Merge changes from topics "presubmit-am-87e43861d082492cad38dc75a9f31cdb", "presubmit-am-a8669f4a68d94c8d9b842b36e692e795" into tm-dev

* changes:
  [BUG] AudioPolicyManager: prevent unecessary force routing on SwOutput
  [BUG] AudioPolicyManager: prevent patch leak on SwOutput used for bridges
diff --git a/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h b/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h
index 18cf0c1..f57ac64 100644
--- a/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h
+++ b/services/audiopolicy/common/managerdefinitions/include/AudioOutputDescriptor.h
@@ -305,6 +305,7 @@
     {
         return !devices().isEmpty() ? devices().itemAt(0)->hasGainController() : false;
     }
+    bool isRouted() const { return mPatchHandle != AUDIO_PATCH_HANDLE_NONE; }
 
     DeviceVector mDevices; /**< current devices this output is routed to */
     wp<AudioPolicyMix> mPolicyMix;  // non NULL when used by a dynamic policy
diff --git a/services/audiopolicy/common/managerdefinitions/include/ClientDescriptor.h b/services/audiopolicy/common/managerdefinitions/include/ClientDescriptor.h
index dc2403c..6f95012 100644
--- a/services/audiopolicy/common/managerdefinitions/include/ClientDescriptor.h
+++ b/services/audiopolicy/common/managerdefinitions/include/ClientDescriptor.h
@@ -56,7 +56,13 @@
 
     virtual void dump(String8 *dst, int spaces) const;
     virtual std::string toShortString() const;
-
+    /**
+     * @brief isInternal
+     * @return true if the client corresponds to an audio patch created from createAudioPatch API or
+     * for call audio routing, or false if the client corresponds to an AudioTrack, AudioRecord or
+     * HW Audio Source.
+     */
+    virtual bool isInternal() const { return false; }
     audio_port_handle_t portId() const { return mPortId; }
     uid_t uid() const { return mUid; }
     audio_session_t session() const { return mSessionId; };
@@ -69,8 +75,16 @@
     bool isPreferredDeviceForExclusiveUse() const { return mPreferredDeviceForExclusiveUse; }
     virtual void setActive(bool active) { mActive = active; }
     bool active() const { return mActive; }
+    /**
+     * @brief hasPreferredDevice Note that as internal clients use preferred device for convenience,
+     * we do hide this internal behavior to prevent from regression (like invalidating track for
+     * clients following same strategies...)
+     * @param activeOnly
+     * @return
+     */
     bool hasPreferredDevice(bool activeOnly = false) const {
-        return mPreferredDeviceId != AUDIO_PORT_HANDLE_NONE && (!activeOnly || mActive);
+        return !isInternal() &&
+                mPreferredDeviceId != AUDIO_PORT_HANDLE_NONE && (!activeOnly || mActive);
     }
 
 private:
@@ -211,6 +225,11 @@
         mPatchHandle = AUDIO_PATCH_HANDLE_NONE;
         mSinkDevice = nullptr;
     }
+    bool belongsToOutput(const sp<SwAudioOutputDescriptor> &swOutput) const {
+        return swOutput != nullptr && mSwOutput.promote() == swOutput;
+    }
+    void setUseSwBridge() { mUseSwBridge = true; }
+    bool useSwBridge() const { return mUseSwBridge; }
     bool isConnected() const { return mPatchHandle != AUDIO_PATCH_HANDLE_NONE; }
     audio_patch_handle_t getPatchHandle() const { return mPatchHandle; }
     sp<DeviceDescriptor> srcDevice() const { return mSrcDevice; }
@@ -229,6 +248,35 @@
     sp<DeviceDescriptor> mSinkDevice;
     wp<SwAudioOutputDescriptor> mSwOutput;
     wp<HwAudioOutputDescriptor> mHwOutput;
+    bool mUseSwBridge = false;
+};
+
+/**
+ * @brief The InternalSourceClientDescriptor class
+ * Specialized Client Descriptor for either a raw patch created from @see createAudioPatch API
+ * or for internal audio patches managed by APM (e.g. phone call patches).
+ * Whatever the bridge created (software or hardware), we need a client to track the activity
+ * and manage volumes.
+ * The Audio Patch requested sink is expressed as a preferred device which allows to route
+ * the SwOutput. Then APM will performs checks on the UID (against UID of Audioserver) of the
+ * requester to prevent rerouting SwOutput involved in raw patches.
+ */
+class InternalSourceClientDescriptor: public SourceClientDescriptor
+{
+public:
+    InternalSourceClientDescriptor(
+            audio_port_handle_t portId, uid_t uid, audio_attributes_t attributes,
+            const struct audio_port_config &config, const sp<DeviceDescriptor>& srcDevice,
+             const sp<DeviceDescriptor>& sinkDevice,
+            product_strategy_t strategy, VolumeSource volumeSource) :
+        SourceClientDescriptor(
+            portId, uid, attributes, config, srcDevice, AUDIO_STREAM_PATCH, strategy,
+            volumeSource)
+    {
+        setPreferredDeviceId(sinkDevice->getId());
+    }
+    bool isInternal() const override { return true; }
+    ~InternalSourceClientDescriptor() override = default;
 };
 
 class SourceClientCollection :
diff --git a/services/audiopolicy/common/managerdefinitions/src/ClientDescriptor.cpp b/services/audiopolicy/common/managerdefinitions/src/ClientDescriptor.cpp
index 1132a29..d1655ef 100644
--- a/services/audiopolicy/common/managerdefinitions/src/ClientDescriptor.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/ClientDescriptor.cpp
@@ -100,7 +100,8 @@
     TrackClientDescriptor::TrackClientDescriptor(portId, uid, AUDIO_SESSION_NONE, attributes,
         {config.sample_rate, config.channel_mask, config.format}, AUDIO_PORT_HANDLE_NONE,
         stream, strategy, volumeSource, AUDIO_OUTPUT_FLAG_NONE, false,
-        {} /* Sources do not support secondary outputs*/, nullptr), mSrcDevice(srcDevice)
+        {} /* Sources do not support secondary outputs*/, nullptr),
+    mSrcDevice(srcDevice)
 {
 }
 
