Merge "Refactor opening output interface between AF and AP."
diff --git a/media/libaudioclient/Android.bp b/media/libaudioclient/Android.bp
index 32904bb..ad79e9c 100644
--- a/media/libaudioclient/Android.bp
+++ b/media/libaudioclient/Android.bp
@@ -1,7 +1,15 @@
 cc_library_headers {
     name: "libaudioclient_headers",
     vendor_available: true,
-    export_include_dirs: ["include"],
+    header_libs: [
+        "libaudiofoundation_headers",
+    ],
+    export_include_dirs: [
+        "include",
+    ],
+    export_header_lib_headers: [
+        "libaudiofoundation_headers",
+    ],
 }
 
 cc_library_shared {
@@ -63,6 +71,7 @@
         "TrackPlayerBase.cpp",
     ],
     shared_libs: [
+        "libaudiofoundation",
         "libaudioutils",
         "libaudiopolicy",
         "libaudiomanager",
diff --git a/media/libaudioclient/IAudioFlinger.cpp b/media/libaudioclient/IAudioFlinger.cpp
index 46cfb68..6e9a7cf 100644
--- a/media/libaudioclient/IAudioFlinger.cpp
+++ b/media/libaudioclient/IAudioFlinger.cpp
@@ -392,20 +392,18 @@
     virtual status_t openOutput(audio_module_handle_t module,
                                 audio_io_handle_t *output,
                                 audio_config_t *config,
-                                audio_devices_t *devices,
-                                const String8& address,
+                                const sp<DeviceDescriptorBase>& device,
                                 uint32_t *latencyMs,
                                 audio_output_flags_t flags)
     {
-        if (output == NULL || config == NULL || devices == NULL || latencyMs == NULL) {
+        if (output == nullptr || config == nullptr || device == nullptr || latencyMs == nullptr) {
             return BAD_VALUE;
         }
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32(module);
         data.write(config, sizeof(audio_config_t));
-        data.writeInt32(*devices);
-        data.writeString8(address);
+        data.writeParcelable(*device);
         data.writeInt32((int32_t) flags);
         status_t status = remote()->transact(OPEN_OUTPUT, data, &reply);
         if (status != NO_ERROR) {
@@ -420,7 +418,6 @@
         *output = (audio_io_handle_t)reply.readInt32();
         ALOGV("openOutput() returned output, %d", *output);
         reply.read(config, sizeof(audio_config_t));
-        *devices = (audio_devices_t)reply.readInt32();
         *latencyMs = reply.readInt32();
         return NO_ERROR;
     }
@@ -1198,19 +1195,21 @@
             if (data.read(&config, sizeof(audio_config_t)) != NO_ERROR) {
                 ALOGE("b/23905951");
             }
-            audio_devices_t devices = (audio_devices_t)data.readInt32();
-            String8 address(data.readString8());
+            sp<DeviceDescriptorBase> device = new DeviceDescriptorBase(AUDIO_DEVICE_NONE);
+            status_t status = NO_ERROR;
+            if ((status = data.readParcelable(device.get())) != NO_ERROR) {
+                reply->writeInt32((int32_t)status);
+                return NO_ERROR;
+            }
             audio_output_flags_t flags = (audio_output_flags_t) data.readInt32();
             uint32_t latencyMs = 0;
             audio_io_handle_t output = AUDIO_IO_HANDLE_NONE;
-            status_t status = openOutput(module, &output, &config,
-                                         &devices, address, &latencyMs, flags);
+            status = openOutput(module, &output, &config, device, &latencyMs, flags);
             ALOGV("OPEN_OUTPUT output, %d", output);
             reply->writeInt32((int32_t)status);
             if (status == NO_ERROR) {
                 reply->writeInt32((int32_t)output);
                 reply->write(&config, sizeof(audio_config_t));
-                reply->writeInt32(devices);
                 reply->writeInt32(latencyMs);
             }
             return NO_ERROR;
diff --git a/media/libaudioclient/include/media/IAudioFlinger.h b/media/libaudioclient/include/media/IAudioFlinger.h
index b580a88..0a65857 100644
--- a/media/libaudioclient/include/media/IAudioFlinger.h
+++ b/media/libaudioclient/include/media/IAudioFlinger.h
@@ -27,6 +27,7 @@
 #include <binder/Parcel.h>
 #include <binder/Parcelable.h>
 #include <media/AudioClient.h>
+#include <media/DeviceDescriptorBase.h>
 #include <media/IAudioTrack.h>
 #include <media/IAudioFlingerClient.h>
 #include <system/audio.h>
@@ -416,8 +417,7 @@
     virtual status_t openOutput(audio_module_handle_t module,
                                 audio_io_handle_t *output,
                                 audio_config_t *config,
-                                audio_devices_t *devices,
-                                const String8& address,
+                                const sp<DeviceDescriptorBase>& device,
                                 uint32_t *latencyMs,
                                 audio_output_flags_t flags) = 0;
     virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1,
diff --git a/media/libaudiofoundation/Android.bp b/media/libaudiofoundation/Android.bp
index 1df0d16..edc06d2 100644
--- a/media/libaudiofoundation/Android.bp
+++ b/media/libaudiofoundation/Android.bp
@@ -15,6 +15,7 @@
 cc_library {
     name: "libaudiofoundation",
     vendor_available: true,
+    double_loadable: true,
 
