = selectOutput(
+                    outputs, *flags, config->format, channelMask, config->sample_rate, session);
+        }
     }
     ALOGW_IF((output == 0), "getOutputForDevices() could not find output for stream %d, "
             "sampling rate %d, format %#x, channels %#x, flags %#x",
@@ -2015,6 +2055,33 @@
         outputDesc->stop();
         return status;
     }
+
+    // If the client is the first one active on preferred mixer parameters, reopen the output
+    // if the current mixer parameters doesn't match the preferred one.
+    if (outputDesc->devices().size() == 1) {
+        sp<PreferredMixerAttributesInfo> info = getPreferredMixerAttributesInfo(
+                outputDesc->devices()[0]->getId(), client->strategy());
+        if (info != nullptr && info->getUid() == client->uid()) {
+            if (info->getActiveClientCount() == 0 && !outputDesc->isConfigurationMatched(
+                    info->getConfigBase(), info->getFlags())) {
+                stopSource(outputDesc, client);
+                outputDesc->stop();
+                audio_config_t config = AUDIO_CONFIG_INITIALIZER;
+                config.channel_mask = info->getConfigBase().channel_mask;
+                config.sample_rate = info->getConfigBase().sample_rate;
+                config.format = info->getConfigBase().format;
+                status_t status = reopenOutput(outputDesc, &config, info->getFlags(), __func__);
+                if (status != NO_ERROR) {
+                    return status;
+                }
+                // Intentionally return error to let the client side resending request for
+                // creating and starting.
+                return DEAD_OBJECT;
+            }
+            info->increaseActiveClient();
+        }
+    }
+
     if (delayMs != 0) {
         usleep(delayMs * 1000);
     }
@@ -2267,6 +2334,19 @@
 
     if (status == NO_ERROR ) {
         outputDesc->stop();
+    } else {
+        return status;
+    }
+
+    if (outputDesc->devices().size() == 1) {
+        sp<PreferredMixerAttributesInfo> info = getPreferredMixerAttributesInfo(
+                outputDesc->devices()[0]->getId(), client->strategy());
+        if (info != nullptr && info->getUid() == client->uid()) {
+            info->decreaseActiveClient();
+            if (info->getActiveClientCount() == 0) {
+                reopenOutput(outputDesc, nullptr /*config*/, AUDIO_OUTPUT_FLAG_NONE, __func__);
+            }
+        }
     }
     return status;
 }
@@ -3892,6 +3972,15 @@
         dst->appendFormat("   - uid=%d flag_mask=%#x\n", policy.first, policy.second);
     }
 
+    dst->appendFormat(" Preferred mixer audio configuration:\n");
+    for (const auto it : mPreferredMixerAttrInfos) {
+        dst->appendFormat("   - device port id: %d\n", it.first);
+        for (const auto preferredMixerInfoIt : it.second) {
+            dst->appendFormat("     - strategy: %d; ", preferredMixerInfoIt.first);
+            preferredMixerInfoIt.second->dump(dst);
+        }
+    }
+
     dst->appendFormat("\nPolicy Engine dump:\n");
     mEngine->dump(dst);
 }
@@ -4122,6 +4211,172 @@
                                  AUDIO_OUTPUT_FLAG_DIRECT /*flags*/, false /*isInput*/);
 }
 
