diff --git a/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp b/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp
index 97672a0..959db61 100644
--- a/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp
+++ b/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp
@@ -56,6 +56,8 @@
     if (status != NO_ERROR) goto error;
     status = parcel->writeInt32((int32_t) getInputPreset());
     if (status != NO_ERROR) goto error;
+    status = parcel->writeInt32(getSessionId());
+    if (status != NO_ERROR) goto error;
     return NO_ERROR;
 error:
     ALOGE("AAudioStreamConfiguration.writeToParcel(): write failed = %d", status);
@@ -94,6 +96,9 @@
     status = parcel->readInt32(&value);
     if (status != NO_ERROR) goto error;
     setInputPreset((aaudio_input_preset_t) value);
+    status = parcel->readInt32(&value);
+    if (status != NO_ERROR) goto error;
+    setSessionId(value);
     return NO_ERROR;
 error:
     ALOGE("AAudioStreamConfiguration.readFromParcel(): read failed = %d", status);
diff --git a/media/libaaudio/src/client/AudioStreamInternal.cpp b/media/libaaudio/src/client/AudioStreamInternal.cpp
index 5856ec3..4980e97 100644
--- a/media/libaaudio/src/client/AudioStreamInternal.cpp
+++ b/media/libaaudio/src/client/AudioStreamInternal.cpp
@@ -133,6 +133,7 @@
     setSampleRate(configurationOutput.getSampleRate());
     setSamplesPerFrame(configurationOutput.getSamplesPerFrame());
     setDeviceId(configurationOutput.getDeviceId());
+    setSessionId(configurationOutput.getSessionId());
     setSharingMode(configurationOutput.getSharingMode());
 
     setUsage(configurationOutput.getUsage());
diff --git a/media/libaaudio/src/core/AAudioAudio.cpp b/media/libaaudio/src/core/AAudioAudio.cpp
index 9e5ca8e..df0db79 100644
--- a/media/libaaudio/src/core/AAudioAudio.cpp
+++ b/media/libaaudio/src/core/AAudioAudio.cpp
@@ -196,12 +196,19 @@
 }
 
 AAUDIO_API void AAudioStreamBuilder_setBufferCapacityInFrames(AAudioStreamBuilder* builder,
-                                                        int32_t frames)
+                                                              int32_t frames)
 {
     AudioStreamBuilder *streamBuilder = convertAAudioBuilderToStreamBuilder(builder);
     streamBuilder->setBufferCapacity(frames);
 }
 
+AAUDIO_API void AAudioStreamBuilder_setSessionId(AAudioStreamBuilder* builder,
+                                                 aaudio_session_id_t sessionId)
+{
+    AudioStreamBuilder *streamBuilder = convertAAudioBuilderToStreamBuilder(builder);
+    streamBuilder->setSessionId(sessionId);
+}
+
 AAUDIO_API void AAudioStreamBuilder_setDataCallback(AAudioStreamBuilder* builder,
                                                     AAudioStream_dataCallback callback,
                                                     void *userData)
@@ -483,6 +490,12 @@
     return audioStream->getInputPreset();
 }
 
+AAUDIO_API int32_t AAudioStream_getSessionId(AAudioStream* stream)
+{
+    AudioStream *audioStream = convertAAudioStreamToAudioStream(stream);
+    return audioStream->getSessionId();
+}
+
 AAUDIO_API int64_t AAudioStream_getFramesWritten(AAudioStream* stream)
 {
     AudioStream *audioStream = convertAAudioStreamToAudioStream(stream);
diff --git a/media/libaaudio/src/core/AAudioStreamParameters.cpp b/media/libaaudio/src/core/AAudioStreamParameters.cpp
index 23c4eb8..9645ea8 100644
--- a/media/libaaudio/src/core/AAudioStreamParameters.cpp
+++ b/media/libaaudio/src/core/AAudioStreamParameters.cpp
@@ -38,6 +38,7 @@
     mSamplesPerFrame = other.mSamplesPerFrame;
     mSampleRate      = other.mSampleRate;
     mDeviceId        = other.mDeviceId;
+    mSessionId       = other.mSessionId;
     mSharingMode     = other.mSharingMode;
     mAudioFormat     = other.mAudioFormat;
     mDirection       = other.mDirection;
@@ -59,6 +60,15 @@
         return AAUDIO_ERROR_OUT_OF_RANGE;
     }
 
+    // All Session ID values are legal.
+    switch (mSessionId) {
+        case AAUDIO_SESSION_ID_NONE:
+        case AAUDIO_SESSION_ID_ALLOCATE:
+            break;
+        default:
+            break;
+    }
+
     switch (mSharingMode) {
         case AAUDIO_SHARING_MODE_EXCLUSIVE:
         case AAUDIO_SHARING_MODE_SHARED:
@@ -154,6 +164,7 @@
 
 void AAudioStreamParameters::dump() const {
     ALOGD("mDeviceId        = %6d", mDeviceId);
+    ALOGD("mSessionId       = %6d", mSessionId);
     ALOGD("mSampleRate      = %6d", mSampleRate);
     ALOGD("mSamplesPerFrame = %6d", mSamplesPerFrame);
     ALOGD("mSharingMode     = %6d", (int)mSharingMode);
@@ -164,4 +175,3 @@
     ALOGD("mContentType     = %6d", mContentType);
     ALOGD("mInputPreset     = %6d", mInputPreset);
 }
-
diff --git a/media/libaaudio/src/core/AAudioStreamParameters.h b/media/libaaudio/src/core/AAudioStreamParameters.h
index 0c173f5..ce5dacd 100644
--- a/media/libaaudio/src/core/AAudioStreamParameters.h
+++ b/media/libaaudio/src/core/AAudioStreamParameters.h
@@ -112,6 +112,14 @@
         mInputPreset = inputPreset;
     }
 
+    aaudio_session_id_t getSessionId() const {
+        return mSessionId;
+    }
+
+    void setSessionId(aaudio_session_id_t sessionId) {
+        mSessionId = sessionId;
+    }
+
     int32_t calculateBytesPerFrame() const {
         return getSamplesPerFrame() * AAudioConvert_formatToSizeInBytes(getFormat());
     }
@@ -137,6 +145,7 @@
     aaudio_content_type_t      mContentType     = AAUDIO_UNSPECIFIED;
     aaudio_input_preset_t      mInputPreset     = AAUDIO_UNSPECIFIED;
     int32_t                    mBufferCapacity  = AAUDIO_UNSPECIFIED;
+    aaudio_session_id_t        mSessionId       = AAUDIO_SESSION_ID_NONE;
 };
 
 } /* namespace aaudio */
diff --git a/media/libaaudio/src/core/AudioStream.cpp b/media/libaaudio/src/core/AudioStream.cpp
index 1b2ca39..82c0667 100644
--- a/media/libaaudio/src/core/AudioStream.cpp
+++ b/media/libaaudio/src/core/AudioStream.cpp
@@ -108,8 +108,10 @@
           mSampleRate, mSamplesPerFrame, mFormat,
           AudioStream_convertSharingModeToShortText(mSharingMode),
           (getDirection() == AAUDIO_DIRECTION_OUTPUT) ? "OUTPUT" : "INPUT");
-    ALOGI("open() device = %d, perfMode = %d, callback: %s with frames = %d",
-          mDeviceId, mPerformanceMode,
+    ALOGI("open() device = %d, sessionId = %d, perfMode = %d, callback: %s with frames = %d",
+          mDeviceId,
+          mSessionId,
+          mPerformanceMode,
           (isDataCallbackSet() ? "ON" : "OFF"),
           mFramesPerDataCallback);
     ALOGI("open() usage = %d, contentType = %d, inputPreset = %d",
diff --git a/media/libaaudio/src/core/AudioStream.h b/media/libaaudio/src/core/AudioStream.h
index 21fa595..42b585f 100644
--- a/media/libaaudio/src/core/AudioStream.h
+++ b/media/libaaudio/src/core/AudioStream.h
@@ -216,6 +216,10 @@
         return mInputPreset;
     }
 
