SoundPool: Use caller thread for sound playback

A worker playback thread may be starved under high usage situations
such as screenshots or camera snapshots.

Also fix issue with caller thread playback when reusing stream on restart queue.

Test: camera snapshot, screenshot
Test: native soundpool_stress
Test: android.media.cts.SoundPool*Test
Bug: 143448491
Bug: 144540753
Change-Id: I126c3efffc1f1dfb0fcde7a71cdea64afbe0af0a

media/jni/soundpool/StreamManager.cpp

@@ -38,7 +38,7 @@ static constexpr bool kStealActiveStream_OldestFirst = true;
 // kPlayOnCallingThread = true prior to R.
 // Changing to false means calls to play() are almost instantaneous instead of taking around
 // ~10ms to launch the AudioTrack. It is perhaps 100x faster.
-static constexpr bool kPlayOnCallingThread = false;
+static constexpr bool kPlayOnCallingThread = true;
 
 // Amount of time for a StreamManager thread to wait before closing.
 static constexpr int64_t kWaitTimeBeforeCloseNs = 9 * NANOS_PER_SECOND;
@@ -167,6 +167,7 @@ int32_t StreamManager::queueForPlay(const std::shared_ptr<Sound> &sound,
                 if (!stream->getPairStream()->hasSound()) {
                     if (stream->getSoundID() == soundID) {
                         newStream = stream;
+                        fromAvailableQueue = false;
                         break;
                     } else if (newStream == nullptr) {
                         newStream = stream;