diff --git a/services/audioflinger/SourceAudioBufferProvider.h b/services/audioflinger/SourceAudioBufferProvider.h
index 3219d78..85ccbb2 100644
--- a/services/audioflinger/SourceAudioBufferProvider.h
+++ b/services/audioflinger/SourceAudioBufferProvider.h
@@ -20,11 +20,11 @@
 #define ANDROID_SOURCE_AUDIO_BUFFER_PROVIDER_H
 
 #include "NBAIO.h"
-#include "AudioBufferProvider.h"
+#include "ExtendedAudioBufferProvider.h"
 
 namespace android {
 
-class SourceAudioBufferProvider : public AudioBufferProvider {
+class SourceAudioBufferProvider : public ExtendedAudioBufferProvider {
 
 public:
     SourceAudioBufferProvider(const sp<NBAIO_Source>& source);
@@ -34,6 +34,9 @@
     virtual status_t getNextBuffer(Buffer *buffer, int64_t pts);
     virtual void     releaseBuffer(Buffer *buffer);
 
+    // ExtendedAudioBufferProvider interface
+    virtual size_t   framesReady() const;
+
 private:
     const sp<NBAIO_Source> mSource;     // the wrapped source
     /*const*/ size_t    mFrameBitShift; // log2(frame size in bytes)