+    int32_t getSessionId() const {
+        return mSessionId;
+    }
+
     /**
      * This is only valid after setSamplesPerFrame() and setFormat() have been called.
      */
@@ -455,10 +459,15 @@
         mDeviceId = deviceId;
     }
 
+    void setSessionId(int32_t sessionId) {
+        mSessionId = sessionId;
+    }
+
     std::atomic<bool>    mCallbackEnabled{false};
 
     float                mDuckAndMuteVolume = 1.0f;
 
+
 protected:
 
     void setPeriodNanoseconds(int64_t periodNanoseconds) {
@@ -505,10 +514,13 @@
     aaudio_format_t             mFormat = AAUDIO_FORMAT_UNSPECIFIED;
     aaudio_stream_state_t       mState = AAUDIO_STREAM_STATE_UNINITIALIZED;
     aaudio_performance_mode_t   mPerformanceMode = AAUDIO_PERFORMANCE_MODE_NONE;
+
     aaudio_usage_t              mUsage           = AAUDIO_USAGE_MEDIA;
     aaudio_content_type_t       mContentType     = AAUDIO_CONTENT_TYPE_MUSIC;
     aaudio_input_preset_t       mInputPreset     = AAUDIO_INPUT_PRESET_GENERIC;
 
+    int32_t                     mSessionId = AAUDIO_UNSPECIFIED;
+
     // callback ----------------------------------
 
     AAudioStream_dataCallback   mDataCallbackProc = nullptr;  // external callback functions
diff --git a/media/libaaudio/src/core/AudioStreamBuilder.cpp b/media/libaaudio/src/core/AudioStreamBuilder.cpp
index f7cb8d6..293a6a8 100644
--- a/media/libaaudio/src/core/AudioStreamBuilder.cpp
+++ b/media/libaaudio/src/core/AudioStreamBuilder.cpp
@@ -141,6 +141,13 @@
     // TODO Support other performance settings in MMAP mode.
     // Disable MMAP if low latency not requested.
     if (getPerformanceMode() != AAUDIO_PERFORMANCE_MODE_LOW_LATENCY) {
+        ALOGD("build() MMAP not available because AAUDIO_PERFORMANCE_MODE_LOW_LATENCY not used.");
+        allowMMap = false;
+    }
+
+    // SessionID and Effects are only supported in Legacy mode.
+    if (getSessionId() != AAUDIO_SESSION_ID_NONE) {
+        ALOGD("build() MMAP not available because sessionId used.");
         allowMMap = false;
     }
 
diff --git a/media/libaaudio/src/legacy/AudioStreamRecord.cpp b/media/libaaudio/src/legacy/AudioStreamRecord.cpp
index 5f4ab9b..61a0f8a 100644
--- a/media/libaaudio/src/legacy/AudioStreamRecord.cpp
+++ b/media/libaaudio/src/legacy/AudioStreamRecord.cpp
@@ -117,6 +117,9 @@
             .tags = ""
     };
 
+    aaudio_session_id_t requestedSessionId = builder.getSessionId();
+    audio_session_t sessionId = AAudioConvert_aaudioToAndroidSessionId(requestedSessionId);
+
     mAudioRecord = new AudioRecord(
             mOpPackageName // const String16& opPackageName TODO does not compile
             );
@@ -130,7 +133,7 @@
             callbackData,
             notificationFrames,
             false /*threadCanCallJava*/,
-            AUDIO_SESSION_ALLOCATE,
+            sessionId,
             streamTransferType,
             flags,
             AUDIO_UID_INVALID, // DEFAULT uid
@@ -189,6 +192,13 @@
 
     setState(AAUDIO_STREAM_STATE_OPEN);
     setDeviceId(mAudioRecord->getRoutedDeviceId());
+
+    aaudio_session_id_t actualSessionId =
+            (requestedSessionId == AAUDIO_SESSION_ID_NONE)
+            ? AAUDIO_SESSION_ID_NONE
+            : (aaudio_session_id_t) mAudioRecord->getSessionId();
+    setSessionId(actualSessionId);
+
     mAudioRecord->addAudioDeviceCallback(mDeviceCallback);
 
     return AAUDIO_OK;
diff --git a/media/libaaudio/src/legacy/AudioStreamTrack.cpp b/media/libaaudio/src/legacy/AudioStreamTrack.cpp
index 17a8d52..52c7822 100644
--- a/media/libaaudio/src/legacy/AudioStreamTrack.cpp
+++ b/media/libaaudio/src/legacy/AudioStreamTrack.cpp
@@ -134,6 +134,11 @@
             .tags = ""
     };
 
