AudioFlinger: createEffect always look for same session effect chain.

Test: CTS AudioEffect tests
Bug: 128630419
Change-Id: Ieb08abfcb7a983e05fa8f25f6609468d9bd4620b

services/audioflinger/AudioFlinger.cpp

@@ -3278,31 +3278,12 @@ sp<IEffect> AudioFlinger::createEffect(
                 goto Exit;
             }
             // look for the thread where the specified audio session is present
-            for (size_t i = 0; i < mPlaybackThreads.size(); i++) {
-                uint32_t sessionType = mPlaybackThreads.valueAt(i)->hasAudioSession(sessionId);
-                if (sessionType != 0) {
-                    io = mPlaybackThreads.keyAt(i);
-                    // thread with same effect session is preferable
-                    if ((sessionType & ThreadBase::EFFECT_SESSION) != 0) {
-                        break;
-                    }
-                }
-            }
+            io = findIoHandleBySessionId_l(sessionId, mPlaybackThreads);
             if (io == AUDIO_IO_HANDLE_NONE) {
-                for (size_t i = 0; i < mRecordThreads.size(); i++) {
-                    if (mRecordThreads.valueAt(i)->hasAudioSession(sessionId) != 0) {
-                        io = mRecordThreads.keyAt(i);
-                        break;
-                    }
-                }
+                io = findIoHandleBySessionId_l(sessionId, mRecordThreads);
             }
             if (io == AUDIO_IO_HANDLE_NONE) {
-                for (size_t i = 0; i < mMmapThreads.size(); i++) {
-                    if (mMmapThreads.valueAt(i)->hasAudioSession(sessionId) != 0) {
-                        io = mMmapThreads.keyAt(i);
-                        break;
-                    }
-                }
+                io = findIoHandleBySessionId_l(sessionId, mMmapThreads);
             }
             // If no output thread contains the requested session ID, default to
             // first output. The effect chain will be moved to the correct output

services/audioflinger/AudioFlinger.h

@@ -558,6 +558,26 @@ using effect_buffer_t = int16_t;
 
 #include "PatchPanel.h"
 
+    // Find io handle by session id.
+    // Preference is given to an io handle with a matching effect chain to session id.
+    // If none found, AUDIO_IO_HANDLE_NONE is returned.
+    template <typename T>
+    static audio_io_handle_t findIoHandleBySessionId_l(
+            audio_session_t sessionId, const T& threads) {
+        audio_io_handle_t io = AUDIO_IO_HANDLE_NONE;
+
+        for (size_t i = 0; i < threads.size(); i++) {
+            const uint32_t sessionType = threads.valueAt(i)->hasAudioSession(sessionId);
+            if (sessionType != 0) {
+                io = threads.keyAt(i);
+                if ((sessionType & AudioFlinger::ThreadBase::EFFECT_SESSION) != 0) {
+                    break; // effect chain here.
+                }
+            }
+        }
+        return io;
+    }
+
     // server side of the client's IAudioTrack
     class TrackHandle : public android::BnAudioTrack {
     public: