diff --git a/media/libaaudio/src/Android.mk b/media/libaaudio/src/Android.mk
index 7131c6c..cfcf27a 100644
--- a/media/libaaudio/src/Android.mk
+++ b/media/libaaudio/src/Android.mk
@@ -32,6 +32,7 @@
     core/AudioStream.cpp \
     core/AudioStreamBuilder.cpp \
     core/AAudioAudio.cpp \
+    core/AAudioStreamParameters.cpp \
     legacy/AudioStreamLegacy.cpp \
     legacy/AudioStreamRecord.cpp \
     legacy/AudioStreamTrack.cpp \
@@ -90,6 +91,7 @@
 LOCAL_SRC_FILES = core/AudioStream.cpp \
     core/AudioStreamBuilder.cpp \
     core/AAudioAudio.cpp \
+    core/AAudioStreamParameters.cpp \
     legacy/AudioStreamLegacy.cpp \
     legacy/AudioStreamRecord.cpp \
     legacy/AudioStreamTrack.cpp \
diff --git a/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp b/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp
index 44edb1d..e763934 100644
--- a/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp
+++ b/media/libaaudio/src/binding/AAudioStreamConfiguration.cpp
@@ -36,17 +36,17 @@
 
 status_t AAudioStreamConfiguration::writeToParcel(Parcel* parcel) const {
     status_t status;
-    status = parcel->writeInt32(mDeviceId);
+    status = parcel->writeInt32(getDeviceId());
     if (status != NO_ERROR) goto error;
-    status = parcel->writeInt32(mSampleRate);
+    status = parcel->writeInt32(getSampleRate());
     if (status != NO_ERROR) goto error;
-    status = parcel->writeInt32(mSamplesPerFrame);
+    status = parcel->writeInt32(getSamplesPerFrame());
     if (status != NO_ERROR) goto error;
-    status = parcel->writeInt32((int32_t) mSharingMode);
+    status = parcel->writeInt32((int32_t) getSharingMode());
     if (status != NO_ERROR) goto error;
-    status = parcel->writeInt32((int32_t) mAudioFormat);
+    status = parcel->writeInt32((int32_t) getFormat());
     if (status != NO_ERROR) goto error;
-    status = parcel->writeInt32(mBufferCapacity);
+    status = parcel->writeInt32(getBufferCapacity());
     if (status != NO_ERROR) goto error;
     return NO_ERROR;
 error:
@@ -55,57 +55,27 @@
 }
 
