diff --git a/media/libmediahelper/AudioParameter.cpp b/media/libmediahelper/AudioParameter.cpp
index 382a920..9a8156e 100644
--- a/media/libmediahelper/AudioParameter.cpp
+++ b/media/libmediahelper/AudioParameter.cpp
@@ -61,6 +61,12 @@
         AUDIO_PARAMETER_DEVICE_ADDITIONAL_OUTPUT_DELAY;
 const char * const AudioParameter::keyMaxAdditionalOutputDeviceDelay =
         AUDIO_PARAMETER_DEVICE_MAX_ADDITIONAL_OUTPUT_DELAY;
+const char * const AudioParameter::keyOffloadCodecAverageBitRate = AUDIO_OFFLOAD_CODEC_AVG_BIT_RATE;
+const char * const AudioParameter::keyOffloadCodecSampleRate = AUDIO_OFFLOAD_CODEC_SAMPLE_RATE;
+const char * const AudioParameter::keyOffloadCodecChannels = AUDIO_OFFLOAD_CODEC_NUM_CHANNEL;
+const char * const AudioParameter::keyOffloadCodecDelaySamples = AUDIO_OFFLOAD_CODEC_DELAY_SAMPLES;
+const char * const AudioParameter::keyOffloadCodecPaddingSamples =
+        AUDIO_OFFLOAD_CODEC_PADDING_SAMPLES;
 
 AudioParameter::AudioParameter(const String8& keyValuePairs)
 {
@@ -226,4 +232,9 @@
     }
 }
 
+bool AudioParameter::containsKey(const String8& key) const
+{
+    return mParameters.indexOfKey(key) >= 0;
+}
+
 } // namespace android