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index c3c9753..ff4705c 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -664,12 +664,8 @@
     ALOGV("%s device rxDevice %s txDevice %s", __func__,
           rxDevices.itemAt(0)->toString().c_str(), txSourceDevice->toString().c_str());
 
-    disconnectTelephonyRxAudioSource();
-    // release TX patch if any
-    if (mCallTxPatch != 0) {
-        releaseAudioPatchInternal(mCallTxPatch->getHandle());
-        mCallTxPatch.clear();
-    }
+    disconnectTelephonyAudioSource(mCallRxSourceClient);
+    disconnectTelephonyAudioSource(mCallTxSourceClient);
 
     auto telephonyRxModule =
         mHwModules.getModuleForDeviceType(AUDIO_DEVICE_IN_TELEPHONY_RX, AUDIO_FORMAT_DEFAULT);
@@ -727,7 +723,7 @@
                 closeActiveClients(activeDesc);
             }
         }
-        mCallTxPatch = createTelephonyPatch(false /*isRx*/, txSourceDevice, delayMs);
+        connectTelephonyTxAudioSource(txSourceDevice, txSinkDevice, delayMs);
     }
     if (waitMs != nullptr) {
         *waitMs = muteWaitMs;
@@ -735,36 +731,6 @@
     return NO_ERROR;
 }
 
-sp<AudioPatch> AudioPolicyManager::createTelephonyPatch(
-        bool isRx, const sp<DeviceDescriptor> &device, uint32_t delayMs) {
-    PatchBuilder patchBuilder;
-
-    if (device == nullptr) {
-        return nullptr;
-    }
-
-    // @TODO: still ignoring the address, or not dealing platform with multiple telephony devices
-    if (isRx) {
-        patchBuilder.addSink(device).
-                addSource(mAvailableInputDevices.getDevice(
-                    AUDIO_DEVICE_IN_TELEPHONY_RX, String8(), AUDIO_FORMAT_DEFAULT));
-    } else {
-        patchBuilder.addSource(device).
-                addSink(mAvailableOutputDevices.getDevice(
-                    AUDIO_DEVICE_OUT_TELEPHONY_TX, String8(), AUDIO_FORMAT_DEFAULT));
-    }
-
-    audio_patch_handle_t patchHandle = AUDIO_PATCH_HANDLE_NONE;
-    status_t status =
-            createAudioPatchInternal(patchBuilder.patch(), &patchHandle, mUidCached, delayMs);
-    ssize_t index = mAudioPatches.indexOfKey(patchHandle);
-    if (status != NO_ERROR || index < 0) {
-        ALOGW("%s() error %d creating %s audio patch", __func__, status, isRx ? "RX" : "TX");
-        return nullptr;
-    }
-    return mAudioPatches.valueAt(index);
-}
-
 bool AudioPolicyManager::isDeviceOfModule(
         const sp<DeviceDescriptor>& devDesc, const char *moduleId) const {
     sp<HwModule> module = mHwModules.getModuleFromName(moduleId);
@@ -779,20 +745,55 @@
 
 void AudioPolicyManager::connectTelephonyRxAudioSource()
 {
-    disconnectTelephonyRxAudioSource();
+    disconnectTelephonyAudioSource(mCallRxSourceClient);
     const struct audio_port_config source = {
         .role = AUDIO_PORT_ROLE_SOURCE, .type = AUDIO_PORT_TYPE_DEVICE,
         .ext.device.type = AUDIO_DEVICE_IN_TELEPHONY_RX, .ext.device.address = ""
     };
     const auto aa = mEngine->getAttributesForStreamType(AUDIO_STREAM_VOICE_CALL);
-    status_t status = startAudioSource(&source, &aa, &mCallRxSourceClientPort, 0/*uid*/);
-    ALOGE_IF(status != NO_ERROR, "%s failed to start Telephony Rx AudioSource", __func__);
+    mCallRxSourceClient = startAudioSourceInternal(&source, &aa, 0/*uid*/);
+    ALOGE_IF(mCallRxSourceClient == nullptr,
+             "%s failed to start Telephony Rx AudioSource", __func__);
 }
 