 status_t AAudioStreamConfiguration::readFromParcel(const Parcel* parcel) {
-    status_t status = parcel->readInt32(&mDeviceId);
+    int32_t value;
+    status_t status = parcel->readInt32(&value);
     if (status != NO_ERROR) goto error;
-    status = parcel->readInt32(&mSampleRate);
+    setDeviceId(value);
+    status = parcel->readInt32(&value);
     if (status != NO_ERROR) goto error;
-    status = parcel->readInt32(&mSamplesPerFrame);
+    setSampleRate(value);
+    status = parcel->readInt32(&value);
     if (status != NO_ERROR) goto error;
-    status = parcel->readInt32(&mSharingMode);
+    setSamplesPerFrame(value);
+    status = parcel->readInt32(&value);
     if (status != NO_ERROR) goto error;
-    status = parcel->readInt32(&mAudioFormat);
+    setSharingMode(value);
+    status = parcel->readInt32(&value);
     if (status != NO_ERROR) goto error;
-    status = parcel->readInt32(&mBufferCapacity);
+    setFormat(value);
+    status = parcel->readInt32(&value);
     if (status != NO_ERROR) goto error;
+    setBufferCapacity(value);
     return NO_ERROR;
 error:
     ALOGE("AAudioStreamConfiguration.readFromParcel(): read failed = %d", status);
     return status;
-}
-
-aaudio_result_t AAudioStreamConfiguration::validate() const {
-    // Validate results of the open.
-    if (mSampleRate < 0 || mSampleRate >= 8 * 48000) { // TODO review limits
-        ALOGE("AAudioStreamConfiguration.validate(): invalid sampleRate = %d", mSampleRate);
-        return AAUDIO_ERROR_INTERNAL;
-    }
-
-    if (mSamplesPerFrame < 1 || mSamplesPerFrame >= 32) { // TODO review limits
-        ALOGE("AAudioStreamConfiguration.validate() invalid samplesPerFrame = %d", mSamplesPerFrame);
-        return AAUDIO_ERROR_INTERNAL;
-    }
-
-    switch (mAudioFormat) {
-    case AAUDIO_FORMAT_PCM_I16:
-    case AAUDIO_FORMAT_PCM_FLOAT:
-        break;
-    default:
-        ALOGE("AAudioStreamConfiguration.validate() invalid audioFormat = %d", mAudioFormat);
-        return AAUDIO_ERROR_INTERNAL;
-    }
-
-    if (mBufferCapacity < 0) {
-        ALOGE("AAudioStreamConfiguration.validate() invalid mBufferCapacity = %d", mBufferCapacity);
-        return AAUDIO_ERROR_INTERNAL;
-    }
-    return AAUDIO_OK;
-}
-
-void AAudioStreamConfiguration::dump() const {
-    ALOGD("AAudioStreamConfiguration mDeviceId        = %d", mDeviceId);
-    ALOGD("AAudioStreamConfiguration mSampleRate      = %d", mSampleRate);
-    ALOGD("AAudioStreamConfiguration mSamplesPerFrame = %d", mSamplesPerFrame);
-    ALOGD("AAudioStreamConfiguration mSharingMode     = %d", (int)mSharingMode);
-    ALOGD("AAudioStreamConfiguration mAudioFormat     = %d", (int)mAudioFormat);
-    ALOGD("AAudioStreamConfiguration mBufferCapacity  = %d", mBufferCapacity);
-}
+}
\ No newline at end of file
diff --git a/media/libaaudio/src/binding/AAudioStreamConfiguration.h b/media/libaaudio/src/binding/AAudioStreamConfiguration.h
index 144595a..b324896 100644
--- a/media/libaaudio/src/binding/AAudioStreamConfiguration.h
+++ b/media/libaaudio/src/binding/AAudioStreamConfiguration.h
@@ -22,6 +22,7 @@
 #include <aaudio/AAudio.h>
 #include <binder/Parcel.h>
 #include <binder/Parcelable.h>
+#include "core/AAudioStreamParameters.h"
 
 using android::status_t;
 using android::Parcel;
@@ -29,74 +30,14 @@
 
 namespace aaudio {
 
-class AAudioStreamConfiguration : public Parcelable {
+class AAudioStreamConfiguration : public AAudioStreamParameters, public Parcelable {
 public:
     AAudioStreamConfiguration();
     virtual ~AAudioStreamConfiguration();
 
-    int32_t getDeviceId() const {
-        return mDeviceId;
-    }
-
-    void setDeviceId(int32_t deviceId) {
-        mDeviceId = deviceId;
-    }
-
-    int32_t getSampleRate() const {
-        return mSampleRate;
-    }
-
-    void setSampleRate(int32_t sampleRate) {
-        mSampleRate = sampleRate;
-    }
-
-    int32_t getSamplesPerFrame() const {
-        return mSamplesPerFrame;
-    }
-
-    void setSamplesPerFrame(int32_t samplesPerFrame) {
-        mSamplesPerFrame = samplesPerFrame;
-    }
-
-    aaudio_format_t getAudioFormat() const {
-        return mAudioFormat;
-    }
-
-    void setAudioFormat(aaudio_format_t audioFormat) {
-        mAudioFormat = audioFormat;
-    }
-
-    aaudio_sharing_mode_t getSharingMode() const {
-        return mSharingMode;
-    }
-
-    void setSharingMode(aaudio_sharing_mode_t sharingMode) {
-        mSharingMode = sharingMode;
-    }
-
-    int32_t getBufferCapacity() const {
-        return mBufferCapacity;
-    }
-
-    void setBufferCapacity(int32_t frames) {
-        mBufferCapacity = frames;
-    }
-
     virtual status_t writeToParcel(Parcel* parcel) const override;
 
     virtual status_t readFromParcel(const Parcel* parcel) override;
-
-    aaudio_result_t validate() const;
-
-    void dump() const;
-
-private:
-    int32_t               mDeviceId        = AAUDIO_UNSPECIFIED;
-    int32_t               mSampleRate      = AAUDIO_UNSPECIFIED;
-    int32_t               mSamplesPerFrame = AAUDIO_UNSPECIFIED;
-    aaudio_sharing_mode_t mSharingMode     = AAUDIO_SHARING_MODE_SHARED;
-    aaudio_format_t       mAudioFormat     = AAUDIO_FORMAT_UNSPECIFIED;
-    int32_t               mBufferCapacity  = AAUDIO_UNSPECIFIED;
 };
 