     srcs: [
         "AudioContainers.cpp",
diff --git a/media/libaudiofoundation/include/media/AudioContainers.h b/media/libaudiofoundation/include/media/AudioContainers.h
index 8347c71..05e68fa 100644
--- a/media/libaudiofoundation/include/media/AudioContainers.h
+++ b/media/libaudiofoundation/include/media/AudioContainers.h
@@ -17,6 +17,7 @@
 #pragma once
 
 #include <algorithm>
+#include <functional>
 #include <iterator>
 #include <set>
 #include <vector>
@@ -78,6 +79,11 @@
     return deviceTypes.size() == 1 && p(*(deviceTypes.begin()));
 }
 
+static inline bool areAllOfSameDeviceType(const DeviceTypeSet& deviceTypes,
+                                          std::function<bool(audio_devices_t)> p) {
+    return std::all_of(deviceTypes.begin(), deviceTypes.end(), p);
+}
+
 static inline void resetDeviceTypes(DeviceTypeSet& deviceTypes, audio_devices_t typeToAdd) {
     deviceTypes.clear();
     deviceTypes.insert(typeToAdd);
diff --git a/media/libaudiohal/impl/DeviceHalHidl.cpp b/media/libaudiohal/impl/DeviceHalHidl.cpp
index b07f21d..3d3a5eb 100644
--- a/media/libaudiohal/impl/DeviceHalHidl.cpp
+++ b/media/libaudiohal/impl/DeviceHalHidl.cpp
@@ -229,14 +229,14 @@
 
 status_t DeviceHalHidl::openOutputStream(
         audio_io_handle_t handle,
-        audio_devices_t devices,
+        audio_devices_t deviceType,
         audio_output_flags_t flags,
         struct audio_config *config,
         const char *address,
         sp<StreamOutHalInterface> *outStream) {
     if (mDevice == 0) return NO_INIT;
     DeviceAddress hidlDevice;
-    status_t status = deviceAddressFromHal(devices, address, &hidlDevice);
+    status_t status = deviceAddressFromHal(deviceType, address, &hidlDevice);
     if (status != OK) return status;
     AudioConfig hidlConfig;
     HidlUtils::audioConfigFromHal(*config, &hidlConfig);
diff --git a/media/libaudiohal/impl/DeviceHalLocal.cpp b/media/libaudiohal/impl/DeviceHalLocal.cpp
index ee68252..dfbb6b2 100644
--- a/media/libaudiohal/impl/DeviceHalLocal.cpp
+++ b/media/libaudiohal/impl/DeviceHalLocal.cpp
@@ -104,7 +104,7 @@
 