-void AudioPolicyManager::disconnectTelephonyRxAudioSource()
+void AudioPolicyManager::disconnectTelephonyAudioSource(sp<SourceClientDescriptor> &clientDesc)
 {
-    stopAudioSource(mCallRxSourceClientPort);
-    mCallRxSourceClientPort = AUDIO_PORT_HANDLE_NONE;
+    if (clientDesc == nullptr) {
+        return;
+    }
+    ALOGW_IF(stopAudioSource(clientDesc->portId()) != NO_ERROR,
+            "%s error stopping audio source", __func__);
+    clientDesc.clear();
+}
+
+void AudioPolicyManager::connectTelephonyTxAudioSource(
+        const sp<DeviceDescriptor> &srcDevice, const sp<DeviceDescriptor> &sinkDevice,
+        uint32_t delayMs)
+{
+    disconnectTelephonyAudioSource(mCallTxSourceClient);
+    if (srcDevice == nullptr || sinkDevice == nullptr) {
+        ALOGW("%s could not create patch, invalid sink and/or source device(s)", __func__);
+        return;
+    }
+    PatchBuilder patchBuilder;
+    patchBuilder.addSource(srcDevice).addSink(sinkDevice);
+    ALOGV("%s between source %s and sink %s", __func__,
+            srcDevice->toString().c_str(), sinkDevice->toString().c_str());
+    auto callTxSourceClientPortId = PolicyAudioPort::getNextUniqueId();
+    const audio_attributes_t aa = { .source = AUDIO_SOURCE_VOICE_COMMUNICATION };
+    struct audio_port_config source = {};
+    srcDevice->toAudioPortConfig(&source);
+    mCallTxSourceClient = new InternalSourceClientDescriptor(
+                callTxSourceClientPortId, mUidCached, aa, source, srcDevice, sinkDevice,
+                mCommunnicationStrategy, toVolumeSource(aa));
+    audio_patch_handle_t patchHandle = AUDIO_PATCH_HANDLE_NONE;
+    status_t status = connectAudioSourceToSink(
+                mCallTxSourceClient, sinkDevice, patchBuilder.patch(), patchHandle, mUidCached,
+                delayMs);
+    ALOGE_IF(status != NO_ERROR, "%s() error %d creating TX audio patch", __func__, status);
+    if (status == NO_ERROR) {
+        mAudioSources.add(callTxSourceClientPortId, mCallTxSourceClient);
+    }
 }
 
 void AudioPolicyManager::setPhoneState(audio_mode_t state)
@@ -860,11 +861,8 @@
                 rxDevices = mPrimaryOutput->devices();
             }
             if (oldState == AUDIO_MODE_IN_CALL) {
-                disconnectTelephonyRxAudioSource();
-                if (mCallTxPatch != 0) {
-                    releaseAudioPatchInternal(mCallTxPatch->getHandle());
-                    mCallTxPatch.clear();
-                }
+                disconnectTelephonyAudioSource(mCallRxSourceClient);
+                disconnectTelephonyAudioSource(mCallTxSourceClient);
             }
             setOutputDevices(mPrimaryOutput, rxDevices, force, 0);
         }
@@ -874,8 +872,10 @@
     for (size_t i = 0; i < mOutputs.size(); i++) {
         sp<SwAudioOutputDescriptor> desc = mOutputs.valueAt(i);
         DeviceVector newDevices = getNewOutputDevices(desc, true /*fromCache*/);
-        if (state != AUDIO_MODE_IN_CALL || desc != mPrimaryOutput) {
-            setOutputDevices(desc, newDevices, !newDevices.isEmpty(), 0 /*delayMs*/);
+        if (state != AUDIO_MODE_IN_CALL || (desc != mPrimaryOutput && !isTelephonyRxOrTx(desc))) {
+            bool forceRouting = !newDevices.isEmpty();
+            setOutputDevices(desc, newDevices, forceRouting, 0 /*delayMs*/, nullptr,
+                             true /*requiresMuteCheck*/, !forceRouting /*requiresVolumeCheck*/);
         }
     }
 
@@ -1510,6 +1510,27 @@
     return msdPatches;
 }
 
+bool AudioPolicyManager::isMsdPatch(const audio_patch_handle_t &handle) const {
+    ssize_t index = mAudioPatches.indexOfKey(handle);
+    if (index < 0) {
+        return false;
+    }
+    const sp<AudioPatch> patch = mAudioPatches.valueAt(index);
+    sp<HwModule> msdModule = mHwModules.getModuleFromName(AUDIO_HARDWARE_MODULE_ID_MSD);
+    if (msdModule == nullptr) {
+        return false;
+    }
+    const struct audio_port_config *sink = &patch->mPatch.sinks[0];
+    if (getMsdAudioOutDevices().contains(mAvailableOutputDevices.getDeviceFromId(sink->id))) {
+        return true;
+    }
+    index = getMsdOutputPatches().indexOfKey(handle);
+    if (index < 0) {
+        return false;
+    }
+    return true;
+}
+
 status_t AudioPolicyManager::getMsdProfiles(bool hwAvSync,
                                             const InputProfileCollection &inputProfiles,
                                             const OutputProfileCollection &outputProfiles,
@@ -1939,8 +1960,7 @@
 
     // force device change if the output is inactive and no audio patch is already present.
     // check active before incrementing usage count
-    bool force = !outputDesc->isActive() &&
-            (outputDesc->getPatchHandle() == AUDIO_PATCH_HANDLE_NONE);
+    bool force = !outputDesc->isActive() && !outputDesc->isRouted();
 
