diff --git a/media/libmedia/IAudioFlinger.cpp b/media/libmedia/IAudioFlinger.cpp
index e8dd438..27f6b45 100644
--- a/media/libmedia/IAudioFlinger.cpp
+++ b/media/libmedia/IAudioFlinger.cpp
@@ -32,7 +32,7 @@
     CREATE_TRACK = IBinder::FIRST_CALL_TRANSACTION,
     OPEN_RECORD,
     SAMPLE_RATE,
-    CHANNEL_COUNT,
+    CHANNEL_COUNT,  // obsolete
     FORMAT,
     FRAME_COUNT,
     LATENCY,
@@ -86,7 +86,7 @@
                                 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,
@@ -182,6 +182,7 @@
         return reply.readInt32();
     }
 
+#if 0
     virtual int channelCount(audio_io_handle_t output) const
     {
         Parcel data, reply;
@@ -190,6 +191,7 @@
         remote()->transact(CHANNEL_COUNT, data, &reply);
         return reply.readInt32();
     }
+#endif
 
     virtual audio_format_t format(audio_io_handle_t output) const
     {
@@ -347,13 +349,14 @@
         remote()->transact(REGISTER_CLIENT, data, &reply);
     }
 
-    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) const
+    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format,
+            audio_channel_mask_t channelMask) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32(sampleRate);
         data.writeInt32(format);
-        data.writeInt32(channelCount);
+        data.writeInt32(channelMask);
         remote()->transact(GET_INPUTBUFFERSIZE, data, &reply);
         return reply.readInt32();
     }
@@ -698,7 +701,7 @@
             int streamType = data.readInt32();
             uint32_t sampleRate = data.readInt32();
             audio_format_t format = (audio_format_t) data.readInt32();
-            int channelCount = data.readInt32();
+            audio_channel_mask_t channelMask = data.readInt32();
             size_t bufferCount = data.readInt32();
             track_flags_t flags = (track_flags_t) data.readInt32();
             sp<IMemory> buffer = interface_cast<IMemory>(data.readStrongBinder());
@@ -708,7 +711,7 @@
             status_t status;
             sp<IAudioTrack> track = createTrack(pid,
                     (audio_stream_type_t) streamType, sampleRate, format,
-                    channelCount, bufferCount, flags, buffer, output, tid, &sessionId, &status);
+                    channelMask, bufferCount, flags, buffer, output, tid, &sessionId, &status);
             reply->writeInt32(sessionId);
             reply->writeInt32(status);
             reply->writeStrongBinder(track->asBinder());
@@ -720,13 +723,13 @@
             audio_io_handle_t input = (audio_io_handle_t) data.readInt32();
             uint32_t sampleRate = data.readInt32();
             audio_format_t format = (audio_format_t) data.readInt32();
-            int channelCount = data.readInt32();
+            audio_channel_mask_t channelMask = data.readInt32();
             size_t bufferCount = data.readInt32();
             track_flags_t flags = (track_flags_t) data.readInt32();
             int sessionId = data.readInt32();
             status_t status;
             sp<IAudioRecord> record = openRecord(pid, input,
-                    sampleRate, format, channelCount, bufferCount, flags, &sessionId, &status);
+                    sampleRate, format, channelMask, bufferCount, flags, &sessionId, &status);
             reply->writeInt32(sessionId);
             reply->writeInt32(status);
             reply->writeStrongBinder(record->asBinder());
@@ -737,11 +740,13 @@
             reply->writeInt32( sampleRate((audio_io_handle_t) data.readInt32()) );
             return NO_ERROR;
         } break;
+#if 0
         case CHANNEL_COUNT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
             reply->writeInt32( channelCount((audio_io_handle_t) data.readInt32()) );
             return NO_ERROR;
         } break;
+#endif
         case FORMAT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
             reply->writeInt32( format((audio_io_handle_t) data.readInt32()) );
@@ -846,8 +851,8 @@
             CHECK_INTERFACE(IAudioFlinger, data, reply);
             uint32_t sampleRate = data.readInt32();
             audio_format_t format = (audio_format_t) data.readInt32();
-            int channelCount = data.readInt32();
-            reply->writeInt32( getInputBufferSize(sampleRate, format, channelCount) );
+            audio_channel_mask_t channelMask = data.readInt32();
+            reply->writeInt32( getInputBufferSize(sampleRate, format, channelMask) );
             return NO_ERROR;
         } break;
         case OPEN_OUTPUT: {