 status_t DeviceHalLocal::openOutputStream(
         audio_io_handle_t handle,
-        audio_devices_t devices,
+        audio_devices_t deviceType,
         audio_output_flags_t flags,
         struct audio_config *config,
         const char *address,
@@ -112,11 +112,11 @@
     audio_stream_out_t *halStream;
     ALOGV("open_output_stream handle: %d devices: %x flags: %#x"
             "srate: %d format %#x channels %x address %s",
-            handle, devices, flags,
+            handle, deviceType, flags,
             config->sample_rate, config->format, config->channel_mask,
             address);
     int openResut = mDev->open_output_stream(
-            mDev, handle, devices, flags, config, &halStream, address);
+            mDev, handle, deviceType, flags, config, &halStream, address);
     if (openResut == OK) {
         *outStream = new StreamOutHalLocal(halStream, this);
     }
diff --git a/media/libaudiohal/include/media/audiohal/DeviceHalInterface.h b/media/libaudiohal/include/media/audiohal/DeviceHalInterface.h
index e565237..2200a7f 100644
--- a/media/libaudiohal/include/media/audiohal/DeviceHalInterface.h
+++ b/media/libaudiohal/include/media/audiohal/DeviceHalInterface.h
@@ -69,7 +69,7 @@
     // by releasing all references to the returned object.
     virtual status_t openOutputStream(
             audio_io_handle_t handle,
-            audio_devices_t devices,
+            audio_devices_t deviceType,
             audio_output_flags_t flags,
             struct audio_config *config,
             const char *address,
diff --git a/services/audioflinger/Android.bp b/services/audioflinger/Android.bp
index d50a556..de8c7e7 100644
--- a/services/audioflinger/Android.bp
+++ b/services/audioflinger/Android.bp
@@ -34,6 +34,7 @@
     ],
 
     shared_libs: [
+        "libaudiofoundation",
         "libaudiohal",
         "libaudioprocessing",
         "libaudiospdif",
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 65261da..eba0b20 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -381,7 +381,7 @@
 
 AudioHwDevice* AudioFlinger::findSuitableHwDev_l(
         audio_module_handle_t module,
-        audio_devices_t devices)
+        audio_devices_t deviceType)
 {
     // if module is 0, the request comes from an old policy manager and we should load
     // well known modules
@@ -396,7 +396,7 @@
             sp<DeviceHalInterface> dev = audioHwDevice->hwDevice();
             uint32_t supportedDevices;
             if (dev->getSupportedDevices(&supportedDevices) == OK &&
-                    (supportedDevices & devices) == devices) {
+                    (supportedDevices & deviceType) == deviceType) {
                 return audioHwDevice;
             }
         }
@@ -2304,13 +2304,13 @@
 
 
 sp<AudioFlinger::ThreadBase> AudioFlinger::openOutput_l(audio_module_handle_t module,
-                                                            audio_io_handle_t *output,
-                                                            audio_config_t *config,
-                                                            audio_devices_t devices,
-                                                            const String8& address,
-                                                            audio_output_flags_t flags)
+                                                        audio_io_handle_t *output,
+                                                        audio_config_t *config,
+                                                        audio_devices_t deviceType,
+                                                        const String8& address,
+                                                        audio_output_flags_t flags)
 {
-    AudioHwDevice *outHwDev = findSuitableHwDev_l(module, devices);
+    AudioHwDevice *outHwDev = findSuitableHwDev_l(module, deviceType);
     if (outHwDev == NULL) {
         return 0;
     }
@@ -2351,7 +2351,7 @@
     status_t status = outHwDev->openOutputStream(
             &outputStream,
             *output,
-            devices,
+            deviceType,
             flags,
             config,
             address.string());
@@ -2362,7 +2362,7 @@
         if (flags & AUDIO_OUTPUT_FLAG_MMAP_NOIRQ) {
             sp<MmapPlaybackThread> thread =
                     new MmapPlaybackThread(this, *output, outHwDev, outputStream,
-                                          devices, AUDIO_DEVICE_NONE, mSystemReady);
+                                           deviceType, AUDIO_DEVICE_NONE, mSystemReady);
             mMmapThreads.add(*output, thread);
             ALOGV("openOutput_l() created mmap playback thread: ID %d thread %p",
                   *output, thread.get());
@@ -2370,17 +2370,18 @@
         } else {
             sp<PlaybackThread> thread;
             if (flags & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) {
-                thread = new OffloadThread(this, outputStream, *output, devices, mSystemReady);
+                thread = new OffloadThread(this, outputStream, *output, deviceType, mSystemReady);
                 ALOGV("openOutput_l() created offload output: ID %d thread %p",
                       *output, thread.get());
             } else if ((flags & AUDIO_OUTPUT_FLAG_DIRECT)
                     || !isValidPcmSinkFormat(config->format)
                     || !isValidPcmSinkChannelMask(config->channel_mask)) {
-                thread = new DirectOutputThread(this, outputStream, *output, devices, mSystemReady);
+                thread = new DirectOutputThread(
+                        this, outputStream, *output, deviceType, mSystemReady);
                 ALOGV("openOutput_l() created direct output: ID %d thread %p",
                       *output, thread.get());
             } else {
-                thread = new MixerThread(this, outputStream, *output, devices, mSystemReady);
+                thread = new MixerThread(this, outputStream, *output, deviceType, mSystemReady);
                 ALOGV("openOutput_l() created mixer output: ID %d thread %p",
                       *output, thread.get());
             }
@@ -2396,27 +2397,29 @@
 status_t AudioFlinger::openOutput(audio_module_handle_t module,
                                   audio_io_handle_t *output,
                                   audio_config_t *config,
-                                  audio_devices_t *devices,
-                                  const String8& address,
+                                  const sp<DeviceDescriptorBase>& device,
                                   uint32_t *latencyMs,
                                   audio_output_flags_t flags)
 {
-    ALOGI("openOutput() this %p, module %d Device %#x, SamplingRate %d, Format %#08x, "
+    ALOGI("openOutput() this %p, module %d Device %s, SamplingRate %d, Format %#08x, "
               "Channels %#x, flags %#x",
               this, module,
-              (devices != NULL) ? *devices : 0,
+              device->toString().c_str(),
               config->sample_rate,
               config->format,
               config->channel_mask,
               flags);
 