     DeviceVector devices;
     sp<AudioPolicyMix> policyMix = outputDesc->mPolicyMix.promote();
@@ -3511,11 +3531,15 @@
     for (size_t i = 0; i < mOutputs.size(); i++) {
         sp<SwAudioOutputDescriptor> outputDesc = mOutputs.valueAt(i);
         DeviceVector newDevices = getNewOutputDevices(outputDesc, true /*fromCache*/);
-        if ((mEngine->getPhoneState() != AUDIO_MODE_IN_CALL) || (outputDesc != mPrimaryOutput)) {
+        if ((mEngine->getPhoneState() != AUDIO_MODE_IN_CALL) ||
+                (outputDesc != mPrimaryOutput && !isTelephonyRxOrTx(outputDesc))) {
             // As done in setDeviceConnectionState, we could also fix default device issue by
             // preventing the force re-routing in case of default dev that distinguishes on address.
             // Let's give back to engine full device choice decision however.
-            waitMs = setOutputDevices(outputDesc, newDevices, !newDevices.isEmpty(), delayMs);
+            bool forceRouting = !newDevices.isEmpty();
+            waitMs = setOutputDevices(outputDesc, newDevices, forceRouting, delayMs, nullptr,
+                                      true /*requiresMuteCheck*/,
+                                      !forceRouting /*requiresVolumeCheck*/);
             // Only apply special touch sound delay once
             delayMs = 0;
         }
@@ -4064,17 +4088,15 @@
     return BAD_VALUE;
 }
 
-status_t AudioPolicyManager::createAudioPatchInternal(const struct audio_patch *patch,
-                                                      audio_patch_handle_t *handle,
-                                                      uid_t uid, uint32_t delayMs,
-                                                      const sp<SourceClientDescriptor>& sourceDesc)
+status_t AudioPolicyManager::createAudioPatch(const struct audio_patch *patch,
+                                              audio_patch_handle_t *handle,
+                                              uid_t uid)
 {
     ALOGV("%s", __func__);
     if (handle == NULL || patch == NULL) {
         return BAD_VALUE;
     }
     ALOGV("%s num sources %d num sinks %d", __func__, patch->num_sources, patch->num_sinks);
-
     if (!audio_patch_is_valid(patch)) {
         return BAD_VALUE;
     }
@@ -4082,7 +4104,6 @@
     if (patch->num_sources > 1) {
         return INVALID_OPERATION;
     }
-
     if (patch->sources[0].role != AUDIO_PORT_ROLE_SOURCE) {
         return INVALID_OPERATION;
     }
@@ -4092,6 +4113,86 @@
         }
     }
 
+    sp<DeviceDescriptor> srcDevice = mAvailableInputDevices.getDeviceFromId(patch->sources[0].id);
+    sp<DeviceDescriptor> sinkDevice = mAvailableOutputDevices.getDeviceFromId(patch->sinks[0].id);
+    if (srcDevice == nullptr || sinkDevice == nullptr) {
+        ALOGW("%s could not create patch, invalid sink and/or source device(s)", __func__);
+        return BAD_VALUE;
+    }
+    ALOGV("%s between source %s and sink %s", __func__,
+            srcDevice->toString().c_str(), sinkDevice->toString().c_str());
+    audio_port_handle_t portId = PolicyAudioPort::getNextUniqueId();
+    // Default attributes, default volume priority, not to infer with non raw audio patches.
+    audio_attributes_t attributes = attributes_initializer(AUDIO_USAGE_MEDIA);
+    const struct audio_port_config *source = &patch->sources[0];
+    sp<SourceClientDescriptor> sourceDesc =
+            new InternalSourceClientDescriptor(
+                portId, uid, attributes, *source, srcDevice, sinkDevice,
+                mEngine->getProductStrategyForAttributes(attributes), toVolumeSource(attributes));
+
+    status_t status =
+            connectAudioSourceToSink(sourceDesc, sinkDevice, patch, *handle, uid, 0 /* delayMs */);
+
+    if (status != NO_ERROR) {
+        return INVALID_OPERATION;
+    }
+    mAudioSources.add(portId, sourceDesc);
+    return NO_ERROR;
+}
+
+status_t AudioPolicyManager::connectAudioSourceToSink(
+        const sp<SourceClientDescriptor>& sourceDesc, const sp<DeviceDescriptor> &sinkDevice,
+        const struct audio_patch *patch,
+        audio_patch_handle_t &handle,
+        uid_t uid, uint32_t delayMs)
+{
+    status_t status = createAudioPatchInternal(patch, &handle, uid, delayMs, sourceDesc);
+    if (status != NO_ERROR || mAudioPatches.indexOfKey(handle) < 0) {
+        ALOGW("%s patch panel could not connect device patch, error %d", __func__, status);
+        return INVALID_OPERATION;
+    }
+    sourceDesc->connect(handle, sinkDevice);
+    if (isMsdPatch(handle)) {
+        return NO_ERROR;
+    }
+    // SW Bridge? (@todo: HW bridge, keep track of HwOutput for device selection "reconsideration")
+    sp<SwAudioOutputDescriptor> swOutput = sourceDesc->swOutput().promote();
+    ALOG_ASSERT(swOutput != nullptr, "%s: a swOutput shall always be associated", __func__);
+    if (swOutput->getClient(sourceDesc->portId()) != nullptr) {
+        ALOGW("%s source portId has already been attached to outputDesc", __func__);
+        goto FailurePatchAdded;
+    }
+    status = swOutput->start();
+    if (status != NO_ERROR) {
+        goto FailureSourceAdded;
+    }
+    swOutput->addClient(sourceDesc);
+    status = startSource(swOutput, sourceDesc, &delayMs);
+    if (status != NO_ERROR) {
+        ALOGW("%s failed to start source, error %d", __FUNCTION__, status);
+        goto FailureSourceActive;
+    }
+    if (delayMs != 0) {
+        usleep(delayMs * 1000);
+    }
+    return NO_ERROR;
+
+FailureSourceActive:
+    swOutput->stop();
+    releaseOutput(sourceDesc->portId());
+FailureSourceAdded:
+    sourceDesc->setSwOutput(nullptr);
+FailurePatchAdded:
+    releaseAudioPatchInternal(handle);
+    return INVALID_OPERATION;
+}
+
+status_t AudioPolicyManager::createAudioPatchInternal(const struct audio_patch *patch,
+                                                      audio_patch_handle_t *handle,
+                                                      uid_t uid, uint32_t delayMs,
+                                                      const sp<SourceClientDescriptor>& sourceDesc)
+{
+    ALOGV("%s num sources %d num sinks %d", __func__, patch->num_sources, patch->num_sinks);
     sp<AudioPatch> patchDesc;
     ssize_t index = mAudioPatches.indexOfKey(*handle);
 
