am ec78f551: Add avg bandwidth estimate every 2 seconds - do not merge.

* commit 'ec78f551b575b0274cbe796f8e08a9df1a706680':
  Add avg bandwidth estimate every 2 seconds - do not merge.

media/libstagefright/NuHTTPDataSource.cpp

@@ -100,6 +100,7 @@ NuHTTPDataSource::NuHTTPDataSource(uint32_t flags)
       mNumBandwidthHistoryItems(0),
       mTotalTransferTimeUs(0),
       mTotalTransferBytes(0),
+      mPrevBandwidthMeasureTimeUs(0),
       mDecryptHandle(NULL),
       mDrmManagerClient(NULL) {
 }
@@ -534,6 +535,16 @@ void NuHTTPDataSource::addBandwidthMeasurement_l(
         mTotalTransferBytes -= entry->mNumBytes;
         mBandwidthHistory.erase(mBandwidthHistory.begin());
         --mNumBandwidthHistoryItems;
+        int64_t timeNowUs = ALooper::GetNowUs();
+        if (timeNowUs - mPrevBandwidthMeasureTimeUs > 2000000LL) {
+            if (mPrevBandwidthMeasureTimeUs != 0) {
+                double estimatedBandwidth =
+                    ((double)mTotalTransferBytes * 8E3 / mTotalTransferTimeUs);
+                LOGI("estimated avg bandwidth is %8.2f kbps in the past %lld us",
+                    estimatedBandwidth, timeNowUs - mPrevBandwidthMeasureTimeUs);
+            }
+            mPrevBandwidthMeasureTimeUs = timeNowUs;
+        }
     }
 }
 

media/libstagefright/include/NuHTTPDataSource.h

@@ -97,6 +97,7 @@ private:
     size_t mNumBandwidthHistoryItems;
     int64_t mTotalTransferTimeUs;
     size_t mTotalTransferBytes;
+    int64_t mPrevBandwidthMeasureTimeUs;
 
     DecryptHandle *mDecryptHandle;
     DrmManagerClient *mDrmManagerClient;