-    if (devices == NULL || *devices == AUDIO_DEVICE_NONE) {
+    audio_devices_t deviceType = device->type();
+    const String8 address = String8(device->address().c_str());
+
+    if (deviceType == AUDIO_DEVICE_NONE) {
         return BAD_VALUE;
     }
 
     Mutex::Autolock _l(mLock);
 
-    sp<ThreadBase> thread = openOutput_l(module, output, config, *devices, address, flags);
+    sp<ThreadBase> thread = openOutput_l(module, output, config, deviceType, address, flags);
     if (thread != 0) {
         if ((flags & AUDIO_OUTPUT_FLAG_MMAP_NOIRQ) == 0) {
             PlaybackThread *playbackThread = (PlaybackThread *)thread.get();
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index d2de5fe..65be06d 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -175,8 +175,7 @@
     virtual status_t openOutput(audio_module_handle_t module,
                                 audio_io_handle_t *output,
                                 audio_config_t *config,
-                                audio_devices_t *devices,
-                                const String8& address,
+                                const sp<DeviceDescriptorBase>& device,
                                 uint32_t *latencyMs,
                                 audio_output_flags_t flags);
 
@@ -372,7 +371,7 @@
     virtual     void        onFirstRef();
 
     AudioHwDevice*          findSuitableHwDev_l(audio_module_handle_t module,
-                                                audio_devices_t devices);
+                                                audio_devices_t deviceType);
 
     // Set kEnableExtendedChannels to true to enable greater than stereo output
     // for the MixerThread and device sink.  Number of channels allowed is
@@ -678,11 +677,11 @@
                                            audio_devices_t outputDevice,
                                            const String8& outputDeviceAddress);
               sp<ThreadBase> openOutput_l(audio_module_handle_t module,
-                                              audio_io_handle_t *output,
-                                              audio_config_t *config,
-                                              audio_devices_t devices,
-                                              const String8& address,
-                                              audio_output_flags_t flags);
+                                          audio_io_handle_t *output,
+                                          audio_config_t *config,
+                                          audio_devices_t deviceType,
+                                          const String8& address,
+                                          audio_output_flags_t flags);
 
               void closeOutputFinish(const sp<PlaybackThread>& thread);
               void closeInputFinish(const sp<RecordThread>& thread);
diff --git a/services/audioflinger/AudioHwDevice.cpp b/services/audioflinger/AudioHwDevice.cpp
index b109d06..dda164c 100644
--- a/services/audioflinger/AudioHwDevice.cpp
+++ b/services/audioflinger/AudioHwDevice.cpp
@@ -34,7 +34,7 @@
 status_t AudioHwDevice::openOutputStream(
         AudioStreamOut **ppStreamOut,
         audio_io_handle_t handle,
-        audio_devices_t devices,
+        audio_devices_t deviceType,
         audio_output_flags_t flags,
         struct audio_config *config,
         const char *address)
@@ -50,7 +50,7 @@
             config->sample_rate,
             config->format,
             config->channel_mask);
-    status_t status = outputStream->open(handle, devices, config, address);
+    status_t status = outputStream->open(handle, deviceType, config, address);
 