+    static_assert(AAUDIO_UNSPECIFIED == AUDIO_SESSION_ALLOCATE, "Session IDs should match");
+
+    aaudio_session_id_t requestedSessionId = builder.getSessionId();
+    audio_session_t sessionId = AAudioConvert_aaudioToAndroidSessionId(requestedSessionId);
+
     mAudioTrack = new AudioTrack();
     mAudioTrack->set(
             AUDIO_STREAM_DEFAULT,  // ignored because we pass attributes below
@@ -147,7 +152,7 @@
             notificationFrames,
             0,       // DEFAULT sharedBuffer*/,
             false,   // DEFAULT threadCanCallJava
-            AUDIO_SESSION_ALLOCATE,
+            sessionId,
             streamTransferType,
             NULL,    // DEFAULT audio_offload_info_t
             AUDIO_UID_INVALID, // DEFAULT uid
@@ -193,6 +198,13 @@
 
     setState(AAUDIO_STREAM_STATE_OPEN);
     setDeviceId(mAudioTrack->getRoutedDeviceId());
+
+    aaudio_session_id_t actualSessionId =
+            (requestedSessionId == AAUDIO_SESSION_ID_NONE)
+            ? AAUDIO_SESSION_ID_NONE
+            : (aaudio_session_id_t) mAudioTrack->getSessionId();
+    setSessionId(actualSessionId);
+
     mAudioTrack->addAudioDeviceCallback(mDeviceCallback);
 
     // Update performance mode based on the actual stream flags.
diff --git a/media/libaaudio/src/utility/AAudioUtilities.cpp b/media/libaaudio/src/utility/AAudioUtilities.cpp
index c6adf33..2bee6e3 100644
--- a/media/libaaudio/src/utility/AAudioUtilities.cpp
+++ b/media/libaaudio/src/utility/AAudioUtilities.cpp
@@ -250,6 +250,13 @@
     return result;
 }
 
+audio_session_t AAudioConvert_aaudioToAndroidSessionId(aaudio_session_id_t sessionId) {
+    // If not a valid sessionId then convert to a safe value of AUDIO_SESSION_ALLOCATE.
+    return (sessionId < AAUDIO_SESSION_ID_MIN)
+           ? AUDIO_SESSION_ALLOCATE
+           : (audio_session_t) sessionId;
+}
+
 audio_format_t AAudioConvert_aaudioToAndroidDataFormat(aaudio_format_t aaudioFormat) {
     audio_format_t androidFormat;
     switch (aaudioFormat) {
diff --git a/media/libaaudio/src/utility/AAudioUtilities.h b/media/libaaudio/src/utility/AAudioUtilities.h
index f2347f5..0c59f6d 100644
--- a/media/libaaudio/src/utility/AAudioUtilities.h
+++ b/media/libaaudio/src/utility/AAudioUtilities.h
@@ -27,6 +27,9 @@
 
 #include "aaudio/AAudio.h"
 
+
+constexpr aaudio_session_id_t AAUDIO_SESSION_ID_MIN = 1; // must be positive
+
 /**
  * Convert an AAudio result into the closest matching Android status.
  */
@@ -38,6 +41,13 @@
 aaudio_result_t AAudioConvert_androidToAAudioResult(android::status_t status);
 
 /**
+ * Convert an aaudio_session_id_t to a value that is safe to pass to AudioFlinger.
+ * @param sessionId
+ * @return safe value
+ */
+audio_session_t AAudioConvert_aaudioToAndroidSessionId(aaudio_session_id_t sessionId);
+
+/**
  * Convert an array of floats to an array of int16_t.
  *
  * @param source