+status_t AudioPolicyManager::getSupportedMixerAttributes(
+        audio_port_handle_t portId, std::vector<audio_mixer_attributes_t> &mixerAttrs) {
+    ALOGV("%s, portId=%d", __func__, portId);
+    sp<DeviceDescriptor> deviceDescriptor = mAvailableOutputDevices.getDeviceFromId(portId);
+    if (deviceDescriptor == nullptr) {
+        ALOGE("%s the requested device is currently unavailable", __func__);
+        return BAD_VALUE;
+    }
+    for (const auto& hwModule : mHwModules) {
+        for (const auto& curProfile : hwModule->getOutputProfiles()) {
+            if (curProfile->supportsDevice(deviceDescriptor)) {
+                curProfile->toSupportedMixerAttributes(&mixerAttrs);
+            }
+        }
+    }
+    return NO_ERROR;
+}
+
+status_t AudioPolicyManager::setPreferredMixerAttributes(
+        const audio_attributes_t *attr,
+        audio_port_handle_t portId,
+        uid_t uid,
+        const audio_mixer_attributes_t *mixerAttributes) {
+    ALOGV("%s, attr=%s, mixerAttributes={format=%#x, channelMask=%#x, samplingRate=%u, "
+          "mixerBehavior=%d}, uid=%d, portId=%u",
+          __func__, toString(*attr).c_str(), mixerAttributes->config.format,
+          mixerAttributes->config.channel_mask, mixerAttributes->config.sample_rate,
+          mixerAttributes->mixer_behavior, uid, portId);
+    if (attr->usage != AUDIO_USAGE_MEDIA) {
+        ALOGE("%s failed, only media is allowed, the given usage is %d", __func__, attr->usage);
+        return BAD_VALUE;
+    }
+    sp<DeviceDescriptor> deviceDescriptor = mAvailableOutputDevices.getDeviceFromId(portId);
+    if (deviceDescriptor == nullptr) {
+        ALOGE("%s the requested device is currently unavailable", __func__);
+        return BAD_VALUE;
+    }
+    if (!audio_is_usb_out_device(deviceDescriptor->type())) {
+        ALOGE("%s(%d), type=%d, is not a usb output device",
+              __func__, portId, deviceDescriptor->type());
+        return BAD_VALUE;
+    }
+
+    audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE;
+    audio_flags_to_audio_output_flags(attr->flags, &flags);
+    flags = (audio_output_flags_t) (flags |
+            audio_output_flags_from_mixer_behavior(mixerAttributes->mixer_behavior));
+    sp<IOProfile> profile = nullptr;
+    DeviceVector devices(deviceDescriptor);
+    for (const auto& hwModule : mHwModules) {
+        for (const auto& curProfile : hwModule->getOutputProfiles()) {
+            if (curProfile->hasDynamicAudioProfile()
+                    && curProfile->isCompatibleProfile(devices,
+                                                       mixerAttributes->config.sample_rate,
+                                                       nullptr /*updatedSamplingRate*/,
+                                                       mixerAttributes->config.format,
+                                                       nullptr /*updatedFormat*/,
+                                                       mixerAttributes->config.channel_mask,
+                                                       nullptr /*updatedChannelMask*/,
+                                                       flags,
+                                                       false /*exactMatchRequiredForInputFlags*/)) {
+                profile = curProfile;
+                break;
+            }
+        }
+    }
+    if (profile == nullptr) {
+        ALOGE("%s, there is no compatible profile found", __func__);
+        return BAD_VALUE;
+    }
+
+    sp<PreferredMixerAttributesInfo> mixerAttrInfo =
+            sp<PreferredMixerAttributesInfo>::make(
+                    uid, portId, profile, flags, *mixerAttributes);
+    const product_strategy_t strategy = mEngine->getProductStrategyForAttributes(*attr);
+    mPreferredMixerAttrInfos[portId][strategy] = mixerAttrInfo;
+
+    // If 1) there is any client from the preferred mixer configuration owner that is currently
+    // active and matches the strategy and 2) current output is on the preferred device and the
+    // mixer configuration doesn't match the preferred one, reopen output with preferred mixer
+    // configuration.
+    std::vector<audio_io_handle_t> outputsToReopen;
+    for (size_t i = 0; i < mOutputs.size(); i++) {
+        const auto output = mOutputs.valueAt(i);
+        if (output->mProfile == profile && output->devices().onlyContainsDevice(deviceDescriptor)
+            && !output->isConfigurationMatched(mixerAttributes->config, flags)) {
+            for (const auto& client : output->getActiveClients()) {
+                if (client->uid() == uid && client->strategy() == strategy) {
+                    client->setIsInvalid();
+                    outputsToReopen.push_back(output->mIoHandle);
+                }
+            }
+        }
+    }
+    audio_config_t config = AUDIO_CONFIG_INITIALIZER;
+    config.sample_rate = mixerAttributes->config.sample_rate;
+    config.channel_mask = mixerAttributes->config.channel_mask;
+    config.format = mixerAttributes->config.format;
+    for (const auto output : outputsToReopen) {
+        reopenOutput(mOutputs.valueFor(output), &config, flags, __func__);
+    }
+
+    return NO_ERROR;
+}
+
+sp<PreferredMixerAttributesInfo> AudioPolicyManager::getPreferredMixerAttributesInfo(
+        audio_port_handle_t devicePortId, product_strategy_t strategy) {
+    auto it = mPreferredMixerAttrInfos.find(devicePortId);
+    if (it == mPreferredMixerAttrInfos.end()) {
+        return nullptr;
+    }
+    auto mixerAttrInfoIt = it->second.find(strategy);
+    if (mixerAttrInfoIt == it->second.end()) {
+        return nullptr;
+    }
+    return mixerAttrInfoIt->second;
+}
+
+status_t AudioPolicyManager::getPreferredMixerAttributes(
+        const audio_attributes_t *attr,
+        audio_port_handle_t portId,
+        audio_mixer_attributes_t* mixerAttributes) {
+    sp<PreferredMixerAttributesInfo> info = getPreferredMixerAttributesInfo(
+            portId, mEngine->getProductStrategyForAttributes(*attr));
+    if (info == nullptr) {
+        return NAME_NOT_FOUND;
+    }
+    *mixerAttributes = info->getMixerAttributes();
+    return NO_ERROR;
+}
+
+status_t AudioPolicyManager::clearPreferredMixerAttributes(const audio_attributes_t *attr,
+                                                           audio_port_handle_t portId,
+                                                           uid_t uid) {
+    const product_strategy_t strategy = mEngine->getProductStrategyForAttributes(*attr);
+    const auto preferredMixerAttrInfo = getPreferredMixerAttributesInfo(portId, strategy);
+    if (preferredMixerAttrInfo == nullptr) {
+        return NAME_NOT_FOUND;
+    }
+    if (preferredMixerAttrInfo->getUid() != uid) {
+        ALOGE("%s, requested uid=%d, owned uid=%d",
+              __func__, uid, preferredMixerAttrInfo->getUid());
+        return PERMISSION_DENIED;
+    }
+    mPreferredMixerAttrInfos[portId].erase(strategy);
+    if (mPreferredMixerAttrInfos[portId].empty()) {
+        mPreferredMixerAttrInfos.erase(portId);
+    }
+
+    // Reconfig existing output
+    std::vector<audio_io_handle_t> potentialOutputsToReopen;
+    for (size_t i = 0; i < mOutputs.size(); i++) {
+        if (mOutputs.valueAt(i)->mProfile == preferredMixerAttrInfo->getProfile()) {
+            potentialOutputsToReopen.push_back(mOutputs.keyAt(i));
+        }
+    }
+    for (const auto output : potentialOutputsToReopen) {
+        sp<SwAudioOutputDescriptor> desc = mOutputs.valueFor(output);
+        if (desc->isConfigurationMatched(preferredMixerAttrInfo->getConfigBase(),
+                                         preferredMixerAttrInfo->getFlags())) {
+            reopenOutput(desc, nullptr /*config*/, AUDIO_OUTPUT_FLAG_NONE, __func__);
+        }
+    }
+    return NO_ERROR;
+}
+
 status_t AudioPolicyManager::listAudioPorts(audio_port_role_t role,
                                             audio_port_type_t type,
                                             unsigned int *num_ports,
@@ -4186,6 +4441,7 @@
             *num_ports += numOutputs;
         }
     }
+
     *generation = curAudioPortGeneration();
     ALOGV("listAudioPorts() got %zu ports needed %d", portsWritten, *num_ports);
     return NO_ERROR;
@@ -7744,19 +8000,23 @@
 
 sp<SwAudioOutputDescriptor> AudioPolicyManager::openOutputWithProfileAndDevice(
         const sp<IOProfile>& profile, const DeviceVector& devices,
-        const audio_config_base_t *mixerConfig)
+        const audio_config_base_t *mixerConfig, const audio_config_t *halConfig,
+        audio_output_flags_t flags)
 {
     for (const auto& device : devices) {
         // TODO: This should be checking if the profile supports the device combo.
         if (!profile->supportsDevice(device)) {
+            ALOGE("%s profile(%s) doesn't support device %#x", __func__, profile->getName().c_str(),
+                  device->type());
             return nullptr;
         }
     }
     sp<SwAudioOutputDescriptor> desc = new SwAudioOutputDescriptor(profile, mpClientInterface);
     audio_io_handle_t output = AUDIO_IO_HANDLE_NONE;
-    status_t status = desc->open(nullptr /* halConfig */, mixerConfig, devices,
-            AUDIO_STREAM_DEFAULT, AUDIO_OUTPUT_FLAG_NONE, &output);
+    status_t status = desc->open(halConfig, mixerConfig, devices,
+            AUDIO_STREAM_DEFAULT, flags, &output);
     if (status != NO_ERROR) {
+        ALOGE("%s failed to open output %d", __func__, status);
         return nullptr;
     }
 
@@ -7774,7 +8034,9 @@
         ALOGW("%s() missing param", __func__);
         desc->close();
         return nullptr;
-    } else if (profile->hasDynamicAudioProfile()) {
+    } else if (profile->hasDynamicAudioProfile() && halConfig == nullptr) {
+        // Reopen the output with the best audio profile picked by APM when the profile supports
+        // dynamic audio profile and the hal config is not specified.
         desc->close();
         output = AUDIO_IO_HANDLE_NONE;
         audio_config_t config = AUDIO_CONFIG_INITIALIZER;
@@ -7784,8 +8046,7 @@
         config.offload_info.channel_mask = config.channel_mask;
         config.offload_info.format = config.format;
 
-        status = desc->open(&config, mixerConfig, devices,
-                            AUDIO_STREAM_DEFAULT, AUDIO_OUTPUT_FLAG_NONE, &output);
+        status = desc->open(&config, mixerConfig, devices, AUDIO_STREAM_DEFAULT, flags, &output);
         if (status != NO_ERROR) {
             return nullptr;
         }
@@ -7945,4 +8206,19 @@
     return NO_ERROR;
 }
 
+status_t AudioPolicyManager::reopenOutput(sp<SwAudioOutputDescriptor> outputDesc,
+                                          const audio_config_t *config,
+                                          audio_output_flags_t flags,
+                                          const char* caller) {
+    closeOutput(outputDesc->mIoHandle);
+    sp<SwAudioOutputDescriptor> preferredOutput = openOutputWithProfileAndDevice(
+            outputDesc->mProfile, outputDesc->devices(), nullptr /*mixerConfig*/, config, flags);
+    if (preferredOutput == nullptr) {
+        ALOGE("%s failed to reopen output device=%d, caller=%s",
+              __func__, outputDesc->devices()[0]->getId(), caller);
+        return BAD_VALUE;
+    }
+    return NO_ERROR;
+}
+
 } // namespace android
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.h b/services/audiopolicy/managerdefault/AudioPolicyManager.h
index a3600a0..b7a55e9 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.h
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.h
@@ -47,6 +47,7 @@
 #include <AudioOutputDescriptor.h>
 #include <AudioPolicyMix.h>
 #include <EffectDescriptor.h>
+#include <PreferredMixerAttributesInfo.h>
 #include <SoundTriggerSession.h>
 #include "EngineLibrary.h"
 #include "TypeConverter.h"
@@ -395,6 +396,21 @@
         virtual status_t getDirectProfilesForAttributes(const audio_attributes_t* attr,
                                                          AudioProfileVector& audioProfiles);
 
+        status_t getSupportedMixerAttributes(
+                audio_port_handle_t portId,
+                std::vector<audio_mixer_attributes_t>& mixerAttrs) override;
+        status_t setPreferredMixerAttributes(
+                const audio_attributes_t* attr,
+                audio_port_handle_t portId,
+                uid_t uid,
+                const audio_mixer_attributes_t* mixerAttributes) override;
+        status_t getPreferredMixerAttributes(const audio_attributes_t* attr,
+                                             audio_port_handle_t portId,
+                                             audio_mixer_attributes_t* mixerAttributes) override;
+        status_t clearPreferredMixerAttributes(const audio_attributes_t* attr,
+                                               audio_port_handle_t portId,
+                                               uid_t uid) override;
+
         bool isCallScreenModeSupported() override;
 
         void onNewAudioModulesAvailable() override;
@@ -983,6 +999,10 @@
         sp<SourceClientDescriptor> mCallRxSourceClient;
         sp<SourceClientDescriptor> mCallTxSourceClient;
 
+        std::map<audio_port_handle_t,
+                 std::map<product_strategy_t,
+                          sp<PreferredMixerAttributesInfo>>> mPreferredMixerAttrInfos;
+
         // Support for Multi-Stream Decoder (MSD) module
         sp<DeviceDescriptor> getMsdAudioInDevice() const;
         DeviceVector getMsdAudioOutDevices() const;
@@ -1069,6 +1089,7 @@
                 const audio_config_t *config,
                 audio_output_flags_t *flags,
                 bool *isSpatialized,
+                sp<PreferredMixerAttributesInfo> prefMixerAttrInfo = nullptr,
                 bool forceMutingHaptic = false);
 
         // Internal method checking if a direct output can be opened matching the requested
@@ -1236,11 +1257,15 @@
          * @param[in] profile IOProfile to use as template
          * @param[in] devices initial route to apply to this output stream
          * @param[in] mixerConfig if not null, use this to configure the mixer
+         * @param[in] halConfig if not null, use this to configure the HAL
+         * @param[in] flags the flags to be used to open the output
          * @return an output descriptor for the newly opened stream or null in case of error.
          */
         sp<SwAudioOutputDescriptor> openOutputWithProfileAndDevice(
                 const sp<IOProfile>& profile, const DeviceVector& devices,
-                const audio_config_base_t *mixerConfig = nullptr);
+                const audio_config_base_t *mixerConfig = nullptr,
+                const audio_config_t *halConfig = nullptr,
+                audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE);
 
         bool isOffloadPossible(const audio_offload_info_t& offloadInfo,
                                bool durationIgnored = false);
@@ -1273,6 +1298,13 @@
                                        AudioProfileVector& audioProfiles,
                                        uint32_t flags,
                                        bool isInput);
+
+        sp<PreferredMixerAttributesInfo> getPreferredMixerAttributesInfo(
+                audio_port_handle_t devicePortId, product_strategy_t strategy);
+        status_t reopenOutput(sp<SwAudioOutputDescriptor> outputDesc,
+                              const audio_config_t *config,
+                              audio_output_flags_t flags,
+                              const char* caller);
 };
 
 };
diff --git a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
index b576b6d..1088088 100644
--- a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
+++ b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
@@ -2365,4 +2365,89 @@
     return Status::ok();
 }
 
+Status AudioPolicyService::getSupportedMixerAttributes(
+        int32_t portIdAidl, std::vector<media::AudioMixerAttributesInternal>* _aidl_return) {
+    if (mAudioPolicyManager == nullptr) {
+        return binderStatusFromStatusT(NO_INIT);
+    }
+
+    audio_port_handle_t portId = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_int32_t_audio_port_handle_t(portIdAidl));
+
+    std::vector<audio_mixer_attributes_t> mixerAttrs;
+    Mutex::Autolock _l(mLock);
+    RETURN_IF_BINDER_ERROR(
+            binderStatusFromStatusT(mAudioPolicyManager->getSupportedMixerAttributes(
+                    portId, mixerAttrs)));
+    *_aidl_return = VALUE_OR_RETURN_BINDER_STATUS(
+            convertContainer<std::vector<media::AudioMixerAttributesInternal>>(
+                    mixerAttrs,
+                    legacy2aidl_audio_mixer_attributes_t_AudioMixerAttributesInternal));
+    return Status::ok();
+}
+
+Status AudioPolicyService::setPreferredMixerAttributes(
+        const media::AudioAttributesInternal& attrAidl,
+        int32_t portIdAidl,
+        int32_t uidAidl,
+        const media::AudioMixerAttributesInternal& mixerAttrAidl) {
+    if (mAudioPolicyManager == nullptr) {
+        return binderStatusFromStatusT(NO_INIT);
+    }
+
+    audio_attributes_t  attr = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_AudioAttributesInternal_audio_attributes_t(attrAidl));
+    audio_mixer_attributes_t mixerAttr = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_AudioMixerAttributesInternal_audio_mixer_attributes_t(mixerAttrAidl));
+    uid_t uid = VALUE_OR_RETURN_BINDER_STATUS(aidl2legacy_int32_t_uid_t(uidAidl));
+    audio_port_handle_t portId = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_int32_t_audio_port_handle_t(portIdAidl));
+
+    Mutex::Autolock _l(mLock);
+    return binderStatusFromStatusT(
+            mAudioPolicyManager->setPreferredMixerAttributes(&attr, portId, uid, &mixerAttr));
+}
+
+Status AudioPolicyService::getPreferredMixerAttributes(
+        const media::AudioAttributesInternal& attrAidl,
+        int32_t portIdAidl,
+        std::optional<media::AudioMixerAttributesInternal>* _aidl_return) {
+    if (mAudioPolicyManager == nullptr) {
+        return binderStatusFromStatusT(NO_INIT);
+    }
+
+    audio_attributes_t  attr = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_AudioAttributesInternal_audio_attributes_t(attrAidl));
+    audio_port_handle_t portId = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_int32_t_audio_port_handle_t(portIdAidl));
+
+    Mutex::Autolock _l(mLock);
+    audio_mixer_attributes_t mixerAttr = AUDIO_MIXER_ATTRIBUTES_INITIALIZER;
+    RETURN_IF_BINDER_ERROR(
+            binderStatusFromStatusT(mAudioPolicyManager->getPreferredMixerAttributes(
+                    &attr, portId, &mixerAttr)));
+    *_aidl_return = VALUE_OR_RETURN_BINDER_STATUS(
+            legacy2aidl_audio_mixer_attributes_t_AudioMixerAttributesInternal(mixerAttr));
+    return Status::ok();
+}
+
+Status AudioPolicyService::clearPreferredMixerAttributes(
+        const media::AudioAttributesInternal& attrAidl,
+        int32_t portIdAidl,
+        int32_t uidAidl) {
+    if (mAudioPolicyManager == nullptr) {
+        return binderStatusFromStatusT(NO_INIT);
+    }
+
+    audio_attributes_t  attr = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_AudioAttributesInternal_audio_attributes_t(attrAidl));
+    uid_t uid = VALUE_OR_RETURN_BINDER_STATUS(aidl2legacy_int32_t_uid_t(uidAidl));
+    audio_port_handle_t portId = VALUE_OR_RETURN_BINDER_STATUS(
+            aidl2legacy_int32_t_audio_port_handle_t(portIdAidl));
+
+    Mutex::Autolock _l(mLock);
+    return binderStatusFromStatusT(
+            mAudioPolicyManager->clearPreferredMixerAttributes(&attr, portId, uid));
+}
+
 } // namespace android
diff --git a/services/audiopolicy/service/AudioPolicyService.cpp b/services/audiopolicy/service/AudioPolicyService.cpp
index b87320e..48997db 100644
--- a/services/audiopolicy/service/AudioPolicyService.cpp
+++ b/services/audiopolicy/service/AudioPolicyService.cpp
@@ -155,7 +155,11 @@
 BINDER_METHOD_ENTRY(getSpatializer) \
 BINDER_METHOD_ENTRY(canBeSpatialized) \
 BINDER_METHOD_ENTRY(getDirectPlaybackSupport) \
-BINDER_METHOD_ENTRY(getDirectProfilesForAttributes) \
+BINDER_METHOD_ENTRY(getDirectProfilesForAttributes)  \
+BINDER_METHOD_ENTRY(getSupportedMixerAttributes) \
+BINDER_METHOD_ENTRY(setPreferredMixerAttributes) \
+BINDER_METHOD_ENTRY(getPreferredMixerAttributes) \
+BINDER_METHOD_ENTRY(clearPreferredMixerAttributes) \
 
