Added getter for session Id to AudioSink

Added a method to expose the audio session id at AudioSink interface
so that the AudioPlayer in stagefright can retrieve it.

Also:
- Fixed audio effect send level not being initialized in mediaplayer.
- Fixed compilation error when LOGV is enabled in mediaplayer JNI

Change-Id: I4bb55454fd63d646e0e677692d737c4843fb05fb

include/media/MediaPlayerInterface.h

@@ -76,6 +76,7 @@ public:
         virtual uint32_t    latency() const = 0;
         virtual float       msecsPerFrame() const = 0;
         virtual status_t    getPosition(uint32_t *position) = 0;
+        virtual int         getSessionId() = 0;
 
         // If no callback is specified, use the "write" API below to submit
         // audio data.

media/jni/android_media_MediaPlayer.cpp

@@ -727,7 +727,7 @@ android_media_MediaPlayer_setAuxEffectSendLevel(JNIEnv *env, jobject thiz, jfloa
 }
 
 static void android_media_MediaPlayer_attachAuxEffect(JNIEnv *env,  jobject thiz, jint effectId) {
-    LOGV("attachAuxEffect(): %d", sessionId);
+    LOGV("attachAuxEffect(): %d", effectId);
     sp<MediaPlayer> mp = getMediaPlayer(env, thiz);
     if (mp == NULL ) {
         jniThrowException(env, "java/lang/IllegalStateException", NULL);

media/libmedia/mediaplayer.cpp

@@ -56,6 +56,7 @@ MediaPlayer::MediaPlayer()
     mVideoWidth = mVideoHeight = 0;
     mLockThreadId = 0;
     mAudioSessionId = AudioSystem::newAudioSessionId();
+    mSendLevel = 0;
 }
 
 MediaPlayer::~MediaPlayer()

media/libmediaplayerservice/MediaPlayerService.cpp

@@ -1546,6 +1546,11 @@ void MediaPlayerService::AudioOutput::CallbackWrapper(
 
 }
 
+int MediaPlayerService::AudioOutput::getSessionId()
+{
+    return mSessionId;
+}
+
 #undef LOG_TAG
 #define LOG_TAG "AudioCache"
 MediaPlayerService::AudioCache::AudioCache(const char* name) :
@@ -1733,4 +1738,9 @@ void MediaPlayerService::AudioCache::notify(void* cookie, int msg, int ext1, int
     p->mSignal.signal();
 }
 
+int MediaPlayerService::AudioCache::getSessionId()
+{
+    return 0;
+}
+
 } // namespace android

media/libmediaplayerservice/MediaPlayerService.h

@@ -77,6 +77,7 @@ class MediaPlayerService : public BnMediaPlayerService
         virtual uint32_t        latency() const;
         virtual float           msecsPerFrame() const;
         virtual status_t        getPosition(uint32_t *position);
+        virtual int             getSessionId();
 
         virtual status_t        open(
                 uint32_t sampleRate, int channelCount,
@@ -133,6 +134,7 @@ class MediaPlayerService : public BnMediaPlayerService
         virtual uint32_t        latency() const;
         virtual float           msecsPerFrame() const;
         virtual status_t        getPosition(uint32_t *position);
+        virtual int             getSessionId();
 
         virtual status_t        open(
                 uint32_t sampleRate, int channelCount, int format,