 } /* namespace aaudio */
diff --git a/media/libaaudio/src/binding/IAAudioService.cpp b/media/libaaudio/src/binding/IAAudioService.cpp
index 97fbaaa..b3c4934 100644
--- a/media/libaaudio/src/binding/IAAudioService.cpp
+++ b/media/libaaudio/src/binding/IAAudioService.cpp
@@ -264,13 +264,19 @@
         case OPEN_STREAM: {
             CHECK_INTERFACE(IAAudioService, data, reply);
             request.readFromParcel(&data);
-            //ALOGD("BnAAudioService::client openStream request dump --------------------");
-            //request.dump();
-            // Override the uid and pid from the client in case they are incorrect.
-            request.setUserId(IPCThreadState::self()->getCallingUid());
-            request.setProcessId(IPCThreadState::self()->getCallingPid());
-            streamHandle = openStream(request, configuration);
-            //ALOGD("BnAAudioService::onTransact OPEN_STREAM server handle = 0x%08X", streamHandle);
+            result = request.validate();
+            if (result != AAUDIO_OK) {
+                streamHandle = result;
+            } else {
+                //ALOGD("BnAAudioService::client openStream request dump --------------------");
+                //request.dump();
+                // Override the uid and pid from the client in case they are incorrect.
+                request.setUserId(IPCThreadState::self()->getCallingUid());
+                request.setProcessId(IPCThreadState::self()->getCallingPid());
+                streamHandle = openStream(request, configuration);
+                //ALOGD("BnAAudioService::onTransact OPEN_STREAM server handle = 0x%08X",
+                //        streamHandle);
+            }
             reply->writeInt32(streamHandle);
             configuration.writeToParcel(reply);
             return NO_ERROR;
diff --git a/media/libaaudio/src/client/AudioStreamInternal.cpp b/media/libaaudio/src/client/AudioStreamInternal.cpp
index 7b01e44..8b14922 100644
--- a/media/libaaudio/src/client/AudioStreamInternal.cpp
+++ b/media/libaaudio/src/client/AudioStreamInternal.cpp
@@ -86,7 +86,7 @@
         setFormat(AAUDIO_FORMAT_PCM_FLOAT);
     }
     // Request FLOAT for the shared mixer.
-    request.getConfiguration().setAudioFormat(AAUDIO_FORMAT_PCM_FLOAT);
+    request.getConfiguration().setFormat(AAUDIO_FORMAT_PCM_FLOAT);
 
     // Build the request to send to the server.
     request.setUserId(getuid());
@@ -119,7 +119,7 @@
         setSharingMode(configuration.getSharingMode());
 
         // Save device format so we can do format conversion and volume scaling together.
-        mDeviceFormat = configuration.getAudioFormat();
+        mDeviceFormat = configuration.getFormat();
 
