Add sound trigger control by audio policy

Audio policy:
- Added active capture indication to sound trigger service:
recognition stops if concurrent capture is not supported.
- Added generation of reserved I/O handle and session ID for
utterance capture.

Sound trigger service
- Added sound model update callback handling.
- Added service state callback
- Simplified callback shared memory allocation.

Bug: 12378680.

Change-Id: Ib0292c2733e6df90fdae480633dd9953d0016ef1

2 files changed, 81 insertions, 1 deletions

diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index 365a594..172b056 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -913,6 +913,21 @@ void AudioSystem::setAudioPortCallback(sp<AudioPortCallback> callBack)
     gAudioPortCallback = callBack;
 }
 
+status_t AudioSystem::acquireSoundTriggerSession(audio_session_t *session,
+                                       audio_io_handle_t *ioHandle,
+                                       audio_devices_t *device)
+{
+    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
+    if (aps == 0) return PERMISSION_DENIED;
+    return aps->acquireSoundTriggerSession(session, ioHandle, device);
+}
+
+status_t AudioSystem::releaseSoundTriggerSession(audio_session_t session)
+{
+    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
+    if (aps == 0) return PERMISSION_DENIED;
+    return aps->releaseSoundTriggerSession(session);
+}
 // ---------------------------------------------------------------------------
 
 void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who __unused)
diff --git a/media/libmedia/IAudioPolicyService.cpp b/media/libmedia/IAudioPolicyService.cpp
index 1593b17..b57f747 100644
--- a/media/libmedia/IAudioPolicyService.cpp
+++ b/media/libmedia/IAudioPolicyService.cpp
@@ -65,7 +65,9 @@ enum {
     LIST_AUDIO_PATCHES,
     SET_AUDIO_PORT_CONFIG,
     REGISTER_CLIENT,
-    GET_OUTPUT_FOR_ATTR
+    GET_OUTPUT_FOR_ATTR,
+    ACQUIRE_SOUNDTRIGGER_SESSION,
+    RELEASE_SOUNDTRIGGER_SESSION
 };
 
 class BpAudioPolicyService : public BpInterface<IAudioPolicyService>
@@ -563,6 +565,7 @@ public:
         }
         return status;
     }
+
     virtual void registerClient(const sp<IAudioPolicyServiceClient>& client)
     {
         Parcel data, reply;
@@ -570,6 +573,40 @@ public:
         data.writeStrongBinder(client->asBinder());
         remote()->transact(REGISTER_CLIENT, data, &reply);
     }
+
+    virtual status_t acquireSoundTriggerSession(audio_session_t *session,
+                                            audio_io_handle_t *ioHandle,
+                                            audio_devices_t *device)
+    {
+        if (session == NULL || ioHandle == NULL || device == NULL) {
+            return BAD_VALUE;
+        }
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());
+        status_t status = remote()->transact(ACQUIRE_SOUNDTRIGGER_SESSION, data, &reply);
+        if (status != NO_ERROR) {
+            return status;
+        }
+        status = (status_t)reply.readInt32();
+        if (status == NO_ERROR) {
+            *session = (audio_session_t)reply.readInt32();
+            *ioHandle = (audio_io_handle_t)reply.readInt32();
+            *device = (audio_devices_t)reply.readInt32();
+        }
+        return status;
+    }
+
+    virtual status_t releaseSoundTriggerSession(audio_session_t session)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());
+        data.writeInt32(session);
+        status_t status = remote()->transact(RELEASE_SOUNDTRIGGER_SESSION, data, &reply);
+        if (status != NO_ERROR) {
+            return status;
+        }
+        return (status_t)reply.readInt32();
+    }
 };
 
 IMPLEMENT_META_INTERFACE(AudioPolicyService, "android.media.IAudioPolicyService");
@@ -984,6 +1021,7 @@ status_t BnAudioPolicyService::onTransact(
             reply->writeInt32(status);
             return NO_ERROR;
         }
+
         case REGISTER_CLIENT: {
             CHECK_INTERFACE(IAudioPolicyService, data, reply);
             sp<IAudioPolicyServiceClient> client = interface_cast<IAudioPolicyServiceClient>(
@@ -992,6 +1030,33 @@ status_t BnAudioPolicyService::onTransact(
             return NO_ERROR;
         } break;
 
+        case ACQUIRE_SOUNDTRIGGER_SESSION: {
+            CHECK_INTERFACE(IAudioPolicyService, data, reply);
+            sp<IAudioPolicyServiceClient> client = interface_cast<IAudioPolicyServiceClient>(
+                    data.readStrongBinder());
+            audio_session_t session;
+            audio_io_handle_t ioHandle;
+            audio_devices_t device;
+            status_t status = acquireSoundTriggerSession(&session, &ioHandle, &device);
+            reply->writeInt32(status);
+            if (status == NO_ERROR) {
+                reply->writeInt32(session);
+                reply->writeInt32(ioHandle);
+                reply->writeInt32(device);
+            }
+            return NO_ERROR;
+        } break;
+
+        case RELEASE_SOUNDTRIGGER_SESSION: {
+            CHECK_INTERFACE(IAudioPolicyService, data, reply);
+            sp<IAudioPolicyServiceClient> client = interface_cast<IAudioPolicyServiceClient>(
+                    data.readStrongBinder());
+            audio_session_t session = (audio_session_t)data.readInt32();
+            status_t status = releaseSoundTriggerSession(session);
+            reply->writeInt32(status);
+            return NO_ERROR;
+        } break;
+
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }