Fix issue 3479042.

The problem is that when an AudioRecord using the resampler is restarted,
the resampler state is not reset (as there is no reset function in the resampler).
The consequence is that the first time the record thread loop runs, it calls the resampler
which consumes the remaining data in the input buffer and when this buffer is released
the input index is incremented over the limit.

The fix consists in implementing a reset function in the resampler.

A similar problem was also present for playback but unoticed because the track buffer is always
drained by the mixer when a track stops. The only problem for playback was that the initial
phase fraction was wrong when restarting a track after stop (it was correct after a pause).

Change-Id: Ifc2585d685f4402d29f4afc63f6efd1d69265de3

1 files changed, 2 insertions, 0 deletions

diff --git a/services/audioflinger/AudioResampler.h b/services/audioflinger/AudioResampler.h
index 2dfac76..9f06c1c 100644
--- a/services/audioflinger/AudioResampler.h
+++ b/services/audioflinger/AudioResampler.h
@@ -53,6 +53,8 @@ public:
     virtual void resample(int32_t* out, size_t outFrameCount,
             AudioBufferProvider* provider) = 0;
 
+    virtual void reset();
+
 protected:
     // number of bits for phase fraction - 30 bits allows nearly 2x downsampling
     static const int kNumPhaseBits = 30;