diff --git a/media/libaaudio/examples/utils/AAudioArgsParser.h b/media/libaaudio/examples/utils/AAudioArgsParser.h
index 0e61589..ece9e6a 100644
--- a/media/libaaudio/examples/utils/AAudioArgsParser.h
+++ b/media/libaaudio/examples/utils/AAudioArgsParser.h
@@ -185,18 +185,26 @@
         mNumberOfBursts = numBursts;
     }
 
+    int32_t getFramesPerCallback() const {
+        return mFramesPerCallback;
+    }
+    void setFramesPerCallback(int32_t size) {
+        mFramesPerCallback = size;
+    }
+
     /**
      * Apply these parameters to a stream builder.
      * @param builder
      */
     void applyParameters(AAudioStreamBuilder *builder) const {
-        AAudioStreamBuilder_setChannelCount(builder, mChannelCount);
-        AAudioStreamBuilder_setFormat(builder, mFormat);
-        AAudioStreamBuilder_setSampleRate(builder, mSampleRate);
         AAudioStreamBuilder_setBufferCapacityInFrames(builder, mBufferCapacity);
+        AAudioStreamBuilder_setChannelCount(builder, mChannelCount);
         AAudioStreamBuilder_setDeviceId(builder, mDeviceId);
-        AAudioStreamBuilder_setSharingMode(builder, mSharingMode);
+        AAudioStreamBuilder_setFormat(builder, mFormat);
+        AAudioStreamBuilder_setFramesPerDataCallback(builder, mFramesPerCallback);
         AAudioStreamBuilder_setPerformanceMode(builder, mPerformanceMode);
+        AAudioStreamBuilder_setSampleRate(builder, mSampleRate);
+        AAudioStreamBuilder_setSharingMode(builder, mSharingMode);
 
         // Call P functions if supported.
         loadFutureFunctions();
@@ -232,6 +240,7 @@
     aaudio_input_preset_t      mInputPreset     = AAUDIO_UNSPECIFIED;
 
     int32_t                    mNumberOfBursts  = AAUDIO_UNSPECIFIED;
+    int32_t                    mFramesPerCallback = AAUDIO_UNSPECIFIED;
 };
 
 class AAudioArgsParser : public AAudioParameters {
@@ -297,6 +306,9 @@
                 case 'y':
                     setContentType(atoi(&arg[2]));
                     break;
+                case 'z':
+                    setFramesPerCallback(atoi(&arg[2]));
+                    break;
                 default:
                     unrecognized = true;
                     break;
@@ -350,6 +362,7 @@
         printf("      -u{usage} eg. 14 for AAUDIO_USAGE_GAME\n");
         printf("      -x to use EXCLUSIVE mode\n");
         printf("      -y{contentType} eg. 1 for AAUDIO_CONTENT_TYPE_SPEECH\n");
+        printf("      -z{callbackSize} or block size, in frames, default = 0\n");
     }
 
     static aaudio_performance_mode_t parsePerformanceMode(char c) {
@@ -406,6 +419,9 @@
         printf("  Capacity:     requested = %d, actual = %d\n", getBufferCapacity(),
                AAudioStream_getBufferCapacityInFrames(stream));
 
+        printf("  CallbackSize: requested = %d, actual = %d\n", getFramesPerCallback(),
+               AAudioStream_getFramesPerDataCallback(stream));
+
         printf("  SharingMode:  requested = %s, actual = %s\n",
                getSharingModeText(getSharingMode()),
                getSharingModeText(AAudioStream_getSharingMode(stream)));