audiopolicy: Add AudioSessionInfo API

 * This patch introduces a new API which allows applications to
   query the state of the audio effects system, and receive
   callbacks with the necessary information to attach effects
   to any stream.
 * In the future, this may come as part of the AudioPort system,
   but since that's an active area of development by Google, we
   will dodge it for now.
 * The policy now simply keeps a refcounted list of objects which
   hold various bits of stream metadata. Callbacks are sent on
   stream open/close to applications which might be listening
   for them.

Change-Id: I2d554d36e1378f4eb7b276010a3bfe8345c22ecd

1 files changed, 53 insertions, 1 deletions

diff --git a/services/audiopolicy/service/AudioPolicyService.cpp b/services/audiopolicy/service/AudioPolicyService.cpp
index 12cca65..79370f4 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;
@@ -254,6 +254,21 @@ status_t AudioPolicyService::clientSetAudioPortConfig(const struct audio_port_co
     return mAudioCommandThread->setAudioPortConfigCommand(config, delayMs);
 }
 
+void AudioPolicyService::onOutputSessionEffectsUpdate(sp<AudioSessionInfo>& info, bool added)
+{
+    ALOGV("AudioPolicyService::onOutputSessionEffectsUpdate(%d, %d, %d)",
+            info->mStream, info->mSessionId, added);
+    mOutputCommandThread->effectSessionUpdateCommand(info, added);
+}
+
+void AudioPolicyService::doOnOutputSessionEffectsUpdate(sp<AudioSessionInfo>& info, bool added)
+{
+    Mutex::Autolock _l(mNotificationClientsLock);
+    for (size_t i = 0; i < mNotificationClients.size(); i++) {
+        mNotificationClients.valueAt(i)->onOutputSessionEffectsUpdate(info, added);
+    }
+}
+
 AudioPolicyService::NotificationClient::NotificationClient(const sp<AudioPolicyService>& service,
                                                      const sp<IAudioPolicyServiceClient>& client,
                                                      uid_t uid)
@@ -289,6 +304,14 @@ void AudioPolicyService::NotificationClient::onAudioPatchListUpdate()
     }
 }
 
+void AudioPolicyService::NotificationClient::onOutputSessionEffectsUpdate(
+        sp<AudioSessionInfo>& info, bool added)
+{
+    if (mAudioPolicyServiceClient != 0) {
+        mAudioPolicyServiceClient->onOutputSessionEffectsUpdate(info, added);
+    }
+}
+
 void AudioPolicyService::NotificationClient::onDynamicPolicyMixStateUpdate(
         String8 regId, int32_t state)
 {
@@ -579,6 +602,21 @@ 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->mAudioSessionInfo->mStream, data->mAudioSessionInfo->mSessionId,
+                            data->mAdded);
+                    svc = mService.promote();
+                    if (svc == 0) {
+                        break;
+                    }
+                    mLock.unlock();
+                    svc->doOnOutputSessionEffectsUpdate(data->mAudioSessionInfo, data->mAdded);
+                    mLock.lock();
+                    } break;
+
                 default:
                     ALOGW("AudioCommandThread() unknown command %d", command->mCommand);
                 }
@@ -851,6 +889,20 @@ void AudioPolicyService::AudioCommandThread::dynamicPolicyMixStateUpdateCommand(
     sendCommand(command);
 }
 
+void AudioPolicyService::AudioCommandThread::effectSessionUpdateCommand(
+        sp<AudioSessionInfo>& streamInfo, bool added)
+{
+    sp<AudioCommand> command = new AudioCommand();
+    command->mCommand = EFFECT_SESSION_UPDATE;
+    EffectSessionUpdateData *data = new EffectSessionUpdateData();
+    data->mAudioSessionInfo = streamInfo;
+    data->mAdded = added;
+    command->mParam = data;
+    ALOGV("AudioCommandThread() sending effect session update (id=%d) for stream %d (added=%d)",
+            streamInfo->mStream, streamInfo->mSessionId, added);
+    sendCommand(command);
+}
+
 status_t AudioPolicyService::AudioCommandThread::sendCommand(sp<AudioCommand>& command, int delayMs)
 {
     {