Update Audio Policy Manager for remote submix

Define a new forced mode to route media to remote submix.
Update media routing rules according to mode.
Modify device connection management for remote submix.

Note that this CL doesn't implement changes to not prevent audio
 recording when WFD is on, as audio recording is currently limited
 to one input.

Change-Id: I458fe1802705da2d091ff82e536dc3e7f092f291

3 files changed, 35 insertions, 6 deletions

diff --git a/audio/AudioPolicyManagerBase.cpp b/audio/AudioPolicyManagerBase.cpp
index 7cd5652..9d4d6b9 100644
--- a/audio/AudioPolicyManagerBase.cpp
+++ b/audio/AudioPolicyManagerBase.cpp
@@ -62,11 +62,15 @@ status_t AudioPolicyManagerBase::setDeviceConnectionState(audio_devices_t device
     if (audio_is_output_device(device)) {
 
         if (!mHasA2dp && audio_is_a2dp_device(device)) {
-            ALOGE("setDeviceConnectionState() invalid device: %x", device);
+            ALOGE("setDeviceConnectionState() invalid A2DP device: %x", device);
             return BAD_VALUE;
         }
         if (!mHasUsb && audio_is_usb_device(device)) {
-            ALOGE("setDeviceConnectionState() invalid device: %x", device);
+            ALOGE("setDeviceConnectionState() invalid USB audio device: %x", device);
+            return BAD_VALUE;
+        }
+        if (!mHasRemoteSubmix && audio_is_remote_submix_device((audio_devices_t)device)) {
+            ALOGE("setDeviceConnectionState() invalid remote submix audio device: %x", device);
             return BAD_VALUE;
         }
 
@@ -108,6 +112,8 @@ status_t AudioPolicyManagerBase::setDeviceConnectionState(audio_devices_t device
                     mUsbCardAndDevice = String8(device_address, MAX_DEVICE_ADDRESS_LEN);
                     paramStr = mUsbCardAndDevice;
                 }
+                // not currently handling multiple simultaneous submixes: ignoring remote submix
+                //   case and address
                 if (!paramStr.isEmpty()) {
                     for (size_t i = 0; i < outputs.size(); i++) {
                         mpClientInterface->setParameters(outputs[i], paramStr);
@@ -138,6 +144,8 @@ status_t AudioPolicyManagerBase::setDeviceConnectionState(audio_devices_t device
                 // handle USB device disconnection
                 mUsbCardAndDevice = "";
             }
+            // not currently handling multiple simultaneous submixes: ignoring remote submix
+            //   case and address
             } break;
 
         default:
@@ -241,7 +249,10 @@ AudioSystem::device_connection_state AudioPolicyManagerBase::getDeviceConnection
             }
             if (audio_is_usb_device(device) &&
                 (!mHasUsb || (address != "" && mUsbCardAndDevice != address))) {
-                ALOGE("setDeviceConnectionState() invalid device: %x", device);
+                ALOGE("getDeviceConnectionState() invalid device: %x", device);
+                return state;
+            }
+            if (audio_is_remote_submix_device((audio_devices_t)device) && !mHasRemoteSubmix) {
                 return state;
             }
             state = AudioSystem::DEVICE_STATE_AVAILABLE;
@@ -373,7 +384,8 @@ void AudioPolicyManagerBase::setForceUse(AudioSystem::force_use usage, AudioSyst
             config != AudioSystem::FORCE_WIRED_ACCESSORY &&
             config != AudioSystem::FORCE_ANALOG_DOCK &&
             config != AudioSystem::FORCE_DIGITAL_DOCK && config != AudioSystem::FORCE_NONE &&
-            config != AudioSystem::FORCE_NO_BT_A2DP) {
+            config != AudioSystem::FORCE_NO_BT_A2DP &&
+            config != AudioSystem::FORCE_REMOTE_SUBMIX) {
             ALOGW("setForceUse() invalid config %d for FOR_MEDIA", config);
             return;
         }
@@ -1244,7 +1256,7 @@ AudioPolicyManagerBase::AudioPolicyManagerBase(AudioPolicyClientInterface *clien
     mPhoneState(AudioSystem::MODE_NORMAL),
     mLimitRingtoneVolume(false), mLastVoiceVolume(-1.0f),
     mTotalEffectsCpuLoad(0), mTotalEffectsMemory(0),
-    mA2dpSuspended(false), mHasA2dp(false), mHasUsb(false)
+    mA2dpSuspended(false), mHasA2dp(false), mHasUsb(false), mHasRemoteSubmix(false)
 {
     mpClientInterface = clientInterface;
 
