AudioPolicyService InputDesc minor cleanup

Add a non-default constructor to set the mSessionId, and make mSessionId const.

Remove explicit clear on mEffects - it is automatically cleared by the destructor.

AudioPolicyService::setPreProcessorEnabled:
 - parameter is const *
 - use an alias instead of making a Vector copy

Destructor doesn't need to be virtual since there are no subclasses.

Change-Id: Ibc3c3bea8259839430b1cf5356186c7d96f1082f

Author: gkasten

services/audioflinger/AudioPolicyService.cpp

@@ -298,8 +298,7 @@ audio_io_handle_t AudioPolicyService::getInput(audio_source_t inputSource,
     ssize_t idx = mInputs.indexOfKey(input);
     InputDesc *inputDesc;
     if (idx < 0) {
-        inputDesc = new InputDesc();
-        inputDesc->mSessionId = audioSession;
+        inputDesc = new InputDesc(audioSession);
         mInputs.add(input, inputDesc);
     } else {
         inputDesc = mInputs.valueAt(idx);
@@ -358,7 +357,6 @@ void AudioPolicyService::releaseInput(audio_io_handle_t input)
     }
     InputDesc *inputDesc = mInputs.valueAt(index);
     setPreProcessorEnabled(inputDesc, false);
-    inputDesc->mEffects.clear();
     delete inputDesc;
     mInputs.removeItemsAt(index);
 }
@@ -600,9 +598,9 @@ status_t AudioPolicyService::dumpPermissionDenial(int fd)
     return NO_ERROR;
 }
 
-void AudioPolicyService::setPreProcessorEnabled(InputDesc *inputDesc, bool enabled)
+void AudioPolicyService::setPreProcessorEnabled(const InputDesc *inputDesc, bool enabled)
 {
-    Vector<sp<AudioEffect> > fxVector = inputDesc->mEffects;
+    const Vector<sp<AudioEffect> > &fxVector = inputDesc->mEffects;
     for (size_t i = 0; i < fxVector.size(); i++) {
         fxVector.itemAt(i)->setEnabled(enabled);
     }

services/audioflinger/AudioPolicyService.h

@@ -279,15 +279,15 @@ class AudioPolicyService :
 
     class InputDesc {
     public:
-        InputDesc() {}
-        virtual ~InputDesc() {}
-        int mSessionId;
+        InputDesc(int session) : mSessionId(session) {}
+        /*virtual*/ ~InputDesc() {}
+        const int mSessionId;
         Vector< sp<AudioEffect> >mEffects;
     };
 
     static const char * const kInputSourceNames[AUDIO_SOURCE_CNT -1];
 
-    void setPreProcessorEnabled(InputDesc *inputDesc, bool enabled);
+    void setPreProcessorEnabled(const InputDesc *inputDesc, bool enabled);
     status_t loadPreProcessorConfig(const char *path);
     status_t loadEffects(cnode *root, Vector <EffectDesc *>& effects);
     EffectDesc *loadEffect(cnode *root);