     if (status != NO_ERROR) {
         delete outputStream;
@@ -75,7 +75,7 @@
         if (wrapperNeeded) {
             if (SPDIFEncoder::isFormatSupported(originalConfig.format)) {
                 outputStream = new SpdifStreamOut(this, flags, originalConfig.format);
-                status = outputStream->open(handle, devices, &originalConfig, address);
+                status = outputStream->open(handle, deviceType, &originalConfig, address);
                 if (status != NO_ERROR) {
                     ALOGE("ERROR - openOutputStream(), SPDIF open returned %d",
                         status);
diff --git a/services/audioflinger/AudioHwDevice.h b/services/audioflinger/AudioHwDevice.h
index d4299b0..6709d17 100644
--- a/services/audioflinger/AudioHwDevice.h
+++ b/services/audioflinger/AudioHwDevice.h
@@ -76,7 +76,7 @@
     status_t openOutputStream(
             AudioStreamOut **ppStreamOut,
             audio_io_handle_t handle,
-            audio_devices_t devices,
+            audio_devices_t deviceType,
             audio_output_flags_t flags,
             struct audio_config *config,
             const char *address);
diff --git a/services/audioflinger/AudioStreamOut.cpp b/services/audioflinger/AudioStreamOut.cpp
index a60a5f2..d13cb8f 100644
--- a/services/audioflinger/AudioStreamOut.cpp
+++ b/services/audioflinger/AudioStreamOut.cpp
@@ -118,7 +118,7 @@
 
 status_t AudioStreamOut::open(
         audio_io_handle_t handle,
-        audio_devices_t devices,
+        audio_devices_t deviceType,
         struct audio_config *config,
         const char *address)
 {
@@ -130,7 +130,7 @@
 
     int status = hwDev()->openOutputStream(
             handle,
-            devices,
+            deviceType,
             customFlags,
             config,
             address,
@@ -152,7 +152,7 @@
 
         status = hwDev()->openOutputStream(
                 handle,
-                devices,
+                deviceType,
                 customFlags,
                 &customConfig,
                 address,
diff --git a/services/audioflinger/AudioStreamOut.h b/services/audioflinger/AudioStreamOut.h
index b16b1af..16fbcf2 100644
--- a/services/audioflinger/AudioStreamOut.h
+++ b/services/audioflinger/AudioStreamOut.h
@@ -47,7 +47,7 @@
 
     virtual status_t open(
             audio_io_handle_t handle,
-            audio_devices_t devices,
+            audio_devices_t deviceType,
             struct audio_config *config,
             const char *address);
 
diff --git a/services/audiopolicy/AudioPolicyInterface.h b/services/audiopolicy/AudioPolicyInterface.h
index 35126ad..0d3e614 100644
--- a/services/audiopolicy/AudioPolicyInterface.h
+++ b/services/audiopolicy/AudioPolicyInterface.h
@@ -19,6 +19,7 @@
 
 #include <media/AudioSystem.h>
 #include <media/AudioPolicy.h>
+#include <media/DeviceDescriptorBase.h>
 #include <utils/String8.h>
 
 namespace android {
@@ -296,8 +297,7 @@
     virtual status_t openOutput(audio_module_handle_t module,
                                 audio_io_handle_t *output,
                                 audio_config_t *config,
-                                audio_devices_t *devices,
-                                const String8& address,
+                                const sp<DeviceDescriptorBase>& device,
                                 uint32_t *latencyMs,
                                 audio_output_flags_t flags) = 0;
     // creates a special output that is duplicated to the two outputs passed as arguments. The duplication is performed by
diff --git a/services/audiopolicy/common/include/Volume.h b/services/audiopolicy/common/include/Volume.h
index c3a02f9..7c8ce83 100644
--- a/services/audiopolicy/common/include/Volume.h
+++ b/services/audiopolicy/common/include/Volume.h
@@ -22,6 +22,8 @@
 #include <utils/Log.h>
 #include <math.h>
 