@@ -4280,7 +4381,7 @@
                 // in config XML to reach the sink so that is can be declared as available.
                 audio_io_handle_t output = AUDIO_IO_HANDLE_NONE;
                 sp<SwAudioOutputDescriptor> outputDesc = nullptr;
-                if (sourceDesc != nullptr) {
+                if (!sourceDesc->isInternal()) {
                     // take care of dynamic routing for SwOutput selection,
                     audio_attributes_t attributes = sourceDesc->attributes();
                     audio_stream_type_t stream = sourceDesc->stream();
@@ -4308,44 +4409,49 @@
                         return INVALID_OPERATION;
                     }
                     sourceDesc->setSwOutput(outputDesc);
+                } else {
+                    // Same for "raw patches" aka created from createAudioPatch API
+                    SortedVector<audio_io_handle_t> outputs =
+                            getOutputsForDevices(DeviceVector(sinkDevice), mOutputs);
+                    // if the sink device is reachable via an opened output stream, request to
+                    // go via this output stream by adding a second source to the patch
+                    // description
+                    output = selectOutput(outputs);
+                    if (output == AUDIO_IO_HANDLE_NONE) {
+                        ALOGE("%s no output available for internal patch sink", __func__);
+                        return INVALID_OPERATION;
+                    }
+                    outputDesc = mOutputs.valueFor(output);
+                    if (outputDesc->isDuplicated()) {
+                        ALOGV("%s output for device %s is duplicated",
+                              __func__, sinkDevice->toString().c_str());
+                        return INVALID_OPERATION;
+                    }
+                    sourceDesc->setSwOutput(outputDesc);
                 }
                 // create a software bridge in PatchPanel if:
                 // - source and sink devices are on different HW modules OR
                 // - audio HAL version is < 3.0
                 // - audio HAL version is >= 3.0 but no route has been declared between devices
-                // - called from startAudioSource (aka sourceDesc != nullptr) and source device does
-                //   not have a gain controller
+                // - called from startAudioSource (aka sourceDesc is not internal) and source device
+                //   does not have a gain controller
                 if (!srcDevice->hasSameHwModuleAs(sinkDevice) ||
                         (srcDevice->getModuleVersionMajor() < 3) ||
                         !srcDevice->getModule()->supportsPatch(srcDevice, sinkDevice) ||
-                        (sourceDesc != nullptr &&
+                        (!sourceDesc->isInternal() &&
                          srcDevice->getAudioPort()->getGains().size() == 0)) {
                     // support only one sink device for now to simplify output selection logic
                     if (patch->num_sinks > 1) {
                         return INVALID_OPERATION;
                     }
-                    if (sourceDesc == nullptr) {
-                        SortedVector<audio_io_handle_t> outputs =
-                                getOutputsForDevices(DeviceVector(sinkDevice), mOutputs);
-                        // if the sink device is reachable via an opened output stream, request to
-                        // go via this output stream by adding a second source to the patch
-                        // description
-                        output = selectOutput(outputs);
-                        if (output != AUDIO_IO_HANDLE_NONE) {
-                            outputDesc = mOutputs.valueFor(output);
-                            if (outputDesc->isDuplicated()) {
-                                ALOGV("%s output for device %s is duplicated",
-                                      __FUNCTION__, sinkDevice->toString().c_str());
-                                return INVALID_OPERATION;
-                            }
-                        }
-                    }
+                    sourceDesc->setUseSwBridge();
                     if (outputDesc != nullptr) {
                         audio_port_config srcMixPortConfig = {};
                         outputDesc->toAudioPortConfig(&srcMixPortConfig, nullptr);
                         // for volume control, we may need a valid stream
-                        srcMixPortConfig.ext.mix.usecase.stream = sourceDesc != nullptr ?
-                                    sourceDesc->stream() : AUDIO_STREAM_PATCH;
+                        srcMixPortConfig.ext.mix.usecase.stream = !sourceDesc->isInternal() ?
+                                    mEngine->getStreamTypeForAttributes(sourceDesc->attributes()) :
+                                    AUDIO_STREAM_PATCH;
                         patchBuilder.addSource(srcMixPortConfig);
                     }
                 }
@@ -4368,11 +4474,9 @@
     return NO_ERROR;
 }
 
