Refactor AudioIoDescriptor

The following changes were made:

 1. Make the class mostly immutable (except for the 'mPatch' field).
 2. Provide constructors for specific use cases.
 3. Add 'isInput' field instead of deducing it by patch data.
 4. Provide conversion to string for logging.
 5. Rename 'audio_io_config_event' to 'audio_io_config_event_t'
    to conform to other enum type names.

Bug: 188932434
Test: m
Change-Id: I35e5c83bcb917f60d01ee977eef9b869c3894074
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index 3001863..38e55a3 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -113,7 +113,7 @@
 
     class IoConfigEventData : public ConfigEventData {
     public:
-        IoConfigEventData(audio_io_config_event event, pid_t pid,
+        IoConfigEventData(audio_io_config_event_t event, pid_t pid,
                           audio_port_handle_t portId) :
             mEvent(event), mPid(pid), mPortId(portId) {}
 
@@ -121,14 +121,14 @@
             snprintf(buffer, size, "- IO event: event %d\n", mEvent);
         }
 
-        const audio_io_config_event mEvent;
+        const audio_io_config_event_t mEvent;
         const pid_t                 mPid;
         const audio_port_handle_t   mPortId;
     };
 
     class IoConfigEvent : public ConfigEvent {
     public:
-        IoConfigEvent(audio_io_config_event event, pid_t pid, audio_port_handle_t portId) :
+        IoConfigEvent(audio_io_config_event_t event, pid_t pid, audio_port_handle_t portId) :
             ConfigEvent(CFG_EVENT_IO) {
             mData = new IoConfigEventData(event, pid, portId);
         }
@@ -332,15 +332,15 @@
                                                     status_t& status) = 0;
     virtual     status_t    setParameters(const String8& keyValuePairs);
     virtual     String8     getParameters(const String8& keys) = 0;
-    virtual     void        ioConfigChanged(audio_io_config_event event, pid_t pid = 0,
+    virtual     void        ioConfigChanged(audio_io_config_event_t event, pid_t pid = 0,
                                         audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE) = 0;
                 // sendConfigEvent_l() must be called with ThreadBase::mLock held
                 // Can temporarily release the lock if waiting for a reply from
                 // processConfigEvents_l().
                 status_t    sendConfigEvent_l(sp<ConfigEvent>& event);
-                void        sendIoConfigEvent(audio_io_config_event event, pid_t pid = 0,
+                void        sendIoConfigEvent(audio_io_config_event_t event, pid_t pid = 0,
                                               audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
-                void        sendIoConfigEvent_l(audio_io_config_event event, pid_t pid = 0,
+                void        sendIoConfigEvent_l(audio_io_config_event_t event, pid_t pid = 0,
                                             audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
                 void        sendPrioConfigEvent(pid_t pid, pid_t tid, int32_t prio, bool forApp);
                 void        sendPrioConfigEvent_l(pid_t pid, pid_t tid, int32_t prio, bool forApp);
@@ -972,7 +972,7 @@
                                 { return android_atomic_acquire_load(&mSuspended) > 0; }
 
     virtual     String8     getParameters(const String8& keys);
-    virtual     void        ioConfigChanged(audio_io_config_event event, pid_t pid = 0,
+    virtual     void        ioConfigChanged(audio_io_config_event_t event, pid_t pid = 0,
                                             audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
                 status_t    getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames);
                 // Consider also removing and passing an explicit mMainBuffer initialization
@@ -1785,7 +1785,7 @@
                                                status_t& status);
     virtual void        cacheParameters_l() {}
     virtual String8     getParameters(const String8& keys);
-    virtual void        ioConfigChanged(audio_io_config_event event, pid_t pid = 0,
+    virtual void        ioConfigChanged(audio_io_config_event_t event, pid_t pid = 0,
                                         audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
     virtual status_t    createAudioPatch_l(const struct audio_patch *patch,
                                            audio_patch_handle_t *handle);
@@ -1994,7 +1994,7 @@
     virtual     bool        checkForNewParameter_l(const String8& keyValuePair,
                                                     status_t& status);
     virtual     String8     getParameters(const String8& keys);
-    virtual     void        ioConfigChanged(audio_io_config_event event, pid_t pid = 0,
+    virtual     void        ioConfigChanged(audio_io_config_event_t event, pid_t pid = 0,
                                             audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
                 void        readHalParameters_l();
     virtual     void        cacheParameters_l() {}