+#include "policy.h"
+
 namespace android {
 
 /**
@@ -85,43 +87,14 @@
      */
     static audio_devices_t getDeviceForVolume(const android::DeviceTypeSet& deviceTypes)
     {
-        audio_devices_t deviceType = AUDIO_DEVICE_NONE;
         if (deviceTypes.empty()) {
             // this happens when forcing a route update and no track is active on an output.
             // In this case the returned category is not important.
-            deviceType = AUDIO_DEVICE_OUT_SPEAKER;
-        } else if (deviceTypes.size() > 1) {
-            // Multiple device selection is either:
-            //  - speaker + one other device: give priority to speaker in this case.
-            //  - one A2DP device + another device: happens with duplicated output. In this case
-            // retain the device on the A2DP output as the other must not correspond to an active
-            // selection if not the speaker.
-            //  - HDMI-CEC system audio mode only output: give priority to available item in order.
-            if (deviceTypes.count(AUDIO_DEVICE_OUT_SPEAKER) != 0) {
-                deviceType = AUDIO_DEVICE_OUT_SPEAKER;
-            } else if (deviceTypes.count(AUDIO_DEVICE_OUT_SPEAKER_SAFE) != 0) {
-                deviceType = AUDIO_DEVICE_OUT_SPEAKER_SAFE;
-            } else if (deviceTypes.count(AUDIO_DEVICE_OUT_HDMI_ARC) != 0) {
-                deviceType = AUDIO_DEVICE_OUT_HDMI_ARC;
-            } else if (deviceTypes.count(AUDIO_DEVICE_OUT_AUX_LINE) != 0) {
-                deviceType = AUDIO_DEVICE_OUT_AUX_LINE;
-            } else if (deviceTypes.count(AUDIO_DEVICE_OUT_SPDIF) != 0) {
-                deviceType = AUDIO_DEVICE_OUT_SPDIF;
-            } else {
-                std::vector<audio_devices_t> a2dpDevices = android::Intersection(
-                        deviceTypes, android::getAudioDeviceOutAllA2dpSet());
-                if (a2dpDevices.size() > 1) {
-                    ALOGW("getDeviceForVolume() invalid device combination: %s",
-                          android::dumpDeviceTypes(deviceTypes).c_str());
-                }
-                if (!a2dpDevices.empty()) {
-                    deviceType = a2dpDevices[0];
-                }
-            }
-        } else {
-            deviceType = *(deviceTypes.begin());
+            return AUDIO_DEVICE_OUT_SPEAKER;
         }
 
+        audio_devices_t deviceType = apm_extract_one_audio_device(deviceTypes);
+
         /*SPEAKER_SAFE is an alias of SPEAKER for purposes of volume control*/
         if (deviceType == AUDIO_DEVICE_OUT_SPEAKER_SAFE) {
             deviceType = AUDIO_DEVICE_OUT_SPEAKER;
diff --git a/services/audiopolicy/common/include/policy.h b/services/audiopolicy/common/include/policy.h
index 630efc1..0537365 100644
--- a/services/audiopolicy/common/include/policy.h
+++ b/services/audiopolicy/common/include/policy.h
@@ -19,6 +19,8 @@
 #include <system/audio.h>
 #include <vector>
 
+#include <media/AudioContainers.h>
+
 namespace android {
 
 using StreamTypeVector = std::vector<audio_stream_type_t>;
@@ -199,3 +201,43 @@
 {
     return hasStream(streams, AUDIO_STREAM_VOICE_CALL);
 }
+
+/**
+ * @brief extract one device relevant from multiple device selection
+ * @param deviceTypes collection of audio device type
+ * @return the device type that is selected
+ */
+static inline audio_devices_t apm_extract_one_audio_device(
+        const android::DeviceTypeSet& deviceTypes) {
+    if (deviceTypes.empty()) {
+        return AUDIO_DEVICE_NONE;
+    } else if (deviceTypes.size() == 1) {
+        return *(deviceTypes.begin());
+    } else {
+        // Multiple device selection is either:
+        //  - speaker + one other device: give priority to speaker in this case.
+        //  - one A2DP device + another device: happens with duplicated output. In this case
+        // retain the device on the A2DP output as the other must not correspond to an active
+        // selection if not the speaker.
+        //  - HDMI-CEC system audio mode only output: give priority to available item in order.
+        if (deviceTypes.count(AUDIO_DEVICE_OUT_SPEAKER) != 0) {
+            return AUDIO_DEVICE_OUT_SPEAKER;
+        } else if (deviceTypes.count(AUDIO_DEVICE_OUT_SPEAKER_SAFE) != 0) {
+            return AUDIO_DEVICE_OUT_SPEAKER_SAFE;
+        } else if (deviceTypes.count(AUDIO_DEVICE_OUT_HDMI_ARC) != 0) {
+            return AUDIO_DEVICE_OUT_HDMI_ARC;
+        } else if (deviceTypes.count(AUDIO_DEVICE_OUT_AUX_LINE) != 0) {
+            return AUDIO_DEVICE_OUT_AUX_LINE;
+        } else if (deviceTypes.count(AUDIO_DEVICE_OUT_SPDIF) != 0) {
+            return AUDIO_DEVICE_OUT_SPDIF;
+        } else {
+            std::vector<audio_devices_t> a2dpDevices = android::Intersection(
+                    deviceTypes, android::getAudioDeviceOutAllA2dpSet());
+            if (a2dpDevices.empty() || a2dpDevices.size() > 1) {
+                ALOGW("%s invalid device combination: %s",
+                      __func__, android::dumpDeviceTypes(deviceTypes).c_str());
+            }
+            return a2dpDevices.empty() ? AUDIO_DEVICE_NONE : a2dpDevices[0];
+        }
+    }
+}
\ No newline at end of file
diff --git a/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h b/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
index 158215d..7faf90e 100644
--- a/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
+++ b/services/audiopolicy/common/managerdefinitions/include/DeviceDescriptor.h
@@ -130,6 +130,14 @@
     DeviceVector getFirstDevicesFromTypes(std::vector<audio_devices_t> orderedTypes) const;
     sp<DeviceDescriptor> getFirstExistingDevice(std::vector<audio_devices_t> orderedTypes) const;
 
