Refactor opening output interface between AF and AP.

Refactor interface between audio flinger and audio policy. Use device
descriptor instead of audio device type and address. DeviceDescriptor
can contain more information that may be useful when opening an output
stream.
In audio policy, if multiple audio devices are passed in when opening
an output stream, one device is extracted using the same strategy as
when selecting a device for volume application. When starting source,
audio policy manager will call audio flinger to create audio patch. In
that case, multiple devices will still be patched to the output stream.

Test: atest AudioTrackTest AudioPlaybackCaptureTest
Test: atest audiopolicy_tests, audio smoke test
Change-Id: I46dc2da621614f8716c6c73cf807fe7d2d672cda
diff --git a/media/libaudioclient/Android.bp b/media/libaudioclient/Android.bp
index c516d20..2752ba6 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*/,