 // singleton for Binder Method Statistics for IAudioPolicyService
 static auto& getIAudioPolicyServiceStatistics() {
@@ -1324,7 +1328,9 @@
         case TRANSACTION_removeDevicesRoleForCapturePreset:
         case TRANSACTION_clearDevicesRoleForCapturePreset:
         case TRANSACTION_getDevicesForRoleAndCapturePreset:
-        case TRANSACTION_getSpatializer: {
+        case TRANSACTION_getSpatializer:
+        case TRANSACTION_setPreferredMixerAttributes:
+        case TRANSACTION_clearPreferredMixerAttributes: {
             if (!isServiceUid(IPCThreadState::self()->getCallingUid())) {
                 ALOGW("%s: transaction %d received from PID %d unauthorized UID %d",
                       __func__, code, IPCThreadState::self()->getCallingPid(),
diff --git a/services/audiopolicy/service/AudioPolicyService.h b/services/audiopolicy/service/AudioPolicyService.h
index 3a7fffa..58af46d 100644
--- a/services/audiopolicy/service/AudioPolicyService.h
+++ b/services/audiopolicy/service/AudioPolicyService.h
@@ -277,6 +277,22 @@
     binder::Status getDirectProfilesForAttributes(const media::AudioAttributesInternal& attr,
                         std::vector<media::audio::common::AudioProfile>* _aidl_return) override;
 
+    binder::Status getSupportedMixerAttributes(
+            int32_t portId,
+            std::vector<media::AudioMixerAttributesInternal>* _aidl_return) override;
+    binder::Status setPreferredMixerAttributes(
+            const media::AudioAttributesInternal& attr,
+            int32_t portId,
+            int32_t uid,
+            const media::AudioMixerAttributesInternal& mixerAttr) override;
+    binder::Status getPreferredMixerAttributes(
+            const media::AudioAttributesInternal& attr,
+            int32_t portId,
+            std::optional<media::AudioMixerAttributesInternal>* _aidl_return) override;
+    binder::Status clearPreferredMixerAttributes(const media::AudioAttributesInternal& attr,
+                                                 int32_t portId,
+                                                 int32_t uid) override;
+
     status_t onTransact(uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) override;
 
     // IBinder::DeathRecipient
diff --git a/services/audiopolicy/tests/AudioPolicyManagerTestClient.h b/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
index 96f58d2..2a65546 100644
--- a/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
+++ b/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
@@ -131,8 +131,6 @@
 
     size_t getAudioPortListUpdateCount() const { return mAudioPortListUpdateCount; }
 
-    virtual void addSupportedFormat(audio_format_t /* format */) {}
-
     void onRoutingUpdated() override {
         mRoutingUpdatedUpdateCount++;
     }
@@ -178,6 +176,38 @@
         return &(*it);
     }
 
+    String8 getParameters(audio_io_handle_t /* ioHandle */, const String8&  /* keys*/ ) override {
+        AudioParameter mAudioParameters;
+        std::string formats;
+        for (const auto& f : mSupportedFormats) {
+            if (!formats.empty()) formats += AUDIO_PARAMETER_VALUE_LIST_SEPARATOR;
+            formats += audio_format_to_string(f);
+        }
+        mAudioParameters.add(
+                String8(AudioParameter::keyStreamSupportedFormats),
+                String8(formats.c_str()));
+        mAudioParameters.addInt(String8(AudioParameter::keyStreamSupportedSamplingRates), 48000);
+        std::string channelMasks;
+        for (const auto& cm : mSupportedChannelMasks) {
+            if (audio_channel_mask_is_valid(cm)) {
+                continue;
+            }
+            if (!channelMasks.empty()) channelMasks += AUDIO_PARAMETER_VALUE_LIST_SEPARATOR;
+            channelMasks += audio_channel_mask_to_string(cm);
+        }
+        mAudioParameters.add(
+                String8(AudioParameter::keyStreamSupportedChannels), String8(channelMasks.c_str()));
+        return mAudioParameters.toString();
+    }
+
+    void addSupportedFormat(audio_format_t format) {
+        mSupportedFormats.insert(format);
+    }
+
+    void addSupportedChannelMask(audio_channel_mask_t channelMask) {
+        mSupportedChannelMasks.insert(channelMask);
+    }
+
 private:
     audio_module_handle_t mNextModuleHandle = AUDIO_MODULE_HANDLE_NONE + 1;
     audio_io_handle_t mNextIoHandle = AUDIO_IO_HANDLE_NONE + 1;
@@ -188,6 +218,8 @@
     size_t mRoutingUpdatedUpdateCount = 0;
     std::vector<struct audio_port_v7> mConnectedDevicePorts;
     std::vector<struct audio_port_v7> mDisconnectedDevicePorts;
+    std::set<audio_format_t> mSupportedFormats;
+    std::set<audio_channel_mask_t> mSupportedChannelMasks;
 };
 
