update offloaded audio track sampling rate

AudioPlayer must read the sampling rate from offloaded audio sinks
whenever a new time position is computed as the decoder can update
the sampling rate on the fly.

Bug: 12823955.

Change-Id: I997e5248cfd4017aeceb4e11689324ded2a5bc88

1 files changed, 13 insertions, 0 deletions

diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 7c4a990..1ab8693 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -603,6 +603,19 @@ uint32_t AudioTrack::getSampleRate() const
     }
 
     AutoMutex lock(mLock);
+
+    // sample rate can be updated during playback by the offloaded decoder so we need to
+    // query the HAL and update if needed.
+// FIXME use Proxy return channel to update the rate from server and avoid polling here
+    if (isOffloaded()) {
+        if (mOutput != 0) {
+            uint32_t sampleRate = 0;
+            status_t status = AudioSystem::getSamplingRate(mOutput, mStreamType, &sampleRate);
+            if (status == NO_ERROR) {
+                mSampleRate = sampleRate;
+            }
+        }
+    }
     return mSampleRate;
 }