Track maximum amplitude and fix getMaxAmplitude()

- only start to track the max amplitude after the first call to getMaxAmplitude()

Change-Id: I64d3d9ca0542202a8535a211425e8bccceca50fc

1 files changed, 7 insertions, 0 deletions

diff --git a/include/media/stagefright/AudioSource.h b/include/media/stagefright/AudioSource.h
index f2001e1..628200d 100644
--- a/include/media/stagefright/AudioSource.h
+++ b/include/media/stagefright/AudioSource.h
@@ -39,6 +39,9 @@ struct AudioSource : public MediaSource {
     virtual status_t stop();
     virtual sp<MetaData> getFormat();
 
+    // Returns the maximum amplitude since last call.
+    int16_t getMaxAmplitude();
+
     virtual status_t read(
             MediaBuffer **buffer, const ReadOptions *options = NULL);
 
@@ -53,13 +56,17 @@ private:
     bool mStarted;
 
     bool mCollectStats;
+    bool mTrackMaxAmplitude;
     int64_t mTotalReadTimeUs;
     int64_t mTotalReadBytes;
     int64_t mTotalReads;
     int64_t mStartTimeUs;
+    int16_t mMaxAmplitude;
 
     MediaBufferGroup *mGroup;
 
+    void trackMaxAmplitude(int16_t *data, int nSamples);
+
     AudioSource(const AudioSource &);
     AudioSource &operator=(const AudioSource &);
 };