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, 6 insertions, 1 deletions

diff --git a/services/audiopolicy/service/AudioPolicyEffects.cpp b/services/audiopolicy/service/AudioPolicyEffects.cpp
index 26857b1..d72e255 100644
--- a/services/audiopolicy/service/AudioPolicyEffects.cpp
+++ b/services/audiopolicy/service/AudioPolicyEffects.cpp
@@ -28,6 +28,7 @@
 #include <utils/Vector.h>
 #include <utils/SortedVector.h>
 #include <cutils/config_utils.h>
+#include "AudioPolicyService.h"
 #include "AudioPolicyEffects.h"
 #include "ServiceUtilities.h"
 
@@ -37,7 +38,8 @@ namespace android {
 // AudioPolicyEffects Implementation
 // ----------------------------------------------------------------------------
 
-AudioPolicyEffects::AudioPolicyEffects()
+AudioPolicyEffects::AudioPolicyEffects(AudioPolicyService *audioPolicyService) :
+    mAudioPolicyService(audioPolicyService)
 {
     // load automatic audio effect modules
     if (access(AUDIO_EFFECT_VENDOR_CONFIG_FILE2, R_OK) == 0) {
@@ -244,6 +246,8 @@ status_t AudioPolicyEffects::addOutputSessionEffects(audio_io_handle_t output,
     if (idx < 0) {
         procDesc = new EffectVector(audioSession);
         mOutputSessions.add(audioSession, procDesc);
+
+        mAudioPolicyService->onOutputSessionEffectsUpdate(stream, audioSession, true);
     } else {
         // EffectVector is existing and we just need to increase ref count
         procDesc = mOutputSessions.valueAt(idx);
@@ -299,6 +303,7 @@ status_t AudioPolicyEffects::releaseOutputSessionEffects(audio_io_handle_t outpu
         procDesc->mEffects.clear();
         delete procDesc;
         mOutputSessions.removeItemsAt(index);
+        mAudioPolicyService->onOutputSessionEffectsUpdate(stream, audioSession, false);
         ALOGV("releaseOutputSessionEffects(): output processing released from session: %d",
               audioSession);
     }