-status_t AudioPolicyManager::releaseAudioPatch(audio_patch_handle_t handle,
-                                                  uid_t uid)
+status_t AudioPolicyManager::releaseAudioPatch(audio_patch_handle_t handle, uid_t uid)
 {
-    ALOGV("releaseAudioPatch() patch %d", handle);
-
+    ALOGV("%s patch %d", __func__, handle);
     ssize_t index = mAudioPatches.indexOfKey(handle);
 
     if (index < 0) {
@@ -4384,11 +4488,21 @@
     if (patchDesc->getUid() != mUidCached && uid != patchDesc->getUid()) {
         return INVALID_OPERATION;
     }
-    return releaseAudioPatchInternal(handle);
+    audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE;
+    for (size_t i = 0; i < mAudioSources.size(); i++)  {
+        sp<SourceClientDescriptor> sourceDesc = mAudioSources.valueAt(i);
+        if (sourceDesc != nullptr && sourceDesc->getPatchHandle() == handle) {
+            portId = sourceDesc->portId();
+            break;
+        }
+    }
+    return portId != AUDIO_PORT_HANDLE_NONE ?
+                stopAudioSource(portId) : releaseAudioPatchInternal(handle);
 }
 
 status_t AudioPolicyManager::releaseAudioPatchInternal(audio_patch_handle_t handle,
-                                                       uint32_t delayMs)
+                                                       uint32_t delayMs,
+                                                       const sp<SourceClientDescriptor>& sourceDesc)
 {
     ALOGV("%s patch %d", __func__, handle);
     if (mAudioPatches.indexOfKey(handle) < 0) {
@@ -4429,26 +4543,29 @@
             removeAudioPatch(patchDesc->getHandle());
             nextAudioPortGeneration();
             mpClientInterface->onAudioPatchListUpdate();
-            // SW Bridge
+            // SW or HW Bridge
+            sp<SwAudioOutputDescriptor> outputDesc = nullptr;
+            audio_patch_handle_t patchHandle = AUDIO_PATCH_HANDLE_NONE;
             if (patch->num_sources > 1 && patch->sources[1].type == AUDIO_PORT_TYPE_MIX) {
-                sp<SwAudioOutputDescriptor> outputDesc =
-                        mOutputs.getOutputFromId(patch->sources[1].id);
-                if (outputDesc == NULL) {
-                    ALOGW("%s output not found for id %d", __func__, patch->sources[0].id);
-                    // releaseOutput has already called closeOuput in case of direct output
-                    return NO_ERROR;
-                }
-                if (patchDesc->getHandle() != outputDesc->getPatchHandle()) {
-                    // force SwOutput patch removal as AF counter part patch has already gone.
-                    ALOGV("%s reset patch handle on Output as different from SWBridge", __func__);
-                    removeAudioPatch(outputDesc->getPatchHandle());
-                }
-                outputDesc->setPatchHandle(AUDIO_PATCH_HANDLE_NONE);
+                outputDesc = mOutputs.getOutputFromId(patch->sources[1].id);
+            } else if (patch->num_sources == 1 && sourceDesc != nullptr) {
+                outputDesc = sourceDesc->swOutput().promote();
+            }
+            if (outputDesc == nullptr) {
+                ALOGW("%s no output for id %d", __func__, patch->sources[0].id);
+                // releaseOutput has already called closeOutput in case of direct output
+                return NO_ERROR;
+            }
+            if (!outputDesc->isActive() && !sourceDesc->useSwBridge()) {
+                resetOutputDevice(outputDesc);
+            } else {
+                // Reuse patch handle if still valid / do not force rerouting if still routed
+                patchHandle = outputDesc->getPatchHandle();
                 setOutputDevices(outputDesc,
                                  getNewOutputDevices(outputDesc, true /*fromCache*/),
-                                 true, /*force*/
+                                 patchHandle == AUDIO_PATCH_HANDLE_NONE, /*force*/
                                  0,
-                                 NULL);
+                                 patchHandle == AUDIO_PATCH_HANDLE_NONE ? nullptr : &patchHandle);
             }
         } else {
             return BAD_VALUE;
@@ -4694,6 +4811,18 @@
     return status;
 }
 
+sp<SourceClientDescriptor> AudioPolicyManager::startAudioSourceInternal(
+        const struct audio_port_config *source, const audio_attributes_t *attributes, uid_t uid)
+{
+    ALOGV("%s", __FUNCTION__);
+    audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE;
+
+    status_t status = startAudioSource(source, attributes, &portId, uid);
+    ALOGE_IF(status != OK, "%s: failed to start audio source (%d)", __func__, status);
+    return mAudioSources.valueFor(portId);
+}
+
+
 status_t AudioPolicyManager::connectAudioSource(const sp<SourceClientDescriptor>& sourceDesc)
 {
     ALOGV("%s handle %d", __FUNCTION__, sourceDesc->portId());
@@ -4718,52 +4847,9 @@
     PatchBuilder patchBuilder;
     patchBuilder.addSink(sinkDevice).addSource(srcDevice);
     audio_patch_handle_t handle = AUDIO_PATCH_HANDLE_NONE;
-    status_t status =
-            createAudioPatchInternal(patchBuilder.patch(), &handle, mUidCached, 0, sourceDesc);
-    if (status != NO_ERROR || mAudioPatches.indexOfKey(handle) < 0) {
-        ALOGW("%s patch panel could not connect device patch, error %d", __func__, status);
-        return INVALID_OPERATION;
-    }
-    sourceDesc->connect(handle, sinkDevice);
-    // SW Bridge? (@todo: HW bridge, keep track of HwOutput for device selection "reconsideration")
-    sp<SwAudioOutputDescriptor> swOutput = sourceDesc->swOutput().promote();
-    if (swOutput != 0) {
-        status = swOutput->start();
-        if (status != NO_ERROR) {
-            goto FailureSourceAdded;
-        }
-        if (swOutput->getClient(sourceDesc->portId()) != nullptr) {
-            ALOGW("%s source portId has already been attached to outputDesc", __func__);
-            goto FailureReleasePatch;
-        }
-        swOutput->addClient(sourceDesc);
-        uint32_t delayMs = 0;
-        status = startSource(swOutput, sourceDesc, &delayMs);
-        if (status != NO_ERROR) {
-            ALOGW("%s failed to start source, error %d", __FUNCTION__, status);
-            goto FailureSourceActive;
-        }
-        if (delayMs != 0) {
-            usleep(delayMs * 1000);
-        }
-    } else {
-        sp<HwAudioOutputDescriptor> hwOutputDesc = sourceDesc->hwOutput().promote();
-        if (hwOutputDesc != 0) {
-          //   create Hwoutput and add to mHwOutputs
-        } else {
-            ALOGW("%s source has neither SW nor HW output", __FUNCTION__);
-        }
-    }
-    return NO_ERROR;
 
-FailureSourceActive:
-    swOutput->stop();
-    releaseOutput(sourceDesc->portId());
-FailureSourceAdded:
-    sourceDesc->setSwOutput(nullptr);
-FailureReleasePatch:
-    releaseAudioPatchInternal(handle);
-    return INVALID_OPERATION;
+    return connectAudioSourceToSink(
+                sourceDesc, sinkDevice, patchBuilder.patch(), handle, mUidCached, 0 /*delayMs*/);
 }
 
 status_t AudioPolicyManager::stopAudioSource(audio_port_handle_t portId)
@@ -5089,7 +5175,7 @@
             ALOGW("%s source has neither SW nor HW output", __FUNCTION__);
         }
     }
-    status_t status = releaseAudioPatchInternal(sourceDesc->getPatchHandle());
+    status_t status = releaseAudioPatchInternal(sourceDesc->getPatchHandle(), 0, sourceDesc);
     sourceDesc->disconnect();
     return status;
 }
@@ -6061,7 +6147,7 @@
         sp<SourceClientDescriptor> sourceDesc = mAudioSources.valueAt(i);
         if (sourceDesc != nullptr && followsSameRouting(attr, sourceDesc->attributes())
                 && sourceDesc->getPatchHandle() == AUDIO_PATCH_HANDLE_NONE
-                && !isCallRxAudioSource(sourceDesc)) {
+                && !isCallRxAudioSource(sourceDesc) && !sourceDesc->isInternal()) {
             connectAudioSource(sourceDesc);
         }
     }
@@ -6174,7 +6260,7 @@
                                 newDevices.types());
             }
             sp<SourceClientDescriptor> source = getSourceForAttributesOnOutput(srcOut, attr);
-            if (source != nullptr && !isCallRxAudioSource(source)) {
+            if (source != nullptr && !isCallRxAudioSource(source) && !source->isInternal()) {
                 connectAudioSource(source);
             }
         }
@@ -6708,6 +6794,8 @@
         muteWaitMs = 0;
     }
 
+    bool outputRouted = outputDesc->isRouted();
+
     // no need to proceed if new device is not AUDIO_DEVICE_NONE and not supported by current
     // output profile or if new device is not supported AND previous device(s) is(are) still
     // available (otherwise reset device must be done on the output)
@@ -6724,8 +6812,7 @@
     //  AND force is not specified
     //  AND the output is connected by a valid audio patch.
     // Doing this check here allows the caller to call setOutputDevices() without conditions
-    if ((filteredDevices.isEmpty() || filteredDevices == prevDevices) &&
-            !force && outputDesc->getPatchHandle() != AUDIO_PATCH_HANDLE_NONE) {
+    if ((filteredDevices.isEmpty() || filteredDevices == prevDevices) && !force && outputRouted) {
         ALOGV("%s setting same device %s or null device, force=%d, patch handle=%d", __func__,
               filteredDevices.toString().c_str(), force, outputDesc->getPatchHandle());
         if (requiresVolumeCheck && !filteredDevices.isEmpty()) {
@@ -6765,6 +6852,9 @@
                                                audio_patch_handle_t *patchHandle)
 {
     ssize_t index;
+    if (patchHandle == nullptr && !outputDesc->isRouted()) {
+        return INVALID_OPERATION;
+    }
     if (patchHandle) {
         index = mAudioPatches.indexOfKey(*patchHandle);
     } else {
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.h b/services/audiopolicy/managerdefault/AudioPolicyManager.h
index 4d307cf..6f8b897 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.h
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.h
@@ -263,10 +263,7 @@
         virtual status_t getAudioPort(struct audio_port_v7 *port);
         virtual status_t createAudioPatch(const struct audio_patch *patch,
                                            audio_patch_handle_t *handle,
-                                           uid_t uid) {
-            return createAudioPatchInternal(patch, handle, uid);
-        }
-
+                                           uid_t uid);
         virtual status_t releaseAudioPatch(audio_patch_handle_t handle,
                                               uid_t uid);
         virtual status_t listAudioPatches(unsigned int *num_patches,
@@ -638,13 +635,22 @@
         void updateCallAndOutputRouting(bool forceVolumeReeval = true, uint32_t delayMs = 0);
 
         bool isCallRxAudioSource(const sp<SourceClientDescriptor> &source) {
-            return mCallRxSourceClientPort != AUDIO_PORT_HANDLE_NONE
-                && source == mAudioSources.valueFor(mCallRxSourceClientPort);
+            return mCallRxSourceClient != nullptr && source == mCallRxSourceClient;
         }
 
         void connectTelephonyRxAudioSource();
 
