audiopolicy: Add notification when default effects are updated

 * In M, we now have the ability to define a default set of audio effect
   on a per-stream basis. This allows us to get around the problem of
   apps not sending the control intents so we can implement smart
   global effects for specific media types.
 * We still need a session id in order to get a handle and configure them
   from an app like AudioFX, so we'll need to add some plumbing in
   order to send an event to interested applications.
 * This patch implements the native side of this. The Java layer will
   call down thru AudioSystem and register a callback which will be
   invoked by the audio policy when default effects are updated on
   a stream. This callback will receive both the stream type as well
   as the session id.
 * Attaching this listener requires that the caller hold the
   MODIFY_AUDIO_ROUTING permission.

Change-Id: I142b15f2585ffca6a953c3e828e2a7c07b24f56c

1 files changed, 80 insertions, 2 deletions

diff --git a/services/audiopolicy/service/AudioPolicyService.cpp b/services/audiopolicy/service/AudioPolicyService.cpp
index 12cca65..dbeed80 100644
--- a/services/audiopolicy/service/AudioPolicyService.cpp
+++ b/services/audiopolicy/service/AudioPolicyService.cpp
@@ -116,7 +116,7 @@ void AudioPolicyService::onFirstRef()
 #endif
     }
     // load audio processing modules
-    sp<AudioPolicyEffects>audioPolicyEffects = new AudioPolicyEffects();
+    sp<AudioPolicyEffects>audioPolicyEffects = new AudioPolicyEffects(this);
     {
         Mutex::Autolock _l(mLock);
         mAudioPolicyEffects = audioPolicyEffects;
@@ -177,6 +177,23 @@ void AudioPolicyService::setAudioPortCallbacksEnabled(bool enabled)
     mNotificationClients.valueFor(uid)->setAudioPortCallbacksEnabled(enabled);
 }
 
+status_t AudioPolicyService::setEffectSessionCallbacksEnabled(bool enabled)
+{
+    Mutex::Autolock _l(mNotificationClientsLock);
+
+    uid_t uid = IPCThreadState::self()->getCallingUid();
+    if (mNotificationClients.indexOfKey(uid) < 0) {
+        return NO_INIT;
+    }
+    if (!modifyAudioRoutingAllowed()) {
+        ALOGE("setEffectSessionCallbacksEnabled requires MODIFY_AUDIO_ROUTING");
+        return PERMISSION_DENIED;
+    }
+    mNotificationClients.valueFor(uid)->setEffectSessionCallbacksEnabled(enabled);
+    return OK;
+}
+
+
 // removeNotificationClient() is called when the client process dies.
 void AudioPolicyService::removeNotificationClient(uid_t uid)
 {
@@ -254,11 +271,31 @@ status_t AudioPolicyService::clientSetAudioPortConfig(const struct audio_port_co
     return mAudioCommandThread->setAudioPortConfigCommand(config, delayMs);
 }
 
+void AudioPolicyService::onOutputSessionEffectsUpdate(audio_stream_type_t stream,
+                                                      audio_unique_id_t sessionId,
+                                                      bool added)
+{
+    ALOGV("AudioPolicyService::onOutputSessionEffectsUpdate(%d, %d, %d)",
+            stream, sessionId, added);
+    mOutputCommandThread->effectSessionUpdateCommand(stream, sessionId, added);
+}
+
+void AudioPolicyService::doOnOutputSessionEffectsUpdate(audio_stream_type_t stream,
+                                                        audio_unique_id_t sessionId,
+                                                        bool added)
+{
+    Mutex::Autolock _l(mNotificationClientsLock);
+    for (size_t i = 0; i < mNotificationClients.size(); i++) {
+        mNotificationClients.valueAt(i)->onOutputSessionEffectsUpdate(stream, sessionId, added);
+    }
+}
+
 AudioPolicyService::NotificationClient::NotificationClient(const sp<AudioPolicyService>& service,
                                                      const sp<IAudioPolicyServiceClient>& client,
                                                      uid_t uid)
     : mService(service), mUid(uid), mAudioPolicyServiceClient(client),
-      mAudioPortCallbacksEnabled(false)
+      mAudioPortCallbacksEnabled(false),
+      mEffectSessionCallbacksEnabled(false)
 {
 }
 
@@ -289,6 +326,14 @@ void AudioPolicyService::NotificationClient::onAudioPatchListUpdate()
     }
 }
 
+void AudioPolicyService::NotificationClient::onOutputSessionEffectsUpdate(
+        audio_stream_type_t stream, audio_unique_id_t sessionId, bool added)
+{
+    if (mAudioPolicyServiceClient != 0 && mEffectSessionCallbacksEnabled) {
+        mAudioPolicyServiceClient->onOutputSessionEffectsUpdate(stream, sessionId, added);
+    }
+}
+
 void AudioPolicyService::NotificationClient::onDynamicPolicyMixStateUpdate(
         String8 regId, int32_t state)
 {
@@ -302,6 +347,10 @@ void AudioPolicyService::NotificationClient::setAudioPortCallbacksEnabled(bool e
     mAudioPortCallbacksEnabled = enabled;
 }
 
+void AudioPolicyService::NotificationClient::setEffectSessionCallbacksEnabled(bool enabled)
+{
+    mEffectSessionCallbacksEnabled = enabled;
+}
 
 void AudioPolicyService::binderDied(const wp<IBinder>& who) {
     ALOGW("binderDied() %p, calling pid %d", who.unsafe_get(),
@@ -579,6 +628,20 @@ bool AudioPolicyService::AudioCommandThread::threadLoop()
                     svc->doOnDynamicPolicyMixStateUpdate(data->mRegId, data->mState);
                     mLock.lock();
                     } break;
+                case EFFECT_SESSION_UPDATE: {
+                    EffectSessionUpdateData *data =
+                            (EffectSessionUpdateData *)command->mParam.get();
+                    ALOGV("AudioCommandThread() processing effect session update %d %d %d",
+                            data->mStream, data->mSessionId, data->mAdded);
+                    svc = mService.promote();
+                    if (svc == 0) {
+                        break;
+                    }
+                    mLock.unlock();
+                    svc->doOnOutputSessionEffectsUpdate(data->mStream, data->mSessionId, data->mAdded);
+                    mLock.lock();
+                    } break;
+
                 default:
                     ALOGW("AudioCommandThread() unknown command %d", command->mCommand);
                 }
@@ -851,6 +914,21 @@ void AudioPolicyService::AudioCommandThread::dynamicPolicyMixStateUpdateCommand(
     sendCommand(command);
 }
 
+void AudioPolicyService::AudioCommandThread::effectSessionUpdateCommand(
+        audio_stream_type_t stream, audio_unique_id_t sessionId, bool added)
+{
+    sp<AudioCommand> command = new AudioCommand();
+    command->mCommand = EFFECT_SESSION_UPDATE;
+    EffectSessionUpdateData *data = new EffectSessionUpdateData();
+    data->mStream = stream;
+    data->mSessionId = sessionId;
+    data->mAdded = added;
+    command->mParam = data;
+    ALOGV("AudioCommandThread() sending effect session update (id=%d) for stream %d (added=%d)",
+            stream, sessionId, added);
+    sendCommand(command);
+}
+
 status_t AudioPolicyService::AudioCommandThread::sendCommand(sp<AudioCommand>& command, int delayMs)
 {
     {