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, 20 insertions, 1 deletions

diff --git a/services/audiopolicy/service/AudioPolicyEffects.h b/services/audiopolicy/service/AudioPolicyEffects.h
index 3845050..a95d49f 100644
--- a/services/audiopolicy/service/AudioPolicyEffects.h
+++ b/services/audiopolicy/service/AudioPolicyEffects.h
@@ -31,6 +31,8 @@
 
 namespace android {
 
+class AudioPolicyService;
+
 // ----------------------------------------------------------------------------
 
 // AudioPolicyEffects class
@@ -44,7 +46,7 @@ public:
     // The constructor will parse audio_effects.conf
     // First it will look whether vendor specific file exists,
     // otherwise it will parse the system default file.
-	         AudioPolicyEffects();
+            AudioPolicyEffects(AudioPolicyService *audioPolicyService);
     virtual ~AudioPolicyEffects();
 
     // NOTE: methods on AudioPolicyEffects should never be called with the AudioPolicyService
@@ -84,6 +86,19 @@ public:
                              audio_stream_type_t stream,
                              int audioSession);
 
+    status_t updateOutputAudioSessionInfo(audio_io_handle_t output,
+                             audio_stream_type_t stream,
+                             int audioSession,
+                             audio_output_flags_t flags,
+                             audio_channel_mask_t channelMask, uid_t uid);
+
+    status_t releaseOutputAudioSessionInfo(audio_io_handle_t output,
+                             audio_stream_type_t stream,
+                             int audioSession);
+
+    status_t listAudioSessions(audio_stream_type_t streams,
+                             Vector< sp<AudioSessionInfo>> &sessions);
+
 private:
 
     // class to store the description of an effects and its parameters
@@ -192,6 +207,10 @@ private:
     KeyedVector< audio_stream_type_t, EffectDescVector* > mOutputStreams;
     // Automatic output effects are unique for audiosession ID
     KeyedVector< int32_t, EffectVector* > mOutputSessions;
+    // Stream info for session events
+    KeyedVector< int32_t, sp<AudioSessionInfo> > mOutputAudioSessionInfo;
+
+    AudioPolicyService *mAudioPolicyService;
 };
 
 }; // namespace android