commit c8c4f1f6d91a87970b9e37312756af78b9dd1417
author Eric Laurent <elaurent@google.com> Tue Nov 09 11:51:34 2021 +0100
committer Eric Laurent <elaurent@google.com> Tue Nov 09 19:05:47 2021 +0100
tree 30d391bf3c6c5e27f73ff9e72ef3ecbf48c477b5
parent 79ede93e3f0f00d1743c85ab6c11c9f1f89bf1d4

audio policy: add call redirection audio modes

Add two audio modes corresponding to a call redirection
scenario:
- AUDIO_MODE_CALL_REDIRECT: PSTN call redirection
- AUDIO_MODE_COMMUNICATION_REDIRECT: VoIP call redirection

When in call redirect mode, call audio uplink and downlink are not
routed to regular audio sinks (e.g. earpiece) or sources (e.g. built in
mic) but disconnected. A privileged app can use system APIs to inject
and extract call audio and redirect the call to another device.

All other media use cases operate as if no call was active.

Those modes are system only and not used by the audio HAL: the HAL
behavior when mode is AUDIO_MODE_CALL_REDIRECT is the same as for
AUDIO_MODE_CALL_SCREEN and when mode is AUDIO_MODE_COMMUNICATION_REDIRECT
is the same as AUDIO_MODE_NORMAL.

Bug: 189472651
Test: make
Change-Id: Ief82b74796e8d6452c3b669aa5a2ecd558c9b48e

services/audiopolicy/managerdefault/AudioPolicyManager.cpp

diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 6221c05..a3f2e59 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -6134,11 +6134,11 @@
     uid_t uid;
     sp<RecordClientDescriptor> topClient = inputDesc->getHighestPriorityClient();
     if (topClient != nullptr) {
-      attributes = topClient->attributes();
-      uid = topClient->uid();
+        attributes = topClient->attributes();
+        uid = topClient->uid();
     } else {
-      attributes = { .source = AUDIO_SOURCE_DEFAULT };
-      uid = 0;
+        attributes = { .source = AUDIO_SOURCE_DEFAULT };
+        uid = 0;
     }
 
     if (attributes.source == AUDIO_SOURCE_DEFAULT && isInCall()) {
@@ -6938,8 +6938,8 @@
 {
     audio_mode_t mode = mEngine->getPhoneState();
     return (mode == AUDIO_MODE_IN_CALL)
-            || (mode == AUDIO_MODE_IN_COMMUNICATION)
-            || (mode == AUDIO_MODE_CALL_SCREEN);
+            || (mode == AUDIO_MODE_CALL_SCREEN)
+            || (mode == AUDIO_MODE_CALL_REDIRECT);
 }
 
 void AudioPolicyManager::cleanUpForDevice(const sp<DeviceDescriptor>& deviceDesc)