+    // Return device descriptor that is used to open an input/output stream.
+    // Null pointer will be returned if
+    //     1) this collection is empty
+    //     2) the device descriptors are not the same category(input or output)
+    //     3) there are more than one device type for input case
+    //     4) the combination of all devices is invalid for selection
+    sp<DeviceDescriptor> getDeviceForOpening() const;
+
     // If there are devices with the given type and the devices to add is not empty,
     // remove all the devices with the given type and add all the devices to add.
     void replaceDevicesByType(audio_devices_t typeToRemove, const DeviceVector &devicesToAdd);
diff --git a/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp b/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp
index 4ff69ee..dd51658 100644
--- a/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/AudioOutputDescriptor.cpp
@@ -467,8 +467,11 @@
                                        audio_io_handle_t *output)
 {
     mDevices = devices;
-    const String8& address = devices.getFirstValidAddress();
-    DeviceTypeSet deviceTypes = devices.types();
+    sp<DeviceDescriptor> device = devices.getDeviceForOpening();
+    LOG_ALWAYS_FATAL_IF(device == nullptr,
+                        "%s failed to get device descriptor for opening "
+                        "with the requested devices, all device types: %s",
+                        __func__, dumpDeviceTypes(devices.types()).c_str());
 
     audio_config_t lConfig;
     if (config == nullptr) {
@@ -500,25 +503,19 @@
     ALOGV("opening output for device %s profile %p name %s",
           mDevices.toString().c_str(), mProfile.get(), mProfile->getName().c_str());
 
-    // FIXME: Stop using device types as bit mask when the interface updated.
-    audio_devices_t deviceType = deviceTypesToBitMask(deviceTypes);
     status_t status = mClientInterface->openOutput(mProfile->getModuleHandle(),
                                                    output,
                                                    &lConfig,
-                                                   &deviceType,
-                                                   address,
+                                                   device,
                                                    &mLatency,
                                                    mFlags);
-    deviceTypes = deviceTypesFromBitMask(deviceType);
-    LOG_ALWAYS_FATAL_IF(mDevices.types() != deviceTypes,
-                        "%s openOutput returned device %s when given device %s",
-                        __FUNCTION__, dumpDeviceTypes(mDevices.types()).c_str(),
-                        dumpDeviceTypes(deviceTypes).c_str());
 
     if (status == NO_ERROR) {
         LOG_ALWAYS_FATAL_IF(*output == AUDIO_IO_HANDLE_NONE,
-                            "%s openOutput returned output handle %d for device %s",
-                            __FUNCTION__, *output, dumpDeviceTypes(deviceTypes).c_str());
+                            "%s openOutput returned output handle %d for device %s, "
+                            "selected device %s for opening",
+                            __FUNCTION__, *output, devices.toString().c_str(),
+                            device->toString().c_str());
         mSamplingRate = lConfig.sample_rate;
         mChannelMask = lConfig.channel_mask;
         mFormat = lConfig.format;
diff --git a/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp b/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp
index 4e8c01c..0587041 100644
--- a/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/DeviceDescriptor.cpp
@@ -328,6 +328,24 @@
     return device;
 }
 