@@ -2157,7 +2169,12 @@ audio_devices_t AudioPolicyManagerBase::getDeviceForStrategy(routing_strategy st
 
     case STRATEGY_MEDIA: {
         uint32_t device2 = APM_AUDIO_DEVICE_NONE;
-        if (mHasA2dp && (mForceUse[AudioSystem::FOR_MEDIA] != AudioSystem::FORCE_NO_BT_A2DP) &&
+        if (mHasRemoteSubmix
+                && mForceUse[AudioSystem::FOR_MEDIA] == AudioSystem::FORCE_REMOTE_SUBMIX) {
+            device2 = mAvailableOutputDevices & AUDIO_DEVICE_OUT_REMOTE_SUBMIX;
+        }
+        if ((device2 == APM_AUDIO_DEVICE_NONE) &&
+                mHasA2dp && (mForceUse[AudioSystem::FOR_MEDIA] != AudioSystem::FORCE_NO_BT_A2DP) &&
                 (getA2dpOutput() != APM_AUDIO_DEVICE_NONE) && !mA2dpSuspended) {
             device2 = mAvailableOutputDevices & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP;
             if (device2 == APM_AUDIO_DEVICE_NONE) {
@@ -2395,6 +2412,11 @@ audio_devices_t AudioPolicyManagerBase::getDeviceForInputSource(int inputSource)
             device = AUDIO_DEVICE_IN_VOICE_CALL;
         }
         break;
+    case AUDIO_SOURCE_REMOTE_SUBMIX:
+        if (mAvailableInputDevices & AUDIO_DEVICE_IN_REMOTE_SUBMIX) {
+            device = AUDIO_DEVICE_IN_REMOTE_SUBMIX;
+        }
+        break;
     default:
         ALOGW("getDeviceForInputSource() invalid input source %d", inputSource);
         break;
@@ -2458,6 +2480,7 @@ AudioPolicyManagerBase::device_category AudioPolicyManagerBase::getDeviceCategor
         case AUDIO_DEVICE_OUT_AUX_DIGITAL:
         case AUDIO_DEVICE_OUT_USB_ACCESSORY:
         case AUDIO_DEVICE_OUT_USB_DEVICE:
+        case AUDIO_DEVICE_OUT_REMOTE_SUBMIX:
         default:
             return DEVICE_CATEGORY_SPEAKER;
     }
@@ -3268,12 +3291,14 @@ const struct StringToEnum sDeviceNameToEnumTable[] = {
     STRING_TO_ENUM(AUDIO_DEVICE_OUT_USB_DEVICE),
     STRING_TO_ENUM(AUDIO_DEVICE_OUT_USB_ACCESSORY),
     STRING_TO_ENUM(AUDIO_DEVICE_OUT_ALL_USB),
+    STRING_TO_ENUM(AUDIO_DEVICE_OUT_REMOTE_SUBMIX),
     STRING_TO_ENUM(AUDIO_DEVICE_IN_BUILTIN_MIC),
     STRING_TO_ENUM(AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET),
     STRING_TO_ENUM(AUDIO_DEVICE_IN_WIRED_HEADSET),
     STRING_TO_ENUM(AUDIO_DEVICE_IN_AUX_DIGITAL),
     STRING_TO_ENUM(AUDIO_DEVICE_IN_VOICE_CALL),
     STRING_TO_ENUM(AUDIO_DEVICE_IN_BACK_MIC),
+    STRING_TO_ENUM(AUDIO_DEVICE_IN_REMOTE_SUBMIX),
 };
 
 const struct StringToEnum sFlagNameToEnumTable[] = {
@@ -3544,6 +3569,8 @@ void AudioPolicyManagerBase::loadHwModule(cnode *root)
             mHasA2dp = true;
         } else if (strcmp(root->name, AUDIO_HARDWARE_MODULE_ID_USB) == 0) {
             mHasUsb = true;
+        } else if (strcmp(root->name, AUDIO_HARDWARE_MODULE_ID_REMOTE_SUBMIX) == 0) {
+            mHasRemoteSubmix = true;
         }
 
         node = node->first_child;
diff --git a/include/hardware_legacy/AudioPolicyManagerBase.h b/include/hardware_legacy/AudioPolicyManagerBase.h
index 5030e40..a6ae397 100644
--- a/include/hardware_legacy/AudioPolicyManagerBase.h
+++ b/include/hardware_legacy/AudioPolicyManagerBase.h
@@ -529,6 +529,7 @@ protected:
         bool    mA2dpSuspended;  // true if A2DP output is suspended
         bool mHasA2dp; // true on platforms with support for bluetooth A2DP
         bool mHasUsb; // true on platforms with support for USB audio
+        bool mHasRemoteSubmix; // true on platforms with support for remote presentation of a submix
         audio_devices_t mAttachedOutputDevices; // output devices always available on the platform
         audio_devices_t mDefaultOutputDevice; // output device selected by default at boot time
                                               // (must be in mAttachedOutputDevices)
diff --git a/include/hardware_legacy/AudioSystemLegacy.h b/include/hardware_legacy/AudioSystemLegacy.h
index 93e0462..8eec57b 100644
--- a/include/hardware_legacy/AudioSystemLegacy.h
+++ b/include/hardware_legacy/AudioSystemLegacy.h
@@ -288,6 +288,7 @@ public:
         FORCE_ANALOG_DOCK,
         FORCE_DIGITAL_DOCK,
         FORCE_NO_BT_A2DP,
+        FORCE_REMOTE_SUBMIX,
         NUM_FORCE_CONFIG,
         FORCE_DEFAULT = FORCE_NONE
     };