         result = mServiceInterface.getStreamDescription(mServiceStreamHandle, mEndPointParcelable);
         if (result != AAUDIO_OK) {
diff --git a/media/libaaudio/src/core/AAudioStreamParameters.cpp b/media/libaaudio/src/core/AAudioStreamParameters.cpp
new file mode 100644
index 0000000..65c2b46
--- /dev/null
+++ b/media/libaaudio/src/core/AAudioStreamParameters.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#define LOG_TAG "AAudio"
+#include <utils/Log.h>
+#include <hardware/audio.h>
+
+#include "AAudioStreamParameters.h"
+
+using namespace aaudio;
+
+// TODO These defines should be moved to a central place in audio.
+#define SAMPLES_PER_FRAME_MIN        1
+// TODO Remove 8 channel limitation.
+#define SAMPLES_PER_FRAME_MAX        FCC_8
+#define SAMPLE_RATE_HZ_MIN           8000
+// HDMI supports up to 32 channels at 1536000 Hz.
+#define SAMPLE_RATE_HZ_MAX           1600000
+
+AAudioStreamParameters::AAudioStreamParameters() {}
+AAudioStreamParameters::~AAudioStreamParameters() {}
+
+aaudio_result_t AAudioStreamParameters::validate() const {
+    if (mSamplesPerFrame != AAUDIO_UNSPECIFIED
+        && (mSamplesPerFrame < SAMPLES_PER_FRAME_MIN || mSamplesPerFrame > SAMPLES_PER_FRAME_MAX)) {
+        ALOGE("AAudioStreamParameters: channelCount out of range = %d", mSamplesPerFrame);
+        return AAUDIO_ERROR_OUT_OF_RANGE;
+    }
+
+    if (mDeviceId < 0) {
+        ALOGE("AAudioStreamParameters: deviceId out of range = %d", mDeviceId);
+        return AAUDIO_ERROR_OUT_OF_RANGE;
+    }
+
+    switch (mSharingMode) {
+        case AAUDIO_SHARING_MODE_EXCLUSIVE:
+        case AAUDIO_SHARING_MODE_SHARED:
+            break;
+        default:
+            ALOGE("AAudioStreamParameters: illegal sharingMode = %d", mSharingMode);
+            return AAUDIO_ERROR_ILLEGAL_ARGUMENT;
+            // break;
+    }
+
+    switch (mAudioFormat) {
+        case AAUDIO_FORMAT_UNSPECIFIED:
+        case AAUDIO_FORMAT_PCM_I16:
+        case AAUDIO_FORMAT_PCM_FLOAT:
+            break; // valid
+        default:
+            ALOGE("AAudioStreamParameters: audioFormat not valid = %d", mAudioFormat);
+            return AAUDIO_ERROR_INVALID_FORMAT;
+            // break;
+    }
+
+    if (mSampleRate != AAUDIO_UNSPECIFIED
+        && (mSampleRate < SAMPLE_RATE_HZ_MIN || mSampleRate > SAMPLE_RATE_HZ_MAX)) {
+        ALOGE("AAudioStreamParameters: sampleRate out of range = %d", mSampleRate);
+        return AAUDIO_ERROR_INVALID_RATE;
+    }
+
+    if (mBufferCapacity < 0) {
+        ALOGE("AAudioStreamParameters: bufferCapacity out of range = %d", mBufferCapacity);
+        return AAUDIO_ERROR_OUT_OF_RANGE;
+    }
+
+    return AAUDIO_OK;
+}
+
+void AAudioStreamParameters::dump() const {
+    ALOGD("AAudioStreamParameters mDeviceId        = %d", mDeviceId);
+    ALOGD("AAudioStreamParameters mSampleRate      = %d", mSampleRate);
+    ALOGD("AAudioStreamParameters mSamplesPerFrame = %d", mSamplesPerFrame);
+    ALOGD("AAudioStreamParameters mSharingMode     = %d", (int)mSharingMode);
+    ALOGD("AAudioStreamParameters mAudioFormat     = %d", (int)mAudioFormat);
+    ALOGD("AAudioStreamParameters mBufferCapacity  = %d", mBufferCapacity);
+}
\ No newline at end of file
diff --git a/media/libaaudio/src/core/AAudioStreamParameters.h b/media/libaaudio/src/core/AAudioStreamParameters.h
new file mode 100644
index 0000000..97379cc
--- /dev/null
+++ b/media/libaaudio/src/core/AAudioStreamParameters.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AAUDIO_STREAM_PARAMETERS_H
+#define AAUDIO_STREAM_PARAMETERS_H
+
+#include <stdint.h>
+
+#include <aaudio/AAudio.h>
+
+namespace aaudio {
+
+class AAudioStreamParameters {
+public:
+    AAudioStreamParameters();
+    virtual ~AAudioStreamParameters();
+
+    int32_t getDeviceId() const {
+        return mDeviceId;
+    }
+
+    void setDeviceId(int32_t deviceId) {
+        mDeviceId = deviceId;
+    }
+
+    int32_t getSampleRate() const {
+        return mSampleRate;
+    }
+
+    void setSampleRate(int32_t sampleRate) {
+        mSampleRate = sampleRate;
+    }
+
+    int32_t getSamplesPerFrame() const {
+        return mSamplesPerFrame;
+    }
+
+    /**
+     * This is also known as channelCount.
+     */
+    void setSamplesPerFrame(int32_t samplesPerFrame) {
+        mSamplesPerFrame = samplesPerFrame;
+    }
+
+    aaudio_format_t getFormat() const {
+        return mAudioFormat;
+    }
+
+    void setFormat(aaudio_format_t audioFormat) {
+        mAudioFormat = audioFormat;
+    }
+
+    aaudio_sharing_mode_t getSharingMode() const {
+        return mSharingMode;
+    }
+
+    void setSharingMode(aaudio_sharing_mode_t sharingMode) {
+        mSharingMode = sharingMode;
+    }
+
+    int32_t getBufferCapacity() const {
+        return mBufferCapacity;
+    }
+
+    void setBufferCapacity(int32_t frames) {
+        mBufferCapacity = frames;
+    }
+
+    virtual aaudio_result_t validate() const;
+
+    void dump() const;
+
+private:
+    int32_t                    mSamplesPerFrame = AAUDIO_UNSPECIFIED;
+    int32_t                    mSampleRate      = AAUDIO_UNSPECIFIED;
+    int32_t                    mDeviceId        = AAUDIO_UNSPECIFIED;
+    aaudio_sharing_mode_t      mSharingMode     = AAUDIO_SHARING_MODE_SHARED;
+    aaudio_format_t            mAudioFormat     = AAUDIO_FORMAT_UNSPECIFIED;
+    int32_t                    mBufferCapacity  = AAUDIO_UNSPECIFIED;
+};
+
+} /* namespace aaudio */
+
+#endif //AAUDIO_STREAM_PARAMETERS_H
\ No newline at end of file
diff --git a/media/libaaudio/src/core/AudioStreamBuilder.cpp b/media/libaaudio/src/core/AudioStreamBuilder.cpp
index 6c4aa59..43a1ef1 100644
--- a/media/libaaudio/src/core/AudioStreamBuilder.cpp
+++ b/media/libaaudio/src/core/AudioStreamBuilder.cpp
@@ -179,36 +179,9 @@
 
     // Check for values that are ridiculously out of range to prevent math overflow exploits.
     // The service will do a better check.
-    if (mSamplesPerFrame != AAUDIO_UNSPECIFIED
-        && (mSamplesPerFrame < SAMPLES_PER_FRAME_MIN || mSamplesPerFrame > SAMPLES_PER_FRAME_MAX)) {
-        ALOGE("AudioStreamBuilder: channelCount out of range = %d", mSamplesPerFrame);
-        return AAUDIO_ERROR_OUT_OF_RANGE;
-    }
-
-    if (mDeviceId < 0) {
-        ALOGE("AudioStreamBuilder: deviceId out of range = %d", mDeviceId);
-        return AAUDIO_ERROR_OUT_OF_RANGE;
-    }
-
-    switch (mSharingMode) {
-        case AAUDIO_SHARING_MODE_EXCLUSIVE:
-        case AAUDIO_SHARING_MODE_SHARED:
-            break;
-        default:
-            ALOGE("AudioStreamBuilder: illegal sharingMode = %d", mSharingMode);
-            return AAUDIO_ERROR_ILLEGAL_ARGUMENT;
-            // break;
-    }
-
-    switch (mFormat) {
-        case AAUDIO_FORMAT_UNSPECIFIED:
-        case AAUDIO_FORMAT_PCM_I16:
-        case AAUDIO_FORMAT_PCM_FLOAT:
-            break; // valid
-        default:
-            ALOGE("AudioStreamBuilder: audioFormat not valid = %d", mFormat);
-            return AAUDIO_ERROR_INVALID_FORMAT;
-            // break;
+    aaudio_result_t result = AAudioStreamParameters::validate();
+    if (result != AAUDIO_OK) {
+        return result;
     }
 
     switch (mDirection) {
@@ -221,17 +194,6 @@
             // break;
     }
 
-    if (mSampleRate != AAUDIO_UNSPECIFIED
-        && (mSampleRate < SAMPLE_RATE_HZ_MIN || mSampleRate > SAMPLE_RATE_HZ_MAX)) {
-        ALOGE("AudioStreamBuilder: sampleRate out of range = %d", mSampleRate);
-        return AAUDIO_ERROR_INVALID_RATE;
-    }
-
-    if (mBufferCapacity < 0) {
-        ALOGE("AudioStreamBuilder: bufferCapacity out of range = %d", mBufferCapacity);
-        return AAUDIO_ERROR_OUT_OF_RANGE;
-    }
-
     switch (mPerformanceMode) {
         case AAUDIO_PERFORMANCE_MODE_NONE:
         case AAUDIO_PERFORMANCE_MODE_POWER_SAVING:
diff --git a/media/libaaudio/src/core/AudioStreamBuilder.h b/media/libaaudio/src/core/AudioStreamBuilder.h
index d757592..6e548b1 100644
--- a/media/libaaudio/src/core/AudioStreamBuilder.h
+++ b/media/libaaudio/src/core/AudioStreamBuilder.h
@@ -21,6 +21,7 @@
 
 #include <aaudio/AAudio.h>
 
+#include "AAudioStreamParameters.h"
 #include "AudioStream.h"
 
 namespace aaudio {
@@ -28,24 +29,12 @@
 /**
  * Factory class for an AudioStream.
  */
-class AudioStreamBuilder {
+class AudioStreamBuilder : public AAudioStreamParameters {
 public:
     AudioStreamBuilder();
 
     ~AudioStreamBuilder();
 
-    int getSamplesPerFrame() const {
-        return mSamplesPerFrame;
-    }
-
-    /**
-     * This is also known as channelCount.
-     */
-    AudioStreamBuilder* setSamplesPerFrame(int samplesPerFrame) {
-        mSamplesPerFrame = samplesPerFrame;
-        return this;
-    }
-
     aaudio_direction_t getDirection() const {
         return mDirection;
     }
@@ -55,33 +44,6 @@
         return this;
     }
 
-    int32_t getSampleRate() const {
-        return mSampleRate;
-    }
-
-    AudioStreamBuilder* setSampleRate(int32_t sampleRate) {
-        mSampleRate = sampleRate;
-        return this;
-    }
-
-    aaudio_format_t getFormat() const {
-        return mFormat;
-    }
-
-    AudioStreamBuilder *setFormat(aaudio_format_t format) {
-        mFormat = format;
-        return this;
-    }
-
-    aaudio_sharing_mode_t getSharingMode() const {
-        return mSharingMode;
-    }
-
-    AudioStreamBuilder* setSharingMode(aaudio_sharing_mode_t sharingMode) {
-        mSharingMode = sharingMode;
-        return this;
-    }
-
     bool isSharingModeMatchRequired() const {
         return mSharingModeMatchRequired;
     }
@@ -91,15 +53,6 @@
         return this;
     }
 
-    int32_t getBufferCapacity() const {
-        return mBufferCapacity;
-    }
-
-    AudioStreamBuilder* setBufferCapacity(int32_t frames) {
-        mBufferCapacity = frames;
-        return this;
-    }
-
     int32_t getPerformanceMode() const {
         return mPerformanceMode;
     }
@@ -109,15 +62,6 @@
         return this;
     }
 
-    int32_t getDeviceId() const {
-        return mDeviceId;
-    }
-
-    AudioStreamBuilder* setDeviceId(int32_t deviceId) {
-        mDeviceId = deviceId;
-        return this;
-    }
-
     AAudioStream_dataCallback getDataCallbackProc() const {
         return mDataCallbackProc;
     }
@@ -165,17 +109,11 @@
 
     aaudio_result_t build(AudioStream **streamPtr);
 
-    aaudio_result_t validate() const;
+    virtual aaudio_result_t validate() const override;
 
 private:
-    int32_t                    mSamplesPerFrame = AAUDIO_UNSPECIFIED;
-    int32_t                    mSampleRate = AAUDIO_UNSPECIFIED;
-    int32_t                    mDeviceId = AAUDIO_UNSPECIFIED;
-    aaudio_sharing_mode_t      mSharingMode = AAUDIO_SHARING_MODE_SHARED;
     bool                       mSharingModeMatchRequired = false; // must match sharing mode requested
-    aaudio_format_t            mFormat = AAUDIO_FORMAT_UNSPECIFIED;
     aaudio_direction_t         mDirection = AAUDIO_DIRECTION_OUTPUT;
-    int32_t                    mBufferCapacity = AAUDIO_UNSPECIFIED;
     aaudio_performance_mode_t  mPerformanceMode = AAUDIO_PERFORMANCE_MODE_NONE;
 
     AAudioStream_dataCallback  mDataCallbackProc = nullptr;  // external callback functions