AAudio AudioStreamLegacy: refine handling of AudioTrack teardown

Do not systematically request a stream disconnect upon
EVENT_NEW_IAUDIOTRACK received AudioTrack but only if the new
audio Track properties have changed in such a way that the initial
contract is broken.

Bug: 139763500
Test: OboeTester TEST DISCONNECT
Test: OboeTester TEST OUTPUT while enabling/disabling Live Caption
Change-Id: I3b43275a888e23471fcd1ce20725f5731a77a255

media/libaaudio/src/legacy/AudioStreamTrack.cpp

@@ -215,6 +215,9 @@ aaudio_result_t AudioStreamTrack::open(const AudioStreamBuilder& builder)
             : (aaudio_session_id_t) mAudioTrack->getSessionId();
     setSessionId(actualSessionId);
 
+    mInitialBufferCapacity = getBufferCapacity();
+    mInitialFramesPerBurst = getFramesPerBurst();
+
     mAudioTrack->addAudioDeviceCallback(mDeviceCallback);
 
     // Update performance mode based on the actual stream flags.
@@ -265,7 +268,16 @@ void AudioStreamTrack::processCallback(int event, void *info) {
 
             // Stream got rerouted so we disconnect.
         case AudioTrack::EVENT_NEW_IAUDIOTRACK:
-            processCallbackCommon(AAUDIO_CALLBACK_OPERATION_DISCONNECTED, info);
+            // request stream disconnect if the restored AudioTrack has properties not matching
+            // what was requested initially
+            if (mAudioTrack->channelCount() != getSamplesPerFrame()
+                    || mAudioTrack->format() != getFormat()
+                    || mAudioTrack->getSampleRate() != getSampleRate()
+                    || mAudioTrack->getRoutedDeviceId() != getDeviceId()
+                    || getBufferCapacity() != mInitialBufferCapacity
+                    || getFramesPerBurst() != mInitialFramesPerBurst) {
+                processCallbackCommon(AAUDIO_CALLBACK_OPERATION_DISCONNECTED, info);
+            }
             break;
 
         default:

media/libaaudio/src/legacy/AudioStreamTrack.h

@@ -104,6 +104,10 @@ private:
 
     // TODO add 64-bit position reporting to AudioTrack and use it.
     aaudio_wrapping_frames_t         mPositionWhenPausing = 0;
+
+    // initial AudioTrack frame count and notification period
+    int32_t mInitialBufferCapacity = 0;
+    int32_t mInitialFramesPerBurst = 0;
 };
 
 } /* namespace aaudio */