+sp<DeviceDescriptor> DeviceVector::getDeviceForOpening() const
+{
+    if (isEmpty()) {
+        // Return nullptr if this collection is empty.
+        return nullptr;
+    } else if (areAllOfSameDeviceType(types(), audio_is_input_device)) {
+        // For input case, return the first one when there is only one device.
+        return size() > 1 ? nullptr : *begin();
+    } else if (areAllOfSameDeviceType(types(), audio_is_output_device)) {
+        // For output case, return the device descriptor according to apm strategy.
+        audio_devices_t deviceType = apm_extract_one_audio_device(types());
+        return deviceType == AUDIO_DEVICE_NONE ? nullptr :
+                getDevice(deviceType, String8(""), AUDIO_FORMAT_DEFAULT);
+    }
+    // Return null pointer if the devices are not all input/output device.
+    return nullptr;
+}
+
 void DeviceVector::replaceDevicesByType(
         audio_devices_t typeToRemove, const DeviceVector &devicesToAdd) {
     DeviceVector devicesToRemove = getDevicesFromType(typeToRemove);
diff --git a/services/audiopolicy/service/AudioPolicyClientImpl.cpp b/services/audiopolicy/service/AudioPolicyClientImpl.cpp
index d51cc6e..6de0c80 100644
--- a/services/audiopolicy/service/AudioPolicyClientImpl.cpp
+++ b/services/audiopolicy/service/AudioPolicyClientImpl.cpp
@@ -39,8 +39,7 @@
 status_t AudioPolicyService::AudioPolicyClient::openOutput(audio_module_handle_t module,
                                                            audio_io_handle_t *output,
                                                            audio_config_t *config,
-                                                           audio_devices_t *devices,
-                                                           const String8& address,
+                                                           const sp<DeviceDescriptorBase>& device,
                                                            uint32_t *latencyMs,
                                                            audio_output_flags_t flags)
 {
@@ -49,7 +48,7 @@
         ALOGW("%s: could not get AudioFlinger", __func__);
         return PERMISSION_DENIED;
     }
-    return af->openOutput(module, output, config, devices, address, latencyMs, flags);
+    return af->openOutput(module, output, config, device, latencyMs, flags);
 }
 
 audio_io_handle_t AudioPolicyService::AudioPolicyClient::openDuplicateOutput(
diff --git a/services/audiopolicy/service/AudioPolicyService.h b/services/audiopolicy/service/AudioPolicyService.h
index 939df2c..175fed4 100644
--- a/services/audiopolicy/service/AudioPolicyService.h
+++ b/services/audiopolicy/service/AudioPolicyService.h
@@ -622,8 +622,7 @@
         virtual status_t openOutput(audio_module_handle_t module,
                                     audio_io_handle_t *output,
                                     audio_config_t *config,
-                                    audio_devices_t *devices,
-                                    const String8& address,
+                                    const sp<DeviceDescriptorBase>& device,
                                     uint32_t *latencyMs,
                                     audio_output_flags_t flags);
         // creates a special output that is duplicated to the two outputs passed as arguments. The duplication is performed by
diff --git a/services/audiopolicy/tests/AudioPolicyManagerTestClient.h b/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
index afe6f20..c2a92d7 100644
--- a/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
+++ b/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
@@ -34,8 +34,7 @@
     status_t openOutput(audio_module_handle_t module,
                         audio_io_handle_t *output,
                         audio_config_t * /*config*/,
-                        audio_devices_t * /*devices*/,
-                        const String8 & /*address*/,
+                        const sp<DeviceDescriptorBase>& /*device*/,
                         uint32_t * /*latencyMs*/,
                         audio_output_flags_t /*flags*/) override {
         if (module >= mNextModuleHandle) {
diff --git a/services/audiopolicy/tests/AudioPolicyTestClient.h b/services/audiopolicy/tests/AudioPolicyTestClient.h
index e4c64e5..b92a2e6 100644
--- a/services/audiopolicy/tests/AudioPolicyTestClient.h
+++ b/services/audiopolicy/tests/AudioPolicyTestClient.h
@@ -31,8 +31,7 @@
     status_t openOutput(audio_module_handle_t /*module*/,
                         audio_io_handle_t* /*output*/,
                         audio_config_t* /*config*/,
-                        audio_devices_t* /*devices*/,
-                        const String8& /*address*/,
+                        const sp<DeviceDescriptorBase>& /*device*/,
                         uint32_t* /*latencyMs*/,
                         audio_output_flags_t /*flags*/) override { return NO_INIT; }
     audio_io_handle_t openDuplicateOutput(audio_io_handle_t /*output1*/,