diff --git a/include/media/AudioRecord.h b/include/media/AudioRecord.h
index 56be107..813ea85 100644
--- a/include/media/AudioRecord.h
+++ b/include/media/AudioRecord.h
@@ -107,7 +107,7 @@
      static status_t getMinFrameCount(int* frameCount,
                                       uint32_t sampleRate,
                                       audio_format_t format,
-                                      int channelCount);
+                                      audio_channel_mask_t channelMask);
 
     /* Constructs an uninitialized AudioRecord. No connection with
      * AudioFlinger takes place.
diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 0662244..18c9c92 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -110,8 +110,8 @@
 
     static bool routedToA2dpOutput(audio_stream_type_t streamType);
 
-    static status_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount,
-        size_t* buffSize);
+    static status_t getInputBufferSize(uint32_t sampleRate, audio_format_t format,
+        audio_channel_mask_t channelMask, size_t* buffSize);
 
     static status_t setVoiceVolume(float volume);
 
@@ -276,7 +276,7 @@
     // previous parameters for recording buffer size queries
     static uint32_t gPrevInSamplingRate;
     static audio_format_t gPrevInFormat;
-    static int gPrevInChannelCount;
+    static audio_channel_mask_t gPrevInChannelMask;
 
     static sp<IAudioPolicyService> gAudioPolicyService;
 
diff --git a/include/media/IAudioFlinger.h b/include/media/IAudioFlinger.h
index 86e228b..5d95b3b 100644
--- a/include/media/IAudioFlinger.h
+++ b/include/media/IAudioFlinger.h
@@ -60,7 +60,7 @@
                                 audio_stream_type_t streamType,
                                 uint32_t sampleRate,
                                 audio_format_t format,
-                                uint32_t channelMask,
+                                audio_channel_mask_t channelMask,
                                 int frameCount,
                                 track_flags_t flags,
                                 const sp<IMemory>& sharedBuffer,
@@ -74,7 +74,7 @@
                                 audio_io_handle_t input,
                                 uint32_t sampleRate,
                                 audio_format_t format,
-                                uint32_t channelMask,
+                                audio_channel_mask_t channelMask,
                                 int frameCount,
                                 track_flags_t flags,
                                 int *sessionId,
@@ -84,7 +84,9 @@
      * and therefore can be cached.
      */
     virtual     uint32_t    sampleRate(audio_io_handle_t output) const = 0;
+#if 0
     virtual     int         channelCount(audio_io_handle_t output) const = 0;
+#endif
     virtual     audio_format_t format(audio_io_handle_t output) const = 0;
     virtual     size_t      frameCount(audio_io_handle_t output) const = 0;
 
@@ -126,7 +128,8 @@
     virtual void registerClient(const sp<IAudioFlingerClient>& client) = 0;
 
     // retrieve the audio recording buffer size
-    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) const = 0;
+    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format,
+            audio_channel_mask_t channelMask) const = 0;
 
     virtual audio_io_handle_t openOutput(audio_module_handle_t module,
                                          audio_devices_t *pDevices,