 } // namespace android
diff --git a/services/audiopolicy/tests/AudioPolicyManagerTestClientForHdmi.h b/services/audiopolicy/tests/AudioPolicyManagerTestClientForHdmi.h
deleted file mode 100644
index 7343b9b..0000000
--- a/services/audiopolicy/tests/AudioPolicyManagerTestClientForHdmi.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * 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.
- */
-
-#include <map>
-#include <set>
-
-#include <system/audio.h>
-#include <utils/Log.h>
-#include <utils/String8.h>
-
-#include "AudioPolicyTestClient.h"
-
-namespace android {
-
-class AudioPolicyManagerTestClientForHdmi : public AudioPolicyManagerTestClient {
-public:
-    String8 getParameters(audio_io_handle_t /* ioHandle */, const String8&  /* keys*/ ) override {
-        AudioParameter mAudioParameters;
-        std::string formats;
-        for (const auto& f : mSupportedFormats) {
-            if (!formats.empty()) formats += AUDIO_PARAMETER_VALUE_LIST_SEPARATOR;
-            formats += audio_format_to_string(f);
-        }
-        mAudioParameters.add(
-                String8(AudioParameter::keyStreamSupportedFormats),
-                String8(formats.c_str()));
-        mAudioParameters.addInt(String8(AudioParameter::keyStreamSupportedSamplingRates), 48000);
-        mAudioParameters.add(String8(AudioParameter::keyStreamSupportedChannels), String8(""));
-        return mAudioParameters.toString();
-    }
-
-    void addSupportedFormat(audio_format_t format) override {
-        mSupportedFormats.insert(format);
-    }
-
-private:
-    std::set<audio_format_t> mSupportedFormats;
-};
-
-} // namespace android
diff --git a/services/audiopolicy/tests/audiopolicymanager_tests.cpp b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
index ba5b6b2..4ad6d7a 100644
--- a/services/audiopolicy/tests/audiopolicymanager_tests.cpp
+++ b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
@@ -35,7 +35,6 @@
 
 #include "AudioPolicyInterface.h"
 #include "AudioPolicyManagerTestClient.h"
-#include "AudioPolicyManagerTestClientForHdmi.h"
 #include "AudioPolicyTestClient.h"
 #include "AudioPolicyTestManager.h"
 
