Clean up Track constructor

The 'thread' parameter can never be NULL.
Use constructor initialization list when possible.
Make more members const.
Only put the relevant code under "if (mCblk != NULL)".
Add comment about track name leak.

Change-Id: Ib963390a69bed1999638cc982a759edd1d5f4712

2 files changed, 16 insertions, 12 deletions

diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index d83d19a..e472a45 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -3479,23 +3479,27 @@ AudioFlinger::PlaybackThread::Track::Track(
             const sp<IMemory>& sharedBuffer,
             int sessionId)
     :   TrackBase(thread, client, sampleRate, format, channelMask, frameCount, sharedBuffer, sessionId),
-    mMute(false), mSharedBuffer(sharedBuffer), mName(-1), mMainBuffer(NULL), mAuxBuffer(NULL),
+    mMute(false),
+    // mFillingUpStatus ?
+    // mRetryCount initialized later when needed
+    mSharedBuffer(sharedBuffer),
+    mStreamType(streamType),
+    mName(-1),  // see note below
+    mMainBuffer(thread->mixBuffer()),
+    mAuxBuffer(NULL),
     mAuxEffectId(0), mHasVolumeController(false)
 {
     if (mCblk != NULL) {
-        if (thread != NULL) {
-            mName = thread->getTrackName_l();
-            mMainBuffer = thread->mixBuffer();
-        }
-        ALOGV("Track constructor name %d, calling pid %d", mName, IPCThreadState::self()->getCallingPid());
-        if (mName < 0) {
-            ALOGE("no more track names available");
-        }
-        mStreamType = streamType;
         // NOTE: audio_track_cblk_t::frameSize for 8 bit PCM data is based on a sample size of
         // 16 bit because data is converted to 16 bit before being stored in buffer by AudioTrack
         mCblk->frameSize = audio_is_linear_pcm(format) ? mChannelCount * sizeof(int16_t) : sizeof(uint8_t);
+        // to avoid leaking a track name, do not allocate one unless there is an mCblk
+        mName = thread->getTrackName_l();
+        if (mName < 0) {
+            ALOGE("no more track names available");
+        }
     }
+    ALOGV("Track constructor name %d, calling pid %d", mName, IPCThreadState::self()->getCallingPid());
 }
 
 AudioFlinger::PlaybackThread::Track::~Track()
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 0e4b24a..b75d3a1 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -681,9 +681,9 @@ private:
             enum {FS_FILLING, FS_FILLED, FS_ACTIVE};
             mutable uint8_t     mFillingUpStatus;
             int8_t              mRetryCount;
-            sp<IMemory>         mSharedBuffer;
+            const sp<IMemory>   mSharedBuffer;
             bool                mResetDone;
-            audio_stream_type_t mStreamType;
+            const audio_stream_type_t mStreamType;
             int                 mName;
             int16_t             *mMainBuffer;
             int32_t             *mAuxBuffer;