diff --git a/include/media/AudioRecord.h b/include/media/AudioRecord.h
index 2672db1..cd7ff92 100644
--- a/include/media/AudioRecord.h
+++ b/include/media/AudioRecord.h
@@ -95,7 +95,7 @@
      *  - BAD_VALUE: unsupported configuration
      */
 
-     static status_t getMinFrameCount(int* frameCount,
+     static status_t getMinFrameCount(size_t* frameCount,
                                       uint32_t sampleRate,
                                       audio_format_t format,
                                       audio_channel_mask_t channelMask);
@@ -184,7 +184,7 @@
 
             audio_format_t format() const;
             int         channelCount() const;
-            uint32_t    frameCount() const;
+            size_t      frameCount() const;
             size_t      frameSize() const { return mFrameSize; }
             audio_source_t inputSource() const;
 
@@ -352,7 +352,7 @@
             status_t openRecord_l(uint32_t sampleRate,
                                 audio_format_t format,
                                 audio_channel_mask_t channelMask,
-                                int frameCount,
+                                size_t frameCount,
                                 audio_io_handle_t input);
             audio_io_handle_t getInput_l();
             status_t restoreRecord_l(audio_track_cblk_t*& cblk);
@@ -375,7 +375,7 @@
     uint32_t                mUpdatePeriod;      // in ms
 
     // constant after constructor or set()
-    uint32_t                mFrameCount;
+    size_t                  mFrameCount;
     audio_format_t          mFormat;
     uint8_t                 mChannelCount;
     size_t                  mFrameSize;         // app-level frame size == AudioFlinger frame size
diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 33078bb..126ef12 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -89,7 +89,7 @@
 
     static status_t getOutputSamplingRate(uint32_t* samplingRate,
             audio_stream_type_t stream = AUDIO_STREAM_DEFAULT);
-    static status_t getOutputFrameCount(int* frameCount,
+    static status_t getOutputFrameCount(size_t* frameCount,
             audio_stream_type_t stream = AUDIO_STREAM_DEFAULT);
     static status_t getOutputLatency(uint32_t* latency,
             audio_stream_type_t stream = AUDIO_STREAM_DEFAULT);
@@ -100,7 +100,7 @@
     // audio_stream->get_buffer_size()/audio_stream_frame_size()
     static status_t getFrameCount(audio_io_handle_t output,
                                   audio_stream_type_t stream,
-                                  int* frameCount);
+                                  size_t* frameCount);
     // returns the audio output stream latency in ms. Corresponds to
     // audio_stream_out->get_latency()
     static status_t getLatency(audio_io_handle_t output,
@@ -123,11 +123,11 @@
     // - BAD_VALUE: invalid parameter
     // NOTE: this feature is not supported on all hardware platforms and it is
     // necessary to check returned status before using the returned values.
-    static status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames,
+    static status_t getRenderPosition(size_t *halFrames, size_t *dspFrames,
             audio_stream_type_t stream = AUDIO_STREAM_DEFAULT);
 
     // return the number of input frames lost by HAL implementation, or 0 if the handle is invalid
-    static unsigned int  getInputFramesLost(audio_io_handle_t ioHandle);
+    static size_t getInputFramesLost(audio_io_handle_t ioHandle);
 
     static int newAudioSessionId();
     static void acquireAudioSessionId(int audioSession);
@@ -238,7 +238,7 @@
 
     // helpers for android.media.AudioManager.getProperty(), see description there for meaning
     static uint32_t getPrimaryOutputSamplingRate();
-    static int32_t getPrimaryOutputFrameCount();
+    static size_t getPrimaryOutputFrameCount();
 
     // ----------------------------------------------------------------------------
 
diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index 6fd1b9e..f1b26b5 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -110,7 +110,7 @@
      *  - NO_INIT: audio server or audio hardware not initialized
      */
 
-     static status_t getMinFrameCount(int* frameCount,
+     static status_t getMinFrameCount(size_t* frameCount,
                                       audio_stream_type_t streamType = AUDIO_STREAM_DEFAULT,
                                       uint32_t sampleRate = 0);
 
@@ -494,7 +494,7 @@
                                  uint32_t sampleRate,
                                  audio_format_t format,
                                  audio_channel_mask_t channelMask,
-                                 int frameCount,
+                                 size_t frameCount,
                                  audio_output_flags_t flags,
                                  const sp<IMemory>& sharedBuffer,
                                  audio_io_handle_t output);
diff --git a/include/media/IAudioFlinger.h b/include/media/IAudioFlinger.h
index 5fd5044..9727143 100644
--- a/include/media/IAudioFlinger.h
+++ b/include/media/IAudioFlinger.h
@@ -61,7 +61,7 @@
                                 uint32_t sampleRate,
                                 audio_format_t format,
                                 audio_channel_mask_t channelMask,
-                                int frameCount,
+                                size_t frameCount,
                                 track_flags_t *flags,
                                 const sp<IMemory>& sharedBuffer,
                                 audio_io_handle_t output,
@@ -75,7 +75,7 @@
                                 uint32_t sampleRate,
                                 audio_format_t format,
                                 audio_channel_mask_t channelMask,
-                                int frameCount,
+                                size_t frameCount,
                                 track_flags_t flags,
                                 pid_t tid,  // -1 means unused, otherwise must be valid non-0
                                 int *sessionId,
@@ -157,10 +157,10 @@
 
     virtual status_t setVoiceVolume(float volume) = 0;
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames,
+    virtual status_t getRenderPosition(size_t *halFrames, size_t *dspFrames,
                                     audio_io_handle_t output) const = 0;
 
-    virtual unsigned int getInputFramesLost(audio_io_handle_t ioHandle) const = 0;
+    virtual size_t getInputFramesLost(audio_io_handle_t ioHandle) const = 0;
 
     virtual int newAudioSessionId() = 0;
 
@@ -193,7 +193,7 @@
     // FIXME move these APIs to AudioPolicy to permit a more accurate implementation
     // that looks on primary device for a stream with fast flag, primary flag, or first one.
     virtual uint32_t getPrimaryOutputSamplingRate() = 0;
-    virtual int32_t getPrimaryOutputFrameCount() = 0;
+    virtual size_t getPrimaryOutputFrameCount() = 0;
 
 };