@@ -982,6 +981,77 @@
     }
 }
 
+TEST_F(AudioPolicyManagerTestWithConfigurationFile, PreferredMixerAttributes) {
+    mClient->addSupportedFormat(AUDIO_FORMAT_PCM_16_BIT);
+    mClient->addSupportedChannelMask(AUDIO_CHANNEL_OUT_STEREO);
+    ASSERT_EQ(NO_ERROR, mManager->setDeviceConnectionState(AUDIO_DEVICE_OUT_USB_DEVICE,
+                                                           AUDIO_POLICY_DEVICE_STATE_AVAILABLE,
+                                                           "", "", AUDIO_FORMAT_DEFAULT));
+    auto devices = mManager->getAvailableOutputDevices();
+    audio_port_handle_t maxPortId = 0;
+    audio_port_handle_t speakerPortId;
+    audio_port_handle_t usbPortId;
+    for (auto device : devices) {
+        maxPortId = std::max(maxPortId, device->getId());
+        if (device->type() == AUDIO_DEVICE_OUT_SPEAKER) {
+            speakerPortId = device->getId();
+        } else if (device->type() == AUDIO_DEVICE_OUT_USB_DEVICE) {
+            usbPortId = device->getId();
+        }
+    }
+
+    const uid_t uid = 1234;
+    const uid_t otherUid = 4321;
+    const audio_attributes_t mediaAttr = {
+            .content_type = AUDIO_CONTENT_TYPE_MUSIC,
+            .usage = AUDIO_USAGE_MEDIA,
+    };
+    const audio_attributes_t alarmAttr = {
+            .content_type = AUDIO_CONTENT_TYPE_SONIFICATION,
+            .usage = AUDIO_USAGE_ALARM,
+    };
+
+    std::vector<audio_mixer_attributes_t> mixerAttributes;
+    EXPECT_EQ(NO_ERROR, mManager->getSupportedMixerAttributes(usbPortId, mixerAttributes));
+    for (const auto attrToSet : mixerAttributes) {
+        audio_mixer_attributes_t attrFromQuery = AUDIO_MIXER_ATTRIBUTES_INITIALIZER;
+
+        // The given device is not available
+        EXPECT_EQ(BAD_VALUE,
+                  mManager->setPreferredMixerAttributes(
+                          &mediaAttr, maxPortId + 1, uid, &attrToSet));
+        // The only allowed device is USB
+        EXPECT_EQ(BAD_VALUE,
+                  mManager->setPreferredMixerAttributes(
+                          &mediaAttr, speakerPortId, uid, &attrToSet));
+        // The only allowed usage is media
+        EXPECT_EQ(BAD_VALUE,
+                  mManager->setPreferredMixerAttributes(&alarmAttr, usbPortId, uid, &attrToSet));
+        // Nothing set yet, must get null when query
+        EXPECT_EQ(NAME_NOT_FOUND,
+                  mManager->getPreferredMixerAttributes(&mediaAttr, usbPortId, &attrFromQuery));
+        EXPECT_EQ(NO_ERROR,
+                  mManager->setPreferredMixerAttributes(
+                          &mediaAttr, usbPortId, uid, &attrToSet));
+        EXPECT_EQ(NO_ERROR,
+                  mManager->getPreferredMixerAttributes(&mediaAttr, usbPortId, &attrFromQuery));
+        EXPECT_EQ(attrToSet.config.format, attrFromQuery.config.format);
+        EXPECT_EQ(attrToSet.config.sample_rate, attrFromQuery.config.sample_rate);
+        EXPECT_EQ(attrToSet.config.channel_mask, attrFromQuery.config.channel_mask);
+        EXPECT_EQ(attrToSet.mixer_behavior, attrFromQuery.mixer_behavior);
+        EXPECT_EQ(NAME_NOT_FOUND,
+                  mManager->clearPreferredMixerAttributes(&mediaAttr, speakerPortId, uid));
+        EXPECT_EQ(PERMISSION_DENIED,
+                  mManager->clearPreferredMixerAttributes(&mediaAttr, usbPortId, otherUid));
+        EXPECT_EQ(NO_ERROR,
+                  mManager->clearPreferredMixerAttributes(&mediaAttr, usbPortId, uid));
+    }
+
+    ASSERT_EQ(NO_ERROR, mManager->setDeviceConnectionState(AUDIO_DEVICE_OUT_USB_DEVICE,
+                                                           AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE,
+                                                           "", "", AUDIO_FORMAT_LDAC));
+}
+
 class AudioPolicyManagerTestDynamicPolicy : public AudioPolicyManagerTestWithConfigurationFile {
 protected:
     void TearDown() override;
@@ -1143,9 +1213,6 @@
     std::map<audio_format_t, bool> getSurroundFormatsHelper();
     std::vector<audio_format_t> getReportedSurroundFormatsHelper();
     std::unordered_set<audio_format_t> getFormatsFromPorts();
-    AudioPolicyManagerTestClient* getClient() override {
-        return new AudioPolicyManagerTestClientForHdmi;
-    }
     void TearDown() override;
 
     static const std::string sTvConfig;
diff --git a/services/audiopolicy/tests/resources/test_audio_policy_configuration.xml b/services/audiopolicy/tests/resources/test_audio_policy_configuration.xml
index d342aea..c937d3a 100644
--- a/services/audiopolicy/tests/resources/test_audio_policy_configuration.xml
+++ b/services/audiopolicy/tests/resources/test_audio_policy_configuration.xml
@@ -54,6 +54,7 @@
                     <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
                            samplingRates="8000 16000 32000 48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
                 </mixPort>
+                <mixPort name="hifi_output" role="source"/>
             </mixPorts>
             <devicePorts>
                 <devicePort tagName="Speaker" type="AUDIO_DEVICE_OUT_SPEAKER" role="sink">
@@ -74,6 +75,8 @@
                 <devicePort tagName="BT A2DP Out" type="AUDIO_DEVICE_OUT_BLUETOOTH_A2DP" role="sink"
                             encodedFormats="AUDIO_FORMAT_LDAC AUDIO_FORMAT_APTX AUDIO_FORMAT_APTX_HD AUDIO_FORMAT_AAC AUDIO_FORMAT_SBC">
                 </devicePort>
+                <devicePort tagName="USB Device Out" type="AUDIO_DEVICE_OUT_USB_DEVICE" role="sink">
+                </devicePort>
             </devicePorts>
             <routes>
                 <route type="mix" sink="Speaker"
@@ -89,7 +92,9 @@
                 <route type="mix" sink="mixport_bt_hfp_input"
                        sources="BT SCO Headset Mic"/>
                 <route type="mix" sink="BT A2DP Out"
-                       sources="primary output"/>
+                       sources="primary output,hifi_output"/>
+                <route type="mix" sink="USB Device Out"
+                       sources="primary output,hifi_output"/>
             </routes>
         </module>