Add support for scaling mode parameter

Support VISUALIZER_PARAM__SCALING_MODE parameter.

Modify process() function to use new volume scaling parameter,
 used to set whether captured values are maximized by current
 headroom in the buffer (default existing behaviora) or left
 as is and thus affected by volume.

Modify AudioEffect to allow subclasses to override the following
 events: control status changed, enable status changed, command
 executed.
In Visualizer class (a subclass of AudioEffect), reset the
 scaling mode and capture size on the actual effect
 as cached when control is regained.
 This will allow the effect to be properly
 configured whenever Visualizers with different scaling
 modes or capture sizes are released (e.g. from java
 release() method).

Change-Id: I05cb9f925a296dceca91bafa9fe294ef2b2c2bd5

1 files changed, 11 insertions, 0 deletions

diff --git a/include/media/Visualizer.h b/include/media/Visualizer.h
index 60fa15b..fdec5ee 100644
--- a/include/media/Visualizer.h
+++ b/include/media/Visualizer.h
@@ -108,6 +108,12 @@ public:
     // returns the sampling rate of the audio being captured
     uint32_t getSamplingRate() { return mSampleRate; }
 
+    // set the way volume affects the captured data
+    // mode must one of VISUALIZER_SCALING_MODE_NORMALIZED,
+    //  VISUALIZER_SCALING_MODE_AS_PLAYED
+    status_t setScalingMode(uint32_t mode);
+    uint32_t getScalingMode() { return mScalingMode; }
+
     // return a capture in PCM 8 bit unsigned format. The size of the capture is equal to
     // getCaptureSize()
     status_t getWaveForm(uint8_t *waveform);
@@ -117,6 +123,10 @@ public:
     // are returned
     status_t getFft(uint8_t *fft);
 
+protected:
+    // from IEffectClient
+    virtual void controlStatusChanged(bool controlGranted);
+
 private:
 
     static const uint32_t CAPTURE_RATE_MAX = 20000;
@@ -147,6 +157,7 @@ private:
     uint32_t mCaptureRate;
     uint32_t mCaptureSize;
     uint32_t mSampleRate;
+    uint32_t mScalingMode;
     capture_cbk_t mCaptureCallBack;
     void *mCaptureCbkUser;
     sp<CaptureThread> mCaptureThread;