audio policy: fix USB mic selection for VoIP

When transitioning from speaker phone to normal mode and a USB
headset is connected, we must force a teardown of active input
as the new input device cannot be reached via current input stream.

Bug: 24406915.
Change-Id: I9f7c1d3f3cba285c25a6da1d54a3d15a5c1f378a

1 files changed, 8 insertions, 2 deletions

diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 8419ed5..aa4486d 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -566,9 +566,15 @@ void AudioPolicyManager::setForceUse(audio_policy_force_use_t usage,
 
     audio_io_handle_t activeInput = mInputs.getActiveInput();
     if (activeInput != 0) {
-        setInputDevice(activeInput, getNewInputDevice(activeInput));
+        sp<AudioInputDescriptor> activeDesc = mInputs.valueFor(activeInput);
+        audio_devices_t newDevice = getNewInputDevice(activeInput);
+        // Force new input selection if the new device can not be reached via current input
+        if (activeDesc->mProfile->mSupportedDevices.types() & (newDevice & ~AUDIO_DEVICE_BIT_IN)) {
+            setInputDevice(activeInput, newDevice);
+        } else {
+            closeInput(activeInput);
+        }
     }
-
 }
 
 void AudioPolicyManager::setSystemProperty(const char* property, const char* value)