-        void disconnectTelephonyRxAudioSource();
+        void disconnectTelephonyAudioSource(sp<SourceClientDescriptor> &clientDesc);
+
+        void connectTelephonyTxAudioSource(const sp<DeviceDescriptor> &srcdevice,
+                                           const sp<DeviceDescriptor> &sinkDevice,
+                                           uint32_t delayMs);
+
+        bool isTelephonyRxOrTx(const sp<SwAudioOutputDescriptor>& desc) const {
+            return (mCallRxSourceClient != nullptr && mCallRxSourceClient->belongsToOutput(desc))
+                    || (mCallTxSourceClient != nullptr
+                    &&  mCallTxSourceClient->belongsToOutput(desc));
+        }
 
         /**
          * @brief updates routing for all inputs.
@@ -851,6 +857,12 @@
         status_t connectAudioSource(const sp<SourceClientDescriptor>& sourceDesc);
         status_t disconnectAudioSource(const sp<SourceClientDescriptor>& sourceDesc);
 
+        status_t connectAudioSourceToSink(const sp<SourceClientDescriptor>& sourceDesc,
+                                          const sp<DeviceDescriptor> &sinkDevice,
+                                          const struct audio_patch *patch,
+                                          audio_patch_handle_t &handle,
+                                          uid_t uid, uint32_t delayMs);
+
         sp<SourceClientDescriptor> getSourceForAttributesOnOutput(audio_io_handle_t output,
                                                                   const audio_attributes_t &attr);
         void clearAudioSourcesForOutput(audio_io_handle_t output);
@@ -901,8 +913,6 @@
 
         SoundTriggerSessionCollection mSoundTriggerSessions;
 
-        sp<AudioPatch> mCallTxPatch;
-
         HwAudioOutputCollection mHwOutputs;
         SourceClientCollection mAudioSources;
 
@@ -943,7 +953,8 @@
 
         // The port handle of the hardware audio source created internally for the Call RX audio
         // end point.
-        audio_port_handle_t mCallRxSourceClientPort = AUDIO_PORT_HANDLE_NONE;
+        sp<SourceClientDescriptor> mCallRxSourceClient;
+        sp<SourceClientDescriptor> mCallTxSourceClient;
 
         // Support for Multi-Stream Decoder (MSD) module
         sp<DeviceDescriptor> getMsdAudioInDevice() const;
@@ -975,7 +986,13 @@
         // Called by setDeviceConnectionState()
         status_t deviceToAudioPort(audio_devices_t deviceType, const char* device_address,
                                    const char* device_name, media::AudioPort* aidPort);
+        bool isMsdPatch(const audio_patch_handle_t &handle) const;
+
 private:
+        sp<SourceClientDescriptor> startAudioSourceInternal(
+                const struct audio_port_config *source, const audio_attributes_t *attributes,
+                uid_t uid);
+
         void onNewAudioModulesAvailableInt(DeviceVector *newDevices);
 
         // Add or remove AC3 DTS encodings based on user preferences.
@@ -1120,21 +1137,25 @@
          * @param[out] handle patch handle to be provided if patch installed correctly
          * @param[in] uid of the client
          * @param[in] delayMs if required
-         * @param[in] sourceDesc [optional] in case of external source, source client to be
-         * configured by the patch, i.e. assigning an Output (HW or SW)
+         * @param[in] sourceDesc source client to be configured when creating the patch, i.e.
+         *            assigning an Output (HW or SW) used for volume control.
          * @return NO_ERROR if patch installed correctly, error code otherwise.
          */
         status_t createAudioPatchInternal(const struct audio_patch *patch,
                                           audio_patch_handle_t *handle,
-                                          uid_t uid, uint32_t delayMs = 0,
-                                          const sp<SourceClientDescriptor>& sourceDesc = nullptr);
+                                          uid_t uid, uint32_t delayMs,
+                                          const sp<SourceClientDescriptor>& sourceDesc);
         /**
          * @brief releaseAudioPatchInternal internal function to remove an audio patch
          * @param[in] handle of the patch to be removed
          * @param[in] delayMs if required
+         * @param[in] sourceDesc [optional] in case of external source, source client to be
+         * unrouted from the patch, i.e. assigning an Output (HW or SW)
          * @return NO_ERROR if patch removed correctly, error code otherwise.
          */
-        status_t releaseAudioPatchInternal(audio_patch_handle_t handle, uint32_t delayMs = 0);
+        status_t releaseAudioPatchInternal(audio_patch_handle_t handle,
+                                           uint32_t delayMs = 0,
+                                           const sp<SourceClientDescriptor>& sourceDesc = nullptr);
 
         status_t installPatch(const char *caller,
                 audio_patch_handle_t *patchHandle,